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ClassExistenceResource.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\Config\Resource;
013
014 /**
015 * ClassExistenceResource represents a class existence.
016 * Freshness is only evaluated against resource existence.
017 *
018 * The resource must be a fully-qualified class name.
019 *
020 * @author Fabien Potencier <fabien@symfony.com>
021 */
022 class ClassExistenceResource implements SelfCheckingResourceInterface, \Serializable
023 {
024 private $resource;
025 private $exists;
026
027 private static $autoloadLevel = 0;
028 private static $autoloadedClass;
029 private static $existsCache = [];
030
031 /**
032 * @param string $resource The fully-qualified class name
033 * @param bool|null $exists Boolean when the existency check has already been done
034 */
035 public function __construct($resource, $exists = null)
036 {
037 $this->resource = $resource;
038 if (null !== $exists) {
039 $this->exists = [(bool) $exists, null];
040 }
041 }
042
043 /**
044 * {@inheritdoc}
045 */
046 public function __toString()
047 {
048 return $this->resource;
049 }
050
051 /**
052 * @return string The file path to the resource
053 */
054 public function getResource()
055 {
056 return $this->resource;
057 }
058
059 /**
060 * {@inheritdoc}
061 *
062 * @throws \ReflectionException when a parent class/interface/trait is not found
063 */
064 public function isFresh($timestamp)
065 {
066 $loaded = class_exists($this->resource, false) || interface_exists($this->resource, false) || trait_exists($this->resource, false);
067
068 if (null !== $exists = &self::$existsCache[$this->resource]) {
069 if ($loaded) {
070 $exists = [true, null];
071 } elseif (0 >= $timestamp && !$exists[0] && null !== $exists[1]) {
072 throw new \ReflectionException($exists[1]);
073 }
074 } elseif ([false, null] === $exists = [$loaded, null]) {
075 if (!self::$autoloadLevel++) {
076 spl_autoload_register(__CLASS__.'::throwOnRequiredClass');
077 }
078 $autoloadedClass = self::$autoloadedClass;
079 self::$autoloadedClass = ltrim($this->resource, '\\');
080
081 try {
082 $exists[0] = class_exists($this->resource) || interface_exists($this->resource, false) || trait_exists($this->resource, false);
083 } catch (\Exception $e) {
084 $exists[1] = $e->getMessage();
085
086 try {
087 self::throwOnRequiredClass($this->resource, $e);
088 } catch (\ReflectionException $e) {
089 if (0 >= $timestamp) {
090 throw $e;
091 }
092 }
093 } catch (\Throwable $e) {
094 $exists[1] = $e->getMessage();
095
096 throw $e;
097 } finally {
098 self::$autoloadedClass = $autoloadedClass;
099 if (!--self::$autoloadLevel) {
100 spl_autoload_unregister(__CLASS__.'::throwOnRequiredClass');
101 }
102 }
103 }
104
105 if (null === $this->exists) {
106 $this->exists = $exists;
107 }
108
109 return $this->exists[0] xor !$exists[0];
110 }
111
112 /**
113 * @internal
114 */
115 public function serialize()
116 {
117 if (null === $this->exists) {
118 $this->isFresh(0);
119 }
120
121 return serialize([$this->resource, $this->exists]);
122 }
123
124 /**
125 * @internal
126 */
127 public function unserialize($serialized)
128 {
129 list($this->resource, $this->exists) = unserialize($serialized);
130
131 if (\is_bool($this->exists)) {
132 $this->exists = [$this->exists, null];
133 }
134 }
135
136 /**
137 * Throws a reflection exception when the passed class does not exist but is required.
138 *
139 * A class is considered "not required" when it's loaded as part of a "class_exists" or similar check.
140 *
141 * This function can be used as an autoload function to throw a reflection
142 * exception if the class was not found by previous autoload functions.
143 *
144 * A previous exception can be passed. In this case, the class is considered as being
145 * required totally, so if it doesn't exist, a reflection exception is always thrown.
146 * If it exists, the previous exception is rethrown.
147 *
148 * @throws \ReflectionException
149 *
150 * @internal
151 */
152 public static function throwOnRequiredClass($class, \Exception $previous = null)
153 {
154 // If the passed class is the resource being checked, we shouldn't throw.
155 if (null === $previous && self::$autoloadedClass === $class) {
156 return;
157 }
158
159 if (class_exists($class, false) || interface_exists($class, false) || trait_exists($class, false)) {
160 if (null !== $previous) {
161 throw $previous;
162 }
163
164 return;
165 }
166
167 if ($previous instanceof \ReflectionException) {
168 throw $previous;
169 }
170
171 $message = sprintf('Class "%s" not found.', $class);
172
173 if (self::$autoloadedClass !== $class) {
174 $message = substr_replace($message, sprintf(' while loading "%s"', self::$autoloadedClass), -1, 0);
175 }
176
177 if (null !== $previous) {
178 $message = $previous->getMessage();
179 }
180
181 $e = new \ReflectionException($message, 0, $previous);
182
183 if (null !== $previous) {
184 throw $e;
185 }
186
187 $trace = debug_backtrace();
188 $autoloadFrame = [
189 'function' => 'spl_autoload_call',
190 'args' => [$class],
191 ];
192
193 if (\PHP_VERSION_ID >= 80000 && isset($trace[1])) {
194 $callerFrame = $trace[1];
195 $i = 2;
196 } elseif (false !== $i = array_search($autoloadFrame, $trace, true)) {
197 $callerFrame = $trace[++$i];
198 } else {
199 throw $e;
200 }
201
202 if (isset($callerFrame['function']) && !isset($callerFrame['class'])) {
203 switch ($callerFrame['function']) {
204 case 'get_class_methods':
205 case 'get_class_vars':
206 case 'get_parent_class':
207 case 'is_a':
208 case 'is_subclass_of':
209 case 'class_exists':
210 case 'class_implements':
211 case 'class_parents':
212 case 'trait_exists':
213 case 'defined':
214 case 'interface_exists':
215 case 'method_exists':
216 case 'property_exists':
217 case 'is_callable':
218 return;
219 }
220
221 $props = [
222 'file' => isset($callerFrame['file']) ? $callerFrame['file'] : null,
223 'line' => isset($callerFrame['line']) ? $callerFrame['line'] : null,
224 'trace' => \array_slice($trace, 1 + $i),
225 ];
226
227 foreach ($props as $p => $v) {
228 if (null !== $v) {
229 $r = new \ReflectionProperty('Exception', $p);
230 $r->setAccessible(true);
231 $r->setValue($e, $v);
232 }
233 }
234 }
235
236 throw $e;
237 }
238 }
239