feat: add properties to customize universe-domain and host in Storage

docs/src/main/asciidoc/storage.adoc

@@ -119,6 +119,8 @@ The Spring Boot Starter for Google Cloud Storage provides the following configur
 Base64-encoded contents of OAuth2 account private key for authenticating with the Google Cloud Storage API, if different from the ones in the <<spring-cloud-gcp-core,Spring Framework on Google Cloud Core Module>> | No |
 | `spring.cloud.gcp.storage.credentials.scopes` |
 https://developers.google.com/identity/protocols/googlescopes[OAuth2 scope] for Spring Framework on Google Cloud Storage credentials | No | https://www.googleapis.com/auth/devstorage.read_write
+| `spring.cloud.gcp.storage.universe-domain` | Universe domain of the Storage service. The universe domain is a part of the host that is formatted as `https://${service}.${universeDomain}/` | No | Relies on client library’s default universe domain which is `googleapis.com`
+| `spring.cloud.gcp.storage.host` | Host of the Storage service which expects `https://${service}.${universeDomain}/` as the format. | No | Relies on client library’s default host which is `https://storage.googleapis.com/`
 |===
 
 

spring-cloud-gcp-autoconfigure/src/main/java/com/google/cloud/spring/autoconfigure/bigquery/GcpBigQueryAutoConfiguration.java

@@ -160,7 +160,7 @@ public BigQueryTemplate bigQueryTemplate(
         bigQuery, bigQueryWriteClient, bqInitSettings, bigQueryThreadPoolTaskScheduler);
   }
 
-  private String resolveToHost(String endpoint) throws URISyntaxException {
+  private String resolveToHost(String endpoint) {
     int portIndex = endpoint.indexOf(":");
     if (portIndex != -1) {
       return "https://" + endpoint.substring(0, portIndex) + "/";

spring-cloud-gcp-autoconfigure/src/main/java/com/google/cloud/spring/autoconfigure/bigquery/GcpBigQueryProperties.java

@@ -45,10 +45,17 @@ public class GcpBigQueryProperties implements CredentialsSupplier {
   /** The size of thread pool of ThreadPoolTaskScheduler used by GcpBigQueryAutoConfiguration */
   private int threadPoolSize;
 
+  /**
+   * Universe domain of the BigQuery and BigQueryWriteClient which is part of the endpoint that is
+   * formatted as `{service}.{universeDomain}:${port}`.
+   */
   private String universeDomain;
 
   /**
-   * Endpoint (formatted as `{service}.{universeDomain}:${port}`)
+   * Endpoint of the BigQuery and BigQueryWriteClient. Formatted as
+   * `{service}.{universeDomain}:${port}`. Note that endpoint will be reformatted in {@link
+   * GcpBigQueryAutoConfiguration} to follow the `https://${service}.${universeDomain}/` pattern
+   * before being applied to the BigQuery client.
    */
   private String endpoint;
 

spring-cloud-gcp-autoconfigure/src/main/java/com/google/cloud/spring/autoconfigure/kms/GcpKmsProperties.java

@@ -31,8 +31,14 @@ public class GcpKmsProperties implements CredentialsSupplier {
 
   /** Overrides the GCP Project ID specified in the Core module. */
   private String projectId;
+
+  /**
+   * Universe domain of the client which is part of the endpoint that is formatted as
+   * `${service}.${universeDomain}:${port}`
+   */
   private String universeDomain;
 
+  /** Endpoint of the KMS client which is formatted as`${service}.${universeDomain}:${port}` */
   private String endpoint;
 
   @Override

spring-cloud-gcp-autoconfigure/src/main/java/com/google/cloud/spring/autoconfigure/storage/GcpStorageAutoConfiguration.java

@@ -26,6 +26,8 @@
 import com.google.cloud.storage.Storage;
 import com.google.cloud.storage.StorageOptions;
 import java.io.IOException;
+import java.net.MalformedURLException;
+import java.net.URL;
 import org.springframework.boot.autoconfigure.AutoConfiguration;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
@@ -52,6 +54,10 @@ public class GcpStorageAutoConfiguration { // NOSONAR squid:S1610 must be a clas
 
   private final CredentialsProvider credentialsProvider;
 
+  private final String universeDomain;
+
+  private final String host;
+
   public GcpStorageAutoConfiguration(
       GcpProjectIdProvider coreProjectIdProvider,
       CredentialsProvider credentialsProvider,
@@ -67,16 +73,46 @@ public GcpStorageAutoConfiguration(
         gcpStorageProperties.getCredentials().hasKey()
             ? new DefaultCredentialsProvider(gcpStorageProperties)
             : credentialsProvider;
+
+    this.universeDomain = gcpStorageProperties.getUniverseDomain();
+    this.host = gcpStorageProperties.getHost();
   }
 
   @Bean
   @ConditionalOnMissingBean
   public Storage storage() throws IOException {
-    return StorageOptions.newBuilder()
-        .setHeaderProvider(new UserAgentHeaderProvider(GcpStorageAutoConfiguration.class))
-        .setProjectId(this.gcpProjectIdProvider.getProjectId())
-        .setCredentials(this.credentialsProvider.getCredentials())
-        .build()
-        .getService();
+    StorageOptions.Builder storageOptionsBuilder =
+        StorageOptions.newBuilder()
+            .setHeaderProvider(new UserAgentHeaderProvider(GcpStorageAutoConfiguration.class))
+            .setProjectId(this.gcpProjectIdProvider.getProjectId())
+            .setCredentials(this.credentialsProvider.getCredentials());
+
+    if (this.universeDomain != null) {
+      storageOptionsBuilder.setUniverseDomain(this.universeDomain);
+    }
+    if (this.host != null) {
+      storageOptionsBuilder.setHost(verifyAndFetchHost(this.host));
+    }
+    return storageOptionsBuilder.build().getService();
+  }
+
+  /**
+   * Verifies and returns host in the `https://${service}.${universeDomain}/` format, following
+   * convention in com.google.cloud.ServiceOptions#getResolvedApiaryHost().
+   *
+   * @param host host provided through `spring.cloud.gcp.storage.host` property
+   * @return host formatted as `https://${service}.${universeDomain}/`
+   */
+  private String verifyAndFetchHost(String host) {
+    URL url;
+    try {
+      url = new URL(host);
+    } catch (MalformedURLException e) {
+      throw new IllegalArgumentException(
+          "Invalid host format: "
+              + host
+              + ". Please verify that the specified host follows the 'https://${service}.${universeDomain}/' format");
+    }
+    return url.getProtocol() + "://" + url.getHost() + "/";
   }
 }

spring-cloud-gcp-autoconfigure/src/main/java/com/google/cloud/spring/autoconfigure/storage/GcpStorageProperties.java

@@ -38,11 +38,36 @@ public Credentials getCredentials() {
 
   private String projectId;
 
+  /**
+   * Universe domain of the client which is part of the host that is formatted as
+   * `https://${service}.${universeDomain}/`.
+   */
+  private String universeDomain;
+
+  /** Host of the Storage client that is formatted as `https://${service}.${universeDomain}/`. */
+  private String host;
+
   public String getProjectId() {
     return projectId;
   }
 
   public void setProjectId(String projectId) {
     this.projectId = projectId;
   }
+
+  public String getUniverseDomain() {
+    return universeDomain;
+  }
+
+  public void setUniverseDomain(String universeDomain) {
+    this.universeDomain = universeDomain;
+  }
+
+  public String getHost() {
+    return host;
+  }
+
+  public void setHost(String host) {
+    this.host = host;
+  }
 }

spring-cloud-gcp-autoconfigure/src/test/java/com/google/cloud/spring/autoconfigure/storage/GcpStorageAutoConfigurationTests.java

@@ -17,6 +17,7 @@
 package com.google.cloud.spring.autoconfigure.storage;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.Assert.assertThrows;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.when;
 
@@ -48,27 +49,31 @@ class GcpStorageAutoConfigurationTests {
           .withUserConfiguration(TestConfiguration.class);
 
   @Test
-  void testValidObject() throws Exception {
-    this.contextRunner.run(
-        context -> {
-          Resource resource = context.getBean("mockResource", Resource.class);
-          assertThat(resource.contentLength()).isEqualTo(4096);
-        });
+  void testValidObject() {
+    this.contextRunner
+        .withUserConfiguration(TestStorageConfiguration.class)
+        .run(
+            context -> {
+              Resource resource = context.getBean("mockResource", Resource.class);
+              assertThat(resource.contentLength()).isEqualTo(4096);
+            });
   }
 
   @Test
-  void testAutoCreateFilesTrueByDefault() throws IOException {
-    this.contextRunner.run(
-        context -> {
-          Resource resource = context.getBean("mockResource", Resource.class);
-          assertThat(((GoogleStorageResource) resource).isAutoCreateFiles()).isTrue();
-        });
+  void testAutoCreateFilesTrueByDefault() {
+    this.contextRunner
+        .withUserConfiguration(TestStorageConfiguration.class)
+        .run(
+            context -> {
+              Resource resource = context.getBean("mockResource", Resource.class);
+              assertThat(((GoogleStorageResource) resource).isAutoCreateFiles()).isTrue();
+            });
   }
 
   @Test
-  void testAutoCreateFilesRespectsProperty() throws IOException {
-
+  void testAutoCreateFilesRespectsProperty() {
     this.contextRunner
+        .withUserConfiguration(TestStorageConfiguration.class)
         .withPropertyValues("spring.cloud.gcp.storage.auto-create-files=false")
         .run(
             context -> {
@@ -77,9 +82,85 @@ void testAutoCreateFilesRespectsProperty() throws IOException {
             });
   }
 
+  @Test
+  void testUniverseDomain() {
+    this.contextRunner
+        .withPropertyValues("spring.cloud.gcp.storage.universe-domain=example.com")
+        .run(
+            context -> {
+              Storage storage = context.getBean("storage", Storage.class);
+              assertThat(storage.getOptions().getUniverseDomain()).isEqualTo("example.com");
+              assertThat(storage.getOptions().getHost()).isEqualTo("https://storage.example.com/");
+            });
+  }
+
+  @Test
+  void testHost() {
+    this.contextRunner
+        .withPropertyValues("spring.cloud.gcp.storage.host=https://storage.example.com/")
+        .run(
+            context -> {
+              Storage storage = context.getBean("storage", Storage.class);
+              assertThat(storage.getOptions().getHost()).isEqualTo("https://storage.example.com/");
+            });
+  }
+
+  @Test
+  void testUniverseDomainAndHostSet() {
+    this.contextRunner
+        .withPropertyValues(
+            "spring.cloud.gcp.storage.universe-domain=example.com",
+            "spring.cloud.gcp.storage.host=https://storage.example.com")
+        .run(
+            context -> {
+              Storage storage = context.getBean("storage", Storage.class);
+              assertThat(storage.getOptions().getUniverseDomain()).isEqualTo("example.com");
+              assertThat(storage.getOptions().getHost()).isEqualTo("https://storage.example.com/");
+            });
+  }
+
+  @Test
+  void testNoUniverseDomainOrHostSet_useDefaults() {
+    this.contextRunner.run(
+        context -> {
+          Storage storage = context.getBean("storage", Storage.class);
+          assertThat(storage.getOptions().getUniverseDomain()).isNull();
+          assertThat(storage.getOptions().getHost()).isEqualTo("https://storage.googleapis.com/");
+        });
+  }
+
+  @Test
+  void testInvalidHost_throwsException() {
+    this.contextRunner
+        .withPropertyValues("spring.cloud.gcp.storage.host=storage.example.com")
+        .run(
+            context -> {
+              Exception exception =
+                  assertThrows(Exception.class, () -> context.getBean("storage", Storage.class));
+              assertThat(exception).hasRootCauseInstanceOf(IllegalArgumentException.class);
+              assertThat(exception)
+                  .hasRootCauseMessage(
+                      "Invalid host format: storage.example.com. Please verify that the specified host follows the 'https://${service}.${universeDomain}/' format");
+            });
+  }
+
   @Configuration
   static class TestConfiguration {
 
+    @Bean
+    public static CredentialsProvider googleCredentials() {
+      return () -> mock(Credentials.class);
+    }
+
+    @Bean
+    public static GcpProjectIdProvider gcpProjectIdProvider() {
+      return () -> "default-project";
+    }
+  }
+
+  @Configuration
+  static class TestStorageConfiguration {
+
     @Value("gs://test-spring/images/spring.png")
     private Resource remoteResource;
 
@@ -98,15 +179,5 @@ public static Storage mockStorage() throws Exception {
       when(storage.get(validBlob)).thenReturn(mockedBlob);
       return storage;
     }
-
-    @Bean
-    public static CredentialsProvider googleCredentials() {
-      return () -> mock(Credentials.class);
-    }
-
-    @Bean
-    public static GcpProjectIdProvider gcpProjectIdProvider() {
-      return () -> "default-project";
-    }
   }
 }