Implemented api for searching lists that have parameter email as a subscriber

lib/models/lists.js

@@ -4,6 +4,7 @@ let db = require('../db');
 let tools = require('../tools');
 let shortid = require('shortid');
 let segments = require('./segments');
+let subscriptions = require('./subscriptions');
 let _ = require('../translate')._;
 let tableHelpers = require('../table-helpers');
 
@@ -64,6 +65,34 @@ module.exports.quicklist = callback => {
     });
 };
 
+module.exports.getListsWithEmail = (email, callback) => {
+    db.getConnection((err, connection) => {
+        if (err) {
+            return callback(err);
+        }
+
+        connection.query('SELECT id, name FROM lists', (err, rows) => {
+            connection.release();
+            if (err) {
+                return callback(err);
+            }
+
+            let lists = (rows || []).map(tools.convertKeys);
+            const results = [];
+            lists.forEach((list, index, arr) => {
+                subscriptions.getByEmail(list.id, email, (err, sub) => {
+                    if (sub) {
+                        results.push(list.id);
+                    }
+                    if (index === arr.length - 1) {
+                        callback(null, lists.filter(list => results.includes(list.id)));
+                    }
+                });
+            });
+        });
+    });
+}
+
 module.exports.getByCid = (cid, callback) => {
     resolveCid(cid, (err, id) => {
         if (err) {