Add support for negotiateVersion query string parameter

src/SignalR/clients/java/signalr/src/main/java/com/microsoft/signalr/HubConnection.java

@@ -57,6 +57,8 @@ public class HubConnection {
     private Map<String, Observable> streamMap = new ConcurrentHashMap<>();
     private TransportEnum transportEnum = TransportEnum.ALL;
     private String connectionId;
+    private String connectionToken;
+    private final int negotiateVersion = 1;
     private final Logger logger = LoggerFactory.getLogger(HubConnection.class);
 
     /**
@@ -340,11 +342,12 @@ public Completable start() {
         });
 
         stopError = null;
+        String urlWithQS = Utils.appendQueryString(baseUrl, "negotiateVersion=" + negotiateVersion);
         Single<NegotiateResponse> negotiate = null;
         if (!skipNegotiate) {
-            negotiate = tokenCompletable.andThen(Single.defer(() -> startNegotiate(baseUrl, 0)));
+            negotiate = tokenCompletable.andThen(Single.defer(() -> startNegotiate(urlWithQS, 0)));
         } else {
-            negotiate = tokenCompletable.andThen(Single.defer(() -> Single.just(new NegotiateResponse(baseUrl))));
+            negotiate = tokenCompletable.andThen(Single.defer(() -> Single.just(new NegotiateResponse(urlWithQS))));
         }
 
         CompletableSubject start = CompletableSubject.create();
@@ -377,7 +380,6 @@ public Completable start() {
                         hubConnectionStateLock.lock();
                         try {
                             hubConnectionState = HubConnectionState.CONNECTED;
-                            this.connectionId = negotiateResponse.getConnectionId();
                             logger.info("HubConnection started.");
                             resetServerTimeout();
                             //Don't send pings if we're using long polling.
@@ -447,19 +449,21 @@ private Single<NegotiateResponse> startNegotiate(String url, int negotiateAttemp
                     throw new RuntimeException("There were no compatible transports on the server.");
                 }
 
-                String finalUrl = url;
-                if (response.getConnectionId() != null) {
-                    if (url.contains("?")) {
-                        finalUrl = url + "&id=" + response.getConnectionId();
-                    } else {
-                        finalUrl = url + "?id=" + response.getConnectionId();
-                    }
+                if (response.getVersion() > 0) {
+                    this.connectionId = response.getConnectionId();
+                    this.connectionToken = response.getConnectionToken();
+                } else {
+                    this.connectionToken = this.connectionId = response.getConnectionId();
                 }
+
+                String finalUrl = Utils.appendQueryString(url, "id=" + this.connectionToken);
+
                 response.setFinalUrl(finalUrl);
                 return Single.just(response);
             }
 
-            return startNegotiate(response.getRedirectUrl(), negotiateAttempts + 1);
+            String redirectUrl = Utils.appendQueryString(response.getRedirectUrl(), "negotiateVersion=" + negotiateVersion);
+            return startNegotiate(redirectUrl, negotiateAttempts + 1);
         });
     }
 
@@ -521,6 +525,7 @@ private void stopConnection(String errorMessage) {
             handshakeResponseSubject.onComplete();
             redirectAccessTokenProvider = null;
             connectionId = null;
+            connectionToken = null;
             transportEnum = TransportEnum.ALL;
             this.localHeaders.clear();
             this.streamMap.clear();

src/SignalR/clients/java/signalr/src/main/java/com/microsoft/signalr/Negotiate.java

@@ -10,7 +10,7 @@ public static String resolveNegotiateUrl(String url) {
         // Check if we have a query string. If we do then we ignore it for now.
         int queryStringIndex = url.indexOf('?');
         if (queryStringIndex > 0) {
-            negotiateUrl = url.substring(0, url.indexOf('?'));
+            negotiateUrl = url.substring(0, queryStringIndex);
         } else {
             negotiateUrl = url;
         }
@@ -24,7 +24,7 @@ public static String resolveNegotiateUrl(String url) {
 
         // Add the query string back if it existed.
         if (queryStringIndex > 0) {
-            negotiateUrl += url.substring(url.indexOf('?'));
+            negotiateUrl += url.substring(queryStringIndex);
         }
 
         return negotiateUrl;

src/SignalR/clients/java/signalr/src/main/java/com/microsoft/signalr/NegotiateResponse.java

@@ -11,11 +11,13 @@
 
 class NegotiateResponse {
     private String connectionId;
+    private String connectionToken;
     private Set<String> availableTransports = new HashSet<>();
     private String redirectUrl;
     private String accessToken;
     private String error;
     private String finalUrl;
+    private int version;
 
     public NegotiateResponse(JsonReader reader) {
         try {
@@ -30,6 +32,12 @@ public NegotiateResponse(JsonReader reader) {
                     case "ProtocolVersion":
                         this.error = "Detected an ASP.NET SignalR Server. This client only supports connecting to an ASP.NET Core SignalR Server. See https://aka.ms/signalr-core-differences for details.";
                         return;
+                    case "negotiateVersion":
+                        this.version = reader.nextInt();
+                        break;
+                    case "connectionToken":
+                        this.connectionToken = reader.nextString();
+                        break;
                     case "url":
                         this.redirectUrl = reader.nextString();
                         break;
@@ -106,6 +114,14 @@ public String getFinalUrl() {
         return finalUrl;
     }
 
+    public int getVersion() {
+        return version;
+    }
+
+    public String getConnectionToken() {
+        return connectionToken;
+    }
+
     public void setFinalUrl(String url) {
         this.finalUrl = url;
     }

src/SignalR/clients/java/signalr/src/main/java/com/microsoft/signalr/Utils.java

@@ -0,0 +1,14 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+package com.microsoft.signalr;
+
+class Utils {
+    public static String appendQueryString(String original, String queryStringValue) {
+        if (original.contains("?")) {
+            return original + "&" + queryStringValue;
+        } else {
+            return  original + "?" + queryStringValue;
+        }
+    }
+}

src/SignalR/clients/java/signalr/src/main/java/com/microsoft/signalr/Version.java

@@ -1,4 +1,3 @@
-
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.