discourse/lib/middleware/discourse_public_exceptions.rb

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