diff --git a/docs/API.md b/docs/API.md
index 08c91c1..213ca3f 100644
--- a/docs/API.md
+++ b/docs/API.md
@@ -557,31 +557,38 @@ main = do
 ```
 
 <a name="copyObject"></a>
-### copyObject :: Bucket -> Object -> CopyPartSource -> Minio ()
+### copyObject :: DestinationInfo -> SourceInfo -> Minio ()
 Copies content of an object from the service to another
 
 __Parameters__
 
-In the expression `copyObject bucketName objectName cps` the parameters
+In the expression `copyObject dstInfo srcInfo` the parameters
 are:
 
 |Param   |Type   |Description   |
 |:---|:---| :---|
-| `bucketName`  | _Bucket_ (alias for `Text`)  | Name of the bucket |
-| `objectName` | _Object_ (alias for `Text`)  | Name of the object |
-| `cps` | _CopyPartSource_ | A value representing properties of the source object |
+| `dstInfo` | _DestinationInfo_ | A value representing properties of the destination object |
+| `srcInfo` | _SourceInfo_ | A value representing properties of the source object |
 
 
-__CopyPartSource record type__
+__SourceInfo record type__
 
 |Field   |Type   |Description   |
 |:---|:---| :---|
-| `cpSource` | `Text`| Name of source object formatted as "/srcBucket/srcObject" |
-| `cpSourceRange` | `Maybe (Int64, Int64)` | Represents the byte range of source object. (0, 9) represents first ten bytes of source object|
-| `cpSourceIfMatch` | `Maybe Text` | (Optional) ETag source object should match |
-| `cpSourceIfNoneMatch` | `Maybe Text` | (Optional) ETag source object shouldn't match |
-| `cpSourceIfUnmodifiedSince` | `Maybe UTCTime` | (Optional) Time since source object wasn't modified |
-| `cpSourceIfModifiedSince` | `Maybe UTCTime` | (Optional) Time since source object was modified |
+| `srcBucket` | `Bucket` | Name of source bucket |
+| `srcObject` | `Object` | Name of source object |
+| `srcRange` | `Maybe (Int64, Int64)` | (Optional) Represents the byte range of source object. (0, 9) represents first ten bytes of source object|
+| `srcIfMatch` | `Maybe Text` | (Optional) ETag source object should match |
+| `srcIfNoneMatch` | `Maybe Text` | (Optional) ETag source object shouldn't match |
+| `srcIfUnmodifiedSince` | `Maybe UTCTime` | (Optional) Time since source object wasn't modified |
+| `srcIfModifiedSince` | `Maybe UTCTime` | (Optional) Time since source object was modified |
+
+__Destination record type__
+
+|Field   |Type   |Description   |
+|:---|:---| :---|
+| `dstBucket` | `Bucket` | Name of destination bucket in server-side copyObject |
+| `dstObject` | `Object` | Name of destination object in server-side copyObject |
 
 __Example__
 
@@ -594,13 +601,13 @@ main = do
   let
     bucket = "mybucket"
     object = "myobject"
-    srcObject = "/mybucket/srcObject"
+    objectCopy = "obj-copy"
 
   res <- runMinio minioPlayCI $ do
-           copyObject bucket object def { cpSource = srcObject }
+           copyObject def { dstBucket = bucket, dstObject = objectCopy } def { srcBucket = bucket, srcObject = object }
 
   case res of
-    Left e -> putStrLn $ "Failed to copyObject " ++ show srcObject"
+    Left e -> putStrLn $ "Failed to copyObject " ++ show bucket ++ show "/" ++ show object
     Right _ -> putStrLn "copyObject was successful"
 ```
 
diff --git a/examples/CopyObject.hs b/examples/CopyObject.hs
index 15698d5..6665658 100755
--- a/examples/CopyObject.hs
+++ b/examples/CopyObject.hs
@@ -21,7 +21,6 @@
 import           Network.Minio
 
 import           Control.Monad.Catch (catchIf)
-import qualified Data.Text           as T
 import           Prelude
 
 -- | The following example uses minio's play server at
@@ -50,10 +49,8 @@ main = do
     fPutObject bucket object localFile
 
     -- 3. Copy bucket/object to bucket/objectCopy.
-    copyObject bucket objectCopy def {
-      cpSource = T.concat ["/", bucket, "/", object]
-      }
+    copyObject def {dstBucket = bucket, dstObject = objectCopy} def { srcBucket = bucket , srcObject = object }
 
   case res1 of
-    Left e   -> putStrLn $ "copyObject failed." ++ (show e)
+    Left e   -> putStrLn $ "copyObject failed." ++ show e
     Right () -> putStrLn "copyObject succeeded."
diff --git a/minio-hs.cabal b/minio-hs.cabal
index 897cb35..f0c53d4 100644
--- a/minio-hs.cabal
+++ b/minio-hs.cabal
@@ -34,6 +34,7 @@ library
                      , Network.Minio.Data.ByteString
                      , Network.Minio.Data.Crypto
                      , Network.Minio.Data.Time
+                     , Network.Minio.CopyObject
                      , Network.Minio.Errors
                      , Network.Minio.ListOps
                      , Network.Minio.PresignedOperations
@@ -110,6 +111,7 @@ test-suite minio-hs-live-server-test
   other-modules:       Lib.Prelude
                      , Network.Minio
                      , Network.Minio.API
+                     , Network.Minio.CopyObject
                      , Network.Minio.Data
                      , Network.Minio.Data.ByteString
                      , Network.Minio.Data.Crypto
@@ -232,6 +234,7 @@ test-suite minio-hs-test
                      , Network.Minio.Data.ByteString
                      , Network.Minio.Data.Crypto
                      , Network.Minio.Data.Time
+                     , Network.Minio.CopyObject
                      , Network.Minio.Errors
                      , Network.Minio.ListOps
                      , Network.Minio.PresignedOperations
diff --git a/src/Network/Minio.hs b/src/Network/Minio.hs
index e08fd77..f88bc49 100644
--- a/src/Network/Minio.hs
+++ b/src/Network/Minio.hs
@@ -91,8 +91,18 @@ module Network.Minio
   , getObject
 
   -- ** Server-side copying
-  , CopyPartSource(..)
   , copyObject
+  , SourceInfo
+  , srcBucket
+  , srcObject
+  , srcRange
+  , srcIfMatch
+  , srcIfNoneMatch
+  , srcIfModifiedSince
+  , srcIfUnmodifiedSince
+  , DestinationInfo
+  , dstBucket
+  , dstObject
 
   -- ** Querying
   , statObject
@@ -146,6 +156,7 @@ import qualified Data.Map                 as Map
 
 import           Lib.Prelude
 
+import           Network.Minio.CopyObject
 import           Network.Minio.Data
 import           Network.Minio.Errors
 import           Network.Minio.ListOps
@@ -178,12 +189,13 @@ putObject :: Bucket -> Object -> C.Producer Minio ByteString
 putObject bucket object src sizeMay =
   void $ putObjectInternal bucket object $ ODStream src sizeMay
 
--- | Perform a server-side copy operation to create an object with the
--- given bucket and object name from the source specification in
--- CopyPartSource. This function performs a multipart copy operation
--- if the new object is to be greater than 5GiB in size.
-copyObject :: Bucket -> Object -> CopyPartSource -> Minio ()
-copyObject bucket object cps = void $ copyObjectInternal bucket object cps
+-- | Perform a server-side copy operation to create an object based on
+-- the destination specification in DestinationInfo from the source
+-- specification in SourceInfo. This function performs a multipart
+-- copy operation if the new object is to be greater than 5GiB in
+-- size.
+copyObject :: DestinationInfo -> SourceInfo -> Minio ()
+copyObject dstInfo srcInfo = void $ copyObjectInternal (dstBucket dstInfo) (dstObject dstInfo) srcInfo
 
 -- | Remove an object from the object store.
 removeObject :: Bucket -> Object -> Minio ()
diff --git a/src/Network/Minio/CopyObject.hs b/src/Network/Minio/CopyObject.hs
new file mode 100644
index 0000000..e4a419e
--- /dev/null
+++ b/src/Network/Minio/CopyObject.hs
@@ -0,0 +1,92 @@
+--
+-- Minio Haskell SDK, (C) 2017 Minio, Inc.
+--
+-- Licensed under the Apache License, Version 2.0 (the "License");
+-- you may not use this file except in compliance with the License.
+-- You may obtain a copy of the License at
+--
+--     http://www.apache.org/licenses/LICENSE-2.0
+--
+-- Unless required by applicable law or agreed to in writing, software
+-- distributed under the License is distributed on an "AS IS" BASIS,
+-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+-- See the License for the specific language governing permissions and
+-- limitations under the License.
+--
+
+module Network.Minio.CopyObject where
+
+import           Data.Default         (def)
+import qualified Data.List            as List
+
+import           Lib.Prelude
+
+import           Network.Minio.Data
+import           Network.Minio.Errors
+import           Network.Minio.S3API
+import           Network.Minio.Utils
+
+
+-- | Copy an object using single or multipart copy strategy.
+copyObjectInternal :: Bucket -> Object -> SourceInfo
+                   -> Minio ETag
+copyObjectInternal b' o srcInfo = do
+  let sBucket = srcBucket srcInfo
+      sObject = srcObject srcInfo
+
+  -- get source object size with a head request
+  (ObjectInfo _ _ _ srcSize) <- headObject sBucket sObject
+
+  -- check that byte offsets are valid if specified in cps
+  let rangeMay = srcRange srcInfo
+      range = maybe (0, srcSize) identity rangeMay
+      startOffset = fst range
+      endOffset = snd range
+
+  when (isJust rangeMay &&
+        or [startOffset < 0, endOffset < startOffset,
+            endOffset >= fromIntegral srcSize]) $
+    throwM $ MErrVInvalidSrcObjByteRange range
+
+  -- 1. If sz > 64MiB (minPartSize) use multipart copy, OR
+  -- 2. If startOffset /= 0 use multipart copy
+  let destSize = (\(a, b) -> b - a + 1 ) $
+                 maybe (0, srcSize - 1) identity rangeMay
+
+  if destSize > minPartSize || (endOffset - startOffset + 1 /= srcSize)
+    then multiPartCopyObject b' o srcInfo srcSize
+
+    else fst <$> copyObjectSingle b' o srcInfo{srcRange = Nothing} []
+
+-- | Given the input byte range of the source object, compute the
+-- splits for a multipart copy object procedure. Minimum part size
+-- used is minPartSize.
+selectCopyRanges :: (Int64, Int64) -> [(PartNumber, (Int64, Int64))]
+selectCopyRanges (st, end) = zip pns $
+  map (\(x, y) -> (st + x, st + x + y - 1)) $ zip startOffsets partSizes
+  where
+    size = end - st + 1
+    (pns, startOffsets, partSizes) = List.unzip3 $ selectPartSizes size
+
+-- | Perform a multipart copy object action. Since we cannot verify
+-- existing parts based on the source object, there is no resuming
+-- copy action support.
+multiPartCopyObject :: Bucket -> Object -> SourceInfo -> Int64
+                    -> Minio ETag
+multiPartCopyObject b o cps srcSize = do
+  uid <- newMultipartUpload b o []
+
+  let byteRange = maybe (0, fromIntegral $ srcSize - 1) identity $ srcRange cps
+      partRanges = selectCopyRanges byteRange
+      partSources = map (\(x, (start, end)) -> (x, cps {srcRange = Just (start, end) }))
+                    partRanges
+      dstInfo = def { dstBucket = b, dstObject = o}
+
+  copiedParts <- limitedMapConcurrently 10
+                 (\(pn, cps') -> do
+                     (etag, _) <- copyObjectPart dstInfo cps' uid pn []
+                     return (pn, etag)
+                 )
+                 partSources
+
+  completeMultipartUpload b o uid copiedParts
diff --git a/src/Network/Minio/Data.hs b/src/Network/Minio/Data.hs
index ddb6b0c..2766e06 100644
--- a/src/Network/Minio/Data.hs
+++ b/src/Network/Minio/Data.hs
@@ -14,31 +14,47 @@
 -- limitations under the License.
 --
 
-{-# LANGUAGE GeneralizedNewtypeDeriving, TypeFamilies #-}
+{-# LANGUAGE GeneralizedNewtypeDeriving #-}
+{-# LANGUAGE TypeFamilies               #-}
 module Network.Minio.Data where
 
 import           Control.Monad.Base
-import qualified Control.Monad.Catch as MC
+import qualified Control.Monad.Catch          as MC
 import           Control.Monad.Trans.Control
 import           Control.Monad.Trans.Resource
 
-import qualified Data.ByteString as B
-import           Data.Default (Default(..))
-import qualified Data.Map as Map
-import qualified Data.Text as T
-import           Data.Time (formatTime, defaultTimeLocale)
-import           Network.HTTP.Client (defaultManagerSettings)
-import qualified Network.HTTP.Conduit as NC
-import           Network.HTTP.Types (Method, Header, Query)
-import qualified Network.HTTP.Types as HT
+import qualified Data.ByteString              as B
+import           Data.Default                 (Default (..))
+import qualified Data.Map                     as Map
+import qualified Data.Text                    as T
+import           Data.Time                    (defaultTimeLocale, formatTime)
+import           Network.HTTP.Client          (defaultManagerSettings)
+import qualified Network.HTTP.Conduit         as NC
+import           Network.HTTP.Types           (Header, Method, Query)
+import qualified Network.HTTP.Types           as HT
 import           Network.Minio.Errors
 import           Text.XML
 
-import           GHC.Show (Show(..))
+import           GHC.Show                     (Show (..))
 
 import           Lib.Prelude
 
 
+-- | max obj size is 5TiB
+maxObjectSize :: Int64
+maxObjectSize = 5 * 1024 * 1024 * oneMiB
+
+-- | minimum size of parts used in multipart operations.
+minPartSize :: Int64
+minPartSize = 64 * oneMiB
+
+oneMiB :: Int64
+oneMiB = 1024 * 1024
+
+-- | maximum number of parts that can be uploaded for a single object.
+maxMultipartParts :: Int64
+maxMultipartParts = 10000
+
 -- TODO: Add a type which provides typed constants for region.  this
 -- type should have a IsString instance to infer the appropriate
 -- constant.
@@ -65,12 +81,12 @@ awsRegionMap = Map.fromList [
 -- of the provided smart constructors or override fields of the
 -- Default instance.
 data ConnectInfo = ConnectInfo {
-    connectHost :: Text
-  , connectPort :: Int
-  , connectAccessKey :: Text
-  , connectSecretKey :: Text
-  , connectIsSecure :: Bool
-  , connectRegion :: Region
+    connectHost               :: Text
+  , connectPort               :: Int
+  , connectAccessKey          :: Text
+  , connectSecretKey          :: Text
+  , connectIsSecure           :: Bool
+  , connectRegion             :: Region
   , connectAutoDiscoverRegion :: Bool
   } deriving (Eq, Show)
 
@@ -169,7 +185,7 @@ type ETag = Text
 -- |
 -- BucketInfo returned for list buckets call
 data BucketInfo = BucketInfo {
-    biName :: Bucket
+    biName         :: Bucket
   , biCreationDate :: UTCTime
   } deriving (Show, Eq)
 
@@ -185,102 +201,85 @@ type PartTuple = (PartNumber, ETag)
 -- | Represents result from a listing of object parts of an ongoing
 -- multipart upload.
 data ListPartsResult = ListPartsResult {
-    lprHasMore :: Bool
+    lprHasMore  :: Bool
   , lprNextPart :: Maybe Int
-  , lprParts :: [ObjectPartInfo]
+  , lprParts    :: [ObjectPartInfo]
  } deriving (Show, Eq)
 
 
 -- | Represents information about an object part in an ongoing
 -- multipart upload.
 data ObjectPartInfo = ObjectPartInfo {
-    opiNumber :: PartNumber
-  , opiETag :: ETag
-  , opiSize :: Int64
+    opiNumber  :: PartNumber
+  , opiETag    :: ETag
+  , opiSize    :: Int64
   , opiModTime :: UTCTime
   } deriving (Show, Eq)
 
 -- | Represents result from a listing of incomplete uploads to a
 -- bucket.
 data ListUploadsResult = ListUploadsResult {
-    lurHasMore :: Bool
-  , lurNextKey :: Maybe Text
+    lurHasMore    :: Bool
+  , lurNextKey    :: Maybe Text
   , lurNextUpload :: Maybe Text
-  , lurUploads :: [(Object, UploadId, UTCTime)]
-  , lurCPrefixes :: [Text]
+  , lurUploads    :: [(Object, UploadId, UTCTime)]
+  , lurCPrefixes  :: [Text]
   } deriving (Show, Eq)
 
 -- | Represents information about a multipart upload.
 data UploadInfo = UploadInfo {
-    uiKey :: Object
+    uiKey      :: Object
   , uiUploadId :: UploadId
   , uiInitTime :: UTCTime
-  , uiSize :: Int64
+  , uiSize     :: Int64
   } deriving (Show, Eq)
 
 -- | Represents result from a listing of objects in a bucket.
 data ListObjectsResult = ListObjectsResult {
-    lorHasMore :: Bool
+    lorHasMore   :: Bool
   , lorNextToken :: Maybe Text
-  , lorObjects :: [ObjectInfo]
+  , lorObjects   :: [ObjectInfo]
   , lorCPrefixes :: [Text]
   } deriving (Show, Eq)
 
 -- | Represents result from a listing of objects version 1 in a bucket.
 data ListObjectsV1Result = ListObjectsV1Result {
-    lorHasMore' :: Bool
+    lorHasMore'   :: Bool
   , lorNextMarker :: Maybe Text
-  , lorObjects' :: [ObjectInfo]
+  , lorObjects'   :: [ObjectInfo]
   , lorCPrefixes' :: [Text]
   } deriving (Show, Eq)
 
 -- | Represents information about an object.
 data ObjectInfo = ObjectInfo {
-    oiObject :: Object
+    oiObject  :: Object
   , oiModTime :: UTCTime
-  , oiETag :: ETag
-  , oiSize :: Int64
+  , oiETag    :: ETag
+  , oiSize    :: Int64
   } deriving (Show, Eq)
 
-data CopyPartSource = CopyPartSource {
-    -- | formatted like "\/sourceBucket\/sourceObject"
-    cpSource :: Text
-    -- | (0, 9) means first ten bytes of the source object
-  , cpSourceRange :: Maybe (Int64, Int64)
-  , cpSourceIfMatch :: Maybe Text
-  , cpSourceIfNoneMatch :: Maybe Text
-  , cpSourceIfUnmodifiedSince :: Maybe UTCTime
-  , cpSourceIfModifiedSince :: Maybe UTCTime
+-- | Represents source object in server-side copy object
+data SourceInfo = SourceInfo {
+    srcBucket            :: Text
+  , srcObject            :: Text
+  , srcRange             :: Maybe (Int64, Int64)
+  , srcIfMatch           :: Maybe Text
+  , srcIfNoneMatch       :: Maybe Text
+  , srcIfModifiedSince   :: Maybe UTCTime
+  , srcIfUnmodifiedSince :: Maybe UTCTime
   } deriving (Show, Eq)
 
-instance Default CopyPartSource where
-  def = CopyPartSource "" def def def def def
+instance Default SourceInfo where
+  def = SourceInfo "" "" def def def def def
 
-cpsToHeaders :: CopyPartSource -> [HT.Header]
-cpsToHeaders cps = ("x-amz-copy-source", encodeUtf8 $ cpSource cps) :
-                   rangeHdr ++ zip names values
-  where
-    names = ["x-amz-copy-source-if-match", "x-amz-copy-source-if-none-match",
-             "x-amz-copy-source-if-unmodified-since",
-             "x-amz-copy-source-if-modified-since"]
-    values = mapMaybe (fmap encodeUtf8 . (cps &))
-             [cpSourceIfMatch, cpSourceIfNoneMatch,
-              fmap formatRFC1123 . cpSourceIfUnmodifiedSince,
-              fmap formatRFC1123 . cpSourceIfModifiedSince]
-    rangeHdr = ("x-amz-copy-source-range",)
-             . HT.renderByteRanges
-             . (:[])
-             . uncurry HT.ByteRangeFromTo
-           <$> map (both fromIntegral) (maybeToList $ cpSourceRange cps)
+-- | Represents destination object in server-side copy object
+data DestinationInfo = DestinationInfo {
+  dstBucket   :: Text
+  , dstObject :: Text
+  } deriving (Show, Eq)
 
--- | Extract the source bucket and source object name. TODO: validate
--- the bucket and object name extracted.
-cpsToObject :: CopyPartSource -> Maybe (Bucket, Object)
-cpsToObject cps = do
-  [_, bucket, object] <- Just splits
-  return (bucket, object)
-  where
-    splits = T.splitOn "/" $ cpSource cps
+instance Default DestinationInfo where
+  def = DestinationInfo "" ""
 
 -- | A data-type for events that can occur in the object storage
 -- server. Reference:
@@ -352,7 +351,7 @@ instance Default FilterRules where
 -- for objects having a suffix of ".jpg", and the `prefixRule`
 -- restricts it to objects having a prefix of "images/".
 data FilterRule = FilterRule
-  { frName :: Text
+  { frName  :: Text
   , frValue :: Text
   } deriving (Show, Eq)
 
@@ -362,8 +361,8 @@ type Arn = Text
 -- notification system. It could represent a Queue, Topic or Lambda
 -- Function configuration.
 data NotificationConfig = NotificationConfig
-  { ncId :: Text
-  , ncArn :: Arn
+  { ncId     :: Text
+  , ncArn    :: Arn
   , ncEvents :: [Event]
   , ncFilter :: Filter
   } deriving (Show, Eq)
@@ -374,8 +373,8 @@ data NotificationConfig = NotificationConfig
 -- described at
 -- <https://docs.aws.amazon.com/AmazonS3/latest/API/RESTBucketPUTnotification.html>
 data Notification = Notification
-  { nQueueConfigurations :: [NotificationConfig]
-  , nTopicConfigurations :: [NotificationConfig]
+  { nQueueConfigurations         :: [NotificationConfig]
+  , nTopicConfigurations         :: [NotificationConfig]
   , nCloudFunctionConfigurations :: [NotificationConfig]
   } deriving (Eq, Show)
 
@@ -393,14 +392,14 @@ instance Default Payload where
   def = PayloadBS ""
 
 data RequestInfo = RequestInfo {
-    riMethod :: Method
-  , riBucket :: Maybe Bucket
-  , riObject :: Maybe Object
-  , riQueryParams :: Query
-  , riHeaders :: [Header]
-  , riPayload :: Payload
-  , riPayloadHash :: Maybe ByteString
-  , riRegion :: Maybe Region
+    riMethod        :: Method
+  , riBucket        :: Maybe Bucket
+  , riObject        :: Maybe Object
+  , riQueryParams   :: Query
+  , riHeaders       :: [Header]
+  , riPayload       :: Payload
+  , riPayloadHash   :: Maybe ByteString
+  , riRegion        :: Maybe Region
   , riNeedsLocation :: Bool
   }
 
@@ -445,7 +444,7 @@ instance MonadBaseControl IO Minio where
 
 -- | MinioConn holds connection info and a connection pool
 data MinioConn = MinioConn {
-    mcConnInfo :: ConnectInfo
+    mcConnInfo    :: ConnectInfo
   , mcConnManager :: NC.Manager
   }
 
diff --git a/src/Network/Minio/PutObject.hs b/src/Network/Minio/PutObject.hs
index d5c00b5..1279ded 100644
--- a/src/Network/Minio/PutObject.hs
+++ b/src/Network/Minio/PutObject.hs
@@ -19,9 +19,6 @@ module Network.Minio.PutObject
     putObjectInternal
   , ObjectData(..)
   , selectPartSizes
-  , copyObjectInternal
-  , selectCopyRanges
-  , minPartSize
   ) where
 
 
@@ -39,20 +36,6 @@ import           Network.Minio.S3API
 import           Network.Minio.Utils
 
 
--- | max obj size is 5TiB
-maxObjectSize :: Int64
-maxObjectSize = 5 * 1024 * 1024 * oneMiB
-
--- | minimum size of parts used in multipart operations.
-minPartSize :: Int64
-minPartSize = 64 * oneMiB
-
-oneMiB :: Int64
-oneMiB = 1024 * 1024
-
-maxMultipartParts :: Int64
-maxMultipartParts = 10000
-
 -- | A data-type to represent the source data for an object. A
 -- file-path or a producer-conduit may be provided.
 --
@@ -95,23 +78,6 @@ putObjectInternal b o (ODFile fp sizeMay) = do
          | otherwise -> sequentialMultipartUpload b o (Just size) $
                         CB.sourceFile fp
 
--- | Select part sizes - the logic is that the minimum part-size will
--- be 64MiB.
-selectPartSizes :: Int64 -> [(PartNumber, Int64, Int64)]
-selectPartSizes size = uncurry (List.zip3 [1..]) $
-                       List.unzip $ loop 0 size
-  where
-    ceil :: Double -> Int64
-    ceil = ceiling
-    partSize = max minPartSize (ceil $ fromIntegral size /
-                               fromIntegral maxMultipartParts)
-
-    m = fromIntegral partSize
-    loop st sz
-      | st > sz = []
-      | st + m >= sz = [(st, sz - st)]
-      | otherwise = (st, m) : loop (st + m) sz
-
 parallelMultipartUpload :: Bucket -> Object -> FilePath -> Int64
                         -> Minio ETag
 parallelMultipartUpload b o filePath size = do
@@ -163,69 +129,3 @@ sequentialMultipartUpload b o sizeMay src = do
         Just payload -> do pinfo <- lift $ putObjectPart b o uid pn [] payload
                            C.yield pinfo
                            uploadPart' uid pns
-
--- | Copy an object using single or multipart copy strategy.
-copyObjectInternal :: Bucket -> Object -> CopyPartSource
-                   -> Minio ETag
-copyObjectInternal b' o cps = do
-  -- validate and extract the src bucket and object
-  (srcBucket, srcObject) <- maybe
-    (throwM $ MErrVInvalidSrcObjSpec $ cpSource cps)
-    return $ cpsToObject cps
-
-  -- get source object size with a head request
-  (ObjectInfo _ _ _ srcSize) <- headObject srcBucket srcObject
-
-  -- check that byte offsets are valid if specified in cps
-  when (isJust (cpSourceRange cps) &&
-        or [fst range < 0, snd range < fst range,
-            snd range >= fromIntegral srcSize]) $
-    throwM $ MErrVInvalidSrcObjByteRange range
-
-  -- 1. If sz > 64MiB (minPartSize) use multipart copy, OR
-  -- 2. If startOffset /= 0 use multipart copy
-  let destSize = (\(a, b) -> b - a + 1 ) $
-                 maybe (0, srcSize - 1) identity $ cpSourceRange cps
-      startOffset = maybe 0 fst $ cpSourceRange cps
-      endOffset = maybe (srcSize - 1) snd $ cpSourceRange cps
-
-  if destSize > minPartSize || (endOffset - startOffset + 1 /= srcSize)
-    then multiPartCopyObject b' o cps srcSize
-
-    else fst <$> copyObjectSingle b' o cps{cpSourceRange = Nothing} []
-
-  where
-    range = maybe (0, 0) identity $ cpSourceRange cps
-
--- | Given the input byte range of the source object, compute the
--- splits for a multipart copy object procedure. Minimum part size
--- used is minPartSize.
-selectCopyRanges :: (Int64, Int64) -> [(PartNumber, (Int64, Int64))]
-selectCopyRanges (st, end) = zip pns $
-  map (\(x, y) -> (st + x, st + x + y - 1)) $ zip startOffsets partSizes
-  where
-    size = end - st + 1
-    (pns, startOffsets, partSizes) = List.unzip3 $ selectPartSizes size
-
--- | Perform a multipart copy object action. Since we cannot verify
--- existing parts based on the source object, there is no resuming
--- copy action support.
-multiPartCopyObject :: Bucket -> Object -> CopyPartSource -> Int64
-                    -> Minio ETag
-multiPartCopyObject b o cps srcSize = do
-  uid <- newMultipartUpload b o []
-
-  let byteRange = maybe (0, fromIntegral $ srcSize - 1) identity $
-                  cpSourceRange cps
-      partRanges = selectCopyRanges byteRange
-      partSources = map (\(x, y) -> (x, cps {cpSourceRange = Just y}))
-                    partRanges
-
-  copiedParts <- limitedMapConcurrently 10
-                 (\(pn, cps') -> do
-                     (etag, _) <- copyObjectPart b o cps' uid pn []
-                     return (pn, etag)
-                 )
-                 partSources
-
-  completeMultipartUpload b o uid copiedParts
diff --git a/src/Network/Minio/S3API.hs b/src/Network/Minio/S3API.hs
index 3f11caa..b01ea02 100644
--- a/src/Network/Minio/S3API.hs
+++ b/src/Network/Minio/S3API.hs
@@ -51,7 +51,6 @@ module Network.Minio.S3API
   , PartTuple
   , Payload(..)
   , PartNumber
-  , CopyPartSource(..)
   , newMultipartUpload
   , putObjectPart
   , copyObjectPart
@@ -252,17 +251,33 @@ putObjectPart bucket object uploadId partNumber headers payload = do
       , ("partNumber", Just $ show partNumber)
       ]
 
+srcInfoToHeaders :: SourceInfo -> [HT.Header]
+srcInfoToHeaders srcInfo = ("x-amz-copy-source", encodeUtf8 $ format "/{}/{}" [srcBucket srcInfo, srcObject srcInfo]) :
+                   rangeHdr ++ zip names values
+  where
+    names = ["x-amz-copy-source-if-match", "x-amz-copy-source-if-none-match",
+             "x-amz-copy-source-if-unmodified-since",
+             "x-amz-copy-source-if-modified-since"]
+    values = mapMaybe (fmap encodeUtf8 . (srcInfo &))
+             [srcIfMatch, srcIfNoneMatch,
+              fmap formatRFC1123 . srcIfUnmodifiedSince,
+              fmap formatRFC1123 . srcIfModifiedSince]
+    rangeHdr = maybe [] (\a -> [("x-amz-copy-source-range", HT.renderByteRanges [a])])
+               $ toByteRange <$> srcRange srcInfo
+    toByteRange :: (Int64, Int64) -> HT.ByteRange
+    toByteRange (x, y) = HT.ByteRangeFromTo (fromIntegral x) (fromIntegral y)
+
 -- | Performs server-side copy of an object or part of an object as an
 -- upload part of an ongoing multi-part upload.
-copyObjectPart :: Bucket -> Object -> CopyPartSource -> UploadId
+copyObjectPart :: DestinationInfo -> SourceInfo -> UploadId
                -> PartNumber -> [HT.Header] -> Minio (ETag, UTCTime)
-copyObjectPart bucket object cps uploadId partNumber headers = do
+copyObjectPart dstInfo srcInfo uploadId partNumber headers = do
   resp <- executeRequest $
           def { riMethod = HT.methodPut
-              , riBucket = Just bucket
-              , riObject = Just object
+              , riBucket = Just $ dstBucket dstInfo
+              , riObject = Just $ dstObject dstInfo
               , riQueryParams = mkOptionalParams params
-              , riHeaders = headers ++ cpsToHeaders cps
+              , riHeaders = headers ++ srcInfoToHeaders srcInfo
               }
 
   parseCopyObjectResponse $ NC.responseBody resp
@@ -275,17 +290,17 @@ copyObjectPart bucket object cps uploadId partNumber headers = do
 -- | Performs server-side copy of an object that is upto 5GiB in
 -- size. If the object is greater than 5GiB, this function throws the
 -- error returned by the server.
-copyObjectSingle :: Bucket -> Object -> CopyPartSource -> [HT.Header]
+copyObjectSingle :: Bucket -> Object -> SourceInfo -> [HT.Header]
                  -> Minio (ETag, UTCTime)
-copyObjectSingle bucket object cps headers = do
-  -- validate that cpSourceRange is Nothing for this API.
-  when (isJust $ cpSourceRange cps) $
+copyObjectSingle bucket object srcInfo headers = do
+  -- validate that srcRange is Nothing for this API.
+  when (isJust $ srcRange srcInfo) $
     throwM MErrVCopyObjSingleNoRangeAccepted
   resp <- executeRequest $
           def { riMethod = HT.methodPut
               , riBucket = Just bucket
               , riObject = Just object
-              , riHeaders = headers ++ cpsToHeaders cps
+              , riHeaders = headers ++ srcInfoToHeaders srcInfo
               }
   parseCopyObjectResponse $ NC.responseBody resp
 
diff --git a/src/Network/Minio/Utils.hs b/src/Network/Minio/Utils.hs
index a8e9673..dff95f3 100644
--- a/src/Network/Minio/Utils.hs
+++ b/src/Network/Minio/Utils.hs
@@ -24,8 +24,10 @@ import qualified Control.Monad.Trans.Resource as R
 
 import qualified Data.ByteString as B
 import qualified Data.ByteString.Lazy as LB
+import           Data.CaseInsensitive (mk)
 import qualified Data.Conduit as C
 import qualified Data.Conduit.Binary as CB
+import qualified Data.List as List
 import qualified Data.Text as T
 import           Data.Text.Encoding.Error (lenientDecode)
 import           Data.Text.Read (decimal)
@@ -35,11 +37,11 @@ import qualified Network.HTTP.Conduit as NC
 import qualified Network.HTTP.Types as HT
 import qualified Network.HTTP.Types.Header as Hdr
 import qualified System.IO as IO
-import           Data.CaseInsensitive (mk)
 
 
 import           Lib.Prelude
 
+import           Network.Minio.Data
 import           Network.Minio.XmlParser (parseErrResponse)
 
 allocateReadFile :: (R.MonadResource m, R.MonadResourceBase m, MonadCatch m)
@@ -203,3 +205,20 @@ chunkBSConduit s = loop 0 [] s
                            loop (fromIntegral $ B.length b) [b] sizes
                    else loop (n + fromIntegral (B.length bs))
                         (readChunks ++ [bs]) (size:sizes)
+
+-- | Select part sizes - the logic is that the minimum part-size will
+-- be 64MiB.
+selectPartSizes :: Int64 -> [(PartNumber, Int64, Int64)]
+selectPartSizes size = uncurry (List.zip3 [1..]) $
+                       List.unzip $ loop 0 size
+  where
+    ceil :: Double -> Int64
+    ceil = ceiling
+    partSize = max minPartSize (ceil $ fromIntegral size /
+                               fromIntegral maxMultipartParts)
+
+    m = fromIntegral partSize
+    loop st sz
+      | st > sz = []
+      | st + m >= sz = [(st, sz - st)]
+      | otherwise = (st, m) : loop (st + m) sz
diff --git a/test/LiveServer.hs b/test/LiveServer.hs
index 25e38a3..6d59990 100644
--- a/test/LiveServer.hs
+++ b/test/LiveServer.hs
@@ -42,7 +42,6 @@ import           System.Environment                    (lookupEnv)
 
 import           Network.Minio
 import           Network.Minio.Data
-import           Network.Minio.ListOps
 import           Network.Minio.PutObject
 import           Network.Minio.S3API
 import           Network.Minio.Utils
@@ -57,8 +56,6 @@ tests = testGroup "Tests" [liveServerUnitTests]
 randomDataSrc :: MonadIO m => Int64 -> C.Producer m ByteString
 randomDataSrc s' = genBS s'
   where
-    oneMiB = 1024*1024
-
     concatIt bs n = BS.concat $ replicate (fromIntegral q) bs ++
                     [BS.take (fromIntegral r) bs]
       where (q, r) = n `divMod` fromIntegral (BS.length bs)
@@ -166,7 +163,10 @@ highLevelListingTest = funTestWithBucket "High-level listObjects Test" $
         (map oiObject objects)
 
       step "High-level listing of objects (version 1)"
-      objects <- listObjectsV1 bucket Nothing True $$ sinkList
+      objectsV1 <- listObjectsV1 bucket Nothing True $$ sinkList
+
+      liftIO $ assertEqual "Objects match failed!" (sort expectedObjects)
+        (map oiObject objectsV1)
 
       step "Cleanup actions"
       forM_ expectedObjects $
@@ -226,14 +226,14 @@ listingTest = funTestWithBucket "Listing Test" $ \step bucket -> do
         (map oiObject $ lorObjects res)
 
       step "Simple list version 1"
-      res <- listObjectsV1' bucket Nothing Nothing Nothing Nothing
+      resV1 <- listObjectsV1' bucket Nothing Nothing Nothing Nothing
       let expected = sort $ map (T.concat .
                           ("lsb-release":) .
                           (\x -> [x]) .
                           T.pack .
                           show) [1..10::Int]
       liftIO $ assertEqual "Objects match failed!" expected
-        (map oiObject $ lorObjects' res)
+        (map oiObject $ lorObjects' resV1)
 
       step "Cleanup actions"
       forM_ objects $ \obj -> deleteObject bucket obj
@@ -338,8 +338,8 @@ liveServerUnitTests = testGroup "Unit tests against a live server"
       fPutObject bucket object inputFile
 
       step "copy object"
-      let cps = def { cpSource = format "/{}/{}" [bucket, object] }
-      (etag, modTime) <- copyObjectSingle bucket objCopy cps []
+      let srcInfo = def { srcBucket = bucket, srcObject = object}
+      (etag, modTime) <- copyObjectSingle bucket objCopy srcInfo []
 
       -- retrieve obj info to check
       ObjectInfo _ t e s <- headObject bucket objCopy
@@ -368,10 +368,11 @@ liveServerUnitTests = testGroup "Unit tests against a live server"
       liftIO $ (T.length uid > 0) @? "Got an empty multipartUpload Id."
 
       step "put object parts 1-3"
-      let cps' = def {cpSource = format "/{}/{}" [bucket, srcObj]}
+      let srcInfo' = def { srcBucket = bucket, srcObject = srcObj }
+          dstInfo' = def { dstBucket = bucket, dstObject = copyObj }
       parts <- forM [1..3] $ \p -> do
-        (etag', _) <- copyObjectPart bucket copyObj cps'{
-          cpSourceRange = Just ((p-1)*mb5, (p-1)*mb5 + (mb5 - 1))
+        (etag', _) <- copyObjectPart dstInfo' srcInfo'{
+          srcRange = Just $ (,) ((p-1)*mb5) ((p-1)*mb5 + (mb5 - 1))
           } uid (fromIntegral p) []
         return (fromIntegral p, etag')
 
@@ -398,7 +399,7 @@ liveServerUnitTests = testGroup "Unit tests against a live server"
 
       step "make small and large object copy"
       forM_ (zip copyObjs srcs) $ \(cp, src) ->
-        copyObject bucket cp def{cpSource = format "/{}/{}" [bucket, src]}
+        copyObject def {dstBucket = bucket, dstObject = cp} def{srcBucket = bucket, srcObject = src}
 
       step "verify uploaded objects"
       uploadedSizes <- fmap oiSize <$> forM copyObjs (headObject bucket)
@@ -415,9 +416,10 @@ liveServerUnitTests = testGroup "Unit tests against a live server"
       fPutObject bucket src =<< mkRandFile size
 
       step "copy last 10MiB of object"
-      copyObject bucket copyObj def{
-          cpSource = format "/{}/{}" [bucket, src]
-        , cpSourceRange = Just (5 * 1024 * 1024, size - 1)
+      copyObject def { dstBucket = bucket, dstObject = copyObj } def{
+          srcBucket = bucket
+        , srcObject = src
+        , srcRange = Just $ (,) (5 * 1024 * 1024) (size - 1)
         }
 
       step "verify uploaded object"
diff --git a/test/Spec.hs b/test/Spec.hs
index 91423e7..60e6e63 100644
--- a/test/Spec.hs
+++ b/test/Spec.hs
@@ -22,6 +22,8 @@ import qualified Data.List as L
 import           Lib.Prelude
 
 import           Network.Minio.API.Test
+import           Network.Minio.CopyObject
+import           Network.Minio.Data
 import           Network.Minio.PutObject
 import           Network.Minio.Utils.Test
 import           Network.Minio.XmlGenerator.Test