discourse/config/initializers/008-rack-cors.rb

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# frozen_string_literal: true
class Discourse::Cors
ORIGINS_ENV = "Discourse_Cors_Origins"
def initialize(app, options = nil)
@app = app
if GlobalSetting.enable_cors && GlobalSetting.cors_origin.present?
@global_origins = GlobalSetting.cors_origin.split(',').map(&:strip)
end
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end
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def call(env)
cors_origins = @global_origins || []
cors_origins += SiteSetting.cors_origins.split('|') if SiteSetting.cors_origins.present?
cors_origins = cors_origins.presence
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if env['REQUEST_METHOD'] == ('OPTIONS') && env['HTTP_ACCESS_CONTROL_REQUEST_METHOD']
return [200, Discourse::Cors.apply_headers(cors_origins, env, {}), []]
end
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env[Discourse::Cors::ORIGINS_ENV] = cors_origins if cors_origins
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status, headers, body = @app.call(env)
headers ||= {}
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Discourse::Cors.apply_headers(cors_origins, env, headers) if cors_origins
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[status, headers, body]
end
def self.apply_headers(cors_origins, env, headers)
origin = nil
if cors_origins
if origin = env['HTTP_ORIGIN']
origin = nil unless cors_origins.include?(origin)
end
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headers['Access-Control-Allow-Origin'] = origin || cors_origins[0]
headers['Access-Control-Allow-Headers'] = 'Content-Type, Cache-Control, X-Requested-With, X-CSRF-Token, Discourse-Visible, User-Api-Key, User-Api-Client-Id'
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headers['Access-Control-Allow-Credentials'] = 'true'
headers['Access-Control-Allow-Methods'] = 'POST, PUT, GET, OPTIONS, DELETE'
end
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headers
end
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end
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if GlobalSetting.enable_cors
Rails.configuration.middleware.insert_before ActionDispatch::Flash, Discourse::Cors
end