add audit/admin trace support for browser requests (#10947)

To support this functionality we had to fork
the gorilla/rpc package with relevant changes

cmd/web-router.go

@@ -23,9 +23,10 @@ import (
 	assetfs "github.com/elazarl/go-bindata-assetfs"
 	"github.com/gorilla/handlers"
 	"github.com/gorilla/mux"
-	jsonrpc "github.com/gorilla/rpc/v2"
-	"github.com/gorilla/rpc/v2/json2"
 	"github.com/minio/minio/browser"
+	"github.com/minio/minio/cmd/logger"
+	jsonrpc "github.com/minio/minio/pkg/rpc"
+	"github.com/minio/minio/pkg/rpc/json2"
 )
 
 // webAPI container for Web API.
@@ -76,9 +77,23 @@ func registerWebRouter(router *mux.Router) error {
 	webRPC := jsonrpc.NewServer()
 	webRPC.RegisterCodec(codec, "application/json")
 	webRPC.RegisterCodec(codec, "application/json; charset=UTF-8")
+	webRPC.RegisterAfterFunc(func(ri *jsonrpc.RequestInfo) {
+		if ri != nil {
+			claims, _, _ := webRequestAuthenticate(ri.Request)
+			bucketName, objectName := extractBucketObject(ri.Args)
+			ri.Request = mux.SetURLVars(ri.Request, map[string]string{
+				"bucket": bucketName,
+				"object": objectName,
+			})
+			if globalHTTPTrace.HasSubscribers() {
+				globalHTTPTrace.Publish(WebTrace(ri))
+			}
+			logger.AuditLog(ri.ResponseWriter, ri.Request, ri.Method, claims.Map())
+		}
+	})
 
 	// Register RPC handlers with server
-	if err := webRPC.RegisterService(web, "Web"); err != nil {
+	if err := webRPC.RegisterService(web, "web"); err != nil {
 		return err
 	}