introduction-to-wordpress-plugin-development/class-tutsplus-post-notice-editor.php at master · tutsplus/introduction-to-wordpress-plugin-development · GitHub

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<?php

class TutsPlus_Post_Notice_Editor {

	public function initialize() {

		add_action( 'add_meta_boxes', array( $this, 'add_meta_box' ) );
		add_action( 'save_post', array( $this, 'save_post_notice' ) );
	}

	public function add_meta_box() {

		add_meta_box(
			'tutsplus-post-notice',
			'Post Notice',
			array( $this, 'post_notice_display' ),
			'post',
			'normal',
			'high'
		);

	}

	public function post_notice_display() {
		require_once(
			plugin_dir_path( __FILE__ ) . 'views/tutsplus-post-notice-editor.php'
		);
	}

	public function save_post_notice( $post_id ) {

		if ( ! $this->user_can_save( $post_id ) ) {
			return;
		}

		$post_notice = $_POST[ 'tutsplus-post-notice-editor' ];
		$post_notice = stripslashes( strip_tags( $post_notice ) );

		update_post_meta( $post_id, 'tutsplus-post-notice', $post_notice );

	}

	public function user_can_save( $post_id ) {

		$is_valid_nonce =
			( isset( $_POST['tutsplus-post-notice-nonce'] ) ) &&
			wp_verify_nonce(
				$_POST[ 'tutsplus-post-notice-nonce' ],
				'tutsplus-post-notice-save'
			);

		$is_autosave = wp_is_post_autosave( $post_id );
		$is_revision = wp_is_post_revision( $post_id );

		return ! ( $is_autosave || $is_revision ) && $is_valid_nonce;

	}

}