feat: E2EE messages mentions

app/lib/constants/defaultSettings.ts

@@ -249,10 +249,16 @@ export const defaultSettings = {
 	CDN_PREFIX: {
 		type: 'valueAsString'
 	},
-	Accounts_RequirePasswordConfirmation:{
+	Accounts_RequirePasswordConfirmation: {
 		type: 'valueAsBoolean'
 	},
-	Accounts_ConfirmPasswordPlaceholder:{
+	Accounts_ConfirmPasswordPlaceholder: {
+		type: 'valueAsString'
+	},
+	E2E_Enabled_Mentions: {
+		type: 'valueAsBoolean'
+	},
+	UTF8_User_Names_Validation: {
 		type: 'valueAsString'
 	},
 	...deprecatedSettings

app/lib/encryption/room.ts

@@ -15,6 +15,7 @@ import {
 	bufferToB64,
 	bufferToB64URI,
 	bufferToUtf8,
+	getE2EEMentions,
 	joinVectorData,
 	splitVectorData,
 	toString,
@@ -234,7 +235,8 @@ export default class EncryptionRoom {
 				...message,
 				t: E2E_MESSAGE_TYPE,
 				e2e: E2E_STATUS.PENDING,
-				msg
+				msg,
+				e2eMentions: getE2EEMentions(message.msg)
 			};
 		} catch {
 			// Do nothing

app/lib/encryption/utils.ts

@@ -3,6 +3,7 @@ import SimpleCrypto from 'react-native-simple-crypto';
 
 import { random } from '../methods/helpers';
 import { fromByteArray, toByteArray } from './helpers/base64-js';
+import { store } from '../store/auxStore';
 
 const BASE64URI = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_';
 
@@ -58,3 +59,22 @@ export const toString = (thing: string | ByteBuffer | Buffer | ArrayBuffer | Uin
 	return new ByteBuffer.wrap(thing).toString('binary');
 };
 export const randomPassword = (): string => `${random(3)}-${random(3)}-${random(3)}`.toLowerCase();
+
+// https://github.com/RocketChat/Rocket.Chat/blob/b94db45cab297a3bcbafca4d135d83c898222380/apps/meteor/app/mentions/lib/MentionsParser.ts#L50
+const userMentionRegex = (pattern: string) => new RegExp(`(^|\\s|>)@(${pattern}(@(${pattern}))?(:([0-9a-zA-Z-_.]+))?)`, 'gm');
+const channelMentionRegex = (pattern: string) => new RegExp(`(^|\\s|>)#(${pattern}(@(${pattern}))?)`, 'gm');
+
+export const getE2EEMentions = (message?: string) => {
+	const e2eEnabledMentions = store.getState().settings.E2E_Enabled_Mentions;
+	if (!e2eEnabledMentions || !message) {
+		return undefined;
+	}
+	const utf8UserNamesValidation = store.getState().settings.UTF8_User_Names_Validation as string;
+
+	return {
+		e2eUserMentions: (message.match(userMentionRegex(utf8UserNamesValidation)) || []).map(match => match.trim()),
+		e2eUserMentionse2eChannelMentions: (message.match(channelMentionRegex(utf8UserNamesValidation)) || []).map(match =>
+			match.trim()
+		)
+	};
+};