--- /dev/null
+<?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.
+ *
+ * @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 $return;
+}
+
+/**
+ * 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
+ *
+ * @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;
+ }
+ }
+ //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.
+ *
+ * @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, array( 'check_enabled' => false ) );
+
+ 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.
+ *
+ * @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.
+ *
+ * @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.
+ *
+ * @since 2.6.0
+ * @access private
+ *
+ * @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 );
+
+ return $revision_id;
+}
+
+/**
+ * Gets a post revision.
+ *
+ * @since 2.6.0
+ *
+ * @uses get_post()
+ *
+ * @param int|object $post The post ID or 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.
+ *
+ * @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
+
+ $post_id = wp_update_post( $update );
+ if ( ! $post_id || is_wp_error( $post_id ) )
+ return $post_id;
+
+ // Add restore from details
+ $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 );
+
+ // Update last edit user
+ update_post_meta( $post_id, '_edit_last', get_current_user_id() );
+
+ do_action( 'wp_restore_post_revision', $post_id, $revision['ID'] );
+
+ return $post_id;
+}
+
+/**
+ * Deletes a revision.
+ *
+ * Deletes the row from the posts table corresponding to the specified revision.
+ *
+ * @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.
+ *
+ * @since 2.6.0
+ *
+ * @uses get_children()
+ *
+ * @param int|object $post_id Post ID or post object
+ * @return array An array of revisions, or an empty array if none.
+ */
+function wp_get_post_revisions( $post_id = 0, $args = null ) {
+ $post = get_post( $post_id );
+ if ( ! $post || empty( $post->ID ) )
+ return array();
+
+ $defaults = array( 'order' => 'DESC', 'orderby' => 'date', 'check_enabled' => true );
+ $args = wp_parse_args( $args, $defaults );
+
+ if ( $args['check_enabled'] && ! wp_revisions_enabled( $post ) )
+ return array();
+
+ $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 The post object.
+ * @return bool True if number of revisions to keep isn't zero, false otherwise.
+ */
+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 The post object.
+ * @return int The number of revisions to keep.
+ */
+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, $post );
+}
+
+/**
+ * Sets up the post object for preview based on the post autosave.
+ *
+ * @since 2.7.0
+ * @access private
+ */
+function _set_preview($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_the_terms', '_wp_preview_terms_filter', 10, 3 );
+
+ return $post;
+}
+
+/**
+ * Filters the latest content for preview from the post autosave.
+ *
+ * @since 2.7.0
+ * @access private
+ */
+function _show_post_preview() {
+
+ if ( isset($_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 terms lookup to set the post format.
+ *
+ * @since 3.6.0
+ * @access private
+ */
+function _wp_preview_terms_filter( $terms, $post_id, $taxonomy ) {
+ if ( ! $post = get_post() )
+ return $terms;
+
+ if ( empty( $_REQUEST['post_format'] ) || $post->ID != $post_id || 'post_format' != $taxonomy || 'revision' == $post->post_type )
+ return $terms;
+
+ if ( 'standard' == $_REQUEST['post_format'] )
+ $terms = array();
+ elseif ( $term = get_term_by( 'slug', 'post-format-' . sanitize_key( $_REQUEST['post_format'] ), 'post_format' ) )
+ $terms = array( $term ); // Can only have one post format
+
+ return $terms;
+}
+
+/**
+ * Gets the post revision version.
+ *
+ * @since 3.6.0
+ * @access private
+*/
+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 revisions author, add the current post as a revision and set the revisions version to 1
+ *
+ * @since 3.6.0
+ * @access private
+ *
+ * @uses wp_get_post_revisions()
+ *
+ * @param object $post Post object
+ * @param array $revisions Current revisions of the post
+ * @return bool true if the revisions were upgraded, false if problems
+ */
+function _wp_upgrade_revisions_of_post( $post, $revisions ) {
+ global $wpdb;
+
+ // 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 );
+ $add_last = true;
+
+ 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.
+ // No need to add a copy of the post as latest revision.
+ if ( 0 < $this_revision_version ) {
+ $add_last = false;
+ 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.
+ if ( $add_last )
+ wp_save_post_revision( $post->ID );
+
+ return true;
+}
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