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3dbba0fff3
Previously, changing the post thumbnail of a published post in the edit screen would immediately apply the change, rather than waiting for the post to be saved before applying the update. This could lead to someone unintentionally editing the post thumbnail on a published post, and made it impossible to preview changes to post thumbnails on published posts before saving the change. This introduces a new Ajax handler, `wp_ajax_get_post_thumbnail_html()` to retrieve the HTML for the post thumbnail meta box without updating the post meta value for `_thumbnail_id`. It also allows post thumbnail changes to be previewed by passing the `_thumbnail_id` as a query variable to the preview screen and adding a new filter, `_wp_preview_post_thumbnail_filter()`, which gets applied to `get_post_metadata` during the post preview process. Props flixos90. Fixes #12922. Built from https://develop.svn.wordpress.org/trunk@38118 git-svn-id: http://core.svn.wordpress.org/trunk@38059 1a063a9b-81f0-0310-95a4-ce76da25c4cd
721 lines
20 KiB
PHP
721 lines
20 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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if ( ! $post = get_post( $post_id ) )
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return;
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if ( ! post_type_supports( $post->post_type, 'revisions' ) )
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return;
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if ( 'auto-draft' == $post->post_status )
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return;
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if ( ! wp_revisions_enabled( $post ) )
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return;
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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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if ( $revisions = wp_get_post_revisions( $post_id ) ) {
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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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*/
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if ( isset( $last_revision ) && apply_filters( 'wp_save_post_revision_check_for_changes', $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 $post The post object.
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*
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*/
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$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 $return;
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$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 $return;
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$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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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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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 false|int False if not a revision, ID of revision's parent otherwise.
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*/
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function wp_is_post_revision( $post ) {
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if ( !$post = wp_get_post_revision( $post ) )
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return false;
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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 false|int False if not a revision, ID of autosave's parent otherwise
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*/
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function wp_is_post_autosave( $post ) {
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if ( !$post = wp_get_post_revision( $post ) )
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return false;
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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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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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if ( ! $post || empty($post['ID']) )
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return new WP_Error( 'invalid_post', __( 'Invalid post ID.' ) );
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if ( isset($post['post_type']) && 'revision' == $post['post_type'] )
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return new WP_Error( 'post_type', __( 'Cannot create a revision of a revision' ) );
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$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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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. OBJECT, ARRAY_A, or ARRAY_N.
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* @param string $filter Optional sanitation filter. See sanitize_post().
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* @return WP_Post|array|null Null if error or post object if success.
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*/
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function wp_get_post_revision(&$post, $output = OBJECT, $filter = 'raw') {
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if ( !$revision = get_post( $post, OBJECT, $filter ) )
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return $revision;
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if ( 'revision' !== $revision->post_type )
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return null;
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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, $fields = null ) {
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if ( !$revision = wp_get_post_revision( $revision_id, ARRAY_A ) )
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return $revision;
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if ( !is_array( $fields ) )
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$fields = array_keys( _wp_post_revision_fields( $revision ) );
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$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 ( !$update )
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return false;
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$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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// 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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if ( ! $revision = wp_get_post_revision( $revision_id ) ) {
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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 object|array $revision Post revision object or array.
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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( $post->ID ) )
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return array();
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$defaults = array( 'order' => 'DESC', 'orderby' => 'date ID', 'check_enabled' => true );
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$args = wp_parse_args( $args, $defaults );
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if ( $args['check_enabled'] && ! wp_revisions_enabled( $post ) )
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return array();
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$args = array_merge( $args, array( 'post_parent' => $post->ID, 'post_type' => 'revision', 'post_status' => 'inherit' ) );
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if ( ! $revisions = get_children( $args ) )
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return array();
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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
|
|
*
|
|
* @param WP_Post $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;
|
|
|
|
/**
|
|
* Filters the number of revisions to save for the given post.
|
|
*
|
|
* Overrides the value of WP_POST_REVISIONS.
|
|
*
|
|
* @since 3.6.0
|
|
*
|
|
* @param int $num Number of revisions to store.
|
|
* @param WP_Post $post Post object.
|
|
*/
|
|
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
|
|
*
|
|
* @param WP_Post $post
|
|
* @return WP_Post|false
|
|
*/
|
|
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 );
|
|
add_filter( 'get_post_metadata', '_wp_preview_post_thumbnail_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( __('Sorry, you are not allowed to preview drafts.') );
|
|
|
|
add_filter('the_preview', '_set_preview');
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Filters terms lookup to set the post format.
|
|
*
|
|
* @since 3.6.0
|
|
* @access private
|
|
*
|
|
* @param array $terms
|
|
* @param int $post_id
|
|
* @param string $taxonomy
|
|
* @return array
|
|
*/
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* Filters post thumbnail lookup to set the post thumbnail.
|
|
*
|
|
* @since 4.6.0
|
|
* @access private
|
|
*
|
|
* @param null|array|string $value The value to return - a single metadata value, or an array of values.
|
|
* @param int $post_id Post ID.
|
|
* @param string $meta_key Meta key.
|
|
* @return null|array The default return value or the post thumbnail meta array.
|
|
*/
|
|
function _wp_preview_post_thumbnail_filter( $value, $post_id, $meta_key ) {
|
|
if ( ! $post = get_post() ) {
|
|
return $value;
|
|
}
|
|
|
|
if ( empty( $_REQUEST['_thumbnail_id'] ) || $post->ID != $post_id || '_thumbnail_id' != $meta_key || 'revision' == $post->post_type ) {
|
|
return $value;
|
|
}
|
|
|
|
$thumbnail_id = intval( $_REQUEST['_thumbnail_id'] );
|
|
if ( $thumbnail_id <= 0 ) {
|
|
return '';
|
|
}
|
|
|
|
return strval( $thumbnail_id );
|
|
}
|
|
|
|
/**
|
|
* Gets the post revision version.
|
|
*
|
|
* @since 3.6.0
|
|
* @access private
|
|
*
|
|
* @param WP_Post $revision
|
|
* @return int|false
|
|
*/
|
|
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
|
|
*
|
|
* @global wpdb $wpdb WordPress database abstraction object.
|
|
*
|
|
* @param WP_Post $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;
|
|
}
|