Add event type handling

src/handlers/messages.ts

@@ -102,11 +102,6 @@ export async function handle(rcMessage: RcMessage): Promise<void> {
     return
   }
 
-  if (rcMessage.t) {
-    log.warn(`Message ${rcMessage._id} is of type ${rcMessage.t}, skipping.`)
-    return
-  }
-
   const room_id = await getRoomId(rcMessage.rid)
   if (!room_id) {
     log.warn(
@@ -115,6 +110,71 @@ export async function handle(rcMessage: RcMessage): Promise<void> {
     return
   }
 
+  if (rcMessage.t) {
+    switch (rcMessage.t) {
+      case 'ru': // User removed by
+      case 'ul': // User left
+      case 'ult': // User left team
+      case 'removed-user-from-team': // Removed user from team
+        log.info(
+          `Message ${rcMessage._id} is of type ${rcMessage.t}, removing member ${rcMessage.msg} from room ${room_id}`
+        )
+
+        const members = (
+          await axios.get(
+            `/_matrix/client/v3/rooms/${room_id}/joined_members`,
+            formatUserSessionOptions(applicationServiceToken)
+          )
+        ).data.joined
+        if (!members) {
+          const errorMessage = `Could not determine members of room ${room_id}, aborting`
+          log.error(errorMessage)
+          throw new Error(errorMessage)
+        }
+
+        const matrixUser =
+          Object.keys(members).find((key) =>
+            key.includes(rcMessage.msg.toLowerCase())
+          ) || ''
+
+        const userMapping = await getMappingByMatrixId(matrixUser)
+        if (!userMapping?.accessToken) {
+          log.warn(
+            `Could not get access token for ${rcMessage.msg}, maybe user is not a member, skipping.`
+          )
+          return
+        }
+
+        log.http(`User ${matrixUser} leaves room ${room_id}`)
+        await axios.post(
+          `/_matrix/client/v3/rooms/${room_id}/leave`,
+          { reason: `Event type ${rcMessage.t}` },
+          formatUserSessionOptions(userMapping.accessToken)
+        )
+        return
+
+      case 'uj': // User joined channel
+      case 'ujt': // User joined team
+      case 'ut': // User joined conversation
+
+      case 'au': // User added by
+      case 'added-user-to-team': // Added user to team
+      case 'r': // Room name changed
+      case 'rm': // Message removed
+        log.info(
+          `Message ${rcMessage._id} is of type ${rcMessage.t}, for which Rocket.Chat does not provide the initial state information, skipping.`
+        )
+        return
+
+      case 'user-muted': // User muted by
+      default:
+        log.warn(
+          `Message ${rcMessage._id} is of unhandled type ${rcMessage.t}, skipping.`
+        )
+        return
+    }
+  }
+
   const user_id = await getUserId(rcMessage.u._id)
   if (!user_id) {
     log.warn(