session-desktop/ts/interactions/conversations/unsendingInteractions.ts

import { compact } from 'lodash';
import { getMessageById } from '../../data/data';
import { ConversationModel } from '../../models/conversation';
import { MessageModel } from '../../models/message';
import { ApiV2 } from '../../session/apis/open_group_api/opengroupV2';
import { getMessageQueue } from '../../session';
import { getConversationController } from '../../session/conversations';
import { UnsendMessage } from '../../session/messages/outgoing/controlMessage/UnsendMessage';
import { ed25519Str } from '../../session/onions/onionPath';
import { networkDeleteMessages } from '../../session/apis/snode_api/SNodeAPI';
import { PubKey } from '../../session/types';
import { ToastUtils, UserUtils } from '../../session/utils';
import { resetSelectedMessageIds } from '../../state/ducks/conversations';
import { updateConfirmModal } from '../../state/ducks/modalDialog';
import { SessionButtonColor } from '../../components/basic/SessionButton';

/**
 * Deletes messages for everyone in a 1-1 or everyone in a closed group conversation.
 */
async function unsendMessagesForEveryone(
  conversation: ConversationModel,
  msgsToDelete: Array<MessageModel>
) {
  window?.log?.info('Deleting messages for all users in this conversation');
  const destinationId = conversation.id;
  if (!destinationId) {
    return;
  }
  if (conversation.isOpenGroupV2()) {
    throw new Error(
      'Cannot unsend a message for an opengroup v2. This has to be a deleteMessage api call'
    );
  }
  const unsendMsgObjects = getUnsendMessagesObjects(msgsToDelete);

  if (conversation.isPrivate()) {
    // sending to recipient all the messages separately for now
    await Promise.all(
      unsendMsgObjects.map(unsendObject =>
        getMessageQueue()
          .sendToPubKey(new PubKey(destinationId), unsendObject)
          .catch(window?.log?.error)
      )
    );
    await Promise.all(
      unsendMsgObjects.map(unsendObject =>
        getMessageQueue()
          .sendSyncMessage(unsendObject)
          .catch(window?.log?.error)
      )
    );
  } else if (conversation.isClosedGroup()) {
    // sending to recipient all the messages separately for now
    await Promise.all(
      unsendMsgObjects.map(unsendObject => {
        getMessageQueue()
          .sendToGroup(unsendObject, undefined, new PubKey(destinationId))
          .catch(window?.log?.error);
      })
    );
  }
  await deleteMessagesFromSwarmAndCompletelyLocally(conversation, msgsToDelete);

  window.inboxStore?.dispatch(resetSelectedMessageIds());
  ToastUtils.pushDeleted(msgsToDelete.length);
}

function getUnsendMessagesObjects(messages: Array<MessageModel>) {
  //#region building request
  return compact(
    messages.map(message => {
      const author = message.get('source');

      // call getPropsForMessage here so we get the received_at or sent_at timestamp in timestamp
      const timestamp = message.getPropsForMessage().timestamp;
      if (!timestamp) {
        window?.log?.error('cannot find timestamp - aborting unsend request');
        return undefined;
      }

      const unsendParams = {
        timestamp,
        author,
      };

      return new UnsendMessage(unsendParams);
    })
  );
  //#endregion
}

/**
 * Do a single request to the swarm with all the message hashes to delete from the swarm.
 *
 * It does not delete anything locally.
 *
 * Returns true if no errors happened, false in an error happened
 */
export async function deleteMessagesFromSwarmOnly(messages: Array<MessageModel>) {
  try {
    const deletionMessageHashes = compact(messages.map(m => m.get('messageHash')));
    if (deletionMessageHashes.length > 0) {
      const errorOnSnode = await networkDeleteMessages(deletionMessageHashes);
      return errorOnSnode === null || errorOnSnode.length === 0;
    }
    window.log?.warn(
      'deleteMessagesFromSwarmOnly: We do not have hashes for some of those messages'
    );
    return false;
  } catch (e) {
    window.log?.error('deleteMessagesFromSwarmOnly: Error deleting message from swarm', e);
    return false;
  }
}

/**
 * Delete the messages from the swarm with an unsend request and if it worked, delete those messages locally.
 * If an error happened, we just return false, Toast an error, and do not remove the messages locally at all.
 */
export async function deleteMessagesFromSwarmAndCompletelyLocally(
  conversation: ConversationModel,
  messages: Array<MessageModel>
) {
  if (conversation.isMediumGroup()) {
    window.log.info('Cannot delete message from a closed group swarm, so we just complete delete.');
    await Promise.all(
      messages.map(async message => {
        return deleteMessageLocallyOnly({ conversation, message, deletionType: 'complete' });
      })
    );
    return;
  }
  window.log.warn(
    'Deleting from swarm of ',
    ed25519Str(conversation.id),
    ' hashes: ',
    messages.map(m => m.get('messageHash'))
  );
  const deletedFromSwarm = await deleteMessagesFromSwarmOnly(messages);
  if (!deletedFromSwarm) {
    window.log.warn(
      'deleteMessagesFromSwarmAndCompletelyLocally: some messages failed to be deleted. Maybe they were already deleted?'
    );
  }
  await Promise.all(
    messages.map(async message => {
      return deleteMessageLocallyOnly({ conversation, message, deletionType: 'complete' });
    })
  );
}

/**
 * Delete the messages from the swarm with an unsend request and if it worked, mark those messages locally as deleted but do not remove them.
 * If an error happened, we still mark the message locally as deleted.
 */
export async function deleteMessagesFromSwarmAndMarkAsDeletedLocally(
  conversation: ConversationModel,
  messages: Array<MessageModel>
) {
  if (conversation.isMediumGroup()) {
    window.log.info('Cannot delete messages from a closed group swarm, so we just markDeleted.');
    await Promise.all(
      messages.map(async message => {
        return deleteMessageLocallyOnly({ conversation, message, deletionType: 'markDeleted' });
      })
    );
    return;
  }
  const deletedFromSwarm = await deleteMessagesFromSwarmOnly(messages);
  if (!deletedFromSwarm) {
    window.log.warn(
      'deleteMessagesFromSwarmAndMarkAsDeletedLocally: some messages failed to be deleted but still removing the messages content... '
    );
  }
  await Promise.all(
    messages.map(async message => {
      return deleteMessageLocallyOnly({ conversation, message, deletionType: 'markDeleted' });
    })
  );
}

/**
 * Deletes a message completely or mark it as deleted only. Does not interact with the swarm at all
 * @param message Message to delete
 * @param deletionType 'complete' means completely delete the item from the database, markDeleted means empty the message content but keep an entry
 */
export async function deleteMessageLocallyOnly({
  conversation,
  message,
  deletionType,
}: {
  conversation: ConversationModel;
  message: MessageModel;
  deletionType: 'complete' | 'markDeleted';
}) {
  if (deletionType === 'complete') {
    // remove the message from the database
    await conversation.removeMessage(message.get('id'));
  } else {
    // just mark the message as deleted but still show in conversation
    await message.markAsDeleted();
    await message.markRead(Date.now());
  }
  conversation.updateLastMessage();
}

/**
 * Send an UnsendMessage synced message so our devices removes those messages locally,
 * and send an unsend request on our swarm so this message is effectively removed.
 *
 * Show a toast on error/success and reset the selection
 */
async function unsendMessageJustForThisUser(
  conversation: ConversationModel,
  msgsToDelete: Array<MessageModel>
) {
  window?.log?.warn('Deleting messages just for this user');

  const unsendMsgObjects = getUnsendMessagesObjects(msgsToDelete);

  // sending to our other devices all the messages separately for now
  await Promise.all(
    unsendMsgObjects.map(unsendObject =>
      getMessageQueue()
        .sendSyncMessage(unsendObject)
        .catch(window?.log?.error)
    )
  );
  await deleteMessagesFromSwarmAndCompletelyLocally(conversation, msgsToDelete);

  // Update view and trigger update
  window.inboxStore?.dispatch(resetSelectedMessageIds());
  ToastUtils.pushDeleted(msgsToDelete.length);
}

const doDeleteSelectedMessagesInSOGS = async (
  selectedMessages: Array<MessageModel>,
  conversation: ConversationModel,
  isAllOurs: boolean
) => {
  const ourDevicePubkey = UserUtils.getOurPubKeyStrFromCache();
  if (!ourDevicePubkey) {
    return;
  }
  //#region open group v2 deletion
  // Get our Moderator status
  const isAdmin = conversation.isAdmin(ourDevicePubkey);

  if (!isAllOurs && !isAdmin) {
    ToastUtils.pushMessageDeleteForbidden();
    window.inboxStore?.dispatch(resetSelectedMessageIds());
    return;
  }

  const toDeleteLocallyIds = await deleteOpenGroupMessages(selectedMessages, conversation);
  if (toDeleteLocallyIds.length === 0) {
    // Message failed to delete from server, show error?
    return;
  }
  await Promise.all(
    toDeleteLocallyIds.map(async id => {
      const msgToDeleteLocally = await getMessageById(id);
      if (msgToDeleteLocally) {
        return deleteMessageLocallyOnly({
          conversation,
          message: msgToDeleteLocally,
          deletionType: 'complete',
        });
      }
    })
  );
  // successful deletion
  ToastUtils.pushDeleted(toDeleteLocallyIds.length);
  window.inboxStore?.dispatch(resetSelectedMessageIds());
  //#endregion
};

/**
 * Effectively delete the messages from a conversation.
 * This call is to be called by the user on a confirmation dialog for instance.
 *
 * It does what needs to be done on a user action to delete messages for each conversation type
 */
const doDeleteSelectedMessages = async ({
  conversation,
  selectedMessages,
  deleteForEveryone,
}: {
  selectedMessages: Array<MessageModel>;
  conversation: ConversationModel;
  deleteForEveryone: boolean;
}) => {
  const ourDevicePubkey = UserUtils.getOurPubKeyStrFromCache();
  if (!ourDevicePubkey) {
    return;
  }

  const isAllOurs = selectedMessages.every(message => ourDevicePubkey === message.getSource());
  if (conversation.isPublic()) {
    return doDeleteSelectedMessagesInSOGS(selectedMessages, conversation, isAllOurs);
  }

  //#region deletion for 1-1 and closed groups

  if (deleteForEveryone) {
    if (!isAllOurs) {
      ToastUtils.pushMessageDeleteForbidden();
      window.inboxStore?.dispatch(resetSelectedMessageIds());
      return;
    }
    return unsendMessagesForEveryone(conversation, selectedMessages);
  }

  // delete just for me in a closed group only means delete locally
  if (conversation.isClosedGroup()) {
    await deleteMessagesFromSwarmAndCompletelyLocally(conversation, selectedMessages);

    // Update view and trigger update
    window.inboxStore?.dispatch(resetSelectedMessageIds());
    ToastUtils.pushDeleted(selectedMessages.length);
    return;
  }
  // otherwise, delete that message locally, from our swarm and from our other devices
  return unsendMessageJustForThisUser(conversation, selectedMessages);

  //#endregion
};

// tslint:disable-next-line: max-func-body-length
export async function deleteMessagesByIdForEveryone(
  messageIds: Array<string>,
  conversationId: string
) {
  const conversation = getConversationController().getOrThrow(conversationId);
  const selectedMessages = compact(
    await Promise.all(messageIds.map(m => getMessageById(m, false)))
  );

  const messageCount = selectedMessages.length;
  const moreThanOne = messageCount > 1;

  window.inboxStore?.dispatch(
    updateConfirmModal({
      title: window.i18n('deleteForEveryone'),
      message: moreThanOne
        ? window.i18n('deleteMessagesQuestion', [messageCount.toString()])
        : window.i18n('deleteMessageQuestion'),
      okText: window.i18n('deleteForEveryone'),
      okTheme: SessionButtonColor.Danger,
      onClickOk: async () => {
        await doDeleteSelectedMessages({ selectedMessages, conversation, deleteForEveryone: true });

        // explicity close modal for this case.
        window.inboxStore?.dispatch(updateConfirmModal(null));
        return;
      },
      closeAfterInput: false,
    })
  );
}

export async function deleteMessagesById(messageIds: Array<string>, conversationId: string) {
  const conversation = getConversationController().getOrThrow(conversationId);
  const selectedMessages = compact(
    await Promise.all(messageIds.map(m => getMessageById(m, false)))
  );

  const moreThanOne = selectedMessages.length > 1;

  window.inboxStore?.dispatch(
    updateConfirmModal({
      title: window.i18n('deleteJustForMe'),
      message: moreThanOne
        ? window.i18n('deleteMessagesQuestion')
        : window.i18n('deleteMessageQuestion'),
      okText: window.i18n('delete'),
      okTheme: SessionButtonColor.Danger,
      onClickOk: async () => {
        await doDeleteSelectedMessages({
          selectedMessages,
          conversation,
          deleteForEveryone: false,
        });
        window.inboxStore?.dispatch(updateConfirmModal(null));
      },
      closeAfterInput: false,
    })
  );
}

/**
 *
 * @param messages the list of MessageModel to delete
 * @param convo the conversation to delete from (only v2 opengroups are supported)
 */
async function deleteOpenGroupMessages(
  messages: Array<MessageModel>,
  convo: ConversationModel
): Promise<Array<string>> {
  if (!convo.isPublic()) {
    throw new Error('cannot delete public message on a non public groups');
  }

  if (!convo.isOpenGroupV2()) {
    throw new Error('Opengroupv1 are not supported anymore');
  }

  const roomInfos = convo.toOpenGroupV2();
  // on v2 servers we can only remove a single message per request..
  // so logic here is to delete each messages and get which one where not removed
  const validServerIdsToRemove = compact(
    messages.map(msg => {
      return msg.get('serverId');
    })
  );

  const validMessageModelsToRemove = compact(
    messages.map(msg => {
      const serverId = msg.get('serverId');
      if (serverId) {
        return msg;
      }
      return undefined;
    })
  );

  let allMessagesAreDeleted: boolean = false;
  if (validServerIdsToRemove.length) {
    allMessagesAreDeleted = await ApiV2.deleteMessageByServerIds(validServerIdsToRemove, roomInfos);
  }
  // remove only the messages we managed to remove on the server
  if (allMessagesAreDeleted) {
    window?.log?.info('Removed all those serverIds messages successfully');
    return validMessageModelsToRemove.map(m => m.id as string);
  } else {
    window?.log?.info(
      'failed to remove all those serverIds message. not removing them locally neither'
    );
    return [];
  }
}