Add an api method for getting a single message by id, #6783

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

@@ -28,6 +28,28 @@ RocketChat.API.v1.addRoute('chat.delete', { authRequired: true }, {
 	}
 });
 
+RocketChat.API.v1.addRoute('chat.getMessage', { authRequired: true }, {
+	get() {
+		if (!this.queryParams.msgId) {
+			return RocketChat.API.v1.failure('The "msgId" query parameter must be provided.');
+		}
+
+
+		let msg;
+		Meteor.runAsUser(this.userId, () => {
+			msg = Meteor.call('getSingleMessage', this.queryParams.msgId);
+		});
+
+		if (!msg) {
+			return RocketChat.API.v1.failure();
+		}
+
+		return RocketChat.API.v1.success({
+			message: msg
+		});
+	}
+});
+
 RocketChat.API.v1.addRoute('chat.postMessage', { authRequired: true }, {
 	post() {
 		const messageReturn = processWebhookMessage(this.bodyParams, this.user)[0];

packages/rocketchat-lib/package.js

@@ -143,6 +143,7 @@ Package.onUse(function(api) {
 	api.addFiles('server/methods/getFullUserData.js', 'server');
 	api.addFiles('server/methods/getRoomRoles.js', 'server');
 	api.addFiles('server/methods/getServerInfo.js', 'server');
+	api.addFiles('server/methods/getSingleMessage.js', 'server');
 	api.addFiles('server/methods/getUserRoles.js', 'server');
 	api.addFiles('server/methods/insertOrUpdateUser.js', 'server');
 	api.addFiles('server/methods/joinDefaultChannels.js', 'server');

packages/rocketchat-lib/server/methods/getSingleMessage.js

+Meteor.methods({
+	getSingleMessage(msgId) {
+		check(msgId, String);
+
+		if (!Meteor.userId()) {
+			throw new Meteor.Error('error-invalid-user', 'Invalid user', { method: 'getSingleMessage' });
+		}
+
+		const msg = RocketChat.models.Messages.findOneById(msgId);
+
+		if (!msg && !msg.rid) {
+			return undefined;
+		}
+
+		Meteor.call('canAccessRoom', msg.rid, Meteor.userId());
+
+		return msg;
+	}
+});