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Editing: class-social-admin.php

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<?php
/**
 * WPSEO plugin file.
 *
 * @package WPSEO\Admin
 */

/**
 * This class adds the Social tab to the Yoast SEO metabox and makes sure the settings are saved.
 */
class WPSEO_Social_Admin extends WPSEO_Metabox {

/**
	 * Class constructor.
	 */
	public function __construct() {
		self::translate_meta_boxes();
		add_filter( 'wpseo_save_metaboxes', [ $this, 'save_meta_boxes' ], 10, 1 );
		add_action( 'wpseo_save_compare_data', [ $this, 'og_data_compare' ], 10, 1 );
	}

/**
	 * Translate text strings for use in the meta box.
	 *
	 * IMPORTANT: if you want to add a new string (option) somewhere, make sure you add that array key to
	 * the main meta box definition array in the class WPSEO_Meta() as well!!!!
	 */
	public static function translate_meta_boxes() {
		/* translators: %s expands to the social network's name. */
		$title_text = __( 'If you don\'t want to use the post title for sharing the post on %s but instead want another title there, write it here.', 'wordpress-seo' );

/* translators: %s expands to the social network's name. */
		$description_text = __( 'If you don\'t want to use the meta description for sharing the post on %s but want another description there, write it here.', 'wordpress-seo' );

/* translators: %s expands to the social network's name. */
		$image_text = __( 'If you want to override the image used on %s for this post, upload / choose an image here.', 'wordpress-seo' );

/* translators: %1$s expands to the social network, %2$s to the recommended image size. */
		$image_size_text = __( 'The recommended image size for %1$s is %2$s pixels.', 'wordpress-seo' );

$social_networks = [
			'opengraph' => __( 'Facebook', 'wordpress-seo' ),
			'twitter'   => __( 'Twitter', 'wordpress-seo' ),
		];

// Source: https://blog.bufferapp.com/ideal-image-sizes-social-media-posts.
		$recommended_image_sizes = [
			/* translators: %1$s expands to the image recommended width, %2$s to its height. */
			'opengraph' => sprintf( __( '%1$s by %2$s', 'wordpress-seo' ), '1200', '630' ),
			// Source: https://developers.facebook.com/docs/sharing/best-practices#images.
			/* translators: %1$s expands to the image recommended width, %2$s to its height. */
			'twitter'   => sprintf( __( '%1$s by %2$s', 'wordpress-seo' ), '1024', '512' ),
		];

foreach ( $social_networks as $network => $label ) {
			if ( WPSEO_Options::get( $network, false ) === true ) {
				/* translators: %s expands to the name of a social network. */
				WPSEO_Meta::$meta_fields['social'][ $network . '-title' ]['title']       = sprintf( __( '%s Title', 'wordpress-seo' ), $label );
				WPSEO_Meta::$meta_fields['social'][ $network . '-title' ]['description'] = sprintf( $title_text, $label );

/* translators: %s expands to the name of a social network. */
				WPSEO_Meta::$meta_fields['social'][ $network . '-description' ]['title']       = sprintf( __( '%s Description', 'wordpress-seo' ), $label );
				WPSEO_Meta::$meta_fields['social'][ $network . '-description' ]['description'] = sprintf( $description_text, $label );

/* translators: %s expands to the name of a social network. */
				WPSEO_Meta::$meta_fields['social'][ $network . '-image' ]['title']       = sprintf( __( '%s Image', 'wordpress-seo' ), $label );
				WPSEO_Meta::$meta_fields['social'][ $network . '-image' ]['description'] = sprintf( $image_text, $label ) . ' ' . sprintf( $image_size_text, $label, $recommended_image_sizes[ $network ] );
			}
		}
	}

/**
	 * Returns the metabox section for the social settings.
	 *
	 * @return WPSEO_Metabox_Collapsibles_Sections
	 */
	public function get_meta_section() {
		$tabs               = [];
		$social_meta_fields = WPSEO_Meta::get_meta_field_defs( 'social' );

$opengraph = WPSEO_Options::get( 'opengraph' );
		$twitter   = WPSEO_Options::get( 'twitter' );

if ( $opengraph === true && $twitter === true ) {
			$single = null;
		}

wp_nonce_field( 'yoast_free_metabox_social', 'yoast_free_metabox_social_nonce' );

if ( $opengraph === true ) {
			$tabs[] = new WPSEO_Metabox_Collapsible(
				'facebook',
				$this->get_social_tab_content( 'opengraph', $social_meta_fields ),
				__( 'Facebook', 'wordpress-seo' )
			);
		}

if ( $twitter === true ) {
			$tabs[] = new WPSEO_Metabox_Collapsible(
				'twitter',
				$this->get_social_tab_content( 'twitter', $social_meta_fields ),
				__( 'Twitter', 'wordpress-seo' )
			);
		}

return new WPSEO_Metabox_Collapsibles_Sections(
			'social',
			'<span class="dashicons dashicons-share"></span>' . __( 'Social', 'wordpress-seo' ),
			$tabs
		);
	}

/**
	 * Generates the html for a social settings tab for one of the supported social media.
	 *
	 * @param string $medium          Medium. Can be 'opengraph' or 'twitter'.
	 * @param array  $meta_field_defs The social meta field definitions.
	 *
	 * @return string
	 */
	private function get_social_tab_content( $medium, $meta_field_defs ) {
		$field_names = [
			$medium . '-title',
			$medium . '-description',
			$medium . '-image',
			$medium . '-image-id',
		];

$tab_content = $this->get_premium_notice( $medium );

foreach ( $field_names as $field_name ) {
			$tab_content .= $this->do_meta_box( $meta_field_defs[ $field_name ], $field_name );
		}

/**
		 * If premium hide the form to show the social preview instead, we still need the fields to be output because
		 * the values of the social preview are saved in the hidden field.
		 */
		$features = new WPSEO_Features();
		if ( $features->is_premium() ) {
			return $this->hide_form( $tab_content );
		}

return $tab_content;
	}

/**
	 * Hides the given output when rendered to HTML.
	 *
	 * @param string $tab_content The social tab content.
	 *
	 * @return string The content.
	 */
	private function hide_form( $tab_content ) {
		return '<div class="hidden">' . $tab_content . '</div>';
	}

/**
	 * Returns the Upgrade to Premium notice.
	 *
	 * @param string $network The social network.
	 *
	 * @return string The notice HTML on the free version, empty string on premium.
	 */
	public function get_premium_notice( $network ) {
		$features = new WPSEO_Features();
		if ( $features->is_premium() ) {
			return '';
		}

$network_name = __( 'Facebook', 'wordpress-seo' );

if ( $network === 'twitter' ) {
			$network_name = __( 'Twitter', 'wordpress-seo' );
		}

return sprintf(
			'<div class="notice inline yoast-notice yoast-notice-go-premium">
				<p>%1$s</p>
				<p><a href="%2$s" target="_blank">%3$s</a></p>
			</div>',
			sprintf(
				/* translators: %1$s expands to the social network's name, %2$s to Yoast SEO Premium. */
				esc_html__( 'Do you want to preview what it will look like if people share this post on %1$s? You can, with %2$s.', 'wordpress-seo' ),
				esc_html( $network_name ),
				'<strong>Yoast SEO Premium</strong>'
			),
			esc_url( WPSEO_Shortlinker::get( 'https://yoa.st/179' ) ),
			sprintf(
				/* translators: %s expands to Yoast SEO Premium. */
				esc_html__( 'Find out why you should upgrade to %s', 'wordpress-seo' ),
				'Yoast SEO Premium'
			)
		);
	}

/**
	 * Filter over the meta boxes to save, this function adds the Social meta boxes.
	 *
	 * @param array $field_defs Array of metaboxes to save.
	 *
	 * @return array
	 */
	public function save_meta_boxes( $field_defs ) {
		if ( ! isset( $_POST['yoast_free_metabox_social_nonce'] ) || ! wp_verify_nonce( $_POST['yoast_free_metabox_social_nonce'], 'yoast_free_metabox_social' ) ) {
			return $field_defs;
		}

return array_merge( $field_defs, WPSEO_Meta::get_meta_field_defs( 'social' ) );
	}

/**
	 * This method will compare opengraph fields with the posted values.
	 *
	 * When fields are changed, the facebook cache will be purged.
	 *
	 * @param WP_Post $post Post instance.
	 */
	public function og_data_compare( $post ) {
		if ( empty( $_POST ) ) {
			return;
		}

if ( empty( $post->ID ) || $post->post_status !== 'publish' ) {
			return;
		}

if ( ! isset( $_POST['yoast_free_metabox_social_nonce'] ) || ! wp_verify_nonce( $_POST['yoast_free_metabox_social_nonce'], 'yoast_free_metabox_social' ) ) {
			return;
		}

if ( ! isset( $_POST['original_post_status'] ) || $_POST['original_post_status'] !== 'publish' ) {
			return;
		}

$fields_to_compare = [
			'opengraph-title',
			'opengraph-description',
			'opengraph-image',
		];

$reset_facebook_cache = false;

foreach ( $fields_to_compare as $field_to_compare ) {
			$old_value = WPSEO_Meta::get_value( $field_to_compare, $post->ID );

$new_value = '';
			$post_key  = WPSEO_Meta::$form_prefix . $field_to_compare;
			if ( isset( $_POST[ $post_key ] ) ) {
				$new_value = sanitize_text_field( wp_unslash( $_POST[ $post_key ] ) );
			}

if ( $old_value !== $new_value ) {
				$reset_facebook_cache = true;
				break;
			}
		}
		unset( $old_value, $new_value );

if ( $reset_facebook_cache ) {
			wp_remote_get(
				'https://graph.facebook.com/?id=' . get_permalink( $post->ID ) . '&scrape=true&method=post'
			);
		}
	}
} /* End of class */

Editing: class-social-admin.php

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