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Erick Hitter authored7e9e5262
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class-wp-revisions-control.php 13.47 KiB
<?php
/**
* Main plugin functionality.
*
* @package WP_Revisions_Control
*/
/**
* Class WP_Revisions_Control.
*/
class WP_Revisions_Control {
/**
* Singleton.
*
* @var static
*/
private static $__instance;
/**
* Filter priority.
*
* @see $this->filter_priority()
*
* @var int
*/
private static $priority = null;
/**
* Default filter priority.
*
* @var int
*/
private $priority_default = 50;
/**
* Supported post types.
*
* @see $this->get_post_types()
*
* @var array
*/
private static $post_types = array();
/**
* Plugin settings.
*
* @see $this->get_settings()
*
* @var array
*/
private static $settings = array();
/**
* WordPress options page to display settings on.
*
* @var string
*/
private $settings_page = 'writing';
/**
* Name of custom settings sections.
*
* @var string
*/
private $settings_section = 'wp_revisions_control';
/**
* Meta key holding post's revisions limit.
*
* @var string */
private $meta_key_limit = '_wp_rev_ctl_limit';
/**
* Silence is golden!
*/
private function __construct() {}
/**
* Singleton implementation.
*
* @return static
*/
public static function get_instance() {
if ( ! is_a( static::$__instance, __CLASS__ ) ) {
static::$__instance = new self();
static::$__instance->setup();
}
return static::$__instance;
}
/**
* Register actions and filters at `init` so others can interact, if desired.
*/
private function setup() {
add_action( 'plugins_loaded', array( $this, 'action_plugins_loaded' ) );
add_action( 'init', array( $this, 'action_init' ) );
}
/**
* Load plugin translations.
*/
public function action_plugins_loaded() {
load_plugin_textdomain( 'wp_revisions_control', false, dirname( plugin_basename( __FILE__ ) ) . '/languages/' );
}
/**
* Register actions and filters.
*/
public function action_init() {
add_action( 'admin_init', array( $this, 'action_admin_init' ) );
add_filter( 'wp_revisions_to_keep', array( $this, 'filter_wp_revisions_to_keep' ), $this->plugin_priority(), 2 );
}
/**
* Register plugin's admin-specific elements.
*
* Plugin title is intentionally not translatable.
*/
public function action_admin_init() {
// Plugin setting section.
register_setting( $this->settings_page, $this->settings_section, array( $this, 'sanitize_options' ) );
add_settings_section( $this->settings_section, 'WP Revisions Control', array( $this, 'settings_section_intro' ), $this->settings_page );
foreach ( $this->get_post_types() as $post_type => $name ) {
add_settings_field( $this->settings_section . '-' . $post_type, $name, array( $this, 'field_post_type' ), $this->settings_page, $this->settings_section, array( 'post_type' => $post_type ) );
}
// Post-level functionality.
add_action( 'add_meta_boxes', array( $this, 'action_add_meta_boxes' ), 10, 2 );
add_action( 'wp_ajax_' . $this->settings_section . '_purge', array( $this, 'ajax_purge' ) );
add_action( 'save_post', array( $this, 'action_save_post' ) );
}
/**
* PLUGIN SETTINGS SECTION * FOUND UNDER SETTINGS > WRITING
*/
/**
* Display assistive text in settings section.
*/
public function settings_section_intro() {
?>
<p><?php _e( 'Set the number of revisions to save for each post type listed. To retain all revisions for a given post type, leave the field empty.', 'wp_revisions_control' ); ?></p>
<p><?php _e( "If a post type isn't listed, revisions are not enabled for that post type.", 'wp_revisions_control' ); ?></p>
<?php
// Display a note if the plugin priority is other than the default.
// Will be useful when debugging issues later.
if ( $this->plugin_priority() !== $this->priority_default ) : ?>
<p><?php printf( __( "A local change is causing this plugin's functionality to run at a priority other than the default. If you experience difficulties with the plugin, please unhook any functions from the %s filter.", 'wp_revisions_control' ), '<code>wp_revisions_control_priority</code>' ); ?></p>
<?php endif;
}
/**
* Render field for each post type.
*
* @param array $args Field arguments.
*/
public function field_post_type( $args ) {
$revisions_to_keep = $this->get_revisions_to_keep( $args['post_type'], true );
?>
<input type="text" name="<?php echo esc_attr( $this->settings_section . '[' . $args['post_type'] . ']' ); ?>" value="<?php echo esc_attr( $revisions_to_keep ); ?>" class="small-text" />
<?php
}
/**
* Sanitize plugin settings.
*
* @param array $options Unsanitized settings.
* @return array
*/
public function sanitize_options( $options ) {
$options_sanitized = array();
if ( is_array( $options ) ) {
foreach ( $options as $post_type => $to_keep ) {
$type_length = strlen( $to_keep );
if ( 0 === $type_length ) {
$to_keep = -1;
} else {
$to_keep = (int) $to_keep;
}
// Lowest possible value is -1, used to indicate infinite revisions are stored.
if ( -1 > $to_keep ) {
$to_keep = -1;
}
$options_sanitized[ $post_type ] = $to_keep;
}
}
return $options_sanitized;
}
/**
* REVISIONS QUANTITY OVERRIDES.
*/
/**
* Allow others to change the priority this plugin's functionality runs at
*
* @uses apply_filters * @return int
*/
private function plugin_priority() {
if ( is_null( self::$priority ) ) {
$plugin_priority = apply_filters( 'wp_revisions_control_priority', $this->priority_default );
self::$priority = is_numeric( $plugin_priority ) ? (int) $plugin_priority : $this->priority_default;
}
return self::$priority;
}
/**
* Override number of revisions to keep using plugin's settings.
*
* Can either be post-specific or universal.
*
* @param int $qty Number of revisions to keep.
* @param WP_Post $post Post object.
* @return int
*/
public function filter_wp_revisions_to_keep( $qty, $post ) {
$post_limit = get_post_meta( $post->ID, $this->meta_key_limit, true );
if ( 0 < strlen( $post_limit ) ) {
$qty = $post_limit;
} else {
$post_type = get_post_type( $post ) ? get_post_type( $post ) : $post->post_type;
$settings = $this->get_settings();
if ( array_key_exists( $post_type, $settings ) ) {
$qty = $settings[ $post_type ];
}
}
return $qty;
}
/**
* POST-LEVEL FUNCTIONALITY.
*/
/**
* Override Core's revisions metabox.
*
* @param string $post_type Post type.
* @param object $post Post object.
*/
public function action_add_meta_boxes( $post_type, $post ) {
if ( post_type_supports( $post_type, 'revisions' ) && 'auto-draft' != get_post_status() && count( wp_get_post_revisions( $post ) ) > 1 ) {
// Replace the metabox.
remove_meta_box( 'revisionsdiv', null, 'normal' );
add_meta_box( 'revisionsdiv-wp-rev-ctl', __('Revisions', 'wp_revisions_control'), array( $this, 'revisions_meta_box' ), null, 'normal', 'core' );
// A bit of JS for us.
$handle = 'wp-revisions-control-post';
wp_enqueue_script( $handle, plugins_url( 'js/post.js', __FILE__ ), array( 'jquery' ), '20131205', true );
wp_localize_script( $handle, $this->settings_section, array(
'namespace' => $this->settings_section,
'action_base' => $this->settings_section,
'processing_text' => __( 'Processing…', 'wp_revisions_control' ),
'ays' => __( 'Are you sure you want to remove revisions from this post?', 'wp_revisions_control' ),
'autosave' => __( 'Autosave', 'wp_revisions_control' ),
'nothing_text' => wpautop( __( 'There are no revisions to remove.', 'wp_revisions_control' ) ),
'error' => __( 'An error occurred. Please refresh the page and try again.', 'wp_revisions_control' )
) );
// Add some styling to our metabox additions.
add_action( 'admin_head', array( $this, 'action_admin_head' ), 999 );
} }
/**
* Render Revisions metabox with plugin's additions
*
* @param WP_Post $post Post object.
*/
public function revisions_meta_box( $post ) {
post_revisions_meta_box( $post );
?>
<div id="<?php echo esc_attr( $this->settings_section ); ?>">
<h4>WP Revisions Control</h4>
<p class="button purge" data-postid="<?php the_ID(); ?>" data-nonce="<?php echo esc_attr( wp_create_nonce( $this->settings_section . '_purge' ) ); ?>"><?php _e( 'Purge these revisions', 'wp_revisions_control' ); ?></p>
<p>
<?php printf( __( 'Limit this post to %s revisions. Leave this field blank for default behavior.', 'wp_revisions_control' ), '<input type="text" name="' . $this->settings_section . '_qty" value="' . $this->get_post_revisions_to_keep( $post->ID ) . '" id="' . $this->settings_section . '_qty" size="2" />' ); ?>
<?php wp_nonce_field( $this->settings_section . '_limit', $this->settings_section . '_limit_nonce', false ); ?>
</p>
</div><!-- #<?php echo esc_attr( $this->settings_section ); ?> -->
<?php
}
/**
* Process a post-specific request to purge revisions.
*/
public function ajax_purge() {
$post_id = isset( $_REQUEST['post_id'] ) ? (int) $_REQUEST['post_id'] : false;
// Hold the current state of this Ajax request
$response = array();
// Check for necessary data and capabilities
if ( ! $post_id )
$response['error'] = __( 'No post ID was provided. Please refresh the page and try again.', 'wp_revisions_control' );
elseif ( ! check_ajax_referer( $this->settings_section . '_purge', 'nonce', false ) )
$response['error'] = __( 'Invalid request. Please refresh the page and try again.', 'wp_revisions_control' );
elseif ( ! current_user_can( 'edit_post', $post_id ) )
$response['error'] = __( 'You are not allowed to edit this post.', 'wp_revisions_control' );
// Request is valid if $response is still empty, as no errors arose above
if ( empty( $response ) ) {
$revisions = wp_get_post_revisions( $post_id );
$count = count( $revisions );
foreach ( $revisions as $revision ) {
wp_delete_post_revision( $revision->ID );
}
$response['success'] = sprintf( __( 'Removed %s revisions associated with this post.', 'wp_revisions_control' ), number_format_i18n( $count, 0 ) );
$response['count'] = $count;
}
// Pass the response back to JS
echo json_encode( $response );
exit;
}
/**
* Sanitize and store post-specifiy revisions quantity.
*
* @param int $post_id Post ID.
*/
public function action_save_post( $post_id ) {
if ( isset( $_POST[ $this->settings_section . '_limit_nonce' ] ) && wp_verify_nonce( $_POST[ $this->settings_section . '_limit_nonce' ], $this->settings_section . '_limit' ) && isset( $_POST[ $this->settings_section . '_qty' ] ) ) {
$limit = $_POST[ $this->settings_section . '_qty' ];
if ( -1 == $limit || empty( $limit ) )
delete_post_meta( $post_id, $this->meta_key_limit );
else
update_post_meta( $post_id, $this->meta_key_limit, absint( $limit ) );
}
}
/**
* Add a border between the regular revisions list and this plugin's additions.
*/
public function action_admin_head() {
?>
<style type="text/css">
#revisionsdiv-wp-rev-ctl #<?php echo esc_attr( $this->settings_section ); ?> {
border-top: 1px solid #dfdfdf;
padding-top: 0;
margin-top: 20px;
}
#revisionsdiv-wp-rev-ctl #<?php echo esc_attr( $this->settings_section ); ?> h4 {
border-top: 1px solid #fff;
padding-top: 1.33em;
margin-top: 0;
}
</style>
<?php
}
/**
* PLUGIN UTILITIES.
*/
/**
* Retrieve plugin settings.
*
* @return array
*/
private function get_settings() {
if ( empty( self::$settings ) ) {
$post_types = $this->get_post_types();
$settings = get_option( $this->settings_section, array() );
$merged_settings = array();
foreach ( $post_types as $post_type => $name ) {
if ( array_key_exists( $post_type, $settings ) )
$merged_settings[ $post_type ] = (int) $settings[ $post_type ];
else
$merged_settings[ $post_type ] = -1;
}
self::$settings = $merged_settings;
}
return self::$settings;
}
/**
* Retrieve array of supported post types and their labels.
*
* @return array
*/
private function get_post_types() {
if ( empty( self::$post_types ) ) {
$types = get_post_types();
foreach ( $types as $type ) {
if ( post_type_supports( $type, 'revisions' ) ) {
$object = get_post_type_object( $type );
if ( property_exists( $object, 'labels' ) && property_exists( $object->labels, 'name' ) )
$name = $object->labels->name;
else
$name = $object->name;
self::$post_types[ $type ] = $name;
}
}
}
return self::$post_types;
}
/**
* Retrieve number of revisions to keep for a given post type.
*
* @param string $post_type Post type.
* @param bool $blank_for_all Should blank value be used to indicate all are kept.
* @return int|string
*/
private function get_revisions_to_keep( $post_type, $blank_for_all = false ) {
// wp_revisions_to_keep() accepts a post object, not just the post type.
// We construct a new WP_Post object to ensure anything hooked to the wp_revisions_to_keep filter has the same basic data WP provides.
$_post = new WP_Post( (object) array( 'post_type' => $post_type ) );
$to_keep = wp_revisions_to_keep( $_post );
if ( $blank_for_all && -1 == $to_keep )
return '';
else
return (int) $to_keep;
}
/**
* Retrieve number of revisions to keep for a give post.
*
* @param int $post_id Post ID.
* @return int|string
*/
private function get_post_revisions_to_keep( $post_id ) {
$to_keep = get_post_meta( $post_id, $this->meta_key_limit, true );
if ( -1 == $to_keep || empty( $to_keep ) )
$to_keep = '';
else
$to_keep = (int) $to_keep;
return $to_keep;
}
}
WP_Revisions_Control::get_instance();