Utilize JavaScript to include HTTP headers in image requests

Question

Utilize JavaScript to include HTTP headers in image requests

In my JS/HTML5 Project with angularjs, I have implemented protection for my API by setting an authorization token in the HTTP header. Now, I am also looking to secure access to images stored on the server.

While I know how to accomplish this on the server side, I am unsure how to add HTTP headers to image requests in angular or JavaScript. We have successfully added the headers to API requests within our services ($resource), but I am seeking guidance on how to do the same for image requests.

javascript angularjs

Answer 1

Answer №1

In Angular 1.2.X

In the realm of Angular 1.2, there exist numerous methods to achieve this task. To streamline the process in Angular 1.2, I suggest utilizing an http interceptor to sanitize outgoing requests and append headers.

// Implementing an interceptor as a service.
app.factory('myInterceptor', function($q) {
  return {
    // Intercepting requests on their way out.
    request: function(config) {
      var myDomain = "http://whatever.com";

      // (optional) If the request is directed towards your target domain,
      // THEN include your header, otherwise leave it as is.
      if(config.url.indexOf(myDomain) !== -1) {
        // Add the Authorization header (or custom header) here.
        config.headers.Authorization = "Token 12309123019238";
      }

      return config;
    }
  }
});

app.config(function($httpProvider) {
  // Link the interceptor by name in the configuration.
  $httpProvider.interceptors.push('myInterceptor');
});

In Angular 1.0.X

If working with Angular 1.0.X, you will have to set the headers more globally in the common headers...

$http.defaults.headers.common.Authentication

EDIT: Dealing with

To achieve this, you will have to craft a directive, and things might get a bit complex.

You will need to:

Create a directive that is attached to your <img/> tag, or generates it.
Ensure that the directive utilizes the $http service to request the image (thus utilizing the aforementioned http interceptor). You will have to analyze the extension and set the appropriate content-type header, for instance:
```
$http({ url: 'images/foo.jpg', headers: { 'content-type': 'image/jpeg' }).then(...)
```
Upon receiving the response, you must extract the raw base64 data and assign it to the src attribute of your image element as a data source like this:
```
<img src="data:image/jpeg;base64,9hsjadf9ha9s8dfh...asdfasfd"/>
```
.

... this process may become intricate.

It would be advantageous if your server does not secure the images.

Answer 2

In Angular 1.2.X

In the realm of Angular 1.2, there exist numerous methods to achieve this task. To streamline the process in Angular 1.2, I suggest utilizing an http interceptor to sanitize outgoing requests and append headers.

// Implementing an interceptor as a service.
app.factory('myInterceptor', function($q) {
  return {
    // Intercepting requests on their way out.
    request: function(config) {
      var myDomain = "http://whatever.com";

      // (optional) If the request is directed towards your target domain,
      // THEN include your header, otherwise leave it as is.
      if(config.url.indexOf(myDomain) !== -1) {
        // Add the Authorization header (or custom header) here.
        config.headers.Authorization = "Token 12309123019238";
      }

      return config;
    }
  }
});

app.config(function($httpProvider) {
  // Link the interceptor by name in the configuration.
  $httpProvider.interceptors.push('myInterceptor');
});

In Angular 1.0.X

If working with Angular 1.0.X, you will have to set the headers more globally in the common headers...

$http.defaults.headers.common.Authentication

EDIT: Dealing with

To achieve this, you will have to craft a directive, and things might get a bit complex.

You will need to:

Create a directive that is attached to your <img/> tag, or generates it.
Ensure that the directive utilizes the $http service to request the image (thus utilizing the aforementioned http interceptor). You will have to analyze the extension and set the appropriate content-type header, for instance:
```
$http({ url: 'images/foo.jpg', headers: { 'content-type': 'image/jpeg' }).then(...)
```
Upon receiving the response, you must extract the raw base64 data and assign it to the src attribute of your image element as a data source like this:
```
<img src="data:image/jpeg;base64,9hsjadf9ha9s8dfh...asdfasfd"/>
```
.

... this process may become intricate.

It would be advantageous if your server does not secure the images.

Answer 3

Answer №2

As mentioned in this post, you have the option to utilize angular-img-http-src (

bower install --save angular-img-http-src

if you are using Bower).

Upon reviewing the provided code, it makes use of URL.createObjectURL and URL.revokeObjectURL which are still in draft status as of April 19, 2016. It is advisable to check if your browser supports these features.

To make use of this functionality, you must declare 'angular.img' as a dependency in your app module (

angular.module('myapp', [..., 'angular.img'])

), and then in your HTML, you can utilize the http-src attribute for the <img> tag.

For instance:

<img http-src="{{myDynamicImageUrl}}">

Of course, this assumes that you have implemented an interceptor using $httpProvider.interceptors.push to include your custom header, or that you have statically set your header for all requests using

$http.defaults.headers.common.MyHeader = 'some value';

Answer 4

As mentioned in this post, you have the option to utilize angular-img-http-src (

bower install --save angular-img-http-src

if you are using Bower).

Upon reviewing the provided code, it makes use of URL.createObjectURL and URL.revokeObjectURL which are still in draft status as of April 19, 2016. It is advisable to check if your browser supports these features.

To make use of this functionality, you must declare 'angular.img' as a dependency in your app module (

angular.module('myapp', [..., 'angular.img'])

), and then in your HTML, you can utilize the http-src attribute for the <img> tag.

For instance:

<img http-src="{{myDynamicImageUrl}}">

Of course, this assumes that you have implemented an interceptor using $httpProvider.interceptors.push to include your custom header, or that you have statically set your header for all requests using

$http.defaults.headers.common.MyHeader = 'some value';

Answer 5

Answer №3

After encountering a similar issue, we implemented a custom ng-src directive to resolve it.

Our solution involved creating a secure-src directive that functions similarly to ng-src, with the added feature of appending a query parameter containing the local authentication header to the URL.

In addition to checking the header, the server-side code serving the resources was updated to validate the query parameters. The authentication process for the token included in the query parameter may vary slightly, such as allowing a time window after a normal REST request for such a request to be accepted, considering that the URL can be stored in the browser history.

Answer 6

After encountering a similar issue, we implemented a custom ng-src directive to resolve it.

Our solution involved creating a secure-src directive that functions similarly to ng-src, with the added feature of appending a query parameter containing the local authentication header to the URL.

In addition to checking the header, the server-side code serving the resources was updated to validate the query parameters. The authentication process for the token included in the query parameter may vary slightly, such as allowing a time window after a normal REST request for such a request to be accepted, considering that the URL can be stored in the browser history.

Answer 7

Answer №4

Quoted directly from the official documentation found at: http://docs.angularjs.org/api/ngResource/service/ $resource

How to Use

$resource(url, [paramDefaults], [actions]);

[...]

actions: Collection with defined custom actions to enhance the default resource actions. The layout should follow $http.config format:

{action1: {method:?, params:?, isArray:?, headers:?, ...},
action2: {method:?, params:?, isArray:?, headers:?, ...}, ...}

For more information on the $http service:

http://docs.angularjs.org/api/ng/service/$http#usage_parameters

Answer 8

Quoted directly from the official documentation found at: http://docs.angularjs.org/api/ngResource/service/ $resource

How to Use

$resource(url, [paramDefaults], [actions]);

[...]

actions: Collection with defined custom actions to enhance the default resource actions. The layout should follow $http.config format:

{action1: {method:?, params:?, isArray:?, headers:?, ...},
action2: {method:?, params:?, isArray:?, headers:?, ...}, ...}

For more information on the $http service:

http://docs.angularjs.org/api/ng/service/$http#usage_parameters

Answer 9

Answer №5

It has been noted here that Firefox has support for the httpChannel.setRequestHeader method:

// Adding a "X-Hello: World" header to the request
httpChannel.setRequestHeader("X-Hello", "World", false);

The code example above showcases a variable called httpChannel which refers to an object that implements nsIHttpChannel. (The variable could technically have any name.)

The setRequestHeader method requires 3 parameters. The first one is the name of the HTTP request header. The second one is the value of the HTTP request header. And for now, the third parameter can be set to false in all cases.

However, this feature appears to be exclusive to Firefox as highlighted in this source.

Alternatives include using Cookies for value passing and retrieval as a cookie instead of an HttpHeader, or utilizing ajax to access images with a custom header.

For further information, check out these additional sources:

Resource 1
Resource 2

Answer 10

It has been noted here that Firefox has support for the httpChannel.setRequestHeader method:

// Adding a "X-Hello: World" header to the request
httpChannel.setRequestHeader("X-Hello", "World", false);

The code example above showcases a variable called httpChannel which refers to an object that implements nsIHttpChannel. (The variable could technically have any name.)

The setRequestHeader method requires 3 parameters. The first one is the name of the HTTP request header. The second one is the value of the HTTP request header. And for now, the third parameter can be set to false in all cases.

However, this feature appears to be exclusive to Firefox as highlighted in this source.

Alternatives include using Cookies for value passing and retrieval as a cookie instead of an HttpHeader, or utilizing ajax to access images with a custom header.

For further information, check out these additional sources:

Resource 1
Resource 2

Utilize JavaScript to include HTTP headers in image requests

Answer №1

In Angular 1.2.X

In Angular 1.0.X

EDIT: Dealing with

Answer №2

Answer №3

Answer №4

Answer №5

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