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<?php |
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namespace XmlResourceRetriever; |
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use XmlResourceRetriever\Downloader\DownloaderInterface; |
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use XmlResourceRetriever\Downloader\PhpDownloader; |
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/** |
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* This is an abstract base imlementation of RetrieverInterface |
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* |
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* It contains basic helper functions and implement for construct, getters, setters, history, buildPath and download |
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* There are other type of resources that could be retrieved and might use all this logic |
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*/ |
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abstract class AbstractBaseRetriever implements RetrieverInterface |
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{ |
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/** @var string */ |
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private $basePath; |
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/** @var DownloaderInterface */ |
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private $downloader; |
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/** |
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* This variable stores the list of retrieved resources to avoid infinite recursion |
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* @var array |
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*/ |
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private $history = []; |
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/** |
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* This method checks if the recently downloaded file from $source located at $path |
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* is a valid resource, if not will remove the file and throw an exception |
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* |
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* @param string $source |
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* @param string $localpath |
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* @throws \RuntimeException when the source is not valid |
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*/ |
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abstract protected function checkIsValidDownloadedFile(string $source, string $localpath); |
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/** |
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* Retriever constructor. |
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* |
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* @param string $basePath |
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* @param DownloaderInterface $downloader |
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*/ |
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public function __construct($basePath, DownloaderInterface $downloader = null) |
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{ |
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$this->basePath = $basePath; |
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$this->setDownloader($downloader ? : new PhpDownloader()); |
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} |
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public function getBasePath(): string |
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{ |
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return $this->basePath; |
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} |
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public function getDownloader(): DownloaderInterface |
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{ |
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return $this->downloader; |
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} |
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public function setDownloader(DownloaderInterface $downloader) |
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{ |
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$this->downloader = $downloader; |
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} |
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public function buildPath(string $url): string |
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{ |
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if (false === $parts = $this->urlParts($url)) { |
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throw new \InvalidArgumentException("Invalid URL: $url"); |
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} |
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return $this->basePath . '/' . $parts['host'] . '/' . ltrim($parts['path'], '/'); |
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} |
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public function download(string $resource): string |
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{ |
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// validate resource |
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if ('' === $resource) { |
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throw new \UnexpectedValueException('The argument to download is empty'); |
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} |
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// set destination |
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$localPath = $this->buildPath($resource); |
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// create local path |
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$dirname = dirname($localPath); |
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if (! is_dir($dirname) && ! @mkdir($dirname, 0777, true)) { |
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throw new \RuntimeException("Unable to create directory $dirname"); |
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} |
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// download the file into its final destination |
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$this->downloader->downloadTo($resource, $localPath); |
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// check content is valid |
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$this->checkIsValidDownloadedFile($resource, $localPath); |
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return $localPath; |
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} |
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public function retrieveHistory(): array |
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{ |
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return $this->history; |
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} |
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protected function clearHistory() |
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{ |
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$this->history = []; |
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} |
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protected function addToHistory(string $source, string $localpath) |
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{ |
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$this->history[$source] = $localpath; |
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} |
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protected function urlParts(string $url) |
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{ |
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$options = FILTER_FLAG_SCHEME_REQUIRED | FILTER_FLAG_HOST_REQUIRED | FILTER_FLAG_PATH_REQUIRED; |
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if (false === filter_var($url, FILTER_VALIDATE_URL, $options)) { |
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return false; |
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} |
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return parse_url($url); |
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} |
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} |
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eclipxe13 /
XmlResourceRetriever
