+/**
+ * Mark the post as currently being edited by the current user
+ *
+ * @since 2.5.0
+ *
+ * @param int $post_id ID of the post to being edited
+ * @return bool|array Returns false if the post doesn't exist of there is no current user, or
+ * an array of the lock time and the user ID.
+ */
+function wp_set_post_lock( $post_id ) {
+ if ( !$post = get_post( $post_id ) )
+ return false;
+ if ( 0 == ($user_id = get_current_user_id()) )
+ return false;
+
+ $now = time();
+ $lock = "$now:$user_id";
+
+ update_post_meta( $post->ID, '_edit_lock', $lock );
+ return array( $now, $user_id );
+}
+
+/**
+ * Outputs the HTML for the notice to say that someone else is editing or has taken over editing of this post.
+ *
+ * @since 2.8.5
+ * @return none
+ */
+function _admin_notice_post_locked() {
+ if ( ! $post = get_post() )
+ return;
+
+ $user = null;
+ if ( $user_id = wp_check_post_lock( $post->ID ) )
+ $user = get_userdata( $user_id );
+
+ if ( $user ) {
+ if ( ! apply_filters( 'show_post_locked_dialog', true, $post, $user ) )
+ return;
+
+ $locked = true;
+ } else {
+ $locked = false;
+ }
+
+ if ( $locked && ( $sendback = wp_get_referer() ) &&
+ false === strpos( $sendback, 'post.php' ) && false === strpos( $sendback, 'post-new.php' ) ) {
+
+ $sendback_text = __('Go back');
+ } else {
+ $sendback = admin_url( 'edit.php' );
+
+ if ( 'post' != $post->post_type )
+ $sendback = add_query_arg( 'post_type', $post->post_type, $sendback );
+
+ $sendback_text = get_post_type_object( $post->post_type )->labels->all_items;
+ }
+
+ $hidden = $locked ? '' : ' hidden';
+
+ ?>
+ <div id="post-lock-dialog" class="notification-dialog-wrap<?php echo $hidden; ?>">
+ <div class="notification-dialog-background"></div>
+ <div class="notification-dialog">
+ <?php
+
+ if ( $locked ) {
+ if ( get_post_type_object( $post->post_type )->public ) {
+ $preview_link = set_url_scheme( add_query_arg( 'preview', 'true', get_permalink( $post->ID ) ) );
+
+ if ( 'publish' == $post->post_status || $user->ID != $post->post_author ) {
+ // Latest content is in autosave
+ $nonce = wp_create_nonce( 'post_preview_' . $post->ID );
+ $preview_link = add_query_arg( array( 'preview_id' => $post->ID, 'preview_nonce' => $nonce ), $preview_link );
+ }
+ } else {
+ $preview_link = '';
+ }
+
+ $preview_link = apply_filters( 'preview_post_link', $preview_link );
+ $override = apply_filters( 'override_post_lock', true, $post, $user );
+ $tab_last = $override ? '' : ' wp-tab-last';
+
+ ?>
+ <div class="post-locked-message">
+ <div class="post-locked-avatar"><?php echo get_avatar( $user->ID, 64 ); ?></div>
+ <p class="currently-editing wp-tab-first" tabindex="0">
+ <?php
+ _e( 'This content is currently locked.' );
+ if ( $override )
+ printf( ' ' . __( 'If you take over, %s will be blocked from continuing to edit.' ), esc_html( $user->display_name ) );
+ ?>
+ </p>
+ <?php do_action( 'post_locked_dialog', $post ); ?>
+ <p>
+ <a class="button" href="<?php echo esc_url( $sendback ); ?>"><?php echo $sendback_text; ?></a>
+ <?php if ( $preview_link ) { ?>
+ <a class="button<?php echo $tab_last; ?>" href="<?php echo esc_url( $preview_link ); ?>"><?php _e('Preview'); ?></a>
+ <?php
+ }
+
+ // Allow plugins to prevent some users overriding the post lock
+ if ( $override ) {
+ ?>
+ <a class="button button-primary wp-tab-last" href="<?php echo esc_url( add_query_arg( 'get-post-lock', '1', get_edit_post_link( $post->ID, 'url' ) ) ); ?>"><?php _e('Take over'); ?></a>
+ <?php
+ }
+
+ ?>
+ </p>
+ </div>
+ <?php
+ } else {
+ ?>
+ <div class="post-taken-over">
+ <div class="post-locked-avatar"></div>
+ <p class="wp-tab-first" tabindex="0">
+ <span class="currently-editing"></span><br>
+ <span class="locked-saving hidden"><img src="images/wpspin_light-2x.gif" width="16" height="16" /> <?php _e('Saving revision...'); ?></span>
+ <span class="locked-saved hidden"><?php _e('Your latest changes were saved as a revision.'); ?></span>
+ </p>
+ <?php do_action( 'post_lock_lost_dialog', $post ); ?>
+ <p><a class="button button-primary wp-tab-last" href="<?php echo esc_url( $sendback ); ?>"><?php echo $sendback_text; ?></a></p>
+ </div>
+ <?php
+ }
+
+ ?>
+ </div>
+ </div>
+ <?php
+}
+
+/**
+ * Creates autosave data for the specified post from $_POST data.
+ *
+ * @package WordPress
+ * @subpackage Post_Revisions
+ * @since 2.6.0
+ *
+ * @uses _wp_translate_postdata()
+ * @uses _wp_post_revision_fields()
+ *
+ * @return unknown
+ */
+function wp_create_post_autosave( $post_id ) {
+ $translated = _wp_translate_postdata( true );
+ if ( is_wp_error( $translated ) )
+ return $translated;
+
+ $post_author = get_current_user_id();
+
+ // Store one autosave per author. If there is already an autosave, overwrite it.
+ if ( $old_autosave = wp_get_post_autosave( $post_id, $post_author ) ) {
+ $new_autosave = _wp_post_revision_fields( $_POST, true );
+ $new_autosave['ID'] = $old_autosave->ID;
+ $new_autosave['post_author'] = $post_author;
+
+ // If the new autosave is the same content as the post, delete the old autosave.
+ $post = get_post( $post_id );
+ $autosave_is_different = false;
+ foreach ( array_keys( _wp_post_revision_fields() ) as $field ) {
+ if ( normalize_whitespace( $new_autosave[ $field ] ) != normalize_whitespace( $post->$field ) ) {
+ $autosave_is_different = true;
+ break;
+ }
+ }
+
+ if ( ! $autosave_is_different ) {
+ wp_delete_post_revision( $old_autosave->ID );
+ return;
+ }
+
+ return wp_update_post( $new_autosave );
+ }
+
+ // _wp_put_post_revision() expects unescaped.
+ $post_data = wp_unslash( $_POST );
+
+ // Otherwise create the new autosave as a special post revision
+ return _wp_put_post_revision( $post_data, true );