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Fix a longstanding "off by one" revision authorship bug.

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* Fixes old revision data on the fly when you open a post for editing.
* Uses post_name of revisions to store a post version number (-v1), so we know what has been fixed.
* Latest version should also have a revision stored, whereas before it did not.

props adamsilverstein, mdawaffe. fixes #16215.

git-svn-id: http://core.svn.wordpress.org/trunk@23823 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This commit is contained in:
Mark Jaquith 2013-03-27 20:21:38 +00:00
parent d1d2a3a3ff
commit cccb2939db
4 changed files with 187 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
wp-admin/post.php
View File

@ -135,6 +135,7 @@ case 'edit':
$p = $post_id;
if ( empty($post->ID) )
wp_die( __('You attempted to edit an item that doesn’t exist. Perhaps it was deleted?') );
@ -153,6 +154,9 @@ case 'edit':
exit();
}
//upgrade any old bad revision data (#16215)
_wp_upgrade_revisions_of_post( $p );
$post_type = $post->post_type;
if ( 'post' == $post_type ) {
$parent_file = "edit.php";

2
wp-includes/default-filters.php
View File

@ -250,7 +250,7 @@ add_action( 'init', 'smilies_init',
add_action( 'plugins_loaded', 'wp_maybe_load_widgets', 0 );
add_action( 'plugins_loaded', 'wp_maybe_load_embeds', 0 );
add_action( 'shutdown', 'wp_ob_end_flush_all', 1 );
add_action( 'pre_post_update', 'wp_save_post_revision', 10, 2 );
add_action( 'post_updated', 'wp_save_post_revision', 10, 1 );
add_action( 'publish_post', '_publish_post_hook', 5, 1 );
add_action( 'transition_post_status', '_transition_post_status', 5, 3 );
add_action( 'transition_post_status', '_update_term_count_on_transition_post_status', 10, 3 );

2
wp-includes/post.php
View File

@ -3012,7 +3012,7 @@ function check_and_publish_future_post($post_id) {
* @return string unique slug for the post, based on $post_name (with a -1, -2, etc. suffix)
*/
function wp_unique_post_slug( $slug, $post_ID, $post_status, $post_type, $post_parent ) {
if ( in_array( $post_status, array( 'draft', 'pending', 'auto-draft' ) ) )
if ( in_array( $post_status, array( 'draft', 'pending', 'auto-draft' ) ) || ( 'inherit' == $post_status && 'revision' == $post_type ) )
return $slug;
global $wpdb, $wp_rewrite;

197
wp-includes/revision.php
View File

@ -52,9 +52,10 @@ function _wp_post_revision_fields( $post = null, $autosave = false ) {
$return['post_parent'] = $post['ID'];
$return['post_status'] = 'inherit';
$return['post_type'] = 'revision';
$return['post_name'] = $autosave ? "$post[ID]-autosave" : "$post[ID]-revision";
$return['post_name'] = $autosave ? "$post[ID]-autosave-v1" : "$post[ID]-revision-v1"; // "1" is the revisioning system version
$return['post_date'] = isset($post['post_modified']) ? $post['post_modified'] : '';
$return['post_date_gmt'] = isset($post['post_modified_gmt']) ? $post['post_modified_gmt'] : '';
$return['post_author'] = get_post_meta( $post['ID'], '_edit_last', true );
return $return;
}
@ -62,19 +63,27 @@ function _wp_post_revision_fields( $post = null, $autosave = false ) {
/**
* Saves an already existing post as a post revision.
*
* Typically used immediately prior to post updates.
* Typically used immediately prior and after post updates.
* Prior to update checks for old revision data (latest revision != current post before update) and adds a copy of the current post as a revision if missing
* After update adds a copy of the current post as a revision, so latest revision always matches current post
*
* @package WordPress
* @subpackage Post_Revisions
* @since 2.6.0
*
* @uses _wp_put_post_revision()
* @uses wp_first_revision_matches_current_version()
*
* @param int $post_id The ID of the post to save as a revision.
* @return mixed Null or 0 if error, new revision ID, if success.
*/
function wp_save_post_revision( $post_id, $new_data = null ) {
// We do autosaves manually with wp_create_post_autosave()
function wp_save_post_revision( $post_id ) {
//check to see if the post's first revision already matches the post data
//should be true before post update, _except_ for old data which
//doesn't include a copy of the current post data in revisions
if ( wp_first_revision_matches_current_version( $post_id ) )
return;
if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE )
return;
@ -90,18 +99,32 @@ function wp_save_post_revision( $post_id, $new_data = null ) {
if ( ! post_type_supports( $post['post_type'], 'revisions' ) )
return;
// if new data is supplied, check that it is different from last saved revision, unless a plugin tells us to always save regardless
if ( apply_filters( 'wp_save_post_revision_check_for_changes', true, $post, $new_data ) && is_array( $new_data ) ) {
$post_has_changed = false;
foreach ( array_keys( _wp_post_revision_fields() ) as $field ) {
if ( normalize_whitespace( $new_data[ $field ] ) != normalize_whitespace( $post[ $field ] ) ) {
$post_has_changed = true;
break;
// compare the proposed update with the last stored revision, verify
// different, unless a plugin tells us to always save regardless
if ( $revisions = wp_get_post_revisions( $post_id ) ) {
// grab the last revision
$last_revision = array_shift( $revisions );
//if no previous revisions, save one for sure
if ( $last_revision_array = get_post( $last_revision->ID, ARRAY_A ) ) {
if ( apply_filters( 'wp_save_post_revision_check_for_changes', true, $last_revision_array, $post ) && is_array( $post ) ) {
$post_has_changed = false;
foreach ( array_keys( _wp_post_revision_fields() ) as $field ) {
if ( normalize_whitespace( $post[ $field ] ) != normalize_whitespace( $last_revision_array[ $field ] ) ) {
$post_has_changed = true;
break;
}
}
//don't save revision if post unchanged
if( ! $post_has_changed )
return;
}
}
//don't save revision if post unchanged
if( ! $post_has_changed )
return;
}
$return = _wp_put_post_revision( $post );
@ -122,9 +145,9 @@ function wp_save_post_revision( $post_id, $new_data = null ) {
$revisions = array_slice( $revisions, 0, $delete );
for ( $i = 0; isset($revisions[$i]); $i++ ) {
if ( false !== strpos( $revisions[$i]->post_name, 'autosave' ) )
if ( false !== strpos( $revisions[ $i ]->post_name, 'autosave' ) )
continue;
wp_delete_post_revision( $revisions[$i]->ID );
wp_delete_post_revision( $revisions[ $i ]->ID );
}
return $return;
@ -441,6 +464,148 @@ function _set_preview($post) {
return $post;
}
function _wp_get_post_revision_version( $post ) {
if ( is_array( $post ) ) {
if ( ! isset( $post['post_name'] ) ) {
return false;
}
$name = $post['post_name'];
} elseif ( is_object( $post ) ) {
if ( ! isset( $post->post_name ) ) {
return false;
}
$name = $post->post_name;
} else {
return false;
}
if ( ! preg_match( '/^(\d+-)(?:autosave|revision)(?:-v)(\d+)$/', $name, $matches ) ) {
return 0;
}
if ( '1' === $matches[2] ) {
return 1;
}
return 0;
}
/**
* Upgrade the data
*
* @package WordPress
* @subpackage Post_Revisions
* @since 3.6.0
*
* @uses get_post()
* @uses post_type_supports()
* @uses wp_get_post_revisions()
* @uses wp_save_post_revision()
*
* @param int|object $post_id Post ID or post object
* @return true if success, false if problems
*/
function _wp_upgrade_revisions_of_post( $post ) {
global $wpdb;
$post = get_post( $post );
if ( ! $post )
return false;
//make sure we have a current revision, only adds one if missing
wp_save_post_revision( $post->ID );
if ( ! post_type_supports( $post->post_type, 'revisions' ) )
return false;
$revisions = wp_get_post_revisions( $post->ID ); // array( 'order' => 'DESC', 'orderby' => 'date' ); // Always work from most recent to oldest
if ( ! $revisions )
return true;
// Add post option exclusively
$lock = "revision-upgrade-{$post->ID}";
$locked_at = number_format( microtime( true ), 10, '.', '' );
$result = $wpdb->query( $wpdb->prepare( "INSERT IGNORE INTO `$wpdb->options` (`option_name`, `option_value`, `autoload`) VALUES (%s, %s, 'no') /* LOCK */", $lock, $locked_at ) );
if ( ! $result ) {
// If we couldn't get a lock, see how old the previous lock is
$locked_at = get_option( $lock );
if ( !$locked_at ) {
// Can't write to the lock, and can't read the lock.
// Something broken has happened
return false;
}
if ( $lock_at < number_format( microtime( true ), 10, '.', '' ) - 3600 ) {
// Lock is too old - try again
delete_option( $lock );
return wp_upgrade_revisions_of_post( $post );
}
// Lock is not too old: some other process may be upgrading this post. Bail.
return;
} else {
// If we could get a lock, re-"add" the option to fire all the correct filters.
add_option( $lock, $locked_at );
}
$success = true;
reset( $revisions );
do {
$this_revision = current( $revisions );
$prev_revision = next( $revisions );
$this_revision_version = _wp_get_post_revision_version( $this_revision );
error_log($this_revision_version);
// Something terrible happened
if ( false === $this_revision_version )
continue;
// 1 is the latest revision version, so we're already up to date
if ( 0 < $this_revision_version )
continue;
// This revision is the oldest revision of the post.
// The correct post_author is probably $post->post_author, but that's only a good guess.
// Leave un-upgraded.
if ( ! $prev_revision ) {
continue;
}
$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 ( 0 < $prev_revision_version ) {
continue;
}
// Upgrade this revision
// Cast as object so that wp_update_post() handles slashing for us
$update = (object) array(
'ID' => $this_revision->ID,
'post_name' => preg_replace( '/^(\d+-)(autosave|revision)-(\d+)$/', '$1$2-v1', $this_revision->post_name ),
'post_author' => $prev_revision->post_author,
);
//error_log(json_encode($update));
$result = wp_update_post( $update );
if ( ! $result || is_wp_error( $result ) ) {
// Wilhelm!
$success = false;
break;
}
} while ( $prev_revision );
delete_option( $lock );
return true;
}
function _show_post_preview() {
if ( isset($_GET['preview_id']) && isset($_GET['preview_nonce']) ) {