Use @DefaultCredential for Cloud API access in GAE

This change completes the switch to @DefaultCredential for
all use cases in GAE.

Impacted modules:
- IcannReporting
- CreateCdnsTld command
- LoadSnapshot command.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=213511730

javatests/google/registry/bigquery/CheckedBigqueryTest.java

@@ -0,0 +1,107 @@
+// Copyright 2018 The Nomulus Authors. 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 google.registry.bigquery;
+
+import static com.google.common.truth.Truth.assertThat;
+import static google.registry.bigquery.BigqueryUtils.FieldType.STRING;
+import static org.mockito.Matchers.any;
+import static org.mockito.Matchers.eq;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import com.google.api.services.bigquery.Bigquery;
+import com.google.api.services.bigquery.model.Dataset;
+import com.google.api.services.bigquery.model.Table;
+import com.google.api.services.bigquery.model.TableFieldSchema;
+import com.google.api.services.bigquery.model.TableReference;
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.ImmutableMap;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+import org.mockito.ArgumentCaptor;
+
+/** Unit tests for {@link CheckedBigquery}. */
+@RunWith(JUnit4.class)
+public class CheckedBigqueryTest {
+
+  private final Bigquery bigquery = mock(Bigquery.class);
+  private final Bigquery.Datasets bigqueryDatasets = mock(Bigquery.Datasets.class);
+  private final Bigquery.Datasets.Insert bigqueryDatasetsInsert =
+      mock(Bigquery.Datasets.Insert.class);
+  private final Bigquery.Tables bigqueryTables = mock(Bigquery.Tables.class);
+  private final Bigquery.Tables.Insert bigqueryTablesInsert = mock(Bigquery.Tables.Insert.class);
+
+  private CheckedBigquery checkedBigquery;
+
+  @Before
+  public void before() throws Exception {
+    when(bigquery.datasets()).thenReturn(bigqueryDatasets);
+    when(bigqueryDatasets.insert(eq("Project-Id"), any(Dataset.class)))
+        .thenReturn(bigqueryDatasetsInsert);
+    when(bigquery.tables()).thenReturn(bigqueryTables);
+    when(bigqueryTables.insert(eq("Project-Id"), any(String.class), any(Table.class)))
+        .thenReturn(bigqueryTablesInsert);
+    checkedBigquery = new CheckedBigquery();
+    checkedBigquery.bigquery = bigquery;
+    checkedBigquery.bigquerySchemas =
+        new ImmutableMap.Builder<String, ImmutableList<TableFieldSchema>>()
+            .put(
+                "Table-Id",
+                ImmutableList.of(new TableFieldSchema().setName("column1").setType(STRING.name())))
+            .put(
+                "Table2",
+                ImmutableList.of(new TableFieldSchema().setName("column1").setType(STRING.name())))
+            .build();
+  }
+
+  @Test
+  public void testSuccess_datastoreCreation() throws Exception {
+    checkedBigquery.ensureDataSetExists("Project-Id", "Dataset-Id");
+
+    ArgumentCaptor<Dataset> datasetArg = ArgumentCaptor.forClass(Dataset.class);
+    verify(bigqueryDatasets).insert(eq("Project-Id"), datasetArg.capture());
+    assertThat(datasetArg.getValue().getDatasetReference().getProjectId())
+        .isEqualTo("Project-Id");
+    assertThat(datasetArg.getValue().getDatasetReference().getDatasetId())
+        .isEqualTo("Dataset-Id");
+    verify(bigqueryDatasetsInsert).execute();
+  }
+
+  @Test
+  public void testSuccess_datastoreAndTableCreation() throws Exception {
+    checkedBigquery.ensureDataSetAndTableExist("Project-Id", "Dataset2", "Table2");
+
+    ArgumentCaptor<Dataset> datasetArg = ArgumentCaptor.forClass(Dataset.class);
+    verify(bigqueryDatasets).insert(eq("Project-Id"), datasetArg.capture());
+    assertThat(datasetArg.getValue().getDatasetReference().getProjectId())
+        .isEqualTo("Project-Id");
+    assertThat(datasetArg.getValue().getDatasetReference().getDatasetId())
+        .isEqualTo("Dataset2");
+    verify(bigqueryDatasetsInsert).execute();
+
+    ArgumentCaptor<Table> tableArg = ArgumentCaptor.forClass(Table.class);
+    verify(bigqueryTables).insert(eq("Project-Id"), eq("Dataset2"), tableArg.capture());
+    TableReference ref = tableArg.getValue().getTableReference();
+    assertThat(ref.getProjectId()).isEqualTo("Project-Id");
+    assertThat(ref.getDatasetId()).isEqualTo("Dataset2");
+    assertThat(ref.getTableId()).isEqualTo("Table2");
+    assertThat(tableArg.getValue().getSchema().getFields())
+        .containsExactly(new TableFieldSchema().setName("column1").setType(STRING.name()));
+    verify(bigqueryTablesInsert).execute();
+  }
+}