Modify S3 endpoint regex pattern to support VPC endpoints.

apis/s3/src/main/java/org/jclouds/s3/filters/AwsHostNameUtils.java

@@ -26,7 +26,7 @@ import java.util.regex.Pattern;
 
 public class AwsHostNameUtils {
 
-   private static final Pattern S3_ENDPOINT_PATTERN = Pattern.compile("^(?:.+\\.)?s3[.-]([a-z0-9-]+)$");
+   private static final Pattern S3_ENDPOINT_PATTERN = Pattern.compile("^(?:.+\\.)?s3[.\\-]([a-z0-9-]+)(?>\\.[a-z0-9-]+)*$");
 
    private static final Pattern STANDARD_CLOUDSEARCH_ENDPOINT_PATTERN = Pattern.compile("^(?:.+\\.)?([a-z0-9-]+)\\.cloudsearch$");
 
@@ -107,7 +107,7 @@ public class AwsHostNameUtils {
 
       Matcher matcher = S3_ENDPOINT_PATTERN.matcher(fragment);
       if (matcher.matches()) {
-         // host was 'bucket.s3-[region].amazonaws.com'.
+         // host was '[whatever].s3[.|-]-[region].[whatever].amazonaws.com
          return matcher.group(1);
       }
 

apis/s3/src/test/java/org/jclouds/s3/filters/AwsHostNameUtilsTest.java

@@ -52,10 +52,20 @@ public class AwsHostNameUtilsTest {
          "s3"
       );
 
-
       Assert.assertEquals(
          AwsHostNameUtils.parseServiceName(URI.create("https://test-bucket.s3.cn-north-1.amazonaws.com.cn")),
          "s3"
       );
    }
+
+   @Test
+   // test s3 virtual private cloud URL
+   public void testVpcUrl() {
+      Assert.assertEquals(
+         AwsHostNameUtils.parseServiceName(
+              URI.create("https://bucket.vpce-0037af66cf9b0cc5e-zop31d9j.s3.us-east-1.vpce.amazonaws.com")
+         ),
+         "s3"
+      );
+   }
 }