fix viewer redirects (ydb-platform#7103) (ydb-platform#7120)

Author: adameat

ydb/core/mon/async_http_mon.cpp

@@ -551,9 +551,36 @@ class THttpMonServiceNodeRequest : public TActorBootstrapped<THttpMonServiceNode
         }
     }
 
+    TString RewriteLocationWithNode(const TString& response) {
+        NHttp::THttpParser<NHttp::THttpResponse, NHttp::TSocketBuffer> parser(response);
+
+        NHttp::THeadersBuilder headers(parser.Headers);
+        headers.Set("Location", TStringBuilder() << "/node/" << TActivationContext::ActorSystem()->NodeId << headers["Location"]);
+
+        NHttp::THttpRenderer<NHttp::THttpResponse, NHttp::TSocketBuffer> renderer;
+        renderer.InitResponse(parser.Protocol, parser.Version, parser.Status, parser.Message);
+        renderer.Set(headers);
+        if (parser.HaveBody()) {
+            renderer.SetBody(parser.Body); // it shouldn't be here, 30x with a body is a bad idea
+        }
+        renderer.Finish();
+        return renderer.AsString();
+    }
+
     void Handle(NHttp::TEvHttpProxy::TEvHttpOutgoingResponse::TPtr& ev) {
+        TString httpResponse = ev->Get()->Response->AsString();
+        switch (FromStringWithDefault<int>(ev->Get()->Response->Status)) {
+            case 301:
+            case 303:
+            case 307:
+            case 308:
+                if (!NHttp::THeaders(ev->Get()->Response->Headers).Get("Location").starts_with("/node/")) {
+                    httpResponse = RewriteLocationWithNode(httpResponse);
+                }
+                break;
+        }
         auto response = std::make_unique<TEvMon::TEvMonitoringResponse>();
-        response->Record.SetHttpResponse(ev->Get()->Response->AsString());
+        response->Record.SetHttpResponse(httpResponse);
         Send(Event->Sender, response.release(), 0, Event->Cookie);
         PassAway();
     }

ydb/core/viewer/viewer.cpp

@@ -188,15 +188,15 @@ class TViewer : public TActorBootstrapped<TViewer>, public IViewer {
                 JsonHandlers.JsonHandlersIndex[oldPath] = JsonHandlers.JsonHandlersIndex[newPath];
             }
 
-            // TODO: redirect old paths
-            Redirect307["/viewer/v2/json/config"] = "/viewer/config";
-            Redirect307["/viewer/v2/json/sysinfo"] = "/viewer/sysinfo";
-            Redirect307["/viewer/v2/json/pdiskinfo"] = "/viewer/pdiskinfo";
-            Redirect307["/viewer/v2/json/vdiskinfo"] = "/viewer/vdiskinfo";
-            Redirect307["/viewer/v2/json/storage"] = "/viewer/storage";
-            Redirect307["/viewer/v2/json/nodelist"] = "/viewer/nodelist";
-            Redirect307["/viewer/v2/json/tabletinfo"] = "/viewer/tabletinfo";
-            Redirect307["/viewer/v2/json/nodeinfo"] = "/viewer/nodeinfo";
+            // TODO: redirect of very old paths
+            JsonHandlers.JsonHandlersIndex["/viewer/v2/json/config"] = JsonHandlers.JsonHandlersIndex["/viewer/config"];
+            JsonHandlers.JsonHandlersIndex["/viewer/v2/json/sysinfo"] = JsonHandlers.JsonHandlersIndex["/viewer/sysinfo"];
+            JsonHandlers.JsonHandlersIndex["/viewer/v2/json/pdiskinfo"] = JsonHandlers.JsonHandlersIndex["/viewer/pdiskinfo"];
+            JsonHandlers.JsonHandlersIndex["/viewer/v2/json/vdiskinfo"] = JsonHandlers.JsonHandlersIndex["/viewer/vdiskinfo"];
+            JsonHandlers.JsonHandlersIndex["/viewer/v2/json/storage"] = JsonHandlers.JsonHandlersIndex["/viewer/storage"];
+            JsonHandlers.JsonHandlersIndex["/viewer/v2/json/nodelist"] = JsonHandlers.JsonHandlersIndex["/viewer/nodelist"];
+            JsonHandlers.JsonHandlersIndex["/viewer/v2/json/tabletinfo"] = JsonHandlers.JsonHandlersIndex["/viewer/tabletinfo"];
+            JsonHandlers.JsonHandlersIndex["/viewer/v2/json/nodeinfo"] = JsonHandlers.JsonHandlersIndex["/viewer/nodeinfo"];
 
             TWhiteboardInfo<NKikimrWhiteboard::TEvNodeStateResponse>::InitMerger();
             TWhiteboardInfo<NKikimrWhiteboard::TEvBSGroupStateResponse>::InitMerger();