link-stack/apps/metamigo-api/src/app/services/whatsapp.ts

import { Server } from "@hapi/hapi";
import { Service } from "@hapipal/schmervice";
import { SavedWhatsappBot as Bot } from "@digiresilience/metamigo-db";
import makeWASocket, {
  DisconnectReason,
  proto,
  downloadContentFromMessage,
  MediaType,
  AnyMessageContent,
  WAProto,
  MiscMessageGenerationOptions,
} from "@adiwajshing/baileys";
import workerUtils from "../../worker-utils";
import { useDatabaseAuthState } from "../lib/whatsapp-key-store";

export type AuthCompleteCallback = (error?: string) => void;

export type Connection = {
  end: (error: Error | undefined) => void;
  sendMessage: (
    jid: string,
    content: AnyMessageContent,
    options?: MiscMessageGenerationOptions
  ) => Promise<WAProto.WebMessageInfo | undefined>;
};

export default class WhatsappService extends Service {
  connections: { [key: string]: Connection } = {};

  static browserDescription: [string, string, string] = [
    "Metamigo",
    "Chrome",
    "2.0",
  ];

  constructor(server: Server, options: never) {
    super(server, options);
  }

  async initialize(): Promise<void> {
    this.updateConnections();
  }

  async teardown(): Promise<void> {
    this.resetConnections();
  }

  private async sleep(ms: number): Promise<void> {
    console.log(`pausing ${ms}`);
    return new Promise((resolve) => setTimeout(resolve, ms));
  }

  private async resetConnections() {
    for (const connection of Object.values(this.connections)) {
      try {
        connection.end(null);
      } catch (error) {
        console.log(error);
      }
    }

    this.connections = {};
  }

  private createConnection(
    bot: Bot,
    server: Server,
    options: any,
    authCompleteCallback?: any
  ) {
    const { state, saveState } = useDatabaseAuthState(bot, server);
    const connection = makeWASocket({ ...options, auth: state });
    let pause = 5000;
    connection.ev.on("connection.update", async (update) => {
      console.log(`Connection updated ${JSON.stringify(update, null, 2)}`);
      const {
        connection: connectionState,
        lastDisconnect,
        qr,
        isNewLogin,
      } = update;
      if (qr) {
        console.log("got qr code");
        await this.server.db().whatsappBots.updateQR(bot, qr);
      } else if (isNewLogin) {
        console.log("got new login");
      } else if (connectionState === "open") {
        console.log("opened connection");
      } else if (connectionState === "close") {
        console.log("connection closed due to", lastDisconnect.error);
        const disconnectStatusCode = (lastDisconnect?.error as any)?.output
          ?.statusCode;
        if (disconnectStatusCode === DisconnectReason.restartRequired) {
          console.log("reconnecting after got new login");
          const updatedBot = await this.findById(bot.id);
          this.createConnection(updatedBot, server, options);
          authCompleteCallback();
        } else if (disconnectStatusCode !== DisconnectReason.loggedOut) {
          console.log("reconnecting");
          await this.sleep(pause);
          pause *= 2;
          this.createConnection(bot, server, options);
        }
      }
    });

    connection.ev.process(async (events) => {
      if (events["messaging-history.set"]) {
        const { chats, contacts, messages, isLatest } =
          events["messaging-history.set"];
        console.log(
          `recv ${chats.length} chats, ${contacts.length} contacts, ${messages.length} msgs (is latest: ${isLatest})`
        );
      }
    });

    connection.ev.on("messages.upsert", async (m) => {
      console.log("messages upsert");
      const { messages } = m;
      if (messages) {
        await this.queueUnreadMessages(bot, messages);
      }
    });
    connection.ev.on("messages.update", (m) => console.log(m));
    connection.ev.on("message-receipt.update", (m) => console.log(m));
    connection.ev.on("presence.update", (m) => console.log(m));
    connection.ev.on("chats.update", (m) => console.log(m));
    connection.ev.on("contacts.upsert", (m) => console.log(m));
    connection.ev.on("creds.update", saveState);

    this.connections[bot.id] = connection;
  }

  private async updateConnections() {
    this.resetConnections();

    const bots = await this.server.db().whatsappBots.findAll();
    for await (const bot of bots) {
      if (bot.isVerified) {
        this.createConnection(bot, this.server, {
          browser: WhatsappService.browserDescription,
          printQRInTerminal: false,
          version: [2, 2204, 13],
        });
      }
    }
  }

  private async queueMessage(bot: Bot, webMessageInfo: proto.WebMessageInfo) {
    const { key, message, messageTimestamp } = webMessageInfo;
    const { remoteJid } = key;

    if (!key.fromMe && message && remoteJid !== "status@broadcast") {
      const isMediaMessage =
        message.audioMessage ||
        message.documentMessage ||
        message.imageMessage ||
        message.videoMessage;

      const messageContent = Object.values(message)[0];
      let messageType: MediaType;
      let attachment: string;
      let filename: string;
      let mimetype: string;
      if (isMediaMessage) {
        if (message.audioMessage) {
          messageType = "audio";
          filename =
            key.id + "." + message.audioMessage.mimetype.split("/").pop();
          mimetype = message.audioMessage.mimetype;
        } else if (message.documentMessage) {
          messageType = "document";
          filename = message.documentMessage.fileName;
          mimetype = message.documentMessage.mimetype;
        } else if (message.imageMessage) {
          messageType = "image";
          filename =
            key.id + "." + message.imageMessage.mimetype.split("/").pop();
          mimetype = message.imageMessage.mimetype;
        } else if (message.videoMessage) {
          messageType = "video";
          filename =
            key.id + "." + message.videoMessage.mimetype.split("/").pop();
          mimetype = message.videoMessage.mimetype;
        }

        const stream = await downloadContentFromMessage(
          messageContent,
          messageType
        );
        let buffer = Buffer.from([]);
        for await (const chunk of stream) {
          buffer = Buffer.concat([buffer, chunk]);
        }

        attachment = buffer.toString("base64");
      }

      if (messageContent || attachment) {
        const receivedMessage = {
          waMessageId: key.id,
          waMessage: JSON.stringify(webMessageInfo),
          waTimestamp: new Date((messageTimestamp as number) * 1000),
          attachment,
          filename,
          mimetype,
          whatsappBotId: bot.id,
          botPhoneNumber: bot.phoneNumber,
        };

        workerUtils.addJob("whatsapp-message", receivedMessage, {
          jobKey: key.id,
        });
      }
    }
  }

  private async queueUnreadMessages(bot: Bot, messages: any[]) {
    for await (const message of messages) {
      await this.queueMessage(bot, message);
    }
  }

  async create(
    phoneNumber: string,
    description: string,
    email: string
  ): Promise<Bot> {
    const db = this.server.db();
    const user = await db.users.findBy({ email });
    const row = await db.whatsappBots.insert({
      phoneNumber,
      description,
      userId: user.id,
    });
    return row;
  }

  async findAll(): Promise<Bot[]> {
    return this.server.db().whatsappBots.findAll();
  }

  async findById(id: string): Promise<Bot> {
    return this.server.db().whatsappBots.findById({ id });
  }

  async findByToken(token: string): Promise<Bot> {
    return this.server.db().whatsappBots.findBy({ token });
  }

  async register(bot: Bot, callback: AuthCompleteCallback): Promise<void> {
    await this.createConnection(
      bot,
      this.server,
      { version: [2, 2204, 13] },
      callback
    );
  }

  async send(bot: Bot, phoneNumber: string, message: string): Promise<void> {
    const connection = this.connections[bot.id];
    const recipient = `${phoneNumber.replace(/\D+/g, "")}@s.whatsapp.net`;
    await connection.sendMessage(recipient, { text: message });
  }

  async receiveSince(bot: Bot, lastReceivedDate: Date): Promise<void> {
    const connection = this.connections[bot.id];
    const messages = await connection.messagesReceivedAfter(
      lastReceivedDate,
      false
    );
    for (const message of messages) {
      this.queueMessage(bot, message);
    }
  }

  async receive(bot: Bot, lastReceivedDate: Date): Promise<any> {
    const connection = this.connections[bot.id];
    // const messages = await connection.messagesReceivedAfter(
    //   lastReceivedDate,
    //   false
    // );

    const messages = await connection.loadAllUnreadMessages();
    return messages;
  }
}