1: <?php
2: /**
3: * Error handler
4: *
5: * Provides Error Capturing for Framework errors.
6: *
7: * PHP 5
8: *
9: * CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
10: * Copyright 2005-2012, Cake Software Foundation, Inc. (http://cakefoundation.org)
11: *
12: * Licensed under The MIT License
13: * Redistributions of files must retain the above copyright notice.
14: *
15: * @copyright Copyright 2005-2012, Cake Software Foundation, Inc. (http://cakefoundation.org)
16: * @link http://cakephp.org CakePHP(tm) Project
17: * @package Cake.Error
18: * @since CakePHP(tm) v 0.10.5.1732
19: * @license MIT License (http://www.opensource.org/licenses/mit-license.php)
20: */
21:
22: App::uses('Debugger', 'Utility');
23: App::uses('CakeLog', 'Log');
24: App::uses('ExceptionRenderer', 'Error');
25: App::uses('AppController', 'Controller');
26:
27: /**
28: *
29: * Error Handler provides basic error and exception handling for your application. It captures and
30: * handles all unhandled exceptions and errors. Displays helpful framework errors when debug > 1.
31: *
32: * ### Uncaught exceptions
33: *
34: * When debug < 1 a CakeException will render 404 or 500 errors. If an uncaught exception is thrown
35: * and it is a type that ErrorHandler does not know about it will be treated as a 500 error.
36: *
37: * ### Implementing application specific exception handling
38: *
39: * You can implement application specific exception handling in one of a few ways. Each approach
40: * gives you different amounts of control over the exception handling process.
41: *
42: * - Set Configure::write('Exception.handler', 'YourClass::yourMethod');
43: * - Create AppController::appError();
44: * - Set Configure::write('Exception.renderer', 'YourClass');
45: *
46: * #### Create your own Exception handler with `Exception.handler`
47: *
48: * This gives you full control over the exception handling process. The class you choose should be
49: * loaded in your app/Config/bootstrap.php, so its available to handle any exceptions. You can
50: * define the handler as any callback type. Using Exception.handler overrides all other exception
51: * handling settings and logic.
52: *
53: * #### Using `AppController::appError();`
54: *
55: * This controller method is called instead of the default exception rendering. It receives the
56: * thrown exception as its only argument. You should implement your error handling in that method.
57: * Using AppController::appError(), will supersede any configuration for Exception.renderer.
58: *
59: * #### Using a custom renderer with `Exception.renderer`
60: *
61: * If you don't want to take control of the exception handling, but want to change how exceptions are
62: * rendered you can use `Exception.renderer` to choose a class to render exception pages. By default
63: * `ExceptionRenderer` is used. Your custom exception renderer class should be placed in app/Lib/Error.
64: *
65: * Your custom renderer should expect an exception in its constructor, and implement a render method.
66: * Failing to do so will cause additional errors.
67: *
68: * #### Logging exceptions
69: *
70: * Using the built-in exception handling, you can log all the exceptions
71: * that are dealt with by ErrorHandler by setting `Exception.log` to true in your core.php.
72: * Enabling this will log every exception to CakeLog and the configured loggers.
73: *
74: * ### PHP errors
75: *
76: * Error handler also provides the built in features for handling php errors (trigger_error).
77: * While in debug mode, errors will be output to the screen using debugger. While in production mode,
78: * errors will be logged to CakeLog. You can control which errors are logged by setting
79: * `Error.level` in your core.php.
80: *
81: * #### Logging errors
82: *
83: * When ErrorHandler is used for handling errors, you can enable error logging by setting `Error.log` to true.
84: * This will log all errors to the configured log handlers.
85: *
86: * #### Controlling what errors are logged/displayed
87: *
88: * You can control which errors are logged / displayed by ErrorHandler by setting `Error.level`. Setting this
89: * to one or a combination of a few of the E_* constants will only enable the specified errors.
90: *
91: * e.g. `Configure::write('Error.level', E_ALL & ~E_NOTICE);`
92: *
93: * Would enable handling for all non Notice errors.
94: *
95: * @package Cake.Error
96: * @see ExceptionRenderer for more information on how to customize exception rendering.
97: */
98: class ErrorHandler {
99:
100: /**
101: * Set as the default exception handler by the CakePHP bootstrap process.
102: *
103: * This will either use custom exception renderer class if configured,
104: * or use the default ExceptionRenderer.
105: *
106: * @param Exception $exception
107: * @return void
108: * @see http://php.net/manual/en/function.set-exception-handler.php
109: */
110: public static function handleException(Exception $exception) {
111: $config = Configure::read('Exception');
112: if (!empty($config['log'])) {
113: $message = sprintf("[%s] %s\n%s",
114: get_class($exception),
115: $exception->getMessage(),
116: $exception->getTraceAsString()
117: );
118: CakeLog::write(LOG_ERR, $message);
119: }
120: $renderer = $config['renderer'];
121: if ($renderer !== 'ExceptionRenderer') {
122: list($plugin, $renderer) = pluginSplit($renderer, true);
123: App::uses($renderer, $plugin . 'Error');
124: }
125: try {
126: $error = new $renderer($exception);
127: $error->render();
128: } catch (Exception $e) {
129: set_error_handler(Configure::read('Error.handler')); // Should be using configured ErrorHandler
130: Configure::write('Error.trace', false); // trace is useless here since it's internal
131: $message = sprintf("[%s] %s\n%s", // Keeping same message format
132: get_class($e),
133: $e->getMessage(),
134: $e->getTraceAsString()
135: );
136: trigger_error($message, E_USER_ERROR);
137: }
138: }
139:
140: /**
141: * Set as the default error handler by CakePHP. Use Configure::write('Error.handler', $callback), to use your own
142: * error handling methods. This function will use Debugger to display errors when debug > 0. And
143: * will log errors to CakeLog, when debug == 0.
144: *
145: * You can use Configure::write('Error.level', $value); to set what type of errors will be handled here.
146: * Stack traces for errors can be enabled with Configure::write('Error.trace', true);
147: *
148: * @param integer $code Code of error
149: * @param string $description Error description
150: * @param string $file File on which error occurred
151: * @param integer $line Line that triggered the error
152: * @param array $context Context
153: * @return boolean true if error was handled
154: */
155: public static function handleError($code, $description, $file = null, $line = null, $context = null) {
156: if (error_reporting() === 0) {
157: return false;
158: }
159: $errorConfig = Configure::read('Error');
160: list($error, $log) = self::mapErrorCode($code);
161:
162: $debug = Configure::read('debug');
163: if ($debug) {
164: $data = array(
165: 'level' => $log,
166: 'code' => $code,
167: 'error' => $error,
168: 'description' => $description,
169: 'file' => $file,
170: 'line' => $line,
171: 'context' => $context,
172: 'start' => 2,
173: 'path' => Debugger::trimPath($file)
174: );
175: return Debugger::getInstance()->outputError($data);
176: } else {
177: $message = $error . ' (' . $code . '): ' . $description . ' in [' . $file . ', line ' . $line . ']';
178: if (!empty($errorConfig['trace'])) {
179: $trace = Debugger::trace(array('start' => 1, 'format' => 'log'));
180: $message .= "\nTrace:\n" . $trace . "\n";
181: }
182: return CakeLog::write($log, $message);
183: }
184: }
185:
186: /**
187: * Map an error code into an Error word, and log location.
188: *
189: * @param integer $code Error code to map
190: * @return array Array of error word, and log location.
191: */
192: public static function mapErrorCode($code) {
193: $error = $log = null;
194: switch ($code) {
195: case E_PARSE:
196: case E_ERROR:
197: case E_CORE_ERROR:
198: case E_COMPILE_ERROR:
199: case E_USER_ERROR:
200: $error = 'Fatal Error';
201: $log = LOG_ERROR;
202: break;
203: case E_WARNING:
204: case E_USER_WARNING:
205: case E_COMPILE_WARNING:
206: case E_RECOVERABLE_ERROR:
207: $error = 'Warning';
208: $log = LOG_WARNING;
209: break;
210: case E_NOTICE:
211: case E_USER_NOTICE:
212: $error = 'Notice';
213: $log = LOG_NOTICE;
214: break;
215: case E_STRICT:
216: $error = 'Strict';
217: $log = LOG_NOTICE;
218: break;
219: case E_DEPRECATED:
220: case E_USER_DEPRECATED:
221: $error = 'Deprecated';
222: $log = LOG_NOTICE;
223: break;
224: }
225: return array($error, $log);
226: }
227:
228: }
229: