refactor: refactor code to separate fs into object-layer and fs layer. (#1305)

object-utils.go

@@ -0,0 +1,65 @@
+/*
+ * Minio Cloud Storage, (C) 2015, 2016 Minio, Inc.
+ *
+ * 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 main
+
+import (
+	"regexp"
+	"unicode/utf8"
+)
+
+// validBucket regexp.
+var validBucket = regexp.MustCompile(`^[a-z0-9][a-z0-9\.\-]{1,61}[a-z0-9]$`)
+
+// IsValidBucketName verifies a bucket name in accordance with Amazon's
+// requirements. It must be 3-63 characters long, can contain dashes
+// and periods, but must begin and end with a lowercase letter or a number.
+// See: http://docs.aws.amazon.com/AmazonS3/latest/dev/BucketRestrictions.html
+func IsValidBucketName(bucket string) bool {
+	if len(bucket) < 3 || len(bucket) > 63 {
+		return false
+	}
+	if bucket[0] == '.' || bucket[len(bucket)-1] == '.' {
+		return false
+	}
+	return validBucket.MatchString(bucket)
+}
+
+// IsValidObjectName verifies an object name in accordance with Amazon's
+// requirements. It cannot exceed 1024 characters and must be a valid UTF8
+// string.
+// See: http://docs.aws.amazon.com/AmazonS3/latest/dev/UsingMetadata.html
+func IsValidObjectName(object string) bool {
+	if len(object) > 1024 || len(object) == 0 {
+		return false
+	}
+	if !utf8.ValidString(object) {
+		return false
+	}
+	return true
+}
+
+// IsValidObjectPrefix verifies whether the prefix is a valid object name.
+// Its valid to have a empty prefix.
+func IsValidObjectPrefix(object string) bool {
+	// Prefix can be empty.
+	if object == "" {
+		return true
+	}
+	// Verify if prefix is a valid object name.
+	return IsValidObjectName(object)
+
+}