{- This file is part of Vervis.
 -
 - Written in 2016 by fr33domlover <fr33domlover@riseup.net>.
 -
 - ♡ Copying is an act of love. Please copy, reuse and share.
 -
 - The author(s) have dedicated all copyright and related and neighboring
 - rights to this software to the public domain worldwide. This software is
 - distributed without any warranty.
 -
 - You should have received a copy of the CC0 Public Domain Dedication along
 - with this software. If not, see
 - <http://creativecommons.org/publicdomain/zero/1.0/>.
 -}

module Vervis.Handler.Git
    ( getGitRefDiscoverR
    )
where

import Prelude

import Control.Monad.IO.Class (liftIO)
import Data.Git.Storage (isRepo, withRepo)
import Data.String (fromString)
import Data.Text (Text)
import Network.Git.Fetch.RefDiscovery
import Yesod.Core.Handler

import Vervis.Content (GitRefDiscovery (..))
import Vervis.Foundation (Handler)
import Vervis.Path (askRepoDir)

getGitRefDiscoverR :: Text -> Text -> Handler GitRefDiscovery
getGitRefDiscoverR sharer repo = do
    path <- askRepoDir sharer repo
    let pathG = fromString path
    seemsThere <- liftIO $ isRepo pathG
    if seemsThere
        then do
            rq <- getRequest
            case reqGetParams rq of
                [("service", serv)] ->
                    if serv == "git-upload-pack"
                        then do
                            rd <- liftIO $ withRepo pathG $
                                flip buildRefDiscover' $ Just "git-upload-pack"
                            setHeader "Cache-Control" "no-cache"
                            return GitRefDiscovery
                                { grdContent = serializeRefDiscover rd
                                , grdService = "git-upload-pack"
                                }
                        else permissionDenied "Service not supported"
                _ -> notFound
        else notFound