When utilizing the AWS JavaScript SDK, the request header is missing the HTTP_X_CSRF_TOKEN

In my Rails application, I have implemented a feature that allows users to post answers to questions via ajax. Everything was working fine until I decided to incorporate the aws-js-sdk script in order to enable image uploads within the answer input field. The images are uploaded to S3 and the URL of the uploaded image is returned in a callback function, after which I save the answer.

The library was added to the application using the following code snippet:

<%= javascript_include_tag "//sdk.amazonaws.com/js/aws-sdk-2.1.12.min.js" %>

Expected behavior: When submitting an answer with an image, the request header should contain HTTP_X_CSRF_TOKEN to validate that the form submission originated from within the website.

Issue: However, the request header does not include HTTP_X_CSRF_TOKEN, resulting in the error message 

ActionController::InvalidAuthenticityToken
.

javascriptruby-on-railsajaxamazon-web-servicesaws-sdk

Answer №1

The token used for authentication is not located in the header of the page. Instead, it is placed as a hidden field within the form tag. Here's an example:

<form class="edit_user" id="edit_user_6" action="/users/6/set_facilitator" accept-charset="UTF-8" data-remote="true" method="post">
  <input name="utf8" type="hidden" value="✓">
  <input type="hidden" name="_method" value="patch">
  <input type="hidden" name="authenticity_token" value="yrr7gWaLmE8ul4s0JcNmAU6H0YB+c7YR/8yCE7it+cRlG9lfdejTSFT7bhydWEQPSqv2E7gVPQ++9mvfJDfJeA==">
  <select class="form-control" data-submit="true" name="user[facilitator_id]" id="user_facilitator_id">

When submitting the form via AJAX, the authenticity_token gets sent along as a parameter.

  Parameters: {"utf8"=>"√", "authenticity_token"=>"vcvY+cRQC0oM99l5+BFHu6GShPAedugTP1jRqXCxRa3bVGFLjLSVbMFk78aR5N0ol1WOu1noAo/GF6B67PSk6Q==", ...}

If the S3 gem interacts directly with Amazon, it will not utilize authenticity tokens. This is because Amazon does not have access to your Rails app's secret key on your server. To determine if the S3 gem generates a separate form outside of your primary form or embeds a nested <form>, which would be invalid HTML, examine the generated HTML code.

To disable token checks in your controller, you can add this line:

protect_from_forgery :except => :action_method

For more information, refer to the documentation here: http://guides.rubyonrails.org/v5.0/working_with_javascript_in_rails.html#form-for and here http://guides.rubyonrails.org/v5.0/security.html#csrf-countermeasures

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