Make sure runner-admin has both auth_url and auth_url_v2. (#4066)

Author: TingluoHuang

src/Runner.Listener/Configuration/ConfigurationManager.cs

@@ -284,13 +284,21 @@ public async Task ConfigureAsync(CommandSettings command)
                             {
                                 var runner = await _dotcomServer.ReplaceRunnerAsync(runnerSettings.PoolId, agent, runnerSettings.GitHubUrl, registerToken, publicKeyXML);
                                 runnerSettings.ServerUrlV2 = runner.RunnerAuthorization.ServerUrl;
+                                runnerSettings.UseV2Flow = true; // if we are using runner admin, we also need to hit broker
 
                                 agent.Id = runner.Id;
                                 agent.Authorization = new TaskAgentAuthorization()
                                 {
                                     AuthorizationUrl = runner.RunnerAuthorization.AuthorizationUrl,
                                     ClientId = new Guid(runner.RunnerAuthorization.ClientId)
                                 };
+
+                                if (!string.IsNullOrEmpty(runner.RunnerAuthorization.LegacyAuthorizationUrl?.AbsoluteUri))
+                                {
+                                    agent.Authorization.AuthorizationUrl = runner.RunnerAuthorization.LegacyAuthorizationUrl;
+                                    agent.Properties["EnableAuthMigrationByDefault"] = true;
+                                    agent.Properties["AuthorizationUrlV2"] = runner.RunnerAuthorization.AuthorizationUrl.AbsoluteUri;
+                                }
                             }
                             else
                             {
@@ -342,6 +350,13 @@ public async Task ConfigureAsync(CommandSettings command)
                                 AuthorizationUrl = runner.RunnerAuthorization.AuthorizationUrl,
                                 ClientId = new Guid(runner.RunnerAuthorization.ClientId)
                             };
+
+                            if (!string.IsNullOrEmpty(runner.RunnerAuthorization.LegacyAuthorizationUrl?.AbsoluteUri))
+                            {
+                                agent.Authorization.AuthorizationUrl = runner.RunnerAuthorization.LegacyAuthorizationUrl;
+                                agent.Properties["EnableAuthMigrationByDefault"] = true;
+                                agent.Properties["AuthorizationUrlV2"] = runner.RunnerAuthorization.AuthorizationUrl.AbsoluteUri;
+                            }
                         }
                         else
                         {

src/Sdk/DTWebApi/WebApi/Runner.cs

@@ -18,6 +18,16 @@ public Uri AuthorizationUrl
                 internal set;
             }
 
+            /// <summary>
+            /// The url to refresh tokens with legacy service
+            /// </summary> 
+            [JsonProperty("legacy_authorization_url")]
+            public Uri LegacyAuthorizationUrl
+            {
+                get;
+                internal set;
+            }
+
             /// <summary>
             /// The url to connect to poll for messages
             /// </summary>