[9.3.x] Backport Contexthandler: Add uname as response header #59930 (#59951)

Contexthandler: Add uname as response header (#59930)

Signed-off-by: bergquist <carl.bergquist@gmail.com>
(cherry picked from commit 1b676d0d49)

packages/grafana-data/src/types/featureToggles.gen.ts

@@ -16,6 +16,7 @@
 export interface FeatureToggles {
   [name: string]: boolean | undefined; // support any string value
 
+  returnUnameHeader?: boolean;
   alertingBigTransactions?: boolean;
   promQueryBuilder?: boolean;
   trimDefaults?: boolean;

pkg/services/contexthandler/contexthandler.go

@@ -188,6 +188,11 @@ func (h *ContextHandler) Middleware(next http.Handler) http.Handler {
 			}
 		}
 
+		// this can be used by proxies to identify certain users
+		if h.features.IsEnabled(featuremgmt.FlagReturnUnameHeader) {
+			w.Header().Add("grafana-uname", reqContext.Login)
+		}
+
 		next.ServeHTTP(w, r)
 	})
 }

pkg/services/featuremgmt/registry.go

@@ -9,6 +9,11 @@ package featuremgmt
 var (
 	// Register each toggle here
 	standardFeatureFlags = []FeatureFlag{
+		{
+			Name:        "returnUnameHeader",
+			Description: "Return user login as header for authenticated requests",
+			State:       FeatureStateAlpha,
+		},
 		{
 			Name:        "alertingBigTransactions",
 			Description: "Use big transactions for alerting database writes",

pkg/services/featuremgmt/toggles_gen.go

@@ -7,6 +7,10 @@
 package featuremgmt
 
 const (
+	// FlagReturnUnameHeader
+	// Return user login as header for authenticated requests
+	FlagReturnUnameHeader = "returnUnameHeader"
+
 	// FlagAlertingBigTransactions
 	// Use big transactions for alerting database writes
 	FlagAlertingBigTransactions = "alertingBigTransactions"