Merge branch 'master' of gitlab2.rz.ifi.lmu.de:uni2work/uni2work

2020-01-14 11:11:35 +01:00 · 2020-01-14 11:11:35 +01:00 · e4393972f8
commit e4393972f8
parent bd3cfaefd6 555c4aebeb
61 changed files with 1837 additions and 305 deletions
--- a/.gitignore
+++ b/.gitignore
@ -35,5 +35,7 @@ test.log
 /.stack-work.lock
 /.npmrc
 /config/webpack.yml
-static/wp-*/
 tunnel.log
+/static
+/well-known
+/**/tmp-*
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@ -33,10 +33,13 @@ npm install:
    - n stable
    - npm install -g npm
    - hash -r
-    - apt-get install openssh-client -y
+    - apt-get -y install openssh-client exiftool
    - install -v -m 0700 -d ~/.ssh
    - install -v -T -m 0644 ${SSH_KNOWN_HOSTS} ~/.ssh/known_hosts
    - install -v -T -m 0400 ${SSH_DEPLOY_KEY} ~/.ssh/deploy && echo "IdentityFile ~/.ssh/deploy" >> ~/.ssh/config; 
+  after_script:
+    - zip -qr node_modules.zip node_modules
+    - du -hs node_modules node_modules.zip
  artifacts:
    paths:
      - node_modules/
@ -54,6 +57,7 @@ frontend:build:
  artifacts:
    paths:
      - static
+      - well-known
      - config/webpack.yml
    name: "${CI_JOB_NAME}"
    expire_in: "1 day"
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@ -2,6 +2,45 @@

 All notable changes to this project will be documented in this file. See [standard-version](https://github.com/conventional-changelog/standard-version) for commit guidelines.

+## [10.3.0](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v10.2.0...v10.3.0) (2020-01-12)
+
+
+### Bug Fixes
+
+* fix app frontend test ([49bafe1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/49bafe1))
+* improve exam occurrence ui ([83fa9c9](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/83fa9c9))
+* improve labeling of button to switch exam occurrence ([727b89b](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/727b89b))
+* tweak debouncing & canceling ([6b51cc5](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/6b51cc5))
+* **async-table:** bind callback in updateTableFrom call ([cd3e72c](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/cd3e72c))
+* **util-registry:** fix initAll and tests ([2620fb2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/2620fb2))
+* **util-registry:** start setup instances and not all active instances ([ddf94bf](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/ddf94bf))
+
+
+### Features
+
+* support exam registration including room (ExamRoomFifo) ([14bb020](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/14bb020))
+* well known files ([068632b](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/068632b))
+* **async-table:** no submit on locked inputs ([22b3780](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/22b3780))
+* **frontend:** split up util registry ([67e472f](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/67e472f))
+* **util-registry:** more debug info for setup util instances ([00584f9](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/00584f9))
+
+
+
+## [10.2.0](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v10.1.0...v10.2.0) (2020-01-07)
+
+
+### Bug Fixes
+
+* divide by zero ([674b949](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/674b949))
+
+
+### Features
+
+* generate & include new favicon ([b78c484](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/b78c484))
+* **config:** improve configurability of VerpMode ([a7c3fe7](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/a7c3fe7))
+
+
+
 ## [10.1.0](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v10.0.1...v10.1.0) (2019-12-23)


--- a/assets/favicon.svg
+++ b/assets/favicon.svg
@ -0,0 +1,29 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   id="svg4"
+   version="1.1"
+   viewBox="0 0 576 512">
+  <metadata
+     id="metadata10">
+    <rdf:RDF>
+      <cc:Work
+         rdf:about="">
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type
+           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+        <dc:title></dc:title>
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
+  <defs
+     id="defs8" />
+  <path
+     style="stroke-width:0.89999998;fill:#0a9342;fill-opacity:1"
+     id="path2"
+     d="m 516.7975,54.444679 c -49.32,2.799 -147.348,12.987 -207.864,50.031001 -4.176,2.556 -6.543,7.101 -6.543,11.853 v 327.483 c 0,10.395 11.367,16.965 20.952,12.141 62.262,-31.338 152.307,-39.888 196.83,-42.228 15.201,-0.801 27.018,-12.987 27.018,-27.594 V 82.074679 c 0.009,-15.939 -13.815,-28.566 -30.393,-27.63 z M 267.0565,104.47568 C 206.5495,67.431679 108.5215,57.252679 59.2015,54.444679 c -16.578,-0.936 -30.402,11.691 -30.402,27.63 V 386.13968 c 0,14.616 11.817,26.802 27.018,27.594 44.541,2.34 134.631,10.899 196.893,42.255 9.558,4.815 20.889,-1.746 20.889,-12.114 v -327.708 c 0,-4.761 -2.358,-9.126 -6.543,-11.691 z" />
+</svg>
--- a/config/favicon.json
+++ b/config/favicon.json
@ -0,0 +1,77 @@
+{
+  "masterPicture": "assets/favicon.svg",
+  "design": {
+    "desktop_browser": {},
+    "ios": {
+      "picture_aspect": "background_and_margin",
+      "margin": "5%",
+      "background_color": "#ffffff",
+      "startup_image": {
+        "background_color": "#ffffff"
+      },
+      "app_name": "Uni2work",
+      "assets": {
+	"ios6_and_prior_icons": false,
+	"ios7_and_later_icons": true,
+	"precomposed_icons": true,
+	"declare_only_default_icon": true
+      }
+    },
+    "windows": {
+      "picture_aspect": "white_silhouette",
+      "background_color": "#0a9342",
+      "app_name": "Uni2work"
+    },
+    "firefox_app": {
+      "picture_aspect": "circle",
+      "keep_picture_in_circle": false,
+      "circle_inner_margin": "5%",
+      "background_color": "#ffffff",
+      "overlay": false,
+      "manifest": {
+        "app_name": "Uni2work",
+        "app_description": {
+          "_i18n": true,
+          "de-de-formal": "Ein webbasiertes Lehrverwaltungssystem der LMU München",
+          "en-eu": "A web based teaching management system at LMU Munich"
+        },
+        "developer_name": "Uni2work-Team",
+        "developer_url": "https://uni2work.ifi.lmu.de/info",
+        "display": "browser",
+        "start_url": "/"
+      }
+    },
+    "android_chrome": {
+      "picture_aspect": "shadow",
+      "manifest": {
+	"name": "Uni2work",
+	"display": "browser",
+	"orientation": "portrait",
+	"start_url": "/"
+      },
+      "assets": {
+	"legacy_icon": true,
+	"low_resolution_icons": false
+      }
+    },
+    "safari_pinned_tab": {
+      "picture_aspect": "silhouette",
+      "theme_color": "#0a9342"
+    },
+    "coast": {
+      "picture_aspect": "background_and_margin",
+      "background_color": "#ffffff",
+      "margin": "10%"
+    },
+    "open_graph": {
+      "picture_aspect": "background_and_margin",
+      "background_color": "#ffffff",
+      "margin": "10%",
+      "ratio": "square"
+    }
+  },
+  "settings": {
+    "html_code_file": true
+  },
+  "versioning": false
+}
--- a/config/mimetypes
+++ b/config/mimetypes
@ -43,6 +43,8 @@ application/java-vm class
 application/javascript js
 application/json json
 application/jsonml+json jsonml
+application/manifest+json webmanifest
+application/x-web-app-manifest+json webapp
 application/lost+xml lostxml
 application/mac-binhex40 hqx
 application/mac-compactpro cpt
--- a/config/robots.txt
+++ b/config/robots.txt
--- a/config/settings.yml
+++ b/config/settings.yml
@ -4,6 +4,9 @@
 # See https://github.com/yesodweb/yesod/wiki/Configuration#parsing-numeric-values-as-strings

 static-dir:     "_env:STATIC_DIR:static"
+well-known-dir: "_env:WELL_KNOWN_DIR:well-known"
+well-known-link-file: "html_code.html"
+
 webpack-manifest: "_env:WEBPACK_MANIFEST:config/webpack.yml"
 host:           "_env:HOST:*4" # any IPv4 host
 port:           "_env:PORT:3000"
@ -14,8 +17,8 @@ mail-from:
  email:        "_env:MAILFROM_EMAIL:uniworx@localhost"
 mail-object-domain: "_env:MAILOBJECT_DOMAIN:localhost"
 mail-verp:
-  separator:    "+"
-  at-replacement: "="
+  separator:    "_env:VERP_SEPARATOR:+"
+  at-replacement: "_env:VERP_AT_REPLACEMENT:="
 mail-support:
  name:         "_env:MAILSUPPORT_NAME:"
  email:        "_env:MAILSUPPORT:uni2work@ifi.lmu.de"
--- a/frontend/src/app.js
+++ b/frontend/src/app.js
@ -15,7 +15,7 @@ export class App {
  constructor() {
    this.utilRegistry.setApp(this);

-    document.addEventListener('DOMContentLoaded', () => this.utilRegistry.setupAll());
+    document.addEventListener('DOMContentLoaded', () => this.utilRegistry.initAll());
  }

  registerUtilities(utils) {
--- a/frontend/src/app.spec.js
+++ b/frontend/src/app.spec.js
@ -23,10 +23,10 @@ describe('App', () => {
    expect(global.App).toBeTruthy();
  });

-  it('should setup all utlites when page is done loading', () => {
-    spyOn(global.App.utilRegistry, 'setupAll');
+  it('should init all utlites when page is done loading', () => {
+    spyOn(global.App.utilRegistry, 'initAll');
    document.dispatchEvent(new Event('DOMContentLoaded'));
-    expect(global.App.utilRegistry.setupAll).toHaveBeenCalled();
+    expect(global.App.utilRegistry.initAll).toHaveBeenCalled();
  });

  describe('provides services', () => {
--- a/frontend/src/services/util-registry/util-registry.js
+++ b/frontend/src/services/util-registry/util-registry.js
@ -13,12 +13,17 @@ export class UtilRegistry {
   *   name: string | utils name, e.g. 'example'
   *   selector: string | utils selector, e.g. '[uw-example]'
   *   setup: Function | utils setup function, see below
+   * 
+   * optional util properties:
+   *   start: Function | utils start function, see below
   *
   * setup function must return instance object with at least these properties:
   *   name: string | utils name
   *   element: HTMLElement | element the util is applied to
   *   destroy: Function | function to destroy the util and remove any listeners
   *
+   * (optional) start function for registering event listeners
+   *
   * @param util Object Utility that should be added to the registry
   */
  register(util) {
@ -45,13 +50,26 @@ export class UtilRegistry {
    this._appInstance = appInstance;
  }

-  setupAll(scope) {
+  initAll(scope) {
+    let startedInstances = [];
+    const setupInstances = this._registeredUtils.map((util) => this.setup(util, scope)).flat();
+
+    setupInstances.forEach((utilInstance) => {
+      if (utilInstance) {
+        const instance = utilInstance.instance;
+        if (instance && typeof instance.start === 'function') {
+          instance.start();
+          startedInstances.push(instance);
+        }
+      }
+    });
+
    if (DEBUG_MODE > 1) {
-      console.info('registered js utilities:');
-      console.table(this._registeredUtils);
+      console.info('initialized js util instances:');
+      console.table(setupInstances);
    }

-    this._registeredUtils.forEach((util) => this.setup(util, scope));
+    return startedInstances;
  }

  setup(util, scope = document.body) {
@ -71,7 +89,7 @@ export class UtilRegistry {
          utilInstance = new util(element, this._appInstance);
        } catch(err) {
          if (DEBUG_MODE > 0) {
-            console.warn('Error while trying to initialize a utility!', { util , element, err });
+            console.error('Error while trying to initialize a utility!', { util , element, err });
          }
        }

@ -80,7 +98,7 @@ export class UtilRegistry {
            console.info('Got utility instance for utility "' + util.name + '"', { utilInstance });
          }

-          instances.push(utilInstance);
+          instances.push({ util: util, scope: scope, element: element, instance: utilInstance });
        }
      });
    }
--- a/frontend/src/services/util-registry/util-registry.spec.js
+++ b/frontend/src/services/util-registry/util-registry.spec.js
@ -97,32 +97,80 @@ describe('UtilRegistry', () => {

        const setupUtilities = utilRegistry.setup(TestUtil1, testScope);
        expect(setupUtilities).toBeTruthy();
-        expect(setupUtilities[0].app).toBe(fakeApp);
-        expect(setupUtilities[1].app).toBe(fakeApp);
+        setupUtilities.forEach((setupUtility) => {
+          expect(setupUtility).toBeTruthy();
+          expect(setupUtility.instance).toBeTruthy();
+        });
+        expect(setupUtilities[0].instance.app).toBe(fakeApp);
+        expect(setupUtilities[1].instance.app).toBe(fakeApp);
      });
    });
  });

-  describe('setupAll()', () => {
+  describe('initAll()', () => {
    it('should setup all the utilities', () => {
      spyOn(utilRegistry, 'setup');
      utilRegistry.register(TestUtil1);
      utilRegistry.register(TestUtil2);
-      utilRegistry.setupAll();
+      utilRegistry.register(TestUtil3);
+      utilRegistry.initAll();

-      expect(utilRegistry.setup.calls.count()).toBe(2);
+      expect(utilRegistry.setup.calls.count()).toBe(3);
      expect(utilRegistry.setup.calls.argsFor(0)).toEqual([TestUtil1, undefined]);
      expect(utilRegistry.setup.calls.argsFor(1)).toEqual([TestUtil2, undefined]);
+      expect(utilRegistry.setup.calls.argsFor(2)).toEqual([TestUtil3, undefined]);
    });

    it('should pass the given scope', () => {
      spyOn(utilRegistry, 'setup');
      utilRegistry.register(TestUtil1);
      const scope = document.createElement('div');
-      utilRegistry.setupAll(scope);
+      utilRegistry.initAll(scope);

      expect(utilRegistry.setup).toHaveBeenCalledWith(TestUtil1, scope);
    });
+
+    describe('starts startable util instances', () => {
+      let testScope,
+          testElement1,
+          testElement2,
+          testElement3,
+          testElement4;
+
+      beforeEach(() => {
+        testScope    = document.createElement('div');
+
+        testElement1 = document.createElement('div');
+        testElement2 = document.createElement('div');
+        testElement3 = document.createElement('div');
+        testElement4 = document.createElement('div');
+
+        testElement1.classList.add('util1');
+        testElement2.id = 'util2';
+        testElement3.classList.add('util3');
+        testElement4.classList.add('util3');
+
+        testScope.appendChild(testElement1);
+        testScope.appendChild(testElement2);
+        testScope.appendChild(testElement3);
+        testScope.appendChild(testElement4);
+      });
+
+      it('should start instances that provide a start function', () => {
+        utilRegistry.register(TestUtil3);
+        const initializedInstances = utilRegistry.initAll(testScope);
+
+        expect(initializedInstances.length).toBe(2);
+      });
+
+      it('should not start instances that do not provide a start function', () => {
+        utilRegistry.register(TestUtil1);
+        utilRegistry.register(TestUtil2);
+        const startedInstances = utilRegistry.initAll(testScope);
+        
+        expect(startedInstances.length).toBe(0);
+      });
+    });
  });
 });

@ -138,6 +186,12 @@ class TestUtil1 {
@Utility({ selector: '#util2' })
 class TestUtil2 { }

+@Utility({ selector: '.util3' })
+class TestUtil3 {
+  constructor() {}
+  start() {}
+}
+
@Utility({ selector: '#throws' })
 class ThrowingUtil {
  constructor() {
--- a/frontend/src/utils/async-table/async-table.js
+++ b/frontend/src/utils/async-table/async-table.js
@ -3,10 +3,14 @@ import { StorageManager, LOCATION } from '../../lib/storage-manager/storage-mana
 import { Datepicker } from '../form/datepicker';
 import { HttpClient } from '../../services/http-client/http-client';
 import * as debounce from 'lodash.debounce';
+import * as throttle from 'lodash.throttle';
 import './async-table-filter.sass';
 import './async-table.sass';

+const ATTR_SUBMIT_LOCKED = 'submit-locked';
+
 const INPUT_DEBOUNCE = 600;
+const FILTER_DEBOUNCE = 100;
 const HEADER_HEIGHT = 80;

 const ASYNC_TABLE_LOCAL_STORAGE_KEY = 'ASYNC_TABLE';
@ -33,6 +37,8 @@ export class AsyncTable {
  _scrollTable;
  _cssIdPrefix = '';

+  _cancelPendingUpdates = [];
+
  _tableFilterInputs = {
    search: [],
    input: [],
@ -58,7 +64,7 @@ export class AsyncTable {
    if (this._element.classList.contains(ASYNC_TABLE_INITIALIZED_CLASS)) {
      return false;
    }
-
+      
    // param asyncTableDbHeader
    if (this._element.dataset.asyncTableDbHeader !== undefined) {
      this._asyncTableHeader = this._element.dataset.asyncTableDbHeader;
@ -79,9 +85,6 @@ export class AsyncTable {
      throw new Error('Async Table cannot be set up without a scrolltable element!');
    }

-    this._setupSortableHeaders();
-    this._setupPagination();
-    this._setupPageSizeSelect();
    this._setupTableFilter();

    this._processStorage();
@ -93,11 +96,18 @@ export class AsyncTable {
    this._element.classList.add(ASYNC_TABLE_INITIALIZED_CLASS);
  }

+  start() {
+    this._startSortableHeaders();
+    this._startPagination();
+    this._startPageSizeSelect();
+    this._startTableFilter();
+  }
+
  destroy() {
    console.log('TBD: Destroy AsyncTable');
  }

-  _setupSortableHeaders() {
+  _startSortableHeaders() {
    this._ths = Array.from(this._scrollTable.querySelectorAll('th.sortable, .course-header'))
      .map((th) => ({ element: th }));

@ -110,7 +120,7 @@ export class AsyncTable {
    });
  }

-  _setupPagination() {
+  _startPagination() {
    const pagination = this._element.querySelector('#' + this._cssIdPrefix + this._asyncTableId + '-pagination');
    if (pagination) {
      this._pageLinks = Array.from(pagination.querySelectorAll('.page-link'))
@ -134,7 +144,7 @@ export class AsyncTable {
    }
  }

-  _setupPageSizeSelect() {
+  _startPageSizeSelect() {
    // pagesize form
    this._pagesizeForm = this._element.querySelector('#' + this._cssIdPrefix + this._asyncTableId + '-pagesize-form');

@ -148,70 +158,88 @@ export class AsyncTable {
    const tableFilterForm = this._element.querySelector(ASYNC_TABLE_FILTER_FORM_SELECTOR);
    if (tableFilterForm) {
      this._gatherTableFilterInputs(tableFilterForm);
+    }
+  }
+
+  _startTableFilter() {
+    const tableFilterForm = this._element.querySelector(ASYNC_TABLE_FILTER_FORM_SELECTOR);
+    if (tableFilterForm) {
      this._addTableFilterEventListeners(tableFilterForm);
    }
  }

  _gatherTableFilterInputs(tableFilterForm) {
-    Array.from(tableFilterForm.querySelectorAll('input[type="search"]')).forEach((input) => {
-      this._tableFilterInputs.search.push(input);
+    Array.from(tableFilterForm.querySelectorAll('input')).forEach((input) => {
+      const inputType = input.getAttribute('type');
+      if (inputType === 'search') {
+        this._tableFilterInputs.search.push(input);
+      } else if (['text','date','time','datetime-local'].includes(inputType)) {
+        this._tableFilterInputs.input.push(input);
+      } else {
+        this._tableFilterInputs.change.push(input);
+      }
    });

-    Array.from(tableFilterForm.querySelectorAll('input[type="text"]')).forEach((input) => {
-      this._tableFilterInputs.input.push(input);
-    });
-
-    Array.from(tableFilterForm.querySelectorAll('input:not([type="text"]):not([type="search"])')).forEach((input) => {
-      this._tableFilterInputs.change.push(input);
-    });
-
-    Array.from(tableFilterForm.querySelectorAll('select')).forEach((input) => {
-      this._tableFilterInputs.select.push(input);
-    });
+    Array.from(tableFilterForm.querySelectorAll('select')).forEach((input) => this._tableFilterInputs.select.push(input));
  }

  _addTableFilterEventListeners(tableFilterForm) {
-    this._tableFilterInputs.search.forEach((input) => {
-      const debouncedInput = debounce(() => {
-        if (input.value.length === 0 || input.value.length > 2) {
-          this._updateFromTableFilter(tableFilterForm);
-        }
-      }, INPUT_DEBOUNCE);
-      input.addEventListener('input', debouncedInput);
-      input.addEventListener('input', () => {
-        // set flag to ignore any currently pending requests (not debounced)
-        this._ignoreRequest = true;
-      });
-    });
+    const debouncedUpdateFromTableFilter = throttle((() => this._updateFromTableFilter(tableFilterForm)).bind(this), FILTER_DEBOUNCE, { leading: true, trailing: false });
+
+    [...this._tableFilterInputs.search, ...this._tableFilterInputs.input].forEach((input) => {
+      const submitLockObserver = new MutationObserver((mutations, observer) => {
+        for (const mutation of mutations) {
+          // if the submit lock has been released, trigger an update and disconnect this observer
+          if (mutation.target === input && mutation.attributeName === ATTR_SUBMIT_LOCKED && mutation.oldValue === 'true' && mutation.target.getAttribute(mutation.attributeName) === 'false') {
+            debouncedUpdateFromTableFilter();
+            observer.disconnect();
+            break;
+          }
+        }
+      });
+      this._cancelPendingUpdates.push(() => { submitLockObserver.disconnect(); });

-    this._tableFilterInputs.input.forEach((input) => {
      const debouncedInput = debounce(() => {
-        if (input.value.length === 0 || input.value.length > 2) {
-          this._updateFromTableFilter(tableFilterForm);
+        const submitLockedAttr = input.getAttribute(ATTR_SUBMIT_LOCKED);
+        const submitLocked = submitLockedAttr === 'true';
+        if (!submitLocked && (input.value.length === 0 || input.value.length > 2)) {
+          debouncedUpdateFromTableFilter();
+        } else if (submitLockedAttr === 'true') {
+          // observe the submit lock of the input element
+          submitLockObserver.observe(input, {
+            attributes: true,
+            attributeFilter: [ATTR_SUBMIT_LOCKED],
+            attributeOldValue: true,
+          });
        }
      }, INPUT_DEBOUNCE);
-      input.addEventListener('input', debouncedInput);
+      this._cancelPendingUpdates.push(debouncedInput.cancel);
+
      input.addEventListener('input', () => {
-        // set flag to ignore any currently pending requests (not debounced)
        this._ignoreRequest = true;
+        debouncedInput();
      });
    });

    this._tableFilterInputs.change.forEach((input) => {
      input.addEventListener('change', () => {
-        this._updateFromTableFilter(tableFilterForm);
+        //if (this._element.classList.contains(ASYNC_TABLE_LOADING_CLASS))
+        this._ignoreRequest = true;
+        debouncedUpdateFromTableFilter();
      });
    });

    this._tableFilterInputs.select.forEach((input) => {
      input.addEventListener('change', () => {
-        this._updateFromTableFilter(tableFilterForm);
+        this._ignoreRequest = true;
+        debouncedUpdateFromTableFilter();
      });
    });

    tableFilterForm.addEventListener('submit', (event) =>{
      event.preventDefault();
-      this._updateFromTableFilter(tableFilterForm);
+      this._ignoreRequest = true;
+      debouncedUpdateFromTableFilter();
    });
  }

@ -236,15 +264,14 @@ export class AsyncTable {
        }
      };
    }
-    this._ignoreRequest = false;
-    this._updateTableFrom(url, callback);
+    this._updateTableFrom(url, callback && callback.bind(this));
  }

  _serializeTableFilterToURL(tableFilterForm) {
    const url = new URL(this._storageManager.load('currentTableUrl') || window.location.href);

    // create new FormData and format any date values
-    const formData = Datepicker.unformatAll(this._massInputForm, new FormData(tableFilterForm));
+    const formData = Datepicker.unformatAll(tableFilterForm, new FormData(tableFilterForm));

    for (var k of url.searchParams.keys()) {
      url.searchParams.delete(k);
@ -321,6 +348,12 @@ export class AsyncTable {

  // fetches new sorted element from url with params and replaces contents of current element
  _updateTableFrom(url, callback) {
+    const cancelPendingUpdates = (() => {
+      this._cancelPendingUpdates.forEach(f => f());
+    }).bind(this);
+    [0, INPUT_DEBOUNCE * 1.5, FILTER_DEBOUNCE * 1.5].forEach(delay => window.setTimeout(cancelPendingUpdates, delay));
+    this._ignoreRequest = false;
+    
    this._element.classList.add(ASYNC_TABLE_LOADING_CLASS);

    const headers = {
@ -346,7 +379,7 @@ export class AsyncTable {
      // update table with new
      this._element.innerHTML = response.element.innerHTML;

-      this._app.utilRegistry.setupAll(this._element);
+      this._app.utilRegistry.initAll(this._element);

      if (callback && typeof callback === 'function') {
        this._storageManager.save('cssIdPrefix', response.idPrefix);
--- a/frontend/src/utils/async-table/async-table.spec.js
+++ b/frontend/src/utils/async-table/async-table.spec.js
@ -8,7 +8,7 @@ const AppTestMock = {
    parseResponse: () => {},
  },
  utilRegistry: {
-    setupAll: () => {},
+    initAll: () => {},
  },
 };

--- a/frontend/src/utils/check-all/check-all.js
+++ b/frontend/src/utils/check-all/check-all.js
@ -93,7 +93,7 @@ export class CheckAll {
    th.insertBefore(this._checkAllCheckbox, th.firstChild);

    // set up new checkbox
-    this._app.utilRegistry.setupAll(th);
+    this._app.utilRegistry.initAll(th);

    this._checkAllCheckbox.addEventListener('input', () => this._onCheckAllCheckboxInput());
    this._setupCheckboxListeners();
--- a/frontend/src/utils/check-all/check-all.spec.js
+++ b/frontend/src/utils/check-all/check-all.spec.js
@ -2,7 +2,7 @@ import { CheckAll } from './check-all';

 const MOCK_APP = {
  utilRegistry: {
-    setupAll: () => {},
+    initAll: () => {},
  },
 };

--- a/frontend/src/utils/form/datepicker.js
+++ b/frontend/src/utils/form/datepicker.js
@ -6,6 +6,10 @@ import moment from 'moment';
 const KEYCODE_ESCAPE = 27;
 const Z_INDEX_MODAL = 9999;

+// should be the same as ATTR_SUBMIT_LOCKED in async-table util
+// TODO move to global config
+const ATTR_DATEPICKER_OPEN = 'submit-locked';
+
 // INTERNAL (Uni2work specific) formats for formatting dates and/or times
 const FORM_DATE_FORMAT = {
  'date': moment.HTML5_FMT.DATE,
@ -26,21 +30,10 @@ const FORM_DATE_FORMAT_MOMENT = {
  'datetime-local': `${FORM_DATE_FORMAT_DATE_MOMENT} ${FORM_DATE_FORMAT_TIME_MOMENT}`,
 };

-/**
- * Takes a string representation of a date, an input ('previous') format and a desired output format and returns a reformatted date string.
- * If the date string is not valid (i.e. cannot be parsed with the given input format string), returns the original date string;
- * @param {*} dateStr string representation of a date (needs to be in format formatIn)
- * @param {*} formatIn input format string
- * @param {*} formatOut format string of the desired output date string
- */
-function reformatDateString(dateStr, formatIn, formatOut) {
-  const parsedMomentDate = moment(dateStr, [formatIn, formatOut]);
-  return parsedMomentDate.isValid() ? parsedMomentDate.format(formatOut) : dateStr;
-}
-
 const DATEPICKER_UTIL_SELECTOR = 'input[type="date"], input[type="time"], input[type="datetime-local"]';

 const DATEPICKER_INITIALIZED_CLASS = 'datepicker--initialized';
+const DATEPICKER_OPEN_CLASS = 'calendar-open';

 const DATEPICKER_CONFIG = {
  'global': {
@ -107,13 +100,13 @@ export class Datepicker {
    // store the previously set type to select the input format
    this.elementType = this._element.getAttribute('type');

+    // manually set the type attribute to text because datepicker handles displaying the date
+    this._element.setAttribute('type', 'text');
+
    // get all relevant config options for this datepicker type
    const datepickerGlobalConfig = DATEPICKER_CONFIG['global'];
    const datepickerConfig = DATEPICKER_CONFIG[this.elementType];

-    // manually set the type attribute to text because datepicker handles displaying the date
-    this._element.setAttribute('type', 'text');
-
    // additional position config (optional data-datepicker-position attribute in html) that can specialize the global config
    const datepickerPosition = this._element.dataset.datepickerPosition;
    if (datepickerPosition) {
@ -162,7 +155,9 @@ export class Datepicker {

    // mark the form input element as initialized
    this._element.classList.add(DATEPICKER_INITIALIZED_CLASS);
+  }

+  start() {
    const setDatepickerDate = () => {
      // try to parse the current input element value with fancy and internal format string
      const parsedMomentDate = moment(this._element.value, FORM_DATE_FORMAT_MOMENT[this.elementType]);
@ -181,6 +176,24 @@ export class Datepicker {
    // change the selected date in the tail.datetime instance if the value of the input element is changed
    this._element.addEventListener('change', setDatepickerDate, { once: true });

+
+    // create a mutation observer that observes the datepicker instance class and sets
+    // the datepicker-open DOM attribute of the input element if the datepicker has been opened
+    const datepickerInstanceObserver = new MutationObserver((mutations) => {
+      for (const mutation of mutations) {
+        if (!mutation.oldValue.includes(DATEPICKER_OPEN_CLASS) && this.datepickerInstance.dt.getAttribute('class').includes(DATEPICKER_OPEN_CLASS)) {
+          this._element.setAttribute(ATTR_DATEPICKER_OPEN, true);
+          break;
+        }
+      }
+    });
+    datepickerInstanceObserver.observe(this.datepickerInstance.dt, {
+      attributes: true,
+      attributeFilter: ['class'],
+      attributeOldValue: true,
+    });
+
+
    // close the instance on focusout of any element if another input is focussed that is neither the timepicker nor _element
    window.addEventListener('focusout', event => {
      const hasFocus                = event.relatedTarget !== null;
@ -188,7 +201,7 @@ export class Datepicker {
      const focussedIsNotElement    = event.relatedTarget !== this._element;
      const focussedIsInDocument    = window.document.contains(event.relatedTarget);
      if (hasFocus && focussedIsNotTimepicker && focussedIsNotElement && focussedIsInDocument)
-        this.datepickerInstance.close();
+        this.closeDatepickerInstance();
    });
    
    // close the instance on click on any element outside of the datepicker (except the input element itself)
@ -198,13 +211,13 @@ export class Datepicker {
      const targetIsInDocument = window.document.contains(event.target);
      const targetIsNotElement = event.target !== this._element;
      if (targetIsOutside && targetIsInDocument && targetIsNotElement)
-        this.datepickerInstance.close();
+        this.closeDatepickerInstance();
    });

    // close the instance on escape keydown events
    this._element.addEventListener('keydown', event => {
      if (event.keyCode === KEYCODE_ESCAPE) {
-        this.datepickerInstance.close();
+        this.closeDatepickerInstance();
      }
    });

@ -216,6 +229,24 @@ export class Datepicker {
    this.datepickerInstance.remove();
  }

+  
+  //  DATEPICKER INSTANCE CONTROL
+
+  /**
+   * Closes the datepicker instance, releasing the lock on the input element.
+   */
+  closeDatepickerInstance() {
+    if (!this._element.datepicker-open) {
+      throw new Error('Cannot close already closed datepicker instance!');
+    }
+
+    this._element.setAttribute(ATTR_DATEPICKER_OPEN, false);
+    this.datepickerInstance.close();
+  }
+
+  
+  //  FORMAT METHODS
+
  /**
   * Formats the value of this input element from datepicker format (i.e. DATEPICKER_CONFIG.dateFormat + " " + datetime.defaults.timeFormat) to Uni2work internal date format (i.e. FORM_DATE_FORMAT) required for form submission
   * @param {*} toFancy optional target format switch (boolean value; default is false). If set to a truthy value, formats the element value to fancy instead of internal date format.
@ -226,8 +257,6 @@ export class Datepicker {
    }
  }

-
-
  /**
   * Returns a datestring in internal format from the current state of the input element value.
   * @param {*} toFancy Format date from internal to fancy or vice versa. When omitted, toFancy is falsy and results in fancy -> internal
@ -265,3 +294,18 @@ export class Datepicker {
    return formData;
  }
 }
+
+
+//  HELPER FUNCTIONS
+
+/**
+ * Takes a string representation of a date, an input ('previous') format and a desired output format and returns a reformatted date string.
+ * If the date string is not valid (i.e. cannot be parsed with the given input format string), returns the original date string;
+ * @param {*} dateStr string representation of a date (needs to be in format formatIn)
+ * @param {*} formatIn input format string
+ * @param {*} formatOut format string of the desired output date string
+ */
+function reformatDateString(dateStr, formatIn, formatOut) {
+  const parsedMomentDate = moment(dateStr, [formatIn, formatOut]);
+  return parsedMomentDate.isValid() ? parsedMomentDate.format(formatOut) : dateStr;
+}
--- a/frontend/src/utils/hide-columns/hide-columns.js
+++ b/frontend/src/utils/hide-columns/hide-columns.js
@ -4,6 +4,8 @@ import './hide-columns.sass';

 const HIDE_COLUMNS_CONTAINER_IDENT = 'uw-hide-columns';
 const TABLE_HEADER_IDENT = 'uw-hide-column-header';
+const HIDE_COLUMNS_HIDER_LABEL = 'uw-hide-columns--hider-label';
+const HIDE_COLUMNS_NO_HIDE = 'uw-hide-columns--no-hide';

 const TABLE_UTILS_ATTR = 'table-utils';
 const TABLE_UTILS_CONTAINER_SELECTOR = `[${TABLE_UTILS_ATTR}]`;
@ -21,7 +23,7 @@ const CELL_ORIGINAL_COLSPAN = 'uw-hide-column-original-colspan';
 })
 export class HideColumns {

-  _storageManager = new StorageManager('HIDE_COLUMNS', '1.0.0', { location: LOCATION.LOCAL });
+  _storageManager = new StorageManager('HIDE_COLUMNS', '1.1.0', { location: LOCATION.LOCAL });

  _element;
  _elementWrapper;
@ -44,8 +46,8 @@ export class HideColumns {
      throw new Error('Hide Columns utility cannot be setup without an element!');
    }

-    // do not provide hide-column ability in tables inside modals or async forms with response
-    if (element.closest('[uw-modal], .async-form__response')) {
+    // do not provide hide-column ability in tables inside modals, async forms with response or tail.datetime instances
+    if (element.closest('[uw-modal], .async-form__response, .tail-datetime-calendar')) {
      return false;
    }

@ -66,7 +68,7 @@ export class HideColumns {
      hideColumnsContainer.insertBefore(this._tableUtilContainer, tableContainer);
    }

-    this._element.querySelectorAll('th').forEach(th => this.setupHideButton(th));
+    [...this._element.querySelectorAll('th')].filter(th => !th.hasAttribute(HIDE_COLUMNS_NO_HIDE)).forEach(th => this.setupHideButton(th));
  }

  setupHideButton(th) {
@ -80,7 +82,7 @@ export class HideColumns {

    const hiderContent = document.createElement('span');
    hiderContent.classList.add('table-hider__label');
-    hiderContent.innerHTML = th.innerText;
+    hiderContent.innerHTML = th.getAttribute(HIDE_COLUMNS_HIDER_LABEL) || th.innerText;
    hider.appendChild(hiderContent);

    this.addHeaderHider(th, hider);
--- a/frontend/src/utils/mass-input/mass-input.js
+++ b/frontend/src/utils/mass-input/mass-input.js
@ -155,7 +155,7 @@ export class MassInput {

    this._reset();

-    this._app.utilRegistry.setupAll(this._element);
+    this._app.utilRegistry.initAll(this._element);
  }

  _serializeForm(submitButton, enctype) {
--- a/frontend/src/utils/modal/modal.js
+++ b/frontend/src/utils/modal/modal.js
@ -177,6 +177,6 @@ export class Modal {
    this._element.insertBefore(modalContent, null);

    // setup any newly arrived utils
-    this._app.utilRegistry.setupAll(this._element);
+    this._app.utilRegistry.initAll(this._element);
  }
 }
--- a/messages/uniworx/de-de-formal.msg
+++ b/messages/uniworx/de-de-formal.msg
@ -12,6 +12,8 @@ BtnCourseDeregister: Vom Kurs abmelden
 BtnCourseApply: Zum Kurs bewerben
 BtnCourseRetractApplication: Bewerbung zum Kurs zurückziehen
 BtnExamRegister: Anmelden zur Prüfung
+BtnExamRegisterOccurrence: Anmelden zum Prüfungstermin/-raum
+BtnExamSwitchOccurrence: Zu Prüfungstermin/-raum wechseln
 BtnExamDeregister: Von der Prüfung abmelden
 BtnHijack: Sitzung übernehmen
 BtnSave: Speichern
@ -99,6 +101,7 @@ CourseCapacity: Kapazität
 CourseCapacityTip: Anzahl erlaubter Kursanmeldungen, leer lassen für unbeschränkte Kurskapazität
 CourseNoCapacity: In diesem Kurs sind keine Plätze mehr frei.
 TutorialNoCapacity: In dieser Übung sind keine Plätze mehr frei.
+ExamOccurrenceNoCapacity: Zu diesem Termin/Raum sind keine Plätze mehr frei.
 CourseNotEmpty: In diesem Kurs sind momentan Teilnehmer angemeldet.
 CourseRegistration: Kursanmeldung
 CourseRegisterOpen: Anmeldung möglich
@ -409,6 +412,7 @@ UnauthorizedCorrectorAny: Sie sind nicht als Korrektor für eine Veranstaltung e
 UnauthorizedRegistered: Sie sind nicht als Teilnehmer für diese Veranstaltung registriert.
 UnauthorizedAllocationRegistered: Sie sind nicht als Teilnehmer für diese Zentralanmeldung registriert.
 UnauthorizedExamResult: Sie haben keine Ergebnisse in dieser Prüfung.
+UnauthorizedExamOccurrenceRegistration: Anmeldung zur Klausur erfolgt nicht inkl. Raum/Termin.
 UnauthorizedParticipant: Angegebener Benutzer ist nicht als Teilnehmer dieser Veranstaltung registriert.
 UnauthorizedParticipantSelf: Sie sind kein Teilnehmer dieser Veranstaltung.
 UnauthorizedApplicant: Angegebener Benutzer hat sich nicht für diese Veranstaltung beworben.
@ -1208,8 +1212,7 @@ BreadcrumbTerm: Semester
 BreadcrumbSchool: Institut
 BreadcrumbUser: Benutzer
 BreadcrumbStatic: Statische Resource
-BreadcrumbFavicon: Favicon
-BreadcrumbRobots: robots.txt
+BreadcrumbWellKnown: Benannte statische Resource
 BreadcrumbMetrics: Metriken
 BreadcrumbLecturerInvite: Einladung zum Kursverwalter
 BreadcrumbExamOfficeUserInvite: Einladung bzgl. Prüfungsleistungen
@ -1264,6 +1267,8 @@ AuthTagAllocationRegistered: Nutzer nimmt an der Zentralanmeldung teil
 AuthTagTutorialRegistered: Nutzer ist Tutoriumsteilnehmer
 AuthTagExamRegistered: Nutzer ist Prüfungsteilnehmer
 AuthTagExamResult: Nutzer hat Prüfungsergebnisse
+AuthTagExamOccurrenceRegistered: Nutzer ist für Prüfungsraum/-termin angemeldet
+AuthTagExamOccurrenceRegistration: Anmeldung zur Klausur erfolgt inkl. Raum/Termin
 AuthTagParticipant: Nutzer ist mit Kurs assoziiert
 AuthTagApplicant: Nutzer ist mit Bewerber zum Kurs
 AuthTagRegisterGroup: Nutzer ist nicht Mitglied eines anderen Tutoriums mit der selben Registrierungs-Gruppe
@ -1523,6 +1528,8 @@ ExamNoBonus': Kein automatischer Bonus
 ExamBonusPoints': Umrechnung von Übungspunkten
 ExamBonusManual': Manuelle Berechnung

+ExamRegisterForOccurrence: Anmeldung zur Klausur erfolgt durch Anmeldung zu einem Termin/Raum
+
 ExamBonusAchieved: Bonuspunkte

 ExamEditHeading examn@ExamName: #{examn} bearbeiten
@ -1535,17 +1542,19 @@ ExamBonusRound: Bonus runden auf
 ExamBonusRoundNonPositive: Vielfaches, auf das gerundet werden soll, muss positiv und größer null sein
 ExamBonusRoundTip: Bonuspunkte werden kaufmännisch auf ein Vielfaches der angegeben Zahl gerundet.

-ExamAutomaticOccurrenceAssignment: Automatische Termin- bzw. Raumzuteilung
-ExamAutomaticOccurrenceAssignmentTip: Sollen Prüfungsteilnehmer automatisch auf die zur Verfügung stehenden Räume bzw. Termine verteilt werden? Manuelle Umverteilung bzw. vorheriges Festlegen von Zuteilungen einzelner Teilnehmer ist trotzdem möglich.
+ExamAutomaticOccurrenceAssignment: Termin- bzw. Raumzuteilung
+ExamAutomaticOccurrenceAssignmentTip: Sollen Prüfungsteilnehmer automatisch auf die zur Verfügung stehenden Räume bzw. Termine verteilt werden, sich selbstständig einen Raum bzw. Termin aussuchen dürfen oder manuell durch Kursverwalter zugeteilt werden? Manuelle Umverteilung bzw. vorheriges Festlegen von Zuteilungen einzelner Teilnehmer ist trotzdem möglich.
 ExamOccurrenceRule: Verfahren
 ExamOccurrenceRuleParticipant: Termin- bzw. Raumzuteilungsverfahren
-ExamRoomManual': Keine automatische Zuteilung
+ExamRoomManual': Keine automatische bzw. selbstständige Zuteilung
 ExamRoomSurname': Nach Nachname
 ExamRoomMatriculation': Nach Matrikelnummer
 ExamRoomRandom': Zufällig pro Teilnehmer
+ExamRoomFifo': Auswahl durch Teilnehmer bei Anmeldung

 ExamOccurrence: Termin/Raum
 ExamNoOccurrence: Kein Termin/Raum
+ExamNoSuchOccurrence: Termin/Raum existiert nicht (mehr)
 ExamOccurrences: Prüfungen
 ExamRooms: Räume
 ExamRoomAlreadyExists: Prüfung ist bereits eingetragen
@ -1558,7 +1567,8 @@ ExamRoomStart: Beginn
 ExamRoomEnd: Ende
 ExamRoomDescription: Beschreibung
 ExamTimeTip: Nur zur Information der Studierenden, die tatsächliche Zeitangabe erfolgt pro Prüfung
-ExamRoomRegistered: Zugeteilt
+ExamRoomAssigned: Zugeteilt
+ExamRoomRegistered: Anmeldung

 ExamOccurrenceStart: Prüfungsbeginn

@ -1604,6 +1614,7 @@ ExamDeregisteredSuccess exam@ExamName: Erfolgreich von der Prüfung #{exam} abge
 ExamRegistered: Zur Prüfung angemeldet
 ExamNotRegistered: Nicht zur Prüfung angemeldet
 ExamRegistration: Prüfungsanmeldung
+ExamLoginToRegister: Um sich zum Kurs anzumelden müssen Sie zunächst in Uni2work anmelden

 ExamRegisterToMustBeAfterRegisterFrom: "Anmeldung ab" muss vor "Anmeldung bis" liegen
 ExamDeregisterUntilMustBeAfterRegisterFrom: "Abmeldung bis" muss nach "Anmeldung bis" liegen
@ -1650,6 +1661,8 @@ ExamUserMarkedSynchronised n@Int: #{n} #{pluralDE n "Prüfungsleistung" "Prüfun

 ExamOfficeExamUsersHeading: Prüfungsleistungen

+ActionsHead: Aktionen
+
 CsvFile: CSV-Datei
 CsvImport: CSV-Import
 CsvExport: CSV-Export
@ -1669,6 +1682,7 @@ CsvImportAborted: CSV-Import abgebrochen
 CsvImportExplanationLabel: Hinweise zum CSV-Import

 Proportion c@Text of@Text prop@Rational: #{c}/#{of} (#{rationalToFixed2 (100 * prop)}%)
+ProportionNoRatio c@Text of@Text: #{c}/#{of}

 CourseUserCsvName tid@TermId ssh@SchoolId csh@CourseShorthand: #{foldCase (termToText (unTermKey tid))}-#{foldedCase (unSchoolKey ssh)}-#{foldedCase csh}-teilnehmer
 ExamUserCsvName tid@TermId ssh@SchoolId csh@CourseShorthand examn@ExamName: #{foldCase (termToText (unTermKey tid))}-#{foldedCase (unSchoolKey ssh)}-#{foldedCase csh}-#{foldedCase examn}-teilnehmer
--- a/messages/uniworx/en-eu.msg
+++ b/messages/uniworx/en-eu.msg
@ -12,6 +12,8 @@ BtnCourseDeregister: Leave course
 BtnCourseApply: Apply for course
 BtnCourseRetractApplication: Retract application
 BtnExamRegister: Enrol for exam
+BtnExamRegisterOccurrence: Enrol for exam occurrence/room
+BtnExamSwitchOccurrence: Switch to exam occurrence/room
 BtnExamDeregister: Leave exam
 BtnHijack: Hijack session
 BtnSave: Save
@ -99,6 +101,7 @@ CourseCapacity: Capacity
 CourseCapacityTip: Maximum permissable number of enrolments for this course; leave empty for unlimited capacity
 CourseNoCapacity: Course has reached maximum capacity
 TutorialNoCapacity: Tutorial has reached maximum capacity
+ExamOccurrenceNoCapacity: Occurrence/Room has reached maximum capacity
 CourseNotEmpty: There are currently no participants enrolled for this course.
 CourseRegistration: Enrolment
 CourseRegisterOpen: Enrolment is allowed
@ -407,6 +410,7 @@ UnauthorizedCorrectorAny: You are no corrector for any course.
 UnauthorizedRegistered: You are no participant in this course.
 UnauthorizedAllocationRegistered: You are no participant in this central allocation.
 UnauthorizedExamResult: You have no results in this exam.
+UnauthorizedExamOccurrenceRegistration: Registration for exam is not done including occurrence/room.
 UnauthorizedParticipant: The specified user is no participant of this course.
 UnauthorizedParticipantSelf: You are no participant of this course.
 UnauthorizedApplicant: The specified user is no applicant for this course.
@ -1207,8 +1211,7 @@ BreadcrumbTerm: Semester
 BreadcrumbSchool: Department
 BreadcrumbUser: User
 BreadcrumbStatic: Static resource
-BreadcrumbFavicon: Favicon
-BreadcrumbRobots: robots.txt
+BreadcrumbWellKnown: Named static resource
 BreadcrumbMetrics: Metrics
 BreadcrumbLecturerInvite: Invitation to be a course administrator
 BreadcrumbExamOfficeUserInvite: Invitation regarding exam achievements
@ -1263,6 +1266,8 @@ AuthTagAllocationRegistered: User participates in central allocation
 AuthTagTutorialRegistered: User is tutorial participant
 AuthTagExamRegistered: User is exam participant
 AuthTagExamResult: User has an exam result
+AuthTagExamOccurrenceRegistered: User is registered for exam occurrence/room
+AuthTagExamOccurrenceRegistration: Registration for exam is done including occurrence/room
 AuthTagParticipant: User participates in course
 AuthTagApplicant: User is applicant for course
 AuthTagRegisterGroup: User is not participant in any tutorial of the same registration group
@ -1521,6 +1526,8 @@ ExamNoBonus': No automatic exam bonus
 ExamBonusPoints': Compute from exercise achievements
 ExamBonusManual': Manual computation

+ExamRegisterForOccurrence: Registration for this exam is done by registering for an occurrence/room
+
 ExamBonusAchieved: Bonus points

 ExamEditHeading examn: Edit #{examn}
@ -1533,17 +1540,19 @@ ExamBonusRound: Round bonus to
 ExamBonusRoundNonPositive: Rounding multiple must be positive and greater than zero
 ExamBonusRoundTip: Bonus points are rounded commercially to a multiple of the given number

-ExamAutomaticOccurrenceAssignment: Automatically assign occurrence/room
-ExamAutomaticOccurrenceAssignmentTip: Should exam participants be distributed automatically among the configured occurrences/rooms? Manipulation of the distribution and manually assigning participants remains possible.
+ExamAutomaticOccurrenceAssignment: Selection of occurrences/rooms for/by participants
+ExamAutomaticOccurrenceAssignmentTip: Should exam participants be distributed automatically among the configured occurrences/rooms, should they instead be permitted to autonomously choose an occurrence/a room, or should they be assigned to occurrences/rooms manually by course administrators? Manipulation of the distribution and manually assigning participants remains possible.
 ExamOccurrenceRule: Procedure
 ExamOccurrenceRuleParticipant: Occurrence/room assignment procedure
-ExamRoomManual': No automatic assignment
+ExamRoomManual': No automatic or autonomous assignment
 ExamRoomSurname': By surname
 ExamRoomMatriculation': By matriculation
 ExamRoomRandom': Randomly
+ExamRoomFifo': Selected by the participants when registering

 ExamOccurrence: Occurrence/room
 ExamNoOccurrence: No occurrence/room
+ExamNoSuchOccurrence: Occurrence/Room does not exist (anymore)
 ExamOccurrences: Exams
 ExamRooms: Rooms
 ExamRoomAlreadyExists: Occurrence already configured
@ -1556,7 +1565,8 @@ ExamRoomStart: Start
 ExamRoomEnd: End
 ExamRoomDescription: Description
 ExamTimeTip: Only for informational purposes. The actual times are set for each occurrence/room
-ExamRoomRegistered: Assigned
+ExamRoomAssigned: Assigned
+ExamRoomRegistered: Registration

 ExamOccurrenceStart: Exam starts

@ -1602,6 +1612,7 @@ ExamDeregisteredSuccess exam: Successufly deregistered from the exam #{exam}
 ExamRegistered: Registered for the exam
 ExamNotRegistered: Not registered for the exam
 ExamRegistration: Exam registration
+ExamLoginToRegister: Your need to login to Uni2work before you can register for this course.

 ExamRegisterToMustBeAfterRegisterFrom: "Register to" must be after "register from"
 ExamDeregisterUntilMustBeAfterRegisterFrom: "Deregister until" must be after "register from"
@ -1648,6 +1659,8 @@ ExamUserMarkedSynchronised n: Successfully marked #{n} #{pluralEN n "exam achiev

 ExamOfficeExamUsersHeading: Exam achievements

+ActionsHead: Actions
+
 CsvFile: CSV file
 CsvImport: CSV import
 CsvExport: CSV export
@ -1667,6 +1680,7 @@ CsvImportAborted: CSV import aborted
 CsvImportExplanationLabel: Informating regarding CSV import

 Proportion c of prop: #{c}/#{of} (#{rationalToFixed2 (100 * prop)}%)
+ProportionNoRatio c of: #{c}/#{of}

 CourseUserCsvName tid ssh csh: #{foldCase (termToText (unTermKey tid))}-#{foldedCase (unSchoolKey ssh)}-#{foldedCase csh}-participants
 ExamUserCsvName tid ssh csh examn: #{foldCase (termToText (unTermKey tid))}-#{foldedCase (unSchoolKey ssh)}-#{foldedCase csh}-#{foldedCase examn}-participants
--- a/models/exams.model
+++ b/models/exams.model
@ -3,7 +3,7 @@ Exam
  name ExamName
  gradingRule ExamGradingRule Maybe
  bonusRule ExamBonusRule Maybe
-  occurrenceRule ExamOccurrenceRule Maybe
+  occurrenceRule ExamOccurrenceRule
  visibleFrom UTCTime Maybe
  registerFrom UTCTime Maybe
  registerTo UTCTime Maybe
--- a/package-lock.json
+++ b/package-lock.json
@ -1,6 +1,6 @@
 {
  "name": "uni2work",
-  "version": "10.1.0",
+  "version": "10.3.0",
  "lockfileVersion": 1,
  "requires": true,
  "dependencies": {
@ -3383,6 +3383,42 @@
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      "dev": true
    },
+    "axios": {
+      "version": "0.18.1",
+      "resolved": "https://registry.npmjs.org/axios/-/axios-0.18.1.tgz",
+      "integrity": "sha512-0BfJq4NSfQXd+SkFdrvFbG7addhYSBA2mQwISr46pD6E5iqkWg02RAs8vyTT/j0RTnoYmeXauBuSv1qKwR179g==",
+      "dev": true,
+      "requires": {
+        "follow-redirects": "1.5.10",
+        "is-buffer": "^2.0.2"
+      },
+      "dependencies": {
+        "debug": {
+          "version": "3.1.0",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-3.1.0.tgz",
+          "integrity": "sha512-OX8XqP7/1a9cqkxYw2yXss15f26NKWBpDXQd0/uK/KPqdQhxbPa994hnzjcE2VqQpDslf55723cKPUOGSmMY3g==",
+          "dev": true,
+          "requires": {
+            "ms": "2.0.0"
+          }
+        },
+        "follow-redirects": {
+          "version": "1.5.10",
+          "resolved": "https://registry.npmjs.org/follow-redirects/-/follow-redirects-1.5.10.tgz",
+          "integrity": "sha512-0V5l4Cizzvqt5D44aTXbFZz+FtyXV1vrDN6qrelxtfYQKW0KO0W2T/hkE8xvGa/540LkZlkaUjO4ailYTFtHVQ==",
+          "dev": true,
+          "requires": {
+            "debug": "=3.1.0"
+          }
+        },
+        "is-buffer": {
+          "version": "2.0.4",
+          "resolved": "https://registry.npmjs.org/is-buffer/-/is-buffer-2.0.4.tgz",
+          "integrity": "sha512-Kq1rokWXOPXWuaMAqZiJW4XxsmD9zGx9q4aePabbn3qCRGedtH7Cm+zV8WETitMfu1wdh+Rvd6w5egwSngUX2A==",
+          "dev": true
+        }
+      }
+    },
    "babel-code-frame": {
      "version": "6.26.0",
      "resolved": "https://registry.npmjs.org/babel-code-frame/-/babel-code-frame-6.26.0.tgz",
@ -4258,6 +4294,16 @@
      "integrity": "sha512-vyL2OymJxmarO8gxMr0mhChsO9QGwhynfuu4+MHTAW6czfq9humCB7rKpUjDd9YUiDPU4mzpyupFSvOClAwbmQ==",
      "dev": true
    },
+    "binary": {
+      "version": "0.3.0",
+      "resolved": "https://registry.npmjs.org/binary/-/binary-0.3.0.tgz",
+      "integrity": "sha1-n2BVO8XOjDOG87VTz/R0Yq3sqnk=",
+      "dev": true,
+      "requires": {
+        "buffers": "~0.1.1",
+        "chainsaw": "~0.1.0"
+      }
+    },
    "binary-extensions": {
      "version": "1.13.1",
      "resolved": "https://registry.npmjs.org/binary-extensions/-/binary-extensions-1.13.1.tgz",
@ -4478,6 +4524,12 @@
      "integrity": "sha1-JuYe0UIvtw3ULm42cp7VHYVf6Nk=",
      "dev": true
    },
+    "buffers": {
+      "version": "0.1.1",
+      "resolved": "https://registry.npmjs.org/buffers/-/buffers-0.1.1.tgz",
+      "integrity": "sha1-skV5w77U1tOWru5tmorn9Ugqt7s=",
+      "dev": true
+    },
    "builtin-status-codes": {
      "version": "3.0.0",
      "resolved": "https://registry.npmjs.org/builtin-status-codes/-/builtin-status-codes-3.0.0.tgz",
@ -4622,6 +4674,16 @@
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      "dev": true
    },
+    "camel-case": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/camel-case/-/camel-case-3.0.0.tgz",
+      "integrity": "sha1-yjw2iKTpzzpM2nd9xNy8cTJJz3M=",
+      "dev": true,
+      "requires": {
+        "no-case": "^2.2.0",
+        "upper-case": "^1.1.1"
+      }
+    },
    "camelcase": {
      "version": "5.3.1",
      "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-5.3.1.tgz",
@ -4746,6 +4808,15 @@
        }
      }
    },
+    "chainsaw": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/chainsaw/-/chainsaw-0.1.0.tgz",
+      "integrity": "sha1-XqtQsor+WAdNDVgpE4iCi15fvJg=",
+      "dev": true,
+      "requires": {
+        "traverse": ">=0.3.0 <0.4"
+      }
+    },
    "chalk": {
      "version": "2.4.2",
      "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.2.tgz",
@ -4763,6 +4834,76 @@
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      "dev": true
    },
+    "cheerio": {
+      "version": "0.22.0",
+      "resolved": "https://registry.npmjs.org/cheerio/-/cheerio-0.22.0.tgz",
+      "integrity": "sha1-qbqoYKP5tZWmuBsahocxIe06Jp4=",
+      "dev": true,
+      "requires": {
+        "css-select": "~1.2.0",
+        "dom-serializer": "~0.1.0",
+        "entities": "~1.1.1",
+        "htmlparser2": "^3.9.1",
+        "lodash.assignin": "^4.0.9",
+        "lodash.bind": "^4.1.4",
+        "lodash.defaults": "^4.0.1",
+        "lodash.filter": "^4.4.0",
+        "lodash.flatten": "^4.2.0",
+        "lodash.foreach": "^4.3.0",
+        "lodash.map": "^4.4.0",
+        "lodash.merge": "^4.4.0",
+        "lodash.pick": "^4.2.1",
+        "lodash.reduce": "^4.4.0",
+        "lodash.reject": "^4.4.0",
+        "lodash.some": "^4.4.0"
+      },
+      "dependencies": {
+        "css-select": {
+          "version": "1.2.0",
+          "resolved": "https://registry.npmjs.org/css-select/-/css-select-1.2.0.tgz",
+          "integrity": "sha1-KzoRBTnFNV8c2NMUYj6HCxIeyFg=",
+          "dev": true,
+          "requires": {
+            "boolbase": "~1.0.0",
+            "css-what": "2.1",
+            "domutils": "1.5.1",
+            "nth-check": "~1.0.1"
+          }
+        },
+        "css-what": {
+          "version": "2.1.3",
+          "resolved": "https://registry.npmjs.org/css-what/-/css-what-2.1.3.tgz",
+          "integrity": "sha512-a+EPoD+uZiNfh+5fxw2nO9QwFa6nJe2Or35fGY6Ipw1R3R4AGz1d1TEZrCegvw2YTmZ0jXirGYlzxxpYSHwpEg==",
+          "dev": true
+        },
+        "dom-serializer": {
+          "version": "0.1.1",
+          "resolved": "https://registry.npmjs.org/dom-serializer/-/dom-serializer-0.1.1.tgz",
+          "integrity": "sha512-l0IU0pPzLWSHBcieZbpOKgkIn3ts3vAh7ZuFyXNwJxJXk/c4Gwj9xaTJwIDVQCXawWD0qb3IzMGH5rglQaO0XA==",
+          "dev": true,
+          "requires": {
+            "domelementtype": "^1.3.0",
+            "entities": "^1.1.1"
+          }
+        },
+        "domutils": {
+          "version": "1.5.1",
+          "resolved": "https://registry.npmjs.org/domutils/-/domutils-1.5.1.tgz",
+          "integrity": "sha1-3NhIiib1Y9YQeeSMn3t+Mjc2gs8=",
+          "dev": true,
+          "requires": {
+            "dom-serializer": "0",
+            "domelementtype": "1"
+          }
+        },
+        "entities": {
+          "version": "1.1.2",
+          "resolved": "https://registry.npmjs.org/entities/-/entities-1.1.2.tgz",
+          "integrity": "sha512-f2LZMYl1Fzu7YSBKg+RoROelpOaNrcGmE9AZubeDfrCEia483oW4MI4VyFd5VNHIgQ/7qm1I0wUHK1eJnn2y2w==",
+          "dev": true
+        }
+      }
+    },
    "chokidar": {
      "version": "2.1.8",
      "resolved": "https://registry.npmjs.org/chokidar/-/chokidar-2.1.8.tgz",
@ -4843,6 +4984,23 @@
        }
      }
    },
+    "clean-css": {
+      "version": "4.2.1",
+      "resolved": "https://registry.npmjs.org/clean-css/-/clean-css-4.2.1.tgz",
+      "integrity": "sha512-4ZxI6dy4lrY6FHzfiy1aEOXgu4LIsW2MhwG0VBKdcoGoH/XLFgaHSdLTGr4O8Be6A8r3MOphEiI8Gc1n0ecf3g==",
+      "dev": true,
+      "requires": {
+        "source-map": "~0.6.0"
+      },
+      "dependencies": {
+        "source-map": {
+          "version": "0.6.1",
+          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
+          "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
+          "dev": true
+        }
+      }
+    },
    "clean-stack": {
      "version": "2.2.0",
      "resolved": "https://registry.npmjs.org/clean-stack/-/clean-stack-2.2.0.tgz",
@ -7193,6 +7351,15 @@
        "esutils": "^2.0.2"
      }
    },
+    "dom-converter": {
+      "version": "0.2.0",
+      "resolved": "https://registry.npmjs.org/dom-converter/-/dom-converter-0.2.0.tgz",
+      "integrity": "sha512-gd3ypIPfOMr9h5jIKq8E3sHOTCjeirnl0WK5ZdS1AW0Odt0b1PaWaHdJ4Qk4klv+YB9aJBS7mESXjFoDQPu6DA==",
+      "dev": true,
+      "requires": {
+        "utila": "~0.4"
+      }
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    "dom-serialize": {
      "version": "2.2.1",
      "resolved": "https://registry.npmjs.org/dom-serialize/-/dom-serialize-2.2.1.tgz",
@ -7235,6 +7402,15 @@
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      "dev": true
    },
+    "domhandler": {
+      "version": "2.4.2",
+      "resolved": "https://registry.npmjs.org/domhandler/-/domhandler-2.4.2.tgz",
+      "integrity": "sha512-JiK04h0Ht5u/80fdLMCEmV4zkNh2BcoMFBmZ/91WtYZ8qVXSKjiw7fXMgFPnHcSZgOo3XdinHvmnDUeMf5R4wA==",
+      "dev": true,
+      "requires": {
+        "domelementtype": "1"
+      }
+    },
    "domutils": {
      "version": "1.7.0",
      "resolved": "https://registry.npmjs.org/domutils/-/domutils-1.7.0.tgz",
@ -8085,6 +8261,17 @@
        "chardet": "^0.7.0",
        "iconv-lite": "^0.4.24",
        "tmp": "^0.0.33"
+      },
+      "dependencies": {
+        "tmp": {
+          "version": "0.0.33",
+          "resolved": "https://registry.npmjs.org/tmp/-/tmp-0.0.33.tgz",
+          "integrity": "sha512-jRCJlojKnZ3addtTOjdIqoRuPEKBvNXcGYqzO6zWZX8KfKEpnGY5jfggJQ3EjKuu8D4bJRr0y+cYJFmYbImXGw==",
+          "dev": true,
+          "requires": {
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+          }
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      }
    },
    "extglob": {
@ -9030,6 +9217,18 @@
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      }
    },
+    "fstream": {
+      "version": "1.0.12",
+      "resolved": "https://registry.npmjs.org/fstream/-/fstream-1.0.12.tgz",
+      "integrity": "sha512-WvJ193OHa0GHPEL+AycEJgxvBEwyfRkN1vhjca23OaPVMCaLCXTd5qAu82AjTcgP1UJmytkOKb63Ypde7raDIg==",
+      "dev": true,
+      "requires": {
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+        "inherits": "~2.0.0",
+        "mkdirp": ">=0.5 0",
+        "rimraf": "2"
+      }
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@ -9499,9 +9698,9 @@
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@ -9777,6 +9976,12 @@
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      }
    },
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+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/he/-/he-1.2.0.tgz",
+      "integrity": "sha512-F/1DnUGPopORZi0ni+CvrCgHQ5FyEAHRLSApuYWMmrbSwoN2Mn/7k+Gl38gJnR7yyDZk6WLXwiGod1JOWNDKGw==",
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    "hex-color-regex": {
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+        "clean-css": "4.2.x",
+        "commander": "2.17.x",
+        "he": "1.2.x",
+        "param-case": "2.1.x",
+        "relateurl": "0.2.x",
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+      },
+      "dependencies": {
+        "isarray": {
+          "version": "0.0.1",
+          "resolved": "https://registry.npmjs.org/isarray/-/isarray-0.0.1.tgz",
+          "integrity": "sha1-ihis/Kmo9Bd+Cav8YDiTmwXR7t8=",
+          "dev": true
+        },
+        "readable-stream": {
+          "version": "1.0.34",
+          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-1.0.34.tgz",
+          "integrity": "sha1-Elgg40vIQtLyqq+v5MKRbuMsFXw=",
+          "dev": true,
+          "requires": {
+            "core-util-is": "~1.0.0",
+            "inherits": "~2.0.1",
+            "isarray": "0.0.1",
+            "string_decoder": "~0.10.x"
+          }
+        },
+        "string_decoder": {
+          "version": "0.10.31",
+          "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-0.10.31.tgz",
+          "integrity": "sha1-YuIDvEF2bGwoyfyEMB2rHFMQ+pQ=",
+          "dev": true
+        }
+      }
+    },
    "snapdragon": {
      "version": "0.8.2",
      "resolved": "https://registry.npmjs.org/snapdragon/-/snapdragon-0.8.2.tgz",
@ -18970,12 +19666,12 @@
      "dev": true
    },
    "tmp": {
-      "version": "0.0.33",
-      "resolved": "https://registry.npmjs.org/tmp/-/tmp-0.0.33.tgz",
-      "integrity": "sha512-jRCJlojKnZ3addtTOjdIqoRuPEKBvNXcGYqzO6zWZX8KfKEpnGY5jfggJQ3EjKuu8D4bJRr0y+cYJFmYbImXGw==",
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/tmp/-/tmp-0.1.0.tgz",
+      "integrity": "sha512-J7Z2K08jbGcdA1kkQpJSqLF6T0tdQqpR2pnSUXsIchbPdTI9v3e85cLW0d6WDhwuAleOV71j2xWs8qMPfK7nKw==",
      "dev": true,
      "requires": {
-        "os-tmpdir": "~1.0.2"
+        "rimraf": "^2.6.3"
      }
    },
    "to-array": {
@ -19067,6 +19763,12 @@
        }
      }
    },
+    "traverse": {
+      "version": "0.3.9",
+      "resolved": "https://registry.npmjs.org/traverse/-/traverse-0.3.9.tgz",
+      "integrity": "sha1-cXuPIgzAu3tE5AUUwisui7xw2Lk=",
+      "dev": true
+    },
    "trim-newlines": {
      "version": "1.0.0",
      "resolved": "https://registry.npmjs.org/trim-newlines/-/trim-newlines-1.0.0.tgz",
@ -19181,6 +19883,12 @@
      "integrity": "sha512-UIEXBNeYmKptWH6z8ZnqTeS8fV74zG0/eRU9VGkpzz+LIJNs8W/zM/L+7ctCkRrgbNnnR0xxw4bKOr0cW0N0Og==",
      "dev": true
    },
+    "underscore": {
+      "version": "1.9.2",
+      "resolved": "https://registry.npmjs.org/underscore/-/underscore-1.9.2.tgz",
+      "integrity": "sha512-D39qtimx0c1fI3ya1Lnhk3E9nONswSKhnffBI0gME9C99fYOkNi04xs8K6pePLhvl1frbDemkaBQ5ikWllR2HQ==",
+      "dev": true
+    },
    "unicode-canonical-property-names-ecmascript": {
      "version": "1.0.4",
      "resolved": "https://registry.npmjs.org/unicode-canonical-property-names-ecmascript/-/unicode-canonical-property-names-ecmascript-1.0.4.tgz",
@ -19315,6 +20023,12 @@
      "integrity": "sha512-aZwGpamFO61g3OlfT7OQCHqhGnW43ieH9WZeP7QxN/G/jS4jfqUkZxoryvJgVPEcrl5NL/ggHsSmLMHuH64Lhg==",
      "dev": true
    },
+    "upper-case": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/upper-case/-/upper-case-1.1.3.tgz",
+      "integrity": "sha1-9rRQHC7EzdJrp4vnIilh3ndiFZg=",
+      "dev": true
+    },
    "uri-js": {
      "version": "4.2.2",
      "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.2.2.tgz",
@ -19368,6 +20082,17 @@
      "requires": {
        "lru-cache": "4.1.x",
        "tmp": "0.0.x"
+      },
+      "dependencies": {
+        "tmp": {
+          "version": "0.0.33",
+          "resolved": "https://registry.npmjs.org/tmp/-/tmp-0.0.33.tgz",
+          "integrity": "sha512-jRCJlojKnZ3addtTOjdIqoRuPEKBvNXcGYqzO6zWZX8KfKEpnGY5jfggJQ3EjKuu8D4bJRr0y+cYJFmYbImXGw==",
+          "dev": true,
+          "requires": {
+            "os-tmpdir": "~1.0.2"
+          }
+        }
      }
    },
    "util": {
@ -19395,6 +20120,12 @@
        "object.getownpropertydescriptors": "^2.0.3"
      }
    },
+    "utila": {
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/utila/-/utila-0.4.0.tgz",
+      "integrity": "sha1-ihagXURWV6Oupe7MWxKk+lN5dyw=",
+      "dev": true
+    },
    "utils-merge": {
      "version": "1.0.1",
      "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
--- a/package.json
+++ b/package.json
@ -1,6 +1,6 @@
 {
  "name": "uni2work",
-  "version": "10.1.0",
+  "version": "10.3.0",
  "description": "",
  "keywords": [],
  "author": "",
@ -74,6 +74,8 @@
    "css-loader": "^2.1.1",
    "eslint": "^5.16.0",
    "file-loader": "^5.0.2",
+    "glob": "^7.1.6",
+    "html-webpack-plugin": "^3.2.0",
    "husky": "^2.7.0",
    "jasmine-core": "^3.5.0",
    "js-yaml": "^3.13.1",
@ -92,6 +94,8 @@
    "optimize-css-assets-webpack-plugin": "^5.0.3",
    "postcss-loader": "^3.0.0",
    "postcss-preset-env": "^6.7.0",
+    "real-favicon-webpack-plugin": "^0.2.3",
+    "remove-files-webpack-plugin": "^1.1.3",
    "resolve-url-loader": "^3.1.1",
    "sass": "^1.23.7",
    "sass-loader": "^7.3.1",
@ -99,6 +103,7 @@
    "standard-version": "^6.0.1",
    "style-loader": "^0.23.1",
    "terser-webpack-plugin": "^2.2.3",
+    "tmp": "^0.1.0",
    "typeface-roboto": "0.0.75",
    "typeface-source-sans-pro": "0.0.75",
    "webpack": "^4.41.2",
@ -110,6 +115,7 @@
    "@babel/runtime": "^7.7.6",
    "@juggle/resize-observer": "^2.5.0",
    "core-js": "^3.4.8",
+    "lodash.throttle": "^4.1.1",
    "moment": "^2.24.0",
    "npm": "^6.13.4",
    "tail.datetime": "git+ssh://git@gitlab2.rz.ifi.lmu.de/uni2work/tail.DateTime.git#master",
--- a/package.yaml
+++ b/package.yaml
@ -1,5 +1,5 @@
 name:    uniworx
-version: 10.1.0
+version: 10.3.0

 dependencies:
  - base
--- a/records.json
+++ b/records.json
@ -739,5 +739,31 @@
        "usedIds": []
      }
    }
+  ],
+  "app-manifest-webpack-plugin for \"/home/gkleen/projects/uni2work/static/wp-4.41/iconstats-[hash].json\"": [
+    {
+      "modules": {
+        "byIdentifier": {},
+        "usedIds": {}
+      },
+      "chunks": {
+        "byName": {},
+        "bySource": {},
+        "usedIds": []
+      }
+    }
+  ],
+  "app-manifest-webpack-plugin for \"../../config/favicon.json\"": [
+    {
+      "modules": {
+        "byIdentifier": {},
+        "usedIds": {}
+      },
+      "chunks": {
+        "byName": {},
+        "bySource": {},
+        "usedIds": []
+      }
+    }
  ]
 }
--- a/6
+++ b/6
@ -39,8 +39,6 @@
 /static StaticR EmbeddedStatic appStatic                      !free
 /auth   AuthR   Auth   getAuth                                !free

-/favicon.ico FaviconR GET                                     !free
-/robots.txt  RobotsR  GET                                     !free
 /metrics     MetricsR GET

 /                             HomeR            GET            !free
@ -175,6 +173,7 @@
    /users/new                  EAddUserR      GET POST
    /users/invite               EInviteR       GET POST
    /register                   ERegisterR         POST        !timeANDcourse-registeredAND¬exam-registered !timeANDexam-registeredAND¬exam-result
+    /register/#ExamOccurrenceName ERegisterOccR    POST        !exam-occurrence-registrationANDtimeANDcapacityANDcourse-registeredAND¬exam-occurrence-registered !exam-occurrence-registrationANDtimeANDexam-occurrence-registeredAND¬exam-result
    /grades                     EGradesR       GET POST        !exam-office
  /apps                         CApplicationsR GET POST
  !/apps/files                  CAppsFilesR    GET
@ -204,6 +203,7 @@
 /msgs                           MessageListR GET POST
 /msg/#{CryptoUUIDSystemMessage} MessageR      GET POST        !timeANDreadANDauthentication

-
 !/#UUID CryptoUUIDDispatchR GET                               !free -- just redirect
 -- !/*{CI FilePath} CryptoFileNameDispatchR GET                  !free -- Disabled until preliminary check for valid cID exists
+
+!/*WellKnownFileName WellKnownR GET !free
--- a/shell.nix
+++ b/shell.nix
@ -19,7 +19,7 @@ let
  '';

  override = oldAttrs: {
-  nativeBuildInputs = oldAttrs.nativeBuildInputs ++ (with pkgs; [ nodejs-12_x postgresql openldap google-chrome ]) ++ (with haskellPackages; [ stack yesod-bin hlint cabal-install weeder ]);
+  nativeBuildInputs = oldAttrs.nativeBuildInputs ++ (with pkgs; [ nodejs-12_x postgresql openldap google-chrome exiftool ]) ++ (with haskellPackages; [ stack yesod-bin hlint cabal-install weeder ]);
    shellHook = ''
      export PROMPT_INFO="${oldAttrs.name}"

--- a/src/Application.hs
+++ b/src/Application.hs
@ -101,7 +101,6 @@ import Data.List (cycle)

 -- Import all relevant handler modules here.
 -- (HPack takes care to add new modules to our cabal file nowadays.)
-import Handler.Common
 import Handler.Home
 import Handler.Info
 import Handler.Help
@ -194,7 +193,7 @@ makeFoundation appSettings'@AppSettings{..} = do

    runAppLoggingT tempFoundation $ do
      $logInfoS "InstanceID" $ UUID.toText appInstanceID
-      -- logDebugS "Configuration" $ tshow appSettings'
+      $logDebugS "Configuration" $ tshow appSettings'

      smtpPool <- for appSmtpConf $ \c -> do
        $logDebugS "setup" "SMTP-Pool"
--- a/src/Foundation.hs
+++ b/src/Foundation.hs
@ -504,9 +504,9 @@ tagAccessPredicate AuthTime = APDB $ \mAuthId route _ -> case route of
    course <- $cachedHereBinary (tid, ssh, csh) . MaybeT . getKeyBy $ TermSchoolCourseShort tid ssh csh
    Entity eId Exam{..} <- $cachedHereBinary (course, examn) . MaybeT . getBy $ UniqueExam course examn
    cTime <- liftIO getCurrentTime
-    registered <- case mAuthId of
-      Just uid -> $cachedHereBinary (eId, uid) . lift . existsBy $ UniqueExamRegistration eId uid
-      Nothing  -> return False
+    registration <- case mAuthId of
+      Just uid -> $cachedHereBinary (eId, uid) . lift . getBy $ UniqueExamRegistration eId uid
+      Nothing  -> return Nothing

    let visible = NTop examVisibleFrom <= NTop (Just cTime)

@ -515,11 +515,23 @@ tagAccessPredicate AuthTime = APDB $ \mAuthId route _ -> case route of
      EUsersR    -> guard $ NTop examStart <= NTop (Just cTime)
                         && NTop (Just cTime) <= NTop examFinished
      ERegisterR
-        | not registered -> guard $ visible
-                                 && NTop examRegisterFrom <= NTop (Just cTime)
-                                 && NTop (Just cTime) <= NTop examRegisterTo
-        | otherwise      -> guard $ visible
-                                 && NTop (Just cTime) <= NTop examDeregisterUntil
+        | is _Nothing registration
+          -> guard $ visible
+                  && NTop examRegisterFrom <= NTop (Just cTime)
+                  && NTop (Just cTime) <= NTop examRegisterTo
+        | otherwise
+          -> guard $ visible
+                  && NTop (Just cTime) <= NTop examDeregisterUntil
+      ERegisterOccR occn -> do
+        occId <- (>>= hoistMaybe) . $cachedHereBinary (eId, occn) . lift . getKeyBy $ UniqueExamOccurrence eId occn
+        if
+          | (registration >>= examRegistrationOccurrence . entityVal) == Just occId
+            -> guard $ visible
+                    && NTop (Just cTime) <= NTop examDeregisterUntil
+          | otherwise
+            -> guard $ visible
+                    && NTop examRegisterFrom <= NTop (Just cTime)
+                    && NTop (Just cTime) <= NTop examRegisterTo
      _          -> return ()

    return Authorized
@ -758,6 +770,59 @@ tagAccessPredicate AuthTutorialRegistered = APDB $ \mAuthId route _ -> case rout
    guardMExceptT isRegistered (unauthorizedI MsgUnauthorizedRegistered)
    return Authorized
  r -> $unsupportedAuthPredicate AuthTutorialRegistered r
+tagAccessPredicate AuthExamOccurrenceRegistration = APDB $ \_ route _ -> case route of
+  CExamR tid ssh csh examn _ -> exceptT return return $ do
+    isOccurrenceRegistration <- $cachedHereBinary (tid, ssh, csh, examn) . lift . E.selectExists . E.from $ \(course `E.InnerJoin` exam) -> do
+      E.on $ course E.^. CourseId E.==. exam E.^. ExamCourse
+      E.where_ $ course E.^. CourseTerm       E.==. E.val tid
+           E.&&. course E.^. CourseSchool     E.==. E.val ssh
+           E.&&. course E.^. CourseShorthand  E.==. E.val csh
+           E.&&. exam E.^. ExamName           E.==. E.val examn
+           E.&&. exam E.^. ExamOccurrenceRule E.==. E.val ExamRoomFifo
+    guardMExceptT isOccurrenceRegistration (unauthorizedI MsgUnauthorizedExamOccurrenceRegistration)
+    return Authorized
+  r -> $unsupportedAuthPredicate AuthExamOccurrenceRegistration r
+tagAccessPredicate AuthExamOccurrenceRegistered = APDB $ \mAuthId route _ -> case route of
+  CExamR tid ssh csh examn (ERegisterOccR occn) -> exceptT return return $ do
+    authId <- maybeExceptT AuthenticationRequired $ return mAuthId
+    hasRegistration <- $cachedHereBinary (authId, tid, ssh, csh, examn, occn) . lift . E.selectExists . E.from $ \(course `E.InnerJoin` exam `E.InnerJoin` examRegistration `E.InnerJoin` examOccurrence) -> do
+      E.on $ E.just (examOccurrence E.^. ExamOccurrenceId) E.==. examRegistration E.^. ExamRegistrationOccurrence
+      E.on $ exam E.^. ExamId E.==. examRegistration E.^. ExamRegistrationExam
+      E.on $ course E.^. CourseId E.==. exam E.^. ExamCourse
+      E.where_ $ examRegistration E.^. ExamRegistrationUser E.==. E.val authId
+           E.&&. examOccurrence E.^. ExamOccurrenceName E.==. E.val occn
+           E.&&. course E.^. CourseTerm      E.==. E.val tid
+           E.&&. course E.^. CourseSchool    E.==. E.val ssh
+           E.&&. course E.^. CourseShorthand E.==. E.val csh
+           E.&&. exam E.^. ExamName          E.==. E.val examn
+    guardMExceptT hasRegistration (unauthorizedI MsgUnauthorizedRegistered)
+    return Authorized
+  CExamR tid ssh csh examn _ -> exceptT return return $ do
+    authId <- maybeExceptT AuthenticationRequired $ return mAuthId
+    hasRegistration <- $cachedHereBinary (authId, tid, ssh, csh, examn) . lift . E.selectExists . E.from $ \(course `E.InnerJoin` exam `E.InnerJoin` examRegistration) -> do
+      E.on $ exam E.^. ExamId E.==. examRegistration E.^. ExamRegistrationExam
+      E.on $ course E.^. CourseId E.==. exam E.^. ExamCourse
+      E.where_ $ examRegistration E.^. ExamRegistrationUser E.==. E.val authId
+           E.&&. course E.^. CourseTerm      E.==. E.val tid
+           E.&&. course E.^. CourseSchool    E.==. E.val ssh
+           E.&&. course E.^. CourseShorthand E.==. E.val csh
+           E.&&. exam E.^. ExamName          E.==. E.val examn
+           E.&&. E.not_ (E.isNothing $ examRegistration E.^. ExamRegistrationOccurrence)
+    guardMExceptT hasRegistration (unauthorizedI MsgUnauthorizedRegistered)
+    return Authorized
+  CourseR tid ssh csh _ -> exceptT return return $ do
+    authId <- maybeExceptT AuthenticationRequired $ return mAuthId
+    hasRegistration <- $cachedHereBinary (authId, tid, ssh, csh) . lift . E.selectExists . E.from $ \(course `E.InnerJoin` exam `E.InnerJoin` examRegistration) -> do
+      E.on $ exam E.^. ExamId E.==. examRegistration E.^. ExamRegistrationExam
+      E.on $ course E.^. CourseId E.==. exam E.^. ExamCourse
+      E.where_ $ examRegistration E.^. ExamRegistrationUser E.==. E.val authId
+           E.&&. course E.^. CourseTerm      E.==. E.val tid
+           E.&&. course E.^. CourseSchool    E.==. E.val ssh
+           E.&&. course E.^. CourseShorthand E.==. E.val csh
+           E.&&. E.not_ (E.isNothing $ examRegistration E.^. ExamRegistrationOccurrence)
+    guardMExceptT hasRegistration (unauthorizedI MsgUnauthorizedRegistered)
+    return Authorized
+  r -> $unsupportedAuthPredicate AuthExamOccurrenceRegistered r
 tagAccessPredicate AuthExamRegistered = APDB $ \mAuthId route _ -> case route of
  CExamR tid ssh csh examn _ -> exceptT return return $ do
    authId <- maybeExceptT AuthenticationRequired $ return mAuthId
@ -768,7 +833,7 @@ tagAccessPredicate AuthExamRegistered = APDB $ \mAuthId route _ -> case route of
           E.&&. course E.^. CourseTerm      E.==. E.val tid
           E.&&. course E.^. CourseSchool    E.==. E.val ssh
           E.&&. course E.^. CourseShorthand E.==. E.val csh
-           E.&&. exam E.^. ExamName  E.==. E.val examn
+           E.&&. exam E.^. ExamName          E.==. E.val examn
    guardMExceptT hasRegistration (unauthorizedI MsgUnauthorizedRegistered)
    return Authorized
  CourseR tid ssh csh _ -> exceptT return return $ do
@ -933,6 +998,13 @@ tagAccessPredicate AuthApplicant = APDB $ \mAuthId route _ -> case route of
           E.&&. course E.^. CourseSchool    E.==. E.val ssh
           E.&&. course E.^. CourseShorthand E.==. E.val csh
 tagAccessPredicate AuthCapacity = APDB $ \_ route _ -> case route of
+  CExamR tid ssh csh examn (ERegisterOccR occn) -> maybeT (unauthorizedI MsgExamOccurrenceNoCapacity) $ do
+    cid <- $cachedHereBinary (tid, ssh, csh) . MaybeT . getKeyBy $ TermSchoolCourseShort tid ssh csh
+    eid <- $cachedHereBinary (cid, examn) . MaybeT . getKeyBy $ UniqueExam cid examn
+    Entity occId ExamOccurrence{..} <- $cachedHereBinary (eid, occn) . MaybeT . getBy $ UniqueExamOccurrence eid occn
+    registered <- $cachedHereBinary occId . lift $ fromIntegral <$> count [ ExamRegistrationOccurrence ==. Just occId, ExamRegistrationExam ==. eid ]
+    guard $ examOccurrenceCapacity > registered
+    return Authorized
  CTutorialR tid ssh csh tutn _ -> maybeT (unauthorizedI MsgTutorialNoCapacity) $ do
    cid <- $cachedHereBinary (tid, ssh, csh) . MaybeT . getKeyBy $ TermSchoolCourseShort tid ssh csh
    Entity tutId Tutorial{..} <- $cachedHereBinary (cid, tutn) . MaybeT . getBy $ UniqueTutorial cid tutn
@ -1574,18 +1646,9 @@ siteLayout' headingOverride widget = do
  frontendDatetimeLocale <- toJSON <$> selectLanguage frontendDatetimeLocales

  pc <- widgetToPageContent $ do
-      $logDebugS "siteLayout" $ tshow webpackEntrypoint_main
-      forM_ webpackEntrypoint_main $ \(sRoute, mime) ->
-        let ctEq = (==) `on` simpleContentType
-         in if
-              | mime `ctEq` "text/css"
-                -> addStylesheet $ StaticR sRoute
-              | mime `ctEq` "application/javascript"
-                -> addScript $ StaticR sRoute
-              | otherwise
-                -> $logErrorS "siteLayout" [st|Unknown mime type in webpack bundle: #{tshow mime}|]
-
+      webpackLinks_main StaticR
      toWidget $(juliusFile "templates/i18n.julius")
+      wellKnownHtmlLinks

      $(widgetFile "default-layout")
  withUrlRenderer $(hamletFile "templates/default-layout-wrapper.hamlet")
@ -1636,8 +1699,7 @@ i18nCrumb msg mbR = do
 instance YesodBreadcrumbs UniWorX where
  breadcrumb (AuthR _)        = i18nCrumb MsgMenuLogin         $ Just HomeR
  breadcrumb (StaticR _)      = i18nCrumb MsgBreadcrumbStatic    Nothing
-  breadcrumb FaviconR         = i18nCrumb MsgBreadcrumbFavicon   Nothing
-  breadcrumb RobotsR          = i18nCrumb MsgBreadcrumbRobots    Nothing
+  breadcrumb (WellKnownR _)   = i18nCrumb MsgBreadcrumbWellKnown Nothing
  breadcrumb MetricsR         = i18nCrumb MsgBreadcrumbMetrics   Nothing

  breadcrumb HomeR            = i18nCrumb MsgMenuHome      Nothing
@ -1801,6 +1863,7 @@ instance YesodBreadcrumbs UniWorX where
    ECInviteR  -> i18nCrumb MsgBreadcrumbExamCorrectorInvite . Just $ CExamR tid ssh csh examn EShowR
    EInviteR   -> i18nCrumb MsgBreadcrumbExamParticipantInvite . Just $ CExamR tid ssh csh examn EShowR
    ERegisterR -> i18nCrumb MsgBreadcrumbExamRegister . Just $ CExamR tid ssh csh examn EShowR
+    ERegisterOccR _occn -> i18nCrumb MsgBreadcrumbExamRegister . Just $ CExamR tid ssh csh examn EShowR

  breadcrumb (CourseR tid ssh csh (TutorialR tutn sRoute)) = case sRoute of
    TUsersR  -> maybeT (i18nCrumb MsgBreadcrumbTutorial . Just $ CourseR tid ssh csh CTutorialListR) $ do
--- a/src/Handler/Common.hs
+++ b/src/Handler/Common.hs
@ -1,29 +0,0 @@
-- | Common handler functions.
-module Handler.Common
-  ( getFaviconR
-  , getRobotsR
-  ) where
-
-import Data.FileEmbed (embedFile)
-import Import hiding (embedFile)
-
-- These handlers embed files in the executable at compile time to avoid a
-- runtime dependency, and for efficiency.
-
-getFaviconR :: Handler TypedContent
-getFaviconR = do
-  let content = $(embedFile "static/favicon.ico")
-
-  setEtagHashable content
-
-  return $ TypedContent "image/x-icon"
-         $ toContent content
-
-getRobotsR :: Handler TypedContent
-getRobotsR = do
-  let content = $(embedFile "static/robots.txt")
-
-  setEtagHashable content
-  
-  return $ TypedContent typePlain
-         $ toContent content
--- a/src/Handler/Course/Show.hs
+++ b/src/Handler/Course/Show.hs
@ -113,7 +113,9 @@ getCShowR tid ssh csh = do
    | otherwise
      -> return . modal $(widgetFile "course/login-to-register") . Left . SomeRoute $ AuthR LoginR
  registrationOpen <- hasWriteAccessTo $ CourseR tid ssh csh CRegisterR
-
+  
+  MsgRenderer mr <- getMsgRenderer
+  
  let
    tutorialDBTable = DBTable{..}
      where
@ -151,7 +153,7 @@ getCShowR tid ssh csh = do
                                     E.where_ $ participant E.^. TutorialParticipantTutorial E.==. E.val tutid
                                in return $ E.val tutorialCapacity' E.-. numParticipants
                return . toWidget $ tshow freeCapacity
-          , sortable Nothing mempty $ \DBRow{ dbrOutput = Entity tutId Tutorial{..} } -> sqlCell $ do
+          , sortable Nothing (mempty & cellAttrs <>~ pure ("uw-hide-columns--hider-label", mr MsgActionsHead)) $ \DBRow{ dbrOutput = Entity tutId Tutorial{..} } -> sqlCell $ do
              mayRegister <- (== Authorized) <$> evalAccessDB (CTutorialR tid ssh csh tutorialName TRegisterR) True
              isRegistered <- case mbAid of
                Nothing  -> return False
--- a/src/Handler/Exam/Form.hs
+++ b/src/Handler/Exam/Form.hs
@ -39,7 +39,7 @@ data ExamForm = ExamForm
  , efPublicStatistics :: Bool
  , efGradingRule :: Maybe ExamGradingRule
  , efBonusRule :: Maybe ExamBonusRule
-  , efOccurrenceRule :: Maybe ExamOccurrenceRule
+  , efOccurrenceRule :: ExamOccurrenceRule
  , efCorrectors :: Set (Either UserEmail UserId)
  , efExamParts :: Set ExamPartForm
  }
@ -96,7 +96,7 @@ examForm template html = do
    <*> apopt checkBoxField (fslI MsgExamPublicStatistics & setTooltip MsgExamPublicStatisticsTip) (efPublicStatistics <$> template <|> Just True)
    <*> optionalActionA (examGradingRuleForm $ efGradingRule =<< template) (fslI MsgExamAutomaticGrading & setTooltip MsgExamAutomaticGradingTip) (is _Just . efGradingRule <$> template)
    <*> optionalActionA (examBonusRuleForm $ efBonusRule =<< template) (fslI MsgExamBonus) (is _Just . efBonusRule <$> template)
-    <*> optionalActionA (examOccurrenceRuleForm $ efOccurrenceRule =<< template) (fslI MsgExamAutomaticOccurrenceAssignment & setTooltip MsgExamAutomaticOccurrenceAssignmentTip) (is _Just . efOccurrenceRule <$> template)
+    <*> (examOccurrenceRuleForm $ efOccurrenceRule <$> template)
    <*  aformSection MsgExamFormCorrection
    <*> examCorrectorsForm (efCorrectors <$> template)
    <*  aformSection MsgExamFormParts
--- a/src/Handler/Exam/Register.hs
+++ b/src/Handler/Exam/Register.hs
@ -1,6 +1,7 @@
 module Handler.Exam.Register
  ( ButtonExamRegister(..)
  , postERegisterR
+  , postERegisterOccR
  ) where

 import Import
@ -8,45 +9,84 @@ import Import
 import Handler.Utils
 import Handler.Utils.Exam

+import Database.Persist.Sql (deleteWhereCount)
+

 -- Dedicated ExamRegistrationButton
-data ButtonExamRegister = BtnExamRegister | BtnExamDeregister
-  deriving (Enum, Eq, Ord, Bounded, Read, Show, Generic, Typeable)
+data ButtonExamRegister = BtnExamRegisterOccurrence
+                        | BtnExamSwitchOccurrence
+                        | BtnExamRegister
+                        | BtnExamDeregister
+  deriving (Enum, Bounded, Eq, Ord, Read, Show, Generic, Typeable)
 instance Universe ButtonExamRegister
 instance Finite ButtonExamRegister
-nullaryPathPiece ''ButtonExamRegister $ camelToPathPiece' 1
-embedRenderMessage ''UniWorX ''ButtonExamRegister id
+nullaryPathPiece ''ButtonExamRegister $ camelToPathPiece' 2
+  
 instance Button UniWorX ButtonExamRegister where
-  btnClasses BtnExamRegister   = [BCIsButton, BCPrimary]
-  btnClasses BtnExamDeregister = [BCIsButton, BCDanger]
+  btnClasses BtnExamRegisterOccurrence = [BCIsButton, BCPrimary]
+  btnClasses BtnExamSwitchOccurrence   = [BCIsButton, BCPrimary]
+  btnClasses BtnExamRegister           = [BCIsButton, BCPrimary]
+  btnClasses BtnExamDeregister         = [BCIsButton, BCDanger]

-  btnLabel  BtnExamRegister   = [whamlet|#{iconExamRegister True} _{MsgBtnExamRegister}|]
-  btnLabel  BtnExamDeregister = [whamlet|#{iconExamRegister False} _{MsgBtnExamDeregister}|]
+  btnLabel BtnExamRegisterOccurrence = [whamlet|#{iconExamRegister True } _{MsgBtnExamRegisterOccurrence}|]
+  btnLabel BtnExamSwitchOccurrence   = [whamlet|_{MsgBtnExamSwitchOccurrence}|]
+  btnLabel BtnExamRegister           = [whamlet|#{iconExamRegister True } _{MsgBtnExamRegister}|]
+  btnLabel BtnExamDeregister         = [whamlet|#{iconExamRegister False} _{MsgBtnExamDeregister}|]


 postERegisterR :: TermId -> SchoolId -> CourseShorthand -> ExamName -> Handler Html
-
 postERegisterR tid ssh csh examn = do
  Entity uid User{..} <- requireAuth

  Entity eId Exam{..} <- runDB $ fetchExam tid ssh csh examn

-  ((btnResult, _), _) <- runFormPost buttonForm
+  ((btnResult, _), _) <- runFormPost $ buttonForm' [BtnExamRegister, BtnExamDeregister]

  formResult btnResult $ \case
+    BtnExamDeregister -> do
+      runDB $ do
+        deleted <- deleteWhereCount [ExamRegistrationExam ==. eId, ExamRegistrationUser ==. uid]
+        unless (deleted <= 0) $
+          audit $ TransactionExamDeregister eId uid
+      addMessageIconI Success IconExamRegisterFalse $ MsgExamDeregisteredSuccess examn
+      redirect $ CExamR tid ssh csh examn EShowR
    BtnExamRegister -> do
      runDB $ do
        now <- liftIO getCurrentTime
-        insert_ $ ExamRegistration eId uid Nothing now
+        void $ upsertBy (UniqueExamRegistration eId uid) (ExamRegistration eId uid Nothing now) [ExamRegistrationTime =. now]
        audit $ TransactionExamRegister eId uid
-      addMessageIconI Success IconExamRegisterTrue $ MsgExamRegisteredSuccess examn
+        addMessageIconI Success IconExamRegisterTrue $ MsgExamRegisteredSuccess examn
      redirect $ CExamR tid ssh csh examn EShowR
+    _other -> error "Unexpected due to definition of buttonForm'"
+
+  redirect $ CExamR tid ssh csh examn EShowR
+
+postERegisterOccR :: TermId -> SchoolId -> CourseShorthand -> ExamName -> ExamOccurrenceName -> Handler Html
+postERegisterOccR tid ssh csh examn occn = do
+  Entity uid User{..} <- requireAuth
+  (Entity eId Exam{..}, Entity occId ExamOccurrence{..}) <- runDB $ do
+    eexam@(Entity eId _) <- fetchExam tid ssh csh examn
+    occ <- getBy404 $ UniqueExamOccurrence eId occn
+    return (eexam, occ)
+
+  ((btnResult, _), _) <- runFormPost buttonForm
+  
+  formResult btnResult $ \case
    BtnExamDeregister -> do
      runDB $ do
-        deleteBy $ UniqueExamRegistration eId uid
-        audit $ TransactionExamDeregister eId uid
-      addMessageIconI Info IconExamRegisterFalse $ MsgExamDeregisteredSuccess examn
-        -- yes, it's a success message, but it should be visually different from a positive success, since most will just note the positive green color! See discussion on commit 5f4925a4
+        deleted <- deleteWhereCount [ExamRegistrationExam ==. eId, ExamRegistrationUser ==. uid]
+        unless (deleted <= 0) $
+          audit $ TransactionExamDeregister eId uid
+      addMessageIconI Success IconExamRegisterFalse $ MsgExamDeregisteredSuccess examn
      redirect $ CExamR tid ssh csh examn EShowR
+    btn | btn `elem` [BtnExamRegisterOccurrence, BtnExamSwitchOccurrence] -> do
+      runDB $ do
+        now <- liftIO getCurrentTime
+        void $ upsertBy (UniqueExamRegistration eId uid) (ExamRegistration eId uid (Just occId) now) [ExamRegistrationOccurrence =. Just occId, ExamRegistrationTime =. now]
+        audit $ TransactionExamRegister eId uid
+        addMessageIconI Success IconExamRegisterTrue $ MsgExamRegisteredSuccess examn
+      redirect $ CExamR tid ssh csh examn EShowR
+    _other -> error "Unexpected due to definition of buttonForm'"

-  invalidArgs ["Register/Deregister button required"]
+  redirect $ CExamR tid ssh csh examn EShowR
+  
--- a/src/Handler/Exam/Show.hs
+++ b/src/Handler/Exam/Show.hs
@ -30,7 +30,7 @@ getEShowR tid ssh csh examn = do
    let gradingVisible = NTop (Just cTime) >= NTop examFinished
    gradingShown <- or2M (return gradingVisible) . hasReadAccessTo $ CExamR tid ssh csh examn EEditR

-    let occurrenceAssignmentsVisible = NTop (Just cTime) >= NTop examPublishOccurrenceAssignments
+    let occurrenceAssignmentsVisible = NTop (Just cTime) >= NTop examPublishOccurrenceAssignments || examOccurrenceRule == ExamRoomFifo
    occurrenceAssignmentsShown <- or2M (return occurrenceAssignmentsVisible) . hasReadAccessTo $ CExamR tid ssh csh examn EEditR

    examParts <- sortOn (view $ _entityVal . _examPartNumber) <$> selectList [ ExamPartExam ==. eId ] [ Asc ExamPartName ]
@ -58,10 +58,16 @@ getEShowR tid ssh csh examn = do
      E.orderBy [E.desc registered, E.asc $ examOccurrence E.^. ExamOccurrenceStart, E.asc $ examOccurrence E.^. ExamOccurrenceRoom]
      return (examOccurrence, registered)

-    let occurrences = map (over _2 E.unValue) occurrencesRaw
+    registered <- for mUid $ getBy . UniqueExamRegistration eId
+    mayRegister <- if
+      | examOccurrenceRule == ExamRoomFifo -> anyM occurrencesRaw $ \(Entity _ ExamOccurrence{..}, _) ->
+          hasWriteAccessTo . CExamR tid ssh csh examName $ ERegisterOccR examOccurrenceName
+      | otherwise -> hasWriteAccessTo $ CExamR tid ssh csh examName ERegisterR

-    registered <- for mUid $ existsBy . UniqueExamRegistration eId
-    mayRegister <- (== Authorized) <$> evalAccessDB (CExamR tid ssh csh examName ERegisterR) True
+    let occurrences = sortOn sortPred $ map (over _2 E.unValue) occurrencesRaw
+          where
+            sortPred (Entity _ ExamOccurrence{..}, registered')
+              = (Down $ registered' && not mayRegister, examOccurrenceStart, examOccurrenceRoom)

    lecturerInfoShown <- hasReadAccessTo $ CExamR tid ssh csh examn EEditR

@ -83,12 +89,18 @@ getEShowR tid ssh csh examn = do
        ]

      hasRegistration = any snd occurrences
-      
+
+  mayRegister' <- fmap ((Map.!) . Map.fromList) . for (Nothing : map Just occurrences) $ \case
+    Nothing ->
+      fmap (Nothing, ) . hasWriteAccessTo $ CExamR tid ssh csh examName ERegisterR
+    Just (Entity occId ExamOccurrence{..}, _) ->
+      fmap (Just occId, ) . hasWriteAccessTo . CExamR tid ssh csh examName $ ERegisterOccR examOccurrenceName

  let examTimes = all (\(Entity _ ExamOccurrence{..}, _) -> Just examOccurrenceStart == examStart && examOccurrenceEnd == examEnd) occurrences
-      registerWidget
-        | Just isRegistered <- registered
-        , mayRegister = Just $ do
+      registerWidget mOcc
+        | isRegistered <- is _Just $ join registered
+        , examOccurrenceRule /= ExamRoomFifo || (isRegistered && not (any snd occurrences))
+        , mayRegister' (entityKey <$> mOcc) = Just $ do
            (examRegisterForm, examRegisterEnctype) <- liftHandler . generateFormPost . buttonForm' $ bool [BtnExamRegister] [BtnExamDeregister] isRegistered
            [whamlet|
              <p>
@ -102,11 +114,37 @@ getEShowR tid ssh csh examn = do
              , formEncoding = examRegisterEnctype
              , formSubmit = FormNoSubmit
            }
-        | fromMaybe False registered = Just [whamlet|_{MsgExamRegistered}|]
+        | examOccurrenceRule == ExamRoomFifo
+        , Just (Entity occId ExamOccurrence{..}) <- mOcc
+        , isRegistered <- (== Just occId) $ examRegistrationOccurrence . entityVal =<< join registered
+        , mayRegister' (Just occId) = Just $ do
+            (examRegisterForm, examRegisterEnctype) <- liftHandler . generateFormPost . buttonForm' $ bool [bool BtnExamRegisterOccurrence BtnExamSwitchOccurrence . is _Just $ join registered] [BtnExamDeregister] isRegistered
+            wrapForm examRegisterForm def
+              { formAction = Just . SomeRoute . CExamR tid ssh csh examName $ ERegisterOccR examOccurrenceName
+              , formEncoding = examRegisterEnctype
+              , formSubmit = FormNoSubmit
+            }
+        | is _Nothing mOcc
+        , is _Nothing registered
+        = Just [whamlet|_{MsgExamLoginToRegister}|]
+        | is _Nothing mOcc
+        , isRegistered <- is _Just $ join registered
+        = Just
+            [whamlet|
+              <p>
+                $if isRegistered
+                  _{MsgExamRegistered}
+                $else
+                  _{MsgExamNotRegistered}
+                $if mayRegister
+                  ^{messageTooltip =<< messageI Info MsgExamRegisterForOccurrence}
+            |]
        | otherwise = Nothing

      showMaxPoints = any (has $ _entityVal . _examPartMaxPoints . _Just) examParts
      showAchievedPoints = not $ null results
+      showOccurrenceRegisterColumn = occurrenceAssignmentsShown || (mayRegister && examOccurrenceRule == ExamRoomFifo)
+      markUnregisteredOccurrences mOcc = occurrenceAssignmentsShown && hasRegistration && isn't _Just (registerWidget mOcc)

  let heading = prependCourseTitle tid ssh csh $ CI.original examName

--- a/src/Handler/Material.hs
+++ b/src/Handler/Material.hs
@ -104,6 +104,7 @@ getMaterialListR tid ssh csh = do

  now <- liftIO getCurrentTime
  seeAllModificationTimestamps <- hasWriteAccessTo $ CourseR tid ssh csh MaterialNewR -- ordinary users should not see modification dates older than visibility
+  MsgRenderer mr <- getMsgRenderer
  table <- runDB $ do
    cid <- getKeyBy404 $ TermSchoolCourseShort tid ssh csh
    let row2material = view $ _dbrOutput . _1 . _entityVal
@ -127,9 +128,9 @@ getMaterialListR tid ssh csh = do
                $ foldMap (textCell . CI.original) . materialType . row2material
            , sortable (Just "name") (i18nCell MsgMaterialName)
                $ liftA2 anchorCell matLink toWgt . materialName . row2material
-            , sortable (toNothingS "description") mempty
+            , sortable (toNothingS "description") (mempty & cellAttrs <>~ pure ("uw-hide-columns--hider-label", mr MsgMaterialDescription))
                $ foldMap modalCell . materialDescription . row2material
-            , sortable (toNothingS "zip-archive") mempty
+            , sortable (toNothingS "zip-archive") (mempty & cellAttrs <>~ pure ("uw-hide-columns--hider-label", mr MsgMaterialFiles))
                $ \DBRow{ dbrOutput = (Entity _ Material{..}, E.Value fileNum) } -> if
                  | fileNum == 0 -> mempty
                  | otherwise    -> fileCell $ filesLink materialName
--- a/src/Handler/Tutorial/List.hs
+++ b/src/Handler/Tutorial/List.hs
@ -16,6 +16,7 @@ import qualified Data.CaseInsensitive as CI
 getCTutorialListR :: TermId -> SchoolId -> CourseShorthand -> Handler Html
 getCTutorialListR tid ssh csh = do
  Entity cid Course{..} <- runDB . getBy404 $ TermSchoolCourseShort tid ssh csh
+  MsgRenderer mr <- getMsgRenderer

  let
    tutorialDBTable = DBTable{..}
@ -51,7 +52,7 @@ getCTutorialListR tid ssh csh = do
          , sortable (Just "register-from") (i18nCell MsgTutorialRegisterFrom) $ \DBRow{ dbrOutput = (Entity _ Tutorial{..}, _) } -> maybeDateTimeCell tutorialRegisterFrom
          , sortable (Just "register-to") (i18nCell MsgTutorialRegisterTo) $ \DBRow{ dbrOutput = (Entity _ Tutorial{..}, _) } -> maybeDateTimeCell tutorialRegisterTo
          , sortable (Just "deregister-until") (i18nCell MsgTutorialDeregisterUntil) $ \DBRow{ dbrOutput = (Entity _ Tutorial{..}, _) } -> maybeDateTimeCell tutorialDeregisterUntil
-          , sortable Nothing mempty $ \DBRow{ dbrOutput = (Entity _ Tutorial{..}, _) } -> cell $ do
+          , sortable Nothing (mempty & cellAttrs <>~ pure ("uw-hide-columns--hider-label", mr MsgActionsHead)) $ \DBRow{ dbrOutput = (Entity _ Tutorial{..}, _) } -> cell $ do
              linkButton mempty [whamlet|_{MsgTutorialEdit}|] [BCIsButton] . SomeRoute $ CTutorialR tid ssh csh tutorialName TEditR
              linkButton mempty [whamlet|_{MsgTutorialDelete}|] [BCIsButton, BCDanger] . SomeRoute $ CTutorialR tid ssh csh tutorialName TDeleteR
          ]
--- a/src/Handler/Users.hs
+++ b/src/Handler/Users.hs
@ -71,6 +71,7 @@ instance Button UniWorX AllUsersAction where
 getUsersR, postUsersR :: Handler Html
 getUsersR = postUsersR
 postUsersR = do
+  MsgRenderer mr <- getMsgRenderer
  let
    dbtColonnade = mconcat $
      [ dbRow
@ -100,7 +101,7 @@ postUsersR = do
                $forall (E.Value sh) <- schools
                  <li>#{sh}
              |]
-      , sortable Nothing mempty $ \inp@DBRow{ dbrOutput = Entity uid _ } -> FormCell
+      , sortable Nothing (mempty & cellAttrs <>~ pure ("hide-columns--hider-label", mr MsgActionsHead)) $ \inp@DBRow{ dbrOutput = Entity uid _ } -> FormCell
          { formCellAttrs    = []
          , formCellLens     = id
          , formCellContents = do
--- a/src/Handler/Utils/Form.hs
+++ b/src/Handler/Utils/Form.hs
@ -554,7 +554,9 @@ examBonusRuleForm prev = multiActionA actions (fslI MsgExamBonusRule) $ classify
        )
      ]

-data ExamOccurrenceRule' = ExamRoomSurname'
+data ExamOccurrenceRule' = ExamRoomManual'
+                         | ExamRoomFifo'
+                         | ExamRoomSurname'
                         | ExamRoomMatriculation'
                         | ExamRoomRandom'
  deriving (Eq, Ord, Read, Show, Enum, Bounded, Generic, Typeable)
@ -566,14 +568,18 @@ embedRenderMessage ''UniWorX ''ExamOccurrenceRule' id

 classifyExamOccurrenceRule :: ExamOccurrenceRule -> ExamOccurrenceRule'
 classifyExamOccurrenceRule = \case
+  ExamRoomManual        -> ExamRoomManual'
  ExamRoomSurname       -> ExamRoomSurname'
  ExamRoomMatriculation -> ExamRoomMatriculation'
  ExamRoomRandom        -> ExamRoomRandom'
+  ExamRoomFifo          -> ExamRoomFifo'

 examOccurrenceRuleForm :: Maybe ExamOccurrenceRule -> AForm Handler ExamOccurrenceRule
-examOccurrenceRuleForm = fmap reverseClassify . areq (selectField optionsFinite) (fslI MsgExamOccurrenceRule) . fmap classifyExamOccurrenceRule
+examOccurrenceRuleForm = fmap reverseClassify . areq (selectField optionsFinite) (fslI MsgExamAutomaticOccurrenceAssignment & setTooltip MsgExamAutomaticOccurrenceAssignmentTip) . fmap classifyExamOccurrenceRule
  where
    reverseClassify = \case
+      ExamRoomManual'        -> ExamRoomManual
+      ExamRoomFifo'          -> ExamRoomFifo
      ExamRoomSurname'       -> ExamRoomSurname
      ExamRoomMatriculation' -> ExamRoomMatriculation
      ExamRoomRandom'        -> ExamRoomRandom
--- a/src/Handler/Utils/Table/Cells.hs
+++ b/src/Handler/Utils/Table/Cells.hs
@ -197,7 +197,9 @@ numCell :: (IsDBTable m a, ToMessage b) => b -> DBCell m a
 numCell = textCell . toMessage

 propCell :: (IsDBTable m a, Real b, ToMessage b) => b -> b -> DBCell m a
-propCell curr max' = i18nCell $ MsgProportion (toMessage curr) (toMessage max') (toRational curr / toRational max')
+propCell curr max'
+  | max' /= 0 = i18nCell $ MsgProportion (toMessage curr) (toMessage max') (toRational curr / toRational max')
+  | otherwise = i18nCell $ MsgProportionNoRatio (toMessage curr) (toMessage max')

 int64Cell :: IsDBTable m a => Int64-> DBCell m a
 int64Cell = numCell
--- a/src/Handler/Utils/Table/Pagination.hs
+++ b/src/Handler/Utils/Table/Pagination.hs
@ -1382,7 +1382,7 @@ dbSelect :: forall x h r i a. (Headedness h, Monoid' x)
         -> (DBRow r -> MForm (HandlerFor UniWorX) i)
         -> Colonnade h (DBRow r) (DBCell (MForm (HandlerFor UniWorX)) x)
 -- dbSelect resLens selLens genIndex = Colonnade.singleton (headednessPure $ i18nCell MsgSelectColumn) $ formCell resLens genIndex genForm
-dbSelect resLens selLens genIndex = Colonnade.singleton (headednessPure $ mempty) $ formCell resLens genIndex genForm
+dbSelect resLens selLens genIndex = Colonnade.singleton (headednessPure $ mempty & cellAttrs <>~ pure ("uw-hide-columns--no-hide","")) $ formCell resLens genIndex genForm
  where
    genForm _ mkUnique = do
      (selResult, selWidget) <- mreq checkBoxField (fsUniq mkUnique "select") (Just False)
--- a/src/Import/NoFoundation.hs
+++ b/src/Import/NoFoundation.hs
@ -12,8 +12,9 @@ import Utils.Tokens           as Import
 import Utils.Frontend.Modal   as Import
 import Utils.Lens             as Import

-import Settings               as Import
-import Settings.StaticFiles   as Import
+import Settings                as Import
+import Settings.StaticFiles    as Import
+import Settings.WellKnownFiles as Import

 import CryptoID               as Import
 import Audit                  as Import
--- a/src/Model/Migration.hs
+++ b/src/Model/Migration.hs
@ -599,6 +599,13 @@ customMigrations = Map.fromListWith (>>)
          ALTER TABLE "study_features" DROP COLUMN "sub_field";
        |]
    )
+  , ( AppliedMigrationKey [migrationVersion|29.0.0|] [version|30.0.0|]
+    , whenM (tableExists "exam") $
+        [executeQQ|
+          UPDATE "exam" SET "occurrence_rule" = #{ExamRoomManual} WHERE "occurrence_rule" IS NULL;
+          ALTER TABLE "exam" ALTER COLUMN "occurrence_rule" SET NOT NULL;
+        |]
+    )
  ]


--- a/src/Model/Types/Exam.hs
+++ b/src/Model/Types/Exam.hs
@ -136,7 +136,9 @@ deriveJSON defaultOptions
  } ''ExamBonusRule
 derivePersistFieldJSON ''ExamBonusRule

-data ExamOccurrenceRule = ExamRoomSurname
+data ExamOccurrenceRule = ExamRoomManual
+                        | ExamRoomFifo
+                        | ExamRoomSurname
                        | ExamRoomMatriculation
                        | ExamRoomRandom
  deriving (Show, Read, Eq, Ord, Generic, Typeable)
--- a/src/Model/Types/Security.hs
+++ b/src/Model/Types/Security.hs
@ -54,6 +54,8 @@ data AuthTag -- sortiert nach gewünschter Reihenfolge auf /authpreds, d.h. Prä
  | AuthCourseRegistered
  | AuthTutorialRegistered
  | AuthExamRegistered
+  | AuthExamOccurrenceRegistered
+  | AuthExamOccurrenceRegistration
  | AuthExamResult
  | AuthParticipant
  | AuthApplicant
--- a/src/Settings.hs
+++ b/src/Settings.hs
@ -78,6 +78,8 @@ data AppSettings = AppSettings
    { appStaticDir              :: FilePath
    -- ^ Directory from which to serve static files.
    , appWebpackEntrypoints     :: FilePath
+    , appWellKnownDir           :: FilePath
+    , appWellKnownLinkFile      :: FilePath
    , appDatabaseConf           :: PostgresConf
    -- ^ Configuration settings for accessing the database.
    , appAutoDbMigrate          :: Bool
@ -369,6 +371,8 @@ instance FromJSON AppSettings where
                False
 #endif
        appStaticDir              <- o .: "static-dir"
+        appWellKnownDir           <- o .: "well-known-dir"
+        appWellKnownLinkFile      <- o .: "well-known-link-file"
        appWebpackEntrypoints     <- o .: "webpack-manifest"
        appDatabaseConf           <- o .: "database"
        appAutoDbMigrate          <- o .: "auto-db-migrate"
@ -393,7 +397,7 @@ instance FromJSON AppSettings where

        appMailFrom               <- o .: "mail-from"
        appMailObjectDomain       <- o .: "mail-object-domain"
-        appMailVerp               <- o .: "mail-verp"
+        appMailVerp               <- fromMaybe VerpNone . join <$> (o .:? "mail-verp" <|> pure Nothing)
        appMailSupport            <- o .: "mail-support"

        appJobWorkers             <- o .:  "job-workers"
--- a/src/Settings/StaticFiles.hs
+++ b/src/Settings/StaticFiles.hs
@ -1,9 +1,15 @@
+{-# OPTIONS_GHC -fno-warn-unused-top-binds #-}
+-- Listing only files directly used by consumers of this module
+-- prevents rebuilds if files change, that are not directly used (like
+-- webpack bundles)
 module Settings.StaticFiles
-  ( module Settings.StaticFiles
+  ( img_lmu_sigillum_svg
+  , webpackLinks_main
+  , embeddedStatic
  , module Yesod.EmbeddedStatic
  ) where

-import ClassyPrelude
+import ClassyPrelude.Yesod

 import Settings     (appStaticDir, appWebpackEntrypoints, compileTimeAppSettings)
 import Settings.StaticFiles.Generator
--- a/src/Settings/StaticFiles/Webpack.hs
+++ b/src/Settings/StaticFiles/Webpack.hs
@ -12,7 +12,7 @@ import qualified Data.Yaml as Yaml

 import qualified Data.Map as Map

-import Yesod.Core (Route)
+import Yesod.Core (Route, MonadLogger, MonadWidget, HandlerSite, logDebugS, logErrorS)
 import Yesod.EmbeddedStatic (EmbeddedStatic)
 import Yesod.EmbeddedStatic.Types
 import Network.Mime (MimeType)
@ -27,6 +27,8 @@ import Utils (nubOn)

 import System.FilePath (makeRelative)

+import Text.Shakespeare.Text (st)
+

 mkWebpackEntrypoints :: FilePath -- ^ Path to YAML-manifest
                     -> [FilePath -> Generator]
@ -54,11 +56,30 @@ mkWebpackEntrypoints manifest mkGen stDir = do
        Just n -> tell $ pure (n, ebMimeType entry)
    
    let entryName = mkName $ "webpackEntrypoint_" <> entrypoint
+        widgetName = mkName $ "webpackLinks_" <> entrypoint
+
+    staticR <- newName "staticR" 
    sequence
      [ sigD entryName [t|[(Route EmbeddedStatic, MimeType)]|]
      , funD entryName
          [ clause [] (normalB . listE . map (\(n, mime) -> tupE [varE n, TH.lift mime]) $ nubOn fst entries) []
          ]
+      , sigD widgetName [t|forall m. (MonadLogger m, MonadWidget m) => (Route EmbeddedStatic -> Route (HandlerSite m)) -> m ()|]
+      , funD widgetName
+          [ clause [varP staticR] (normalB [e|
+              do
+                $logDebugS "siteLayout" $ tshow $(varE entryName)
+                forM_ $(varE entryName) $ \(sRoute, mime) ->
+                  let ctEq = (==) `on` simpleContentType
+                   in if
+                        | mime `ctEq` "text/css"
+                          -> addStylesheet $ $(varE staticR) sRoute
+                        | mime `ctEq` "application/javascript"
+                          -> addScript $ $(varE staticR) sRoute
+                        | otherwise
+                          -> $logErrorS "siteLayout" [st|Unknown mime type in webpack bundle: #{tshow mime}|]
+            |]) []
+          ]
      ]
  where
    decodeManifest :: FilePath -> Q (Map String [FilePath])
--- a/src/Settings/WellKnownFiles.hs
+++ b/src/Settings/WellKnownFiles.hs
@ -0,0 +1,11 @@
+module Settings.WellKnownFiles
+  ( WellKnownFileName(..)
+  , getWellKnownR
+  , wellKnownHtmlLinks
+  ) where
+
+import Settings.WellKnownFiles.TH
+  
+import Settings (appWellKnownDir, appWellKnownLinkFile, compileTimeAppSettings)
+
+mkWellKnown "de-de-formal" (appWellKnownDir compileTimeAppSettings) (appWellKnownLinkFile compileTimeAppSettings)
--- a/src/Settings/WellKnownFiles/TH.hs
+++ b/src/Settings/WellKnownFiles/TH.hs
@ -0,0 +1,192 @@
+module Settings.WellKnownFiles.TH
+  ( mkWellKnown
+  ) where
+
+import ClassyPrelude.Yesod
+import Utils
+  
+import Language.Haskell.TH
+import Language.Haskell.TH.Syntax hiding (Lift(..))
+import qualified Language.Haskell.TH.Syntax as TH (Lift(..))
+
+import System.Directory.Tree
+
+import qualified Data.ByteString as BS
+
+import Utils.Lens.TH
+import Control.Lens
+import Data.Set.Lens
+
+import qualified Data.Text as Text
+import qualified Data.Text.Encoding as Text
+import Data.Char as Char (isAlphaNum, toUpper)
+
+import qualified Data.Map as Map
+import qualified Data.Set as Set
+
+import Data.List.NonEmpty (NonEmpty(..))
+
+import Data.HashMap.Strict (HashMap)
+import qualified Data.HashMap.Strict as HashMap
+
+import qualified Data.HashSet as HashSet
+
+import System.FilePath ((</>), splitDirectories, makeRelative)
+
+import Settings.Mime
+
+import Text.Blaze.Html (preEscapedToHtml)
+
+nWellKnownFileName :: Name
+nWellKnownFileName = mkName "WellKnownFileName"
+
+nwellKnownFileNames :: Name
+nwellKnownFileNames = mkName "wellKnownFileNames"
+
+ngetWellKnownR :: Name
+ngetWellKnownR = mkName "getWellKnownR"
+
+nwellKnownHtmlLinks :: Name
+nwellKnownHtmlLinks = mkName "wellKnownHtmlLinks"
+
+
+
+mkWellKnown :: Lang -- ^ Default language
+            -> FilePath -- ^ Base directory
+            -> FilePath -- ^ Link file (@html_code.html@)
+            -> DecsQ
+mkWellKnown defLang wellKnownBase wellKnownLinks = do
+  inputFiles <- fmap dirTree . liftIO $ readDirectoryWith (\f -> (f, ) <$> BS.readFile f) wellKnownBase
+
+  mapM_ qAddDependentFile $ inputFiles ^.. folded . _1
+
+  -- languageFiles :: Map Lang [(FilePath, ByteString)]
+  languageFiles <- if
+    | Dir{contents} <- inputFiles
+      -> return . Map.fromList $ do
+           (language, lContents) <- contents ^.. folded . $(multifocusL 2) _name id
+           Dir{} <- pure lContents
+           let
+             lContents' :: [(FilePath, ByteString)]
+             lContents' = flip mapMaybe (flattenDir lContents) $ \pFile -> do
+               File{..} <- pure pFile
+               guard $ name /= wellKnownLinks
+               return $ file & _1 %~ makeRelative (wellKnownBase </> language)
+           return (Text.pack language, lContents')
+    | otherwise
+      -> fail "wellKnownBase is not a directory"
+
+  fLanguages <- if
+    | defLang `Set.member` Map.keysSet languageFiles
+    , let languages' = Set.delete defLang $ Map.keysSet languageFiles
+      -> return $ defLang :| Set.toList languages'
+    | otherwise
+      -> fail "default language is missing in wellKnownBase"
+
+   -- languageLinks :: Map Lang ByteString
+  languageLinks <- if
+    | Dir{contents} <- inputFiles
+      -> return . Map.fromList $ do
+           (language, lContents) <- contents ^.. folded . $(multifocusL 2) _name id
+           Dir{} <- pure lContents
+           let
+             lContents' :: [ByteString]
+             lContents' = flip mapMaybe (flattenDir lContents) $ \pFile -> do
+               File{..} <- pure pFile
+               guard $ name == wellKnownLinks
+               return $ file ^. _2
+           c <- lContents'
+           return (Text.pack language, c)
+    | otherwise
+      -> fail "wellKnownBase is not a directory"
+
+  lLanguages <- if
+    | defLang `Set.member` Map.keysSet languageLinks
+    , let languages' = Set.delete defLang $ Map.keysSet languageLinks
+      -> return $ defLang :| Set.toList languages'
+    | otherwise
+      -> fail "default language is missing in wellKnownBase"
+  
+
+  fVar <- newName "f"
+  hVar <- newName "h"
+  lVar <- newName "l"
+
+  let fileNames = setOf (folded . folded . _1) languageFiles
+      fileContents = Map.fromListWith (<>) $ do
+        (lang, fs) <- Map.toList languageFiles
+        (fName, fContent) <- fs
+        return ((fContent, mimeLookup $ Text.pack fName), Set.singleton (lang, fName))
+
+      wellKnownFileName = dataD
+        (cxt [])
+        nWellKnownFileName 
+        []
+        Nothing
+        [ normalC (mkName $ fNameManip fName) []
+          | fName <- Set.toList fileNames
+        ]
+        (pure $ derivClause Nothing [[t|Eq|], [t|Ord|], [t|Bounded|], [t|Enum|], [t|Read|], [t|Show|], [t|Generic|], [t|Typeable|]])
+      wellKnownFileNameMapSig = sigD
+        nwellKnownFileNames
+        [t|HashMap [Text] $(conT nWellKnownFileName)|]
+      wellKnownFileNameMap = funD
+        nwellKnownFileNames
+        [ clause [] (normalB $ [e|HashMap.fromList|] `appE` listE [ [e|($(TH.lift . map Text.pack $ splitDirectories fName), $(conE . mkName $ fNameManip fName))|] | fName <- Set.toList fileNames ]) []
+        ]
+      wellKnownFileNamePathMultiPiece = instanceD
+        (cxt [])
+        (conT ''PathMultiPiece `appT` conT nWellKnownFileName)
+        [ funD 'toPathMultiPiece
+          [ clause [conP (mkName $ fNameManip fName) []] (normalB . TH.lift . map Text.pack $ splitDirectories fName) []
+            | fName <- Set.toList fileNames
+          ]
+        , funD 'fromPathMultiPiece $
+          [ clause [] (normalB [e|flip HashMap.lookup $(varE nwellKnownFileNames)|]) []
+          ]
+        ]
+      wellKnownFileNameHashable = instanceD
+        (cxt [])
+        (conT ''Hashable `appT` conT nWellKnownFileName)
+        []
+
+      getWellKnownRSig = sigD
+        ngetWellKnownR
+        [t|forall m. MonadHandler m => $(conT nWellKnownFileName) -> m TypedContent|]
+      getWellKnownR = funD
+        ngetWellKnownR
+        [ clause [varP fVar] (normalB [e|$(varE hVar) =<< selectLanguage fLanguages|])
+          [ funD hVar $ 
+            [ clause [varP lVar] (guardedB
+                [ (,) <$> normalG [e|HashSet.member ($(varE lVar), $(varE fVar)) $ HashSet.fromList $(listE [ tupE [TH.lift l, conE . mkName $ fNameManip fName] | (l, fName) <- Set.toList xs ])|]
+                      <*> [e|TypedContent mime (toContent fContent) <$ setEtag $(TH.lift $ hashToText (mime, fContent))|]
+                ]) []
+              | ((fContent, mime), xs) <- Map.toList fileContents
+            ] ++ pure (clause [wildP] (normalB [e|notFound|]) [])
+          ]
+        ]
+
+      wellKnownHtmlLinksSig = sigD
+        nwellKnownHtmlLinks
+        [t|forall m. MonadWidget m => m ()|]
+      wellKnownHtmlLinks = funD
+        nwellKnownHtmlLinks
+        [ clause [] (normalB [e|toWidgetHead . preEscapedToHtml . $(varE hVar) =<< selectLanguage lLanguages|])
+            [ sigD hVar [t|Text -> Text|]
+            , funD hVar $ 
+              [ clause [varP lVar] (guardedB
+                  [ (,) <$> normalG [|$(varE lVar) == lang|]
+                        <*> TH.lift (Text.filter (`notElem` ['\r', '\n']) $ Text.decodeUtf8 c)
+                  ]) []
+                | (lang, c) <- Map.toList languageLinks
+              ] ++ pure (clause [wildP] (normalB [e|mempty|]) [])
+            ]
+        ]
+
+  sequence
+    [ wellKnownFileName, wellKnownFileNameMapSig, wellKnownFileNameMap, wellKnownFileNamePathMultiPiece, wellKnownFileNameHashable
+    , getWellKnownRSig, getWellKnownR
+    , wellKnownHtmlLinksSig, wellKnownHtmlLinks
+    ]
+  where
+    fNameManip = Text.unpack . mconcat . over (traverse . _head) Char.toUpper . filter (not . null) . Text.split (not . isAlphaNum) . Text.pack
--- a/src/Utils.hs
+++ b/src/Utils.hs
@ -913,11 +913,11 @@ cachedHereBinary = do
  [e| \k -> cachedByBinary (loc, k) |]

 hashToText :: Hashable a => a -> Text
-hashToText = decodeUtf8 . Base64.encode . toStrict . Binary.encode . hash
+hashToText = Text.dropWhileEnd (== '=') . decodeUtf8 . Base64.encode . toStrict . Binary.encode . hash

 setEtagHashable, setWeakEtagHashable :: (MonadHandler m, Hashable a) => a -> m ()
 setEtagHashable = setEtag . hashToText
-setWeakEtagHashable = setEtag . hashToText
+setWeakEtagHashable = setWeakEtag . hashToText

 setLastModified :: MonadHandler m => UTCTime -> m ()
 setLastModified lastModified = do
--- a/static/favicon.ico
+++ b/static/favicon.ico
--- a/static/img/lmu/sigillum.svg
+++ b/static/img/lmu/sigillum.svg
--- a/templates/exam-show.hamlet
+++ b/templates/exam-show.hamlet
@ -76,15 +76,15 @@ $maybe desc <- examDescription
            \ ^{isVisible False}
        <dd .deflist__dd>
          ^{examBonusW bonusRule}
-    $maybe occurrenceRule <- examOccurrenceRule
+    $if examOccurrenceRule /= ExamRoomManual
      $if occurrenceAssignmentsShown
        <dt .deflist__dt>
          _{MsgExamOccurrenceRuleParticipant}
          $if not occurrenceAssignmentsVisible
            \ ^{isVisible False}
        <dd .deflist__dd>
-          _{classifyExamOccurrenceRule occurrenceRule}
-    $maybe registerWdgt <- registerWidget
+          _{classifyExamOccurrenceRule examOccurrenceRule}
+    $maybe registerWdgt <- registerWidget Nothing
      <dt .deflist__dt>_{MsgExamRegistration}
      <dd .deflist__dd>^{registerWdgt}

@ -103,31 +103,39 @@ $if not (null occurrences)
            <th .table__th>
              _{MsgExamRoomName}
              \ ^{isVisible False}
-          $if occurrenceAssignmentsShown
-            <th .table__th>
-              _{MsgExamRoomRegistered}
-              $if not occurrenceAssignmentsVisible
-                \ ^{isVisible False}
          <th .table__th>_{MsgExamRoom}
          $if not examTimes
            <th .table__th>_{MsgExamRoomTime}
+          $if showOccurrenceRegisterColumn
+            <th .table__th>
+              $if examOccurrenceRule == ExamRoomFifo
+                _{MsgExamRoomRegistered}
+              $else
+                _{MsgExamRoomAssigned}
+              $if not occurrenceAssignmentsVisible
+                \ ^{isVisible False}
          <th .table__th>_{MsgExamRoomDescription}
      <tbody>
-        $forall (Entity _occId ExamOccurrence{examOccurrenceName, examOccurrenceRoom, examOccurrenceStart, examOccurrenceEnd, examOccurrenceDescription}, registered) <- occurrences
-          <tr .table__row :occurrenceAssignmentsShown && (not registered && hasRegistration):.occurrence--not-registered>
-            $if occurrenceNamesShown
-              <td .table__td #exam-occurrence__#{examOccurrenceName}>#{examOccurrenceName}
-            $if occurrenceAssignmentsShown
-              <td .table__td>
-                $if registered
-                  #{iconOK}
-            <td .table__td>#{examOccurrenceRoom}
-            $if not examTimes
-              <td .table__td>
-                ^{formatTimeRangeW SelFormatDateTime examOccurrenceStart examOccurrenceEnd}
-            <td .table__td>
-              $maybe desc <- examOccurrenceDescription
-                #{desc}
+        $forall (occurrence, registered) <- occurrences
+          $with Entity _occId ExamOccurrence{examOccurrenceName, examOccurrenceRoom, examOccurrenceStart, examOccurrenceEnd, examOccurrenceDescription} <- occurrence
+            $with registerWdgt <- registerWidget (Just occurrence)
+              <tr .table__row :markUnregisteredOccurrences (Just occurrence) && not registered:.occurrence--not-registered>
+                $if occurrenceNamesShown
+                  <td .table__td #exam-occurrence__#{examOccurrenceName}>#{examOccurrenceName}
+                <td .table__td>#{examOccurrenceRoom}
+                $if not examTimes
+                  <td .table__td>
+                    ^{formatTimeRangeW SelFormatDateTime examOccurrenceStart examOccurrenceEnd}
+                $if showOccurrenceRegisterColumn
+                  <td .table__td>
+                    $maybe registerWdgt' <- registerWdgt
+                      ^{registerWdgt'}
+                    $nothing
+                      $if registered
+                        #{iconOK}
+                <td .table__td>
+                  $maybe desc <- examOccurrenceDescription
+                    #{desc}

 $if gradingShown && not (null examParts)
  <section>
--- a/templates/widgets/tooltip.hamlet
+++ b/templates/widgets/tooltip.hamlet
@ -1,7 +1,7 @@
 $newline never

-<div .tooltip :isInlineTooltip:.tooltip__inline>
-  <div .tooltip__handle .#{urgency}>
+<span .tooltip :isInlineTooltip:.tooltip__inline>
+  <span .tooltip__handle .#{urgency}>
    <i .fas .fa-^{ic}>
-  <div .tooltip__content>
+  <span .tooltip__content>
    ^{tooltip}
--- a/test/Database.hs
+++ b/test/Database.hs
@ -504,7 +504,7 @@ fillDb = do
    , examName = "Klausur"
    , examGradingRule = Nothing
    , examBonusRule = Nothing
-    , examOccurrenceRule = Nothing
+    , examOccurrenceRule = ExamRoomManual
    , examVisibleFrom = Just now
    , examRegisterFrom = Just now
    , examRegisterTo = Just $ addUTCTime (14 * nominalDay) now
--- a/test/FoundationSpec.hs
+++ b/test/FoundationSpec.hs
@ -24,6 +24,11 @@ instance Arbitrary (Route EmbeddedStatic) where
    paramNum <- getNonNegative <$> arbitrary
    params <- replicateM paramNum $ (,) <$> printableText' <*> printableText
    return $ embeddedResourceR path params
+
+  
+instance Arbitrary WellKnownFileName where
+  arbitrary = genericArbitrary
+  shrink = genericShrink
  
 instance Arbitrary SchoolR where
  arbitrary = genericArbitrary
--- a/test/Handler/CommonSpec.hs
+++ b/test/Handler/CommonSpec.hs
@ -6,12 +6,12 @@ spec :: Spec
 spec = withApp $ do
    describe "robots.txt" $ do
        it "gives a 200" $ do
-            get RobotsR
+            get $ WellKnownR RobotsTxt
            statusIs 200
        it "has correct User-agent" $ do
-            get RobotsR
+            get $ WellKnownR RobotsTxt
            bodyContains "User-agent: *"
    describe "favicon.ico" $ do
        it "gives a 200" $ do
-            get FaviconR
+            get $ WellKnownR FaviconIco
            statusIs 200
--- a/test/TestImport.hs
+++ b/test/TestImport.hs
@ -53,6 +53,7 @@ import Control.Monad.Catch as X hiding (Handler(..))
 import Control.Monad.Trans.Resource (runResourceT)

 import Settings
+import Settings.WellKnownFiles as X

 import Data.CaseInsensitive as X (CI)
 import qualified Data.CaseInsensitive as CI
--- a/webpack.config.js
+++ b/webpack.config.js
@ -1,5 +1,11 @@
 const webpack = require('webpack');
 const path = require('path');
+const tmp = require('tmp');
+tmp.setGracefulCleanup();
+const fs = require('fs');
+const glob = require('glob');
+const { execSync } = require('child_process');
+
 const MiniCssExtractPlugin = require('mini-css-extract-plugin');
 const OptimizeCSSAssetsPlugin = require('optimize-css-assets-webpack-plugin');
 const ManifestPlugin = require('webpack-manifest-plugin');
@ -9,6 +15,8 @@ const TerserPlugin = require('terser-webpack-plugin');
 const yaml = require('js-yaml');
 const HashOutput = require('webpack-plugin-hash-output');
 const postcssPresetEnv = require('postcss-preset-env');
+const RemovePlugin = require('remove-files-webpack-plugin');
+const RealFaviconPlugin = require('real-favicon-webpack-plugin');

 const webpackVersion = require('webpack/package.json').version.split('.').slice(0, 2).join('.');
 const packageVersion = require('./package.json').version;
@ -17,57 +25,57 @@ module.exports = {
  module: {
    rules: [
      {
-	loader: 'babel-loader',
+        loader: 'babel-loader',

-	options: {
-	  plugins: ['syntax-dynamic-import'],
+        options: {
+          plugins: ['syntax-dynamic-import'],

-	  presets: [
-	    [
-	      '@babel/preset-env',
-	      {
-		modules: false,
-		targets: {
-		  edge: "17",
-		  firefox: "50",
-		  chrome: "60",
-		  safari: "11.1",
-		  ie: "11",
-		},
-		useBuiltIns: "usage",
-		corejs: 3
-	      }
-	    ]
-	  ]
-	},
-	test: /\.js$/i,
-	exclude: /node_modules/,
+          presets: [
+            [
+              '@babel/preset-env',
+              {
+                modules: false,
+                targets: {
+                  edge: "17",
+                  firefox: "50",
+                  chrome: "60",
+                  safari: "11.1",
+                  ie: "11",
+                },
+                useBuiltIns: "usage",
+                corejs: 3
+              }
+            ]
+          ]
+        },
+        test: /\.js$/i,
+        exclude: /node_modules/,
      },
      {
        test: /\.css$/i,
        use: [ MiniCssExtractPlugin.loader,
               { loader: 'css-loader', options: { sourceMap: true }},
               { loader: 'postcss-loader', options: {
-		   sourceMap: true,
-		   plugins: () => [ postcssPresetEnv ]
-	       }},
+                   sourceMap: true,
+                   plugins: () => [ postcssPresetEnv ]
+               }},
               { loader: 'resolve-url-loader', options: { sourceMap: true }}
             ]
      },
      {
-	test: /\.s(c|a)ss$/i,
+        test: /\.s(c|a)ss$/i,
        use: [ MiniCssExtractPlugin.loader,
               { loader: 'css-loader', options: { sourceMap: true }},
               { loader: 'postcss-loader', options: {
-		   sourceMap: true,
-		   plugins: () => [ postcssPresetEnv ]
-	       }},
+                   sourceMap: true,
+                   plugins: () => [ postcssPresetEnv ]
+               }},
               { loader: 'resolve-url-loader', options: { sourceMap: true }},
               { loader: 'sass-loader', options: { implementation: require('sass'), sourceMap: true }}
             ]
      },
      {
-        test: /\.(woff(2)?|ttf|eot|svg)(\?v=\d+\.\d+\.\d+)?$/i,
+        test: /\.(woff(2)?|ttf|eot|svg)(\?.*)?$/i,
        use: [
          {
            loader: 'file-loader',
@ -103,7 +111,8 @@ module.exports = {
      if (chunk.name) { 
        return chunk.name; 
      } 
-      return chunk.modules.map(m => path.relative(m.context, m.request)).join("_"); 
+      let modules = chunk.modules || [chunk.entryModule];
+      return modules.map(m => path.relative(m.context, m.request)).join("_"); 
    }), 
    new webpack.NamedModulesPlugin(), 
    new ManifestPlugin({
@ -113,7 +122,9 @@ module.exports = {
      serialize: yaml.safeDump
    }),
    new CleanWebpackPlugin({
-      cleanOnceBeforeBuildPatterns: path.resolve(__dirname, 'static', 'wp-*')
+      cleanOnceBeforeBuildPatterns: [ path.resolve(__dirname, 'static'),
+                                      path.resolve(__dirname, 'well-known'),
+                                    ]
    }),
    new webpack.IgnorePlugin(/^\.\/locale$/, /moment$/),
    new CopyPlugin([
@ -121,7 +132,65 @@ module.exports = {
    ]),
    new webpack.DefinePlugin({
      VERSION: JSON.stringify(packageVersion)
-    })
+    }),
+    ...(() => {
+      const faviconJson = require('./config/favicon.json');
+      const langs = new Set();
+      function findLangs(json) {
+        if (json && json._i18n) {
+          Object.keys(json).forEach(key => {
+            if (key !== '_i18n') {
+              langs.add(key);
+            }
+          })
+        } else if (Array.isArray(json)) {
+          json.forEach(elem => findLangs(elem));
+        } else if (typeof json === 'object') {
+          Object.keys(json).forEach(key => findLangs(json[key]));
+        }
+      }
+      findLangs(faviconJson);
+      
+      function selectLang(lang, json) {
+        if (json && json._i18n) {
+          return json[lang];
+        } else if (Array.isArray(json)) {
+          return json.map(elem => selectLang(lang, elem));
+        } else if (typeof json === 'object') {
+          return Object.fromEntries(Object.entries(json).map(([k, v]) => [k, selectLang(lang, v)]));
+        } else {
+          return json;
+        }
+      }
+
+      const langJsons = {};
+      Array.from(langs).forEach(lang => {
+        langJsons[lang] = selectLang(lang, faviconJson);
+      });
+
+      return Array.from(langs).map(lang => {
+        const tmpobj = tmp.fileSync({ dir: ".", postfix: ".json" });
+        fs.writeSync(tmpobj.fd, JSON.stringify(langJsons[lang]));
+        fs.close(tmpobj.fd);
+
+        return [
+          new RealFaviconPlugin({
+            faviconJson: `./${tmpobj.name}`,
+            outputPath: path.resolve(__dirname, 'well-known', lang),
+            inject: false
+          }),
+          new CopyPlugin([
+            { from: 'config/robots.txt', to: path.resolve(__dirname, 'well-known', lang, 'robots.txt') },
+          ])
+        ];
+      }).flat(1);
+    })(),
+    { apply: compiler => compiler.hooks.afterEmit.tap('AfterEmitPlugin', compilation => {
+        const imgFiles = glob.sync(path.resolve(__dirname, 'well-known', '**', '*.@(png)'));
+        const imgFilesArgs = Array.from(imgFiles).join(" ");
+        execSync(`exiftool -overwrite_original -all= ${imgFilesArgs}`, { stdio: 'inherit' });
+      })
+    }
  ],

  output: {
@ -142,7 +211,7 @@ module.exports = {
        sourceMap: true
      }),
      new OptimizeCSSAssetsPlugin({
-	cssProcessorOptions: {
+        cssProcessorOptions: {
          map: {
            inline: false
          }