util: in auth.js get rid of class, add createSocketAuthHash fn.

Author: narekhovhannisyan

lib/util/auth.js

@@ -8,53 +8,64 @@
 
 const crypto = require('crypto')
 
-class AuthUtil {
-  /**
-   * Creates keyed-hash message authentication code (HMAC).
-   *  Used core `crypto` module cryptographic hash function.
-   *  Secret key - sha512.
-   * @param {string} text
-   * @param {string} key
-   * @returns {string}
-   */
-  static createHMAC (text, key) {
-    return crypto.createHmac('sha512', key).update(text).digest('hex')
-  }
-
-  /**
-   * Generates HMAC based on source and key.
-   *  Source is defined as combination of clientId, path, qs, body, nonce and timestamp respectively.
-   * @param {{clientId, qs, path, body, nonce, timestamp}} options
-   * @param {string} key
-   * @returns {string}
-   */
-  static generateHash (options, key) {
-    const clientId = options.clientId
-    const qs = options.qs
-    const path = options.path
-    const body = options.body
-    const nonce = options.nonce
-    const timestamp = options.timestamp
-    const hashSource = `${clientId}${path}${qs}${body}${nonce}${timestamp}`
-
-    return AuthUtil.createHMAC(hashSource, key)
-  }
-
-  /**
-   * Generates nonce.
-   *  Creates timestamp
-   *  Gets the last 6 chars of the timestamp
-   *  Generates random number between 10-99
-   *  Combined the last two ones.
-   * @returns {string}
-   */
-  static generateNonce () {
-    const timestamp = Date.now().toString()
-    const str = timestamp.substring(timestamp.length - 6)
-    const suffix = Math.floor(Math.random() * 90 + 9)
-
-    return `${str}${suffix}`
-  }
+/**
+ * Creates keyed-hash message authentication code (HMAC).
+ *  Used core `crypto` module cryptographic hash function.
+ *  Secret key - sha512.
+ * @param {string} text
+ * @param {string} key
+ * @returns {string}
+ */
+const createHMAC = (text, key) => {
+  return crypto.createHmac('sha512', key).update(text).digest('hex')
+}
+
+/**
+ * Generates HMAC based on source and key.
+ *  Source is defined as combination of clientId, path, qs, body, nonce and timestamp respectively.
+ * @param {{clientId, qs, path, body, nonce, timestamp}} options
+ * @param {string} key
+ * @returns {string}
+ */
+const generateHash = (options, key) => {
+  const { clientId, qs, path, body, nonce, timestamp } = options
+  const hashSource = `${clientId}${path}${qs}${body}${nonce}${timestamp}`
+
+  return createHMAC(hashSource, key)
+}
+
+/**
+ * Generates nonce.
+ *  Creates timestamp
+ *  Gets the last 6 chars of the timestamp
+ *  Generates random number between 10-99
+ *  Combined the last two ones.
+ * @returns {string}
+ */
+const generateNonce = () => {
+  const timestamp = Date.now().toString()
+  const str = timestamp.substring(timestamp.length - 6)
+  const suffix = Math.floor(Math.random() * 90 + 9)
+
+  return `${str}${suffix}`
 }
 
-module.exports = AuthUtil
+/**
+ * Generates HMAC based on source and key.
+ *  Source is defined as combination of clientId, originalUrl, timestamp, signKey respectively.
+ * @param {{clientId, originalUrl, timestamp, signKey}} options
+ * @param {string} key
+ * @return {string}
+ */
+const createSocketAuthHash = (options, key) => {
+  const { clientId, originalUrl, timestamp } = options
+  const hashSource = `${clientId}${originalUrl}${timestamp}`
+
+  return createHMAC(hashSource, key)
+}
+
+module.exports = {
+  createSocketAuthHash,
+  generateHash,
+  generateNonce
+}