[grid] Provide a method to just get the session uri from a session map

java/server/src/org/openqa/selenium/grid/sessionmap/GetSessionUri.java

@@ -0,0 +1,43 @@
+// Licensed to the Software Freedom Conservancy (SFC) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The SFC licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+package org.openqa.selenium.grid.sessionmap;
+
+import org.openqa.selenium.remote.SessionId;
+import org.openqa.selenium.remote.http.Contents;
+import org.openqa.selenium.remote.http.HttpHandler;
+import org.openqa.selenium.remote.http.HttpRequest;
+import org.openqa.selenium.remote.http.HttpResponse;
+
+import java.io.UncheckedIOException;
+import java.util.Objects;
+
+class GetSessionUri implements HttpHandler {
+  private final SessionMap sessionMap;
+  private final SessionId sessionId;
+
+  public GetSessionUri(SessionMap sessionMap, SessionId sessionId) {
+    this.sessionMap = Objects.requireNonNull(sessionMap);
+    this.sessionId = Objects.requireNonNull(sessionId);
+  }
+
+  @Override
+  public HttpResponse execute(HttpRequest req) throws UncheckedIOException {
+    return new HttpResponse()
+      .setContent(Contents.asJson(sessionMap.getUri(sessionId)));
+  }
+}

java/server/src/org/openqa/selenium/grid/sessionmap/SessionMap.java

@@ -79,11 +79,17 @@ public abstract class SessionMap implements Routable, HttpHandler {
 
   public abstract void remove(SessionId id);
 
+  public URI getUri(SessionId id) throws NoSuchSessionException {
+    return get(id).getUri();
+  }
+
   public SessionMap(Tracer tracer) {
     this.tracer = Objects.requireNonNull(tracer);
 
     Json json = new Json();
     routes = combine(
+        Route.get("/se/grid/session/{sessionId}/uri")
+            .to(params -> new GetSessionUri(this, new SessionId(params.get("sessionId")))),
         post("/se/grid/session").to(() -> new AddToSessionMap(tracer, json, this)),
         Route.get("/se/grid/session/{sessionId}")
             .to(params -> new GetFromSessionMap(tracer, json, this, new SessionId(params.get("sessionId")))),