server/src/services/ConversationService.ts

/*
 * Copyright (C) 2022 Savoir-faire Linux Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation; either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public
 * License along with this program.  If not, see
 * <https://www.gnu.org/licenses/>.
 */

import { IConversationRequest, IConversationSummary, Message, WebSocketMessageType } from 'jami-web-common';
import { Container, Service } from 'typedi';

import { ConversationRequestMetadata } from '../jamid/conversation-request-metadata.js';
import { Jamid } from '../jamid/jamid.js';
import { WebSocketServer } from '../websocket/websocket-server.js';
import { ContactService } from './ContactService.js';

const jamid = Container.get(Jamid);
const webSocketServer = Container.get(WebSocketServer);
const contactService = Container.get(ContactService);

@Service()
export class ConversationService {
  constructor() {
    jamid.events.onConversationRequestReceived.subscribe(async (signal) => {
      const conversationRequest = await this.createConversationRequest(signal.accountId, signal.metadata);
      webSocketServer.send(signal.accountId, WebSocketMessageType.ConversationRequest, conversationRequest);
    });
  }

  async createConversationRequest(
    accountId: string,
    jamidRequest: ConversationRequestMetadata
  ): Promise<IConversationRequest> {
    const contact = await contactService.getContactFromUri(accountId, jamidRequest.from);
    const membersNames = await this.getMembersNames(accountId, jamidRequest.id);

    // Currently, this does not actually works.
    // It seems the members can't be accessed yet. Same on jami-android
    if (membersNames.length === 0) {
      membersNames.push(contact.registeredName || contact.uri);
    }

    return {
      conversationId: jamidRequest.id,
      received: jamidRequest.received,
      from: contact,
      infos: {
        // Build a dataUrl from the avatar
        // TODO: Host the image and use a "normal" url instead
        avatar: `data:image/jpeg;base64,${jamidRequest.avatar}`,
        description: jamidRequest.description,
        mode: jamidRequest.mode,
        title: jamidRequest.title,
      },
      membersNames,
    };
  }

  async createConversationSummary(
    accountId: string,
    conversationId: string
  ): Promise<IConversationSummary | undefined> {
    const infos = jamid.getConversationInfos(accountId, conversationId);
    if (Object.keys(infos).length === 0) {
      return undefined;
    }
    // Build a dataUrl from the avatar
    // TODO: Host the image and use a "normal" url instead
    infos.avatar = `data:image/jpeg;base64,${infos.avatar}`;

    const membersNames = await this.getMembersNames(accountId, conversationId);
    let lastMessage: Message | undefined;
    // Skip "merge" type since they are of no interest for the user
    // Should we add some protection to prevent infinite loop?
    while (!lastMessage || lastMessage.type === 'merge') {
      lastMessage = (
        await jamid.getConversationMessages(accountId, conversationId, lastMessage?.linearizedParent || '', 1)
      )[0];
    }

    return {
      id: conversationId,
      avatar: infos.avatar,
      title: infos.title,
      membersNames,
      lastMessage,
    };
  }

  async getMembersNames(accountId: string, conversationId: string): Promise<string[]> {
    // Retrieve the URI of the current account (Account.username actually stores the URI rather than the username)
    const accountUri = jamid.getAccountDetails(accountId)['Account.username'];

    const members = jamid.getConversationMembers(accountId, conversationId);
    const membersNames: string[] = [];
    for (const member of members) {
      // Exclude current user from returned conversation members
      if (member.uri === accountUri) {
        continue;
      }

      // Add usernames for conversation members
      const { username } = await jamid.lookupAddress(member.uri, accountId);
      membersNames.push(username || member.uri);
    }

    return membersNames;
  }
}