feat: add support for universe domain (phase 1)

src/Credentials/ServiceAccountCredentials.php

@@ -99,6 +99,11 @@ class ServiceAccountCredentials extends CredentialsLoader implements
      */
     private $jwtAccessCredentials;
 
+    /**
+     * @var string|null
+     */
+    private ?string $universeDomain;
+
     /**
      * Create a new ServiceAccountCredentials.
      *
@@ -159,6 +164,7 @@ public function __construct(
         ]);
 
         $this->projectId = $jsonKey['project_id'] ?? null;
+        $this->universeDomain = $jsonKey['universe_domain'] ?? null;
     }
 
     /**
@@ -328,6 +334,19 @@ public function getQuotaProject()
         return $this->quotaProject;
     }
 
+    /**
+     * Get the universe domain configured in the JSON credential.
+     *
+     * @return string
+     */
+    public function getUniverseDomain(): string
+    {
+        if (null === $this->universeDomain) {
+            return self::DEFAULT_UNIVERSE_DOMAIN;
+        }
+        return $this->universeDomain;
+    }
+
     /**
      * @return bool
      */

src/CredentialsLoader.php

@@ -30,6 +30,7 @@
  * credentials files on the file system.
  */
 abstract class CredentialsLoader implements
+    GetUniverseDomainInterface,
     FetchAuthTokenInterface,
     UpdateMetadataInterface
 {
@@ -273,4 +274,15 @@ private static function loadDefaultClientCertSourceFile()
         }
         return $clientCertSourceJson;
     }
+
+    /**
+     * Get the universe domain from the credential. Defaults to "googleapis.com"
+     * for all credential types which do not support universe domain.
+     *
+     * @return string
+     */
+    public function getUniverseDomain(): string
+    {
+        return self::DEFAULT_UNIVERSE_DOMAIN;
+    }
 }

src/FetchAuthTokenCache.php

@@ -26,6 +26,7 @@
 class FetchAuthTokenCache implements
     FetchAuthTokenInterface,
     GetQuotaProjectInterface,
+    GetUniverseDomainInterface,
     SignBlobInterface,
     ProjectIdProviderInterface,
     UpdateMetadataInterface
@@ -191,6 +192,20 @@ public function getProjectId(callable $httpHandler = null)
         return $this->fetcher->getProjectId($httpHandler);
     }
 
+    /*
+     * Get the Universe Domain from the fetcher.
+     *
+     * @return string
+     */
+    public function getUniverseDomain(): string
+    {
+        if ($this->fetcher instanceof GetUniverseDomainInterface) {
+            return $this->fetcher->getUniverseDomain();
+        }
+
+        return GetUniverseDomainInterface::DEFAULT_UNIVERSE_DOMAIN;
+    }
+
     /**
      * Updates metadata with the authorization token.
      *

src/GetUniverseDomainInterface.php

@@ -0,0 +1,35 @@
+<?php
+/*
+ * Copyright 2023 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.
+ */
+
+namespace Google\Auth;
+
+/**
+ * An interface implemented by objects that can get universe domain for Google Cloud APIs.
+ */
+interface GetUniverseDomainInterface
+{
+    const DEFAULT_UNIVERSE_DOMAIN = 'googleapis.com';
+
+    /**
+     * Get the universe domain from the credential. This should always return
+     * a string, and default to "googleapis.com" if no universe domain is
+     * configured.
+     *
+     * @return string
+     */
+    public function getUniverseDomain(): string;
+}

tests/ApplicationDefaultCredentialsTest.php

@@ -783,4 +783,26 @@ public function provideExternalAccountCredentials()
             ['aws_credentials.json', CredentialSource\AwsNativeSource::class],
         ];
     }
+
+    /** @runInSeparateProcess */
+    public function testUniverseDomainInKeyFile()
+    {
+        // Test no universe domain in keyfile defaults to "googleapis.com"
+        $keyFile = __DIR__ . '/fixtures3/service_account_credentials.json';
+        putenv(ServiceAccountCredentials::ENV_VAR . '=' . $keyFile);
+        $creds = ApplicationDefaultCredentials::getCredentials();
+        $this->assertEquals(CredentialsLoader::DEFAULT_UNIVERSE_DOMAIN, $creds->getUniverseDomain());
+
+        // Test universe domain in "service_account" keyfile
+        $keyFile = __DIR__ . '/fixtures/private.json';
+        putenv(ServiceAccountCredentials::ENV_VAR . '=' . $keyFile);
+        $creds = ApplicationDefaultCredentials::getCredentials();
+        $this->assertEquals('example-universe.com', $creds->getUniverseDomain());
+
+        // Test universe domain in "authenticated_user" keyfile is not read.
+        $keyFile = __DIR__ . '/fixtures2/private.json';
+        putenv(ServiceAccountCredentials::ENV_VAR . '=' . $keyFile);
+        $creds2 = ApplicationDefaultCredentials::getCredentials();
+        $this->assertEquals(CredentialsLoader::DEFAULT_UNIVERSE_DOMAIN, $creds2->getUniverseDomain());
+    }
 }

tests/Credentials/GCECredentialsTest.php

@@ -512,4 +512,12 @@ public function testGetClientNameWithServiceAccountIdentity()
         $creds = new GCECredentials(null, null, null, null, 'foo');
         $this->assertEquals($expected, $creds->getClientName($httpHandler));
     }
+
+    public function testGetUniverseDomain()
+    {
+        $creds = new GCECredentials();
+
+        // Universe domain should always be the default
+        $this->assertEquals(GCECredentials::DEFAULT_UNIVERSE_DOMAIN, $creds->getUniverseDomain());
+    }
 }

tests/FetchAuthTokenCacheTest.php

@@ -21,6 +21,7 @@
 use Google\Auth\Credentials\ServiceAccountCredentials;
 use Google\Auth\CredentialsLoader;
 use Google\Auth\FetchAuthTokenCache;
+use Google\Auth\GetUniverseDomainInterface;
 use Prophecy\Argument;
 use Prophecy\PhpUnit\ProphecyTrait;
 use RuntimeException;
@@ -603,6 +604,41 @@ public function testGetProjectIdInvalidFetcher()
         $fetcher->getProjectId();
     }
 
+    public function testGetUniverseDomain()
+    {
+        $universeDomain = 'foobar';
+
+        $mockFetcher = $this->prophesize('Google\Auth\GetUniverseDomainInterface');
+        $mockFetcher->willImplement('Google\Auth\FetchAuthTokenInterface');
+        $mockFetcher->getUniverseDomain()
+            ->shouldBeCalled()
+            ->willReturn($universeDomain);
+
+        $fetcher = new FetchAuthTokenCache(
+            $mockFetcher->reveal(),
+            [],
+            $this->mockCache->reveal()
+        );
+
+        $this->assertEquals($universeDomain, $fetcher->getUniverseDomain());
+    }
+
+    public function testGetUniverseDomainInvalidFetcher()
+    {
+        $mockFetcher = $this->prophesize('Google\Auth\FetchAuthTokenInterface');
+
+        $fetcher = new FetchAuthTokenCache(
+            $mockFetcher->reveal(),
+            [],
+            $this->mockCache->reveal()
+        );
+
+        $this->assertEquals(
+            GetUniverseDomainInterface::DEFAULT_UNIVERSE_DOMAIN,
+            $fetcher->getUniverseDomain()
+        );
+    }
+
     public function testGetFetcher()
     {
         $mockFetcher = $this->prophesize('Google\Auth\FetchAuthTokenInterface')

tests/fixtures/private.json

@@ -4,5 +4,6 @@
   "client_email": "hello@youarecool.com",
   "client_id": "client123",
   "type": "service_account",
-  "quota_project_id": "test_quota_project"
+  "quota_project_id": "test_quota_project",
+  "universe_domain": "example-universe.com"
 }

tests/fixtures2/private.json

@@ -3,5 +3,6 @@
   "client_secret": "clientSecret123",
   "refresh_token": "refreshToken123",
   "type": "authorized_user",
-  "quota_project_id": "test_quota_project"
+  "quota_project_id": "test_quota_project",
+  "universe_domain": "example-universe.com"
 }