58 lines
2.0 KiB
Ruby
58 lines
2.0 KiB
Ruby
# frozen_string_literal: true
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# since all the rescue from clauses are not caught by the application controller for matches
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# we need to handle certain exceptions here
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module Middleware
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class DiscoursePublicExceptions < ::ActionDispatch::PublicExceptions
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def initialize(path)
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super
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end
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def call(env)
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# this is so so gnarly
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# sometimes we leak out exceptions prior to creating a controller instance
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# this can happen if we have an exception in a route constraint in some cases
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# this code re-dispatches the exception to our application controller so we can
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# properly translate the exception to a page
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exception = env["action_dispatch.exception"]
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response = ActionDispatch::Response.new
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# Special handling for invalid params, in this case we can not re-dispatch
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# the Request object has a "broken" .params which can not be accessed
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exception = nil if Rack::QueryParser::InvalidParameterError === exception
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# We also can not dispatch bad requests as no proper params
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exception = nil if ActionController::BadRequest === exception
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if exception
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begin
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fake_controller = ApplicationController.new
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fake_controller.response = response
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fake_controller.request = request = ActionDispatch::Request.new(env)
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# We can not re-dispatch bad mime types
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begin
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request.format
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rescue Mime::Type::InvalidMimeType
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return [400, { "Cache-Control" => "private, max-age=0, must-revalidate" }, ["Invalid MIME type"]]
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end
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if ApplicationController.rescue_with_handler(exception, object: fake_controller)
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body = response.body
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if String === body
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body = [body]
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end
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return [response.status, response.headers, body]
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end
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rescue => e
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Discourse.warn_exception(e, message: "Failed to handle exception in exception app middleware")
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end
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end
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super
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end
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end
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end
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