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<?php |
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/** |
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* Image Manager |
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*/ |
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namespace Onigoetz\Imagecache; |
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/** |
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* Image manager |
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* |
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* Prepares the images for the cache |
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* |
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* |
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* @author Stéphane Goetz |
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*/ |
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class Transfer |
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{ |
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protected $path; |
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protected $headers = []; |
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protected $status = 200; |
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public function __construct($path) |
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{ |
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$this->path = $path; |
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$this->getTransferInformations(); |
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} |
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public function getHeaders() |
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{ |
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return $this->headers; |
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} |
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public function getFormattedHeaders() |
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{ |
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$headers = []; |
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foreach ($this->headers as $name => $value) { |
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$headers[] = "$name: $value"; |
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} |
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return $headers; |
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} |
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public function getStatus() |
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{ |
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return $this->status; |
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} |
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protected function getTransferInformations() |
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{ |
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$size = getimagesize($this->path); |
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$this->headers['Content-Type'] = $size['mime']; |
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if ($fileinfo = stat($this->path)) { |
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$this->headers['Content-Length'] = $fileinfo[7]; |
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$this->headers['Expires'] = gmdate('D, d M Y H:i:s', time() + 1209600) . ' GMT'; |
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$this->headers['Cache-Control'] = 'max-age=1209600, private, must-revalidate'; |
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$this->getCachingHeaders($fileinfo); |
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} |
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} |
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/** |
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* Transfer an image to the browser |
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*/ |
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public function stream() |
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{ |
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if (ob_get_level()) { |
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ob_end_clean(); |
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} |
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// Transfer file in 1024 byte chunks to save memory usage. |
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if ($fd = fopen($this->path, 'rb')) { |
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while (!feof($fd)) { |
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echo fread($fd, 1024); |
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} |
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fclose($fd); |
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} |
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} |
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/** |
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* Set file headers that handle "If-Modified-Since" correctly for the |
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* given fileinfo. |
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* |
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* @param array $fileinfo Array returned by stat(). |
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*/ |
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protected function getCachingHeaders($fileinfo) |
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{ |
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// Set default values: |
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$last_modified = gmdate('D, d M Y H:i:s', $fileinfo[9]) . ' GMT'; |
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$etag = md5($last_modified); |
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// See if the client has provided the required HTTP headers: |
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$if_modified_since = $this->server_value('HTTP_IF_MODIFIED_SINCE', false); |
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$if_none_match = $this->server_value('HTTP_IF_NONE_MATCH', false); |
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if ($if_modified_since && $if_none_match && $if_none_match == $etag && $if_modified_since == $last_modified) { |
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$this->status = 304; |
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} |
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// Send appropriate response: |
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$this->headers['Last-Modified'] = $last_modified; |
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$this->headers['ETag'] = $etag; |
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} |
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protected function server_value($key, $default) |
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{ |
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return array_key_exists($key, $_SERVER) ? $_SERVER[$key] : $default; |
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} |
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} |
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Instead of super-globals, we recommend to explicitly inject the dependencies of your class. This makes your code less dependent on global state and it becomes generally more testable: