feat: add functions_firebase_auth (#2050)

* feat: add functions_firebase_auth

* Update FirebaseAuth.java

* feat: add json parsing logic

Author: grant

functions/snippets/pom.xml

@@ -67,6 +67,14 @@
       <version>1.19.0</version>
       <scope>test</scope>
     </dependency>
+
+    <!-- Required for Function primitives -->
+    <dependency>
+      <groupId>com.google.cloud.functions</groupId>
+      <artifactId>functions-framework-api</artifactId>
+      <version>1.0.0-alpha-2-rc3</version>
+      <type>jar</type>
+    </dependency>
   </dependencies>
 
   <!-- Required for Java 8 (Alpha) functions in the inline editor -->

functions/snippets/src/main/java/FirebaseAuth.java

@@ -0,0 +1,38 @@
+/*
+ * Copyright 2019 Google LLC
+ *
+ * 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.
+ */
+
+// [START functions_firebase_auth]
+import com.google.cloud.functions.Context;
+import com.google.cloud.functions.RawBackgroundFunction;
+import com.google.gson.Gson;
+import com.google.gson.JsonObject;
+import java.util.logging.Logger;
+
+public class FirebaseAuth implements RawBackgroundFunction {
+
+  // Use GSON (https://github.com/google/gson) to parse JSON content.
+  private Gson gsonParser = new Gson();
+
+  private static final Logger LOGGER = Logger.getLogger(FirebaseAuth.class.getName());
+
+  @Override
+  public void accept(String json, Context context) {
+    JsonObject body = gsonParser.fromJson(json, JsonObject.class);
+    LOGGER.info("Function triggered by event: " + json);
+  }
+}
+
+// [END functions_firebase_auth]

functions/snippets/src/test/java/SnippetsTests.java

@@ -217,4 +217,9 @@ public void helloExecutionCount() throws IOException {
     new Concepts().executionCount(request, response);
     assertThat(responseOut.toString(), containsString("Instance execution count: 1"));
   }
+
+  @Test
+  public void firebaseAuth() throws IOException {
+    new FirebaseAuth().accept("{\"foo\": \"bar\"}", null);
+  }
 }