Ticket #39677: 39677.4.diff

src/wp-admin/network/settings.php

@@ -63 +63 @@
         );
 
         // Handle translation install.
-        if ( ! empty( $_POST['WPLANG'] ) && wp_can_install_language_pack() ) {  // @todo: Skip if already installed
+        if ( ! empty( $_POST['WPLANG'] ) && current_user_can( 'install_languages' ) ) {
                 $language = wp_download_language_pack( $_POST['WPLANG'] );
                 if ( $language ) {
                         $_POST['WPLANG'] = $language;
@@ -342 +342 @@
                                                         'selected'     => $lang,
                                                         'languages'    => $languages,
                                                         'translations' => $translations,
-                                                        'show_available_translations' => wp_can_install_language_pack(),
+                                                        'show_available_translations' => current_user_can( 'install_languages' ),
                                                 ) );
                                                 ?>
                                         </td>

src/wp-admin/network/site-new.php

@@ -66 +66 @@
         if ( isset( $_POST['WPLANG'] ) ) {
                 if ( '' === $_POST['WPLANG'] ) {
                         $meta['WPLANG'] = ''; // en_US
-                } elseif ( wp_can_install_language_pack() ) {
+                } elseif ( in_array( $_POST['WPLANG'], get_available_languages() ) ) {
+                        $meta['WPLANG'] = $_POST['WPLANG'];
+                } elseif ( current_user_can( 'install_languages' ) ) {
                         $language = wp_download_language_pack( wp_unslash( $_POST['WPLANG'] ) );
                         if ( $language ) {
                                 $meta['WPLANG'] = $language;
@@ -234 +236 @@
                                                 'selected'                    => $lang,
                                                 'languages'                   => $languages,
                                                 'translations'                => $translations,
-                                                'show_available_translations' => wp_can_install_language_pack(),
+                                                'show_available_translations' => current_user_can( 'install_languages' ),
                                         ) );
                                         ?>
                                 </td>

src/wp-admin/options-general.php

@@ -144 +144 @@
                                 'selected'     => $locale,
                                 'languages'    => $languages,
                                 'translations' => $translations,
-                                'show_available_translations' => ( ! is_multisite() || is_super_admin() ) && wp_can_install_language_pack(),
+                                'show_available_translations' => current_user_can( 'install_languages' ),
                         ) );
 
                         // Add note about deprecated WPLANG constant.

src/wp-admin/options.php

@@ -182 +182 @@
                 }
 
                 // Handle translation install.
-                if ( ! empty( $_POST['WPLANG'] ) && ( ! is_multisite() || is_super_admin() ) ) { // @todo: Skip if already installed
+                if ( ! empty( $_POST['WPLANG'] ) && current_user_can( 'install_languages' ) ) {
                         require_once( ABSPATH . 'wp-admin/includes/translation-install.php' );
 
-                        if ( wp_can_install_language_pack() ) {
-                                $language = wp_download_language_pack( $_POST['WPLANG'] );
-                                if ( $language ) {
-                                        $_POST['WPLANG'] = $language;
-                                }
+                        $language = wp_download_language_pack( $_POST['WPLANG'] );
+                        if ( $language ) {
+                                $_POST['WPLANG'] = $language;
                         }
                 }
         }

src/wp-admin/update-core.php

@@ -608 +608 @@
         echo ' &nbsp; <a class="button" href="' . esc_url( self_admin_url('update-core.php?force-check=1') ) . '">' . __( 'Check Again' ) . '</a>';
         echo '</p>';
 
-        if ( $core = current_user_can( 'update_core' ) )
+        if ( current_user_can( 'update_core' ) ) {
                 core_upgrade_preamble();
-        if ( $plugins = current_user_can( 'update_plugins' ) )
+        }
+        if ( current_user_can( 'update_plugins' ) ) {
                 list_plugin_updates();
-        if ( $themes = current_user_can( 'update_themes' ) )
+        }
+        if ( current_user_can( 'update_themes' ) ) {
                 list_theme_updates();
-        if ( $core || $plugins || $themes )
+        }
+        if ( current_user_can( 'update_languages' ) ) {
                 list_translation_updates();
-        unset( $core, $plugins, $themes );
+        }
+
         /**
          * Fires after the core, plugin, and theme update tables.
          *
@@ -729 +733 @@
 
 } elseif ( 'do-translation-upgrade' == $action ) {
 
-        if ( ! current_user_can( 'update_core' ) && ! current_user_can( 'update_plugins' ) && ! current_user_can( 'update_themes' ) )
+        if ( ! current_user_can( 'update_languages' ) )
                 wp_die( __( 'Sorry, you are not allowed to update this site.' ) );
 
         check_admin_referer( 'upgrade-translations' );

src/wp-includes/capabilities.php

@@ -392 +392 @@
                         $caps[] = $cap;
                 }
                 break;
+        case 'install_languages':
+        case 'update_languages':
+                if ( ! function_exists( 'wp_can_install_language_pack' ) ) {
+                        require_once( ABSPATH . 'wp-admin/includes/translation-install.php' );
+                }
+
+                if ( ! wp_can_install_language_pack() ) {
+                        $caps[] = 'do_not_allow';
+                } elseif ( is_multisite() && ! is_super_admin( $user_id ) ) {
+                        $caps[] = 'do_not_allow';
+                } else {
+                        $caps[] = 'install_languages';
+                }
+                break;
         case 'activate_plugins':
                 $caps[] = $cap;
                 if ( is_multisite() ) {
@@ -826 +840 @@
         }
         return false;
 }
+
+/**
+ * Filters the user capabilities to grant the 'install_languages' capability as necessary.
+ *
+ * A user must have at least one out of the 'update_core', 'install_plugins', and
+ * 'install_themes' capabilities to qualify for 'install_languages'.
+ *
+ * @since 4.9.0
+ *
+ * @param array $allcaps An array of all the user's capabilities.
+ * @return array Filtered array of the user's capabilities.
+ */
+function wp_maybe_grant_install_languages_cap( $allcaps ) {
+        if ( ! empty( $allcaps['update_core'] ) || ! empty( $allcaps['install_plugins'] ) || ! empty( $allcaps['install_themes'] ) ) {
+                $allcaps['install_languages'] = true;
+        }
+
+        return $allcaps;
+}

src/wp-includes/default-filters.php

@@ -511 +511 @@
 add_filter( 'oembed_response_data',   'get_oembed_response_data_rich',  10, 4 );
 add_filter( 'pre_oembed_result',      'wp_filter_pre_oembed_result',    10, 3 );
 
+// Capabilities
+add_filter( 'user_has_cap', 'wp_maybe_grant_install_languages_cap', 1 );
+
 unset( $filter, $action );

tests/phpunit/tests/user/capabilities.php

@@ -233 +233 @@
                         'upload_themes'          => array( 'administrator' ),
                         'customize'              => array( 'administrator' ),
                         'add_users'              => array( 'administrator' ),
+                        'install_languages'      => array( 'administrator' ),
+                        'update_languages'       => array( 'administrator' ),
 
                         'edit_categories'        => array( 'administrator', 'editor' ),
                         'delete_categories'      => array( 'administrator', 'editor' ),
@@ -261 +263 @@
                         'upload_themes'          => array(),
                         'edit_css'               => array(),
                         'upgrade_network'        => array(),
+                        'install_languages'      => array(),
+                        'update_languages'       => array(),
 
                         'customize'              => array( 'administrator' ),
                         'delete_site'            => array( 'administrator' ),