Guide on creating a JSONP request

My goal is to perform cross-site scripting. The code snippet below shows the jsonp method, which appears to fail initially but succeeds when switched to a get request. I am trying to achieve a successful response using the jsonp method. I have confirmed that the response is valid json and includes the parameter in the URL ?callback=JSON_CALLBACK. Here's the json data received from the HTTP request and the corresponding code block.

HTTP response status code 200

[{"cube":"1" ,"points":"160"},{"cube":"2","points":"690"},{"cube":"3","points":"331"}]

Code Block:

 var myApp = angular.module('test', []);

    myApp.controller('UserCtrl', function($scope, users) {
        $scope.usersPerCube = users.getUsers();
    })

    myApp.factory('users', function($http) {
       return {
         getUsers: function() {
           var deferred = $q.defer();
           var url = "http://localhost/api/api/index.php/analytics/UsersPerCube?callback=JSON_CALLBACK";
         $http.get(url).success(function (data, status, headers, config) {
                console.log(data);
                deferred.resolve(data);
            }).error(function (data, status, headers, config) {
                //this always gets called
                console.log(status);
                deferred.reject(status);
            });
            return deferred.promise;

     }
   }

I have updated my server-side code and now receive:

"angular.callbacks._1( {"cube":"1","points":"160"},{"cube":"2","points":"690"},{"cube":"3","points":"331"})"

UPDATE: The above changes are successful and the success method is now executing. I'm currently working on parsing the objects and will update again once I find a solution.

Answer №1

If you're encountering issues with performing a jsonp request, I've taken the time to outline a detailed description of how to navigate through it successfully. This way, others can avoid running into the same troubles that I faced.

myApp.factory('users', function($http) {
       return {
         getUsers: function() {
           var deferred = $q.defer();
           var url = "http://localhost/api/api/index.php/analytics/UsersPerCube?callback=JSON_CALLBACK";
         $http.get(url).success(function (data, status, headers, config) {
                console.log(data);
                deferred.resolve(data);
            }).error(function (data, status, headers, config) {
                //this always gets called
                console.log(status);
                deferred.reject(status);
            });
            return deferred.promise;

     }  

Take note that the URL includes ?callback=JSON_CALLBACK. Here is a helpful stackoverflow post discussing this. Once you receive the response, it will be in the form of JSON structured as shown below.

"angular.callbacks._1( {"cube":"1","points":"160"},{"cube":"2","points":"690"},{"cube":"3","points":"331"})"

Another enlightening stackoverflow thread on the topic.

One crucial aspect that threw me off was ensuring that the server returns the `GET` parameter, `callback`. You can refer to this informative tutorial: . The resulting JSON structure should resemble the example provided above.

I sincerely hope this guide proves useful for someone facing similar challenges in the future.

Answer №2

If you are looking to send multiple JSONP requests using the $http service, there is a simple trick you can use. Angular alters the JSON_CALLBACK to an internal value, so the best approach is to include the following JavaScript code in your returned js file:

var callbackId = '_' + (angular.callbacks.counter - 1).toString(36);
angular.callbacks[callbackId](/* INSERT YOUR JSON HERE */);

To ensure that this method works effectively, it is recommended to review the createHttpBackend function in the angular sources.

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