[FIX] Missing user data on files uploaded through the API

packages/rocketchat-api/server/v1/rooms.js

@@ -99,7 +99,8 @@ RocketChat.API.v1.addRoute('rooms.upload/:rid', { authRequired: true }, {
 			name: file.filename,
 			size: file.fileBuffer.length,
 			type: file.mimetype,
-			rid: this.urlParams.rid
+			rid: this.urlParams.rid,
+			userId: this.userId
 		};
 
 		Meteor.runAsUser(this.userId, () => {

server/publications/roomFiles.js

@@ -7,11 +7,11 @@ Meteor.publish('roomFiles', function(rid, limit = 50) {
 
 	const cursorFileListHandle = RocketChat.models.Uploads.findNotHiddenFilesOfRoom(rid, limit).observeChanges({
 		added(_id, record) {
-			const {username, name} = RocketChat.models.Users.findOneById(record.userId);
+			const {username, name} = record.userId ? RocketChat.models.Users.findOneById(record.userId) : {};
 			return pub.added('room_files', _id, {...record, user:{username, name}});
 		},
 		changed(_id, record) {
-			const {username, name} = RocketChat.models.Users.findOneById(record.userId);
+			const {username, name} = record.userId ? RocketChat.models.Users.findOneById(record.userId) : {};
 			return pub.changed('room_files', _id, {...record, user:{username, name}});
 		},
 		removed(_id, record) {

server/startup/migrations/v113.js

@@ -0,0 +1,31 @@
+RocketChat.Migrations.add({
+	version: 113,
+	up() {
+		if (RocketChat && RocketChat.models && RocketChat.models.Uploads && RocketChat.models.Messages) {
+			const fileQuery = {
+				userId: null
+			};
+
+			const filesToUpdate = RocketChat.models.Uploads.find(fileQuery);
+			filesToUpdate.forEach((file) => {
+				const messageQuery = {
+					'file._id' : file._id
+				};
+				const message = RocketChat.models.Messages.findOne(messageQuery);
+				if (message) {
+					const filter = {
+						_id: file._id
+					};
+
+					const update = {
+						$set: {
+							userId: message.u._id
+						}
+					};
+
+					RocketChat.models.Uploads.model.direct.update(filter, update);
+				}
+			});
+		}
+	}
+});