session-desktop/ts/receiver/queuedJob.ts

import { queueAttachmentDownloads } from './attachments';

import { Quote } from './types';
import { PubKey } from '../session/types';
import _ from 'lodash';
import { getConversationController } from '../session/conversations';
import { ConversationModel, ConversationTypeEnum } from '../models/conversation';
import { MessageModel } from '../models/message';
import { getMessageById, getMessagesBySentAt } from '../../ts/data/data';

import { updateProfileOneAtATime } from './dataMessage';
import { SignalService } from '../protobuf';
import { UserUtils } from '../session/utils';

function contentTypeSupported(type: string): boolean {
  const Chrome = window.Signal.Util.GoogleChrome;
  return Chrome.isImageTypeSupported(type) || Chrome.isVideoTypeSupported(type);
}

// tslint:disable-next-line: cyclomatic-complexity
async function copyFromQuotedMessage(
  msg: MessageModel,
  quote?: SignalService.DataMessage.IQuote | null
): Promise<void> {
  if (!quote) {
    return;
  }
  const { attachments, id: quoteId, author } = quote;

  const quoteLocal: Quote = {
    attachments: attachments || null,
    author: author,
    id: _.toNumber(quoteId),
    text: null,
    referencedMessageNotFound: false,
  };

  const firstAttachment = attachments?.[0] || undefined;

  const id: number = _.toNumber(quoteId);

  // We always look for the quote by sentAt timestamp, for opengroups, closed groups and session chats
  // this will return an array of sent message by id we have locally.

  const collection = await getMessagesBySentAt(id);
  // we now must make sure this is the sender we expect
  const found = collection.find(message => {
    return Boolean(author === message.getSource());
  });

  if (!found) {
    window?.log?.warn(`We did not found quoted message ${id}.`);
    quoteLocal.referencedMessageNotFound = true;
    msg.set({ quote: quoteLocal });
    await msg.commit();
    return;
  }

  window?.log?.info(`Found quoted message id: ${id}`);
  quoteLocal.referencedMessageNotFound = false;

  quoteLocal.text = found.get('body') || '';

  // no attachments, just save the quote with the body
  if (
    !firstAttachment ||
    !firstAttachment.contentType ||
    !contentTypeSupported(firstAttachment.contentType)
  ) {
    msg.set({ quote: quoteLocal });
    await msg.commit();
    return;
  }

  firstAttachment.thumbnail = null;

  const queryAttachments = found.get('attachments') || [];

  if (queryAttachments.length > 0) {
    const queryFirst = queryAttachments[0];
    const { thumbnail } = queryFirst;

    if (thumbnail && thumbnail.path) {
      firstAttachment.thumbnail = {
        ...thumbnail,
        copied: true,
      };
    }
  }

  const queryPreview = found.get('preview') || [];
  if (queryPreview.length > 0) {
    const queryFirst = queryPreview[0];
    const { image } = queryFirst;

    if (image && image.path) {
      firstAttachment.thumbnail = {
        ...image,
        copied: true,
      };
    }
  }
  quoteLocal.attachments = [firstAttachment];

  msg.set({ quote: quoteLocal });
  await msg.commit();
  return;
}

function handleLinkPreviews(messageBody: string, messagePreview: any, message: MessageModel) {
  const urls = window.Signal.LinkPreviews.findLinks(messageBody);
  const incomingPreview = messagePreview || [];
  const preview = incomingPreview.filter(
    (item: any) => (item.image || item.title) && urls.includes(item.url)
  );
  if (preview.length < incomingPreview.length) {
    window?.log?.info(
      `${message.idForLogging()}: Eliminated ${preview.length -
        incomingPreview.length} previews with invalid urls'`
    );
  }

  message.set({ preview });
}

async function processProfileKey(
  conversation: ConversationModel,
  sendingDeviceConversation: ConversationModel,
  profileKeyBuffer?: Uint8Array
) {
  if (conversation.isPrivate()) {
    await conversation.setProfileKey(profileKeyBuffer);
  } else {
    await sendingDeviceConversation.setProfileKey(profileKeyBuffer);
  }
}

function handleMentions(
  message: MessageModel,
  conversation: ConversationModel,
  ourPrimaryNumber: PubKey
) {
  const body = message.get('body');
  if (body && body.indexOf(`@${ourPrimaryNumber.key}`) !== -1) {
    conversation.set({ mentionedUs: true });
  }
}

function updateReadStatus(message: MessageModel, conversation: ConversationModel) {
  const readSync = window.Whisper.ReadSyncs.forMessage(message);
  if (readSync) {
    const shouldExpire = message.get('expireTimer');
    const alreadyStarted = message.get('expirationStartTimestamp');
    if (shouldExpire && !alreadyStarted) {
      // Start message expiration timer
      const start = Math.min(readSync.get('read_at'), Date.now());
      message.set('expirationStartTimestamp', start);
    }
  }
  if (readSync || message.isExpirationTimerUpdate()) {
    message.set({ unread: 0 });

    // This is primarily to allow the conversation to mark all older
    // messages as read, as is done when we receive a read sync for
    // a message we already know about.
    void conversation.onReadMessage(message, Date.now());
  }
}

async function handleSyncedReceipts(message: MessageModel, conversation: ConversationModel) {
  // If the newly received message is from us, we assume that we've seen the messages up until that point
  const sentTimestamp = message.get('sent_at');
  if (sentTimestamp) {
    await conversation.markRead(sentTimestamp);
  }
}

export type RegularMessageType = Pick<
  SignalService.DataMessage,
  | 'attachments'
  | 'body'
  | 'flags'
  | 'openGroupInvitation'
  | 'quote'
  | 'preview'
  | 'profile'
  | 'profileKey'
  | 'expireTimer'
> & { isRegularMessage: true };

/**
 * This function is just used to make sure we do not forward things we shouldn't in the incoming message pipeline
 */
export function toRegularMessage(rawDataMessage: SignalService.DataMessage): RegularMessageType {
  return {
    ..._.pick(rawDataMessage, [
      'attachments',
      'preview',
      'body',
      'flags',
      'profileKey',
      'openGroupInvitation',
      'quote',
      'profile',
      'expireTimer',
    ]),
    isRegularMessage: true,
  };
}

async function handleRegularMessage(
  conversation: ConversationModel,
  message: MessageModel,
  rawDataMessage: RegularMessageType,
  source: string,
  messageHash: string
) {
  const type = message.get('type');
  await copyFromQuotedMessage(message, rawDataMessage.quote);

  if (rawDataMessage.openGroupInvitation) {
    message.set({ groupInvitation: rawDataMessage.openGroupInvitation });
  }

  handleLinkPreviews(rawDataMessage.body, rawDataMessage.preview, message);
  const existingExpireTimer = conversation.get('expireTimer');

  message.set({
    flags: rawDataMessage.flags,
    quote: rawDataMessage.quote,
    attachments: rawDataMessage.attachments,
    body: rawDataMessage.body,
    conversationId: conversation.id,
    messageHash,
    errors: [],
  });

  if (existingExpireTimer) {
    message.set({ expireTimer: existingExpireTimer });
  }

  // Expire timer updates are now explicit.
  // We don't handle an expire timer from a incoming message except if it is an ExpireTimerUpdate message.

  const ourPubKey = UserUtils.getOurPubKeyFromCache();

  handleMentions(message, conversation, ourPubKey);

  if (type === 'incoming') {
    updateReadStatus(message, conversation);
  }

  if (type === 'outgoing') {
    await handleSyncedReceipts(message, conversation);

    if (window.lokiFeatureFlags.useMessageRequests) {
      // assumes sync receipts are always from linked device outgoings
      await conversation.setIsApproved(true);
    }
  }

  const conversationActiveAt = conversation.get('active_at');
  if (!conversationActiveAt || (message.get('sent_at') || 0) > conversationActiveAt) {
    conversation.set({
      active_at: message.get('sent_at'),
      lastMessage: message.getNotificationText(),
    });
  }

  const sendingDeviceConversation = await getConversationController().getOrCreateAndWait(
    source,
    ConversationTypeEnum.PRIVATE
  );

  // Check if we need to update any profile names
  // the only profile we don't update with what is coming here is ours,
  // as our profile is shared accross our devices with a ConfigurationMessage
  if (type === 'incoming' && rawDataMessage.profile) {
    void updateProfileOneAtATime(
      sendingDeviceConversation,
      rawDataMessage.profile,
      rawDataMessage.profileKey
    );
  }

  if (rawDataMessage.profileKey) {
    await processProfileKey(conversation, sendingDeviceConversation, rawDataMessage.profileKey);
  }

  // we just received a message from that user so we reset the typing indicator for this convo
  await conversation.notifyTyping({
    isTyping: false,
    sender: source,
  });
}

async function handleExpirationTimerUpdate(
  conversation: ConversationModel,
  message: MessageModel,
  source: string,
  expireTimer: number
) {
  message.set({
    expirationTimerUpdate: {
      source,
      expireTimer,
    },
    unread: 0, // mark the message as read.
  });
  conversation.set({ expireTimer });

  await conversation.updateExpireTimer(expireTimer, source, message.get('received_at'));
}

export async function handleMessageJob(
  messageModel: MessageModel,
  conversation: ConversationModel,
  regularDataMessage: RegularMessageType,
  confirm: () => void,
  source: string,
  messageHash: string
) {
  window?.log?.info(
    `Starting handleSwarmDataMessage for message ${messageModel.idForLogging()}, ${messageModel.get(
      'serverTimestamp'
    ) || messageModel.get('timestamp')} in conversation ${conversation.idForLogging()}`
  );

  try {
    messageModel.set({ flags: regularDataMessage.flags });
    if (messageModel.isExpirationTimerUpdate()) {
      const { expireTimer } = regularDataMessage;
      const oldValue = conversation.get('expireTimer');
      if (expireTimer === oldValue) {
        confirm?.();
        window?.log?.info(
          'Dropping ExpireTimerUpdate message as we already have the same one set.'
        );
        return;
      }
      await handleExpirationTimerUpdate(conversation, messageModel, source, expireTimer);
    } else {
      await handleRegularMessage(
        conversation,
        messageModel,
        regularDataMessage,
        source,
        messageHash
      );
    }

    // save the message model to the db and it save the messageId generated to our copy
    const id = await messageModel.commit();
    messageModel.set({ id });

    // Note that this can save the message again, if jobs were queued. We need to
    //   call it after we have an id for this message, because the jobs refer back
    //   to their source message.

    void queueAttachmentDownloads(messageModel, conversation);

    const unreadCount = await conversation.getUnreadCount();
    conversation.set({ unreadCount });
    // this is a throttled call and will only run once every 1 sec
    conversation.updateLastMessage();
    await conversation.commit();

    try {
      // We go to the database here because, between the message save above and
      // the previous line's trigger() call, we might have marked all messages
      // unread in the database. This message might already be read!
      const fetched = await getMessageById(messageModel.get('id'));

      const previousUnread = messageModel.get('unread');

      // Important to update message with latest read state from database
      messageModel.merge(fetched);

      if (previousUnread !== messageModel.get('unread')) {
        window?.log?.warn(
          'Caught race condition on new message read state! ' + 'Manually starting timers.'
        );
        // We call markRead() even though the message is already
        // marked read because we need to start expiration
        // timers, etc.
        await messageModel.markRead(Date.now());
      }
    } catch (error) {
      window?.log?.warn(
        'handleSwarmDataMessage: Message',
        messageModel.idForLogging(),
        'was deleted'
      );
    }

    if (messageModel.get('unread')) {
      conversation.throttledNotify(messageModel);
    }

    confirm?.();
  } catch (error) {
    const errorForLog = error && error.stack ? error.stack : error;
    window?.log?.error(
      'handleSwarmDataMessage',
      messageModel.idForLogging(),
      'error:',
      errorForLog
    );

    throw error;
  }
}