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<?php |
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namespace Spatie\Crawler; |
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use GuzzleHttp\Psr7\Uri; |
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use InvalidArgumentException; |
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use Psr\Http\Message\UriInterface; |
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use Symfony\Component\DomCrawler\Crawler as DomCrawler; |
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use Symfony\Component\DomCrawler\Link; |
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use Tree\Node\Node; |
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class LinkAdder |
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{ |
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/** @var \Spatie\Crawler\Crawler */ |
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protected $crawler; |
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public function __construct(Crawler $crawler) |
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{ |
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$this->crawler = $crawler; |
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} |
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public function addFromHtml(string $html, UriInterface $foundOnUrl) |
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{ |
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$allLinks = $this->extractLinksFromHtml($html, $foundOnUrl); |
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collect($allLinks) |
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->filter(function (UriInterface $url) { |
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return $this->hasCrawlableScheme($url); |
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}) |
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->map(function (UriInterface $url) { |
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return $this->normalizeUrl($url); |
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}) |
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->filter(function (UriInterface $url) use ($foundOnUrl) { |
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if (! $node = $this->crawler->addToDepthTree($url, $foundOnUrl)) { |
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return false; |
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} |
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return $this->shouldCrawl($node); |
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}) |
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->filter(function (UriInterface $url) { |
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return strpos($url->getPath(), '/tel:') === false; |
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}) |
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->each(function (UriInterface $url) use ($foundOnUrl) { |
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if ($this->crawler->maximumCrawlCountReached()) { |
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return; |
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} |
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$crawlUrl = CrawlUrl::create($url, $foundOnUrl); |
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$this->crawler->addToCrawlQueue($crawlUrl); |
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}); |
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} |
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/** |
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* @param string $html |
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* @param \Psr\Http\Message\UriInterface $foundOnUrl |
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* |
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* @return \Illuminate\Support\Collection|\Tightenco\Collect\Support\Collection|null |
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*/ |
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protected function extractLinksFromHtml(string $html, UriInterface $foundOnUrl) |
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{ |
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$domCrawler = new DomCrawler($html, $foundOnUrl); |
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return collect($domCrawler->filterXpath('//a | //link[@rel="next" or @rel="prev"]')->links()) |
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->reject(function (Link $link) { |
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return $link->getNode()->getAttribute('rel') === 'nofollow'; |
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}) |
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->map(function (Link $link) { |
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try { |
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return new Uri($link->getUri()); |
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} catch (InvalidArgumentException $exception) { |
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return; |
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} |
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}) |
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->filter(); |
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} |
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protected function hasCrawlableScheme(UriInterface $uri): bool |
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{ |
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return in_array($uri->getScheme(), ['http', 'https']); |
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} |
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protected function normalizeUrl(UriInterface $url): UriInterface |
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{ |
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return $url->withFragment(''); |
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} |
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protected function shouldCrawl(Node $node): bool |
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{ |
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if ($this->crawler->mustRespectRobots() && ! $this->crawler->getRobotsTxt()->allows($node->getValue(), $this->crawler->getUserAgent())) { |
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return false; |
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} |
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$maximumDepth = $this->crawler->getMaximumDepth(); |
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if (is_null($maximumDepth)) { |
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return true; |
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} |
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return $node->getDepth() <= $maximumDepth; |
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} |
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} |
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spatie /
crawler
