+async function activityPubContextify <T> (data: T, type: ContextType) {
+ return { ...await getContextData(type), ...data }
+}
+
+// ---------------------------------------------------------------------------
+
+export {
+ getContextData,
+ activityPubContextify
+}
+
+// ---------------------------------------------------------------------------
+
+type ContextValue = { [ id: string ]: (string | { '@type': string, '@id': string }) }
+
+const contextStore: { [ id in ContextType ]: (string | { [ id: string ]: string })[] } = {
+ Video: buildContext({
+ Hashtag: 'as:Hashtag',
+ uuid: 'sc:identifier',
+ category: 'sc:category',
+ licence: 'sc:license',
+ subtitleLanguage: 'sc:subtitleLanguage',
+ sensitive: 'as:sensitive',
+ language: 'sc:inLanguage',
+ identifier: 'sc:identifier',
+
+ // TODO: remove in a few versions, introduced in 4.2
+ icons: 'as:icon',
+
+ isLiveBroadcast: 'sc:isLiveBroadcast',
+ liveSaveReplay: {
+ '@type': 'sc:Boolean',
+ '@id': 'pt:liveSaveReplay'
+ },
+ permanentLive: {
+ '@type': 'sc:Boolean',
+ '@id': 'pt:permanentLive'
+ },
+ latencyMode: {
+ '@type': 'sc:Number',
+ '@id': 'pt:latencyMode'
+ },
+
+ Infohash: 'pt:Infohash',
+
+ originallyPublishedAt: 'sc:datePublished',
+ views: {
+ '@type': 'sc:Number',
+ '@id': 'pt:views'
+ },
+ state: {
+ '@type': 'sc:Number',
+ '@id': 'pt:state'
+ },
+ size: {
+ '@type': 'sc:Number',
+ '@id': 'pt:size'
+ },
+ fps: {
+ '@type': 'sc:Number',
+ '@id': 'pt:fps'
+ },
+ commentsEnabled: {
+ '@type': 'sc:Boolean',
+ '@id': 'pt:commentsEnabled'
+ },
+ downloadEnabled: {
+ '@type': 'sc:Boolean',
+ '@id': 'pt:downloadEnabled'
+ },
+ waitTranscoding: {
+ '@type': 'sc:Boolean',
+ '@id': 'pt:waitTranscoding'
+ },
+ support: {
+ '@type': 'sc:Text',
+ '@id': 'pt:support'
+ },
+ likes: {
+ '@id': 'as:likes',
+ '@type': '@id'
+ },
+ dislikes: {
+ '@id': 'as:dislikes',
+ '@type': '@id'
+ },
+ shares: {
+ '@id': 'as:shares',
+ '@type': '@id'
+ },
+ comments: {
+ '@id': 'as:comments',
+ '@type': '@id'
+ }
+ }),
+
+ Playlist: buildContext({
+ Playlist: 'pt:Playlist',
+ PlaylistElement: 'pt:PlaylistElement',
+ position: {
+ '@type': 'sc:Number',
+ '@id': 'pt:position'
+ },
+ startTimestamp: {
+ '@type': 'sc:Number',
+ '@id': 'pt:startTimestamp'
+ },
+ stopTimestamp: {
+ '@type': 'sc:Number',
+ '@id': 'pt:stopTimestamp'
+ },
+ uuid: 'sc:identifier'
+ }),
+
+ CacheFile: buildContext({
+ expires: 'sc:expires',
+ CacheFile: 'pt:CacheFile'
+ }),
+
+ Flag: buildContext({
+ Hashtag: 'as:Hashtag'
+ }),
+
+ Actor: buildContext({
+ playlists: {
+ '@id': 'pt:playlists',
+ '@type': '@id'
+ },
+ support: {
+ '@type': 'sc:Text',
+ '@id': 'pt:support'
+ },
+
+ // TODO: remove in a few versions, introduced in 4.2
+ icons: 'as:icon'
+ }),
+
+ WatchAction: buildContext({
+ WatchAction: 'sc:WatchAction',
+ startTimestamp: {
+ '@type': 'sc:Number',
+ '@id': 'pt:startTimestamp'
+ },
+ stopTimestamp: {
+ '@type': 'sc:Number',
+ '@id': 'pt:stopTimestamp'
+ },
+ watchSection: {
+ '@type': 'sc:Number',
+ '@id': 'pt:stopTimestamp'
+ },
+ uuid: 'sc:identifier'
+ }),
+
+ Collection: buildContext(),
+ Follow: buildContext(),
+ Reject: buildContext(),
+ Accept: buildContext(),
+ View: buildContext(),
+ Announce: buildContext(),
+ Comment: buildContext(),
+ Delete: buildContext(),
+ Rate: buildContext()
+}
+
+async function getContextData (type: ContextType) {
+ const contextData = await Hooks.wrapObject(
+ contextStore[type],
+ 'filter:activity-pub.activity.context.build.result'
+ )
+
+ return { '@context': contextData }
+}
+
+function buildContext (contextValue?: ContextValue) {
+ const baseContext = [