Make authorships show up again

It turns out our shiny new typed ES2015 `Map`s are not serializable to JSON. :(
Luckily, we only use strings as keys and can write a function that converts them to serializable objects!

Signed-off-by: David Mehren <dmehren1@gmail.com>

src/lib/realtime.ts

@@ -13,6 +13,7 @@ import { Author, Note, Revision, User } from './models'
 import { NoteAuthorship } from './models/note'
 import { PhotoProfile } from './models/user'
 import { EditorSocketIOServer } from './ot/editor-socketio-server'
+import { mapToObject } from './utils'
 
 export type SocketWithNoteId = Socket & { noteId: string }
 
@@ -77,7 +78,7 @@ function emitCheck (note: NoteSession): void {
     updatetime: note.updatetime,
     lastchangeuser: note.lastchangeuser,
     lastchangeuserprofile: note.lastchangeuserprofile,
-    authors: note.authors,
+    authors: mapToObject(note.authors),
     authorship: note.authorship
   }
   realtime.io.to(note.id).emit('check', out)
@@ -380,7 +381,7 @@ function emitRefresh (socket: SocketWithNoteId): void {
     ownerprofile: note.ownerprofile,
     lastchangeuser: note.lastchangeuser,
     lastchangeuserprofile: note.lastchangeuserprofile,
-    authors: note.authors,
+    authors: mapToObject(note.authors),
     authorship: note.authorship,
     permission: note.permission,
     createtime: note.createtime,

src/lib/utils.ts

@@ -4,6 +4,16 @@ import { logger } from './logger'
 import { Revision } from './models'
 import { realtime } from './realtime'
 
+/*
+Converts a map from string to something into a plain JS object for transmitting via a websocket
+ */
+export function mapToObject<T> (map: Map<string, T>): object {
+  return Array.from(map).reduce((obj, [key, value]) => {
+    obj[key] = value
+    return obj
+  }, {})
+}
+
 export function getImageMimeType (imagePath: string): string | undefined {
   const fileExtension = /[^.]+$/.exec(imagePath)
   switch (fileExtension?.[0]) {