Initial OPDS support

Channel listing (#2)

List books (#2)

Closes (#2)

ebook-manager.cabal

@@ -1,6 +1,3 @@
--- Initial ebook-manager.cabal generated by cabal init.  For further
--- documentation, see http://haskell.org/cabal/users-guide/
-
 name:                ebook-manager
 version:             0.1.0.0
 -- synopsis:

src/API.hs

@@ -27,8 +27,8 @@ data Index = Index
 
 type API = Get '[HTML] (AppView Index)
       :<|> Users.API
-      :<|> "api" :> Channels.API
+      :<|> "api" :> "current" :> Channels.API
-      :<|> "api" :> Books.API
+      :<|> "api" :> "current" :> Books.API
       :<|> "api" :> "1" :> Catalogue.VersionedAPI 1
       :<|> "api" :> "current" :> Catalogue.VersionedAPI 1
 

src/API/Books.hs

@@ -36,14 +36,14 @@ import Crypto.Hash (digestFromByteString)
 
 data JsonBook = JsonBook { identifier :: BookID
                          , contentType :: Text
-                         , title :: Maybe Text
+                         , title :: Text
                          , description :: Maybe Text
                          , channels :: [Text]
                          , tags :: [Text] }
               deriving (Generic, Show)
 
 data PostBook = PostBook { contentType :: Text
-                         , title :: Maybe Text
+                         , title :: Text
                          , description :: Maybe Text
                          , channels :: [Text]
                          , tags :: [Text] }
@@ -61,7 +61,9 @@ 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
+       :<|> GetBook
+
+type GetBook = "books" :> Capture "book_id" BookID :> Get '[OctetStream] ByteString
 
 handler :: ServerT API AppM
 handler user = listBooksHandler user

src/API/Catalogue.hs

@@ -17,14 +17,16 @@
 module API.Catalogue (VersionedAPI, handler) where
 
 import Types
-import Servant
+import Servant hiding (contentType)
 import ClassyPrelude
 import GHC.TypeLits
 import Server.Auth
 import Servant.Auth as SA
 import Servant.XML
 import qualified Database.Channel as Channel
+import Database.Book (Book(..))
 import Database
+import qualified API.Books
 
 -- 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
@@ -96,15 +98,40 @@ 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 SafeUser{username} = do
+  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 = Rel ("/api/current/" <> selfUrl)
+  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
       -- 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 = pack . uriPath . linkURI $ safeLink (Proxy @(BaseAPI 1)) (Proxy @(RootCatalog 1))
+      selfUrl = safeLink (Proxy @(BaseAPI 1)) (Proxy @(RootCatalog 1))
       start = self
       pagination = Pagination Nothing Nothing
   entries <- map (fromChannel updated) <$> runDB (Channel.userChannels username)
@@ -112,14 +139,16 @@ instance VersionedCatalog AppM 1 where
   where
     fromChannel :: UTCTime -> Channel.Channel -> Entry 1
     fromChannel updated Channel.Channel{..} =
-        let url = pack . uriPath . linkURI $ safeLink (Proxy @(BaseAPI 1)) (Proxy @(ChannelCatalog 1)) identifier
+      let url = safeLink (Proxy @(BaseAPI 1)) (Proxy @(ChannelCatalog 1)) identifier
-            self = Rel ("/api/current/" <> url)
+          self = relUrl url
       in EntryV1 channel channel updated channel (Left $ SubSection self)
 
 type VersionedAPI (v :: Nat) = Auth '[SA.BasicAuth, SA.JWT] SafeUser :> BaseAPI v
 
-type RootCatalog (v :: Nat) = "catalog" :> Get '[XML] (Catalog v)
+type CatalogContent = '[XML, OPDS]
-type ChannelCatalog (v :: Nat) = "catalog" :> "channel" :> Capture "channel_id" Channel.ChannelID :> Get '[XML] (Catalog v)
+
+type RootCatalog (v :: Nat) = "catalog" :> Get CatalogContent (Catalog v)
+type ChannelCatalog (v :: Nat) = "catalog" :> "channel" :> Capture "channel_id" Channel.ChannelID :> Get CatalogContent (Catalog v)
 type BaseAPI (v :: Nat) = RootCatalog v
                     :<|> ChannelCatalog v
 
@@ -127,6 +156,8 @@ handler :: forall v. VersionedCatalog AppM v => ServerT (VersionedAPI v) AppM
 handler auth = catalogRoot :<|> catalogChannels
   where
     catalogChannels :: Channel.ChannelID -> AppM (Catalog v)
-    catalogChannels _ = throwM err403{errBody="Not implemented"}
+    -- Channel specific catalog returns tags inside the catalog
+    catalogChannels identifier = flip requireLoggedIn auth (getBooks identifier)
     catalogRoot :: AppM (Catalog v)
+    -- catalog root returns channels
     catalogRoot = flip requireLoggedIn auth getChannels

src/Database/Book.hs

@@ -51,7 +51,7 @@ getBook identifier owner = listToMaybe . fromRels <$> query q
       return book
 
 data InsertBook = InsertBook { contentType :: Text
-                             , title :: Maybe Text
+                             , title :: Text
                              , description :: Maybe Text
                              , owner :: Username }
 
@@ -68,7 +68,7 @@ insertBook InsertBook{..} = do
 
 data UpdateBook = UpdateBook { identifier :: BookID
                              , contentType :: Text
-                             , title :: Maybe Text
+                             , title :: Text
                              , description :: Maybe Text
                              , owner :: Username
                              , tags :: [Text]

src/Database/Channel.hs

@@ -11,8 +11,9 @@ module Database.Channel
   , Visibility(..)
   , clearChannels
   , booksChannels
+  , channelBooks
   , Channel(..)
-  , ChannelID )
+  , ChannelID(..) )
   where
 
 import ClassyPrelude
@@ -80,6 +81,19 @@ insertChannel username channel visibility = runMaybeT $ do
       restrict (user .== literal username)
       return userId
 
+channelBooks :: (MonadSelda m, MonadMask m, MonadIO m) => Username -> ChannelID -> m [Book]
+channelBooks username identifier = fromRels <$> query q
+  where
+    q = do
+      channelId :*: bookId' <- select (gen bookChannels)
+      channelId' :*: _ :*: owner :*: _ <- select (gen channels)
+      userId :*: _ :*: username' :*: _ <- select (gen users)
+      book@(bookId :*: _) <- select (gen books)
+      restrict (username' .== literal username .&& owner .== userId)
+      restrict (channelId .== literal identifier .&& channelId .== channelId')
+      restrict (bookId .== bookId')
+      return book
+
 booksChannels :: (MonadSelda m, MonadMask m, MonadIO m) => BookID -> m [Channel]
 booksChannels bookId = fromRels <$> query q
   where

src/Database/Schema.hs

@@ -42,7 +42,7 @@ instance SqlType Username where
 
 newtype UserID = UserID {unUserID :: Int} deriving (Show)
 
-newtype BookID = BookID {unBookID :: Int} deriving (Show, ToJSON, FromJSON, FromHttpApiData, Eq, Ord)
+newtype BookID = BookID {unBookID :: Int} deriving (Show, ToJSON, FromJSON, FromHttpApiData, Eq, Ord, ToHttpApiData)
 
 newtype ChannelID = ChannelID {unChannelID :: Int} deriving (Show, ToHttpApiData, FromHttpApiData, ToJSON, FromJSON)
 
@@ -101,7 +101,7 @@ newtype HashDigest = HashDigest { unHex :: ByteString } deriving Show
 data Book = Book { identifier :: BookID
                  , contentHash :: Maybe HashDigest
                  , contentType :: Text
-                 , title :: Maybe Text
+                 , title :: Text
                  , description :: Maybe Text
                  , owner :: UserID }
           deriving (Show, Generic)

src/Servant/XML.hs

@@ -1,9 +1,11 @@
 {-# Language OverloadedStrings #-}
 {-# Language FlexibleInstances #-}
 {-# Language MultiParamTypeClasses #-}
+{-# Language TypeApplications #-}
 module Servant.XML
   ( ToNode(..)
   , XML
+  , OPDS
   , Text.Hamlet.XML.xml
   , iso8601 )
   where
@@ -16,14 +18,22 @@ import Network.HTTP.Media.MediaType
 
 data XML
 
+data OPDS
+
 instance (ToNode a) => MimeRender XML a where
   mimeRender _ a =
     let [NodeElement root] = toNode a
     in renderLBS def (Document (Prologue [] Nothing []) root [])
 
+instance (ToNode a) => MimeRender OPDS a where
+  mimeRender _ a = mimeRender (Proxy @XML) a
+
 instance Accept XML where
   contentType _ = "application" // "xml" /: ("charset", "utf-8")
 
+instance Accept OPDS where
+  contentType _ = "application" // "atom+xml" /: ("charset", "utf-8") /: ("profile", "opds-catalog")
+
 iso8601 :: UTCTime -> Text
 iso8601 = pack . formatTime defaultTimeLocale "%Y-%m-%dT%H:%M:%SZ"