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<?php

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namespace Yoast\WP\SEO\Presenters\Twitter;

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use Yoast\WP\SEO\Presentations\Indexable_Presentation;

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use Yoast\WP\SEO\Presenters\Abstract_Indexable_Tag_Presenter;

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/**

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* Presenter class for the Twitter site tag.

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class Site_Presenter extends Abstract_Indexable_Tag_Presenter {

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/**

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* The tag key name.

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* @var string

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protected $key = 'twitter:site';

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/**

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* Run the Twitter site through the `wpseo_twitter_site` filter.

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* @return string The filtered Twitter site.

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public function get() {

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/**

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* Filter: 'wpseo_twitter_site' - Allow changing the Twitter site account as output in the Twitter card by Yoast SEO.

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* @param string $twitter_site Twitter site account string.

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* @param Indexable_Presentation $presentation The presentation of an indexable.

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$twitter_site = \apply_filters( 'wpseo_twitter_site', $this->presentation->twitter_site, $this->presentation );

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$twitter_site = $this->get_twitter_id( $twitter_site );

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if ( ! \is_string( $twitter_site ) || $twitter_site === '' ) {

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return '';

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}

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return '@' . $twitter_site;

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}

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/**

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* Checks if the given id is actually an id or a url and if url, distills the id from it.

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* Solves issues with filters returning urls and theme's/other plugins also adding a user meta

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* twitter field which expects url rather than an id (which is what we expect).

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* @param string $id Twitter ID or url.

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* @return string|bool Twitter ID or false if it failed to get a valid Twitter ID.

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private function get_twitter_id( $id ) {

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if ( \preg_match( '`([A-Za-z0-9_]{1,25})$`', $id, $match ) ) {

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return $match[1];

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}

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return false;

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}

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}

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