Android interactive login flow

AutoRest/Generators/Java/Java/Templates/ServiceClientInterfaceTemplate.cshtml

@@ -114,7 +114,7 @@ if(!property.IsReadOnly)
     @: * @@param @param.Name @((param.Documentation ?? "the " + param.Type.ToString() + " value").EscapeXmlComment())
     }
 
-    @foreach (var exception in method.ExceptionStatements)
+    foreach (var exception in method.ExceptionStatements)
     {
     @: * @@throws @exception
     }

ClientRuntimes/Java/azure-android-client-authentication/src/main/java/com/microsoft/rest/credentials/UserTokenCredentials.java

@@ -12,6 +12,7 @@
 import com.microsoft.aad.adal.AuthenticationCallback;
 import com.microsoft.aad.adal.AuthenticationContext;
 import com.microsoft.aad.adal.AuthenticationResult;
+import com.microsoft.aad.adal.DefaultTokenCacheStore;
 import com.microsoft.aad.adal.PromptBehavior;
 
 import java.io.IOException;
@@ -36,27 +37,66 @@ public class UserTokenCredentials extends TokenCredentials {
     private Activity activity;
     /** The count down latch to synchronize token acquisition. */
     private CountDownLatch signal = new CountDownLatch(1);
+    /** The static token cache. */
+    private static DefaultTokenCacheStore tokenCacheStore;
+    /** The behavior of when to prompt a login. */
+    private PromptBehavior promptBehavior;
 
     /**
      * Initializes a new instance of the UserTokenCredentials.
      *
+     * @param activity The caller activity.
      * @param clientId the active directory application client id.
      * @param domain the domain or tenant id containing this application.
      * @param clientRedirectUri the Uri where the user will be redirected after authenticating with AD.
+     */
+    public UserTokenCredentials(
+            Activity activity,
+            String clientId,
+            String domain,
+            String clientRedirectUri) {
+        this(activity, clientId, domain, clientRedirectUri, PromptBehavior.Auto, AzureEnvironment.AZURE);
+    }
+
+    /**
+     * Initializes a new instance of the UserTokenCredentials.
+     *
+     * @param activity The caller activity.
+     * @param clientId the active directory application client id.
+     * @param domain the domain or tenant id containing this application.
+     * @param clientRedirectUri the Uri where the user will be redirected after authenticating with AD.
+     * @param promptBehavior the behavior of when to prompt a login.
      * @param environment the Azure environment to authenticate with.
      *                    If null is provided, AzureEnvironment.AZURE will be used.
      */
-    public UserTokenCredentials(Activity activity, String clientId, String domain, String clientRedirectUri, AzureEnvironment environment) {
+    public UserTokenCredentials(
+            Activity activity,
+            String clientId,
+            String domain,
+            String clientRedirectUri,
+            PromptBehavior promptBehavior,
+            AzureEnvironment environment) {
         super(null, null); // defer token acquisition
         this.clientId = clientId;
         this.domain = domain;
         this.clientRedirectUri = clientRedirectUri;
-        if (environment == null) {
-            this.environment = AzureEnvironment.AZURE;
-        } else {
-            this.environment = environment;
-        }
         this.activity = activity;
+        this.promptBehavior = promptBehavior;
+        this.environment = environment;
+        if (tokenCacheStore == null) {
+            try {
+                tokenCacheStore = new DefaultTokenCacheStore(activity);
+            } catch (NoSuchAlgorithmException | NoSuchPaddingException e) {
+                tokenCacheStore = null;
+            }
+        }
+    }
+
+    /**
+     * Clear the items stored in token cache.
+     */
+    public static void clearTokenCache() {
+        tokenCacheStore.removeAll();
     }
 
     /**
@@ -69,14 +109,23 @@ public String getClientId() {
     }
 
     /**
-     * Gets the tenant or domain the containing the application.
+     * Gets the tenant or domain containing the application.
      *
-     * @return the tenant or domain the containing the application.
+     * @return the tenant or domain containing the application.
      */
     public String getDomain() {
         return domain;
     }
 
+    /**
+     * Sets the tenant of domain containing the application.
+     *
+     * @param domain the tenant or domain containing the application.
+     */
+    public void setDomain(String domain) {
+        this.domain = domain;
+    }
+
     /**
      * Gets the Uri where the user will be redirected after authenticating with AD.
      *
@@ -97,9 +146,7 @@ public AzureEnvironment getEnvironment() {
 
     @Override
     public String getToken() throws IOException {
-        if (token == null) {
-            acquireAccessToken();
-        }
+        refreshToken();
         return token;
     }
 
@@ -109,20 +156,15 @@ public void refreshToken() throws IOException {
     }
 
     private void acquireAccessToken() throws IOException {
-        String authorityUrl = this.getEnvironment().getAuthenticationEndpoint() + this.getDomain();
-        AuthenticationContext context;
-        try {
-            context = new AuthenticationContext(activity, authorityUrl, true);
-        } catch (NoSuchAlgorithmException | NoSuchPaddingException e) {
-            return;
-        }
-        final TokenCredentials self = this;
+        final String authorityUrl = this.getEnvironment().getAuthenticationEndpoint() + this.getDomain();
+        AuthenticationContext context = new AuthenticationContext(activity, authorityUrl, true, tokenCacheStore);
+        final UserTokenCredentials self = this;
         context.acquireToken(
                 this.getEnvironment().getTokenAudience(),
                 this.getClientId(),
                 this.getClientRedirectUri(),
                 null,
-                PromptBehavior.Always,
+                promptBehavior,
                 null,
                 new AuthenticationCallback<AuthenticationResult>() {
                     @Override