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The `#csrf_meta_tags` and `#token_tag` Action View helper methods are expecting the class in which are included to explicitly define the method `#protect_against_forgery?` or else they will fail with `NoMethodError`. This is a problem if you want to use Action View outside of Rails applications. For example, in #34788 I used the `#button_to` helper inside of the error pages templates that have a custom `ActionView::Base` subclass, which did not defined `#protect_against_forgery?` and trying to call the button failed. I had to dig inside of Action View to find-out what's was going on. I think we should either set a default method implementation in the helpers or check for the method definition, but don't explicitly require the presence of `#protect_against_forgery?` in every `ActionViews::Base` subclass as the errors are hard to figure out.
35 lines
1.2 KiB
Ruby
35 lines
1.2 KiB
Ruby
# frozen_string_literal: true
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module ActionView
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# = Action View CSRF Helper
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module Helpers #:nodoc:
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module CsrfHelper
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# Returns meta tags "csrf-param" and "csrf-token" with the name of the cross-site
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# request forgery protection parameter and token, respectively.
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#
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# <head>
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# <%= csrf_meta_tags %>
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# </head>
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#
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# These are used to generate the dynamic forms that implement non-remote links with
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# <tt>:method</tt>.
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#
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# You don't need to use these tags for regular forms as they generate their own hidden fields.
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#
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# For AJAX requests other than GETs, extract the "csrf-token" from the meta-tag and send as the
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# "X-CSRF-Token" HTTP header. If you are using rails-ujs this happens automatically.
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#
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def csrf_meta_tags
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if defined?(protect_against_forgery?) && protect_against_forgery?
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[
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tag("meta", name: "csrf-param", content: request_forgery_protection_token),
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tag("meta", name: "csrf-token", content: form_authenticity_token)
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].join("\n").html_safe
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end
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end
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# For backwards compatibility.
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alias csrf_meta_tag csrf_meta_tags
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end
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end
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end
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