785 lines
21 KiB
PHP
785 lines
21 KiB
PHP
<?php
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/**
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* Post revision functions.
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*
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* @package WordPress
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* @subpackage Post_Revisions
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*/
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/**
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* Determines which fields of posts are to be saved in revisions.
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*
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* @since 2.6.0
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* @since 4.5.0 A `WP_Post` object can now be passed to the `$post` parameter.
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* @since 4.5.0 The optional `$autosave` parameter was deprecated and renamed to `$deprecated`.
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* @access private
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*
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* @staticvar array $fields
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*
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* @param array|WP_Post $post Optional. A post array or a WP_Post object being processed
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* for insertion as a post revision. Default empty array.
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* @param bool $deprecated Not used.
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* @return array Array of fields that can be versioned.
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*/
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function _wp_post_revision_fields( $post = array(), $deprecated = false ) {
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static $fields = null;
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if ( ! is_array( $post ) ) {
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$post = get_post( $post, ARRAY_A );
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}
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if ( is_null( $fields ) ) {
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// Allow these to be versioned
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$fields = array(
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'post_title' => __( 'Title' ),
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'post_content' => __( 'Content' ),
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'post_excerpt' => __( 'Excerpt' ),
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);
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}
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/**
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* Filters the list of fields saved in post revisions.
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*
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* Included by default: 'post_title', 'post_content' and 'post_excerpt'.
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*
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* Disallowed fields: 'ID', 'post_name', 'post_parent', 'post_date',
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* 'post_date_gmt', 'post_status', 'post_type', 'comment_count',
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* and 'post_author'.
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*
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* @since 2.6.0
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* @since 4.5.0 The `$post` parameter was added.
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*
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* @param array $fields List of fields to revision. Contains 'post_title',
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* 'post_content', and 'post_excerpt' by default.
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* @param array $post A post array being processed for insertion as a post revision.
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*/
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$fields = apply_filters( '_wp_post_revision_fields', $fields, $post );
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// WP uses these internally either in versioning or elsewhere - they cannot be versioned
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foreach ( array( 'ID', 'post_name', 'post_parent', 'post_date', 'post_date_gmt', 'post_status', 'post_type', 'comment_count', 'post_author' ) as $protect ) {
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unset( $fields[ $protect ] );
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}
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return $fields;
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}
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/**
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* Returns a post array ready to be inserted into the posts table as a post revision.
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*
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* @since 4.5.0
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* @access private
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*
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* @param array|WP_Post $post Optional. A post array or a WP_Post object to be processed
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* for insertion as a post revision. Default empty array.
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* @param bool $autosave Optional. Is the revision an autosave? Default false.
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* @return array Post array ready to be inserted as a post revision.
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*/
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function _wp_post_revision_data( $post = array(), $autosave = false ) {
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if ( ! is_array( $post ) ) {
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$post = get_post( $post, ARRAY_A );
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}
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$fields = _wp_post_revision_fields( $post );
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$revision_data = array();
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foreach ( array_intersect( array_keys( $post ), array_keys( $fields ) ) as $field ) {
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$revision_data[ $field ] = $post[ $field ];
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}
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$revision_data['post_parent'] = $post['ID'];
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$revision_data['post_status'] = 'inherit';
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$revision_data['post_type'] = 'revision';
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$revision_data['post_name'] = $autosave ? "$post[ID]-autosave-v1" : "$post[ID]-revision-v1"; // "1" is the revisioning system version
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$revision_data['post_date'] = isset( $post['post_modified'] ) ? $post['post_modified'] : '';
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$revision_data['post_date_gmt'] = isset( $post['post_modified_gmt'] ) ? $post['post_modified_gmt'] : '';
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return $revision_data;
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}
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/**
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* Creates a revision for the current version of a post.
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*
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* Typically used immediately after a post update, as every update is a revision,
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* and the most recent revision always matches the current post.
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*
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* @since 2.6.0
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*
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* @param int $post_id The ID of the post to save as a revision.
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* @return int|WP_Error|void Void or 0 if error, new revision ID, if success.
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*/
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function wp_save_post_revision( $post_id ) {
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if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) {
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return;
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}
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$post = get_post( $post_id );
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if ( ! $post ) {
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return;
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}
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if ( ! post_type_supports( $post->post_type, 'revisions' ) ) {
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return;
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}
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if ( 'auto-draft' == $post->post_status ) {
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return;
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}
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if ( ! wp_revisions_enabled( $post ) ) {
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return;
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}
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// Compare the proposed update with the last stored revision verifying that
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// they are different, unless a plugin tells us to always save regardless.
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// If no previous revisions, save one
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$revisions = wp_get_post_revisions( $post_id );
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if ( $revisions ) {
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// grab the last revision, but not an autosave
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foreach ( $revisions as $revision ) {
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if ( false !== strpos( $revision->post_name, "{$revision->post_parent}-revision" ) ) {
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$last_revision = $revision;
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break;
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}
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}
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/**
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* Filters whether the post has changed since the last revision.
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*
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* By default a revision is saved only if one of the revisioned fields has changed.
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* This filter can override that so a revision is saved even if nothing has changed.
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*
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* @since 3.6.0
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*
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* @param bool $check_for_changes Whether to check for changes before saving a new revision.
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* Default true.
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* @param WP_Post $last_revision The last revision post object.
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* @param WP_Post $post The post object.
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*/
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if ( isset( $last_revision ) && apply_filters( 'wp_save_post_revision_check_for_changes', true, $last_revision, $post ) ) {
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$post_has_changed = false;
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foreach ( array_keys( _wp_post_revision_fields( $post ) ) as $field ) {
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if ( normalize_whitespace( $post->$field ) != normalize_whitespace( $last_revision->$field ) ) {
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$post_has_changed = true;
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break;
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}
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}
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/**
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* Filters whether a post has changed.
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*
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* By default a revision is saved only if one of the revisioned fields has changed.
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* This filter allows for additional checks to determine if there were changes.
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*
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* @since 4.1.0
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*
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* @param bool $post_has_changed Whether the post has changed.
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* @param WP_Post $last_revision The last revision post object.
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* @param WP_Post $post The post object.
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*/
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$post_has_changed = (bool) apply_filters( 'wp_save_post_revision_post_has_changed', $post_has_changed, $last_revision, $post );
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//don't save revision if post unchanged
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if ( ! $post_has_changed ) {
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return;
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}
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}
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}
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$return = _wp_put_post_revision( $post );
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// If a limit for the number of revisions to keep has been set,
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// delete the oldest ones.
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$revisions_to_keep = wp_revisions_to_keep( $post );
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if ( $revisions_to_keep < 0 ) {
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return $return;
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}
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$revisions = wp_get_post_revisions( $post_id, array( 'order' => 'ASC' ) );
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$delete = count( $revisions ) - $revisions_to_keep;
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if ( $delete < 1 ) {
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return $return;
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}
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$revisions = array_slice( $revisions, 0, $delete );
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for ( $i = 0; isset( $revisions[ $i ] ); $i++ ) {
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if ( false !== strpos( $revisions[ $i ]->post_name, 'autosave' ) ) {
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continue;
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}
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wp_delete_post_revision( $revisions[ $i ]->ID );
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}
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return $return;
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}
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/**
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* Retrieve the autosaved data of the specified post.
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*
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* Returns a post object containing the information that was autosaved for the
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* specified post. If the optional $user_id is passed, returns the autosave for that user
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* otherwise returns the latest autosave.
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*
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* @since 2.6.0
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*
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* @param int $post_id The post ID.
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* @param int $user_id Optional The post author ID.
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* @return WP_Post|false The autosaved data or false on failure or when no autosave exists.
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*/
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function wp_get_post_autosave( $post_id, $user_id = 0 ) {
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$revisions = wp_get_post_revisions( $post_id, array( 'check_enabled' => false ) );
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foreach ( $revisions as $revision ) {
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if ( false !== strpos( $revision->post_name, "{$post_id}-autosave" ) ) {
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if ( $user_id && $user_id != $revision->post_author ) {
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continue;
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}
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return $revision;
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}
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}
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return false;
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}
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/**
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* Determines if the specified post is a revision.
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*
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* @since 2.6.0
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*
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* @param int|WP_Post $post Post ID or post object.
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* @return int|false ID of revision's parent on success, false if not a revision.
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*/
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function wp_is_post_revision( $post ) {
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$post = wp_get_post_revision( $post );
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if ( ! $post ) {
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return false;
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}
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return (int) $post->post_parent;
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}
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/**
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* Determines if the specified post is an autosave.
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*
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* @since 2.6.0
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*
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* @param int|WP_Post $post Post ID or post object.
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* @return int|false ID of autosave's parent on success, false if not a revision.
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*/
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function wp_is_post_autosave( $post ) {
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$post = wp_get_post_revision( $post );
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if ( ! $post ) {
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return false;
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}
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if ( false !== strpos( $post->post_name, "{$post->post_parent}-autosave" ) ) {
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return (int) $post->post_parent;
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}
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return false;
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}
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/**
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* Inserts post data into the posts table as a post revision.
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*
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* @since 2.6.0
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* @access private
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*
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* @param int|WP_Post|array|null $post Post ID, post object OR post array.
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* @param bool $autosave Optional. Is the revision an autosave?
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* @return int|WP_Error WP_Error or 0 if error, new revision ID if success.
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*/
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function _wp_put_post_revision( $post = null, $autosave = false ) {
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if ( is_object( $post ) ) {
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$post = get_object_vars( $post );
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} elseif ( ! is_array( $post ) ) {
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$post = get_post( $post, ARRAY_A );
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}
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if ( ! $post || empty( $post['ID'] ) ) {
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return new WP_Error( 'invalid_post', __( 'Invalid post ID.' ) );
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}
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if ( isset( $post['post_type'] ) && 'revision' == $post['post_type'] ) {
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return new WP_Error( 'post_type', __( 'Cannot create a revision of a revision' ) );
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}
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$post = _wp_post_revision_data( $post, $autosave );
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$post = wp_slash( $post ); //since data is from db
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$revision_id = wp_insert_post( $post );
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if ( is_wp_error( $revision_id ) ) {
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return $revision_id;
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}
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if ( $revision_id ) {
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/**
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* Fires once a revision has been saved.
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*
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* @since 2.6.0
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*
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* @param int $revision_id Post revision ID.
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*/
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do_action( '_wp_put_post_revision', $revision_id );
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}
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return $revision_id;
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}
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/**
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* Gets a post revision.
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*
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* @since 2.6.0
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*
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* @param int|WP_Post $post The post ID or object.
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* @param string $output Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which correspond to
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* a WP_Post object, an associative array, or a numeric array, respectively. Default OBJECT.
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* @param string $filter Optional sanitation filter. See sanitize_post().
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* @return WP_Post|array|null WP_Post (or array) on success, or null on failure.
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*/
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function wp_get_post_revision( &$post, $output = OBJECT, $filter = 'raw' ) {
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$revision = get_post( $post, OBJECT, $filter );
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if ( ! $revision ) {
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return $revision;
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}
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if ( 'revision' !== $revision->post_type ) {
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return null;
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}
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if ( $output == OBJECT ) {
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return $revision;
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} elseif ( $output == ARRAY_A ) {
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$_revision = get_object_vars( $revision );
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return $_revision;
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} elseif ( $output == ARRAY_N ) {
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$_revision = array_values( get_object_vars( $revision ) );
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return $_revision;
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}
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return $revision;
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}
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/**
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* Restores a post to the specified revision.
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*
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* Can restore a past revision using all fields of the post revision, or only selected fields.
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*
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* @since 2.6.0
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*
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* @param int|WP_Post $revision_id Revision ID or revision object.
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* @param array $fields Optional. What fields to restore from. Defaults to all.
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* @return int|false|null Null if error, false if no fields to restore, (int) post ID if success.
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*/
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function wp_restore_post_revision( $revision_id, $fields = null ) {
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$revision = wp_get_post_revision( $revision_id, ARRAY_A );
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if ( ! $revision ) {
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return $revision;
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}
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if ( ! is_array( $fields ) ) {
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$fields = array_keys( _wp_post_revision_fields( $revision ) );
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}
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$update = array();
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foreach ( array_intersect( array_keys( $revision ), $fields ) as $field ) {
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$update[ $field ] = $revision[ $field ];
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}
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if ( ! $update ) {
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return false;
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}
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$update['ID'] = $revision['post_parent'];
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$update = wp_slash( $update ); //since data is from db
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$post_id = wp_update_post( $update );
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if ( ! $post_id || is_wp_error( $post_id ) ) {
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return $post_id;
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}
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// Update last edit user
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update_post_meta( $post_id, '_edit_last', get_current_user_id() );
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/**
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* Fires after a post revision has been restored.
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*
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* @since 2.6.0
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*
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* @param int $post_id Post ID.
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* @param int $revision_id Post revision ID.
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*/
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do_action( 'wp_restore_post_revision', $post_id, $revision['ID'] );
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return $post_id;
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}
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/**
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* Deletes a revision.
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*
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* Deletes the row from the posts table corresponding to the specified revision.
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*
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* @since 2.6.0
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*
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* @param int|WP_Post $revision_id Revision ID or revision object.
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* @return array|false|WP_Post|WP_Error|null Null or WP_Error if error, deleted post if success.
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*/
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function wp_delete_post_revision( $revision_id ) {
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$revision = wp_get_post_revision( $revision_id );
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if ( ! $revision ) {
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return $revision;
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}
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$delete = wp_delete_post( $revision->ID );
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if ( $delete ) {
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/**
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* Fires once a post revision has been deleted.
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*
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* @since 2.6.0
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*
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* @param int $revision_id Post revision ID.
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* @param WP_Post $revision Post revision object.
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*/
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do_action( 'wp_delete_post_revision', $revision->ID, $revision );
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}
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return $delete;
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}
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/**
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* Returns all revisions of specified post.
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*
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* @since 2.6.0
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*
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* @see get_children()
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*
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* @param int|WP_Post $post_id Optional. Post ID or WP_Post object. Default is global `$post`.
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* @param array|null $args Optional. Arguments for retrieving post revisions. Default null.
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* @return array An array of revisions, or an empty array if none.
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*/
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function wp_get_post_revisions( $post_id = 0, $args = null ) {
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$post = get_post( $post_id );
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if ( ! $post || empty( $post->ID ) ) {
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return array();
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}
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$defaults = array(
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'order' => 'DESC',
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'orderby' => 'date ID',
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'check_enabled' => true,
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);
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$args = wp_parse_args( $args, $defaults );
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if ( $args['check_enabled'] && ! wp_revisions_enabled( $post ) ) {
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return array();
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}
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$args = array_merge(
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$args,
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array(
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'post_parent' => $post->ID,
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'post_type' => 'revision',
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'post_status' => 'inherit',
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)
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);
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$revisions = get_children( $args );
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if ( ! $revisions ) {
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return array();
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}
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return $revisions;
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}
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/**
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* Determine if revisions are enabled for a given post.
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*
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* @since 3.6.0
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*
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* @param WP_Post $post The post object.
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* @return bool True if number of revisions to keep isn't zero, false otherwise.
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*/
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function wp_revisions_enabled( $post ) {
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return wp_revisions_to_keep( $post ) !== 0;
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}
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/**
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* Determine how many revisions to retain for a given post.
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*
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* By default, an infinite number of revisions are kept.
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*
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* The constant WP_POST_REVISIONS can be set in wp-config to specify the limit
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* of revisions to keep.
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*
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* @since 3.6.0
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*
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* @param WP_Post $post The post object.
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* @return int The number of revisions to keep.
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*/
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function wp_revisions_to_keep( $post ) {
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$num = WP_POST_REVISIONS;
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if ( true === $num ) {
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$num = -1;
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} else {
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$num = intval( $num );
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}
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if ( ! post_type_supports( $post->post_type, 'revisions' ) ) {
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$num = 0;
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}
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/**
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* Filters the number of revisions to save for the given post.
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*
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* Overrides the value of WP_POST_REVISIONS.
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*
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* @since 3.6.0
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*
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* @param int $num Number of revisions to store.
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* @param WP_Post $post Post object.
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*/
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return (int) apply_filters( 'wp_revisions_to_keep', $num, $post );
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}
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/**
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* Sets up the post object for preview based on the post autosave.
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*
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* @since 2.7.0
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* @access private
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*
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* @param WP_Post $post
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* @return WP_Post|false
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*/
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function _set_preview( $post ) {
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if ( ! is_object( $post ) ) {
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return $post;
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}
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$preview = wp_get_post_autosave( $post->ID );
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if ( ! is_object( $preview ) ) {
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return $post;
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}
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$preview = sanitize_post( $preview );
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$post->post_content = $preview->post_content;
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$post->post_title = $preview->post_title;
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$post->post_excerpt = $preview->post_excerpt;
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add_filter( 'get_the_terms', '_wp_preview_terms_filter', 10, 3 );
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add_filter( 'get_post_metadata', '_wp_preview_post_thumbnail_filter', 10, 3 );
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return $post;
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}
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/**
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* Filters the latest content for preview from the post autosave.
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*
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* @since 2.7.0
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* @access private
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*/
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function _show_post_preview() {
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if ( isset( $_GET['preview_id'] ) && isset( $_GET['preview_nonce'] ) ) {
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$id = (int) $_GET['preview_id'];
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if ( false === wp_verify_nonce( $_GET['preview_nonce'], 'post_preview_' . $id ) ) {
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wp_die( __( 'Sorry, you are not allowed to preview drafts.' ), 403 );
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}
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add_filter( 'the_preview', '_set_preview' );
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}
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}
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/**
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* Filters terms lookup to set the post format.
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*
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* @since 3.6.0
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* @access private
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*
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* @param array $terms
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* @param int $post_id
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* @param string $taxonomy
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* @return array
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*/
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function _wp_preview_terms_filter( $terms, $post_id, $taxonomy ) {
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$post = get_post();
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if ( ! $post ) {
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return $terms;
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}
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if ( empty( $_REQUEST['post_format'] ) || $post->ID != $post_id || 'post_format' != $taxonomy || 'revision' == $post->post_type ) {
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return $terms;
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}
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if ( 'standard' == $_REQUEST['post_format'] ) {
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$terms = array();
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} else {
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$term = get_term_by( 'slug', 'post-format-' . sanitize_key( $_REQUEST['post_format'] ), 'post_format' );
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if ( $term ) {
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$terms = array( $term ); // Can only have one post format
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}
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}
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return $terms;
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}
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/**
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* Filters post thumbnail lookup to set the post thumbnail.
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*
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* @since 4.6.0
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* @access private
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*
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* @param null|array|string $value The value to return - a single metadata value, or an array of values.
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* @param int $post_id Post ID.
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* @param string $meta_key Meta key.
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* @return null|array The default return value or the post thumbnail meta array.
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*/
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function _wp_preview_post_thumbnail_filter( $value, $post_id, $meta_key ) {
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$post = get_post();
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if ( ! $post ) {
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return $value;
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}
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if ( empty( $_REQUEST['_thumbnail_id'] ) ||
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empty( $_REQUEST['preview_id'] ) ||
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$post->ID != $post_id ||
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'_thumbnail_id' != $meta_key ||
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'revision' == $post->post_type ||
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$post_id != $_REQUEST['preview_id'] ) {
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return $value;
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}
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$thumbnail_id = intval( $_REQUEST['_thumbnail_id'] );
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if ( $thumbnail_id <= 0 ) {
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return '';
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}
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return strval( $thumbnail_id );
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}
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/**
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* Gets the post revision version.
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*
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* @since 3.6.0
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* @access private
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*
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* @param WP_Post $revision
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* @return int|false
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*/
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function _wp_get_post_revision_version( $revision ) {
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if ( is_object( $revision ) ) {
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$revision = get_object_vars( $revision );
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} elseif ( ! is_array( $revision ) ) {
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return false;
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}
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if ( preg_match( '/^\d+-(?:autosave|revision)-v(\d+)$/', $revision['post_name'], $matches ) ) {
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return (int) $matches[1];
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}
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return 0;
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}
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/**
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* Upgrade the revisions author, add the current post as a revision and set the revisions version to 1
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*
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* @since 3.6.0
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* @access private
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*
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* @global wpdb $wpdb WordPress database abstraction object.
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*
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* @param WP_Post $post Post object
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* @param array $revisions Current revisions of the post
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* @return bool true if the revisions were upgraded, false if problems
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*/
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function _wp_upgrade_revisions_of_post( $post, $revisions ) {
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global $wpdb;
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// Add post option exclusively
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$lock = "revision-upgrade-{$post->ID}";
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$now = time();
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$result = $wpdb->query( $wpdb->prepare( "INSERT IGNORE INTO `$wpdb->options` (`option_name`, `option_value`, `autoload`) VALUES (%s, %s, 'no') /* LOCK */", $lock, $now ) );
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if ( ! $result ) {
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// If we couldn't get a lock, see how old the previous lock is
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$locked = get_option( $lock );
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if ( ! $locked ) {
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// Can't write to the lock, and can't read the lock.
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// Something broken has happened
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return false;
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}
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if ( $locked > $now - 3600 ) {
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// Lock is not too old: some other process may be upgrading this post. Bail.
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return false;
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}
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// Lock is too old - update it (below) and continue
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}
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// If we could get a lock, re-"add" the option to fire all the correct filters.
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update_option( $lock, $now );
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reset( $revisions );
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$add_last = true;
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do {
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$this_revision = current( $revisions );
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$prev_revision = next( $revisions );
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$this_revision_version = _wp_get_post_revision_version( $this_revision );
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// Something terrible happened
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if ( false === $this_revision_version ) {
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continue;
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}
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// 1 is the latest revision version, so we're already up to date.
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// No need to add a copy of the post as latest revision.
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if ( 0 < $this_revision_version ) {
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$add_last = false;
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continue;
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}
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// Always update the revision version
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$update = array(
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'post_name' => preg_replace( '/^(\d+-(?:autosave|revision))[\d-]*$/', '$1-v1', $this_revision->post_name ),
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);
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// If this revision is the oldest revision of the post, i.e. no $prev_revision,
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// the correct post_author is probably $post->post_author, but that's only a good guess.
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// Update the revision version only and Leave the author as-is.
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if ( $prev_revision ) {
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$prev_revision_version = _wp_get_post_revision_version( $prev_revision );
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// If the previous revision is already up to date, it no longer has the information we need :(
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if ( $prev_revision_version < 1 ) {
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$update['post_author'] = $prev_revision->post_author;
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}
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}
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// Upgrade this revision
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$result = $wpdb->update( $wpdb->posts, $update, array( 'ID' => $this_revision->ID ) );
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if ( $result ) {
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wp_cache_delete( $this_revision->ID, 'posts' );
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}
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} while ( $prev_revision );
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delete_option( $lock );
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// Add a copy of the post as latest revision.
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if ( $add_last ) {
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wp_save_post_revision( $post->ID );
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}
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return true;
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}
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