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