77 lines
2.4 KiB
Haskell
77 lines
2.4 KiB
Haskell
{-# LANGUAGE TypeSynonymInstances #-}
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{-# LANGUAGE CPP #-}
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{-# OPTIONS_GHC -fno-warn-orphans #-}
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module Yesod.Json
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( -- * Convert from a JSON value
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defaultLayoutJson
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, jsonToRepJson
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-- * Convert to a JSON value
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, parseJsonBody
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-- * Produce JSON values
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, J.Value (..)
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, toObject
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, toArray
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) where
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import Yesod.Handler (GHandler, waiRequest)
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import Yesod.Content
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( ToContent (toContent), RepHtmlJson (RepHtmlJson), RepHtml (RepHtml)
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, RepJson (RepJson), Content (ContentBuilder)
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)
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import Yesod.Core (defaultLayout, Yesod)
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import Yesod.Widget (GWidget)
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import qualified Data.Aeson as J
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import qualified Data.Aeson.Encode as JE
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import Data.Aeson.Encode (fromValue)
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import Data.Conduit.Attoparsec (sinkParser)
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import Data.Text (Text)
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import Control.Monad.Trans.Class (lift)
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import Data.HashMap.Strict (fromList)
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import qualified Data.Vector as V
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import Text.Julius (ToJavascript (..))
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import Data.Text.Lazy.Builder (fromLazyText)
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import Data.Text.Lazy.Encoding (decodeUtf8)
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import Data.Text.Lazy.Builder (toLazyText)
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import qualified Blaze.ByteString.Builder.Char.Utf8 as Blaze
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import Data.Conduit (($$))
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import Network.Wai (requestBody)
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instance ToContent J.Value where
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toContent = flip ContentBuilder Nothing
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. Blaze.fromLazyText
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. toLazyText
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. fromValue
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-- | Provide both an HTML and JSON representation for a piece of data, using
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-- the default layout for the HTML output ('defaultLayout').
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defaultLayoutJson :: Yesod master
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=> GWidget sub master ()
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-> J.Value
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-> GHandler sub master RepHtmlJson
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defaultLayoutJson w json = do
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RepHtml html' <- defaultLayout w
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return $ RepHtmlJson html' $ toContent json
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-- | Wraps the 'Content' generated by 'jsonToContent' in a 'RepJson'.
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jsonToRepJson :: J.Value -> GHandler sub master RepJson
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jsonToRepJson = return . RepJson . toContent
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-- | Parse the request body as a JSON value.
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--
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-- /Since: 0.2.3/
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parseJsonBody :: GHandler sub master J.Value
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parseJsonBody = do
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req <- waiRequest
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lift $ requestBody req $$ sinkParser J.json'
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instance ToJavascript J.Value where
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toJavascript = fromLazyText . decodeUtf8 . JE.encode
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-- | Convert a list of pairs to an 'J.Object'.
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toObject :: [(Text, J.Value)] -> J.Value
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toObject = J.Object . fromList
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-- | Convert a list of values to an 'J.Array'.
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toArray :: [J.Value] -> J.Value
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toArray = J.Array . V.fromList
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