Ticket #49334: 49334.diff

wp-includes/theme.php

@@ -764 +764 @@
         $new_theme = wp_get_theme( $stylesheet );
         $template  = $new_theme->get_template();
 
+        // Test for theme compatibility, die if incompatibility exists.
+        $requirements = validate_theme_requirements( $new_theme );
+        if ( is_wp_error( $requirements ) ) {
+                wp_die( $requirements );
+        }
+
         if ( wp_is_recovery_mode() ) {
                 $paused_themes = wp_paused_themes();
                 $paused_themes->delete( $old_theme->get_stylesheet() );
@@ -880 +886 @@
         return false;
 }
 
+/**
+ * Validate the theme requirements for WP version and PHP version.
+ *
+ * @since 5.5.0
+ *
+ * @param  \WP_Theme $theme Theme object.
+ * @return true|WP_Error True if requirements are met, WP_Error on failure.
+ */
+function validate_theme_requirements( $theme ) {
+        $response         = true;
+        $theme_dir        = "$theme->theme_root/$theme->stylesheet";
+        $theme_data       = array(
+                'requires'     => '',
+                'requires_php' => '',
+        );
+        $requirements_arr = array(
+                'requires'     => 'Requires at least',
+                'requires_php' => 'Requires PHP',
+        );
+
+        // Check for headers in theme readme.
+        if ( file_exists( "$theme_dir/readme.txt" ) ) {
+                $theme_data = get_file_data( "$theme_dir/readme.txt", $requirements_arr, 'theme' );
+        }
+
+        // Check for headers in the themes's style.css file.
+        $stylesheet_data = get_file_data( "$theme_dir/style.css", $requirements_arr, 'theme' );
+        // Give precedence to the stylesheet headers.
+        $theme_data = array_merge( $theme_data, $stylesheet_data );
+
+        $theme_data['wp_compatible']  = is_wp_version_compatible( $theme_data['requires'] );
+        $theme_data['php_compatible'] = is_php_version_compatible( $theme_data['requires_php'] );
+        $theme_data['Name']           = $theme->get( 'Name' );
+
+        if ( ! $theme_data['wp_compatible'] && ! $theme_data['php_compatible'] ) {
+                $response = new WP_Error(
+                        'theme_wp_php_incompatible',
+                        sprintf(
+                                /* translators: %s: Theme name. */
+                                __( '<strong>Error:</strong> Current WordPress and PHP versions do not meet minimum requirements for %s.' ),
+                                $theme_data['Name']
+                        )
+                );
+        } elseif ( ! $theme_data['php_compatible'] ) {
+                $response = new WP_Error(
+                        'theme_php_incompatible',
+                        sprintf(
+                                /* translators: %s: Theme name. */
+                                __( '<strong>Error:</strong> Current PHP version does not meet minimum requirements for %s.' ),
+                                $theme_data['Name']
+                        )
+                );
+        } elseif ( ! $theme_data['wp_compatible'] ) {
+                $response = new WP_Error(
+                        'theme_wp_incompatible',
+                        sprintf(
+                                /* translators: %s: Theme name. */
+                                __( '<strong>Error:</strong> Current WordPress version does not meet minimum requirements for %s.' ),
+                                $theme_data['Name']
+                        )
+                );
+        }
+
+        return $response;
+}
+
 /**
  * Retrieve all theme modifications.
  *