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57 lines
2.1 KiB
Ruby
57 lines
2.1 KiB
Ruby
require 'action_dispatch/http/request'
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require 'action_dispatch/middleware/exception_wrapper'
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module ActionDispatch
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# This middleware rescues any exception returned by the application
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# and calls an exceptions app that will wrap it in a format for the end user.
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#
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# The exceptions app should be passed as parameter on initialization
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# of ShowExceptions. Every time there is an exception, ShowExceptions will
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# store the exception in env["action_dispatch.exception"], rewrite the
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# PATH_INFO to the exception status code and call the rack app.
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#
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# If the application returns a "X-Cascade" pass response, this middleware
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# will send an empty response as result with the correct status code.
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# If any exception happens inside the exceptions app, this middleware
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# catches the exceptions and returns a FAILSAFE_RESPONSE.
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class ShowExceptions
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FAILSAFE_RESPONSE = [500, { 'Content-Type' => 'text/plain' },
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["500 Internal Server Error\n" \
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"If you are the administrator of this website, then please read this web " \
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"application's log file and/or the web server's log file to find out what " \
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"went wrong."]]
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def initialize(app, exceptions_app)
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@app = app
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@exceptions_app = exceptions_app
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end
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def call(env)
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@app.call(env)
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rescue Exception => exception
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if env['action_dispatch.show_exceptions'] == false
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raise exception
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else
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render_exception(env, exception)
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end
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end
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private
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def render_exception(env, exception)
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wrapper = ExceptionWrapper.new(env, exception)
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status = wrapper.status_code
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env["action_dispatch.exception"] = wrapper.exception
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env["PATH_INFO"] = "/#{status}"
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response = @exceptions_app.call(env)
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response[1]['X-Cascade'] == 'pass' ? pass_response(status) : response
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rescue Exception => failsafe_error
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$stderr.puts "Error during failsafe response: #{failsafe_error}\n #{failsafe_error.backtrace * "\n "}"
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FAILSAFE_RESPONSE
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end
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def pass_response(status)
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[status, {"Content-Type" => "text/html; charset=#{Response.default_charset}", "Content-Length" => "0"}, []]
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end
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end
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end
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