connectNotificationServer.js

/**
 * This is TopCoder connect notification server.
 */
'use strict';

global.Promise = require('bluebird');

const config = require('./config');
const notificationServer = require('../index');
const _ = require('lodash');
const service = require('./service');
const { BUS_API_EVENT } = require('../src/constants')
const EVENTS = require('./events-config').EVENTS;
const TOPCODER_ROLE_RULES = require('./events-config').TOPCODER_ROLE_RULES;
const PROJECT_ROLE_RULES = require('./events-config').PROJECT_ROLE_RULES;
const PROJECT_ROLE_OWNER = require('./events-config').PROJECT_ROLE_OWNER;

/**
 * Get TopCoder members notifications
 *
 * @param  {Object} eventConfig event configuration
 *
 * @return {Promise}            resolves to a list of notifications
 */
const getTopCoderMembersNotifications = (eventConfig) => {
  // if event doesn't have to be notified to topcoder member, just ignore
  if (!eventConfig.topcoderRoles) {
    return Promise.resolve([]);
  }

  const getRoleMembersPromises = eventConfig.topcoderRoles.map(topcoderRole => (
    service.getRoleMembers(TOPCODER_ROLE_RULES[topcoderRole].id)
  ));

  return Promise.all(getRoleMembersPromises).then((membersPerRole) => {
    let notifications = [];

    eventConfig.topcoderRoles.forEach((topcoderRole, roleIndex) => {
      membersPerRole[roleIndex].forEach((memberId) => {
        notifications.push({
          userId: memberId.toString(),
          contents: {
            topcoderRole,
          },
        });
      });
    });

    // only one per userId
    notifications = _.uniqBy(notifications, 'userId');

    return notifications;
  });
};

/**
 * Get notifications for mentioned users
 *
 * @param  {Object} eventConfig event configuration
 * @param  {Object} message content
 *
 * @return {Promise}            resolves to a list of notifications
 */
const getNotificationsForMentionedUser = (eventConfig, content) => {
  if (!eventConfig.toMentionedUsers) {
    return Promise.resolve([]);
  }

  let notifications = [];
  // eslint-disable-next-line
  const regexUserHandle = /title=\"@([a-zA-Z0-9-_.{}\[\]]+)\"|\[.*\]\(.*\"\@(.*)\"\)/g;
  const handles = [];
  let matches = regexUserHandle.exec(content);
  while (matches) {
    const handle = matches[1] ? matches[1].toString() : matches[2].toString();
    notifications.push({
      userHandle: handle,
      newType: BUS_API_EVENT.CONNECT.MENTIONED_IN_POST,
      contents: {
        toUserHandle: true,
      },
    });
    matches = regexUserHandle.exec(content);
    handles.push(handle);
  }
  // only one per userHandle
  notifications = _.uniqBy(notifications, 'userHandle');

  return new Promise((resolve) => {
    service.getUsersByHandle(handles).then((users) => {
      _.map(notifications, (notification) => {
        notification.userId = _.find(users, { handle: notification.userHandle }).userId.toString();
      });
      resolve(notifications);
    });
  });
};

/**
 * Get project members notifications
 *
 * @param  {Object} eventConfig event configuration
 * @param  {Object} project     project details
 *
 * @return {Promise}            resolves to a list of notifications
 */
const getProjectMembersNotifications = (eventConfig, project) => {
  // if event doesn't have to be notified to project member, just ignore
  if (!eventConfig.projectRoles) {
    return Promise.resolve([]);
  }

  return new Promise((resolve) => {
    let notifications = [];
    const projectMembers = _.get(project, 'members', []);

    eventConfig.projectRoles.forEach(projectRole => {
      const roleNotifications = _.filter(projectMembers, PROJECT_ROLE_RULES[projectRole]).map((projectMember) => ({
        userId: projectMember.userId.toString(),
        contents: {
          projectRole,
        },
      }));

      // SPECIAL CASE for project owners
      // if we haven't found any project owner in project members list,
      // then treat any first member with isPrimary flag as an owner and send notification to him
      if (projectRole === PROJECT_ROLE_OWNER && roleNotifications.length < 1) {
        const ownerSubstituteMember = _.find(projectMembers, { isPrimary: true });

        // some member with isPrimary always suppose to exist, but check just in case
        if (ownerSubstituteMember) {
          roleNotifications.push({
            userId: ownerSubstituteMember.userId.toString(),
            contents: {
              projectRole,
            },
          });
        }
      }

      notifications = notifications.concat(roleNotifications);
    });

    // only one per userId
    notifications = _.uniqBy(notifications, 'userId');

    resolve(notifications);
  });
};

/**
 * Get notifications for users obtained from userId
 *
 * @param  {Object} eventConfig event configuration
 * @param  {String} userId  user id
 *
 * @return {Promise}            resolves to a list of notifications
 */
const getNotificationsForUserId = (eventConfig, userId) => {
  // if event doesn't have to be notified to provided userHandle, just ignore
  if (!eventConfig.toUserHandle) {
    return Promise.resolve([]);
  }

  // if we have to send notification to the userHandle,
  // but it's not provided in the message, then throw error
  if (!userId) {
    return Promise.reject(new Error('Missing userId in the event message.'));
  }

  return Promise.resolve([{
    userId: userId.toString(),
    contents: {
      toUserHandle: true,
    },
  }]);
};

/**
 * Get notifications for a user who started topic which was commented
 *
 * @param  {Object} eventConfig event configuration
 * @param  {String} topicId     topic id
 *
 * @return {Promise}            resolves to a list of notifications
 */
const getNotificationsForTopicStarter = (eventConfig, topicId) => {
  // if event doesn't have to be send to a topic starter, then skip
  if (!eventConfig.toTopicStarter) {
    return Promise.resolve([]);
  }

  // if we have to send notification to the topic starter
  // but topicId is not provided in the message, then throw error
  if (!topicId) {
    return Promise.reject(new Error('Missing topicId in the event message.'));
  }

  return service.getTopic(topicId).then((topic) => {
    const userId = topic.userId.toString();

    // special case: if topic created by CoderBot, don't send notification to him
    if (userId === 'CoderBot') {
      return [];
    }

    return [{
      userId,
      contents: {
        toTopicStarter: true,
      },
    }];
  });
};

/**
 * Exclude notifications using exclude rules of the event config
 *
 * @param {Array}  notifications notifications list
 * @param {Object} eventConfig   event configuration
 * @param {Object} message       message
 * @param {Object} data          any additional data which is retrieved once
 *
 * @returns {Promise} resolves to the list of filtered notifications
 */
const excludeNotifications = (notifications, eventConfig, message, data) => {
  // if there are no rules to exclude notifications, just return all of them untouched
  if (!eventConfig.exclude) {
    return Promise.resolve(notifications);
  }

  const { project } = data;
  // create event config using rules to exclude notifications
  const excludeEventConfig = Object.assign({
    type: eventConfig.type,
  }, eventConfig.exclude);

  // get notifications using rules for exclude notifications
  // and after filter out such notifications from the notifications list
  // TODO move this promise all together with `_.uniqBy` to one function
  //      and reuse it here and in `handler` function
  return Promise.all([
    getNotificationsForTopicStarter(excludeEventConfig, message.topicId),
    getNotificationsForUserId(excludeEventConfig, message.userId),
    getProjectMembersNotifications(excludeEventConfig, project),
    getTopCoderMembersNotifications(excludeEventConfig),
  ]).then((notificationsPerSource) => (
    _.uniqBy(_.flatten(notificationsPerSource), 'userId')
  )).then((excludedNotifications) => {
    const excludedUserIds = _.map(excludedNotifications, 'userId');
    const filteredNotifications = notifications.filter((notification) => (
      !_.includes(excludedUserIds, notification.userId)
    ));

    return filteredNotifications;
  });
};

// set configuration for the server, see ../config/default.js for available config parameters
// setConfig should be called before initDatabase and start functions
notificationServer.setConfig({ LOG_LEVEL: 'debug' });

// add topic handlers,
// handler is used build a notification list for a message of a topic,
// it is defined as: function(topic, message, callback),
// the topic is topic name,
// the message is JSON event message,
// the callback is function(error, userIds), where userIds is an array of user ids to receive notifications
const handler = (topic, message, callback) => {
  const projectId = message.projectId;
  if (!projectId) {
    return callback(new Error('Missing projectId in the event message.'));
  }

  const eventConfig = _.find(EVENTS, { type: topic });
  if (!eventConfig) {
    return callback(new Error(`Event type '${topic}' is not supported.`));
  }

  // filter out `notifications.connect.project.topic.created` events send by bot
  // because they create too much clutter and duplicate info
  if (topic === BUS_API_EVENT.CONNECT.TOPIC_CREATED && message.userId.toString() === config.TCWEBSERVICE_ID) {
    return callback(null, []);
  }

  // get project details
  service.getProject(projectId).then(project => {
    let allNotifications = [];

    Promise.all([
      // the order in this list defines the priority of notification for the SAME user
      // upper in this list - higher priority
      // NOTE: always add all handles here, they have to check by themselves:
      //       - if they have to handle particular event type or skip it
      //       - check that event has everything required or throw error
      getNotificationsForTopicStarter(eventConfig, message.topicId),
      getNotificationsForUserId(eventConfig, message.userId),
      message.postContent ? getNotificationsForMentionedUser(eventConfig, message.postContent) : Promise.resolve([]),
      getProjectMembersNotifications(eventConfig, project),
      getTopCoderMembersNotifications(eventConfig),
    ]).then((notificationsPerSource) => (
      // first found notification for one user will be send, the rest ignored
      // NOTE all userId has to be string
      _.uniqBy(_.flatten(notificationsPerSource), 'userId')
    )).then((notifications) => (
      excludeNotifications(notifications, eventConfig, message, {
        project,
      })
    )).then((notifications) => {
      allNotifications = _.filter(notifications, notification => notification.userId !== message.initiatorUserId);

      // now let's retrieve some additional data

      // if message has userId such messages will likely need userHandle and user full name
      // so let's get it
      if (message.userId) {
        const ids = [message.userId];
        return service.getUsersById(ids);
      }
      return [];
    }).then((users) => {
      _.map(allNotifications, (notification) => {
        notification.version = eventConfig.version;
        notification.contents.projectName = project.name;
        // if found a user then add user handle
        if (users.length) {
          notification.contents.userHandle = users[0].handle;
          notification.contents.userFullName = `${users[0].firstName} ${users[0].lastName}`;
          notification.contents.userEmail = users[0].email;
        }
      });
      callback(null, allNotifications);
    }).catch((err) => {
      callback(err);
    });
  }).catch((err) => {
    callback(err);
  });
};

// init all events
EVENTS.forEach(eventConfig => {
  notificationServer.addTopicHandler(eventConfig.type, handler);
});

// init database, it will clear and re-create all tables
notificationServer
  .initDatabase()
  .then(() => notificationServer.start())
  .catch((e) => console.log(e)); // eslint-disable-line no-console

// if no need to init database, then directly start the server:
// notificationServer.start();