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   1  <?php
   2  /**
   3   * The block editor page.
   4   *
   5   * @since 5.0.0
   6   *
   7   * @package WordPress
   8   * @subpackage Administration
   9   */
  10  
  11  // Don't load directly.
  12  if ( ! defined( 'ABSPATH' ) ) {
  13      die( '-1' );
  14  }
  15  
  16  /**
  17   * @global string       $post_type
  18   * @global WP_Post_Type $post_type_object
  19   * @global WP_Post      $post             Global post object.
  20   * @global string       $title
  21   * @global array        $wp_meta_boxes
  22   */
  23  global $post_type, $post_type_object, $post, $title, $wp_meta_boxes;
  24  
  25  $block_editor_context = new WP_Block_Editor_Context( array( 'post' => $post ) );
  26  
  27  // Flag that we're loading the block editor.
  28  $current_screen = get_current_screen();
  29  $current_screen->is_block_editor( true );
  30  
  31  // Default to is-fullscreen-mode to avoid jumps in the UI.
  32  add_filter(
  33      'admin_body_class',
  34      static function( $classes ) {
  35          return "$classes is-fullscreen-mode";
  36      }
  37  );
  38  
  39  /*
  40   * Emoji replacement is disabled for now, until it plays nicely with React.
  41   */
  42  remove_action( 'admin_print_scripts', 'print_emoji_detection_script' );
  43  
  44  /*
  45   * Block editor implements its own Options menu for toggling Document Panels.
  46   */
  47  add_filter( 'screen_options_show_screen', '__return_false' );
  48  
  49  wp_enqueue_script( 'heartbeat' );
  50  wp_enqueue_script( 'wp-edit-post' );
  51  
  52  $rest_base = ! empty( $post_type_object->rest_base ) ? $post_type_object->rest_base : $post_type_object->name;
  53  
  54  // Preload common data.
  55  $preload_paths = array(
  56      '/',
  57      '/wp/v2/types?context=edit',
  58      '/wp/v2/taxonomies?per_page=-1&context=edit',
  59      '/wp/v2/themes?status=active',
  60      sprintf( '/wp/v2/%s/%s?context=edit', $rest_base, $post->ID ),
  61      sprintf( '/wp/v2/types/%s?context=edit', $post_type ),
  62      sprintf( '/wp/v2/users/me?post_type=%s&context=edit', $post_type ),
  63      array( '/wp/v2/media', 'OPTIONS' ),
  64      array( '/wp/v2/blocks', 'OPTIONS' ),
  65      sprintf( '/wp/v2/%s/%d/autosaves?context=edit', $rest_base, $post->ID ),
  66  );
  67  
  68  block_editor_rest_api_preload( $preload_paths, $block_editor_context );
  69  
  70  wp_add_inline_script(
  71      'wp-blocks',
  72      sprintf( 'wp.blocks.setCategories( %s );', wp_json_encode( get_block_categories( $post ) ) ),
  73      'after'
  74  );
  75  
  76  /*
  77   * Assign initial edits, if applicable. These are not initially assigned to the persisted post,
  78   * but should be included in its save payload.
  79   */
  80  $initial_edits = null;
  81  $is_new_post   = false;
  82  if ( 'auto-draft' === $post->post_status ) {
  83      $is_new_post = true;
  84      // Override "(Auto Draft)" new post default title with empty string, or filtered value.
  85      $initial_edits = array(
  86          'title'   => $post->post_title,
  87          'content' => $post->post_content,
  88          'excerpt' => $post->post_excerpt,
  89      );
  90  }
  91  
  92  // Preload server-registered block schemas.
  93  wp_add_inline_script(
  94      'wp-blocks',
  95      'wp.blocks.unstable__bootstrapServerSideBlockDefinitions(' . wp_json_encode( get_block_editor_server_block_settings() ) . ');'
  96  );
  97  
  98  // Get admin url for handling meta boxes.
  99  $meta_box_url = admin_url( 'post.php' );
 100  $meta_box_url = add_query_arg(
 101      array(
 102          'post'                  => $post->ID,
 103          'action'                => 'edit',
 104          'meta-box-loader'       => true,
 105          'meta-box-loader-nonce' => wp_create_nonce( 'meta-box-loader' ),
 106      ),
 107      $meta_box_url
 108  );
 109  wp_add_inline_script(
 110      'wp-editor',
 111      sprintf( 'var _wpMetaBoxUrl = %s;', wp_json_encode( $meta_box_url ) ),
 112      'before'
 113  );
 114  
 115  /*
 116   * Get all available templates for the post/page attributes meta-box.
 117   * The "Default template" array element should only be added if the array is
 118   * not empty so we do not trigger the template select element without any options
 119   * besides the default value.
 120   */
 121  $available_templates = wp_get_theme()->get_page_templates( get_post( $post->ID ) );
 122  $available_templates = ! empty( $available_templates ) ? array_replace(
 123      array(
 124          /** This filter is documented in wp-admin/includes/meta-boxes.php */
 125          '' => apply_filters( 'default_page_template_title', __( 'Default template' ), 'rest-api' ),
 126      ),
 127      $available_templates
 128  ) : $available_templates;
 129  
 130  // Lock settings.
 131  $user_id = wp_check_post_lock( $post->ID );
 132  if ( $user_id ) {
 133      $locked = false;
 134  
 135      /** This filter is documented in wp-admin/includes/post.php */
 136      if ( apply_filters( 'show_post_locked_dialog', true, $post, $user_id ) ) {
 137          $locked = true;
 138      }
 139  
 140      $user_details = null;
 141      if ( $locked ) {
 142          $user         = get_userdata( $user_id );
 143          $user_details = array(
 144              'name' => $user->display_name,
 145          );
 146          $avatar       = get_avatar_url( $user_id, array( 'size' => 64 ) );
 147      }
 148  
 149      $lock_details = array(
 150          'isLocked' => $locked,
 151          'user'     => $user_details,
 152      );
 153  } else {
 154      // Lock the post.
 155      $active_post_lock = wp_set_post_lock( $post->ID );
 156      if ( $active_post_lock ) {
 157          $active_post_lock = esc_attr( implode( ':', $active_post_lock ) );
 158      }
 159  
 160      $lock_details = array(
 161          'isLocked'       => false,
 162          'activePostLock' => $active_post_lock,
 163      );
 164  }
 165  
 166  /**
 167   * Filters the body placeholder text.
 168   *
 169   * @since 5.0.0
 170   * @since 5.8.0 Changed the default placeholder text.
 171   *
 172   * @param string  $text Placeholder text. Default 'Type / to choose a block'.
 173   * @param WP_Post $post Post object.
 174   */
 175  $body_placeholder = apply_filters( 'write_your_story', __( 'Type / to choose a block' ), $post );
 176  
 177  $editor_settings = array(
 178      'availableTemplates'                   => $available_templates,
 179      'disablePostFormats'                   => ! current_theme_supports( 'post-formats' ),
 180      /** This filter is documented in wp-admin/edit-form-advanced.php */
 181      'titlePlaceholder'                     => apply_filters( 'enter_title_here', __( 'Add title' ), $post ),
 182      'bodyPlaceholder'                      => $body_placeholder,
 183      'autosaveInterval'                     => AUTOSAVE_INTERVAL,
 184      'styles'                               => get_block_editor_theme_styles(),
 185      'richEditingEnabled'                   => user_can_richedit(),
 186      'postLock'                             => $lock_details,
 187      'postLockUtils'                        => array(
 188          'nonce'       => wp_create_nonce( 'lock-post_' . $post->ID ),
 189          'unlockNonce' => wp_create_nonce( 'update-post_' . $post->ID ),
 190          'ajaxUrl'     => admin_url( 'admin-ajax.php' ),
 191      ),
 192      'supportsLayout'                       => WP_Theme_JSON_Resolver::theme_has_support(),
 193      '__experimentalBlockPatterns'          => WP_Block_Patterns_Registry::get_instance()->get_all_registered(),
 194      '__experimentalBlockPatternCategories' => WP_Block_Pattern_Categories_Registry::get_instance()->get_all_registered(),
 195      'supportsTemplateMode'                 => current_theme_supports( 'block-templates' ),
 196  
 197      // Whether or not to load the 'postcustom' meta box is stored as a user meta
 198      // field so that we're not always loading its assets.
 199      'enableCustomFields'                   => (bool) get_user_meta( get_current_user_id(), 'enable_custom_fields', true ),
 200  );
 201  
 202  $autosave = wp_get_post_autosave( $post->ID );
 203  if ( $autosave ) {
 204      if ( mysql2date( 'U', $autosave->post_modified_gmt, false ) > mysql2date( 'U', $post->post_modified_gmt, false ) ) {
 205          $editor_settings['autosave'] = array(
 206              'editLink' => get_edit_post_link( $autosave->ID ),
 207          );
 208      } else {
 209          wp_delete_post_revision( $autosave->ID );
 210      }
 211  }
 212  
 213  if ( ! empty( $post_type_object->template ) ) {
 214      $editor_settings['template']     = $post_type_object->template;
 215      $editor_settings['templateLock'] = ! empty( $post_type_object->template_lock ) ? $post_type_object->template_lock : false;
 216  }
 217  
 218  // If there's no template set on a new post, use the post format, instead.
 219  if ( $is_new_post && ! isset( $editor_settings['template'] ) && 'post' === $post->post_type ) {
 220      $post_format = get_post_format( $post );
 221      if ( in_array( $post_format, array( 'audio', 'gallery', 'image', 'quote', 'video' ), true ) ) {
 222          $editor_settings['template'] = array( array( "core/$post_format" ) );
 223      }
 224  }
 225  
 226  /**
 227   * Scripts
 228   */
 229  wp_enqueue_media(
 230      array(
 231          'post' => $post->ID,
 232      )
 233  );
 234  wp_tinymce_inline_scripts();
 235  wp_enqueue_editor();
 236  
 237  /**
 238   * Styles
 239   */
 240  wp_enqueue_style( 'wp-edit-post' );
 241  
 242  /**
 243   * Fires after block assets have been enqueued for the editing interface.
 244   *
 245   * Call `add_action` on any hook before 'admin_enqueue_scripts'.
 246   *
 247   * In the function call you supply, simply use `wp_enqueue_script` and
 248   * `wp_enqueue_style` to add your functionality to the block editor.
 249   *
 250   * @since 5.0.0
 251   */
 252  do_action( 'enqueue_block_editor_assets' );
 253  
 254  // In order to duplicate classic meta box behaviour, we need to run the classic meta box actions.
 255  require_once ABSPATH . 'wp-admin/includes/meta-boxes.php';
 256  register_and_do_post_meta_boxes( $post );
 257  
 258  // Check if the Custom Fields meta box has been removed at some point.
 259  $core_meta_boxes = $wp_meta_boxes[ $current_screen->id ]['normal']['core'];
 260  if ( ! isset( $core_meta_boxes['postcustom'] ) || ! $core_meta_boxes['postcustom'] ) {
 261      unset( $editor_settings['enableCustomFields'] );
 262  }
 263  
 264  $editor_settings = get_block_editor_settings( $editor_settings, $block_editor_context );
 265  
 266  $init_script = <<<JS
 267  ( function() {
 268      window._wpLoadBlockEditor = new Promise( function( resolve ) {
 269          wp.domReady( function() {
 270              resolve( wp.editPost.initializeEditor( 'editor', "%s", %d, %s, %s ) );
 271          } );
 272      } );
 273  } )();
 274  JS;
 275  
 276  $script = sprintf(
 277      $init_script,
 278      $post->post_type,
 279      $post->ID,
 280      wp_json_encode( $editor_settings ),
 281      wp_json_encode( $initial_edits )
 282  );
 283  wp_add_inline_script( 'wp-edit-post', $script );
 284  
 285  if ( (int) get_option( 'page_for_posts' ) === $post->ID ) {
 286      add_action( 'admin_enqueue_scripts', '_wp_block_editor_posts_page_notice' );
 287  }
 288  
 289  require_once ABSPATH . 'wp-admin/admin-header.php';
 290  ?>
 291  
 292  <div class="block-editor">
 293      <h1 class="screen-reader-text hide-if-no-js"><?php echo esc_html( $title ); ?></h1>
 294      <div id="editor" class="block-editor__container hide-if-no-js"></div>
 295      <div id="metaboxes" class="hidden">
 296          <?php the_block_editor_meta_boxes(); ?>
 297      </div>
 298  
 299      <?php // JavaScript is disabled. ?>
 300      <div class="wrap hide-if-js block-editor-no-js">
 301          <h1 class="wp-heading-inline"><?php echo esc_html( $title ); ?></h1>
 302          <div class="notice notice-error notice-alt">
 303              <p>
 304                  <?php
 305                      $message = sprintf(
 306                          /* translators: %s: A link to install the Classic Editor plugin. */
 307                          __( 'The block editor requires JavaScript. Please enable JavaScript in your browser settings, or try the <a href="%s">Classic Editor plugin</a>.' ),
 308                          esc_url( wp_nonce_url( self_admin_url( 'plugin-install.php?tab=favorites&user=wordpressdotorg&save=0' ), 'save_wporg_username_' . get_current_user_id() ) )
 309                      );
 310  
 311                      /**
 312                       * Filters the message displayed in the block editor interface when JavaScript is
 313                       * not enabled in the browser.
 314                       *
 315                       * @since 5.0.3
 316                       *
 317                       * @param string  $message The message being displayed.
 318                       * @param WP_Post $post    The post being edited.
 319                       */
 320                      echo apply_filters( 'block_editor_no_javascript_message', $message, $post );
 321                      ?>
 322              </p>
 323          </div>
 324      </div>
 325  </div>