Add the ability to prevent URLs from being added to the buffer

mbrio · mbrio · commit 01fa78f86695 · 2013-03-18T14:19:07.000-04:00
diff --git a/src/angular-http-auth.js b/src/angular-http-auth.js
@@ -1,78 +1,117 @@
+/*global angular:true, browser:true */
+
 /**
  * @license HTTP Auth Interceptor Module for AngularJS
  * (c) 2012 Witold Szczerba
  * License: MIT
  */
 angular.module('http-auth-interceptor', [])
 
-  .provider('authService', function() {
+  .provider('authService', function () {
     /**
      * Holds all the requests which failed due to 401 response,
      * so they can be re-requested in future, once login is completed.
      */
     var buffer = [];
-    
+
+    /**
+     * Holds a list of functions that define rules for ignoring
+     * the addition of requests to the buffer.
+     */
+    var ignoreUrlExpressions = [];
+
+    /**
+     * Adds functions to the `ignoreUrlExpressions` array.
+     * The fn function takes a URL as a response as an argument and returns
+     * `true` (to ignore the URL) or `false` (to allow the URL). When `true` is
+     * returned no other expressions will be tested.
+     */
+    this.addIgnoreUrlExpression = function (fn) {
+      if (angular.isFunction(fn)) { ignoreUrlExpressions.push(fn); }
+    };
+
+    /**
+     * Executes each of the ignore expressions to determine whether the URL
+     * should be ignored.
+     */
+    this.shouldIgnoreUrl = function (response) {
+      var fn, i, j = ignoreUrlExpressions.length;
+
+      for (i = 0; i < j; i++) {
+        fn = ignoreUrlExpressions[i];
+        if (fn(response) === true) { return true; }
+      }
+
+      return false;
+    };
+
     /**
      * Required by HTTP interceptor.
      * Function is attached to provider to be invisible for regular users of this service.
      */
-    this.pushToBuffer = function(config, deferred) {
+    this.pushToBuffer = function (config, deferred) {
       buffer.push({
-        config: config, 
+        config: config,
         deferred: deferred
       });
-    }
-    
-    this.$get = ['$rootScope','$injector', function($rootScope, $injector) {
+    };
+
+    this.$get = ['$rootScope', '$injector', function ($rootScope, $injector) {
       var $http; //initialized later because of circular dependency problem
       function retry(config, deferred) {
         $http = $http || $injector.get('$http');
-        $http(config).then(function(response) {
+        $http(config).then(function (response) {
           deferred.resolve(response);
         });
       }
       function retryAll() {
-        for (var i = 0; i < buffer.length; ++i) {
+        var i;
+
+        for (i = 0; i < buffer.length; ++i) {
           retry(buffer[i].config, buffer[i].deferred);
         }
         buffer = [];
       }
 
       return {
-        loginConfirmed: function() {
+        loginConfirmed: function () {
           $rootScope.$broadcast('event:auth-loginConfirmed');
           retryAll();
         }
-      }
-    }]
+      };
+    }];
   })
 
   /**
    * $http interceptor.
    * On 401 response - it stores the request and broadcasts 'event:angular-auth-loginRequired'.
    */
-  .config(['$httpProvider', 'authServiceProvider', function($httpProvider, authServiceProvider) {
-    
-    var interceptor = ['$rootScope', '$q', function($rootScope, $q) {
+  .config(['$httpProvider', 'authServiceProvider', function ($httpProvider, authServiceProvider) {
+
+    var interceptor = ['$rootScope', '$q', function ($rootScope, $q) {
       function success(response) {
         return response;
       }
- 
+
       function error(response) {
         if (response.status === 401) {
           var deferred = $q.defer();
-          authServiceProvider.pushToBuffer(response.config, deferred);
+
+          if (!authServiceProvider.shouldIgnoreUrl(response)) {
+            authServiceProvider.pushToBuffer(response.config, deferred);
+          }
+
           $rootScope.$broadcast('event:auth-loginRequired');
           return deferred.promise;
         }
         // otherwise
         return $q.reject(response);
       }
- 
-      return function(promise) {
+
+      return function (promise) {
         return promise.then(success, error);
-      }
- 
+      };
+
     }];
     $httpProvider.responseInterceptors.push(interceptor);
   }]);
