AJAX-friendly technique for detecting "current" group on BP 12+.

See #748.

includes/addon-folders.php

@@ -223,7 +223,8 @@ function bp_docs_enable_folders() {
  */
 function bp_docs_enable_folders_for_current_context() {
 	// Enabled only in groups by default. Enable elsewhere only at your own risk.
-	$enable = function_exists( 'bp_is_group' ) && bp_is_group();
+	$enable = (bool) bp_docs_get_current_group_id();
+
 	return apply_filters( 'bp_docs_enable_folders_for_current_context', (bool) $enable );
 }
 
@@ -750,8 +751,11 @@ function bp_docs_delete_folder_contents( $folder_id ) {
  */
 function bp_docs_get_folders( $args = array() ) {
 	$group_id = null;
-	if ( bp_is_active( 'groups' ) && bp_is_group() ) {
+	if ( bp_is_active( 'groups' ) ) {
 		$group_id = bp_get_current_group_id();
+		if ( ! $group_id && defined( 'DOING_AJAX' ) && DOING_AJAX ) {
+			$group_id = bp_get_group_id( bp_docs_get_current_group_id() );
+		}
 	}
 
 	$user_id = null;

includes/integration-groups.php

@@ -2028,3 +2028,52 @@ function bp_docs_groups_map_meta_caps( $caps, $cap, $user_id, $args ) {
 	return $caps;
 }
 add_filter( 'bp_docs_map_meta_caps', 'bp_docs_groups_map_meta_caps', 10, 4 );
+
+/**
+ * AJAX-friendly function to get the ID of the current group.
+ *
+ * @since 2.2.3
+ *
+ * @return bool
+ */
+function bp_docs_get_current_group_id() {
+	if ( ! function_exists( 'bp_get_current_group_id' ) ) {
+		return false;
+	}
+
+	$group_id = bp_get_current_group_id();
+
+	if ( ! $group_id && defined( 'DOING_AJAX' ) && DOING_AJAX && isset( buddypress()->groups->rewrite_ids['single_item'] ) ) {
+
+		// Identify single-group rewrite rules.
+		$group_rewrite_rules = [];
+		$all_rewrite_rules   = $GLOBALS['wp_rewrite']->wp_rewrite_rules();
+		$group_rewrite_id    = buddypress()->groups->rewrite_ids['single_item'];
+		foreach ( $all_rewrite_rules as $regex => $query ) {
+			$query_string = parse_url( $query, PHP_URL_QUERY );
+			if ( $query_string ) {
+				parse_str( $query_string, $query_args );
+				if ( $query_args && isset( $query_args[ $group_rewrite_id ] ) ) {
+					$group_rewrite_rules[ $regex ] = $query_args;
+				}
+			}
+		}
+
+		$referer = wp_get_referer();
+
+		// Figure out the requested group based on the referer.
+		foreach ( $group_rewrite_rules as $regex => $query_args ) {
+			if ( preg_match( '|' . $regex . '|', $referer, $matches ) ) {
+				$group_query_arg = $query_args[ $group_rewrite_id ];
+				if ( preg_match( '/\[(\d+)\]/', $group_query_arg, $id_matches ) ) {
+					$match_id   = (int) $id_matches[1];
+					$group_slug = $matches[ $match_id ];
+					$group_id   = groups_get_id( $group_slug );
+					break;
+				}
+			}
+		}
+	}
+
+	return $group_id;
+}