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   1  <?php
   2  /**
   3   * Revisions administration panel.
   4   *
   5   * @package WordPress
   6   * @subpackage Administration
   7   */
   8  
   9  /** WordPress Administration Bootstrap */
  10  require_once ('admin.php');
  11  
  12  wp_enqueue_script('list-revisions');
  13  
  14  wp_reset_vars(array('revision', 'left', 'right', 'diff', 'action'));
  15  
  16  $revision_id = absint($revision);
  17  $diff        = absint($diff);
  18  $left        = absint($left);
  19  $right       = absint($right);
  20  
  21  $redirect = 'edit.php';
  22  
  23  switch ( $action ) :
  24  case 'restore' :
  25      if ( !$revision = wp_get_post_revision( $revision_id ) )
  26          break;
  27      if ( !current_user_can( 'edit_post', $revision->post_parent ) )
  28          break;
  29      if ( !$post = get_post( $revision->post_parent ) )
  30          break;
  31  
  32      if ( ! WP_POST_REVISIONS && !wp_is_post_autosave( $revision ) ) // Revisions disabled and we're not looking at an autosave
  33          break;
  34  
  35      check_admin_referer( "restore-post_$post->ID|$revision->ID" );
  36  
  37      wp_restore_post_revision( $revision->ID );
  38      $redirect = add_query_arg( array( 'message' => 5, 'revision' => $revision->ID ), get_edit_post_link( $post->ID, 'url' ) );
  39      break;
  40  case 'diff' :
  41      if ( !$left_revision  = get_post( $left ) )
  42          break;
  43      if ( !$right_revision = get_post( $right ) )
  44          break;
  45  
  46      if ( !current_user_can( 'read_post', $left_revision->ID ) || !current_user_can( 'read_post', $right_revision->ID ) )
  47          break;
  48  
  49      // If we're comparing a revision to itself, redirect to the 'view' page for that revision or the edit page for that post
  50      if ( $left_revision->ID == $right_revision->ID ) {
  51          $redirect = get_edit_post_link( $left_revision->ID );
  52          include ( 'js/revisions-js.php' );
  53          break;
  54      }
  55  
  56      // Don't allow reverse diffs?
  57      if ( strtotime($right_revision->post_modified_gmt) < strtotime($left_revision->post_modified_gmt) ) {
  58          $redirect = add_query_arg( array( 'left' => $right, 'right' => $left ) );
  59          break;
  60      }
  61  
  62      if ( $left_revision->ID == $right_revision->post_parent ) // right is a revision of left
  63          $post =& $left_revision;
  64      elseif ( $left_revision->post_parent == $right_revision->ID ) // left is a revision of right
  65          $post =& $right_revision;
  66      elseif ( $left_revision->post_parent == $right_revision->post_parent ) // both are revisions of common parent
  67          $post = get_post( $left_revision->post_parent );
  68      else
  69          break; // Don't diff two unrelated revisions
  70  
  71      if ( ! WP_POST_REVISIONS ) { // Revisions disabled
  72          if (
  73              // we're not looking at an autosave
  74              ( !wp_is_post_autosave( $left_revision ) && !wp_is_post_autosave( $right_revision ) )
  75          ||
  76              // we're not comparing an autosave to the current post
  77              ( $post->ID !== $left_revision->ID && $post->ID !== $right_revision->ID )
  78          )
  79              break;
  80      }
  81  
  82      if (
  83          // They're the same
  84          $left_revision->ID == $right_revision->ID
  85      ||
  86          // Neither is a revision
  87          ( !wp_get_post_revision( $left_revision->ID ) && !wp_get_post_revision( $right_revision->ID ) )
  88      )
  89          break;
  90  
  91      $post_title = '<a href="' . get_edit_post_link() . '">' . get_the_title() . '</a>';
  92      $h2 = sprintf( __( 'Compare Revisions of &#8220;%1$s&#8221;' ), $post_title );
  93  
  94      $left  = $left_revision->ID;
  95      $right = $right_revision->ID;
  96  
  97      $redirect = false;
  98      break;
  99  case 'view' :
 100  default :
 101      if ( !$revision = wp_get_post_revision( $revision_id ) )
 102          break;
 103      if ( !$post = get_post( $revision->post_parent ) )
 104          break;
 105  
 106      if ( !current_user_can( 'read_post', $revision->ID ) || !current_user_can( 'read_post', $post->ID ) )
 107          break;
 108  
 109      if ( ! WP_POST_REVISIONS && !wp_is_post_autosave( $revision ) ) // Revisions disabled and we're not looking at an autosave
 110          break;
 111  
 112      $post_type_object = get_post_type_object($post->post_type);
 113  
 114      $post_title = '<a href="' . get_edit_post_link() . '">' . get_the_title() . '</a>';
 115      $revision_title = wp_post_revision_title( $revision, false );
 116      $h2 = sprintf( __( 'Revision for &#8220;%1$s&#8221; created on %2$s' ), $post_title, $revision_title );
 117      $title = __( 'Revisions' );
 118  
 119      // Sets up the diff radio buttons
 120      $left  = $revision->ID;
 121      $right = $post->ID;
 122  
 123      $redirect = false;
 124      break;
 125  endswitch;
 126  
 127  if ( !$redirect ) {
 128      if ( empty($post->post_type) ) // Empty post_type means either malformed object found, or no valid parent was found.
 129          $redirect = 'edit.php';
 130      elseif ( !post_type_supports($post->post_type, 'revisions') )
 131          $redirect = 'edit.php?post_type=' . $post->post_type;
 132  }
 133  
 134  if ( !empty($redirect) ) {
 135      wp_redirect( $redirect );
 136      exit;
 137  }
 138  
 139  // This is so that the correct "Edit" menu item is selected.
 140  if ( !empty($post->post_type) && 'post' != $post->post_type )
 141      $parent_file = $submenu_file = 'edit.php?post_type=' . $post->post_type;
 142  else
 143      $parent_file = $submenu_file = 'edit.php';
 144  
 145  require_once ( 'admin-header.php' );
 146  
 147  ?>
 148  
 149  <div class="wrap">
 150  
 151  <h2 class="long-header"><?php echo $h2; ?></h2>
 152  
 153  <table class="form-table ie-fixed">
 154      <col class="th" />
 155  <?php if ( 'diff' == $action ) : ?>
 156  <tr id="revision">
 157      <th scope="row"></th>
 158      <th scope="col" class="th-full">
 159          <span class="alignleft"><?php printf( __('Older: %s'), wp_post_revision_title( $left_revision ) ); ?></span>
 160          <span class="alignright"><?php printf( __('Newer: %s'), wp_post_revision_title( $right_revision ) ); ?></span>
 161      </th>
 162  </tr>
 163  <?php endif;
 164  
 165  // use get_post_to_edit filters?
 166  $identical = true;
 167  foreach ( _wp_post_revision_fields() as $field => $field_title ) :
 168      if ( 'diff' == $action ) {
 169          $left_content = apply_filters( "_wp_post_revision_field_$field", $left_revision->$field, $field );
 170          $right_content = apply_filters( "_wp_post_revision_field_$field", $right_revision->$field, $field );
 171          if ( !$content = wp_text_diff( $left_content, $right_content ) )
 172              continue; // There is no difference between left and right
 173          $identical = false;
 174      } else {
 175          add_filter( "_wp_post_revision_field_$field", 'htmlspecialchars' );
 176          $content = apply_filters( "_wp_post_revision_field_$field", $revision->$field, $field );
 177      }
 178      ?>
 179  
 180      <tr id="revision-field-<?php echo $field; ?>">
 181          <th scope="row"><?php echo esc_html( $field_title ); ?></th>
 182          <td><div class="pre"><?php echo $content; ?></div></td>
 183      </tr>
 184  
 185      <?php
 186  
 187  endforeach;
 188  
 189  if ( 'diff' == $action && $identical ) :
 190  
 191      ?>
 192  
 193      <tr><td colspan="2"><div class="updated"><p><?php _e( 'These revisions are identical.' ); ?></p></div></td></tr>
 194  
 195      <?php
 196  
 197  endif;
 198  
 199  ?>
 200  
 201  </table>
 202  
 203  <br class="clear" />
 204  
 205  <h2><?php echo $title; ?></h2>
 206  
 207  <?php
 208  
 209  $args = array( 'format' => 'form-table', 'parent' => true, 'right' => $right, 'left' => $left );
 210  if ( ! WP_POST_REVISIONS )
 211      $args['type'] = 'autosave';
 212  
 213  wp_list_post_revisions( $post, $args );
 214  
 215  ?>
 216  
 217  </div>
 218  
 219  <?php
 220  
 221  require_once ( 'admin-footer.php' );