docs: Adding Samples for printing all Acls for a file and for a speci…

…fic user

samples/snippets/src/main/java/com/example/storage/object/PrintFileAcl.java

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+/*
+ * Copyright 2022 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.
+ */
+
+package com.example.storage.object;
+
+// [START storage_print_file_acl]
+
+import com.google.cloud.storage.Acl;
+import com.google.cloud.storage.Blob;
+import com.google.cloud.storage.BlobId;
+import com.google.cloud.storage.Storage;
+import com.google.cloud.storage.StorageOptions;
+import java.util.List;
+
+public class PrintFileAcl {
+
+  public static void printFileAcl(String bucketName, String blobName) {
+
+    // The ID to give your GCS bucket
+    // String bucketName = "your-unique-bucket-name";
+
+    // The name of the blob/file that you wish to view Acls of
+    // String blobName = "your-blob-name";
+
+    Storage storage = StorageOptions.newBuilder().build().getService();
+    Blob blob = storage.get(BlobId.of(bucketName, blobName));
+    List<Acl> blobAcls = blob.getAcl();
+
+    for (Acl acl : blobAcls) {
+
+      // This will give you the role.
+      // See https://cloud.google.com/storage/docs/access-control/lists#permissions
+      String role = acl.getRole().name();
+
+      // This will give you the Entity type (i.e. User, Group, Project etc.)
+      // See https://cloud.google.com/storage/docs/access-control/lists#scopes
+      String entityType = acl.getEntity().getType().name();
+
+      System.out.printf("%s: %s \n", role, entityType);
+    }
+  }
+
+}
+// [END storage_print_file_acl]

samples/snippets/src/main/java/com/example/storage/object/PrintFileAclForUser.java

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+/*
+ * Copyright 2022 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.
+ */
+
+package com.example.storage.object;
+
+// [START storage_print_file_acl_for_user]
+
+import com.google.cloud.storage.Acl;
+import com.google.cloud.storage.Acl.User;
+import com.google.cloud.storage.Blob;
+import com.google.cloud.storage.BlobId;
+import com.google.cloud.storage.Storage;
+import com.google.cloud.storage.StorageOptions;
+
+public class PrintFileAclForUser {
+
+  public static void printFileAclForUser(String bucketName, String blobName, String userEmail) {
+
+    // The ID to give your GCS bucket
+    // String bucketName = "your-unique-bucket-name";
+
+    // The name of the blob/file that you wish to view Acls of
+    // String blobName = "your-blob-name";
+
+    // The email of the user whose acl is being retrieved.
+    // String userEmail = "someuser@domain.com"
+
+    Storage storage = StorageOptions.newBuilder().build().getService();
+    Blob blob = storage.get(BlobId.of(bucketName, blobName));
+    Acl blobAcl = blob.getAcl(new User(userEmail));
+    String userRole = blobAcl.getRole().name();
+
+    System.out.println("User " + userEmail + " has role " + userRole);
+  }
+}
+// [END storage_print_file_acl_for_user]

samples/snippets/src/test/java/com/example/storage/object/PrintFileAclForUserTest.java

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+/*
+ * Copyright 2022 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.
+ */
+
+package com.example.storage.object;
+
+import static com.google.common.truth.Truth.assertThat;
+import static org.junit.Assert.assertNotNull;
+
+import com.example.storage.TestBase;
+import com.google.cloud.storage.Acl;
+import com.google.cloud.storage.Acl.Entity;
+import com.google.cloud.storage.Acl.Role;
+import com.google.cloud.storage.Acl.User;
+import org.junit.Test;
+
+public class PrintFileAclForUserTest extends TestBase {
+
+  public static final String IT_SERVICE_ACCOUNT_EMAIL = System.getenv("IT_SERVICE_ACCOUNT_EMAIL");
+
+  @Test
+  public void testPrintBucketAclByUser() {
+    // Check for user email before the actual test.
+    assertNotNull("Unable to determine user email", IT_SERVICE_ACCOUNT_EMAIL);
+
+    Entity testUser = new User(IT_SERVICE_ACCOUNT_EMAIL);
+    blob.createAcl(Acl.of(testUser, Role.READER));
+    PrintFileAclForUser.printFileAclForUser(bucketName, blobName, IT_SERVICE_ACCOUNT_EMAIL);
+    assertThat(stdOut.getCapturedOutputAsUtf8String()).contains(IT_SERVICE_ACCOUNT_EMAIL);
+    assertThat(stdOut.getCapturedOutputAsUtf8String()).contains(Role.READER.name());
+  }
+}

samples/snippets/src/test/java/com/example/storage/object/PrintFileAclTest.java

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+/*
+ * Copyright 2022 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.
+ */
+
+package com.example.storage.object;
+
+import static com.google.common.truth.Truth.assertThat;
+import static org.junit.Assert.assertNotNull;
+
+import com.example.storage.TestBase;
+import com.google.cloud.storage.Acl;
+import com.google.cloud.storage.Acl.Entity;
+import com.google.cloud.storage.Acl.Role;
+import com.google.cloud.storage.Acl.User;
+import org.junit.Test;
+
+public class PrintFileAclTest extends TestBase {
+
+  public static final String IT_SERVICE_ACCOUNT_EMAIL = System.getenv("IT_SERVICE_ACCOUNT_EMAIL");
+
+  @Test
+  public void testPrintFileAcls() {
+    // Check for user email before the actual test.
+    assertNotNull("Unable to determine user email", IT_SERVICE_ACCOUNT_EMAIL);
+
+    Entity testUser = new User(IT_SERVICE_ACCOUNT_EMAIL);
+    blob.createAcl(Acl.of(testUser, Role.READER));
+    PrintFileAcl.printFileAcl(bucketName, blobName);
+    assertThat(stdOut.getCapturedOutputAsUtf8String()).contains("READER: USER");
+  }
+}