WordPress/wp-includes/revision.php

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<?php
/**
* Post revision functions.
*
* @package WordPress
* @subpackage Post_Revisions
*/
/**
* Determines which fields of posts are to be saved in revisions.
*
* Does two things. If passed a post *array*, it will return a post array ready
* to be inserted into the posts table as a post revision. Otherwise, returns
* an array whose keys are the post fields to be saved for post revisions.
*
* @package WordPress
* @subpackage Post_Revisions
* @since 2.6.0
* @access private
* @uses apply_filters() Calls '_wp_post_revision_fields' on 'title', 'content' and 'excerpt' fields.
*
* @param array $post Optional a post array to be processed for insertion as a post revision.
* @param bool $autosave optional Is the revision an autosave?
* @return array Post array ready to be inserted as a post revision or array of fields that can be versioned.
*/
function _wp_post_revision_fields( $post = null, $autosave = false ) {
static $fields = false;
if ( !$fields ) {
// Allow these to be versioned
$fields = array(
'post_title' => __( 'Title' ),
'post_content' => __( 'Content' ),
'post_excerpt' => __( 'Excerpt' ),
);
// Runs only once
$fields = apply_filters( '_wp_post_revision_fields', $fields );
// WP uses these internally either in versioning or elsewhere - they cannot be versioned
foreach ( array( 'ID', 'post_name', 'post_parent', 'post_date', 'post_date_gmt', 'post_status', 'post_type', 'comment_count', 'post_author' ) as $protect )
unset( $fields[$protect] );
}
if ( !is_array($post) )
return $fields;
$return = array();
foreach ( array_intersect( array_keys( $post ), array_keys( $fields ) ) as $field )
$return[$field] = $post[$field];
$return['post_parent'] = $post['ID'];
$return['post_status'] = 'inherit';
$return['post_type'] = 'revision';
$return['post_name'] = $autosave ? "$post[ID]-autosave-v1" : "$post[ID]-revision-v1"; // "1" is the revisioning system version
$return['post_date'] = isset($post['post_modified']) ? $post['post_modified'] : '';
$return['post_date_gmt'] = isset($post['post_modified_gmt']) ? $post['post_modified_gmt'] : '';
$return['post_author'] = get_post_meta( $post['ID'], '_edit_last', true );
return $return;
}
/**
* Determines which post meta fields are revisioned.
*
* @since 3.6
* @access private
* @return array An array of meta keys that should be revisioned.
*/
function _wp_post_revision_meta_keys() {
return array(
'_wp_format_url',
'_wp_format_quote',
'_wp_format_quote_source',
'_wp_format_image',
'_wp_format_gallery',
'_wp_format_audio',
'_wp_format_video',
);
}
/**
* Saves an already existing post as a post revision.
*
* Typically used immediately after post updates.
* Adds a copy of the current post as a revision, so latest revision always matches current post
*
* @package WordPress
* @subpackage Post_Revisions
* @since 2.6.0
*
* @uses _wp_put_post_revision()
*
* @param int $post_id The ID of the post to save as a revision.
* @return mixed Null or 0 if error, new revision ID, if success.
*/
function wp_save_post_revision( $post_id ) {
if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE )
return;
if ( ! $post = get_post( $post_id ) )
return;
if ( ! post_type_supports( $post->post_type, 'revisions' ) )
return;
if ( 'auto-draft' == $post->post_status )
return;
if ( ! wp_revisions_enabled( $post ) )
return;
// Compare the proposed update with the last stored revision verifying that
// they are different, unless a plugin tells us to always save regardless.
// If no previous revisions, save one
if ( $revisions = wp_get_post_revisions( $post_id ) ) {
// grab the last revision, but not an autosave
foreach ( $revisions as $revision ) {
if ( false !== strpos( $revision->post_name, "{$revision->post_parent}-revision" ) ) {
$last_revision = $revision;
break;
}
}
if ( isset( $last_revision ) && apply_filters( 'wp_save_post_revision_check_for_changes', true, $last_revision, $post ) ) {
$post_has_changed = false;
foreach ( array_keys( _wp_post_revision_fields() ) as $field ) {
if ( normalize_whitespace( $post->$field ) != normalize_whitespace( $last_revision->$field ) ) {
$post_has_changed = true;
break;
}
}
// Check whether revisioned meta fields have changed.
foreach ( _wp_post_revision_meta_keys() as $meta_key ) {
if ( get_post_meta( $post->ID, $meta_key ) != get_post_meta( $last_revision->ID, $meta_key ) ) {
$post_has_changed = true;
break;
}
}
//don't save revision if post unchanged
if( ! $post_has_changed )
return;
}
}
$return = _wp_put_post_revision( $post );
$revisions_to_keep = wp_revisions_to_keep( $post );
if ( $revisions_to_keep < 0 )
return $return;
// all revisions and autosaves
$revisions = wp_get_post_revisions( $post_id, array( 'order' => 'ASC' ) );
$delete = count($revisions) - $revisions_to_keep;
if ( $delete < 1 )
return $return;
$revisions = array_slice( $revisions, 0, $delete );
for ( $i = 0; isset( $revisions[$i] ); $i++ ) {
if ( false !== strpos( $revisions[ $i ]->post_name, 'autosave' ) )
continue;
wp_delete_post_revision( $revisions[ $i ]->ID );
}
return $return;
}
/**
* Retrieve the autosaved data of the specified post.
*
* Returns a post object containing the information that was autosaved for the
* specified post. If the optional $user_id is passed, returns the autosave for that user
* otherwise returns the latest autosave.
*
* @package WordPress
* @subpackage Post_Revisions
* @since 2.6.0
* @uses wp_get_post_revisions()
*
* @param int $post_id The post ID.
* @param int $user_id optional The post author ID.
* @return object|bool The autosaved data or false on failure or when no autosave exists.
*/
function wp_get_post_autosave( $post_id, $user_id = 0 ) {
$revisions = wp_get_post_revisions($post_id);
foreach ( $revisions as $revision ) {
if ( false !== strpos( $revision->post_name, "{$post_id}-autosave" ) ) {
if ( $user_id && $user_id != $revision->post_author )
continue;
return $revision;
break;
}
}
return false;
}
/**
* Determines if the specified post is a revision.
*
* @package WordPress
* @subpackage Post_Revisions
* @since 2.6.0
*
* @param int|object $post Post ID or post object.
* @return bool|int False if not a revision, ID of revision's parent otherwise.
*/
function wp_is_post_revision( $post ) {
if ( !$post = wp_get_post_revision( $post ) )
return false;
return (int) $post->post_parent;
}
/**
* Determines if the specified post is an autosave.
*
* @package WordPress
* @subpackage Post_Revisions
* @since 2.6.0
*
* @param int|object $post Post ID or post object.
* @return bool|int False if not a revision, ID of autosave's parent otherwise
*/
function wp_is_post_autosave( $post ) {
if ( !$post = wp_get_post_revision( $post ) )
return false;
if ( false !== strpos( $post->post_name, "{$post->post_parent}-autosave" ) )
return (int) $post->post_parent;
return false;
}
/**
* Inserts post data into the posts table as a post revision.
*
* @package WordPress
* @subpackage Post_Revisions
* @since 2.6.0
*
* @uses wp_insert_post()
*
* @param int|object|array $post Post ID, post object OR post array.
* @param bool $autosave Optional. Is the revision an autosave?
* @return mixed Null or 0 if error, new revision ID if success.
*/
function _wp_put_post_revision( $post = null, $autosave = false ) {
if ( is_object($post) )
$post = get_object_vars( $post );
elseif ( !is_array($post) )
$post = get_post($post, ARRAY_A);
if ( !$post || empty($post['ID']) )
return;
if ( isset($post['post_type']) && 'revision' == $post['post_type'] )
return new WP_Error( 'post_type', __( 'Cannot create a revision of a revision' ) );
$post_id = $post['ID'];
$post = _wp_post_revision_fields( $post, $autosave );
$post = wp_slash($post); //since data is from db
$revision_id = wp_insert_post( $post );
if ( is_wp_error($revision_id) )
return $revision_id;
if ( $revision_id )
do_action( '_wp_put_post_revision', $revision_id );
// Save revisioned meta fields.
foreach ( _wp_post_revision_meta_keys() as $meta_key ) {
$meta_values = get_post_meta( $post_id, $meta_key );
if ( false === $meta_values )
continue;
// Use the underlying add_metadata vs add_post_meta to make sure
// metadata is added to the revision post and not its parent.
foreach ( $meta_values as $meta_value )
add_metadata( 'post', $revision_id, $meta_key, $meta_value );
}
return $revision_id;
}
/**
* Gets a post revision.
*
* @package WordPress
* @subpackage Post_Revisions
* @since 2.6.0
*
* @uses get_post()
*
* @param int|object $post Post ID or post object
* @param string $output Optional. OBJECT, ARRAY_A, or ARRAY_N.
* @param string $filter Optional sanitation filter. @see sanitize_post()
* @return mixed Null if error or post object if success
*/
function wp_get_post_revision(&$post, $output = OBJECT, $filter = 'raw') {
$null = null;
if ( !$revision = get_post( $post, OBJECT, $filter ) )
return $revision;
if ( 'revision' !== $revision->post_type )
return $null;
if ( $output == OBJECT ) {
return $revision;
} elseif ( $output == ARRAY_A ) {
$_revision = get_object_vars($revision);
return $_revision;
} elseif ( $output == ARRAY_N ) {
$_revision = array_values(get_object_vars($revision));
return $_revision;
}
return $revision;
}
/**
* Restores a post to the specified revision.
*
* Can restore a past revision using all fields of the post revision, or only selected fields.
*
* @package WordPress
* @subpackage Post_Revisions
* @since 2.6.0
*
* @uses wp_get_post_revision()
* @uses wp_update_post()
* @uses do_action() Calls 'wp_restore_post_revision' on post ID and revision ID if wp_update_post()
* is successful.
*
* @param int|object $revision_id Revision ID or revision object.
* @param array $fields Optional. What fields to restore from. Defaults to all.
* @return mixed Null if error, false if no fields to restore, (int) post ID if success.
*/
function wp_restore_post_revision( $revision_id, $fields = null ) {
if ( !$revision = wp_get_post_revision( $revision_id, ARRAY_A ) )
return $revision;
if ( !is_array( $fields ) )
$fields = array_keys( _wp_post_revision_fields() );
$update = array();
foreach( array_intersect( array_keys( $revision ), $fields ) as $field ) {
$update[$field] = $revision[$field];
}
if ( !$update )
return false;
$update['ID'] = $revision['post_parent'];
$update = wp_slash( $update ); //since data is from db
// Restore revisioned meta fields.
foreach ( _wp_post_revision_meta_keys() as $meta_key ) {
delete_post_meta( $update['ID'], $meta_key );
$meta_values = get_post_meta( $revision['ID'], $meta_key );
if ( false === $meta_values )
continue;
foreach ( $meta_values as $meta_value )
add_post_meta( $update['ID'], $meta_key, $meta_value );
}
$post_id = wp_update_post( $update );
if ( is_wp_error( $post_id ) )
return $post_id;
if ( $post_id )
do_action( 'wp_restore_post_revision', $post_id, $revision['ID'] );
$restore_details = array(
'restored_revision_id' => $revision_id,
'restored_by_user' => get_current_user_id(),
'restored_time' => time()
);
update_post_meta( $post_id, '_post_restored_from', $restore_details );
return $post_id;
}
/**
* Deletes a revision.
*
* Deletes the row from the posts table corresponding to the specified revision.
*
* @package WordPress
* @subpackage Post_Revisions
* @since 2.6.0
*
* @uses wp_get_post_revision()
* @uses wp_delete_post()
*
* @param int|object $revision_id Revision ID or revision object.
* @return mixed Null or WP_Error if error, deleted post if success.
*/
function wp_delete_post_revision( $revision_id ) {
if ( !$revision = wp_get_post_revision( $revision_id ) )
return $revision;
$delete = wp_delete_post( $revision->ID );
if ( is_wp_error( $delete ) )
return $delete;
if ( $delete )
do_action( 'wp_delete_post_revision', $revision->ID, $revision );
return $delete;
}
/**
* Returns all revisions of specified post.
*
* @package WordPress
* @subpackage Post_Revisions
* @since 2.6.0
*
* @uses get_children()
*
* @param int|object $post_id Post ID or post object
* @return array empty if no revisions
*/
function wp_get_post_revisions( $post_id = 0, $args = null ) {
$post = get_post( $post_id );
if ( ! $post || empty( $post->ID ) || ! wp_revisions_enabled( $post ) )
return array();
$defaults = array( 'order' => 'DESC', 'orderby' => 'date' );
$args = wp_parse_args( $args, $defaults );
$args = array_merge( $args, array( 'post_parent' => $post->ID, 'post_type' => 'revision', 'post_status' => 'inherit' ) );
if ( ! $revisions = get_children( $args ) )
return array();
return $revisions;
}
/**
* Determine if revisions are enabled for a given post.
*
* @since 3.6.0
*
* @uses wp_revisions_to_keep()
*
* @param object $post
* @return bool
*/
function wp_revisions_enabled( $post ) {
return wp_revisions_to_keep( $post ) != 0;
}
/**
* Determine how many revisions to retain for a given post.
* By default, an infinite number of revisions are stored if a post type supports revisions.
*
* @since 3.6.0
*
* @uses post_type_supports()
* @uses apply_filters() Calls 'wp_revisions_to_keep' hook on the number of revisions.
*
* @param object $post
* @return int
*/
function wp_revisions_to_keep( $post ) {
$num = WP_POST_REVISIONS;
if ( true === $num )
$num = -1;
else
$num = intval( $num );
if ( ! post_type_supports( $post->post_type, 'revisions' ) )
$num = 0;
return (int) apply_filters( 'wp_revisions_to_keep', $num, $post );
}
function _set_preview($post) {
if ( ! is_object($post) )
return $post;
$preview = wp_get_post_autosave($post->ID);
if ( ! is_object($preview) )
return $post;
$preview = sanitize_post($preview);
$post->post_content = $preview->post_content;
$post->post_title = $preview->post_title;
$post->post_excerpt = $preview->post_excerpt;
add_filter( 'get_post_metadata', '_wp_preview_meta_filter', 10, 4 );
return $post;
}
function _show_post_preview() {
if ( isset($_GET['preview_id']) && isset($_GET['preview_nonce']) ) {
$id = (int) $_GET['preview_id'];
if ( false == wp_verify_nonce( $_GET['preview_nonce'], 'post_preview_' . $id ) )
wp_die( __('You do not have permission to preview drafts.') );
add_filter('the_preview', '_set_preview');
}
}
/**
* Filters post meta retrieval to get values from the actual autosave post,
* and not its parent. Filters revisioned meta keys only.
*
* @since 3.6
* @access private
*/
function _wp_preview_meta_filter( $value, $object_id, $meta_key, $single ) {
$post = get_post();
if ( $post->ID != $object_id || ! in_array( $meta_key, _wp_post_revision_meta_keys() ) || 'revision' == $post->post_type )
return $value;
$preview = wp_get_post_autosave( $post->ID );
if ( ! is_object( $preview ) )
return $value;
return get_post_meta( $preview->ID, $meta_key, $single );
}
function _wp_get_post_revision_version( $revision ) {
if ( is_object( $revision ) )
$revision = get_object_vars( $revision );
elseif ( !is_array( $revision ) )
return false;
if ( preg_match( '/^\d+-(?:autosave|revision)-v(\d+)$/', $revision['post_name'], $matches ) )
return (int) $matches[1];
return 0;
}
/**
* Upgrade the data
*
* @package WordPress
* @subpackage Post_Revisions
* @since 3.6.0
*
* @uses get_post()
* @uses post_type_supports()
* @uses wp_get_post_revisions()
*
* @param int|object $post_id Post ID or post object
* @return true if success, false if problems
*/
function _wp_upgrade_revisions_of_post( $post ) {
global $wpdb;
$post = get_post( $post );
if ( ! $post )
return false;
if ( ! post_type_supports( $post->post_type, 'revisions' ) )
return false;
$revisions = wp_get_post_revisions( $post->ID ); // array( 'order' => 'DESC', 'orderby' => 'date' ); // Always work from most recent to oldest
if ( ! $first = reset( $revisions ) )
return true;
// Check if the revisions have already been updated
if ( preg_match( '/^\d+-(?:autosave|revision)-v\d+$/', $first->post_name ) )
return true;
// Add post option exclusively
$lock = "revision-upgrade-{$post->ID}";
$now = time();
$result = $wpdb->query( $wpdb->prepare( "INSERT IGNORE INTO `$wpdb->options` (`option_name`, `option_value`, `autoload`) VALUES (%s, %s, 'no') /* LOCK */", $lock, $now ) );
if ( ! $result ) {
// If we couldn't get a lock, see how old the previous lock is
$locked = get_option( $lock );
if ( ! $locked ) {
// Can't write to the lock, and can't read the lock.
// Something broken has happened
return false;
}
if ( $locked > $now - 3600 ) {
// Lock is not too old: some other process may be upgrading this post. Bail.
return false;
}
// Lock is too old - update it (below) and continue
}
// If we could get a lock, re-"add" the option to fire all the correct filters.
update_option( $lock, $now );
reset( $revisions );
do {
$this_revision = current( $revisions );
$prev_revision = next( $revisions );
$this_revision_version = _wp_get_post_revision_version( $this_revision );
// Something terrible happened
if ( false === $this_revision_version )
continue;
// 1 is the latest revision version, so we're already up to date
if ( 0 < $this_revision_version )
continue;
// Always update the revision version
$update = array(
'post_name' => preg_replace( '/^(\d+-(?:autosave|revision))[\d-]*$/', '$1-v1', $this_revision->post_name ),
);
// If this revision is the oldest revision of the post, i.e. no $prev_revision,
// the correct post_author is probably $post->post_author, but that's only a good guess.
// Update the revision version only and Leave the author as-is.
if ( $prev_revision ) {
$prev_revision_version = _wp_get_post_revision_version( $prev_revision );
// If the previous revision is already up to date, it no longer has the information we need :(
if ( $prev_revision_version < 1 )
$update['post_author'] = $prev_revision->post_author;
}
// Upgrade this revision
$result = $wpdb->update( $wpdb->posts, $update, array( 'ID' => $this_revision->ID ) );
if ( $result )
wp_cache_delete( $this_revision->ID, 'posts' );
} while ( $prev_revision );
delete_option( $lock );
// Add a copy of the post as latest revision.
wp_save_post_revision( $post->ID );
return true;
}
/**
* Displays a human readable HTML representation of the difference between two strings.
* similar to wp_text_diff, but tracks and returns could of lines added and removed
*
* @since 3.6
* @see wp_parse_args() Used to change defaults to user defined settings.
* @uses Text_Diff
* @uses WP_Text_Diff_Renderer_Table
*
* @param string $left_string "old" (left) version of string
* @param string $right_string "new" (right) version of string
* @param string|array $args Optional. Change 'title', 'title_left', and 'title_right' defaults.
* @return array contains html, linesadded & linesdeletd, empty string if strings are equivalent.
*/
function wp_text_diff_with_count( $left_string, $right_string, $args = null ) {
$defaults = array( 'title' => '', 'title_left' => '', 'title_right' => '' );
$args = wp_parse_args( $args, $defaults );
if ( ! class_exists( 'WP_Text_Diff_Renderer_Table' ) )
require( ABSPATH . WPINC . '/wp-diff.php' );
$left_string = normalize_whitespace( $left_string );
$right_string = normalize_whitespace( $right_string );
$left_lines = explode( "\n", $left_string );
$right_lines = explode( "\n", $right_string) ;
$text_diff = new Text_Diff($left_lines, $right_lines );
$lines_added = $text_diff->countAddedLines();
$lines_deleted = $text_diff->countDeletedLines();
$renderer = new WP_Text_Diff_Renderer_Table();
$diff = $renderer->render( $text_diff );
if ( !$diff )
return '';
$r = "<table class='diff'>\n";
if ( ! empty( $args[ 'show_split_view' ] ) ) {
$r .= "<col class='content diffsplit left' /><col class='content diffsplit middle' /><col class='content diffsplit right' />";
} else {
$r .= "<col class='content' />";
}
if ( $args['title'] || $args['title_left'] || $args['title_right'] )
$r .= "<thead>";
if ( $args['title'] )
$r .= "<tr class='diff-title'><th colspan='4'>$args[title]</th></tr>\n";
if ( $args['title_left'] || $args['title_right'] ) {
$r .= "<tr class='diff-sub-title'>\n";
$r .= "\t<td></td><th>$args[title_left]</th>\n";
$r .= "\t<td></td><th>$args[title_right]</th>\n";
$r .= "</tr>\n";
}
if ( $args['title'] || $args['title_left'] || $args['title_right'] )
$r .= "</thead>\n";
$r .= "<tbody>\n$diff\n</tbody>\n";
$r .= "</table>";
return array( 'html' => $r, 'lines_added' => $lines_added, 'lines_deleted' => $lines_deleted );
}