mastodon/config/initializers/content_security_policy.rb

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# Define an application-wide content security policy
# For further information see the following documentation
# https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy
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if Rails.env.production?
assets_host = Rails.configuration.action_controller.asset_host || "https://#{ENV['WEB_DOMAIN'] || ENV['LOCAL_DOMAIN']}"
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Rails.application.config.content_security_policy do |p|
p.base_uri :none
p.default_src :none
p.frame_ancestors :none
p.script_src :self, assets_host
p.font_src :self, assets_host
p.img_src :self, :https, :data, :blob
p.style_src :self, :unsafe_inline, assets_host
p.media_src :self, :data, assets_host
p.frame_src :self, :https
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p.connect_src :self, :blob, assets_host, Rails.configuration.x.streaming_api_base_url
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end
end
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# Report CSP violations to a specified URI
# For further information see the following documentation:
# https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy-Report-Only
# Rails.application.config.content_security_policy_report_only = true