114 lines
3.5 KiB
Haskell
114 lines
3.5 KiB
Haskell
{- core xmpp support
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-
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- Copyright 2012 Joey Hess <joey@kitenet.net>
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-
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- Licensed under the GNU GPL version 3 or higher.
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-}
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module Assistant.XMPP where
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import Assistant.Common
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import Annex.UUID
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import Assistant.Pairing
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import Network.Protocol.XMPP
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import qualified Data.Text as T
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import Data.XML.Types
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{- A presence with a git-annex tag in it. -}
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gitAnnexPresence :: Element -> Presence
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gitAnnexPresence tag = (emptyPresence PresenceAvailable)
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{ presencePayloads = [extendedAway, tag] }
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where
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extendedAway = Element (Name (T.pack "show") Nothing Nothing) []
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[NodeContent $ ContentText $ T.pack "xa"]
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{- Does a presence contain a git-annex tag? -}
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isGitAnnexPresence :: Presence -> Bool
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isGitAnnexPresence p = any isGitAnnexTag (presencePayloads p)
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{- Name of a git-annex tag, in our own XML namespace.
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- (Not using a namespace URL to avoid unnecessary bloat.) -}
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gitAnnexTagName :: Name
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gitAnnexTagName = Name (T.pack "git-annex") (Just $ T.pack "git-annex") Nothing
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isGitAnnexTag :: Element -> Bool
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isGitAnnexTag t = elementName t == gitAnnexTagName
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{- A git-annex tag, to let other clients know we're a git-annex client too. -}
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gitAnnexSignature :: Element
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gitAnnexSignature = Element gitAnnexTagName [] []
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queryAttr :: Name
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queryAttr = Name (T.pack "query") Nothing Nothing
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pushAttr :: Name
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pushAttr = Name (T.pack "push") Nothing Nothing
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pairingAttr :: Name
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pairingAttr = Name (T.pack "pairing") Nothing Nothing
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isAttr :: Name -> (Name, [Content]) -> Bool
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isAttr attr (k, _) = k == attr
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getAttr :: Name -> [(Name, [Content])] -> Maybe String
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getAttr wantattr attrs = content <$> headMaybe (filter (isAttr wantattr) attrs)
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where
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content (_name, cs) = T.unpack $ T.concat $ map unpack cs
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unpack (ContentText t) = t
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unpack (ContentEntity t) = t
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uuidAttr :: Name
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uuidAttr = Name (T.pack "uuid") Nothing Nothing
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uuidSep :: T.Text
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uuidSep = T.pack ","
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{- git-annex tag with one push attribute per UUID pushed to. -}
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encodePushNotification :: [UUID] -> Element
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encodePushNotification us = Element gitAnnexTagName
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[(pushAttr, [ContentText pushvalue])] []
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where
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pushvalue = T.intercalate uuidSep $
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map (T.pack . fromUUID) us
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decodePushNotification :: Element -> Maybe [UUID]
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decodePushNotification (Element name attrs _nodes)
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| name == gitAnnexTagName && not (null us) = Just us
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| otherwise = Nothing
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where
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us = map (toUUID . T.unpack) $
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concatMap (T.splitOn uuidSep . T.concat . map fromContent . snd) $
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filter ispush attrs
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ispush (k, _) = k == pushAttr
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fromContent (ContentText t) = t
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fromContent (ContentEntity t) = t
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{- A request for other git-annex clients to send presence. -}
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presenceQuery :: Presence
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presenceQuery = gitAnnexPresence $ Element gitAnnexTagName
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[ (queryAttr, [ContentText T.empty]) ]
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[]
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isPresenceQuery :: Presence -> Bool
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isPresenceQuery p = case filter isGitAnnexTag (presencePayloads p) of
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[] -> False
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((Element _name attrs _nodes):_) -> any (isAttr queryAttr) attrs
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{- A notification about a stage of pairing. -}
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pairingNotification :: PairStage -> Annex Presence
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pairingNotification pairstage = do
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u <- getUUID
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return $ gitAnnexPresence $ Element gitAnnexTagName
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[ (pairingAttr, [ContentText $ T.pack $ show pairstage])
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, (uuidAttr, [ContentText $ T.pack $ fromUUID u])
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]
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[]
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isPairingNotification :: Presence -> Maybe (PairStage, UUID)
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isPairingNotification p = case filter isGitAnnexTag (presencePayloads p) of
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[] -> Nothing
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((Element _name attrs _nodes):_) ->
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(,)
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<$> (readish =<< getAttr pairingAttr attrs)
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<*> (toUUID <$> getAttr uuidAttr attrs)
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