index.js

const TelegramBot = require('node-telegram-bot-api');
const downloadUtils = require('./download_tools/utils.js');
const dlVars = require('./download_tools/vars.js');
const ariaTools = require('./download_tools/aria-tools.js');
const constants = require('./.constants.js');
const msgTools = require('./msg-tools.js');
const driveList = require('./drive/drive-list.js');
const driveUtils = require('./drive/drive-utils.js');

const options = {
  polling: true
};
const bot = new TelegramBot(constants.TOKEN, options);
var websocketOpened = false;
var statusInterval;

initAria2();

bot.onText(/^\/start/, (msg) => {
  if (msgTools.isAuthorized(msg) < 0) {
    sendUnauthorizedMessage(msg);
  } else {
    sendMessage(msg, 'You should know the commands already. Happy mirroring.');
  }
});

bot.onText(/^\/mirrortar (.+)/i, (msg, match) => {
  if (msgTools.isAuthorized(msg) < 0) {
    sendUnauthorizedMessage(msg);
  } else {
    mirror(msg, match, true);
  }
});

bot.onText(/^\/mirror (.+)/i, (msg, match) => {
  if (msgTools.isAuthorized(msg) < 0) {
    sendUnauthorizedMessage(msg);
  } else {
    mirror(msg, match);
  }
});

bot.on('message', (msg) => {
  if (dlVars.isDownloading && msg.chat.id === dlVars.tgChatId) {
    if (dlVars.messagesSinceStart) {
      if (dlVars.messagesSinceStart < 10) {
        dlVars.messagesSinceStart++;
      }
    } else {
      dlVars.messagesSinceStart = 1;
    }
  }
});

/**
 * Start a new download operation. Only one is allowed at a time. Make sure
 * that this is triggered by an authorized user, because this function itself
 * does not check for that.
 * @param {Object} msg The Message that triggered the download
 * @param {Array} match Message matches
 * @param {boolean} isTar Decides if this download should be archived before upload
 */
function mirror (msg, match, isTar) {
  if (websocketOpened) {
    if (dlVars.isDownloading) {
      sendMessage(msg, dlVars.tgUsername + ' is mirroring something. Please wait.');
    } else {
      if (downloadUtils.isDownloadAllowed(match[1])) {
        prepDownload(msg, match[1], isTar);
      } else {
        sendMessage(msg, `Download failed. Blacklisted URL.`);
      }
    }
  } else {
    sendMessage(msg, `Websocket isn't open. Can't download`);
  }
}

bot.onText(/^\/mirrorStatus/i, (msg) => {
  if (msgTools.isAuthorized(msg) < 0) {
    sendUnauthorizedMessage(msg);
  } else {
    sendStatusMessage(msg, undefined, 1);
  }
});

function getStatus (msg, callback) {
  var authorizedCode;
  if (msg) {
    authorizedCode = msgTools.isAuthorized(msg);
  } else {
    authorizedCode = 1;
  }

  if (authorizedCode > -1) {
    if (dlVars.isDownloading) {
      if (dlVars.isUploading) {
        callback(null, 'Upload in progress.');
      } else {
        ariaTools.getStatus(dlVars.downloadGid, (err, message, filename, filesize) => {
          if (!err) {
            handleDisallowedFilename(filename);
            callback(null, message);
          } else {
            console.log('status: ', err);
            callback(err, null);
          }
        });
      }
    } else {
      callback(null, 'No active downloads');
    }
  } else {
    callback(null, `You aren't authorized to use this bot here.`);
  }
}

bot.onText(/^\/list (.+)/i, (msg, match) => {
  if (msgTools.isAuthorized(msg) < 0) {
    sendUnauthorizedMessage(msg);
  } else {
    driveList.listFiles(match[1], (err, res) => {
      if (err) {
        sendMessage(msg, 'Failed to fetch the list of files');
      } else {
        sendMessage(msg, res, 60000);
      }
    });
  }
});

bot.onText(/^\/getFolder/i, (msg) => {
  if (msgTools.isAuthorized(msg) < 0) {
    sendUnauthorizedMessage(msg);
  } else {
    sendMessage(msg,
      '<a href = \'' + driveUtils.getFileLink(constants.GDRIVE_PARENT_DIR_ID, true) + '\'>Drive mirror folder</a>',
      60000);
  }
});

bot.onText(/^\/cancelMirror/i, (msg) => {
  var authorizedCode = msgTools.isAuthorized(msg);
  if (authorizedCode > -1 && authorizedCode < 3) {
    cancelMirror(msg);
  } else if (authorizedCode === 3) {
    msgTools.isAdmin(bot, msg, (e, res) => {
      if (res) {
        cancelMirror(msg);
      } else {
        sendMessage(msg, 'You do not have the permission to do that.');
      }
    });
  } else {
    sendMessage(msg, 'You cannot use this bot here.');
  }
});

function cancelMirror (msg) {
  if (dlVars.isDownloading) {
    if (dlVars.isUploading) {
      if (msg) {
        sendMessage(msg, 'Upload in progress. Cannot cancel.');
      }
    } else {
      ariaTools.stopDownload(dlVars.downloadGid, () => {
        // Not sending a message here, because a cancel will fire
        // the onDownloadStop notification, which will notify the
        // person who started the download

        if (msg && dlVars.tgChatId !== msg.chat.id) {
          // Notify if this is not the chat the download started in
          sendMessage(msg, 'The download was canceled.');
        }
      });
    }
  } else if (msg) {
    sendMessage(msg, 'No download in progress.');
  }
}

/**
 * Cancels the download if its filename contains a string from
 * constants.ARIA_FILTERED_FILENAMES. Call this on every status message update,
 * because the file name might not become visible for the first few status
 * updates, for example, in case of BitTorrents.
 *
 * @param {String} filename The name of the downloaded file/top level directory
 * @returns {boolean} False if file name is disallowed, true otherwise,
 *                    or if undetermined
 */
function handleDisallowedFilename (filename) {
  if (dlVars.isDownloadAllowed === 0) return false;
  if (dlVars.isDownloadAllowed === 1) return true;
  if (!filename) return true;

  var isAllowed = downloadUtils.isFilenameAllowed(filename);
  if (isAllowed === 0) {
    dlVars.isDownloadAllowed = 0;
    if (dlVars.isDownloading && !dlVars.isUploading) {
      cancelMirror();
    }
    return false;
  } else if (isAllowed === 1) {
    dlVars.isDownloadAllowed = 1;
  }
  return true;
}

function prepDownload (msg, match, isTar) {
  sendMessage(msg, 'Preparing', -1, statusMessage => {
    downloadUtils.setDownloadVars(msg, statusMessage, isTar);
    download(match);
  });
}

function download (match) {
  ariaTools.addUri([match],
    (err, gid) => {
      if (err) {
        console.log('Failure', err);
        sendMessageReplyOriginal(`Failed to start the download. ${err['message']}`);
        statusInterval = null;
        msgTools.notifyExternal(false, gid, dlVars.tgChatId);
        downloadUtils.cleanupDownload();
      } else {
        console.log(`download:${match} gid:${gid}`);
      }
    });
}

function sendMessage (msg, text, delay, callback, quickDeleteOriginal) {
  if (!delay) delay = 5000;
  bot.sendMessage(msg.chat.id, text, {
    reply_to_message_id: msg.message_id,
    parse_mode: 'HTML'
  })
    .then((res) => {
      if (callback) callback(res);
      if (delay > -1) {
        msgTools.deleteMsg(bot, res, delay);
        if (quickDeleteOriginal) {
          msgTools.deleteMsg(bot, msg);
        } else {
          msgTools.deleteMsg(bot, msg, delay);
        }
      }
    })
    .catch((ignored) => { });
}

function sendUnauthorizedMessage (msg) {
  sendMessage(msg, `You aren't authorized to use this bot here.`);
}

function sendMessageReplyOriginal (message) {
  bot.sendMessage(dlVars.tgChatId, message, {
    reply_to_message_id: dlVars.tgMessageId,
    parse_mode: 'HTML'
  })
    .catch((ignored) => { });
}

function sendStatusMessage (msg) {
  // Skipping 0, which is the reply to the download command message
  var index = downloadUtils.indexOfStatus(msg.chat.id, 1);

  if (index > -1) {
    msgTools.deleteMsg(bot, dlVars.statusMsgsList[index]);
    downloadUtils.deleteStatus(index);
  }

  getStatus(msg, (err, text) => {
    if (!err) {
      sendMessage(msg, text, 60000, message => {
        downloadUtils.addStatus(message);
      }, true);
    }
  });
}

function updateStatusMessage (msg, text) {
  if (!text) {
    getStatus(msg, (err, text) => {
      if (!err) editMessage(msg, text);
    });
  } else {
    editMessage(msg, text);
  }
}

function editMessage (msg, text) {
  if (msg && msg.chat && msg.chat.id && msg.message_id) {
    bot.editMessageText(text, {
      chat_id: msg.chat.id,
      message_id: msg.message_id,
      parse_mode: 'HTML'
    })
      .catch(ignored => { });
  }
}

function updateAllStatus (message) {
  if (message) {
    dlVars.statusMsgsList.forEach(status => {
      editMessage(status, message);
    });
  } else {
    getStatus(null, (err, text) => {
      if (err) return;
      dlVars.statusMsgsList.forEach(status => {
        editMessage(status, text);
      });
    });
  }
}

/**
 * Deletes the bot's original response to the download command, if less
 * than 10 messages have been sent to the group the download started in,
 * since the download was started. Also deletes if the bot doesn't have
 * message read permissions.
 **/
function deleteOrigReply () {
  /* Reason: The download task has been completed, and a new status message
   * has been sent. No need to clutter the group with dulpicate status.
   */
  if (!dlVars.messagesSinceStart || dlVars.messagesSinceStart < 10) {
    msgTools.deleteMsg(bot, dlVars.statusMsgsList[0], 0);
  }
}

function initAria2 () {
  ariaTools.openWebsocket((err) => {
    if (err) {
      console.log('A2C: Failed to open websocket. Exiting.');
      process.exit(1);
    } else {
      websocketOpened = true;
      console.log('A2C: Websocket opened');
    }
  });

  ariaTools.setOnDownloadStart((gid) => {
    dlVars.isDownloading = true;
    dlVars.isUploading = false;
    dlVars.downloadGid = gid;
    console.log('start', gid);
    // downloadUtils.setDownloadVars makes sure the first element in the list refers
    // to the download command's message
    updateStatusMessage(dlVars.statusMsgsList[0], 'Download started.');

    ariaTools.getStatus(dlVars.downloadGid, (err, message, filename) => {
      if (!err) {
        handleDisallowedFilename(filename);
      }
    });

    if (!statusInterval) {
      statusInterval = setInterval(updateAllStatus, 4000);
    }
  });
  ariaTools.setOnDownloadStop((gid) => {
    console.log('stop', gid);
    clearInterval(statusInterval);
    statusInterval = null;
    var message = 'Download stopped.';
    if (dlVars.isDownloadAllowed === 0) {
      message += ' Blacklisted file name.';
    }
    sendMessageReplyOriginal(message);
    updateAllStatus(message);
    deleteOrigReply();
    msgTools.notifyExternal(false, gid, dlVars.tgChatId);
    downloadUtils.cleanupDownload();
  });
  ariaTools.setOnDownloadComplete((gid) => {
    ariaTools.getAriaFilePath(gid, (err, file) => {
      if (err) {
        console.log('onDownloadComplete: ' + JSON.stringify(err, null, 2));
        clearInterval(statusInterval);
        statusInterval = null;
        var message = 'Upload failed. Could not get downloaded files.';
        sendMessageReplyOriginal(message);
        updateAllStatus(message);
        deleteOrigReply();
        msgTools.notifyExternal(false, gid, dlVars.tgChatId);
        downloadUtils.cleanupDownload();
        return;
      }
      if (file) {
        ariaTools.getFileSize(gid, (err, size) => {
          if (err) {
            console.log('onDownloadComplete: ' + JSON.stringify(err, null, 2));
            clearInterval(statusInterval);
            statusInterval = null;
            var message = 'Upload failed. Could not get file size.';
            sendMessageReplyOriginal(message);
            updateAllStatus(message);
            deleteOrigReply();
            msgTools.notifyExternal(false, gid, dlVars.tgChatId);
            downloadUtils.cleanupDownload();
            return;
          }

          var filename = downloadUtils.getFileNameFromPath(file);
          dlVars.isUploading = true;
          if (handleDisallowedFilename(filename)) {
            console.log('onDownloadComplete: ' + file);
            ariaTools.uploadFile(file, size, driveUploadCompleteCallback);
          } else {
            var reason = 'Upload failed. Blacklisted file name.';
            sendMessageReplyOriginal(reason);
            updateAllStatus(reason);
            deleteOrigReply();
            msgTools.notifyExternal(false, gid, dlVars.tgChatId);
            downloadUtils.cleanupDownload();
          }
        });
      } else {
        console.log('onDownloadComplete: No files');
      }
    });
  });
  ariaTools.setOnDownloadError((gid) => {
    console.log('error', gid);
    clearInterval(statusInterval);
    statusInterval = null;
    var message = 'Download error.';
    sendMessageReplyOriginal(message);
    updateAllStatus(message);
    deleteOrigReply();
    msgTools.notifyExternal(false, gid, dlVars.tgChatId);
    downloadUtils.cleanupDownload();
  });
}

function driveUploadCompleteCallback (err, url, filePath, fileName) {
  clearInterval(statusInterval);
  statusInterval = null;
  var finalMessage;
  if (err) {
    var message;
    try {
      message = JSON.stringify(err, null, 2);
    } catch (ignored) {
      message = err;
    }
    console.log(`uploadFile: ${filePath}: ${message}`);
    finalMessage = `Failed to upload <code>${fileName}</code> to Drive.${message}`;
    msgTools.notifyExternal(false, dlVars.downloadGid, dlVars.tgChatId);
  } else {
    finalMessage = `<a href='${url}'>${fileName}</a>`;
    msgTools.notifyExternal(true, dlVars.downloadGid, url, dlVars.tgChatId);
  }
  sendMessageReplyOriginal(finalMessage);
  updateAllStatus(finalMessage);
  deleteOrigReply();
  downloadUtils.cleanupDownload();
}