eidolon/Handler/Commons.hs
2015-09-14 18:54:46 +02:00

80 lines
2.8 KiB
Haskell

-- eidolon -- A simple gallery in Haskell and Yesod
-- Copyright (C) 2015 Amedeo Molnár
--
-- This program is free software: you can redistribute it and/or modify
-- it under the terms of the GNU Affero General Public License as published
-- by the Free Software Foundation, either version 3 of the License, or
-- (at your option) any later version.
--
-- This program is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-- GNU Affero General Public License for more details.
--
-- You should have received a copy of the GNU Affero General Public License
-- along with this program. If not, see <http://www.gnu.org/licenses/>.
module Handler.Commons where
import Import
import Data.String
loginIsAdmin :: IsString t => Handler (Either (t, Route App) ())
loginIsAdmin = do
msu <- lookupSession "userId"
case msu of
Just tempUserId -> do
let userId = getUserIdFromText tempUserId
user <- runDB $ getJust userId
if
userAdmin user
then
return $ Right ()
else
return $ Left ("You have no admin rights", HomeR)
Nothing ->
return $ Left ("You are not logged in", LoginR)
profileCheck :: IsString t => UserId -> Handler (Either (t, Route App) User)
profileCheck userId = do
tempUser <- runDB $ get userId
case tempUser of
Just user -> do
msu <- lookupSession "userId"
case msu of
Just tempLoginId -> do
let loginId = getUserIdFromText tempLoginId
if
loginId == userId
then
return $ Right user
else
return $ Left ("You can only change your own profile settings", UserR $ userName user)
Nothing ->
return $ Left ("You nedd to be logged in to change settings", LoginR)
Nothing ->
return $ Left ("This user does not exist", HomeR)
mediumCheck :: IsString t => MediumId -> Handler (Either (t, Route App) Medium)
mediumCheck mediumId = do
tempMedium <- runDB $ get mediumId
case tempMedium of
Just medium -> do
let ownerId = mediumOwner medium
msu <- lookupSession "userId"
case msu of
Just tempUserId -> do
let userId = getUserIdFromText tempUserId
album <- runDB $ getJust $ mediumAlbum medium
let presence = userId == ownerId
let albumOwnerPresence = userId == albumOwner album
if
presence || albumOwnerPresence
then
return $ Right medium
else
return $ Left ("You must own this medium to change its settings", MediumR mediumId)
Nothing ->
return $ Left ("You must be logged in to change settings", LoginR)
Nothing ->
return $ Left ("This medium does not exist", HomeR)