Override jitsi meeting url with jitsi tag (#248)

If present, used instead of roomType_roomId to generate the jitsi meeting URL. Useful if certain URLs have problems because of server issues.
fixes #247

client/imports/jitsi.coffee

@@ -5,10 +5,14 @@ import { StaticJitsiMeeting } from '/lib/imports/settings.coffee'
 
 export jitsiRoom = (roomType, roomId) ->
   return unless roomId
+  meeting = "#{roomType}_#{roomId}"
   if roomId is '0'
     return unless StaticJitsiMeeting.get()
-    return "#{canonical(share.settings.TEAM_NAME)}_#{StaticJitsiMeeting.get()}"
-  "#{canonical(share.settings.TEAM_NAME)}_#{roomType}_#{roomId}"
+    meeting = StaticJitsiMeeting.get()
+  else
+    override = share.model.collection(roomType)?.findOne(_id: roomId)?.tags?.jitsi?.value
+    meeting = override if override?
+  "#{canonical(share.settings.TEAM_NAME)}_#{meeting}"
 
 export default jitsiUrl = (roomType, roomId) ->
   return unless share.settings.JITSI_SERVER

docs/Solving.md

@@ -29,6 +29,12 @@ When you first log into the blackboard, you join the main Jitsi Meeting. (You ma
   * **By default, you enter meetings with your microphone muted and your camera disabled.**
   * To change your mute/video status within a meeting, click on the mic or video icon in that meeting.
   * To change your default mute/video status, click on the Settings Dropdown at the top of any blackboard page, and toggle the appropriate option.
+
+* It's broken!
+  * Normally the meeting URL for a puzzle is generated automatically from the randomly generated puzzle ID.
+  * Sometimes a specific meeting URL will have issues when other meetings are fine, possibly because of issues on the Jitsi server hosting that meeting.
+  * You can force a different meeting URL by (setting the `jitsi` tag)[#tags] on a puzzle.
+  * You can also use this to cause multiple puzzles to share one meeting, if that would be useful.
 
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