Vulcan/packages/nova-notifications/lib/callbacks.js

import Users from 'meteor/nova:users';
import { addCallback } from 'meteor/nova:core';
import { createNotification } from './notifications.js';

// note: leverage weak dependencies on packages
const Comments = Package['nova:comments'] ? Package['nova:comments'].default : null;
const Posts = Package['nova:posts'] ? Package['nova:posts'].default : null;

if (!!Posts) {
  /**
   * @summary Add notification callback when a post is approved
   */
  const PostsApprovedNotification = (post) => {
    const notificationData = {
      post: _.pick(post, '_id', 'userId', 'title', 'url')
    };

    createNotification(post.userId, 'postApproved', notificationData);
  }
  addCallback("posts.approve.async", PostsApprovedNotification);
  
  /**
   * @summary Add new post notification callback on post submit
   */
  const PostsNewNotifications = (post) => {

    let adminIds = _.pluck(Users.adminUsers({fields: {_id:1}}), '_id');
    let notifiedUserIds = _.pluck(Users.find({'notifications_posts': true}, {fields: {_id:1}}).fetch(), '_id');
    
    const notificationData = {
      post: _.pick(post, '_id', 'userId', 'title', 'url', 'slug')
    };

    // remove post author ID from arrays
    adminIds = _.without(adminIds, post.userId);
    notifiedUserIds = _.without(notifiedUserIds, post.userId);

    if (post.status === Posts.config.STATUS_PENDING && !!adminIds.length) {
      // if post is pending, only notify admins
      createNotification(adminIds, 'newPendingPost', notificationData);
    } else if (!!notifiedUserIds.length) {
      // if post is approved, notify everybody
      createNotification(notifiedUserIds, 'newPost', notificationData);
    }
    
  }
  addCallback("posts.new.async", PostsNewNotifications);
}

if (!!Comments) {
  // add new comment notification callback on comment submit
  const CommentsNewNotifications = (comment) => {

    // note: dummy content has disableNotifications set to true
    if(Meteor.isServer && !comment.disableNotifications) {

      const post = Posts.findOne(comment.postId);
      const postAuthor = Users.findOne(post.userId);
      const notificationData = {
        comment: _.pick(comment, '_id', 'userId', 'author', 'htmlBody', 'postId'),
        post: _.pick(post, '_id', 'userId', 'title', 'url')
      };

      let userIdsNotified = [];

      // 1. Notify author of post (if they have new comment notifications turned on)
      //    but do not notify author of post if they're the ones posting the comment
      if (Users.getSetting(postAuthor, "notifications_comments", true) && comment.userId !== postAuthor._id) {
        createNotification(post.userId, 'newComment', notificationData);
        userIdsNotified.push(post.userId);
      }

      // 2. Notify author of comment being replied to
      if (!!comment.parentCommentId) {

        const parentComment = Comments.findOne(comment.parentCommentId);

        // do not notify author of parent comment if they're also post author or comment author
        // (someone could be replying to their own comment)
        if (parentComment.userId !== post.userId && parentComment.userId !== comment.userId) {

          const parentCommentAuthor = Users.findOne(parentComment.userId);

          // do not notify parent comment author if they have reply notifications turned off
          if (Users.getSetting(parentCommentAuthor, "notifications_replies", true)) {

            // add parent comment to notification data
            notificationData.parentComment = _.pick(parentComment, '_id', 'userId', 'author', 'htmlBody');

            createNotification(parentComment.userId, 'newReply', notificationData);
            userIdsNotified.push(parentComment.userId);
          }
        }

      }
      
    }
  }
  
  addCallback("comments.new.async", CommentsNewNotifications); 
}