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namespace Yoast\WP\SEO\Helpers;

use WPSEO_Image_Utils;
use Yoast\WP\SEO\Models\SEO_Links;
use Yoast\WP\SEO\Repositories\Indexable_Repository;
use Yoast\WP\SEO\Repositories\SEO_Links_Repository;

/**
 * A helper object for images.
 */
class Image_Helper {

	/**
	 * Image types that are supported by Open Graph.
	 *
	 * @var array
	 */
	protected static $valid_image_types = [ 'image/jpeg', 'image/gif', 'image/png', 'image/webp' ];

	/**
	 * Image extensions that are supported by Open Graph.
	 *
	 * @var array
	 */
	protected static $valid_image_extensions = [ 'jpeg', 'jpg', 'gif', 'png', 'webp' ];

	/**
	 * Represents the indexables repository.
	 *
	 * @var Indexable_Repository
	 */
	protected $indexable_repository;

	/**
	 * Represents the SEO Links repository.
	 *
	 * @var SEO_Links_Repository
	 */
	protected $seo_links_repository;

	/**
	 * The options helper.
	 *
	 * @var Options_Helper
	 */
	private $options_helper;

	/**
	 * The URL helper.
	 *
	 * @var Url_Helper
	 */
	private $url_helper;

	/**
	 * Image_Helper constructor.
	 *
	 * @param Indexable_Repository $indexable_repository The indexable repository.
	 * @param SEO_Links_Repository $seo_links_repository The SEO Links repository.
	 * @param Options_Helper       $options              The options helper.
	 * @param Url_Helper           $url_helper           The URL helper.
	 */
	public function __construct(
		Indexable_Repository $indexable_repository,
		SEO_Links_Repository $seo_links_repository,
		Options_Helper $options,
		Url_Helper $url_helper
	) {
		$this-&gt;indexable_repository = $indexable_repository;
		$this-&gt;seo_links_repository = $seo_links_repository;
		$this-&gt;options_helper       = $options;
		$this-&gt;url_helper           = $url_helper;
	}

	/**
	 * Determines whether or not the wanted attachment is considered valid.
	 *
	 * @param int $attachment_id The attachment ID to get the attachment by.
	 *
	 * @return bool Whether or not the attachment is valid.
	 */
	public function is_valid_attachment( $attachment_id ) {
		if ( ! \wp_attachment_is_image( $attachment_id ) ) {
			return false;
		}

		$post_mime_type = \get_post_mime_type( $attachment_id );
		if ( $post_mime_type === false ) {
			return false;
		}

		return $this-&gt;is_valid_image_type( $post_mime_type );
	}

	/**
	 * Checks if the given extension is a valid extension
	 *
	 * @param string $image_extension The image extension.
	 *
	 * @return bool True when valid.
	 */
	public function is_extension_valid( $image_extension ) {
		return \in_array( $image_extension, static::$valid_image_extensions, true );
	}

	/**
	 * Determines whether the passed mime type is a valid image type.
	 *
	 * @param string $mime_type The detected mime type.
	 *
	 * @return bool Whether or not the attachment is a valid image type.
	 */
	public function is_valid_image_type( $mime_type ) {
		return \in_array( $mime_type, static::$valid_image_types, true );
	}

	/**
	 * Retrieves the image source for an attachment.
	 *
	 * @param int    $attachment_id The attachment.
	 * @param string $image_size    The image size to retrieve.
	 *
	 * @return string The image url or an empty string when not found.
	 */
	public function get_attachment_image_source( $attachment_id, $image_size = 'full' ) {
		$attachment = \wp_get_attachment_image_src( $attachment_id, $image_size );

		if ( ! $attachment ) {
			return '';
		}

		return $attachment[0];
	}

	/**
	 * Retrieves the ID of the featured image.
	 *
	 * @param int $post_id The post id to get featured image id for.
	 *
	 * @return int|bool ID when found, false when not.
	 */
	public function get_featured_image_id( $post_id ) {
		if ( ! \has_post_thumbnail( $post_id ) ) {
			return false;
		}

		return \get_post_thumbnail_id( $post_id );
	}

	/**
	 * Gets the image url from the content.
	 *
	 * @param int $post_id The post id to extract the images from.
	 *
	 * @return string The image url or an empty string when not found.
	 */
	public function get_post_content_image( $post_id ) {
		$image_url = $this-&gt;get_first_usable_content_image_for_post( $post_id );

		if ( $image_url === null ) {
			return '';
		}

		return $image_url;
	}

	/**
	 * Gets the first image url of a gallery.
	 *
	 * @param int $post_id Post ID to use.
	 *
	 * @return string The image url or an empty string when not found.
	 */
	public function get_gallery_image( $post_id ) {
		$post = \get_post( $post_id );
		if ( \strpos( $post-&gt;post_content, '[gallery' ) === false ) {
			return '';
		}

		$images = \get_post_gallery_images( $post );
		if ( empty( $images ) ) {
			return '';
		}

		return \reset( $images );
	}

	/**
	 * Gets the image url from the term content.
	 *
	 * @param int $term_id The term id to extract the images from.
	 *
	 * @return string The image url or an empty string when not found.
	 */
	public function get_term_content_image( $term_id ) {
		$image_url = $this-&gt;get_first_content_image_for_term( $term_id );

		if ( $image_url === null ) {
			return '';
		}

		return $image_url;
	}

	/**
	 * Retrieves the caption for an attachment.
	 *
	 * @param int $attachment_id Attachment ID.
	 *
	 * @return string The caption when found, empty string when no caption is found.
	 */
	public function get_caption( $attachment_id ) {
		$caption = \wp_get_attachment_caption( $attachment_id );
		if ( ! empty( $caption ) ) {
			return $caption;
		}

		$caption = \get_post_meta( $attachment_id, '_wp_attachment_image_alt', true );
		if ( ! empty( $caption ) ) {
			return $caption;
		}

		return '';
	}

	/**
	 * Retrieves the attachment metadata.
	 *
	 * @param int $attachment_id Attachment ID.
	 *
	 * @return array The metadata, empty array when no metadata is found.
	 */
	public function get_metadata( $attachment_id ) {
		$metadata = \wp_get_attachment_metadata( $attachment_id );
		if ( ! $metadata || ! \is_array( $metadata ) ) {
			return [];
		}

		return $metadata;
	}

	/**
	 * Retrieves the attachment image url.
	 *
	 * @param int    $attachment_id Attachment ID.
	 * @param string $size          The size to get.
	 *
	 * @return string The url when found, empty string otherwise.
	 */
	public function get_attachment_image_url( $attachment_id, $size ) {
		$url = \wp_get_attachment_image_url( $attachment_id, $size );
		if ( ! $url ) {
			return '';
		}

		return $url;
	}

	/**
	 * Find the right version of an image based on size.
	 *
	 * @codeCoverageIgnore - We have to write test when this method contains own code.
	 *
	 * @param int    $attachment_id Attachment ID.
	 * @param string $size          Size name.
	 *
	 * @return array|false Returns an array with image data on success, false on failure.
	 */
	public function get_image( $attachment_id, $size ) {
		return WPSEO_Image_Utils::get_image( $attachment_id, $size );
	}

	/**
	 * Retrieves the best attachment variation for the given attachment.
	 *
	 * @codeCoverageIgnore - We have to write test when this method contains own code.
	 *
	 * @param int $attachment_id The attachment id.
	 *
	 * @return bool|string The attachment url or false when no variations found.
	 */
	public function get_best_attachment_variation( $attachment_id ) {
		$variations = WPSEO_Image_Utils::get_variations( $attachment_id );
		$variations = WPSEO_Image_Utils::filter_usable_file_size( $variations );

		// If we are left without variations, there is no valid variation for this attachment.
		if ( empty( $variations ) ) {
			return false;
		}

		// The variations are ordered so the first variations is by definition the best one.
		return \reset( $variations );
	}

	/**
	 * Find an attachment ID for a given URL.
	 *
	 * @param string $url            The URL to find the attachment for.
	 * @param bool   $use_link_table Whether the SEO Links table will be used to retrieve the id.
	 *
	 * @return int The found attachment ID, or 0 if none was found.
	 */
	public function get_attachment_by_url( $url, $use_link_table = true ) {
		// Don't try to do this for external URLs.
		if ( $this-&gt;url_helper-&gt;get_link_type( $url ) === SEO_Links::TYPE_EXTERNAL ) {
			return 0;
		}

		if ( ! $this-&gt;options_helper-&gt;get( 'disable-attachment' ) ) {
			// Strip out the size part of an image URL.
			$url = \preg_replace( '/(.*)-\d+x\d+\.(jpeg|jpg|png|gif)$/', '$1.$2', $url );

			$indexable = $this-&gt;indexable_repository-&gt;find_by_permalink( $url );

			if ( $indexable &amp;&amp; $indexable-&gt;object_type === 'post' &amp;&amp; $indexable-&gt;object_sub_type === 'attachment' ) {
				return $indexable-&gt;object_id;
			}

			$post_id = WPSEO_Image_Utils::get_attachment_by_url( $url );

			if ( $post_id !== 0 ) {
				// Find the indexable, this triggers creating it so it can be found next time.
				$this-&gt;indexable_repository-&gt;find_by_id_and_type( $post_id, 'post' );
			}

			return $post_id;
		}

		if ( ! $use_link_table ) {
			return WPSEO_Image_Utils::get_attachment_by_url( $url );
		}

		$link = $this-&gt;seo_links_repository-&gt;find_one_by_url( $url );
		if ( ! \is_a( $link, SEO_Links::class ) ) {
			return WPSEO_Image_Utils::get_attachment_by_url( $url );
		}

		return $link-&gt;target_post_id;
	}

	/**
	 * Retrieves an attachment ID for an image uploaded in the settings.
	 *
	 * Due to self::get_attachment_by_url returning 0 instead of false.
	 * 0 is also a possibility when no ID is available.
	 *
	 * @codeCoverageIgnore - We have to write test when this method contains own code.
	 *
	 * @param string $setting The setting the image is stored in.
	 *
	 * @return int|bool The attachment id, or false or 0 if no ID is available.
	 */
	public function get_attachment_id_from_settings( $setting ) {
		return WPSEO_Image_Utils::get_attachment_id_from_settings( $setting );
	}

	/**
	 * Based on and image ID return array with the best variation of that image. If it's not saved to the DB,  save it to an option.
	 *
	 * @param string $setting The setting name. Should be company or person.
	 *
	 * @return array|bool Array with image details when the image is found, boolean when it's not found.
	 */
	public function get_attachment_meta_from_settings( $setting ) {
		$image_meta = $this-&gt;options_helper-&gt;get( $setting . '_meta', false );
		if ( ! $image_meta ) {
			$image_id = $this-&gt;options_helper-&gt;get( $setting . '_id', false );
			if ( $image_id ) {
				// There is not an option to put a URL in an image field in the settings anymore, only to upload it through the media manager.
				// This means an attachment always exists, so doing this is only needed once.
				$image_meta = $this-&gt;get_best_attachment_variation( $image_id );
				if ( $image_meta ) {
					$this-&gt;options_helper-&gt;set( $setting . '_meta', $image_meta );
				}
			}
		}

		return $image_meta;
	}

	/**
	 * Retrieves the first usable content image for a post.
	 *
	 * @codeCoverageIgnore - We have to write test when this method contains own code.
	 *
	 * @param int $post_id The post id to extract the images from.
	 *
	 * @return string|null
	 */
	protected function get_first_usable_content_image_for_post( $post_id ) {
		return WPSEO_Image_Utils::get_first_usable_content_image_for_post( $post_id );
	}

	/**
	 * Gets the term's first usable content image. Null if none is available.
	 *
	 * @codeCoverageIgnore - We have to write test when this method contains own code.
	 *
	 * @param int $term_id The term id.
	 *
	 * @return string|null The image URL.
	 */
	protected function get_first_content_image_for_term( $term_id ) {
		return WPSEO_Image_Utils::get_first_content_image_for_term( $term_id );
	}
}
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