auth: add socket authorization functionality.

 - add `createSocketAuthorizationString` function
 - add `createAuthorizationQuery` function

Author: narekhovhannisyan

lib/auth.js

@@ -10,11 +10,10 @@ const url = require('url')
 
 const AuthUtil = require('./util/auth')
 
+const { SOCKET_ORIGINAL_URL } = require('./config')
+
 /**
- * Set Authorization.
- * @param {Object} options
- * @param {string} signKey
- * @param {number} clientId
+ * Set Authorization for api requests.
  */
 const setAuthorization = (options, signKey, clientId) => {
   const { path, query } = url.parse(options.uri)
@@ -35,6 +34,28 @@ const setAuthorization = (options, signKey, clientId) => {
   options.headers = Object.assign({}, options.headers, headers)
 }
 
+/**
+ * Builds authorization string for socket connection.
+ * @return {String}
+ */
+const createSocketAuthorizationString = (clientId, signKey, timestamp) => AuthUtil.createSocketAuthHash({
+  clientId,
+  timestamp,
+  originalUrl: SOCKET_ORIGINAL_URL
+}, signKey)
+
+/**
+ * Creates authorization query based on auth, clientId and timestamp.
+ * @return {String}
+ */
+const createAuthorizationQuery = (clientId, signKey) => {
+  const timestamp = Date.now()
+  const auth = createSocketAuthorizationString(clientId, signKey, timestamp)
+
+  return `authorization=${auth}&user_id=${clientId}&timestamp=${timestamp}`
+}
+
 module.exports = {
+  createAuthorizationQuery,
   setAuthorization
 }