Issue 257 naming constraints on s3 buckets

aws/core/src/main/java/org/jclouds/aws/s3/predicates/validators/BucketNameValidator.java

@@ -0,0 +1,59 @@
+package org.jclouds.aws.s3.predicates.validators;
+
+import static com.google.common.base.CharMatcher.is;
+
+import javax.inject.Inject;
+
+import org.jclouds.predicates.validators.DnsNameValidator;
+
+import com.google.common.base.CharMatcher;
+import com.google.inject.Singleton;
+
+/**
+ * Validates name for S3 buckets. The complete requirements are listed at:
+ * http://docs.amazonwebservices.com/AmazonS3/latest/index.html?BucketRestrictions.html
+ * 
+ * @see org.jclouds.rest.InputParamValidator
+ * @see org.jclouds.predicates.Validator
+ * 
+ * @author Adrian Cole
+ */
+@Singleton
+public class BucketNameValidator extends DnsNameValidator {
+
+   @Inject
+   BucketNameValidator() {
+      super(3, 63);
+   }
+
+   public void validate(String containerName) {
+      super.validate(containerName);
+      if (containerName.indexOf("..") != -1)
+         throw exception(containerName, "Bucket names cannot contain two, adjacent periods");
+      if (containerName.endsWith("-"))
+         throw exception(containerName, "Bucket names should not end with a dash");
+
+      if (containerName.indexOf("-.") != -1 || containerName.indexOf(".-") != -1)
+         throw exception(
+                  containerName,
+                  "Bucket names cannot contain dashes next to periods (e.g., \"my-.bucket.com\" and \"my.-bucket\" are invalid)");
+   }
+
+   @Override
+   protected IllegalArgumentException exception(String containerName, String reason) {
+      return new IllegalArgumentException(
+               String
+                        .format(
+                                 "Object '%s' doesn't match S3 bucket virtual host naming convention. "
+                                          + "Reason: %s. For more info, please refer to http://docs.amazonwebservices.com/AmazonS3/latest/index.html?BucketRestrictions.html.",
+                                 containerName, reason));
+   }
+
+   /**
+    * Amazon also permits periods in the dns name
+    */
+   @Override
+   protected CharMatcher getAcceptableRange() {
+      return super.getAcceptableRange().or(is('.'));
+   }
+}