Refactor generate_auth_token

Author: Amir Tocker

lib/utils.js

@@ -6,9 +6,15 @@ crypto = require('crypto')
 config = require('./config')
 
 digest = (message, key) ->
-  crypto.createHmac("sha256", new Buffer(key, "hex"))
-    .update message
-    .digest 'hex'
+  crypto.createHmac("sha256", new Buffer(key, "hex")).update( message).digest('hex')
+
+###*
+  * Escape url using lowercase hex code
+  * @param {string} url a url string
+  * @return escaped url
+###
+escape_to_lower = (url) ->
+  encodeURIComponent(url).replace(/%../g, (match)-> match.toLowerCase())
 
 ###*
   * Generate an authorization token
@@ -23,25 +29,24 @@ digest = (message, key) ->
   * @returns {string} the authorization token
 ###
 module.exports = (options)->
-  params = Object.assign {}, config().auth_token, options
-  tokenName = params.token_name ? "__cld_token__"
+  tokenName = options.token_name ? "__cld_token__"
 
-  unless params.expiration?
-    if params.duration?
-      start = params.start_time ? Math.round(Date.now() / 1000)
-      params.expiration = start + params.duration
+  unless options.expiration?
+    if options.duration?
+      start = options.start_time ? Math.round(Date.now() / 1000)
+      options.expiration = start + options.duration
     else
       throw new Error( "Must provide either expiration or duration")
 
   tokenParts = []
-  tokenParts.push("ip=#{params.ip}") if params.ip?
-  tokenParts.push("st=#{params.start_time}") if params.start_time?
-  tokenParts.push("exp=#{params.expiration}")
-  tokenParts.push("acl=#{params.acl}") if params.acl?
+  tokenParts.push("ip=#{options.ip}") if options.ip?
+  tokenParts.push("st=#{options.start_time}") if options.start_time?
+  tokenParts.push("exp=#{options.expiration}")
+  tokenParts.push("acl=#{escape_to_lower(options.acl)}") if options.acl?
   toSign = (part for part in tokenParts)
-  if params.url
-    url = encodeURIComponent(params.url).replace(/%../g, (match)-> match.toLowerCase())
+  if options.url
+    url = escape_to_lower(options.url)
     toSign.push "url=#{url}"
-  auth = digest(toSign.join("~"), params.key)
+  auth = digest(toSign.join("~"), options.key)
   tokenParts.push("hmac=#{auth}")
   "#{tokenName}=#{tokenParts.join('~')}"

lib/utils.js.map

@@ -11,7 +11,11 @@ querystring = require('querystring')
 url = require('url')
 
 utils = exports
-exports.generate_auth_token = require("./auth_token")
+generate_token = require("./auth_token")
+exports.generate_auth_token = (options)->
+  token_options = Object.assign {}, config().auth_token, options
+  generate_token token_options
+
 exports.CF_SHARED_CDN = "d3jpl91pxevbkh.cloudfront.net"
 exports.OLD_AKAMAI_SHARED_CDN = "cloudinary-a.akamaihd.net"
 exports.AKAMAI_SHARED_CDN = "res.cloudinary.com"
@@ -396,7 +400,9 @@ exports.url = (public_id, options = {}) ->
   api_secret = utils.option_consume(options, "api_secret", config().api_secret)
   url_suffix = utils.option_consume(options, "url_suffix")
   use_root_path = utils.option_consume(options, "use_root_path", config().use_root_path)
-  auth_token = if options.auth_token == false then false else exports.merge config().auth_token, utils.option_consume(options, "auth_token")
+  auth_token = utils.option_consume(options, "auth_token")
+  if auth_token != false
+    auth_token = exports.merge config().auth_token, auth_token
 
   preloaded = /^(image|raw)\/([a-z0-9_]+)\/v(\d+)\/([^#]+)$/.exec(public_id)
   if preloaded
@@ -436,7 +442,8 @@ exports.url = (public_id, options = {}) ->
   resultUrl = [prefix, resource_type, type, signature, transformation, version,
     public_id].filter((part) -> part? && part != '').join('/')
   if sign_url && !_.isEmpty(auth_token)
-    token = utils.generate_auth_token exports.merge(url: url.parse(resultUrl).path, auth_token)
+    auth_token.url = url.parse(resultUrl).path
+    token = generate_token( auth_token)
     resultUrl += "?#{token}"
   resultUrl
 

src/auth_token.coffee

@@ -19,7 +19,7 @@ describe "authToken", ->
 
   it "should generate with start and window",  ->
     token = utils.generate_auth_token start_time: 1111111111, acl: "/image/*", duration: 300
-    expect(token).to.eql '__cld_token__=st=1111111111~exp=1111111411~acl=/image/*~hmac=0854e8b6b6a46471a80b2dc28c69bd352d977a67d031755cc6f3486c121b43af'
+    expect(token).to.eql "__cld_token__=st=1111111111~exp=1111111411~acl=%2fimage%2f*~hmac=1751370bcc6cfe9e03f30dd1a9722ba0f2cdca283fa3e6df3342a00a7528cc51"
 
   describe "authenticated url", ->
     beforeEach ->
@@ -56,7 +56,7 @@ describe "authToken", ->
       tokenOptions = {key: KEY, duration: 300, acl: "/*/t_#{user}"}
       tokenOptions.start_time = 222222222 # we can't rely on the default "now" value in tests
       cookieToken = utils.generate_auth_token tokenOptions
-      expect(cookieToken).to.eql("__cld_token__=st=222222222~exp=222222522~acl=/*/t_foobar~hmac=eb5e2266c8ec9573f696025f075b92998080347e1c12ac39a26c94d7d712704a")
+      expect(cookieToken).to.eql("__cld_token__=st=222222222~exp=222222522~acl=%2f*%2ft_foobar~hmac=8e39600cc18cec339b21fe2b05fcb64b98de373355f8ce732c35710d8b10259f")
 
   it "should add token to an image tag url", ->
     tag = cloudinary.image "sample.jpg", sign_url: true, type: "authenticated", version: "1486020273"