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DebugClassLoader.php
001 <?php
002
003 /*
004 * This file is part of the Symfony package.
005 *
006 * (c) Fabien Potencier <fabien@symfony.com>
007 *
008 * For the full copyright and license information, please view the LICENSE
009 * file that was distributed with this source code.
010 */
011
012 namespace Symfony\Component\Debug;
013
014 /**
015 * Autoloader checking if the class is really defined in the file found.
016 *
017 * The ClassLoader will wrap all registered autoloaders
018 * and will throw an exception if a file is found but does
019 * not declare the class.
020 *
021 * @author Fabien Potencier <fabien@symfony.com>
022 * @author Christophe Coevoet <stof@notk.org>
023 * @author Nicolas Grekas <p@tchwork.com>
024 */
025 class DebugClassLoader
026 {
027 private $classLoader;
028 private $isFinder;
029 private $loaded = [];
030 private static $caseCheck;
031 private static $checkedClasses = [];
032 private static $final = [];
033 private static $finalMethods = [];
034 private static $deprecated = [];
035 private static $internal = [];
036 private static $internalMethods = [];
037 private static $php7Reserved = ['int' => 1, 'float' => 1, 'bool' => 1, 'string' => 1, 'true' => 1, 'false' => 1, 'null' => 1];
038 private static $darwinCache = ['/' => ['/', []]];
039
040 public function __construct(callable $classLoader)
041 {
042 $this->classLoader = $classLoader;
043 $this->isFinder = \is_array($classLoader) && method_exists($classLoader[0], 'findFile');
044
045 if (!isset(self::$caseCheck)) {
046 $file = file_exists(__FILE__) ? __FILE__ : rtrim(realpath('.'), \DIRECTORY_SEPARATOR);
047 $i = strrpos($file, \DIRECTORY_SEPARATOR);
048 $dir = substr($file, 0, 1 + $i);
049 $file = substr($file, 1 + $i);
050 $test = strtoupper($file) === $file ? strtolower($file) : strtoupper($file);
051 $test = realpath($dir.$test);
052
053 if (false === $test || false === $i) {
054 // filesystem is case sensitive
055 self::$caseCheck = 0;
056 } elseif (substr($test, -\strlen($file)) === $file) {
057 // filesystem is case insensitive and realpath() normalizes the case of characters
058 self::$caseCheck = 1;
059 } elseif (false !== stripos(\PHP_OS, 'darwin')) {
060 // on MacOSX, HFS+ is case insensitive but realpath() doesn't normalize the case of characters
061 self::$caseCheck = 2;
062 } else {
063 // filesystem case checks failed, fallback to disabling them
064 self::$caseCheck = 0;
065 }
066 }
067 }
068
069 /**
070 * Gets the wrapped class loader.
071 *
072 * @return callable The wrapped class loader
073 */
074 public function getClassLoader()
075 {
076 return $this->classLoader;
077 }
078
079 /**
080 * Wraps all autoloaders.
081 */
082 public static function enable()
083 {
084 // Ensures we don't hit https://bugs.php.net/42098
085 class_exists('Symfony\Component\Debug\ErrorHandler');
086 class_exists('Psr\Log\LogLevel');
087
088 if (!\is_array($functions = spl_autoload_functions())) {
089 return;
090 }
091
092 foreach ($functions as $function) {
093 spl_autoload_unregister($function);
094 }
095
096 foreach ($functions as $function) {
097 if (!\is_array($function) || !$function[0] instanceof self) {
098 $function = [new static($function), 'loadClass'];
099 }
100
101 spl_autoload_register($function);
102 }
103 }
104
105 /**
106 * Disables the wrapping.
107 */
108 public static function disable()
109 {
110 if (!\is_array($functions = spl_autoload_functions())) {
111 return;
112 }
113
114 foreach ($functions as $function) {
115 spl_autoload_unregister($function);
116 }
117
118 foreach ($functions as $function) {
119 if (\is_array($function) && $function[0] instanceof self) {
120 $function = $function[0]->getClassLoader();
121 }
122
123 spl_autoload_register($function);
124 }
125 }
126
127 /**
128 * @return string|null
129 */
130 public function findFile($class)
131 {
132 return $this->isFinder ? $this->classLoader[0]->findFile($class) ?: null : null;
133 }
134
135 /**
136 * Loads the given class or interface.
137 *
138 * @param string $class The name of the class
139 *
140 * @throws \RuntimeException
141 */
142 public function loadClass($class)
143 {
144 $e = error_reporting(error_reporting() | \E_PARSE | \E_ERROR | \E_CORE_ERROR | \E_COMPILE_ERROR);
145
146 try {
147 if ($this->isFinder && !isset($this->loaded[$class])) {
148 $this->loaded[$class] = true;
149 if (!$file = $this->classLoader[0]->findFile($class) ?: false) {
150 // no-op
151 } elseif (\function_exists('opcache_is_script_cached') && @opcache_is_script_cached($file)) {
152 include $file;
153
154 return;
155 } elseif (false === include $file) {
156 return;
157 }
158 } else {
159 \call_user_func($this->classLoader, $class);
160 $file = false;
161 }
162 } finally {
163 error_reporting($e);
164 }
165
166 $this->checkClass($class, $file);
167 }
168
169 private function checkClass($class, $file = null)
170 {
171 $exists = null === $file || class_exists($class, false) || interface_exists($class, false) || trait_exists($class, false);
172
173 if (null !== $file && $class && '\\' === $class[0]) {
174 $class = substr($class, 1);
175 }
176
177 if ($exists) {
178 if (isset(self::$checkedClasses[$class])) {
179 return;
180 }
181 self::$checkedClasses[$class] = true;
182
183 $refl = new \ReflectionClass($class);
184 if (null === $file && $refl->isInternal()) {
185 return;
186 }
187 $name = $refl->getName();
188
189 if ($name !== $class && 0 === strcasecmp($name, $class)) {
190 throw new \RuntimeException(sprintf('Case mismatch between loaded and declared class names: "%s" vs "%s".', $class, $name));
191 }
192
193 $deprecations = $this->checkAnnotations($refl, $name);
194
195 if (isset(self::$php7Reserved[strtolower($refl->getShortName())])) {
196 $deprecations[] = sprintf('The "%s" class uses the reserved name "%s", it will break on PHP 7 and higher', $name, $refl->getShortName());
197 }
198
199 foreach ($deprecations as $message) {
200 @trigger_error($message, \E_USER_DEPRECATED);
201 }
202 }
203
204 if (!$file) {
205 return;
206 }
207
208 if (!$exists) {
209 if (false !== strpos($class, '/')) {
210 throw new \RuntimeException(sprintf('Trying to autoload a class with an invalid name "%s". Be careful that the namespace separator is "\" in PHP, not "/".', $class));
211 }
212
213 throw new \RuntimeException(sprintf('The autoloader expected class "%s" to be defined in file "%s". The file was found but the class was not in it, the class name or namespace probably has a typo.', $class, $file));
214 }
215
216 if (self::$caseCheck && $message = $this->checkCase($refl, $file, $class)) {
217 throw new \RuntimeException(sprintf('Case mismatch between class and real file names: "%s" vs "%s" in "%s".', $message[0], $message[1], $message[2]));
218 }
219 }
220
221 public function checkAnnotations(\ReflectionClass $refl, $class)
222 {
223 $deprecations = [];
224
225 // Don't trigger deprecations for classes in the same vendor
226 if (2 > $len = 1 + (strpos($class, '\\') ?: strpos($class, '_'))) {
227 $len = 0;
228 $ns = '';
229 } else {
230 $ns = str_replace('_', '\\', substr($class, 0, $len));
231 }
232
233 // Detect annotations on the class
234 if (false !== $doc = $refl->getDocComment()) {
235 foreach (['final', 'deprecated', 'internal'] as $annotation) {
236 if (false !== strpos($doc, $annotation) && preg_match('#\n\s+\* @'.$annotation.'(?:( .+?)\.?)?\r?\n\s+\*(?: @|/$|\r?\n)#s', $doc, $notice)) {
237 self::${$annotation}[$class] = isset($notice[1]) ? preg_replace('#\.?\r?\n( \*)? *(?= |\r?\n|$)#', '', $notice[1]) : '';
238 }
239 }
240 }
241
242 $parent = get_parent_class($class);
243 $parentAndOwnInterfaces = $this->getOwnInterfaces($class, $parent);
244 if ($parent) {
245 $parentAndOwnInterfaces[$parent] = $parent;
246
247 if (!isset(self::$checkedClasses[$parent])) {
248 $this->checkClass($parent);
249 }
250
251 if (isset(self::$final[$parent])) {
252 $deprecations[] = sprintf('The "%s" class is considered final%s. It may change without further notice as of its next major version. You should not extend it from "%s".', $parent, self::$final[$parent], $class);
253 }
254 }
255
256 // Detect if the parent is annotated
257 foreach ($parentAndOwnInterfaces + class_uses($class, false) as $use) {
258 if (!isset(self::$checkedClasses[$use])) {
259 $this->checkClass($use);
260 }
261 if (isset(self::$deprecated[$use]) && strncmp($ns, str_replace('_', '\\', $use), $len) && !isset(self::$deprecated[$class])) {
262 $type = class_exists($class, false) ? 'class' : (interface_exists($class, false) ? 'interface' : 'trait');
263 $verb = class_exists($use, false) || interface_exists($class, false) ? 'extends' : (interface_exists($use, false) ? 'implements' : 'uses');
264
265 $deprecations[] = sprintf('The "%s" %s %s "%s" that is deprecated%s.', $class, $type, $verb, $use, self::$deprecated[$use]);
266 }
267 if (isset(self::$internal[$use]) && strncmp($ns, str_replace('_', '\\', $use), $len)) {
268 $deprecations[] = sprintf('The "%s" %s is considered internal%s. It may change without further notice. You should not use it from "%s".', $use, class_exists($use, false) ? 'class' : (interface_exists($use, false) ? 'interface' : 'trait'), self::$internal[$use], $class);
269 }
270 }
271
272 if (trait_exists($class)) {
273 return $deprecations;
274 }
275
276 // Inherit @final and @internal annotations for methods
277 self::$finalMethods[$class] = [];
278 self::$internalMethods[$class] = [];
279 foreach ($parentAndOwnInterfaces as $use) {
280 foreach (['finalMethods', 'internalMethods'] as $property) {
281 if (isset(self::${$property}[$use])) {
282 self::${$property}[$class] = self::${$property}[$class] ? self::${$property}[$use] + self::${$property}[$class] : self::${$property}[$use];
283 }
284 }
285 }
286
287 foreach ($refl->getMethods(\ReflectionMethod::IS_PUBLIC | \ReflectionMethod::IS_PROTECTED) as $method) {
288 if ($method->class !== $class) {
289 continue;
290 }
291
292 if ($parent && isset(self::$finalMethods[$parent][$method->name])) {
293 list($declaringClass, $message) = self::$finalMethods[$parent][$method->name];
294 $deprecations[] = sprintf('The "%s::%s()" method is considered final%s. It may change without further notice as of its next major version. You should not extend it from "%s".', $declaringClass, $method->name, $message, $class);
295 }
296
297 if (isset(self::$internalMethods[$class][$method->name])) {
298 list($declaringClass, $message) = self::$internalMethods[$class][$method->name];
299 if (strncmp($ns, $declaringClass, $len)) {
300 $deprecations[] = sprintf('The "%s::%s()" method is considered internal%s. It may change without further notice. You should not extend it from "%s".', $declaringClass, $method->name, $message, $class);
301 }
302 }
303
304 // Detect method annotations
305 if (false === $doc = $method->getDocComment()) {
306 continue;
307 }
308
309 foreach (['final', 'internal'] as $annotation) {
310 if (false !== strpos($doc, $annotation) && preg_match('#\n\s+\* @'.$annotation.'(?:( .+?)\.?)?\r?\n\s+\*(?: @|/$|\r?\n)#s', $doc, $notice)) {
311 $message = isset($notice[1]) ? preg_replace('#\.?\r?\n( \*)? *(?= |\r?\n|$)#', '', $notice[1]) : '';
312 self::${$annotation.'Methods'}[$class][$method->name] = [$class, $message];
313 }
314 }
315 }
316
317 return $deprecations;
318 }
319
320 /**
321 * @param string $file
322 * @param string $class
323 *
324 * @return array|null
325 */
326 public function checkCase(\ReflectionClass $refl, $file, $class)
327 {
328 $real = explode('\\', $class.strrchr($file, '.'));
329 $tail = explode(\DIRECTORY_SEPARATOR, str_replace('/', \DIRECTORY_SEPARATOR, $file));
330
331 $i = \count($tail) - 1;
332 $j = \count($real) - 1;
333
334 while (isset($tail[$i], $real[$j]) && $tail[$i] === $real[$j]) {
335 --$i;
336 --$j;
337 }
338
339 array_splice($tail, 0, $i + 1);
340
341 if (!$tail) {
342 return null;
343 }
344
345 $tail = \DIRECTORY_SEPARATOR.implode(\DIRECTORY_SEPARATOR, $tail);
346 $tailLen = \strlen($tail);
347 $real = $refl->getFileName();
348
349 if (2 === self::$caseCheck) {
350 $real = $this->darwinRealpath($real);
351 }
352
353 if (0 === substr_compare($real, $tail, -$tailLen, $tailLen, true)
354 && 0 !== substr_compare($real, $tail, -$tailLen, $tailLen, false)
355 ) {
356 return [substr($tail, -$tailLen + 1), substr($real, -$tailLen + 1), substr($real, 0, -$tailLen + 1)];
357 }
358
359 return null;
360 }
361
362 /**
363 * `realpath` on MacOSX doesn't normalize the case of characters.
364 */
365 private function darwinRealpath($real)
366 {
367 $i = 1 + strrpos($real, '/');
368 $file = substr($real, $i);
369 $real = substr($real, 0, $i);
370
371 if (isset(self::$darwinCache[$real])) {
372 $kDir = $real;
373 } else {
374 $kDir = strtolower($real);
375
376 if (isset(self::$darwinCache[$kDir])) {
377 $real = self::$darwinCache[$kDir][0];
378 } else {
379 $dir = getcwd();
380 chdir($real);
381 $real = getcwd().'/';
382 chdir($dir);
383
384 $dir = $real;
385 $k = $kDir;
386 $i = \strlen($dir) - 1;
387 while (!isset(self::$darwinCache[$k])) {
388 self::$darwinCache[$k] = [$dir, []];
389 self::$darwinCache[$dir] = &self::$darwinCache[$k];
390
391 while ('/' !== $dir[--$i]) {
392 }
393 $k = substr($k, 0, ++$i);
394 $dir = substr($dir, 0, $i--);
395 }
396 }
397 }
398
399 $dirFiles = self::$darwinCache[$kDir][1];
400
401 if (!isset($dirFiles[$file]) && ') : eval()\'d code' === substr($file, -17)) {
402 // Get the file name from "file_name.php(123) : eval()'d code"
403 $file = substr($file, 0, strrpos($file, '(', -17));
404 }
405
406 if (isset($dirFiles[$file])) {
407 return $real.$dirFiles[$file];
408 }
409
410 $kFile = strtolower($file);
411
412 if (!isset($dirFiles[$kFile])) {
413 foreach (scandir($real, 2) as $f) {
414 if ('.' !== $f[0]) {
415 $dirFiles[$f] = $f;
416 if ($f === $file) {
417 $kFile = $k = $file;
418 } elseif ($f !== $k = strtolower($f)) {
419 $dirFiles[$k] = $f;
420 }
421 }
422 }
423 self::$darwinCache[$kDir][1] = $dirFiles;
424 }
425
426 return $real.$dirFiles[$kFile];
427 }
428
429 /**
430 * `class_implements` includes interfaces from the parents so we have to manually exclude them.
431 *
432 * @param string $class
433 * @param string|false $parent
434 *
435 * @return string[]
436 */
437 private function getOwnInterfaces($class, $parent)
438 {
439 $ownInterfaces = class_implements($class, false);
440
441 if ($parent) {
442 foreach (class_implements($parent, false) as $interface) {
443 unset($ownInterfaces[$interface]);
444 }
445 }
446
447 foreach ($ownInterfaces as $interface) {
448 foreach (class_implements($interface) as $interface) {
449 unset($ownInterfaces[$interface]);
450 }
451 }
452
453 return $ownInterfaces;
454 }
455 }
456