Add custom header with grafana user and a config switch for it

pkg/api/pluginproxy/pluginproxy_test.go

@@ -1,6 +1,7 @@
 package pluginproxy
 
 import (
+	"net/http"
 	"testing"
 
 	"github.com/grafana/grafana/pkg/bus"
@@ -44,4 +45,45 @@ func TestPluginProxy(t *testing.T) {
 		})
 	})
 
+	Convey("When SendUserHeader config is enabled", t, func() {
+		req := getPluginProxiedRequest(
+			&m.ReqContext{
+				SignedInUser: &m.SignedInUser{
+					Login: "test_user",
+				},
+			},
+			&setting.Cfg{SendUserHeader: true},
+		)
+
+		Convey("Should add header with username", func() {
+			// Get will return empty string even if header is not set
+			So(req.Header.Get("X-Grafana-User"), ShouldEqual, "test_user")
+		})
+	})
+
+	Convey("When SendUserHeader config is disabled", t, func() {
+		req := getPluginProxiedRequest(
+			&m.ReqContext{
+				SignedInUser: &m.SignedInUser{
+					Login: "test_user",
+				},
+			},
+			&setting.Cfg{SendUserHeader: false},
+		)
+		Convey("Should not add header with username", func() {
+			// Get will return empty string even if header is not set
+			So(req.Header.Get("X-Grafana-User"), ShouldEqual, "")
+		})
+	})
+}
+
+// getPluginProxiedRequest is a helper for easier setup of tests based on global config and ReqContext.
+func getPluginProxiedRequest(ctx *m.ReqContext, cfg *setting.Cfg) *http.Request {
+	route := &plugins.AppPluginRoute{}
+	proxy := NewApiPluginProxy(ctx, "", route, "", cfg)
+
+	req, err := http.NewRequest(http.MethodGet, "http://grafana.com/sub", nil)
+	So(err, ShouldBeNil)
+	proxy.Director(req)
+	return req
 }