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Content security policies for custom modules can be added by setting up a csp_whitelist.xml file, i.e. app/code/Vendorname/Modulename/etc/cps_whitelist.xml, this is more or less excessively described in the docs.

However, the docs also mention

Configure CSPs for your custom code/extension/theme

Yet, I seem to be unable to get a working whitelist addition from within a custom theme, i.e. app/design/Vendorname/Themename/etc/cps_whitelist.xml?

etc/csp_whitelist.xml:

<?xml version="1.0" encoding="UTF-8"?>
<csp_whitelist xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Csp:etc/csp_whitelist.xsd">
    <policies>
        <policy id="style-src">
            <values>
                <value id="fontsGoogleapisCom" type="host">fonts.googleapis.com</value>
            </values>
        </policy>
    </policies>
</csp_whitelist>

This very same whitelist is working and brings me the expected result when moved to a custom module (i.e. app/code/Vendorname/ThemenameCsp).

Am I supposed to create a custom-theme-related custom module just to allow my custom theme to load an external font? Seems a bit nasty to me if that's actually the case.

1 Answer 1

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Unless one may come up with a better solution, this is my workaround:

As it looks, we can just extend the theme's registration.php to register as a theme and as module (?!) to something like this:

<?php
use \Magento\Framework\Component\ComponentRegistrar;

ComponentRegistrar::register(ComponentRegistrar::THEME, 'frontend/Vendorname/Themename', __DIR__);
ComponentRegistrar::register(ComponentRegistrar::MODULE, 'Vendorname_Themename', __DIR__);

Now, once a etc/module.xml is in place we also can add a csp_whitelist.xml with the very same content as mentioned in the question above.

Note: As I am not sure whether this is the indented way to go I'll keep the question unanswered for the time being.

1
  • interesting solution - I like your thinking...
    – paj
    Commented Feb 1, 2021 at 10:12

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