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<?php |
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/** |
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* This file is part of laravel.su package. |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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declare(strict_types=1); |
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namespace App\Services\DataProviders; |
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use Carbon\Carbon; |
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use GuzzleHttp\Client; |
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use Illuminate\Support\Collection; |
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use Symfony\Component\DomCrawler\Crawler; |
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/** |
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* Class LaravelNewsDataProvider. |
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*/ |
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class LaravelNewsDataProvider implements DataProviderInterface |
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{ |
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private const CONTENT_NAMESPACE = 'http://purl.org/rss/1.0/modules/content/'; |
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private const FEED_URL = 'https://feed.laravel-news.com'; |
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/** |
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* @var Client |
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*/ |
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private $client; |
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/** |
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* LaravelNewsDataProvider constructor. |
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* @param Client $client |
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*/ |
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public function __construct(Client $client) |
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{ |
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$this->client = $client; |
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} |
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/** |
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* @param \DateTime $latest |
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* @return Collection|ExternalArticle[] |
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* @throws \RuntimeException |
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*/ |
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public function getLatest(\DateTime $latest): Collection |
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{ |
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$result = new Collection(); |
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foreach ($this->getArticles() as $article) { |
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if ($article->getCreatedAt() < $latest) { |
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break; |
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} |
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$result->push($article); |
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} |
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return $result; |
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} |
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/** |
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* @return \Generator|ExternalArticle[] |
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* @throws \RuntimeException |
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*/ |
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private function getArticles(): \Generator |
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{ |
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$response = $this->client->get(self::FEED_URL); |
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$body = $response->getBody(); |
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yield from $this->parseBody((string)$body); |
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} |
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/** |
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* @param string $body |
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* @return \Generator |
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* @throws \RuntimeException |
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*/ |
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private function parseBody(string $body): \Generator |
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{ |
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$parser = new Crawler($body); |
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/** @var \DOMElement $node */ |
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foreach ($parser->filter('rss > channel > item') as $node) { |
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$parsed = $this->parseContent( |
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$node->getElementsByTagNameNS(self::CONTENT_NAMESPACE, '*') |
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->item(0) |
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->textContent |
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); |
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['images' => $images, 'body' => $content] = $parsed; |
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$article = new ExternalArticle( |
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(string)$this->getContentOf($node, 'title'), |
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trim($content), |
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(string)$this->getContentOf($node, 'link') |
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); |
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foreach ($images as $image) { |
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$article->addImageUrl($image); |
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} |
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$article->setCreatedAt(Carbon::parse( |
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(string)$this->getContentOf($node, 'pubDate') |
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)); |
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yield $article; |
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} |
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} |
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/** |
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* @param string $body |
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* @return array |
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*/ |
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private function parseContent(string $body): array |
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{ |
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$images = []; |
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$pattern = '/<img.+?src\s*=\s*"(.*?)".+?>/isu'; |
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preg_match_all($pattern, $body, $matches); |
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for ($i = 0, $len = count($matches[0]); $i < $len; $i++) { |
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$images[] = $matches[1][$i] ?? null; |
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$body = str_replace($matches[0][$i] ?? '', '', $body); |
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} |
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return ['images' => $images, 'body' => $body]; |
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} |
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/** |
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* @param \DOMElement $root |
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* @param string $tagName |
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* @return null|string |
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*/ |
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private function getContentOf(\DOMElement $root, string $tagName): ?string |
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{ |
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$node = $root->getElementsByTagName($tagName); |
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if ($node->length >= 1) { |
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return $node->item(0)->textContent; |
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} |
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return null; |
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} |
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} |
LaravelRUS /
laravel.ru
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This check marks access to variables or properties that have not been declared yet. While PHP has no explicit notion of declaring a variable, accessing it before a value is assigned to it is most likely a bug.