Book Image

CORS Essentials

By : Rajesh Gunasundaram
Book Image

CORS Essentials

By: Rajesh Gunasundaram

Overview of this book

This book explains how to use CORS, including specific implementations for platforms such as Drupal, WordPress, IIS Server, ASP.NET, JBoss, Windows Azure, and Salesforce, as well as how to use CORS in the Cloud on Amazon AWS, YouTube, Mulesoft, and others. It examines limitations, security risks, and alternatives to CORS. It explores the W3C Specification and major developer documentation sources about CORS. It attempts to predict what kinds of extension to the CORS specification, or completely new techniques, will come in the future to address the limitations of CORS Web developers will learn how to share code and assets across domains with CORS. They will learn a variety of techniques that are rather similar in their method and syntax. The book is organized by similar types of framework and application, so it can be used as a reference. Developers will learn about special cases, such as when a proxy is necessary. And they will learn about some alternative techniques that achieve similar goals, and when they may be preferable to using CORS

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CORS Essentials
Rajesh Gunasundaram
May, 2017 | 144 pages
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Table of Contents (15 chapters)
CORS Essentials
CORS Essentials
Credits
Credits
About the Authors
About the Authors
www.PacktPub.com
www.PacktPub.com
Customer Feedback
Customer Feedback
Preface
Preface
Free Chapter
1
Why You Need CORS
Why You Need CORS
The same-origin policy
Considering the origin of entities
Commonly allowed cross-origin resource sharing
Permissions required by JavaScript
How CORS works – the header and the request
CORS with Preflight
Troubleshooting and debugging CORS
CORS with jQuery
Enabling CORS globally with server configuration
Alternatives to CORS
Summary
2
Creating Proxies for CORS
Creating Proxies for CORS
Proxies and the World Wide Web
What is a proxy server?
Reasons to use a proxy
Creating a proxy server with Google App Engine
Summary
3
Usability and Security
Usability and Security
CORS usability
Enhancing security in CORS
Summary
4
CORS in Popular Content Management Frameworks
CORS in Popular Content Management Frameworks
Incoming CORS requests
SAAS or self-hosted?
CORS in WordPress
CORS in Drupal
CORS in Joomla!
CORS in Adobe Experience Manager
Summary
5
CORS in Windows
CORS in Windows
Incoming CORS requests
How to set the Access-Control-Allow-Origin header globally in Windows IIS Server
CORS in the ASP.NET Web API
CORS in Windows Communication Foundation
CORS in Windows browsers – Internet Explorer and Edge
Summary
6
CORS in the Cloud
CORS in the Cloud
CORS requests in cloud APIs
CORS in Amazon Simple Storage Service (S3)
Using CORS in Google Cloud Storage
Authenticated access to Google APIs with CORS
CORS in IBM Cloudant
CORS in Windows Azure Storage
CORS in Box API
CORS in the Dropbox API
Summary
References
7
CORS in Node.js
CORS in Node.js
JavaScript frameworks are very popular
Introduction to Node.js
JavaScript frameworks that work with Node.js
CORS in Express.js
CORS npm for Express.js using Connect.js middleware
CORS in AngularJS
CORS in Backbone.js
Node.js and JavaScript frameworks are evolving rapidly
Summary
References
8
CORS Best Practices
CORS Best Practices
Enabling API to public CORS requests
Limiting API to allow CORS requests to a whitelisted set of origins
Protecting against cross-site request forgery (CSRF)
Summary
Index
Index

CORS in Adobe Experience Manager

While the previous sections examined using CORS in frameworks built with PHP, Adobe Experience Manager is built with Java.

Tip

In 2013, Adobe systems renamed the Adobe CQ WCM to Adobe Experience Manager (also known as Adobe AEM or just AEM).

AEM has a Java package for CORS. Another option is to allow domains to post to Sling in the CRX console; when domains are trusted this way, CORS is unnecessary. In some cases, such as when using Scene 7, CORS headers may need to be added with rulesets.

The com.adobe.cq.social.commons.cors package

AEM includes a package named com.adobe.cq.social.commons.cors. The package contains four classes:

Classes in com.adobe.cq.social.commons.cors

Description

CORSAuthenticationFilter

Adds CORS headers to HTTP responses

CORSAuthInfoPostProcessor

CORS authentication post processor

CORSConfig

Singleton configuration holder so that both the CORS filter and CORS post processor have access to the system settings

CORSConstants

CORS...

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