feat: create java sample for authorizing in google cloud using api key credentials

Author: ldetmer

auth/README.md

@@ -35,6 +35,11 @@ You can then run a given `ClassName` via:
     mvn exec:java -Dexec.mainClass=com.google.cloud.auth.samples.AuthExample
         -Dexec.args="compute"
 
+### Authenticating using an api key
+
+    mvn exec:java -Dexec.mainClass=com.google.cloud.auth.samples.AuthExample
+        -Dexec.args="apikey [api key]"
+
 ## Downscoping with Credential Access Boundaries
 
 The same configuration above applies. 
@@ -44,7 +49,7 @@ you must provide both a bucket name and object name under the TODO(developer): i
 
 You can then run `DownscopingExample` via:
 
-	mvn exec:exec
+	mvn exec:java -Dexec.mainClass=com.google.cloud.auth.samples.DownscopingExample
 
 ## Tests
 Run all tests:

auth/pom.xml

@@ -48,7 +48,7 @@ limitations under the License.
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>libraries-bom</artifactId>
-        <version>26.32.0</version>
+        <version>26.49.0</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>
@@ -72,6 +72,10 @@ limitations under the License.
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-apikeys</artifactId>
     </dependency>
+    <dependency>
+      <groupId>com.google.cloud</groupId>
+      <artifactId>google-cloud-language</artifactId>
+    </dependency>
     <!-- END dependencies -->
     <dependency>
       <groupId>junit</groupId>
@@ -104,11 +108,6 @@ limitations under the License.
         </executions>
         <configuration>
           <executable>java</executable>
-          <arguments>
-            <argument>-classpath</argument>
-            <classpath />
-            <argument>com.google.cloud.auth.samples.DownscopingExample</argument>
-          </arguments>
         </configuration>
       </plugin>
     </plugins>

auth/src/main/java/com/google/cloud/auth/samples/AuthExample.java

@@ -26,6 +26,10 @@
 import com.google.common.collect.Lists;
 import java.io.FileInputStream;
 import java.io.IOException;
+import com.google.cloud.language.v2.AnalyzeSentimentResponse;
+import com.google.cloud.language.v2.Document;
+import com.google.cloud.language.v2.LanguageServiceClient;
+import com.google.cloud.language.v2.LanguageServiceSettings;
 
 /**
  * Demonstrate various ways to authenticate requests using Cloud Storage as an example call.
@@ -89,6 +93,21 @@ static void authAppEngineStandard() throws IOException {
   }
   // [END auth_cloud_explicit_app_engine]
 
+  // [START auth_cloud_api_key]
+  static void authApiKey(String apiKey) throws IOException {
+    LanguageServiceSettings settings =
+        LanguageServiceSettings.newBuilder().setApiKey(apiKey).build();
+    LanguageServiceClient client = LanguageServiceClient.create(settings);
+
+    Document document =
+        Document.newBuilder().setContent("Hello World!").setType(Document.Type.PLAIN_TEXT).build();
+
+    AnalyzeSentimentResponse actualResponse = client.analyzeSentiment(document);
+    System.out.println("response " + actualResponse.getDocumentSentiment().toString());
+    System.exit(0);
+  }
+  // [END auth_cloud_api_keys]
+
   public static void main(String[] args) throws IOException {
     if (args.length == 0) {
       authImplicit();
@@ -110,6 +129,15 @@ public static void main(String[] args) throws IOException {
       authAppEngineStandard();
       return;
     }
+    if ("apikey".equals(args[0])) {
+        if (args.length >= 2) {
+          authApiKey(args[1]);
+        } else {
+          throw new IllegalArgumentException("Api key is required with 'apikey'.");
+        }
+        return;
+      }
+
     authImplicit();
   }
 }