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<?php |
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namespace CodeBlog\ToWebP\Convert\Converters; |
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use CodeBlog\ToWebP\AbstractConverter; |
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use Exception; |
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/** |
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* Class Cwebp |
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* |
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* @author Whallysson Avelino <https://github.com/whallysson> |
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* @package CodeBlog\ToWebP\Convert\Converters |
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*/ |
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class Cwebp extends AbstractConverter |
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{ |
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/** |
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* System paths to look for cwebp binary |
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* |
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* @var array |
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*/ |
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private $defaultPaths = [ |
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'/usr/bin/cwebp', |
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'/usr/local/bin/cwebp', |
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'/usr/gnu/bin/cwebp', |
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'/usr/syno/bin/cwebp', |
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]; |
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/** |
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* OS-specific binaries included in this library |
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* |
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* @var mixed |
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*/ |
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private $binary = [ |
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'WinNT' => ['cwebp.exe', '49e9cb98db30bfa27936933e6fd94d407e0386802cb192800d9fd824f6476873'], |
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'Darwin' => ['cwebp-mac12', 'a06a3ee436e375c89dbc1b0b2e8bd7729a55139ae072ed3f7bd2e07de0ebb379'], |
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'SunOS' => ['cwebp-sol', '1febaffbb18e52dc2c524cda9eefd00c6db95bc388732868999c0f48deb73b4f'], |
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'FreeBSD' => ['cwebp-fbsd', 'e5cbea11c97fadffe221fdf57c093c19af2737e4bbd2cb3cd5e908de64286573'], |
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'Linux' => ['cwebp-linux', '916623e5e9183237c851374d969aebdb96e0edc0692ab7937b95ea67dc3b2568'], |
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][PHP_OS]; |
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/** |
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* @return bool|mixed |
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* @throws Exception |
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*/ |
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public function checkRequirements() |
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{ |
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if (!function_exists('exec')) { |
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throw new Exception('exec() is not enabled.'); |
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} |
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return true; |
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} |
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/** |
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* @return array |
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* @throws Exception |
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*/ |
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public function setUpBinaries() |
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{ |
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// Removes system paths if the corresponding binary doesn't exist |
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$binaries = array_filter($this->defaultPaths, function($binary) { |
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return file_exists($binary); |
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}); |
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$binaryFile = __DIR__ . '/Binaries/' . $this->binary[0]; |
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// Throws an exception if binary file does not exist |
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if (!file_exists($binaryFile)) { |
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throw new Exception('Operating system is currently not supported: ' . PHP_OS); |
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} |
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// File exists, now generate its hash |
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$binaryHash = hash_file('sha256', $binaryFile); |
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// Throws an exception if binary file checksum & deposited checksum do not match |
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if ($binaryHash != $this->binary[1]) { |
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throw new Exception('Binary checksum is invalid.'); |
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} |
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$binaries[] = $binaryFile; |
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return $binaries; |
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} |
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/** |
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* Checks if 'Nice' is available |
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* |
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* @return bool |
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*/ |
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public function hasNiceSupport() |
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{ |
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exec("nice 2>&1", $niceOutput); |
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if (is_array($niceOutput) && isset($niceOutput[0])) { |
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if (preg_match('/usage/', $niceOutput[0]) || (preg_match('/^\d+$/', $niceOutput[0]))) { |
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/* |
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* Nice is available - default niceness (+10) |
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* https://www.lifewire.com/uses-of-commands-nice-renice-2201087 |
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* https://www.computerhope.com/unix/unice.htm |
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*/ |
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return true; |
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} |
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return false; |
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} |
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} |
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/** |
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* @return bool|mixed |
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*/ |
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public function convert() |
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{ |
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try { |
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$this->checkRequirements(); |
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// Preparing array holding possible binaries |
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$binaries = $this->setUpBinaries(); |
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} catch (Exception $e) { |
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return false; |
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} |
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// lossless PNG conversion |
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$lossless = ( $this->extension == 'png' ? '-lossless' : '' ); |
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// Metadata (all, exif, icc, xmp or none (default)) |
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$metadata = ( $this->strip ? '-metadata none' : '-metadata all' ); |
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$optionsArray = [ $lossless, '-q ' . $this->quality, '-m 6', $metadata, '-low_memory', |
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$this->escapeFilename($this->source), '-o ' . $this->escapeFilename($this->destination), '2>&1', |
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]; |
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$options = implode(' ', array_filter($optionsArray)); |
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$nice = ( $this->hasNiceSupport() ? 'nice' : '' ); |
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return $this->toConvert($binaries, $nice, $options); |
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} |
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/** |
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* @param array $binaries |
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* @param string $nice |
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* @param string $options |
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* @return bool |
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*/ |
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private function toConvert(array $binaries, string $nice, string $options) |
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{ |
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$success = false; |
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// Try all paths |
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foreach ($binaries as $index => $binary) { |
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$command = $nice . ' ' . $binary . ' ' . $options; |
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exec($command, $result, $returnCode); |
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if ($returnCode == 0) { // Everything okay! |
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// cwebp sets file permissions to 664 but instead .. |
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$fileStatistics = stat(dirname($this->destination)); |
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// Apply same permissions as parent folder but strip off the executable bits |
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$permissions = $fileStatistics['mode'] & 0000666; |
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chmod($this->destination, $permissions); |
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$success = true; |
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break; |
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} |
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} |
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return $success; |
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} |
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} |
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whallysson /
conveter-php-webp
