condensed medium settings code. Albumowner can now delete media not owned by him

Handler/MediumSettings.hs

@@ -1,56 +1,29 @@
 module Handler.MediumSettings where
 
 import Import
+import Handler.Commons
 import System.Directory
 import System.FilePath
 import Data.List (tail)
 
 getMediumSettingsR :: MediumId -> Handler Html
 getMediumSettingsR mediumId = do
-  tempMedium <- runDB $ get mediumId
-  case tempMedium of
-    Just medium -> do
-      ownerId <- return $ mediumOwner medium
-      owner <- runDB $ getJust ownerId
-      msu <- lookupSession "userId"
-      case msu of
-        Just tempUserId -> do
-          userId <- return $ getUserIdFromText tempUserId
-          album <- runDB $ getJust $ mediumAlbum medium
-          presence <- return (userId == ownerId)
-          albumOwnerPresence <- return (userId == (albumOwner album))
-          case presence || albumOwnerPresence of
-            True -> do
+  checkRes <- mediumCheck mediumId
+  case checkRes of
+    Right medium -> do
       (mediumSettingsWidget, enctype) <- generateFormPost $ mediumSettingsForm medium
       defaultLayout $ do
         setTitle "Eidolon :: Medium Settings"
         $(widgetFile "mediumSettings")
-            False -> do
-              setMessage "You must own this medium to change its settings"
-              redirect $ MediumR mediumId
-        Nothing -> do
-          setMessage "You must be logged in to change settings"
-          redirect $ LoginR
-    Nothing -> do
-      setMessage "This medium does not exist"
-      redirect $ HomeR
+    Left (errorMsg, route) -> do
+      setMessage errorMsg
+      redirect $ route
 
 postMediumSettingsR :: MediumId -> Handler Html
 postMediumSettingsR mediumId = do
-  tempMedium <- runDB $ get mediumId
-  case tempMedium of
-    Just medium -> do
-      ownerId <- return $ mediumOwner medium
-      owner <- runDB $ getJust ownerId
-      msu <- lookupSession "userId"
-      case msu of
-        Just tempUserId -> do
-          userId <- return $ getUserIdFromText tempUserId
-          album <- runDB $ getJust $ mediumAlbum medium
-          presence <- return (userId == ownerId)
-          albumOwnerPresence <- return (userId == (albumOwner album))
-          case presence || albumOwnerPresence of
-            True -> do
+  checkRes <- mediumCheck mediumId
+  case checkRes of
+    Right medium -> do
       ((result, mediumSettingsWidget), enctype) <- runFormPost $ mediumSettingsForm medium
       case result of
         FormSuccess temp -> do
@@ -64,15 +37,9 @@ postMediumSettingsR mediumId = do
         _ -> do
           setMessage "There was an error changing the settings"
           redirect $ MediumSettingsR mediumId
-            False -> do
-              setMessage "You must own this medium to change its settings"
-              redirect $ MediumR mediumId
-        Nothing -> do
-          setMessage "You must be logged in to change settings"
-          redirect $ LoginR
-    Nothing -> do
-      setMessage "This medium does not exist"
-      redirect $ HomeR
+    Left (errorMsg, route) -> do
+      setMessage errorMsg
+      redirect $ route
 
 mediumSettingsForm :: Medium -> Form Medium
 mediumSettingsForm medium = renderDivs $ Medium
@@ -88,45 +55,21 @@ mediumSettingsForm medium = renderDivs $ Medium
 
 getMediumDeleteR :: MediumId -> Handler Html
 getMediumDeleteR mediumId = do
-  tempMedium <- runDB $ get mediumId
-  case tempMedium of
-    Just medium -> do
-      ownerId <- return $ mediumOwner medium
-      owner <- runDB $ getJust ownerId
-      msu <- lookupSession "userId"
-      case msu of
-        Just tempUserId -> do
-          userId <- return $ getUserIdFromText tempUserId
-          presence <- return (userId == ownerId)
-          case presence of
-            True -> do
+  checkRes <- mediumCheck mediumId
+  case checkRes of
+    Right medium -> do
       defaultLayout $ do
         setTitle "Eidolon :: Delete Medium"
         $(widgetFile "mediumDelete")
-            False -> do
-              setMessage "You must own this medium to delete it"
-              redirect $ MediumR mediumId
-        Nothing -> do
-          setMessage "You must be logged in to delete media"
-          redirect $ LoginR
-    Nothing -> do
-      setMessage "This Medium does not exist"
-      redirect $ HomeR
+    Left (errorMsg, route) -> do
+      setMessage errorMsg
+      redirect $ route
 
 postMediumDeleteR :: MediumId -> Handler Html
 postMediumDeleteR mediumId = do
-  tempMedium <- runDB $ get mediumId
-  case tempMedium of
-    Just medium -> do
-      ownerId <- return $ mediumOwner medium
-      owner <- runDB $ getJust ownerId
-      msu <- lookupSession "userId"
-      case msu of
-        Just tempUserId -> do
-          userId <- return $ getUserIdFromText tempUserId
-          presence <- return (userId == ownerId)
-          case presence of
-            True -> do
+  checkRes <- mediumCheck mediumId
+  case checkRes of
+    Right medium -> do
       confirm <- lookupPostParam "confirm"
       case confirm of
         Just "confirm" -> do
@@ -148,12 +91,6 @@ postMediumDeleteR mediumId = do
         _ -> do
           setMessage "You must confirm the deletion"
           redirect $ MediumSettingsR mediumId
-            False -> do
-              setMessage "You must own this medium to delete it"
-              redirect $ MediumR mediumId
-        Nothing -> do
-          setMessage "You must be logged in to delete media"
-          redirect $ LoginR
-    Nothing -> do
-      setMessage "This Medium does not exist"
-      redirect $ HomeR
+    Left (errorMsg, route) -> do
+      setMessage errorMsg
+      redirect $ route

templates/mediumSettings.hamlet

@@ -6,5 +6,4 @@ $newline always
   <div>
     <input type=submit value="Change settings">
 
-$if presence == True
 <a href=@{MediumDeleteR mediumId}>Delete this image