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- 06.01.2017
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Ssi.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\HttpKernel\HttpCache;
013
014 use Symfony\Component\HttpFoundation\Request;
015 use Symfony\Component\HttpFoundation\Response;
016 use Symfony\Component\HttpKernel\HttpKernelInterface;
017
018 /**
019 * Ssi implements the SSI capabilities to Request and Response instances.
020 *
021 * @author Sebastian Krebs <krebs.seb@gmail.com>
022 */
023 class Ssi implements SurrogateInterface
024 {
025 private $contentTypes;
026 private $phpEscapeMap = array(
027 array('<?', '<%', '<s', '<S'),
028 array('<?php echo "<?"; ?>', '<?php echo "<%"; ?>', '<?php echo "<s"; ?>', '<?php echo "<S"; ?>'),
029 );
030
031 /**
032 * Constructor.
033 *
034 * @param array $contentTypes An array of content-type that should be parsed for SSI information
035 * (default: text/html, text/xml, application/xhtml+xml, and application/xml)
036 */
037 public function __construct(array $contentTypes = array('text/html', 'text/xml', 'application/xhtml+xml', 'application/xml'))
038 {
039 $this->contentTypes = $contentTypes;
040 }
041
042 /**
043 * {@inheritdoc}
044 */
045 public function getName()
046 {
047 return 'ssi';
048 }
049
050 /**
051 * {@inheritdoc}
052 */
053 public function createCacheStrategy()
054 {
055 return new ResponseCacheStrategy();
056 }
057
058 /**
059 * {@inheritdoc}
060 */
061 public function hasSurrogateCapability(Request $request)
062 {
063 if (null === $value = $request->headers->get('Surrogate-Capability')) {
064 return false;
065 }
066
067 return false !== strpos($value, 'SSI/1.0');
068 }
069
070 /**
071 * {@inheritdoc}
072 */
073 public function addSurrogateCapability(Request $request)
074 {
075 $current = $request->headers->get('Surrogate-Capability');
076 $new = 'symfony2="SSI/1.0"';
077
078 $request->headers->set('Surrogate-Capability', $current ? $current.', '.$new : $new);
079 }
080
081 /**
082 * {@inheritdoc}
083 */
084 public function addSurrogateControl(Response $response)
085 {
086 if (false !== strpos($response->getContent(), '<!--#include')) {
087 $response->headers->set('Surrogate-Control', 'content="SSI/1.0"');
088 }
089 }
090
091 /**
092 * {@inheritdoc}
093 */
094 public function needsParsing(Response $response)
095 {
096 if (!$control = $response->headers->get('Surrogate-Control')) {
097 return false;
098 }
099
100 return (bool) preg_match('#content="[^"]*SSI/1.0[^"]*"#', $control);
101 }
102
103 /**
104 * {@inheritdoc}
105 */
106 public function renderIncludeTag($uri, $alt = null, $ignoreErrors = true, $comment = '')
107 {
108 return sprintf('<!--#include virtual="%s" -->', $uri);
109 }
110
111 /**
112 * {@inheritdoc}
113 */
114 public function process(Request $request, Response $response)
115 {
116 $type = $response->headers->get('Content-Type');
117 if (empty($type)) {
118 $type = 'text/html';
119 }
120
121 $parts = explode(';', $type);
122 if (!in_array($parts[0], $this->contentTypes)) {
123 return $response;
124 }
125
126 // we don't use a proper XML parser here as we can have SSI tags in a plain text response
127 $content = $response->getContent();
128
129 $chunks = preg_split('#<!--\#include\s+(.*?)\s*-->#', $content, -1, PREG_SPLIT_DELIM_CAPTURE);
130 $chunks[0] = str_replace($this->phpEscapeMap[0], $this->phpEscapeMap[1], $chunks[0]);
131
132 $i = 1;
133 while (isset($chunks[$i])) {
134 $options = array();
135 preg_match_all('/(virtual)="([^"]*?)"/', $chunks[$i], $matches, PREG_SET_ORDER);
136 foreach ($matches as $set) {
137 $options[$set[1]] = $set[2];
138 }
139
140 if (!isset($options['virtual'])) {
141 throw new \RuntimeException('Unable to process an SSI tag without a "virtual" attribute.');
142 }
143
144 $chunks[$i] = sprintf('<?php echo $this->surrogate->handle($this, %s, \'\', false) ?>'."\n",
145 var_export($options['virtual'], true)
146 );
147 ++$i;
148 $chunks[$i] = str_replace($this->phpEscapeMap[0], $this->phpEscapeMap[1], $chunks[$i]);
149 ++$i;
150 }
151 $content = implode('', $chunks);
152
153 $response->setContent($content);
154 $response->headers->set('X-Body-Eval', 'SSI');
155
156 // remove SSI/1.0 from the Surrogate-Control header
157 if ($response->headers->has('Surrogate-Control')) {
158 $value = $response->headers->get('Surrogate-Control');
159 if ('content="SSI/1.0"' == $value) {
160 $response->headers->remove('Surrogate-Control');
161 } elseif (preg_match('#,\s*content="SSI/1.0"#', $value)) {
162 $response->headers->set('Surrogate-Control', preg_replace('#,\s*content="SSI/1.0"#', '', $value));
163 } elseif (preg_match('#content="SSI/1.0",\s*#', $value)) {
164 $response->headers->set('Surrogate-Control', preg_replace('#content="SSI/1.0",\s*#', '', $value));
165 }
166 }
167 }
168
169 /**
170 * {@inheritdoc}
171 */
172 public function handle(HttpCache $cache, $uri, $alt, $ignoreErrors)
173 {
174 $subRequest = Request::create($uri, 'get', array(), $cache->getRequest()->cookies->all(), array(), $cache->getRequest()->server->all());
175
176 try {
177 $response = $cache->handle($subRequest, HttpKernelInterface::SUB_REQUEST, true);
178
179 if (!$response->isSuccessful()) {
180 throw new \RuntimeException(sprintf('Error when rendering "%s" (Status code is %s).', $subRequest->getUri(), $response->getStatusCode()));
181 }
182
183 return $response->getContent();
184 } catch (\Exception $e) {
185 if ($alt) {
186 return $this->handle($cache, $alt, '', $ignoreErrors);
187 }
188
189 if (!$ignoreErrors) {
190 throw $e;
191 }
192 }
193 }
194 }
195