class-accessibility-statement-plugin.php

<?php
/**
 * Main Plugin file for the Accessibility Statement Generator
 */

require_once 'class-statement-generator.php';

/**
 * Main Plugin File
 */
class AccessibilityStatementPlugin {
	/**
	 * Plugin admin sections
	 *
	 * @var array
	 */
	private $sections = array();

	/**
	 * Contructor
	 *
	 * Add admin pages and actions
	 *
	 * @return  void
	 */
	public function __construct() {
		add_action( 'admin_menu', array( $this, 'add_settings_page' ) );
		add_action( 'display_post_states', array( $this, 'add_post_state' ), 10, 2 );
		add_action( 'admin_notices', array( $this, 'add_admin_notices' ) );

		add_action( 'admin_post_set_accessibility_statement', array( $this, 'set_accessibility_statement' ) );
		add_action( 'admin_post_create_accessibility_statement', array( $this, 'create_accessibility_statement' ) );
	}

	/**
	 * Create the accessibility statement page
	 *
	 * @return  void
	 */
	public function create_accessibility_statement() {
		if ( ! $this->check_nonce( 'create_accessibility_statement' ) ) {
			wp_redirect( admin_url( 'options-general.php?page=accessibility-statement&failed-nonce=1' ) );
			exit;
		}

		$default_accessibility_statement_content = StatementGenerator::get_default_content();

		$accessibility_statement_id = wp_insert_post(
			array(
				'post_title'   => __( 'Accessibility Statement' ),
				'post_status'  => 'draft',
				'post_type'    => 'page',
				'post_content' => $default_accessibility_statement_content,
			),
			true
		);

		if ( is_wp_error( $accessibility_statement_id ) ) {
			wp_redirect( admin_url( 'options-general.php?page=accessibility-statement&page-created-error=1' ) );
			exit;
		} else {
			update_option( 'wp_page_for_accessibility_statement', $accessibility_statement_id );

			wp_redirect( admin_url( 'post.php?post=' . $accessibility_statement_id . '&action=edit' ) );
			exit;
		}
	}

	/**
	 * Check a nonce
	 *
	 * @param   string $nonce_field  Nonce name.
	 *
	 * @return  boolean                True if we can verify the nonce, else false
	 */
	private function check_nonce( $nonce_field ) {
		if ( ! isset( $_POST[ $nonce_field ] ) || ! wp_verify_nonce( $_POST[ $nonce_field ], $nonce_field ) ) {
			return false;
		}

		return true;
	}

	/**
	 * Set the accessibility statement page
	 *
	 * @return  void
	 */
	public function set_accessibility_statement() {
		if ( ! $this->check_nonce( 'set_accessibility_statement' ) ) {
			wp_redirect( admin_url( 'options-general.php?page=accessibility-statement&failed-nonce=1' ) );
			exit;
		}

		$accessibility_page_id = isset( $_POST['page_for_accessibility_statement'] ) ? (int) $_POST['page_for_accessibility_statement'] : 0;

		update_option( 'wp_page_for_accessibility_statement', $accessibility_page_id );

		wp_redirect( admin_url( 'options-general.php?page=accessibility-statement&page-updated=1' ) );
		exit;
	}

	/**
	 * Display notices on settings page
	 *
	 * @return void
	 */
	public function add_admin_notices() {
		$screen = get_current_screen();

		if ( 'settings_page_accessibility-statement' === $screen->id ) {
			$this->display_nonce_notices();
			$this->display_update_statement_notices();
			$this->display_create_statement_notices();
			$this->display_selected_statement_notices();
		}
	}

	/**
	 * Display notices relating to nonce checks
	 *
	 * @return  void
	 */
	private function display_nonce_notices() {
		if ( isset( $_GET['failed-nonce'] ) && $_GET['failed-nonce'] ) {
			add_settings_error(
				'page_for_accessibility_statement',
				'page_for_accessibility_statement',
				__( 'Nonce couldn\'t be verified.' ),
				'error'
			);
		}
	}

	/**
	 * Display the notices related to the chosen Accessibility Statement page
	 *
	 * @return  void
	 */
	private function display_selected_statement_notices() {
		$accessibility_statement_id = (int) get_option( 'wp_page_for_accessibility_statement' );

		if ( ! empty( $accessibility_statement_id ) ) {
			$accessibility_statement = get_post( $accessibility_statement_id );
			if ( ! $accessibility_statement instanceof WP_Post ) {
				add_settings_error(
					'page_for_accessibility_statement',
					'page_for_accessibility_statement',
					__( 'The currently selected Accessibility Statement page does not exist. Please create or select a new page.' ),
					'error'
				);
			} else {
				if ( 'trash' === $accessibility_statement->post_status ) {
					add_settings_error(
						'page_for_accessibility_statement',
						'page_for_accessibility_statement',
						sprintf(
							/* translators: %s: URL to Pages Trash. */
							__( 'The currently selected Accessibility Statement page is in the Trash. Please create or select a new Accessibility Statement page or <a href="%s">restore the current page</a>.' ),
							'edit.php?post_status=trash&post_type=page'
						),
						'error'
					);
				}
			}
		}
	}

	/**
	 * Display the notices related to creating an Accessibility Statement
	 *
	 * @return  void
	 */
	private function display_create_statement_notices() {
		if ( isset( $_GET['page-created-error'] ) && $_GET['page-created-error'] ) {
			add_settings_error(
				'page_for_accessibility_statement',
				'page_for_accessibility_statement',
				__( 'Unable to create an Accessibility Statement.' ),
				'error'
			);
		}
	}

	/**
	 * Display the notices related to updating the Accessiblity Statement page
	 *
	 * @return  void
	 */
	private function display_update_statement_notices() {
		if ( isset( $_GET['page-updated'] ) && $_GET['page-updated'] ) {
			$accessibility_statement_updated_message = __( 'Accessibility Statement page updated successfully.' );

			$accessibility_page_id = get_option( 'wp_page_for_accessibility_statement' );

			if ( $accessibility_page_id ) {
				if (
					'publish' === get_post_status( $accessibility_page_id )
					&& current_user_can( 'edit_theme_options' )
					&& current_theme_supports( 'menus' )
				) {
					$accessibility_statement_updated_message = sprintf(
						/* translators: %s: URL to Customizer -> Menus. */
						__( 'Accessibility Statement page setting updated successfully. Remember to <a href="%s">update your menus</a>!' ),
						esc_url( add_query_arg( 'autofocus[panel]', 'nav_menus', admin_url( 'customize.php' ) ) )
					);
				}
			}

			add_settings_error( 'page_for_accessibility_statement', 'page_for_accessibility_statement', $accessibility_statement_updated_message, 'success' );
		}
	}

	/**
	 * Add the post state for the Accessibility Statement
	 *
	 * @param array   $post_states  Array of post states.
	 * @param WP_Post $post         Current Post.
	 *
	 * @return  array                Array of post states
	 */
	public function add_post_state( $post_states, $post ) {
		if ( intval( get_option( 'wp_page_for_accessibility_statement' ) ) === $post->ID ) {
			$post_states['page_for_accessibility_statement'] = _x( 'Accessibility Statement Page', 'page label' );
		}

		return $post_states;
	}

	/**
	 * Add Settings page to Admin dashboard
	 *
	 * @return  void
	 */
	public function add_settings_page() {
		add_options_page( __( 'Accessibility Statement', 'a11y-statement' ), __( 'Accessibility', 'a11y-statement' ), 'manage_options', 'accessibility-statement', array( $this, 'page_contents' ), 7 );
	}

	/**
	 * Get the Settings page contents
	 *
	 * @return  void
	 */
	public function page_contents() {
		include 'settings-page.php';
	}
}