AuthN: Rebuild Authenticate so we only have to call it once in context handler (#61705)

* API: Add reqSignedIn to router groups

* AuthN: Add fall through in context handler

* AuthN: Add IsAnonymous field

* AuthN: add priority to context aware clients

* ContextHandler: Add comment

* AuthN: Add a simple priority queue

* AuthN: Add Name to client interface

* AuthN: register clients with function

* AuthN: update mock and fake to implement interface

* AuthN: rewrite test without reflection

* AuthN: add comment

* AuthN: fix queue insert

* AuthN: rewrite tests

* AuthN: make the queue generic so we can reuse it for hooks

* ContextHandler: Add fixme for auth headers

* AuthN: remove unused variable

* AuthN: use multierror

* AuthN: write proper tests for queue

* AuthN: Add queue item that can store the value and priority

Co-authored-by: Jo <joao.guerreiro@grafana.com>

pkg/middleware/auth.go

@@ -2,6 +2,7 @@ package middleware
 
 import (
 	"errors"
+	"net/http"
 	"net/url"
 	"regexp"
 	"strconv"
@@ -37,7 +38,7 @@ func accessForbidden(c *models.ReqContext) {
 
 func notAuthorized(c *models.ReqContext) {
 	if c.IsApiRequest() {
-		c.JsonApiErr(401, "Unauthorized", nil)
+		c.WriteErrOrFallback(http.StatusUnauthorized, http.StatusText(http.StatusUnauthorized), c.LookupTokenErr)
 		return
 	}