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PhabricatorDebugController.php
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			<?php

			/**
			* This controller eases debugging of application problems that don't repro
			* locally by allowing installs to add arbitrary debugging code easily. To use
			* it:
			*
			* - Write some diagnostic script.
			* - Instruct the user to install it in `/support/debug.php`.
			* - Tell them to visit `/debug/`.
			*/
			final class PhabricatorDebugController extends PhabricatorController {

			public function shouldRequireLogin() {
			return false;
			}

			public function processRequest() {
			if (!Filesystem::pathExists($this->getDebugFilePath())) {
			return new Aphront404Response();
			}

			$request = $this->getRequest();
			$user = $request->getUser();

			ob_start();
			require_once $this->getDebugFilePath();
			$out = ob_get_clean();

			$response = new AphrontWebpageResponse();
			$response->setContent(phutil_tag('pre', array(), $out));
			return $response;
			}

			private function getDebugFilePath() {
			$root = dirname(phutil_get_library_root('phabricator'));
			return $root.'/support/debug.php';
			}
			}