WIP

- Relates to #2
2018-08-14 22:12:43 +03:00
49 changed files with 448 additions and 1337 deletions
--- a/.gitignore
+++ b/.gitignore
@ -1,6 +1,2 @@
 dist/
 config/config.dhall
-/ctags
-/TAGS
-/result*
-/backend/config
--- a/.travis.yml
+++ b/.travis.yml
@ -1,12 +0,0 @@
-language: nix
-
-os:
-  - linux
-
-before_script:
-  - mkdir -m 0755 -p /nix/var/nix/{profiles,gcroots}/per-user/$USER
-  - mkdir -p ~/.config/nixpkgs
-
-script:
-  - nix-build ./release.nix --option trusted-public-keys "masser-ebook-manager.cachix.org-1:mtFSkQ2MO5MvjUpulZoFKjKUIa8g8CTcdPVuJaPKS1w= cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=" --option binary-caches "https://masser-ebook-manager.cachix.org https://cache.nixos.org" -A ghc.backend -A ghc.frontend
-  - nix-build ./release.nix --option trusted-public-keys "masser-ebook-manager.cachix.org-1:mtFSkQ2MO5MvjUpulZoFKjKUIa8g8CTcdPVuJaPKS1w= cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=" --option binary-caches "https://masser-ebook-manager.cachix.org https://cache.nixos.org" -A ghcjs.frontend
--- a/backend/ChangeLog.md
+++ b/backend/ChangeLog.md
@ -1,5 +0,0 @@
-# Revision history for backend
-
-## 0.1.0.0 -- YYYY-mm-dd
-
-* First version. Released on an unsuspecting world.
--- a/backend/LICENSE
+++ b/backend/LICENSE
@ -1,30 +0,0 @@
-Copyright (c) 2018, Mats Rauhala
-
-All rights reserved.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions are met:
-
-    * Redistributions of source code must retain the above copyright
-      notice, this list of conditions and the following disclaimer.
-
-    * Redistributions in binary form must reproduce the above
-      copyright notice, this list of conditions and the following
-      disclaimer in the documentation and/or other materials provided
-      with the distribution.
-
-    * Neither the name of Mats Rauhala nor the names of other
-      contributors may be used to endorse or promote products derived
-      from this software without specific prior written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
--- a/backend/Setup.hs
+++ b/backend/Setup.hs
@ -1,2 +0,0 @@
-import Distribution.Simple
-main = defaultMain
--- a/backend/src/API.hs
+++ b/backend/src/API.hs
@ -1,48 +0,0 @@
-{-# LANGUAGE DataKinds             #-}
-{-# LANGUAGE DeriveGeneric         #-}
-{-# LANGUAGE FlexibleInstances     #-}
-{-# LANGUAGE MultiParamTypeClasses #-}
-{-# LANGUAGE NoImplicitPrelude     #-}
-{-# LANGUAGE OverloadedStrings     #-}
-{-# LANGUAGE QuasiQuotes           #-}
-{-# LANGUAGE RecordWildCards       #-}
-{-# LANGUAGE TemplateHaskell       #-}
-{-# LANGUAGE TypeFamilies          #-}
-{-# LANGUAGE TypeOperators         #-}
-module API (API, handler) where
-
-
-import           Servant
-import           Servant.HTML.Lucid (HTML)
-import           Types
-
-import           View
-
-import qualified API.Books          as Books
-import qualified API.Catalogue      as Catalogue
-import qualified API.Channels       as Channels
-import qualified API.Users          as Users
-
-data Index = Index
-
-type API = Users.API
-      :<|> "api" :> "current" :> Channels.API
-      :<|> "api" :> "current" :> Books.API
-      :<|> "api" :> "1" :> Catalogue.VersionedAPI 1
-      :<|> "api" :> "current" :> Catalogue.VersionedAPI 1
-
-handler :: ServerT API AppM
-handler = Users.handler
-    :<|> Channels.handler
-    :<|> Books.handler
-    :<|> Catalogue.handler
-    :<|> Catalogue.handler
-
-instance ToHtml Index where
-  toHtml _ = do
-    h1_ [class_ "title"] "Home page"
-    p_ [class_ "subtitle"] "Hello world"
-  toHtmlRaw = toHtml
-
-indexHandler :: AppM (AppView Index)
-indexHandler = mkView "Home" Index
--- a/backend/src/API/Books.hs
+++ b/backend/src/API/Books.hs
@ -1,129 +0,0 @@
-{-# LANGUAGE DataKinds                  #-}
-{-# LANGUAGE DeriveGeneric              #-}
-{-# LANGUAGE DuplicateRecordFields      #-}
-{-# LANGUAGE FlexibleInstances          #-}
-{-# LANGUAGE GeneralizedNewtypeDeriving #-}
-{-# LANGUAGE MultiParamTypeClasses      #-}
-{-# LANGUAGE NamedFieldPuns             #-}
-{-# LANGUAGE NoImplicitPrelude          #-}
-{-# LANGUAGE OverloadedStrings          #-}
-{-# LANGUAGE QuasiQuotes                #-}
-{-# LANGUAGE RecordWildCards            #-}
-{-# LANGUAGE TemplateHaskell            #-}
-{-# LANGUAGE TypeApplications           #-}
-{-# LANGUAGE TypeFamilies               #-}
-{-# LANGUAGE TypeOperators              #-}
-module API.Books where
-
-import           ClassyPrelude
-import           Control.Lens
-import           Control.Monad.Catch       (MonadThrow, throwM)
-import           Control.Monad.Trans.Maybe
-import           Crypto.Hash               (digestFromByteString)
-import           Data.Aeson
-import           Data.ByteArray            (convert)
-import           Data.Generics.Product
-import           Database
-import           Database.Book
-import           Database.Channel
-import           Database.Tag
-import qualified Datastore                 as DS
-import           Servant                   hiding (contentType)
-import           Servant.Auth              as SA
-import qualified Servant.Docs              as Docs
-import           Server.Auth
-import           Types
-
-data JsonBook = JsonBook { identifier  :: BookID
-                         , contentType :: Text
-                         , title       :: Text
-                         , description :: Maybe Text
-                         , channels    :: [Text]
-                         , tags        :: [Text] }
-              deriving (Generic, Show, Eq)
-
-instance Docs.ToSample JsonBook where
-  toSamples _ = [("Book", JsonBook 13 "epub" "title" (Just "Description") [] [])]
-
-instance Docs.ToSample PostBook where
-  toSamples _ = [("Book", PostBook "epub" "title" (Just "Description") [] [])]
-
-data PostBook = PostBook { contentType :: Text
-                         , title       :: Text
-                         , description :: Maybe Text
-                         , channels    :: [Text]
-                         , tags        :: [Text] }
-              deriving (Generic, Show, Eq)
-
-
-instance ToJSON JsonBook
-instance FromJSON JsonBook
-instance ToJSON PostBook
-instance FromJSON PostBook
-
-type API = Auth '[SA.BasicAuth, SA.JWT] SafeUser :> BaseAPI
-
-instance Docs.ToCapture (Capture "book_id" BookID) where
-  toCapture _ = Docs.DocCapture "book_id" "The book id"
-
-type BaseAPI = "books" :> Get '[JSON] [JsonBook]
-       :<|> "books" :> ReqBody '[JSON] PostBook :> Post '[JSON] JsonBook
-       :<|> "books" :> Capture "book_id" BookID :> "meta" :> ReqBody '[JSON] JsonBook :> Put '[JSON] JsonBook
-       :<|> "books" :> Capture "book_id" BookID :> ReqBody '[OctetStream] FileContent :> Put '[JSON] NoContent
-       :<|> GetBook
-
-newtype FileContent = FileContent { getFileContent :: ByteString } deriving (MimeUnrender OctetStream, MimeRender OctetStream )
-
-instance Docs.ToSample FileContent where
-  toSamples _ = [("File contents", FileContent "bytes here and there")]
-
-type GetBook = "books" :> Capture "book_id" BookID :> Get '[OctetStream] FileContent
-
-handler :: ServerT API AppM
-handler user = listBooksHandler user
-          :<|> postBookMetaHandler user
-          :<|> putBookMetaHandler user
-          :<|> putBookContentHandler user
-          :<|> getBookContentHandler user
-
-getBookContentHandler :: AuthResult SafeUser -> BookID -> AppM FileContent
-getBookContentHandler auth bookId = requireBookOwner auth bookId $ \SafeUser{username} -> do
-  content <- runMaybeT $ do
-    Book{contentHash=mHash} <- MaybeT $ runDB (getBook bookId username)
-    contentHash <- MaybeT $ return (mHash >>= digestFromByteString . unHex)
-    FileContent <$> MaybeT (DS.get contentHash)
-  maybe (throwM err404) return content
-
-requireBookOwner :: AuthResult SafeUser -> BookID -> (SafeUser -> AppM a) -> AppM a
-requireBookOwner auth bookId f = flip requireLoggedIn auth $ \u@SafeUser{username} -> do
-  exists <- runDB $ bookExists bookId
-  unless exists $ throwM err404
-  runDB (isBookOwner bookId username) >>= \o -> if o then f u else throwM err403
-
-putBookContentHandler :: AuthResult SafeUser -> BookID -> FileContent -> AppM NoContent
-putBookContentHandler auth bookId fc = requireBookOwner auth bookId $ \SafeUser{username} -> do
-  let content = getFileContent fc
-  key <- HashDigest . convert <$> DS.put content
-  runDB (setContent bookId username key)
-  return NoContent
-
-postBookMetaHandler :: AuthResult SafeUser -> PostBook -> AppM JsonBook
-postBookMetaHandler auth PostBook{..} = flip requireLoggedIn auth $ \SafeUser{username} -> do
-  mIdentifier <- runDB $ insertBook InsertBook{owner=username,..}
-  maybe (throwM err403{errBody="Could not insert book"}) (\identifier -> pure JsonBook{..}) mIdentifier
-
-
-putBookMetaHandler :: AuthResult SafeUser -> BookID -> JsonBook -> AppM JsonBook
-putBookMetaHandler auth bookId JsonBook{..}
-  | bookId == identifier = requireBookOwner auth bookId $ \SafeUser{username=owner} ->
-        maybe (throwM err403) (return . view (super @JsonBook)) =<< runDB (updateBook UpdateBook{..})
-  | otherwise = throwM err403
-
-listBooksHandler :: AuthResult SafeUser -> AppM [JsonBook]
-listBooksHandler = requireLoggedIn $ \user -> do
-  runDB (usersBooks (view (field @"username") user) >>= mapM augment)
-    where
-      augment Book{identifier=bookId,contentType,title,description} = do
-        channels <- fmap (view (field @"channel")) <$> booksChannels bookId
-        tags <- fmap (view (field @"tag")) <$> booksTags bookId
-        pure JsonBook{identifier=bookId,..}
--- a/backend/src/API/Channels.hs
+++ b/backend/src/API/Channels.hs
@ -1,85 +0,0 @@
-{-# LANGUAGE DataKinds             #-}
-{-# LANGUAGE DeriveGeneric         #-}
-{-# LANGUAGE DuplicateRecordFields #-}
-{-# LANGUAGE FlexibleInstances     #-}
-{-# LANGUAGE MultiParamTypeClasses #-}
-{-# LANGUAGE NamedFieldPuns        #-}
-{-# LANGUAGE NoImplicitPrelude     #-}
-{-# LANGUAGE OverloadedStrings     #-}
-{-# LANGUAGE QuasiQuotes           #-}
-{-# LANGUAGE RecordWildCards       #-}
-{-# LANGUAGE TemplateHaskell       #-}
-{-# LANGUAGE TypeApplications      #-}
-{-# LANGUAGE TypeFamilies          #-}
-{-# LANGUAGE TypeOperators         #-}
-module API.Channels (API, handler, JsonChannel(..)) where
-
-import           ClassyPrelude
-import           Control.Lens
-import           Control.Monad.Catch   (MonadThrow, throwM)
-import           Control.Monad.Logger
-import           Data.Aeson
-import           Data.Generics.Product
-import           Database
-import           Database.Channel
-import           Servant
-import           Servant.Auth          as SA
-import qualified Servant.Docs          as Docs
-import           Server.Auth
-import           Types
-
-data JsonChannel = JsonChannel { channel    :: Text
-                               , visibility :: Visibility }
-                 deriving (Show, Generic)
-data UpdateChannel = UpdateChannel { identifier :: ChannelID
-                                   , channel    :: Text
-                                   , visibility :: Visibility }
-                 deriving (Show, Generic)
-
-instance Docs.ToSample JsonChannel where
-  toSamples _ = [("Channel", JsonChannel "channel" Private)]
-
-instance Docs.ToSample UpdateChannel where
-  toSamples _ = [("Channel", UpdateChannel 13 "channel" Private)]
-
-instance ToJSON JsonChannel
-instance FromJSON JsonChannel
-instance ToJSON UpdateChannel
-instance FromJSON UpdateChannel
-
-type API = Auth '[SA.BasicAuth, SA.Cookie, SA.JWT] SafeUser :> BaseAPI
-
-instance Docs.ToCapture (Capture "channel_id" ChannelID) where
-  toCapture _ = Docs.DocCapture "channel_id" "The channel id"
-
-type BaseAPI = "channels" :> ReqBody '[JSON] JsonChannel :> Post '[JSON] UpdateChannel
-          :<|> "channels" :> Capture "channel_id" ChannelID :> ReqBody '[JSON] UpdateChannel :> Put '[JSON] UpdateChannel
-          :<|> "channels" :> Get '[JSON] [JsonChannel]
-
-handler :: ServerT API AppM
-handler user = newChannelHandler user :<|> updateChannelHandler user :<|> listChannelsHandler user
-
-requireChannelOwner :: AuthResult SafeUser -> ChannelID -> (SafeUser -> AppM a) -> AppM a
-requireChannelOwner auth channelId f = flip requireLoggedIn auth $ \u@SafeUser{username} -> do
-  unlessM (runDB . channelExists $ channelId) $ throwM err404
-  runDB (isChannelOwner channelId username) >>= \o -> if o then f u else throwM err403
-
-updateChannelHandler :: AuthResult SafeUser -> ChannelID -> UpdateChannel -> AppM UpdateChannel
-updateChannelHandler auth channelId UpdateChannel{visibility} = requireChannelOwner auth channelId $ \_ -> do
-  mChannel <- fmap toChannel <$> runDB (updateChannelPrivacy channelId visibility)
-  maybe (throwM err403) return mChannel
-
-listChannelsHandler :: AuthResult SafeUser -> AppM [JsonChannel]
-listChannelsHandler = requireLoggedIn $ \user ->
-  -- I could use the super thing from generic-lens, but then I would need to
-  -- use the 'channel' accessor somehow or export it
-  fmap (\Channel{..} -> JsonChannel{..}) <$> runDB (userChannels (view (field @"username") user))
-
-newChannelHandler :: AuthResult SafeUser -> JsonChannel -> AppM UpdateChannel
-newChannelHandler auth JsonChannel{..} = flip requireLoggedIn auth $ \user -> do
-  $logInfo $ "Creating channel for user " <> pack (show user)
-  mChannel <- fmap toChannel <$> runDB (insertChannel (view (field @"username") user) channel visibility)
-  maybe (throwM err403{errBody="Could not create the channel"}) return mChannel
-
-toChannel :: Channel -> UpdateChannel
-toChannel Channel{..} = UpdateChannel{..}
--- a/backend/src/Database/Channel.hs
+++ b/backend/src/Database/Channel.hs
@ -1,128 +0,0 @@
-{-# Language TypeApplications #-}
-{-# Language DataKinds #-}
-{-# Language NamedFieldPuns #-}
-module Database.Channel
-  ( userChannels
-  , insertChannel
-  , channelExists
-  , isChannelOwner
-  , updateChannelPrivacy
-  , attachChannel
-  , Visibility(..)
-  , clearChannels
-  , booksChannels
-  , channelBooks
-  , Channel(..)
-  , ChannelID(..) )
-  where
-
-import ClassyPrelude
-import Control.Monad.Catch (MonadMask)
-import Database
-import Database.Schema
-import Database.Selda
-import Database.Selda.Generic
-
-import Control.Monad.Trans.Maybe
-
-getChannel :: (MonadSelda m, MonadIO m) => ChannelID -> m (Maybe Channel)
-getChannel identifier = listToMaybe . fromRels <$> query q
-  where
-    q = do
-      ch@(channelId :*: _) <- select (gen channels)
-      restrict (channelId .== literal identifier)
-      return ch
-
-channelExists :: (MonadSelda m, MonadIO m) => ChannelID -> m Bool
-channelExists identifier = not . null <$> getChannel identifier
-
-isChannelOwner :: (MonadSelda m, MonadIO m) => ChannelID -> Username -> m Bool
-isChannelOwner identifier username = not . null <$> query q
-  where
-    q = do
-      userId :*: _ :*: username' :*: _ <- select (gen users)
-      channelId :*: _ :*: channelOwner :*: _ <- select (gen channels)
-      restrict (userId .== channelOwner)
-      restrict (username' .== literal username)
-      restrict (channelId .== literal identifier)
-      return channelId
-
-userChannels :: (MonadMask m, MonadIO m) => Username -> SeldaT m [Channel]
-userChannels username = fromRels <$> query q
-  where
-    q = do
-      userId :*: _ :*: username' :*: _ <- select (gen users)
-      channel@(_ :*: _ :*: owner :*: _) <- select (gen channels)
-      restrict (owner .== userId)
-      restrict (username' .== literal username)
-      return channel
-
-updateChannelPrivacy :: (MonadIO m, MonadSelda m) => ChannelID -> Visibility -> m (Maybe Channel)
-updateChannelPrivacy channelId visibility = do
-  void $ update (gen channels) predicate (\channel -> channel `with` [pVis := literal visibility])
-  getChannel channelId
-  where
-    predicate (channelId' :*: _) = channelId' .== literal channelId
-    _ :*: _ :*: _ :*: pVis = selectors (gen channels)
-
-insertChannel :: (MonadMask m, MonadIO m, MonadSelda m) => Username -> Text -> Visibility -> m (Maybe Channel)
-insertChannel username channel visibility = runMaybeT $ do
-  userId <- MaybeT (listToMaybe <$> getUser)
-  channelId <- toChannelId <$> MaybeT (insertUnless (gen channels) (doesNotExist userId) [ def :*: channel :*: userId :*: visibility ])
-  MaybeT (listToMaybe . fromRels <$> query (q channelId))
-  where
-    q channelId = do
-      ch@(channelId' :*: _) <- select (gen channels)
-      restrict (channelId' .== literal channelId)
-      return ch
-    toChannelId = ChannelID . fromRowId
-    doesNotExist userId (_ :*: channel' :*: userId' :*: _) = channel' .== literal channel .&& userId' .== literal userId
-    getUser = query $ do
-      userId :*: _ :*: user :*: _ <- select (gen users)
-      restrict (user .== literal username)
-      return userId
-
-channelBooks :: (MonadSelda m, MonadIO m) => Username -> ChannelID -> m [Book]
-channelBooks username identifier = fromRels <$> query q
-  where
-    q = do
-      channelId :*: bookId' <- select (gen bookChannels)
-      channelId' :*: _ :*: owner :*: _ <- select (gen channels)
-      userId :*: _ :*: username' :*: _ <- select (gen users)
-      book@(bookId :*: _) <- select (gen books)
-      restrict (username' .== literal username .&& owner .== userId)
-      restrict (channelId .== literal identifier .&& channelId .== channelId')
-      restrict (bookId .== bookId')
-      return book
-
-booksChannels :: (MonadSelda m, MonadIO m) => BookID -> m [Channel]
-booksChannels bookId = fromRels <$> query q
-  where
-    q = do
-      channelId :*: bookId' <- select (gen bookChannels)
-      ch@(channelId' :*: _) <- select (gen channels)
-      restrict (channelId .== channelId')
-      restrict (bookId' .== literal bookId)
-      return ch
-
-attachChannel :: (MonadIO m, MonadSelda m) => Username -> BookID -> Text -> m ()
-attachChannel username bookId channel = do
-  mCh <- fromRels <$> query channelQ
-  forM_ mCh $ \Channel{identifier} ->
-    whenM (null <$> query (attachQ identifier)) $
-      void $ insertGen bookChannels [BookChannel identifier bookId]
-  where
-    attachQ channelId = do
-      (channelId' :*: bookId') <- select (gen bookChannels)
-      restrict (channelId' .== literal channelId .&& bookId' .== literal bookId)
-      return channelId'
-    channelQ = do
-      userId :*: _ :*: username' :*: _ <- select (gen users)
-      ch@(_ :*: channel' :*: owner :*: _) <- select (gen channels)
-      restrict (username' .== literal username)
-      restrict (owner .== userId)
-      restrict (channel' .== literal channel)
-      return ch
-
-clearChannels :: (MonadIO m, MonadSelda m) => BookID -> m Int
-clearChannels bookId = deleteFrom (gen bookChannels) (\(_ :*: bookId') -> bookId' .== literal bookId)
--- a/backend/src/Database/Tag.hs
+++ b/backend/src/Database/Tag.hs
@ -1,62 +0,0 @@
-{-# Language TypeApplications #-}
-{-# Language TypeOperators #-}
-{-# Language DataKinds #-}
-{-# Language DuplicateRecordFields #-}
-{-# Language NamedFieldPuns #-}
-module Database.Tag
-  ( def
-  , booksTags
-  , attachTag
-  , upsertTag
-  , clearTags
-  , Tag(..) ) where
-
-import ClassyPrelude
-import Control.Monad.Catch (MonadCatch)
-import Control.Monad.Trans.Maybe
-import Database
-import Database.Schema
-import Database.Selda
-import Database.Selda.Generic
-
-upsertTag :: (MonadCatch m, MonadIO m, MonadSelda m) => Username -> Text -> m (Maybe Tag)
-upsertTag username tag = runMaybeT $ do
-  userId <- MaybeT (listToMaybe <$> query userQ)
-  void $ lift $ upsert (gen tags) (predicate userId) id [toRel (Tag def tag userId)]
-  MaybeT (listToMaybe . fromRels <$> query (tagQ userId))
-  where
-    predicate userId (_ :*: tag' :*: owner) = tag' .== literal tag .&& owner .== literal userId
-    tagQ userId = do
-      t@(_ :*: tag' :*: owner) <- select (gen tags)
-      restrict (tag' .== literal tag .&& owner .== literal userId)
-      return t
-    userQ = do
-      userId :*: _ :*: username' :*: _ <- select (gen users)
-      restrict (username' .== literal username)
-      return userId
-
-booksTags :: (MonadIO m, MonadSelda m) => BookID -> m [Tag]
-booksTags bookId = fromRels <$> query q
-  where
-    q = do
-      tagId :*: bookId' <- select (gen bookTags)
-      tag@(tagId' :*: _) <- select (gen tags)
-      restrict (tagId .== tagId')
-      restrict (bookId' .== literal bookId)
-      return tag
-
-attachTag :: (MonadCatch m, MonadIO m, MonadSelda m) => Username -> BookID -> Text -> m ()
-attachTag username bookId tag = do
-  maybeT <- upsertTag username tag
-  forM_ maybeT $ \Tag{identifier} -> do
-    whenM (null <$> query (tagQ identifier)) $
-      void $ insertGen bookTags [BookTag identifier bookId]
-  where
-    tagQ tagId = do
-      (tagId' :*: bookId') <- select (gen bookTags)
-      restrict (tagId' .== literal tagId .&& bookId' .== literal bookId)
-      return tagId'
-
-clearTags :: (MonadIO m, MonadSelda m) => BookID -> m Int
-clearTags bookId = deleteFrom (gen bookTags) (\(_ :*: bookId') -> bookId' .== literal bookId)
-
--- a/backend/src/Server.hs
+++ b/backend/src/Server.hs
@ -1,51 +0,0 @@
-{-# LANGUAGE DataKinds             #-}
-{-# LANGUAGE DeriveGeneric         #-}
-{-# LANGUAGE FlexibleInstances     #-}
-{-# LANGUAGE MultiParamTypeClasses #-}
-{-# LANGUAGE NoImplicitPrelude     #-}
-{-# LANGUAGE OverloadedStrings     #-}
-{-# LANGUAGE QuasiQuotes           #-}
-{-# LANGUAGE RecordWildCards       #-}
-{-# LANGUAGE ScopedTypeVariables   #-}
-{-# LANGUAGE TemplateHaskell       #-}
-{-# LANGUAGE TypeApplications      #-}
-{-# LANGUAGE TypeFamilies          #-}
-{-# LANGUAGE TypeOperators         #-}
-module Server where
-
-import qualified API                   as API
-import           ClassyPrelude         hiding (Handler)
-import           Control.Lens
-import           Control.Monad.Except
-import           Control.Monad.Logger
-import           Data.Generics.Product
-import           Servant
-import           Servant.Auth.Docs     ()
-import           Servant.Auth.Server   as SAS
-import qualified Servant.Docs          as Docs
-import           Servant.HTML.Lucid    (HTML)
-import           Server.Auth           (SafeUser)
-import           Server.Auth           (authCheck)
-import           Types
-
-type API = API.API
-  :<|> "help" :> Get '[PlainText, HTML] String
-  :<|> "static" :> Raw
-
-type Ctx = '[BasicAuthData -> IO (AuthResult SafeUser), CookieSettings, JWTSettings]
-
-server :: App -> Application
-server app = serveWithContext api cfg (hoistServerWithContext (Proxy @ API.API) (Proxy @ Ctx) server' API.handler :<|> serveDocs :<|> serveDirectoryFileServer "static")
-  where
-    apiDocs :: Docs.API
-    apiDocs = Docs.docs (Proxy @API.API)
-    serveDocs = pure $ Docs.markdown apiDocs
-    myKey = view (field @"jwk") app
-    jwtCfg = defaultJWTSettings myKey
-    authCfg = authCheck app
-    cookieSettings = SAS.defaultCookieSettings{cookieIsSecure=SAS.NotSecure}
-    cfg = jwtCfg :. cookieSettings :. authCfg :. EmptyContext
-    server' :: AppM a -> Servant.Handler a
-    server' = Handler . ExceptT . try . (`runReaderT` app) . (runFileLoggingT "logs/server.log")
-    api :: Proxy API
-    api = Proxy
--- a/backend/src/Spec.hs
+++ b/backend/src/Spec.hs
@ -1,65 +0,0 @@
-{-# Language TypeApplications #-}
-module Main where
-
-import           API.Books
-import qualified Data.Aeson as A
-import           Data.Char (isPrint)
-import           Data.GenValidity.Text ()
-import qualified Data.Text as T
-import           Database.Schema
-import           Prelude
-import           Test.Hspec
-import           Test.Validity
-
-instance GenUnchecked PlainPassword
-instance GenValid PlainPassword
-instance GenInvalid PlainPassword
-instance Validity PlainPassword
-instance GenUnchecked Email
-instance GenValid Email
-instance GenInvalid Email
-instance Validity Email
-instance GenUnchecked Username
-instance GenValid Username
-instance GenInvalid Username
-instance Validity Username
-instance GenUnchecked BookID
-instance GenValid BookID
-instance GenInvalid BookID
-instance Validity BookID
-instance GenUnchecked ChannelID
-instance GenValid ChannelID
-instance GenInvalid ChannelID
-instance Validity ChannelID
-instance GenUnchecked Role
-instance GenValid Role
-instance GenInvalid Role
-instance Validity Role
-instance GenUnchecked Visibility
-instance GenValid Visibility
-instance GenInvalid Visibility
-instance Validity Visibility
-instance GenUnchecked JsonBook
-instance GenValid JsonBook
-instance GenInvalid JsonBook
-instance Validity JsonBook
-instance GenUnchecked PostBook
-instance GenValid PostBook
-instance GenInvalid PostBook
-instance Validity PostBook
-
-spec :: Spec
-spec = do
-  describe "JSON encoding" $ do
-    it "Works for PlainPassword" $ inverseFunctionsIfSecondSucceedsOnValid (A.encode @PlainPassword) A.decode
-    it "Works for Email" $ inverseFunctionsIfSecondSucceedsOnValid (A.encode @Email) A.decode
-    it "Username" $ inverseFunctionsIfSecondSucceedsOnValid (A.encode @Username) A.decode
-    it "Works for BookID" $ inverseFunctionsIfSecondSucceedsOnValid (A.encode @BookID) A.decode
-    it "Works for ChannelID" $ inverseFunctionsIfSecondSucceedsOnValid (A.encode @ChannelID) A.decode
-    it "Works for Role" $ inverseFunctionsIfSecondSucceedsOnValid (A.encode @Role) A.decode
-    it "Works for Visibility" $ inverseFunctionsIfSecondSucceedsOnValid (A.encode @Visibility) A.decode
-    it "Works for JsonBook" $ inverseFunctionsIfSecondSucceedsOnValid (A.encode @JsonBook) A.decode
-    it "Works for PostBook" $ inverseFunctionsIfSecondSucceedsOnValid (A.encode @PostBook) A.decode
-
-main :: IO ()
-main = hspec spec
--- a/common/LICENSE
+++ b/common/LICENSE
@ -1,30 +0,0 @@
-Copyright (c) 2018, Mats Rauhala
-
-All rights reserved.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions are met:
-
-    * Redistributions of source code must retain the above copyright
-      notice, this list of conditions and the following disclaimer.
-
-    * Redistributions in binary form must reproduce the above
-      copyright notice, this list of conditions and the following
-      disclaimer in the documentation and/or other materials provided
-      with the distribution.
-
-    * Neither the name of Mats Rauhala nor the names of other
-      contributors may be used to endorse or promote products derived
-      from this software without specific prior written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
--- a/common/common.cabal
+++ b/common/common.cabal
@ -1,47 +0,0 @@
-name:                common
-version:             0.1.0.0
-- synopsis:
-- description:
-license:             BSD3
-license-file:        LICENSE
-author:              Mats Rauhala
-maintainer:          mats.rauhala@iki.fi
-- copyright:
-category:            Web
-build-type:          Simple
-extra-source-files:  ChangeLog.md
-cabal-version:       >=1.10
-
-library
-  exposed-modules:     Data.Versioned
-  -- other-extensions:
-  build-depends:       base >=4.10
-                     , classy-prelude
-                     , generic-lens
-                     , lens
-                     , mtl
-                     , text
-                     , transformers
-  hs-source-dirs:      src
-  default-extensions:  DeriveGeneric
-                     , NoImplicitPrelude
-                     , OverloadedStrings
-                     , RecordWildCards
-  default-language:    Haskell2010
-
-- test-suite spec
--   type:                exitcode-stdio-1.0
--   main-is:             Spec.hs
--   hs-source-dirs:      src
--   build-depends:       base >=4.10
--                      , classy-prelude
--                      , foreign-store
--                      , generic-lens
--                      , lens
--                      , mtl
--                      , text
--                      , transformers
--                      , validity
--                      , genvalidity-hspec
--                      , genvalidity-property
--                      , hspec
--- a/common/src/Spec.hs
+++ b/common/src/Spec.hs
@ -1,9 +0,0 @@
-module Main where
-
-import Test.Hspec
-
-spec :: Spec
-spec = describe "test" $ it "verifies tests work" $ True == True
-
-main :: IO ()
-main = hspec spec
--- a/default.nix
+++ b/default.nix
@ -1,62 +1,10 @@
-{ nixpkgs, haskellPackages }:
-
-let
-  miso = nixpkgs.fetchFromGitHub {
-    owner = "dmjio";
-    repo = "miso";
-    rev = "630e823dd40a434b73124e12b229a79d9fefb01d";
-    sha256 = "046gdp3ah2lsipfcy89rh20mn08xbhcgrj549v8zzy69j33xjm2l";
-  };
-  miso-jsaddle = super: if haskellPackages.ghc.isGhcjs or false then (super.callPackage (miso + "/miso-ghcjs.nix") {}) else (super.callPackage (miso + "/miso-ghc-jsaddle.nix") {});
-
-  dontCheck = nixpkgs.haskell.lib.dontCheck;
-
-in
-
-(import ./project.nix nixpkgs) {
-  haskellPackages = haskellPackages;
-  packages = {
-    common = ./common;
-    backend = ./backend;
-    frontend = ./frontend;
-  };
-  overrides = self: super: {
-    generic-lens = nixpkgs.haskell.lib.dontCheck super.generic-lens;
-    miso = miso-jsaddle super;
-    # doctest = null; # Not compilable with ghcjs
-    # comonad = dontCheck super.comonad;
-    # Glob = dontCheck super.Glob;
-    # SHA = dontCheck super.SHA;
-    # iproute = dontCheck super.iproute;
-    # semigroupoids = dontCheck super.semigroupoids;
-    # wai-app-static = dontCheck super.wai-app-static;
-    # attoparsec = dontCheck super.attoparsec;
-    # http-date = dontCheck super.http-date;
-    # lens = dontCheck super.lens;
-    # unix-time = dontCheck super.unix-time;
-    # http-types = dontCheck super.http-types;
-    # servant = dontCheck super.servant;
-    # servant-server = dontCheck super.servant-server;
-    # servant-auth-docs = dontCheck super.servant-auth-docs;
-    # lens-aeson = dontCheck super.lens-aeson;
-    # word8 = dontCheck super.word8;
-    # http2 = dontCheck super.http2;
-    # wai-extra = dontCheck super.wai-extra;
-    # pgp-wordlist = dontCheck super.pgp-wordlist;
-    # prettyprinter = dontCheck super.prettyprinter;
-    # unliftio = dontCheck super.unliftio;
-    # prettyprinter-ansi-terminal = dontCheck super.prettyprinter-ansi-terminal;
-    # distributive = dontCheck super.distributive;
-    # genvalidity-property = dontCheck super.genvalidity-property;
-    # genvalidity-hspec = dontCheck super.genvalidity-hspec;
-    # genvalidity = dontCheck super.genvalidity;
-    # megaparsec = dontCheck super.megaparsec;
-    # ncurses = null;
-    # haskeline = super.callHackage "haskeline" "0.7.4.2" {};
-    # terminfo = super.callHackage "terminfo" "0.4.1.1" {};
-  };
-  tools = with haskellPackages; [
-    ghcid
-    hasktags
-  ];
+{ mkDerivation, base, stdenv }:
+mkDerivation {
+  pname = "ebook-manager";
+  version = "0.1.0.0";
+  src = ./.;
+  isLibrary = false;
+  isExecutable = true;
+  executableHaskellDepends = [ base ];
+  license = stdenv.lib.licenses.bsd3;
 }
--- a/backend/backend.cabal
+++ b/backend/backend.cabal
@ -1,7 +1,4 @@
-- Initial backend.cabal generated by cabal init.  For further
-- documentation, see http://haskell.org/cabal/users-guide/
-
-name:                backend
+name:                ebook-manager
 version:             0.1.0.0
 -- synopsis:
 -- description:
@ -15,7 +12,7 @@ build-type:          Simple
 extra-source-files:  ChangeLog.md
 cabal-version:       >=1.10

-executable backend
+executable ebook-manager
  main-is:             Main.hs
  other-modules:       Devel.Main
                     , API
@ -24,10 +21,10 @@ executable backend
                     , API.Channels
                     , API.Users
                     , Configuration
+                     , Data.Versioned
                     , Database
                     , Database.Book
                     , Database.Channel
-                     , Database.Tag
                     , Database.Schema
                     , Database.User
                     , Datastore
@ -37,10 +34,7 @@ executable backend
                     , Types
                     , View
  -- other-extensions:
-  build-depends:       base >=4.10
-                     , exceptions
-                     , monad-control
-                     , common
+  build-depends:       base >=4.10 && <4.11
                     , aeson
                     , asn1-data
                     , asn1-types
@ -69,7 +63,6 @@ executable backend
                     , servant
                     , servant-auth
                     , servant-auth-server
-                     , servant-auth-docs
                     , servant-docs
                     , servant-lucid
                     , servant-multipart
@ -83,67 +76,8 @@ executable backend
                     , xml-conduit
                     , xml-hamlet
  hs-source-dirs:      src
+  default-extensions:  DeriveGeneric
+                     , NoImplicitPrelude
+                     , OverloadedStrings
+                     , RecordWildCards
  default-language:    Haskell2010
-  default-extensions:  DeriveGeneric
-                     , NoImplicitPrelude
-                     , OverloadedStrings
-                     , RecordWildCards
-
-test-suite spec
-  type:                exitcode-stdio-1.0
-  main-is:             Spec.hs
-  hs-source-dirs:      src
-  build-depends:       base >=4.10
-                     , exceptions
-                     , monad-control
-                     , common
-                     , aeson
-                     , asn1-data
-                     , asn1-types
-                     , bytestring
-                     , classy-prelude
-                     , cryptonite
-                     , dhall
-                     , directory
-                     , foreign-store
-                     , generic-lens
-                     , http-api-data
-                     , http-media
-                     , jose
-                     , lens
-                     , lucid
-                     , memory
-                     , monad-logger
-                     , mtl
-                     , pandoc
-                     , pandoc-types
-                     , pem
-                     , process
-                     , resource-pool
-                     , selda
-                     , selda-postgresql
-                     , servant
-                     , servant-auth
-                     , servant-auth-server
-                     , servant-docs
-                     , servant-auth-docs
-                     , servant-lucid
-                     , servant-multipart
-                     , servant-server
-                     , text
-                     , transformers
-                     , wai
-                     , warp
-                     , x509
-                     , x509-store
-                     , xml-conduit
-                     , xml-hamlet
-                     , validity
-                     , genvalidity-hspec
-                     , genvalidity-property
-                     , genvalidity-text
-                     , hspec
-  default-extensions:  DeriveGeneric
-                     , NoImplicitPrelude
-                     , OverloadedStrings
-                     , RecordWildCards
--- a/frontend/ChangeLog.md
+++ b/frontend/ChangeLog.md
@ -1,5 +0,0 @@
-# Revision history for frontend
-
-## 0.1.0.0 -- YYYY-mm-dd
-
-* First version. Released on an unsuspecting world.
--- a/frontend/LICENSE
+++ b/frontend/LICENSE
@ -1,30 +0,0 @@
-Copyright (c) 2018, Mats Rauhala
-
-All rights reserved.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions are met:
-
-    * Redistributions of source code must retain the above copyright
-      notice, this list of conditions and the following disclaimer.
-
-    * Redistributions in binary form must reproduce the above
-      copyright notice, this list of conditions and the following
-      disclaimer in the documentation and/or other materials provided
-      with the distribution.
-
-    * Neither the name of Mats Rauhala nor the names of other
-      contributors may be used to endorse or promote products derived
-      from this software without specific prior written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
--- a/frontend/Setup.hs
+++ b/frontend/Setup.hs
@ -1,2 +0,0 @@
-import Distribution.Simple
-main = defaultMain
--- a/frontend/frontend.cabal
+++ b/frontend/frontend.cabal
@ -1,28 +0,0 @@
-- Initial frontend.cabal generated by cabal init.  For further
-- documentation, see http://haskell.org/cabal/users-guide/
-
-name:                frontend
-version:             0.1.0.0
-- synopsis:
-- description:
-license:             BSD3
-license-file:        LICENSE
-author:              Mats Rauhala
-maintainer:          mats.rauhala@iki.fi
-- copyright:
-category:            Web
-build-type:          Simple
-extra-source-files:  ChangeLog.md
-cabal-version:       >=1.10
-
-executable frontend
-  main-is:             Main.hs
-  -- other-modules:
-  -- other-extensions:
-  build-depends:       base >=4.11 && <4.12
-                     , miso
-                     , jsaddle-warp
-                     , mtl
-                     , common
-  hs-source-dirs:      src
-  default-language:    Haskell2010
--- a/frontend/src/Main.hs
+++ b/frontend/src/Main.hs
@ -1,41 +0,0 @@
-{-# LANGUAGE GeneralizedNewtypeDeriving #-}
-{-# LANGUAGE LambdaCase                 #-}
-{-# LANGUAGE OverloadedStrings          #-}
-{-# LANGUAGE RecordWildCards            #-}
-module Main where
-
-import           Control.Monad.Trans              (liftIO)
-import           Language.Javascript.JSaddle.Warp
-import           Miso
-import           Miso.String
-
-data Action = Add
-            | Subtract
-            | SayHello
-            | NoOp
-
-newtype Model = Model Int deriving (Eq, Num, ToMisoString)
-
-updateModel :: Action -> Model -> Effect Action Model
-updateModel Add m      = noEff (m + 1)
-updateModel Subtract m = noEff (m - 1)
-updateModel SayHello m = m <# (liftIO (putStrLn "Hello world") >> pure NoOp)
-updateModel NoOp m     = noEff m
-
-viewModel :: Model -> View Action
-viewModel x =
-  div_ [] [ button_  [ onClick Add ] [ text "+" ]
-          , text (ms x)
-          , button_ [ onClick Subtract ] [ text "-" ]
-  ]
-
-main :: IO ()
-main = run 8081 $ startApp App{..}
-  where
-    model = Model 0
-    initialAction = SayHello
-    update = updateModel
-    view = viewModel
-    subs = []
-    events = defaultEvents
-    mountPoint = Nothing
--- a/ghcjs.patch
+++ b/ghcjs.patch
@ -1,16 +0,0 @@
-diff --git a/lib/boot/shims/src/string.js b/lib/boot/shims/src/string.js
-index d82f75a..f16e55a 100644
--- a/lib/boot/shims/src/string.js
-+++ b/lib/boot/shims/src/string.js
-@@ -780,11 +780,7 @@ function h$throwJSException(e) {
-   // adding the Exception dictionary
-   var strVal = e.toString() + '\n' + Array.prototype.join.call(e.stack, '\n');
-   var someE = MK_SOMEEXCEPTION(HS_JSEXCEPTION_EXCEPTION,
-#ifdef GHCJS_PROF
-                               MK_JSEXCEPTION(MK_JSVAL(e), h$toHsString(strVal), h$CCS_SYSTEM))
-#else
-                                MK_JSEXCEPTION(MK_JSVAL(e), h$toHsString(strVal))
-#endif
-                               );
-   return h$throw(someE, true);
- }
--- a/jsaddle-warp-ghcjs.nix
+++ b/jsaddle-warp-ghcjs.nix
@ -1,14 +0,0 @@
-{ mkDerivation, base, fetchgit, stdenv }:
-mkDerivation {
-  pname = "jsaddle-warp";
-  version = "0.9.5.0";
-  src = fetchgit {
-    url = "https://github.com/ghcjs/jsaddle.git";
-    rev = "34fe7d61b3f387b81aa748294ac8d993243f53b4";
-    sha256 = "0qdh5qdk23vcp1yp910zgw2hs4zpbx9ig25xgaax0iwj2m1ifh5x";
-  };
-  postUnpack = "sourceRoot+=/jsaddle-warp; echo source root reset to $sourceRoot";
-  libraryHaskellDepends = [ base ];
-  description = "Interface for JavaScript that works with GHCJS and GHC";
-  license = stdenv.lib.licenses.mit;
-}
--- a/migrations/V1.1__Channel_visibility.sql
+++ b/migrations/V1.1__Channel_visibility.sql
@ -1 +0,0 @@
-alter table channels add column visibility text NOT NULL default 'Private';
--- a/migrations/V1.2__unique_tags.sql
+++ b/migrations/V1.2__unique_tags.sql
@ -1 +0,0 @@
-create unique index tag_owner on tags (tag, owner);
--- a/nixpkgs-version.json
+++ b/nixpkgs-version.json
@ -1,7 +1,7 @@
 {
  "url": "https://github.com/nixos/nixpkgs.git",
-  "rev": "4507926b80c6b8f73053775ffee17f6781c7e7c8",
+  "rev": "83a5765b1fea2472ec9cf9d179d3efd18b45c77e",
  "date": "2018-01-08T11:52:28+01:00",
-  "sha256": "068v9xh7d8klk62p2qwr76fyfqfh1bp08xc12x138g5q6pg6yfzb",
+  "sha256": "01rb61dkbzjbwnb3p8lgs03a94f4584199dlr0cwdmqzaxnp506h",
  "fetchSubmodules": true
 }
--- a/project.nix
+++ b/project.nix
@ -1,45 +0,0 @@
-nixpkgs:
-
-let
-
-  inherit (nixpkgs.lib) mapAttrs mapAttrsToList escapeShellArg optionalString concatStringsSep concatMapStringsSep;
-
-in
-
-{ haskellPackages
-, packages
-, overrides ? _ : _ : {}
-, tools ? []
-}:
-
-let
-
-  overrides' = nixpkgs.lib.foldr nixpkgs.lib.composeExtensions (_: _: {}) [
-    (self: super: mapAttrs (name: path: self.callCabal2nix name path {}) packages)
-    overrides
-  ];
-  haskellPackages' = haskellPackages.extend overrides';
-  packages' = mapAttrs (name: _: haskellPackages'."${name}") packages;
-  mkShell = name: pkg:
-  let
-    n =  "${name}-shell";
-    deps = with haskellPackages'; [
-      ghcid
-      cabal-install
-      hasktags
-      (haskellPackages'.ghcWithHoogle (pkgs: pkg.buildInputs ++ pkg.propagatedBuildInputs))
-    ];
-  in
-  {
-    name = "${n}";
-    value = nixpkgs.buildEnv {
-      name = "${n}";
-      paths = tools;
-      buildInputs = tools ++ [deps];
-    };
-  };
-  shells = nixpkgs.lib.listToAttrs (mapAttrsToList mkShell packages');
-
-in
-
-packages' // shells
--- a/release.nix
+++ b/release.nix
@ -1,72 +0,0 @@
-{ nixpkgs ? import <nixpkgs> {} }:
-
-let
-
-  jsaddle = nixpkgs.fetchFromGitHub {
-    owner = "ghcjs";
-    repo = "jsaddle";
-    rev = "34fe7d61b3f387b81aa748294ac8d993243f53b4";
-    sha256 = "0qdh5qdk23vcp1yp910zgw2hs4zpbx9ig25xgaax0iwj2m1ifh5x";
-  };
-  config = {
-    packageOverrides = pkgs: with pkgs.haskell.lib;  with pkgs.lib; {
-      haskell = pkgs.haskell // {
-        packages = pkgs.haskell.packages // {
-          ghccustom = pkgs.haskell.packages.ghc843.override {
-            overrides = self: super: {
-              jsaddle-warp = dontCheck (super.callPackage (jsaddle + "/jsaddle-warp") {});
-              # jsaddle-warp = super.callPackage ./jsaddle-warp-ghcjs.nix {};
-              jsaddle = dontCheck (super.callPackage (jsaddle + "/jsaddle") {});
-            };
-          };
-          ghcjscustom = pkgs.haskell.packages.ghcjs84.override {
-            overrides = self: super: {
-              doctest = null;
-              comonad = dontCheck (super.comonad);
-              classy-prelude = dontCheck (super.classy-prelude);
-              unliftio = dontCheck (super.unliftio);
-              semigroupoids = dontCheck (super.semigroupoids);
-              lens = dontCheck (super.lens);
-              directory-tree = dontCheck (super.directory-tree);
-              http-types = dontCheck (super.http-types);
-              tasty-quickcheck = dontCheck (super.tasty-quickcheck);
-              scientific = dontCheck (super.scientific);
-              servant = dontCheck (super.servant);
-              jsaddle-warp = super.callPackage ./jsaddle-warp-ghcjs.nix {};
-              ghc = overrideDerivation (super.ghc.override {
-                ghcjsSrc = pkgs.fetchgit {
-                  url = "https://github.com/ghcjs/ghcjs.git";
-                  rev = "dc190b1bb2453cfa484124e9f335ee3cad1492f7";
-                  sha256 = "0dh52gj0f3700zfyrhisy44b6y9p1bsawwrmd5pllpdyw21zd9lw";
-                  fetchSubmodules = true;
-                };
-              }) (drv: { patches = (drv.patches or []) ++ [ ./ghcjs.patch ]; });
-            };
-          };
-        };
-      };
-    };
-  };
-  pinnedVersion = nixpkgs.lib.importJSON ./nixpkgs-version.json;
-  pinnedPkgs = import (nixpkgs.fetchFromGitHub {
-    owner = "NixOS";
-    repo = "nixpkgs";
-    inherit (pinnedVersion) rev sha256;
-  }) { inherit config; };
-  ghc = import ./default.nix { nixpkgs = pinnedPkgs; haskellPackages = pinnedPkgs.haskell.packages.ghccustom; };
-  ghcjs = import ./default.nix { nixpkgs = pinnedPkgs; haskellPackages = pinnedPkgs.haskell.packages.ghcjscustom; };
-  inherit (pinnedPkgs) pkgs;
-
-  in
-
-{
-  inherit ghc ghcjs;
-  deps = pkgs.buildEnv {
-    name = "deps";
-    paths = [
-      (pkgs.haskell.packages.ghccustom.ghcWithPackages (_: ghc.backend.buildInputs ++ ghc.backend.propagatedBuildInputs))
-      (pkgs.haskell.packages.ghcjscustom.ghcWithPackages (_: ghcjs.frontend.buildInputs ++ ghcjs.frontend.propagatedBuildInputs))
-    ];
-    buildInputs = [ ];
-  };
-}
--- a/src/API.hs
+++ b/src/API.hs
@ -0,0 +1,50 @@
+{-# Language DataKinds #-}
+{-# Language TypeFamilies #-}
+{-# Language TypeOperators #-}
+{-# Language NoImplicitPrelude #-}
+{-# Language MultiParamTypeClasses #-}
+{-# Language OverloadedStrings #-}
+{-# Language TemplateHaskell #-}
+{-# Language QuasiQuotes #-}
+{-# Language RecordWildCards #-}
+{-# Language DeriveGeneric #-}
+{-# Language FlexibleInstances #-}
+module API (API, handler) where
+
+
+import Servant
+import Servant.HTML.Lucid (HTML)
+import Types
+
+import View
+
+import qualified API.Users as Users
+import qualified API.Channels as Channels
+import qualified API.Books as Books
+import qualified API.Catalogue as Catalogue
+
+data Index = Index
+
+type API = Get '[HTML] (AppView Index)
+      :<|> Users.API
+      :<|> "api" :> Channels.API
+      :<|> "api" :> Books.API
+      :<|> "api" :> "1" :> Catalogue.VersionedAPI 1
+      :<|> "api" :> "current" :> Catalogue.VersionedAPI 1
+
+handler :: ServerT API AppM
+handler = indexHandler
+    :<|> Users.handler
+    :<|> Channels.handler
+    :<|> Books.handler
+    :<|> Catalogue.handler
+    :<|> Catalogue.handler
+
+instance ToHtml Index where
+  toHtml _ = do
+    h1_ [class_ "title"] "Home page"
+    p_ [class_ "subtitle"] "Hello world"
+  toHtmlRaw = toHtml
+
+indexHandler :: AppM (AppView Index)
+indexHandler = mkView "Home" Index
--- a/src/API/Books.hs
+++ b/src/API/Books.hs
@ -0,0 +1,109 @@
+{-# Language DuplicateRecordFields #-}
+{-# Language DataKinds #-}
+{-# Language TypeFamilies #-}
+{-# Language TypeOperators #-}
+{-# Language NoImplicitPrelude #-}
+{-# Language MultiParamTypeClasses #-}
+{-# Language OverloadedStrings #-}
+{-# Language TemplateHaskell #-}
+{-# Language QuasiQuotes #-}
+{-# Language RecordWildCards #-}
+{-# Language DeriveGeneric #-}
+{-# Language FlexibleInstances #-}
+{-# Language TypeApplications #-}
+{-# Language DataKinds #-}
+{-# Language NamedFieldPuns #-}
+module API.Books where
+
+import Servant hiding (contentType)
+import Types
+import ClassyPrelude
+import Server.Auth
+import Servant.Auth as SA
+import Data.Aeson
+import API.Channels (JsonChannel(..))
+import Database.Book
+import Database.Channel
+import Database
+import Control.Lens
+import Data.Generics.Product
+
+import Control.Monad.Trans.Maybe
+
+import qualified Datastore as DS
+import Data.ByteArray (convert)
+import Crypto.Hash (digestFromByteString)
+
+data JsonBook = JsonBook { identifier :: BookID
+                         , contentType :: Text
+                         , title :: Maybe Text
+                         , description :: Maybe Text
+                         , channels :: [JsonChannel] }
+              deriving (Generic, Show)
+
+data PostBook = PostBook { contentType :: Text
+                         , title :: Maybe Text
+                         , description :: Maybe Text
+                         , channels :: [JsonChannel] }
+              deriving (Generic, Show)
+
+
+instance ToJSON JsonBook
+instance FromJSON JsonBook
+instance ToJSON PostBook
+instance FromJSON PostBook
+
+type API = Auth '[SA.BasicAuth, SA.JWT] SafeUser :> BaseAPI
+
+type BaseAPI = "books" :> Get '[JSON] [JsonBook]
+       :<|> "books" :> ReqBody '[JSON] PostBook :> Post '[JSON] JsonBook
+       :<|> "books" :> Capture "book_id" BookID :> "meta" :> ReqBody '[JSON] JsonBook :> Put '[JSON] JsonBook
+       :<|> "books" :> Capture "book_id" BookID :> ReqBody '[OctetStream] ByteString :> Put '[JSON] NoContent
+       :<|> "books" :> Capture "book_id" BookID :> Get '[OctetStream] ByteString
+
+handler :: ServerT API AppM
+handler user = listBooksHandler user
+          :<|> postBookMetaHandler user
+          :<|> putBookMetaHandler user
+          :<|> putBookContentHandler user
+          :<|> getBookContentHandler user
+
+getBookContentHandler :: AuthResult SafeUser -> BookID -> AppM ByteString
+getBookContentHandler auth bookId = requireBookOwner auth bookId $ \SafeUser{username} -> do
+  content <- runMaybeT $ do
+    Book{contentHash=mHash} <- MaybeT $ runDB (getBook bookId username)
+    contentHash <- MaybeT $ return (mHash >>= digestFromByteString . unHex)
+    MaybeT $ DS.get contentHash
+  maybe (throwM err404) return content
+
+requireBookOwner :: AuthResult SafeUser -> BookID -> (SafeUser -> AppM a) -> AppM a
+requireBookOwner auth bookId f = flip requireLoggedIn auth $ \u@SafeUser{username} -> do
+  exists <- runDB $ bookExists bookId
+  unless exists $ throwM err404
+  runDB (isBookOwner bookId username) >>= \o -> if o then f u else throwM err403
+
+putBookContentHandler :: AuthResult SafeUser -> BookID -> ByteString -> AppM NoContent
+putBookContentHandler auth bookId content = requireBookOwner auth bookId $ \SafeUser{username} -> do
+  key <- HashDigest . convert <$> DS.put content
+  runDB (setContent bookId username key)
+  return NoContent
+
+postBookMetaHandler :: AuthResult SafeUser -> PostBook -> AppM JsonBook
+postBookMetaHandler auth PostBook{..} = flip requireLoggedIn auth $ \SafeUser{username} -> do
+  mIdentifier <- runDB $ insertBook InsertBook{owner=username,..}
+  maybe (throwM err403{errBody="Could not insert book"}) (\identifier -> pure JsonBook{..}) mIdentifier
+
+
+putBookMetaHandler :: AuthResult SafeUser -> BookID -> JsonBook -> AppM JsonBook
+putBookMetaHandler auth bookId b@JsonBook{..}
+  | bookId == identifier = requireBookOwner auth bookId $ \SafeUser{username=owner} ->
+        maybe (throwM err403) (const (return b)) =<< runDB (updateBook UpdateBook{..})
+  | otherwise = throwM err403
+
+listBooksHandler :: AuthResult SafeUser -> AppM [JsonBook]
+listBooksHandler = requireLoggedIn $ \user -> do
+  runDB (usersBooks (view (field @"username") user) >>= mapM augment)
+    where
+      augment Book{identifier=bookId,contentType,title,description} = do
+        channels <- fmap (\Channel{..} -> JsonChannel{..}) <$> booksChannels bookId
+        pure JsonBook{identifier=bookId,..}
--- a/backend/src/API/Catalogue.hs
+++ b/backend/src/API/Catalogue.hs
@ -16,19 +16,15 @@
 {-# Language ScopedTypeVariables #-}
 module API.Catalogue (VersionedAPI, handler) where

-import qualified API.Books
-import           ClassyPrelude
-import           Database
-import           Database.Book (Book(..))
+import Types
+import Servant
+import ClassyPrelude
+import GHC.TypeLits
+import Server.Auth
+import Servant.Auth as SA
+import Servant.XML
 import qualified Database.Channel as Channel
-import           GHC.TypeLits
-import           Servant hiding (contentType)
-import           Servant.Auth as SA
-import qualified Servant.Docs as Docs
-import           Servant.XML
-import           Server.Auth
-import           System.IO.Unsafe (unsafePerformIO)
-import           Types
+import Database

 -- This is my first try on going to versioned apis, things might change
 -- I think my rule of thumb is that you can add new things as you want, but
@ -42,7 +38,7 @@ newtype Rel = Rel { unRel :: Text } deriving (IsString, Show)

 data Pagination = Pagination { previous :: Maybe Rel
                             , next :: Maybe Rel }
-                deriving (Show, Generic)
+                deriving (Show)

 newtype SubSection = SubSection Rel deriving (Show)
 newtype Acquisition = Acquisition Rel deriving (Show)
@ -66,20 +62,6 @@ deriving instance Show (Entry 1)
 deriving instance Generic (Catalog 1)
 deriving instance Generic (Entry 1)

-instance Docs.ToSample (Entry 1) where
-  toSamples _ = [("Entry", EntryV1 "title" "identifier" docsTime "content" (Left (SubSection (Rel "sub"))))]
-instance Docs.ToSample UTCTime where
-  toSamples _ = [("time", docsTime)]
-instance Docs.ToSample Rel where
-  toSamples _ = [("Relative link", Rel "next")]
-instance Docs.ToSample Pagination
-instance Docs.ToSample (Catalog 1) -- where
-  -- toSamples _ = [("catalog", CatalogV1 docsTime (Rel "prev") (Rel "next") (Pagination (Just "previous") (Just "next")) [])]
-
-docsTime :: UTCTime
-docsTime = unsafePerformIO getCurrentTime
-  
-
 instance ToNode SubSection where
  toNode (SubSection rel) = [xml|<link type="application/atom+xml;profile=opds-catalog;kind=acquisition" rel="subsection" href="#{unRel rel}">|]

@ -114,40 +96,18 @@ instance ToNode (Catalog 1) where

 class Monad m => VersionedCatalog m (v :: Nat) where
  getChannels :: SafeUser -> m (Catalog v)
-  getBooks :: Channel.ChannelID -> SafeUser -> m (Catalog v)

 instance VersionedCatalog AppM 1 where
  getChannels = getChannelsV1
-  getBooks = getBooksV1
-
-relUrl :: Link -> Rel
-relUrl x = Rel ("/api/current/" <> (pack . uriPath . linkURI $ x))
-
-getBooksV1 :: Channel.ChannelID -> SafeUser -> AppM (Catalog 1)
-getBooksV1 channelID SafeUser{username} = do
-  updated <- liftIO getCurrentTime
-  let self = relUrl selfUrl
-      start = relUrl startUrl
-      selfUrl = safeLink (Proxy @(BaseAPI 1)) (Proxy @(ChannelCatalog 1)) channelID
-      startUrl = safeLink (Proxy @(BaseAPI 1)) (Proxy @(RootCatalog 1))
-      pagination = Pagination Nothing Nothing
-  entries <- map (toEntry updated) <$> runDB (Channel.channelBooks username channelID)
-  pure CatalogV1{..}
-  where
-    toEntry updated Book{description,title,identifier=bookId} =
-      let content = fromMaybe "no content" description
-          identifier = pack . show $ bookId
-          link = Right (Acquisition (relUrl (safeLink (Proxy @API.Books.BaseAPI) (Proxy @API.Books.GetBook) bookId)))
-      in EntryV1{..}

 getChannelsV1 :: SafeUser -> AppM (Catalog 1)
 getChannelsV1 SafeUser{username} = do
  updated <- liftIO getCurrentTime
-  let self = relUrl selfUrl
+  let self = Rel ("/api/current/" <> selfUrl)
      -- I'm not sure if this safe link approach is really useable with this
      -- api hierarchy since I can't access the topmost api from here. Also
      -- authentication would bring a little bit of extra effort as well
-      selfUrl = safeLink (Proxy @(BaseAPI 1)) (Proxy @(RootCatalog 1))
+      selfUrl = pack . uriPath . linkURI $ safeLink (Proxy @(BaseAPI 1)) (Proxy @(RootCatalog 1))
      start = self
      pagination = Pagination Nothing Nothing
  entries <- map (fromChannel updated) <$> runDB (Channel.userChannels username)
@ -155,8 +115,8 @@ getChannelsV1 SafeUser{username} = do
  where
    fromChannel :: UTCTime -> Channel.Channel -> Entry 1
    fromChannel updated Channel.Channel{..} =
-      let url = safeLink (Proxy @(BaseAPI 1)) (Proxy @(ChannelCatalog 1)) identifier
-          self = relUrl url
+      let url = pack . uriPath . linkURI $ safeLink (Proxy @(BaseAPI 1)) (Proxy @(ChannelCatalog 1)) identifier
+          self = Rel ("/api/current/" <> url)
      in EntryV1 channel channel updated channel (Left $ SubSection self)

 type VersionedAPI (v :: Nat) = Auth '[SA.BasicAuth, SA.JWT] SafeUser :> BaseAPI v
@ -173,7 +133,7 @@ handler auth = catalogRoot :<|> catalogChannels
  where
    catalogChannels :: Channel.ChannelID -> AppM (Catalog v)
    -- Channel specific catalog returns tags inside the catalog
-    catalogChannels identifier = flip requireLoggedIn auth (getBooks identifier)
+    catalogChannels _ = throwM err403{errBody="Not implemented"}
    catalogRoot :: AppM (Catalog v)
    -- catalog root returns channels
    catalogRoot = flip requireLoggedIn auth getChannels
--- a/src/API/Channels.hs
+++ b/src/API/Channels.hs
@ -0,0 +1,51 @@
+{-# Language DataKinds #-}
+{-# Language TypeFamilies #-}
+{-# Language TypeOperators #-}
+{-# Language NoImplicitPrelude #-}
+{-# Language MultiParamTypeClasses #-}
+{-# Language OverloadedStrings #-}
+{-# Language TemplateHaskell #-}
+{-# Language QuasiQuotes #-}
+{-# Language RecordWildCards #-}
+{-# Language DeriveGeneric #-}
+{-# Language FlexibleInstances #-}
+{-# Language TypeApplications #-}
+{-# Language DataKinds #-}
+module API.Channels (API, handler, JsonChannel(..)) where
+
+import Servant
+import Types
+import ClassyPrelude
+import Server.Auth
+import Servant.Auth as SA
+import Control.Monad.Logger
+import Database
+import Database.Channel
+import Data.Aeson
+import Control.Lens
+import Data.Generics.Product
+
+data JsonChannel = JsonChannel { channel :: Text } deriving (Show, Generic)
+
+instance ToJSON JsonChannel
+instance FromJSON JsonChannel
+
+type API = Auth '[SA.BasicAuth, SA.Cookie, SA.JWT] SafeUser :> BaseAPI
+
+type BaseAPI = "channels" :> ReqBody '[JSON] JsonChannel :> Put '[JSON] JsonChannel
+          :<|> "channels" :> Get '[JSON] [JsonChannel]
+
+handler :: ServerT API AppM
+handler user = newChannelHandler user :<|> listChannelsHandler user
+
+listChannelsHandler :: AuthResult SafeUser -> AppM [JsonChannel]
+listChannelsHandler = requireLoggedIn $ \user ->
+  -- I could use the super thing from generic-lens, but then I would need to
+  -- use the 'channel' accessor somehow or export it
+  fmap (\Channel{..} -> JsonChannel{..}) <$> runDB (userChannels (view (field @"username") user))
+
+newChannelHandler :: AuthResult SafeUser -> JsonChannel -> AppM JsonChannel
+newChannelHandler auth ch@JsonChannel{..} = flip requireLoggedIn auth $ \user -> do
+  $logInfo $ "Creating channel for user " <> pack (show user)
+  runDB (insertChannel (view (field @"username") user) channel)
+  return ch
--- a/backend/src/API/Users.hs
+++ b/backend/src/API/Users.hs
@ -7,19 +7,17 @@
 {-# Language TypeApplications #-}
 module API.Users  where

-import           ClassyPrelude
-import           Control.Monad.Catch (throwM, MonadThrow)
-import           Data.Aeson
-import           Database (runDB)
-import           Database.Schema
-import           Database.User
-import           Servant
-import           Servant.Auth as SA
-import           Servant.Auth.Server as SAS
-import qualified Servant.Docs as Docs
-import           Server.Auth
-import           Types
-import           Web.FormUrlEncoded
+import Servant
+import ClassyPrelude
+import Types
+import Data.Aeson
+import Web.FormUrlEncoded
+import Database (runDB)
+import Database.User
+import Database.Schema
+import Server.Auth
+import Servant.Auth.Server as SAS
+import Servant.Auth as SA


 data RegisterForm = RegisterForm { username :: Username
@ -28,17 +26,12 @@ data RegisterForm = RegisterForm { username :: Username
                                 , passwordAgain :: PlainPassword }
                  deriving (Generic, Show)

-instance Docs.ToSample RegisterForm
-
 data LoginStatus = LoginStatus ( Maybe SafeUser ) deriving Generic

 data RegisterStatus = RegisterStatus deriving Generic

-instance Docs.ToSample RegisterStatus
-
 instance ToJSON LoginStatus
 instance FromJSON LoginStatus
-instance Docs.ToSample LoginStatus

 instance FromJSON RegisterForm
 instance ToJSON RegisterForm
--- a/backend/src/Configuration.hs
+++ b/backend/src/Configuration.hs
@ -12,9 +12,7 @@ data Pg = Pg { username :: Text
             , database :: Text }
        deriving (Show, Generic)

-data Store = Filestore { path :: Text }
-           | IPFS { common :: Text }
-           deriving (Show, Generic)
+newtype Store = Store { path :: Text } deriving (Show, Generic)

 data Config = Config { database :: Pg
                     , store :: Store }
@ -23,4 +21,3 @@ data Config = Config { database :: Pg
 instance Interpret Pg
 instance Interpret Store
 instance Interpret Config
-
--- a/common/src/Data/Versioned.hs
+++ b/common/src/Data/Versioned.hs
--- a/backend/src/Database.hs
+++ b/backend/src/Database.hs
@ -11,21 +11,18 @@ module Database
  , fromRel
  , fromRels
  , toRel
-  , transaction
  , SeldaT )
  where

-import ClassyPrelude
-import Control.Lens (view)
-import Control.Monad.Catch (MonadMask)
-import Control.Monad.Trans.Control (MonadBaseControl)
 import Data.Generics.Product
+import Control.Lens (view)
 import Data.Pool (Pool, withResource)
-import Database.Selda (query, select, transaction)
 import Database.Selda.Backend (SeldaConnection, runSeldaT, SeldaT)
+import Database.Selda (query, select)
 import Database.Selda.Generic (gen, fromRel, fromRels, toRel)
+import ClassyPrelude

-type DBLike r m = (MonadBaseControl IO m, MonadIO m, MonadReader r m, HasField "database" r r (Pool SeldaConnection) (Pool SeldaConnection), MonadMask m)
+type DBLike r m = (MonadIO m, MonadReader r m, MonadBaseControl IO m, MonadMask m, HasField' "database" r (Pool SeldaConnection))

 runDB :: DBLike r m => SeldaT m a -> m a
 runDB q = do
--- a/backend/src/Database/Book.hs
+++ b/backend/src/Database/Book.hs
@ -18,17 +18,12 @@ module Database.Book
  , BookID) where

 import ClassyPrelude
-import Control.Lens (view)
-import Control.Monad.Catch (MonadCatch)
-import Data.Generics.Product
+import Database.Schema
 import Database
-import Database.Channel (booksChannels, attachChannel, clearChannels)
-import Database.Schema (books, users, Username, Book(..), BookID(..), UserID, HashDigest(..))
 import Database.Selda
 import Database.Selda.Generic
-import Database.Tag (booksTags, attachTag, clearTags)

-usersBooks :: (MonadSelda m, MonadIO m) => Username -> m [Book]
+usersBooks :: (MonadSelda m, MonadMask m, MonadIO m) => Username -> m [Book]
 usersBooks username = fromRels <$> query q
  where
    q = do
@ -40,7 +35,7 @@ usersBooks username = fromRels <$> query q
      return book


-getBook :: (MonadSelda m, MonadIO m) => BookID -> Username -> m (Maybe Book)
+getBook :: (MonadSelda m, MonadMask m, MonadIO m) => BookID -> Username -> m (Maybe Book)
 getBook identifier owner = listToMaybe . fromRels <$> query q
  where
    q = do
@ -50,12 +45,12 @@ getBook identifier owner = listToMaybe . fromRels <$> query q
      return book

 data InsertBook = InsertBook { contentType :: Text
-                             , title :: Text
+                             , title :: Maybe Text
                             , description :: Maybe Text
                             , owner :: Username }

 -- Always inserts
-insertBook :: (MonadSelda m, MonadIO m) => InsertBook -> m (Maybe BookID)
+insertBook :: (MonadSelda m, MonadMask m, MonadIO m) => InsertBook -> m (Maybe BookID)
 insertBook InsertBook{..} = do
  mUserId <- query $ do
    userId :*: _ :*: username' :*: _ <- select (gen users)
@ -67,14 +62,11 @@ insertBook InsertBook{..} = do

 data UpdateBook = UpdateBook { identifier :: BookID
                             , contentType :: Text
-                             , title :: Text
+                             , title :: Maybe Text
                             , description :: Maybe Text
-                             , owner :: Username
-                             , tags :: [Text]
-                             , channels :: [Text] }
-                deriving (Show, Generic)
+                             , owner :: Username }

-bookExists :: (MonadSelda m, MonadIO m) => BookID -> m Bool
+bookExists :: (MonadSelda m, MonadMask m, MonadIO m) => BookID -> m Bool
 bookExists identifier = not . null <$> query q
  where
    q = do
@ -82,7 +74,7 @@ bookExists identifier = not . null <$> query q
      restrict (bookId .== literal identifier)
      return bookId

-isBookOwner :: (MonadSelda m, MonadIO m) => BookID -> Username -> m Bool
+isBookOwner :: (MonadSelda m, MonadIO m, MonadThrow m) => BookID -> Username -> m Bool
 isBookOwner identifier username = not . null <$> query (bookOwner' identifier username)

 bookOwner' :: BookID -> Username -> Query s (Col s UserID :*: Col s BookID)
@ -94,34 +86,19 @@ bookOwner' identifier username = do
  restrict (bookId .== literal identifier)
  return (userId :*: bookId)

-updateBook :: (MonadCatch m, MonadSelda m, MonadIO m) => UpdateBook -> m (Maybe UpdateBook)
-updateBook UpdateBook{..} = do
-  clearTags identifier >> connectTags
-  clearChannels identifier >> connectChannels
-  updateBook'
-  getUpdateBook identifier owner
+updateBook :: (MonadSelda m, MonadMask m, MonadIO m) => UpdateBook -> m (Maybe UpdateBook)
+updateBook book@UpdateBook{..} = do
+  mUserId <- query (bookOwner' identifier owner)
+  forM (listToMaybe mUserId) $ \_userId -> do
+    update_ (gen books) predicate (\b -> b `with` [ pContentType := literal contentType
+                                                  , pTitle := literal title
+                                                  , pDescription := literal description ])
+    return book
  where
-    connectTags = mapM_ (attachTag owner identifier) tags
-    connectChannels = mapM_ (attachChannel owner identifier) channels
-    updateBook' = do
-      mUserId <- query (bookOwner' identifier owner)
-      forM_ (listToMaybe mUserId) $ \_userId -> do
-        update_ (gen books) predicate (\b -> b `with` [ pContentType := literal contentType
-                                                      , pTitle := literal title
-                                                      , pDescription := literal description ])
    _ :*: _ :*: pContentType :*: pTitle :*: pDescription :*: _ = selectors (gen books)
    predicate (bookId :*: _) = bookId .== literal identifier

-
-getUpdateBook :: (MonadIO m, MonadSelda m) => BookID -> Username -> m (Maybe UpdateBook)
-getUpdateBook bookId username = do
-  mBook <- getBook bookId username
-  forM mBook $ \Book{..} -> do
-    channels <- map (view (field @"channel")) <$> booksChannels bookId
-    tags <- map (view (field @"tag")) <$> booksTags bookId
-    return UpdateBook{owner=username,..}
-
-setContent :: (MonadSelda m, MonadIO m) => BookID -> Username -> HashDigest -> m ()
+setContent :: (MonadSelda m, MonadMask m, MonadIO m) => BookID -> Username -> HashDigest -> m ()
 setContent identifier owner digest = do
  mOwner <- query (bookOwner' identifier owner)
  void $ forM (listToMaybe mOwner) $ \_ ->
--- a/src/Database/Channel.hs
+++ b/src/Database/Channel.hs
@ -0,0 +1,46 @@
+{-# Language TypeApplications #-}
+{-# Language DataKinds #-}
+module Database.Channel
+  ( userChannels
+  , insertChannel
+  , booksChannels
+  , Channel(..)
+  , ChannelID )
+  where
+
+import ClassyPrelude
+import Database.Schema
+import Database
+import Database.Selda
+
+userChannels :: (MonadMask m, MonadIO m) => Username -> SeldaT m [Channel]
+userChannels username = fromRels <$> query q
+  where
+    q = do
+      userId :*: _ :*: username' :*: _ <- select (gen users)
+      channel@(_ :*: _ :*: owner) <- select (gen channels)
+      restrict (owner .== userId)
+      restrict (username' .== literal username)
+      return channel
+
+insertChannel :: (MonadMask m, MonadIO m) => Username -> Text -> SeldaT m ()
+insertChannel username channel = do
+  mUserId <- listToMaybe <$> getUser
+  void $ forM mUserId $ \userId ->
+    insertUnless (gen channels) (doesNotExist userId) [ def :*: channel :*: userId ]
+  where
+    doesNotExist userId (_ :*: channel' :*: userId') = channel' .== literal channel .&& userId' .== literal userId
+    getUser = query $ do
+      userId :*: _ :*: user :*: _ <- select (gen users)
+      restrict (user .== literal username)
+      return userId
+
+booksChannels :: (MonadMask m, MonadIO m) => BookID -> SeldaT m [Channel]
+booksChannels contentHash = fromRels <$> query q
+  where
+    q = do
+      channelId :*: contentHash' <- select (gen bookChannels)
+      ch@(channelId' :*: _) <- select (gen channels)
+      restrict (channelId .== channelId')
+      restrict (contentHash' .== literal contentHash)
+      return ch
--- a/backend/src/Database/Schema.hs
+++ b/backend/src/Database/Schema.hs
@ -1,92 +1,83 @@
-{-# LANGUAGE DeriveGeneric              #-}
-{-# LANGUAGE DuplicateRecordFields      #-}
-{-# LANGUAGE GeneralizedNewtypeDeriving #-}
-{-# LANGUAGE NoImplicitPrelude          #-}
-{-# LANGUAGE OverloadedStrings          #-}
+{-# Language NoImplicitPrelude #-}
+{-# Language DeriveGeneric #-}
+{-# Language OverloadedStrings #-}
+{-# Language DuplicateRecordFields #-}
+{-# Language GeneralizedNewtypeDeriving #-}
 module Database.Schema where

-import           ClassyPrelude
-import           Data.Aeson
-import           Database.Selda
-import           Database.Selda.Backend
-import           Database.Selda.Generic
-import qualified Servant.Docs           as Docs
-import           Web.HttpApiData
+import ClassyPrelude
+import Database.Selda.Generic
+import Database.Selda
+import Database.Selda.Backend
+
+import Data.Aeson
+import Web.HttpApiData

 -- | User type
-newtype PlainPassword = PlainPassword Text deriving (Show, ToJSON, FromJSON, ToHttpApiData, FromHttpApiData, Eq, Generic)
+newtype PlainPassword = PlainPassword Text deriving (Show, ToJSON, FromJSON, ToHttpApiData, FromHttpApiData, Eq)
 newtype HashedPassword = HashedPassword {unHashed :: ByteString}
 data NoPassword = NoPassword

-newtype Email = Email { unEmail :: Text } deriving (Show, ToJSON, FromJSON, ToHttpApiData, FromHttpApiData, Generic, Eq, IsString)
+newtype Email = Email { unEmail :: Text } deriving (Show, ToJSON, FromJSON, ToHttpApiData, FromHttpApiData)

-newtype Username = Username { unUsername :: Text } deriving (Show, ToJSON, FromJSON, ToHttpApiData, FromHttpApiData, Eq, Generic, IsString)
-
-instance Docs.ToSample Username where
-  toSamples _ = [("Username", Username "user123")]
-
-instance Docs.ToSample Email where
-  toSamples _ = [("Email", Email "first.last@example.com")]
-
-instance Docs.ToSample PlainPassword where
-  toSamples _ = [("Password", PlainPassword "password123")]
+newtype Username = Username { unUsername :: Text } deriving (Show, ToJSON, FromJSON, ToHttpApiData, FromHttpApiData)

 instance SqlType HashedPassword where
  mkLit = LCustom . LBlob . unHashed
  fromSql (SqlBlob x) = HashedPassword x
-  fromSql _           = error "fromSql: Bad hash"
+  fromSql _ = error "fromSql: Bad hash"
  defaultValue = mkLit (HashedPassword "") -- Makes no sense

 instance SqlType Email where
  mkLit = LCustom . LText . unEmail
  fromSql (SqlString x) = Email x
-  fromSql _             = error "fromSql: Bad email"
+  fromSql _ = error "fromSql: Bad email"
  defaultValue = mkLit (Email "")

 instance SqlType Username where
  mkLit = LCustom . LText . unUsername
  fromSql (SqlString x) = Username x
-  fromSql _             = error "fromSql: Bad username"
+  fromSql _ = error "fromSql: Bad username"
  defaultValue = mkLit (Username "")

 newtype UserID = UserID {unUserID :: Int} deriving (Show)

-newtype BookID = BookID {unBookID :: Int} deriving (Show, ToJSON, FromJSON, FromHttpApiData, Eq, Ord, ToHttpApiData, Generic, Num)
+newtype BookID = BookID {unBookID :: Int} deriving (Show, ToJSON, FromJSON, FromHttpApiData, Eq, Ord)

-newtype ChannelID = ChannelID {unChannelID :: Int} deriving (Show, ToHttpApiData, FromHttpApiData, ToJSON, FromJSON, Eq, Generic, Num)
+newtype ChannelID = ChannelID {unChannelID :: Int} deriving (Show, ToHttpApiData, FromHttpApiData)

 newtype TagID = TagID {unTagID :: Int} deriving (Show)

 instance SqlType UserID where
  mkLit = LCustom . LInt . unUserID
  fromSql (SqlInt x) = UserID x
-  fromSql _          = error "fromSql: Bad userid"
+  fromSql _ = error "fromSql: Bad userid"
  sqlType _ = TRowID
  defaultValue = mkLit (UserID (-1))
 instance SqlType BookID where
  mkLit = LCustom . LInt . unBookID
  fromSql (SqlInt x) = BookID x
-  fromSql _          = error "fromSql: Bad bookid"
+  fromSql _ = error "fromSql: Bad bookid"
  defaultValue = mkLit (BookID (-1))
 instance SqlType ChannelID where
  mkLit = LCustom . LInt . unChannelID
  fromSql (SqlInt x) = ChannelID x
-  fromSql _          = error "fromSql: Bad channelid"
+  fromSql _ = error "fromSql: Bad channelid"
  defaultValue = mkLit (ChannelID (-1))
 instance SqlType TagID where
  mkLit = LCustom . LInt . unTagID
  fromSql (SqlInt x) = TagID x
-  fromSql _          = error "fromSql: Bad tagid"
+  fromSql _ = error "fromSql: Bad tagid"
  defaultValue = mkLit (TagID (-1))

 data User pass = User { identifier :: UserID
-                      , email      :: Email
-                      , username   :: Username
-                      , role       :: Role
-                      , password   :: pass }
+                      , email :: Email
+                      , username :: Username
+                      , role :: Role
+                      , password :: pass }
          deriving (Show, Generic)

-data Role = UserRole | AdminRole deriving (Show, Read, Enum, Bounded, Typeable, Generic, Eq)
+data Role = UserRole | AdminRole deriving (Show, Read, Enum, Bounded, Typeable, Generic)

 instance ToJSON Role
 instance FromJSON Role
@ -107,18 +98,18 @@ users = genTable "users" [ (email :: User HashedPassword -> Email) :- uniqueGen
 -- | Book type
 newtype HashDigest = HashDigest { unHex :: ByteString } deriving Show
 -- XXX: Add an identifier for the book
-data Book = Book { identifier  :: BookID
+data Book = Book { identifier :: BookID
                 , contentHash :: Maybe HashDigest
                 , contentType :: Text
-                 , title       :: Text
+                 , title :: Maybe Text
                 , description :: Maybe Text
-                 , owner       :: UserID }
+                 , owner :: UserID }
          deriving (Show, Generic)

 instance SqlType HashDigest where
  mkLit = LCustom . LBlob . unHex
  fromSql (SqlBlob x) = HashDigest x
-  fromSql _           = error "fromSql: Not a valid hash digest"
+  fromSql _ = error "fromSql: Not a valid hash digest"
  defaultValue = mkLit (HashDigest "") -- Doesn't really make sense

 books :: GenTable Book
@ -129,26 +120,13 @@ books = genTable "books" [ (identifier :: Book -> BookID) :- autoPrimaryGen

 -- | Categorizing books
 data Tag = Tag { identifier :: TagID
-               , tag        :: Text
-               , owner      :: UserID }
+               , tag :: Text
+               , owner :: UserID }
         deriving (Show, Generic)

-data Visibility = Public | Private | Followers
-                deriving (Show, Read, Generic, Eq)
-
-instance ToJSON Visibility
-instance FromJSON Visibility
-
-instance SqlType Visibility where
-  mkLit = LCustom . LText . pack . show
-  fromSql (SqlString x) = fromMaybe (error "fromSql: Not a valid visibility token") . readMay . unpack $ x
-  fromSql _             = error "fromSql: Not a valid visibility token"
-  defaultValue = mkLit Private
-
 data Channel = Channel { identifier :: ChannelID
-                       , channel    :: Text
-                       , owner      :: UserID
-                       , visibility :: Visibility }
+                       , channel :: Text
+                       , owner :: UserID }
             deriving (Show, Generic)

 tags :: GenTable Tag
@ -163,12 +141,12 @@ channels = genTable "channels" [ (identifier :: Channel -> ChannelID) :- autoPri
  where
    i :*: _ = selectors (gen users)

-data BookTag = BookTag { tag  :: TagID
+data BookTag = BookTag { tag :: TagID
                       , book :: BookID }
             deriving (Show, Generic)

 data BookChannel = BookChannel { channel :: ChannelID
-                               , book    :: BookID }
+                               , book :: BookID }
                 deriving (Show, Generic)

 bookTags :: GenTable BookTag
--- a/backend/src/Database/User.hs
+++ b/backend/src/Database/User.hs
@ -5,21 +5,20 @@
 module Database.User where

 import ClassyPrelude
-import Control.Lens (view, over, _Just)
-import Control.Monad (mfilter)
-import Control.Monad.Catch (MonadMask)
-import Control.Monad.Logger
-import Crypto.KDF.BCrypt
-import Crypto.Random.Types (MonadRandom)
-import Data.Generics.Product
 import Database
 import Database.Schema
 import Database.Selda
+import Control.Lens (view, over, _Just)
+import Data.Generics.Product
+import Crypto.KDF.BCrypt
+import Crypto.Random.Types (MonadRandom)
+import Control.Monad.Logger
+import Control.Monad (mfilter)

 data UserExistsError = UserExistsError


-insertUser :: (MonadMask m, MonadLogger m, MonadIO m, MonadRandom m) => Username -> Email -> PlainPassword -> SeldaT m (Either UserExistsError (User NoPassword))
+insertUser :: (MonadLogger m, MonadIO m, MonadMask m, MonadRandom m) => Username -> Email -> PlainPassword -> SeldaT m (Either UserExistsError (User NoPassword))
 insertUser username email (PlainPassword password) =
  getUser' username >>= maybe insert' (const (return $ Left UserExistsError))
  where
--- a/backend/src/Datastore.hs
+++ b/backend/src/Datastore.hs
@ -5,7 +5,6 @@
 {-# Language FlexibleContexts #-}
 {-# Language TypeSynonymInstances #-}
 {-# Language FlexibleInstances #-}
-{-# Language ScopedTypeVariables #-}
 module Datastore where

 import ClassyPrelude
@ -29,26 +28,26 @@ instance MonadDS AppM where
  get = getLocal

 putLocal :: ( MonadIO m
-            , HasField "config" r r config config
-            , HasField "store" config config store store
-            , HasType Text store
+            , HasField' "config" r config
+            , HasField' "store" config store
+            , HasField' "path" store Text
            , MonadReader r m)
            => ByteString -> m (Digest SHA256)
 putLocal bs = do
-  store :: FilePath <- unpack <$> view (field @"config" . field @"store" . typed @Text)
+  store <- unpack <$> view (field @"config" . field @"store" . field @"path")
  liftIO $ createDirectoryIfMissing True store
  let key = hashWith SHA256 bs
  writeFile (store </> show key) bs
  return key

 getLocal :: ( MonadIO m
-            , HasField "config" r r config config
-            , HasField "store" config config store store
-            , HasType Text store
+            , HasField' "config" r config
+            , HasField' "store" config store
+            , HasField' "path" store Text
            , MonadReader r m)
            => Digest SHA256 -> m (Maybe ByteString)
 getLocal key = do
-  store <- unpack <$> view (field @"config" . field @"store" . typed @Text)
+  store <- unpack <$> view (field @"config" . field @"store" . field @"path")
  liftIO $ createDirectoryIfMissing True store
  let file = store </> show key
  exists <- liftIO $ doesFileExist file
--- a/backend/src/Devel/Main.hs
+++ b/backend/src/Devel/Main.hs
@ -3,18 +3,19 @@
 {-# Language FlexibleContexts #-}
 module Devel.Main where

+import Prelude
+import Control.Monad.Trans.Reader (runReaderT)
+import Main (withApp, defaultMain)
 import Control.Concurrent
 import Control.Monad (void)
-import Control.Monad.Trans.Reader (runReaderT)
 import Data.IORef (IORef, newIORef, readIORef, writeIORef)
-import Database
-import Database.Schema
-import Database.Selda (tryCreateTable)
-import Dhall (input, auto)
 import Foreign.Store (Store(..), lookupStore, readStore, storeAction, withStore)
 import GHC.Word (Word32)
-import Main (withApp, defaultMain)
-import Prelude
+import Dhall (input, auto)
+
+import Database.Schema
+import Database.Selda (tryCreateTable)
+import Database

 update :: IO ()
 update = do
@ -36,7 +37,7 @@ update = do

 develMain :: IO ()
 develMain = do
-  conf <- input auto "../config/devel.dhall"
+  conf <- input auto "./config/devel.dhall"
  withApp conf $ \app -> do
    void $ runReaderT (runDB migrate) app
    defaultMain app
--- a/backend/src/Main.hs
+++ b/backend/src/Main.hs
@ -25,7 +25,6 @@ withApp :: Config -> (App -> IO ()) -> IO ()
 withApp config f = do
  let pgHost = view (field @"database" . field @"host") config
      pgPort = 5432
-      pgSchema = Nothing
      pgDatabase = view (field @"database" . field @"database") config
      pgUsername = Just (view (field @"database" . field @"username") config)
      pgPassword = Just (view (field @"database" . field @"password") config)
--- a/backend/src/Servant/XML.hs
+++ b/backend/src/Servant/XML.hs
--- a/src/Server.hs
+++ b/src/Server.hs
@ -0,0 +1,40 @@
+{-# Language DataKinds #-}
+{-# Language TypeFamilies #-}
+{-# Language TypeOperators #-}
+{-# Language NoImplicitPrelude #-}
+{-# Language MultiParamTypeClasses #-}
+{-# Language OverloadedStrings #-}
+{-# Language TemplateHaskell #-}
+{-# Language QuasiQuotes #-}
+{-# Language RecordWildCards #-}
+{-# Language DeriveGeneric #-}
+{-# Language FlexibleInstances #-}
+{-# Language TypeApplications #-}
+module Server where
+
+import qualified API as API
+import Server.Auth (authCheck)
+import Servant
+import Types
+import ClassyPrelude hiding (Handler)
+import Control.Monad.Logger
+import Control.Monad.Except
+import Servant.Auth.Server as SAS
+import Control.Lens
+import Data.Generics.Product
+
+type API = API.API :<|> "static" :> Raw
+
+
+server :: App -> Application
+server app = serveWithContext api cfg (enter server' API.handler :<|> serveDirectoryFileServer "static")
+  where
+    myKey = view (field @"jwk") app
+    jwtCfg = defaultJWTSettings myKey
+    authCfg = authCheck app
+    cookieSettings = SAS.defaultCookieSettings{cookieIsSecure=SAS.NotSecure}
+    cfg = jwtCfg :. cookieSettings :. authCfg :. EmptyContext
+    server' :: AppM :~> Servant.Handler
+    server' = NT (Handler . ExceptT . try . (`runReaderT` app) . (runFileLoggingT "logs/server.log"))
+    api :: Proxy API
+    api = Proxy
--- a/backend/src/Server/Auth.hs
+++ b/backend/src/Server/Auth.hs
@ -1,11 +1,11 @@
-{-# LANGUAGE DataKinds             #-}
-{-# LANGUAGE DuplicateRecordFields #-}
-{-# LANGUAGE NoImplicitPrelude     #-}
-{-# LANGUAGE OverloadedStrings     #-}
-{-# LANGUAGE TemplateHaskell       #-}
-{-# LANGUAGE TypeApplications      #-}
-{-# LANGUAGE TypeFamilies          #-}
-{-# LANGUAGE TypeOperators         #-}
+{-# Language DataKinds #-}
+{-# Language TypeFamilies #-}
+{-# Language OverloadedStrings #-}
+{-# Language NoImplicitPrelude #-}
+{-# Language TypeOperators #-}
+{-# Language DuplicateRecordFields #-}
+{-# Language TypeApplications #-}
+{-# Language TemplateHaskell #-}
 module Server.Auth
  ( SafeUser(..)
  , authCheck
@ -13,33 +13,28 @@ module Server.Auth
  , requireLoggedIn)
  where

-import           ClassyPrelude
-import           Control.Lens          (view)
-import           Control.Monad.Catch   (MonadThrow, throwM)
-import           Control.Monad.Logger
-import           Data.Aeson
-import           Data.Generics.Product
-import           Database
-import           Database.Schema
-import           Database.User
-import           Servant               (err401)
-import           Servant.Auth.Server   as SAS
-import qualified Servant.Docs          as Docs
-import           Types
+import ClassyPrelude
+import Servant.Auth.Server as SAS
+import Data.Aeson
+import Database.Schema
+import Database.User
+import Database
+import Types
+import Control.Lens (view)
+import Data.Generics.Product
+import Servant (err401)
+import Control.Monad.Logger

 -- generic-lens can convert similar types to this
 -- I'm trying out servant-auth-server which uses a jwt style login. IIRC anyone
 -- can open the jwt token and view what's inside, you just can't modify it.
 --
 -- Is it a problem that a human readable username and email are visible?
-data SafeUser = SafeUser { email    :: Email
+data SafeUser = SafeUser { email :: Email
                         , username :: Username
-                         , role     :: Role }
+                         , role :: Role }
              deriving (Show, Generic)

-instance Docs.ToSample SafeUser where
-  toSamples _ = [("User", SafeUser "user@example.com" "user" UserRole )]
-
 instance ToJSON SafeUser where
 instance FromJSON SafeUser where
 instance ToJWT SafeUser where
@ -58,6 +53,6 @@ authCheck app (BasicAuthData username password) = flip runReaderT app $
    password' = PlainPassword $ decodeUtf8 password
    authenticated = SAS.Authenticated . view (super @SafeUser)

-requireLoggedIn :: (MonadThrow m, MonadLogger m, Monad m) => (SafeUser -> m a) -> AuthResult SafeUser -> m a
+requireLoggedIn :: (MonadLogger m, MonadThrow m, Monad m) => (SafeUser -> m a) -> AuthResult SafeUser -> m a
 requireLoggedIn f (Authenticated user) = f user
 requireLoggedIn _ u = $logError (pack (show u)) >> throwM err401
--- a/backend/src/Types.hs
+++ b/backend/src/Types.hs
--- a/backend/src/View.hs
+++ b/backend/src/View.hs
				`@ -1 +0,0 @@`
				`alter table channels add column visibility text NOT NULL default 'Private';`
				`@ -1 +0,0 @@`
				`create unique index tag_owner on tags (tag, owner);`