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<?php |
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namespace PiedWeb\UrlHarvester; |
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use Spatie\Robots\RobotsTxt; |
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use Spatie\Robots\RobotsHeaders; |
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use PiedWeb\Curl\Request; |
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class Indexable |
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{ |
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// https://stackoverflow.com/questions/1880148/how-to-get-name-of-the-constant |
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const INDEXABLE = 0; |
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const NOT_INDEXABLE_ROBOTS = 1; |
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const NOT_INDEXABLE_HEADER = 2; |
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const NOT_INDEXABLE_META = 3; |
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const NOT_INDEXABLE_CANONICAL = 4; |
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const NOT_INDEXABLE_4XX = 5; |
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const NOT_INDEXABLE_5XX = 6; |
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const NOT_INDEXABLE_NETWORK_ERROR = 7; |
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const NOT_INDEXABLE_3XX = 8; |
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const NOT_INDEXABLE_NOT_HTML = 9; |
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/** @var Harvest */ |
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protected $harvest; |
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/** @var string */ |
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protected $isIndexableFor; |
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public function __construct(Harvest $harvest, string $isIndexableFor = 'googlebot') |
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{ |
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$this->harvest = $harvest; |
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$this->isIndexableFor = $isIndexableFor; |
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} |
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public function robotsTxtAllows() |
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{ |
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$url = $this->harvest->getResponse()->getUrl(); |
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$robotsTxt = $this->harvest->getRobotsTxt(); |
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return '' === $robotsTxt ? true : $robotsTxt->allows($url, $this->isIndexableFor); |
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} |
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public function metaAllows() |
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{ |
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$meta = $this->harvest->getMeta($this->isIndexableFor); |
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$generic = $this->harvest->getMeta('robots'); |
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return ! (false !== stripos($meta, 'noindex') || false !== stripos($generic, 'noindex')); |
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} |
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public function headersAllow() |
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{ |
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$headers = explode(PHP_EOL, $this->harvest->getResponse()->getHeaders(false)); |
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return RobotsHeaders::create($headers)->mayIndex($this->isIndexableFor); |
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} |
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/** |
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* @return int |
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*/ |
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public static function isIndexable(Harvest $harvest, string $isIndexableFor = 'googlebot') |
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{ |
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$self = new self($harvest, $isIndexableFor); |
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// robots |
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if (!$self->robotsTxtAllows()) { |
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return self::NOT_INDEXABLE_ROBOTS; |
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} |
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if ($self->headersAllow()) { |
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return self::NOT_INDEXABLE_HEADER; |
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} |
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if ($self->metaAllows()) { |
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return self::NOT_INDEXABLE_META; |
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} |
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// canonical |
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if (!$harvest->isCanonicalCorrect()) { |
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return self::NOT_INDEXABLE_CANONICAL; |
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} |
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$statusCode = $harvest->getResponse()->getStatusCode(); |
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// status 4XX |
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if ($statusCode < 500 && $statusCode > 399) { |
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return self::NOT_INDEXABLE_5XX; |
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} |
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// status 5XX |
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if ($statusCode < 600 && $statusCode > 499) { |
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return self::NOT_INDEXABLE_5XX; |
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} |
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// status 3XX |
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if ($statusCode < 400 && $statusCode > 299) { |
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return self::NOT_INDEXABLE_3XX; |
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} |
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return self::INDEXABLE; |
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} |
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} |
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PiedWeb /
UrlHarvester
Let?s assume that you have a directory layout like this:
. |-- OtherDir | |-- Bar.php | `-- Foo.php `-- SomeDir `-- Foo.phpand let?s assume the following content of
Bar.php:If both files
OtherDir/Foo.phpandSomeDir/Foo.phpare loaded in the same runtime, you will see a PHP error such as the following:PHP Fatal error: Cannot use SomeDir\Foo as Foo because the name is already in use in OtherDir/Foo.phpHowever, as
OtherDir/Foo.phpdoes not necessarily have to be loaded and the error is only triggered if it is loaded beforeOtherDir/Bar.php, this problem might go unnoticed for a while. In order to prevent this error from surfacing, you must import the namespace with a different alias: