Merged in feature/from-pantheon (pull request #16)

code from pantheon

* code from pantheon

wp/wp-content/plugins/wordpress-seo-premium/classes/custom-fields-plugin.php

@@ -0,0 +1,115 @@
+<?php
+/**
+ * WPSEO Premium plugin file.
+ *
+ * @package WPSEO\Premium\Classes
+ */
+
+/**
+ * Enqueues a JavaScript plugin for YoastSEO.js that adds custom fields to the content that were defined in the titles
+ * and meta's section of the Yoast SEO settings when those fields are available.
+ */
+class WPSEO_Custom_Fields_Plugin implements WPSEO_WordPress_Integration {
+
+	/**
+	 * Initialize the AJAX hooks.
+	 *
+	 * @codeCoverageIgnore Method relies on dependencies.
+	 *
+	 * @return void
+	 */
+	public function register_hooks() {
+		global $pagenow;
+
+		if ( ! WPSEO_Metabox::is_post_edit( $pagenow ) && ! WPSEO_Metabox::is_post_overview( $pagenow ) ) {
+			return;
+		}
+
+		add_action( 'admin_enqueue_scripts', [ $this, 'enqueue' ] );
+	}
+
+	/**
+	 * Enqueues all the needed JS scripts.
+	 *
+	 * @codeCoverageIgnore Method relies on WordPress functions.
+	 *
+	 * @return void
+	 */
+	public function enqueue() {
+		wp_enqueue_script( 'wp-seo-premium-custom-fields-plugin' );
+		wp_localize_script( 'wp-seo-premium-custom-fields-plugin', 'YoastCustomFieldsPluginL10', $this->localize_script() );
+	}
+
+	/**
+	 * Loads the custom fields translations.
+	 *
+	 * @return array The fields to localize.
+	 */
+	public function localize_script() {
+		return [
+			'custom_field_names' => $this->get_custom_field_names(),
+		];
+	}
+
+	/**
+	 * Retrieve all custom field names set in SEO ->
+	 *
+	 * @return array The custom field names.
+	 */
+	protected function get_custom_field_names() {
+		$custom_field_names = [];
+
+		$post = $this->get_post();
+
+		if ( ! is_object( $post ) ) {
+			return $custom_field_names;
+		}
+
+		$options       = $this->get_titles_from_options();
+		$target_option = 'page-analyse-extra-' . $post->post_type;
+
+		if ( array_key_exists( $target_option, $options ) ) {
+			$custom_field_names = explode( ',', $options[ $target_option ] );
+		}
+
+		return $custom_field_names;
+	}
+
+	/**
+	 * Retrieves post data given a post ID or the global.
+	 *
+	 * @codeCoverageIgnore Method relies on dependencies.
+	 *
+	 * @return WP_Post|array|null Returns a post if found, otherwise returns an empty array.
+	 */
+	protected function get_post() {
+		// phpcs:disable WordPress.Security.NonceVerification.Recommended -- Reason: We are not controlling the request.
+		if ( isset( $_GET['post'] ) && is_string( $_GET['post'] ) ) {
+			// phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- Reason: We are casting the unsafe value to an integer.
+			$post_id = (int) wp_unslash( $_GET['post'] );
+			if ( $post_id > 0 ) {
+				return get_post( $post_id );
+			}
+		}
+		// phpcs:enable WordPress.Security.NonceVerification.Recommended
+
+		if ( isset( $GLOBALS['post'] ) ) {
+			return $GLOBALS['post'];
+		}
+
+		return [];
+	}
+
+	/**
+	 * Retrieves the value of the WPSEO_Titles option.
+	 *
+	 * @codeCoverageIgnore Method relies on the options.
+	 *
+	 * @return array The value from WPSEO_Titles option.
+	 */
+	protected function get_titles_from_options() {
+		$option_name = WPSEO_Options::get_option_instance( 'wpseo_titles' )->option_name;
+
+		return get_option( $option_name, [] );
+	}
+}