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<?php |
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namespace Staticus\Resources\Commands; |
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use League\Flysystem\FilesystemInterface; |
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use Staticus\Resources\Exceptions\CommandErrorException; |
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use Staticus\Resources\ResourceDOInterface; |
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class DestroyEqualResourceCommand implements ResourceCommandInterface |
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{ |
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const HASH_ALGORITHM = 'md5'; |
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/** |
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* @var ResourceDOInterface |
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*/ |
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protected $originResourceDO; |
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/** |
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* @var ResourceDOInterface |
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*/ |
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protected $suspectResourceDO; |
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/** |
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* @var FilesystemInterface |
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*/ |
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protected $filesystem; |
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/** |
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* @param ResourceDOInterface $originResourceDO This is a model resource for comparing |
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* @param ResourceDOInterface $suspectResourceDO This resource will be deleted, if it's equal to $originResourceDO |
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* @param FilesystemInterface $filesystem |
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*/ |
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public function __construct( |
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ResourceDOInterface $originResourceDO |
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, ResourceDOInterface $suspectResourceDO |
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, FilesystemInterface $filesystem |
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) |
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{ |
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$this->originResourceDO = $originResourceDO; |
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$this->suspectResourceDO = $suspectResourceDO; |
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$this->filesystem = $filesystem; |
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} |
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/** |
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* @return ResourceDOInterface SuspectResource if it have been deleted or OriginResource if the Suspect is not equal |
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*/ |
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public function __invoke() |
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{ |
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$originName = $this->originResourceDO->getName(); |
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$suspectName = $this->suspectResourceDO->getName(); |
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$originType = $this->originResourceDO->getType(); |
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$suspectType = $this->suspectResourceDO->getType(); |
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$originFilePath = $this->originResourceDO->getFilePath(); |
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$suspectFilePath = $this->suspectResourceDO->getFilePath(); |
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if (!$originName || !$originType) { |
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throw new CommandErrorException('Cannot destroy equal resource: the origin resource is empty'); |
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} |
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if (!$suspectName || !$suspectType) { |
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throw new CommandErrorException('Cannot destroy equal resource: the suspect resource is empty'); |
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} |
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if ($originFilePath === $suspectFilePath) { |
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throw new CommandErrorException('Cannot destroy equal resource: Origin and Suspect have same paths'); |
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} |
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// Unfortunately, this condition can not always work fine. |
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// Because some Middlewares can compress, resize etc. the resource that saved before |
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// and the second uploaded copy will never be equal |
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if ($originType === $suspectType |
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&& $this->filesystem->has($originFilePath) === $this->filesystem->has($suspectFilePath) |
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&& $this->filesystem->getSize($originFilePath) === $this->filesystem->getSize($suspectFilePath) |
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&& $this->getFileHash($originFilePath) === $this->getFileHash($suspectFilePath) |
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) { |
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$command = new DestroyResourceCommand($this->suspectResourceDO, $this->filesystem); |
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return $command(true); |
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} |
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return $this->originResourceDO; |
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} |
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public function getFileHash($path) |
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{ |
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$stream = $this->filesystem->readStream($path); |
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if ($stream !== false) { |
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$context = hash_init(self::HASH_ALGORITHM); |
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hash_update_stream($context, $stream); |
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return hash_final($context); |
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} |
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return false; |
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} |
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} |
KIVagant /
staticus-core
