Snippets for new Admin auth features

.gitignore

@@ -8,3 +8,7 @@ build/
 *.ear
 *.aar
 *.iml
+
+.project
+.settings
+.classpath

admin/src/main/java/com/google/firebase/example/FirebaseAuthSnippets.java

@@ -0,0 +1,64 @@
+/*
+ * Copyright 2020 Google Inc. All Rights Reserved.
+ *
+ * Licensed 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 com.google.firebase.example;
+
+import java.util.List;
+import java.util.ArrayList;
+
+import com.google.firebase.auth.FirebaseAuth;
+import com.google.firebase.auth.UserProvider;
+import com.google.firebase.auth.UserRecord;
+
+public class FirebaseAuthSnippets {
+
+  public void getUserByFederatedId() throws Exception {
+    // [START get_user_by_federated_id]
+    UserRecord user = FirebaseAuth.getInstance().getUserByFederatedIdAsync("google.com", "google_uid1234").get();
+    System.out.println("Successfully fetched user data: " + user.getUid());
+    // [END get_user_by_federated_id]
+  }
+
+  public void updateUserLinkFederated() throws Exception {
+    String uid = "someuid1234";
+    // [START update_user_link_federated]
+    // Link the user with a federated identity provider (like Google).
+    UserRecord.UpdateRequest update = new UserRecord.UpdateRequest(uid)
+        .setLinkProvider(
+              UserProvider.builder()
+                  .setProviderId("google.com")
+                  .setUid("google_uid1234")
+                  .build());
+
+    UserRecord user = FirebaseAuth.getInstance().updateUserAsync(update).get();
+    System.out.println("Successfully updated data: " + user.getUid());
+    // [END update_user_link_federated]
+  }
+
+  public void updateUserUnlinkFederated() throws Exception {
+    String uid = "someuid1234";
+    // [START update_user_unlink_federated]
+    // Unlink the user from a federated identity provider (like Google).
+    List<String> providers = new ArrayList<String>();
+    providers.add("google.com");
+
+    UserRecord.UpdateRequest update = new UserRecord.UpdateRequest(uid)
+        .setDeleteProviders(providers);
+
+    UserRecord user = FirebaseAuth.getInstance().updateUserAsync(update).get();
+    System.out.println("Successfully updated data: " + user.getUid());
+    // [END update_user_unlink_federated]
+  }
+}