vervis/src/Vervis/Handler/Repo.hs

{- This file is part of Vervis.
 -
 - Written in 2016, 2018, 2019, 2020, 2022
 - 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.Repo
    ( getRepoR
    , getRepoInboxR
    , postRepoInboxR
    , getRepoOutboxR
    , getRepoOutboxItemR
    , getRepoFollowersR

    , getDarcsDownloadR
    , getGitRefDiscoverR
    , postGitUploadRequestR

    , getRepoSourceR
    , getRepoBranchSourceR
    , getRepoCommitsR
    , getRepoBranchCommitsR
    , getRepoCommitR

    , getRepoNewR
    , postRepoNewR
    , postRepoDeleteR
    , getRepoEditR
    , postRepoEditR
    , postRepoFollowR
    , postRepoUnfollowR

    , postPostReceiveR






    {-
    , getReposR
    , putRepoR
    , postRepoR
    , getRepoBranchR
    , getRepoDevsR
    , postRepoDevsR
    , getRepoDevNewR
    , getRepoDevR
    , deleteRepoDevR
    , postRepoDevR
    , getRepoTeamR

    , getHighlightStyleR
    -}
    )
where

import Control.Exception hiding (Handler)
import Control.Monad
import Control.Monad.IO.Class (liftIO)
import Control.Monad.Logger (logWarn)
import Control.Monad.Trans.Except
import Data.Bifunctor
import Data.Binary.Put
import Data.ByteString (ByteString)
import Data.Foldable
import Data.Git.Graph
import Data.Git.Harder
import Data.Git.Harder.Pack
import Data.Git.Named (RefName (..))
import Data.Git.Ref (toHex)
import Data.Git.Repository
import Data.Git.Storage (withRepo)
import Data.Git.Storage.Object (Object (..))
import Data.Git.Types (Blob (..), Person (..), entName)
import Data.Graph.Inductive.Graph (noNodes)
import Data.Graph.Inductive.Query.Topsort
import Data.List (inits)
import Data.Maybe
import Data.String
import Data.Text (Text, unpack)
import Data.Text.Encoding
import Data.Text.Encoding.Error (lenientDecode)
import Data.Time.Clock
import Data.Traversable (for)
import Database.Persist
import Database.Persist.Sql
import Data.Hourglass (timeConvert)
import Formatting (sformat, stext, (%))
import Network.Git.Transport.HTTP.Fetch.RefDiscovery
import Network.Git.Transport.HTTP.Fetch.UploadRequest
import Network.Git.Types
import Network.Wai (strictRequestBody)
import System.Directory
import System.FilePath
import System.Hourglass (dateCurrent)
import System.IO
import System.Process
import Text.Blaze.Html (Html)
import Text.Pandoc.Highlighting
import Yesod.Auth
import Yesod.Core hiding (joinPath)
import Yesod.Core.Content
import Yesod.Core.Handler (lookupPostParam, redirect, notFound)
import Yesod.Form.Functions (runFormPost)
import Yesod.Form.Types (FormResult (..))
import Yesod.Persist.Core

import qualified Data.ByteString as B
import qualified Data.ByteString.Lazy as BL
import qualified Data.ByteString.Lazy.Internal as BLI
import qualified Data.CaseInsensitive as CI (foldedCase)
import qualified Data.DList as D
import qualified Data.Set as S (member)
import qualified Data.Text as T
import qualified Data.Text.Lazy.Encoding as L (decodeUtf8With)
import qualified Database.Esqueleto as E

import Data.MediaType
import Database.Persist.JSON
import Development.PatchMediaType
import Network.FedURI
import Yesod.ActivityPub
import Yesod.FedURI
import Yesod.Hashids
import Yesod.MonadSite
import Yesod.RenderSource

import qualified Web.ActivityPub as AP

import Data.ByteString.Char8.Local (takeLine)
import Data.Either.Local
import Data.Git.Local
import Database.Persist.Local
import Text.FilePath.Local (breakExt)
import Yesod.Form.Local
import Yesod.Persist.Local

import qualified Data.Git.Local as G (createRepo)
import qualified Darcs.Local.Repository as D (createRepo)

import Vervis.Access
import Vervis.API
import Vervis.Federation.Auth
import Vervis.Federation.Collab
import Vervis.FedURI
import Vervis.Form.Repo
import Vervis.Foundation
import Vervis.Path
import Vervis.Model
import Vervis.Model.Ident
import Vervis.Paginate
import Vervis.Readme
import Vervis.Recipient
import Vervis.Settings
import Vervis.SourceTree
import Vervis.Style
import Vervis.Web.Actor
import Vervis.Web.Darcs
import Vervis.Web.Git

import qualified Vervis.Client as C
import qualified Vervis.Formatting as F
import qualified Vervis.Hook as H

getRepoR :: KeyHashid Repo -> Handler TypedContent
getRepoR repoHash = do
    repoID <- decodeKeyHashid404 repoHash
    (repo, actor) <- runDB $ do
        r <- get404 repoID
        (r,) <$> getJust (repoActor r)

    encodeRouteLocal <- getEncodeRouteLocal
    let repoAP = AP.Repo
            { AP.repoActor = AP.Actor
                { AP.actorLocal = AP.ActorLocal
                    { AP.actorId         = encodeRouteLocal $ RepoR repoHash
                    , AP.actorInbox      = encodeRouteLocal $ RepoInboxR repoHash
                    , AP.actorOutbox     =
                        Just $ encodeRouteLocal $ RepoOutboxR repoHash
                    , AP.actorFollowers  =
                        Just $ encodeRouteLocal $ RepoFollowersR repoHash
                    , AP.actorFollowing  = Nothing
                    , AP.actorPublicKeys =
                        [ Left $ encodeRouteLocal ActorKey1R
                        , Left $ encodeRouteLocal ActorKey2R
                        ]
                    , AP.actorSshKeys    = []
                    }
                , AP.actorDetail = AP.ActorDetail
                    { AP.actorType       = AP.ActorTypeRepo
                    , AP.actorUsername   = Nothing
                    , AP.actorName       = Just $ actorName actor
                    , AP.actorSummary    = Just $ actorDesc actor
                    }
                }
            , AP.repoTeam = Nothing
            , AP.repoVcs  = repoVcs repo
            }

        next =
            case repoVcs repo of
                VCSDarcs -> RepoSourceR repoHash
                VCSGit -> RepoBranchSourceR repoHash $ repoMainBranch repo
    provideHtmlAndAP repoAP $ redirect $ next []

getRepoInboxR :: KeyHashid Repo -> Handler TypedContent
getRepoInboxR = getInbox RepoInboxR repoActor

postRepoInboxR :: KeyHashid Repo -> Handler ()
postRepoInboxR recipRepoHash =
    postInbox $ handleRobotInbox (LocalActorRepo recipRepoHash) handle
    where
    handle
        :: UTCTime
        -> RemoteAuthor
        -> ActivityBody
        -> Maybe (RecipientRoutes, ByteString)
        -> LocalURI
        -> AP.SpecificActivity URIMode
        -> ExceptT Text Handler (Text, Maybe (ExceptT Text Worker Text))
    handle now author body mfwd luActivity specific =
        case specific of
            AP.AcceptActivity accept ->
                repoAcceptF now recipRepoHash author body mfwd luActivity accept
            {-
            ApplyActivity (AP.Apply uObject uTarget) ->
                repoApplyF now shrRecip rpRecip remoteAuthor body mfwd luActivity uObject uTarget
            AddActivity (AP.Add obj target) ->
                case obj of
                    Right (AddBundle patches) ->
                        repoAddBundleF now shrRecip rpRecip remoteAuthor body mfwd luActivity patches target
                    _ -> return ("Unsupported add object type for repos", Nothing)
            CreateActivity (Create obj mtarget) ->
                case obj of
                    CreateNote _ note ->
                        (,Nothing) <$> repoCreateNoteF now shrRecip rpRecip remoteAuthor body mfwd luActivity note
                    CreateTicket _ ticket ->
                        (,Nothing) <$> repoCreateTicketF now shrRecip rpRecip remoteAuthor body mfwd luActivity ticket mtarget
                    _ -> error "Unsupported create object type for repos"
            FollowActivity follow ->
                (,Nothing) <$> repoFollowF shrRecip rpRecip now remoteAuthor body mfwd luActivity follow
            -}
            AP.InviteActivity invite ->
                topicInviteF now (GrantResourceRepo recipRepoHash) author body mfwd luActivity invite
            {-
            OfferActivity (Offer obj target) ->
                case obj of
                    OfferTicket ticket ->
                        (,Nothing) <$> repoOfferTicketF now shrRecip rpRecip remoteAuthor body mfwd luActivity ticket target
                    OfferDep dep ->
                        repoOfferDepF now shrRecip rpRecip remoteAuthor body mfwd luActivity dep target
                    _ -> return ("Unsupported offer object type for repos", Nothing)
            ResolveActivity resolve ->
                (,Nothing) <$> repoResolveF now shrRecip rpRecip remoteAuthor body mfwd luActivity resolve
            UndoActivity undo->
                (,Nothing) <$> repoUndoF shrRecip rpRecip now remoteAuthor body mfwd luActivity undo
            -}
            _ -> return ("Unsupported activity type for repos", Nothing)

getRepoOutboxR :: KeyHashid Repo -> Handler TypedContent
getRepoOutboxR = getOutbox RepoOutboxR repoActor

getRepoOutboxItemR
    :: KeyHashid Repo -> KeyHashid OutboxItem -> Handler TypedContent
getRepoOutboxItemR = getOutboxItem RepoOutboxItemR repoActor

getRepoFollowersR :: KeyHashid Repo -> Handler TypedContent
getRepoFollowersR = getActorFollowersCollection RepoFollowersR repoActor

getDarcsDownloadR :: KeyHashid Repo -> [Text] -> Handler TypedContent
getDarcsDownloadR repoHash dir = do
    repoPath <- askRepoDir repoHash
    let filePath = repoPath </> "_darcs" </> joinPath (map T.unpack dir)
    exists <- liftIO $ doesFileExist filePath
    if exists
        then sendFile typeOctet filePath
        else notFound

getGitRefDiscoverR :: KeyHashid Repo -> Handler TypedContent
getGitRefDiscoverR repoHash = do
    let typ = "application/x-git-upload-pack-advertisement"
    path <- askRepoDir repoHash
    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
                            let settings =
                                    ( proc "git"
                                        [ "upload-pack"
                                        , "--stateless-rpc"
                                        , "--advertise-refs"
                                        , path
                                        ]
                                    )
                                    { std_out = CreatePipe
                                    }
                            (_, mh, _, _) <-
                                liftIO $ createProcess settings
                            let h = fromJust mh
                            refs <- liftIO $ B.hGetContents h
                            let content = runPut $ do
                                    putService UploadPack
                                    putByteString refs
                            setHeader "Cache-Control" "no-cache"
                            return $ TypedContent typ $ toContent content
                        else permissionDenied "Service not supported"
                _ -> notFound
        else notFound

postGitUploadRequestR :: KeyHashid Repo -> Handler TypedContent
postGitUploadRequestR repoHash = do
    let typ = "application/x-git-upload-pack-result"
    path <- askRepoDir repoHash
    let pathG = fromString path
    seemsThere <- liftIO $ isRepo pathG
    if seemsThere
        then do
            getBody <- strictRequestBody <$> waiRequest
            body <- liftIO getBody
            let settings =
                    ( proc "git"
                        [ "upload-pack"
                        , "--stateless-rpc"
                        , path
                        ]
                    )
                    { std_in  = CreatePipe
                    , std_out = CreatePipe
                    }
            (mhin, mhout, _, _) <- liftIO $ createProcess settings
            let hin = fromJust mhin
                hout = fromJust mhout
            liftIO $ BL.hPut hin body >> hClose hin
            setHeader "Cache-Control" "no-cache"
            let loop = do
                    b <- liftIO $ B.hGet hout BLI.defaultChunkSize
                    unless (B.null b) $ do
                        sendChunkBS b
                        loop
            respondSource typ loop
        else notFound

getRepoSourceR :: KeyHashid Repo -> [Text] -> Handler Html
getRepoSourceR repoHash path = do
    repoID <- decodeKeyHashid404 repoHash
    repo <- runDB $ get404 repoID
    case repoVcs repo of
        VCSDarcs -> error "Temporarily disabled"
            --getDarcsRepoSource repo repoHash path
        VCSGit -> notFound

getRepoBranchSourceR :: KeyHashid Repo -> Text -> [Text] -> Handler Html
getRepoBranchSourceR repoHash branch path = do
    repoID <- decodeKeyHashid404 repoHash
    repo <- runDB $ get404 repoID
    case repoVcs repo of
        VCSDarcs -> notFound
        VCSGit -> error "Temporarily disabled"
            --getGitRepoSource repo repoHash branch dir

getRepoCommitsR :: KeyHashid Repo -> Handler TypedContent
getRepoCommitsR repoHash = do
    repoID <- decodeKeyHashid404 repoHash
    repo <- runDB $ get404 repoID
    case repoVcs repo of
        VCSDarcs ->
            error "Temporarily disabled"
            --getDarcsRepoHeadChanges repoHash
        VCSGit ->
            error "Temporarily disabled"
            --getGitRepoHeadChanges repo repoHash

getRepoBranchCommitsR :: KeyHashid Repo -> Text -> Handler TypedContent
getRepoBranchCommitsR repoHash branch = do
    repoID <- decodeKeyHashid404 repoHash
    repo <- runDB $ get404 repoID
    case repoVcs repo of
        VCSDarcs ->
            error "Temporarily disabled"
            --getDarcsRepoChanges repoHash branch
        VCSGit ->
            error "Temporarily disabled"
            --getGitRepoChanges repoHash branch

getRepoCommitR :: KeyHashid Repo -> Text -> Handler TypedContent
getRepoCommitR repoHash ref = do
    repoID <- decodeKeyHashid404 repoHash
    repo <- runDB $ get404 repoID
    case repoVcs repo of
        VCSDarcs -> getDarcsPatch repoHash ref
        VCSGit -> getGitPatch repoHash ref

getRepoNewR :: Handler Html
getRepoNewR = do
    ((_result, widget), enctype) <- runFormPost newRepoForm
    defaultLayout $(widgetFile "repo/new")

postRepoNewR :: Handler Html
postRepoNewR = do
    (NewRepo name desc vcs, _widget, _enctype) <-
        runFormPostRedirect RepoNewR newRepoForm

    personEntity@(Entity personID person) <- requireAuth
    personHash <- encodeKeyHashid personID
    (maybeSummary, audience, detail) <- C.createRepo personHash name desc
    actor <- runDB $ getJust $ personActor person
    result <-
        runExceptT $ createRepositoryC personEntity actor maybeSummary audience detail vcs Nothing Nothing

    case result of
        Left e -> do
            setMessage $ toHtml e
            redirect RepoNewR
        Right createID -> do
            maybeRepoID <- runDB $ getKeyBy $ UniqueRepoCreate createID
            case maybeRepoID of
                Nothing -> error "Can't find the newly created repo"
                Just repoID -> do
                    repoHash <- encodeKeyHashid repoID
                    setMessage "New repository created"
                    redirect $ RepoR repoHash

postRepoDeleteR :: KeyHashid Repo -> Handler Html
postRepoDeleteR repoHash = do
    error "Temporarily disabled"
    {-
    runDB $ do
        Entity sid _s <- getBy404 $ UniqueSharer shar
        Entity rid _r <- getBy404 $ UniqueRepo repo sid
        delete rid
    path <- askRepoDir shar repo
    exists <- liftIO $ doesDirectoryExist path
    if exists
        then liftIO $ removeDirectoryRecursive path
        else
            $logWarn $ sformat
                ( "Deleted repo " % F.sharer % "/" % F.repo
                % " from DB but repo dir doesn't exist"
                )
                shar repo
    setMessage "Repo deleted."
    redirect HomeR
    -}

getRepoEditR :: KeyHashid Repo -> Handler Html
getRepoEditR repoHash = do
    error "Temporarily disabled"
    {-
    (sid, er) <- runDB $ do
        Entity sid _ <- getBy404 $ UniqueSharer shr
        er <- getBy404 $ UniqueRepo rp sid
        return (sid, er)
    ((_result, widget), enctype) <- runFormPost $ editRepoForm sid er
    defaultLayout $(widgetFile "repo/edit")
    -}

postRepoEditR :: KeyHashid Repo -> Handler Html
postRepoEditR repoHash = do
    error "Temporarily disabled"
    {-
    mer <- runDB $ do
        Entity sid _ <- getBy404 $ UniqueSharer shr
        er@(Entity rid r) <- getBy404 $ UniqueRepo rp sid
        mwiki <- for (repoProject r) $ \ jid -> do
            project <- getJust jid
            return $ (== rid) <$> projectWiki project
        return $ case mwiki of
            Just (Just True) -> Nothing
            _                -> Just (sid, er)
    case mer of
        Nothing -> do
            setMessage "Repo used as a wiki, can't move between projects."
            redirect $ RepoR shr rp
        Just (sid, er@(Entity rid _)) -> do
            ((result, widget), enctype) <- runFormPost $ editRepoForm sid er
            case result of
                FormSuccess repository' -> do
                    runDB $ replace rid repository'
                    setMessage "Repository updated."
                    redirect $ RepoR shr rp
                FormMissing -> do
                    setMessage "Field(s) missing."
                    defaultLayout $(widgetFile "repo/edit")
                FormFailure _l -> do
                    setMessage "Repository update failed, see errors below."
                    defaultLayout $(widgetFile "repo/edit")
    -}

postRepoFollowR :: KeyHashid Repo -> Handler ()
postRepoFollowR _ = error "Temporarily disabled"

postRepoUnfollowR :: KeyHashid Repo -> Handler ()
postRepoUnfollowR _ = error "Temporarily disabled"

postPostReceiveR :: Handler Text
postPostReceiveR = do
    error "Temporarily disabled"
    {-
    push <- requireCheckJsonBody
    (pushAP, shr, rp) <- push2ap push
    user <- runDB $ do
        p <- getJustEntity $ toSqlKey $ H.pushUser push
        s <- getJust $ personIdent $ entityVal p
        return (p, s)
    let shrUser = sharerIdent $ snd user
    summary <- do
        let mbranch = H.pushBranch push
            total = pushCommitsTotal pushAP
            lasts = pushCommitsLast pushAP
            rest firsts = total - length firsts - length lasts
            hashText (Hash b) = decodeUtf8 b
            commitW c =
                [hamlet|
                    <a href=@{RepoCommitR shr rp $ hashText $ commitHash c}>
                      #{commitTitle c}
                |]
        withUrlRenderer
            [hamlet|
                <p>
                  <a href=@{SharerR shrUser}>#{shr2text shrUser}
                  \ pushed #{total} #
                  \ #{commitsText mbranch total} to repo #
                  <a href=@{RepoR shr rp}>#{rp2text rp}</a>^{branchText shr rp mbranch}:
                <ul>
                  $maybe firsts <- pushCommitsFirst pushAP
                    $forall c <- firsts
                      <li>^{commitW c}
                    <li>#{rest firsts}
                  $forall c <- lasts
                    <li>^{commitW c}
            |]
    eid <- runExceptT $ pushCommitsC user summary pushAP shr rp
    case eid of
        Left e -> liftIO $ throwIO $ userError $ T.unpack e
        Right obiid -> do
            renderUrl <- askUrlRender
            obikhid <- encodeKeyHashid obiid
            return $
                "Push activity published: " <>
                renderUrl (SharerOutboxItemR shrUser obikhid)
    where
    push2ap (H.Push secret _ sharer repo mbranch mbefore after early mlate) = do
        encodeRouteLocal <- getEncodeRouteLocal
        let shr = text2shr sharer
            rp = text2rp repo
            commit2ap' = commit2ap shr rp
        (commitsLast, commitsFirst) <-
            runDB $ case mlate of
                Nothing -> (,) <$> traverse commit2ap' early <*> pure Nothing
                Just (_omitted, late) ->
                    (,) <$> traverse commit2ap' late
                        <*> (Just <$> traverse commit2ap' early)
        return
            ( Push
                { pushCommitsLast  = commitsLast
                , pushCommitsFirst = commitsFirst
                , pushCommitsTotal =
                    case mlate of
                        Nothing -> length early
                        Just (omitted, late) ->
                            length early + omitted + length late
                , pushTarget       =
                    encodeRouteLocal $
                        case mbranch of
                            Nothing -> RepoR shr rp
                            Just b -> RepoBranchR shr rp b
                , pushContext      = encodeRouteLocal $ RepoR shr rp
                , pushHashBefore   = mbefore
                , pushHashAfter    = after
                }
            , shr
            , rp
            )
        where
        commit2ap shr rp (H.Commit (wauthor, wtime) mcommitted hash title desc) = do
            encodeRouteLocal <- getEncodeRouteLocal
            encodeRouteHome <- getEncodeRouteHome
            author <- authorByEmail wauthor
            mcommitter <- traverse (authorByEmail . fst) mcommitted
            return Commit
                { commitId          = encodeRouteLocal $ RepoCommitR shr rp hash
                , commitRepository  = encodeRouteLocal $ RepoR shr rp
                , commitAuthor      = second (encodeRouteHome . SharerR) author
                , commitCommitter   =
                    second (encodeRouteHome . SharerR) <$> mcommitter
                , commitTitle       = title
                , commitHash        = Hash $ encodeUtf8 hash
                , commitDescription =
                    if T.null desc
                        then Nothing
                        else Just desc
                , commitWritten     = wtime
                , commitCommitted   = snd <$> mcommitted
                }
            where
            authorByEmail (H.Author name email) = do
                mperson <- getValBy $ UniquePersonEmail email
                case mperson of
                    Nothing -> return $ Left $ Author name email
                    Just person ->
                        Right . sharerIdent <$> getJust (personIdent person)
    commitsText :: Maybe a -> Int -> Text
    commitsText Nothing n =
        if n > 1
            then "patches"
            else "patch"
    commitsText (Just _) n =
        if n > 1
            then "commits"
            else "commit"
    --branchText :: ShrIdent -> RpIdent -> Maybe Text -> HtmlUrl (Route App)
    branchText _   _  Nothing       = const mempty
    branchText shr rp (Just branch) =
        [hamlet|
            , branch #
            <a href=@{RepoBranchR shr rp branch}>#{branch}
        |]
    -}
























{-
getReposR :: ShrIdent -> Handler Html
getReposR user = do
    repos <- runDB $ E.select $ E.from $ \ (sharer, repo) -> do
        E.where_ $
            sharer E.^. SharerIdent E.==. E.val user E.&&.
            sharer E.^. SharerId E.==. repo E.^. RepoSharer
        E.orderBy [E.asc $ repo E.^. RepoIdent]
        return $ repo E.^. RepoIdent
    defaultLayout $(widgetFile "repo/list")

selectRepo :: ShrIdent -> RpIdent -> AppDB (Maybe (Sharer, Project, Workflow, Sharer), Repo)
selectRepo shar repo = do
    Entity sid _s <- getBy404 $ UniqueSharer shar
    Entity _rid r <- getBy404 $ UniqueRepo repo sid
    mj <- for (repoProject r) $ \ jid -> do
        j <- get404 jid
        s <- get404 $ projectSharer j
        w <- get404 $ projectWorkflow j
        sw <- get404 $ workflowSharer w
        return (s, j, w, sw)
    return (mj, r)

getRepoBranchR :: ShrIdent -> RpIdent -> Text -> Handler TypedContent
getRepoBranchR shar repo ref = do
    (_, repository) <- runDB $ selectRepo shar repo
    case repoVcs repository of
        VCSDarcs -> notFound
        VCSGit -> getGitRepoBranch shar repo ref

getRepoDevsR :: ShrIdent -> RpIdent -> Handler Html
getRepoDevsR shr rp = do
    devs <- runDB $ do
        rid <- do
            Entity s _ <- getBy404 $ UniqueSharer shr
            Entity r _ <- getBy404 $ UniqueRepo rp s
            return r
        E.select $ E.from $ \ (topic `E.InnerJoin` recip `E.InnerJoin` person `E.InnerJoin` sharer `E.LeftOuterJoin` (crole `E.InnerJoin` role)) -> do
            E.on $ crole E.?. CollabRoleLocalRole E.==. role E.?. RoleId
            E.on $ E.just (recip E.^. CollabRecipLocalCollab) E.==. crole E.?. CollabRoleLocalCollab
            E.on $ person E.^. PersonIdent E.==. sharer E.^. SharerId
            E.on $ recip E.^. CollabRecipLocalPerson E.==. person E.^. PersonId
            E.on $ topic E.^. CollabTopicLocalRepoCollab E.==. recip E.^. CollabRecipLocalCollab
            E.where_ $ topic E.^. CollabTopicLocalRepoRepo E.==. E.val rid
            return (sharer, role E.?. RoleIdent)
    defaultLayout $(widgetFile "repo/collab/list")

postRepoDevsR :: ShrIdent -> RpIdent -> Handler Html
postRepoDevsR shr rp = do
    (sid, mjid, obid, rid) <- runDB $ do
        Entity s _ <- getBy404 $ UniqueSharer shr
        Entity r repository <- getBy404 $ UniqueRepo rp s
        return (s, repoProject repository, repoOutbox repository, r)
    ((result, widget), enctype) <- runFormPost $ newRepoCollabForm sid mjid rid
    case result of
        FormSuccess nc -> do
            now <- liftIO getCurrentTime
            host <- asksSite siteInstanceHost
            runDB $ do
                obiid <-
                    insert $
                        OutboxItem
                            obid
                            (persistJSONObjectFromDoc $ Doc host emptyActivity)
                            now
                cid <- insert Collab
                for_ (ncRole nc) $ \ rlid -> insert_ $ CollabRoleLocal cid rlid
                insert_ $ CollabTopicLocalRepo cid rid
                insert_ $ CollabSenderLocal cid obiid
                insert_ $ CollabRecipLocal cid (ncPerson nc)
            setMessage "Collaborator added."
            redirect $ RepoDevsR shr rp
        FormMissing -> do
            setMessage "Field(s) missing"
            defaultLayout $(widgetFile "repo/collab/new")
        FormFailure _l -> do
            setMessage "Operation failed, see errors below"
            defaultLayout $(widgetFile "repo/collab/new")

getRepoDevNewR :: ShrIdent -> RpIdent -> Handler Html
getRepoDevNewR shr rp = do
    (sid, mjid, rid) <- runDB $ do
        Entity s _ <- getBy404 $ UniqueSharer shr
        Entity r repository <- getBy404 $ UniqueRepo rp s
        return (s, repoProject repository, r)
    ((_result, widget), enctype) <-
        runFormPost $ newRepoCollabForm sid mjid rid
    defaultLayout $(widgetFile "repo/collab/new")

getRepoDevR :: ShrIdent -> RpIdent -> ShrIdent -> Handler Html
getRepoDevR shr rp dev = do
    mrl <- runDB $ do
        rid <- do
            Entity s _ <- getBy404 $ UniqueSharer shr
            Entity r _ <- getBy404 $ UniqueRepo rp s
            return r
        pid <- do
            Entity s _ <- getBy404 $ UniqueSharer dev
            Entity p _ <- getBy404 $ UniquePersonIdent s
            return p
        l <- E.select $ E.from $ \ (topic `E.InnerJoin` recip) -> do
            E.on $ topic E.^. CollabTopicLocalRepoCollab E.==. recip E.^. CollabRecipLocalCollab
            E.where_ $
                topic E.^. CollabTopicLocalRepoRepo E.==. E.val rid E.&&.
                recip E.^. CollabRecipLocalPerson E.==. E.val pid
            return $ recip E.^. CollabRecipLocalCollab
        cid <-
            case l of
                [] -> notFound
                [E.Value cid] -> return cid
                _ -> error "Multiple collabs for repo+person"
        mcrole <- getValBy $ UniqueCollabRoleLocal cid
        for mcrole $
            \ (CollabRoleLocal _cid rlid) -> roleIdent <$> getJust rlid
    defaultLayout $(widgetFile "repo/collab/one")

deleteRepoDevR :: ShrIdent -> RpIdent -> ShrIdent -> Handler Html
deleteRepoDevR shr rp dev = do
    runDB $ do
        rid <- do
            Entity s _ <- getBy404 $ UniqueSharer shr
            Entity r _ <- getBy404 $ UniqueRepo rp s
            return r
        pid <- do
            Entity s _ <- getBy404 $ UniqueSharer dev
            Entity p _ <- getBy404 $ UniquePersonIdent s
            return p
        collabs <- E.select $ E.from $ \ (recip `E.InnerJoin` topic) -> do
            E.on $ recip E.^. CollabRecipLocalCollab E.==. topic E.^. CollabTopicLocalRepoCollab
            E.where_ $
                recip E.^. CollabRecipLocalPerson E.==. E.val pid E.&&.
                topic E.^. CollabTopicLocalRepoRepo E.==. E.val rid
            return
                ( recip E.^. CollabRecipLocalId
                , topic E.^. CollabTopicLocalRepoId
                , recip E.^. CollabRecipLocalCollab
                )
        (E.Value crid, E.Value ctid, E.Value cid) <-
            case collabs of
                [] -> notFound
                [c] -> return c
                _ -> error "More than 1 collab for repo+person"
        deleteWhere [CollabRoleLocalCollab ==. cid]
        delete ctid
        deleteWhere [CollabSenderLocalCollab ==. cid]
        deleteWhere [CollabSenderRemoteCollab ==. cid]
        delete crid
        delete cid
    setMessage "Collaborator removed."
    redirect $ RepoDevsR shr rp

postRepoDevR :: ShrIdent -> RpIdent -> ShrIdent -> Handler Html
postRepoDevR shr rp dev = do
    mmethod <- lookupPostParam "_method"
    case mmethod of
        Just "DELETE" -> deleteRepoDevR shr rp dev
        _             -> notFound

getRepoTeamR :: ShrIdent -> RpIdent -> Handler TypedContent
getRepoTeamR shr rp = do
    memberShrs <- runDB $ do
        sid <- getKeyBy404 $ UniqueSharer shr
        _rid <- getKeyBy404 $ UniqueRepo rp sid
        id_ <-
            requireEitherAlt
                (getKeyBy $ UniquePersonIdent sid)
                (getKeyBy $ UniqueGroup sid)
                "Found sharer that is neither person nor group"
                "Found sharer that is both person and group"
        case id_ of
            Left pid -> return [shr]
            Right gid -> do
                pids <-
                    map (groupMemberPerson . entityVal) <$>
                        selectList [GroupMemberGroup ==. gid] []
                sids <-
                    map (personIdent . entityVal) <$>
                        selectList [PersonId <-. pids] []
                map (sharerIdent . entityVal) <$>
                    selectList [SharerId <-. sids] []

    let here = RepoTeamR shr rp

    encodeRouteLocal <- getEncodeRouteLocal
    encodeRouteHome <- getEncodeRouteHome
    let team = Collection
            { collectionId         = encodeRouteLocal here
            , collectionType       = CollectionTypeUnordered
            , collectionTotalItems = Just $ length memberShrs
            , collectionCurrent    = Nothing
            , collectionFirst      = Nothing
            , collectionLast       = Nothing
            , collectionItems      = map (encodeRouteHome . SharerR) memberShrs
            }
    provideHtmlAndAP team $ redirectToPrettyJSON here

getRepoFollowersR :: ShrIdent -> RpIdent -> Handler TypedContent
getRepoFollowersR shr rp = getFollowersCollection here getFsid
    where
    here = RepoFollowersR shr rp
    getFsid = do
        sid <- getKeyBy404 $ UniqueSharer shr
        r <- getValBy404 $ UniqueRepo rp sid
        return $ repoFollowers r

getHighlightStyleR :: Text -> Handler TypedContent
getHighlightStyleR styleName =
    case lookup (unpack styleName) highlightingStyles of
        Nothing -> notFound
        Just style ->
            return $ TypedContent typeCss $ toContent $ styleToCss style
-}