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<?php namespace App\Generator; |
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use App\Entity\BaseWork; |
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use InvalidArgumentException; |
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use Symfony\Component\DependencyInjection\ParameterBag\ParameterBag; |
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use Symfony\Component\Filesystem\Filesystem; |
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class EpubConverter { |
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private const SUPPORTED_FORMATS = [ |
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BaseWork::FORMAT_MOBI, |
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BaseWork::FORMAT_PDF, |
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]; |
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/** @var ParameterBag */ |
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private $parameters; |
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/** @var string */ |
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private $cacheDir; |
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public function __construct(ParameterBag $parameters, string $cacheDir) { |
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$this->parameters = $parameters; |
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$this->cacheDir = $cacheDir; |
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} |
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public function convert(string $epubUrl, string $targetFormat): string { |
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$this->assertUrl($epubUrl); |
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$this->assertSupportedTargetFormat($targetFormat); |
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$this->assertEnabledTargetFormat($targetFormat); |
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$commandTemplate = $this->parameters->get("{$targetFormat}_converter_command"); |
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if (empty($commandTemplate)) { |
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throw new InvalidArgumentException("The target format '{$targetFormat}' does not have a shell converter command."); |
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} |
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$cachedOutputFileStore = new CachedOutputFileStore($this->cacheDir, $epubUrl, $targetFormat); |
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$cachedOutputFile = $cachedOutputFileStore->get(); |
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if ($cachedOutputFile) { |
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return $cachedOutputFile; |
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} |
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$epubFile = $this->downloadEpub($epubUrl); |
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$epubFile->saveAt($this->cacheDir); |
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$outputFile = $this->convertFile($commandTemplate, $epubFile->path, $targetFormat); |
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$cachedOutputFileStore->set($outputFile); |
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return $outputFile; |
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} |
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private function convertFile(string $commandTemplate, string $inputFile, string $outputFormat): string { |
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$outputFile = str_replace('.epub', ".$outputFormat", $inputFile); |
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$command = strtr($commandTemplate, [ |
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'INPUT_FILE' => escapeshellarg($inputFile), |
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'OUTPUT_FILE' => escapeshellarg($outputFile), |
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'OUTPUT_FILE_BASENAME' => escapeshellarg(basename($outputFile)), |
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]); |
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$binDir = realpath(__DIR__.'/../../bin'); |
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chdir($binDir);// go to local bin directory to allow execution of locally stored binaries |
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$execPath = getenv('PATH'); |
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$extendPath = $execPath ? 'PATH=.:$PATH' : ''; |
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$commandWithCustomPath = trim("$extendPath $command"); |
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shell_exec($commandWithCustomPath); |
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return $outputFile; |
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} |
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private function downloadEpub(string $epubUrl) { |
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$stream = fopen($this->sanitizeSource($epubUrl), 'r'); |
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$headers = stream_get_meta_data($stream)['wrapper_data']; |
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$contents = stream_get_contents($stream); |
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fclose($stream); |
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$epubFile = $this->getFileNameFromHeaders($headers) ?: basename($epubUrl); |
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return new DownloadedFile($epubFile, $contents); |
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} |
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/* |
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* Example headers: |
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* - Location: /cache/dl/file.epub |
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* - Content-Disposition: attachment; filename="file.epub" |
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*/ |
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private function getFileNameFromHeaders(array $headers): string { |
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foreach (array_reverse($headers) as $header) { |
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$parts = explode(':', $header); |
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$name = strtolower(trim($parts[0])); |
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switch ($name) { |
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case 'content-disposition': |
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$normalizedValue = strtr($parts[1], [' ' => '', '"' => '', "'" => '']) . ';'; |
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if (preg_match('#filename=([^;]+)#', $normalizedValue, $matches)) { |
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return basename($matches[1]); |
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} |
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return ''; |
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case 'location': |
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return basename(trim($parts[1])); |
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} |
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} |
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return ''; |
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} |
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private function assertUrl(string $urlToAssert) { |
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if ( ! preg_match('#^https?://#', $urlToAssert)) { |
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throw new InvalidArgumentException("Not a valid URL: '{$urlToAssert}'"); |
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} |
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} |
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private function assertSupportedTargetFormat(string $targetFormat) { |
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if ( ! in_array($targetFormat, self::SUPPORTED_FORMATS)) { |
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throw new InvalidArgumentException("Unsupported target format: '{$targetFormat}'"); |
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} |
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} |
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private function assertEnabledTargetFormat(string $targetFormat) { |
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$key = "{$targetFormat}_download_enabled"; |
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if ( ! $this->parameters->get($key)) { |
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throw new InvalidArgumentException("Target format is not enabled: '{$targetFormat}'"); |
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} |
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} |
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private function sanitizeSource(string $source): string { |
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return preg_replace('#[^a-zA-Z\d:/.,_-]#', '', $source); |
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} |
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} |
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class DownloadedFile { |
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public $name; |
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public $contents; |
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public $path; |
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public function __construct($name, $contents) { |
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$this->name = $name; |
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$this->contents = $contents; |
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} |
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public function saveAt(string $directory) { |
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$this->path = "$directory/$this->name"; |
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$fs = new Filesystem(); |
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$fs->dumpFile($this->path, $this->contents); |
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} |
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} |
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class CachedOutputFileStore { |
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private $store; |
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private $fs; |
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public function __construct(string $cacheDir, string $sourceUrl, string $outputFormat) { |
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$this->store = "$cacheDir/$outputFormat-".md5($sourceUrl).'.file'; |
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$this->fs = new Filesystem(); |
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} |
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public function get(): ?string { |
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if ( ! $this->fs->exists($this->store)) { |
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return null; |
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} |
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$cachedOutputFile = trim(file_get_contents($this->store)); |
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if ( ! $this->fs->exists($cachedOutputFile)) { |
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return null; |
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} |
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$this->fs->touch($cachedOutputFile); |
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return $cachedOutputFile; |
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} |
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public function set(string $outputFile) { |
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$this->fs->dumpFile($this->store, $outputFile); |
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} |
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} |
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chitanka /
chitanka
