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minio/object-utils.go

134 lines
4.1 KiB

/*
* 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 (
"io"
"regexp"
"strings"
"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
//
// You should avoid the following characters in a key name because of
// significant special handling for consistency across all
// applications.
//
// Rejects strings with following characters.
//
// - Backslash ("\")
// - Left curly brace ("{")
// - Caret ("^")
// - Right curly brace ("}")
// - Grave accent / back tick ("`")
// - Right square bracket ("]")
// - Left square bracket ("[")
// - Tilde ("~")
// - 'Greater Than' symbol (">")
// - 'Less Than' symbol ("<")
// - Vertical bar / pipe ("|")
func IsValidObjectName(object string) bool {
if len(object) > 1024 || len(object) == 0 {
return false
}
if !utf8.ValidString(object) {
return false
}
// Reject unsupported characters in object name.
return !strings.ContainsAny(object, "`^*{}[]|\\\"'")
}
// 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 or "/".
if object == "" || object == "/" {
return true
}
// Verify if prefix is a valid object name.
return IsValidObjectName(object)
}
// Slash separator.
const slashSeparator = "/"
// retainSlash - retains slash from a path.
func retainSlash(s string) string {
return strings.TrimSuffix(s, slashSeparator) + slashSeparator
}
// pathJoin - path join.
func pathJoin(s1 string, s2 string) string {
return retainSlash(s1) + s2
}
// validates location constraint from the request body.
// the location value in the request body should match the Region in serverConfig.
// other values of location are not accepted.
// make bucket fails in such cases.
func isValidLocationContraint(reqBody io.Reader, serverRegion string) APIErrorCode {
var locationContraint createBucketLocationConfiguration
var errCode APIErrorCode
errCode = ErrNone
e := xmlDecoder(reqBody, &locationContraint)
if e != nil {
if e == io.EOF {
// Do nothing.
// failed due to empty body. The location will be set to default value from the serverConfig.
// this is valid.
errCode = ErrNone
} else {
// Failed due to malformed configuration.
errCode = ErrMalformedXML
//writeErrorResponse(w, r, ErrMalformedXML, r.URL.Path)
}
} else {
// Region obtained from the body.
// It should be equal to Region in serverConfig.
// Else ErrInvalidRegion returned.
// For empty value location will be to set to default value from the serverConfig.
if locationContraint.Location != "" && serverRegion != locationContraint.Location {
//writeErrorResponse(w, r, ErrInvalidRegion, r.URL.Path)
errCode = ErrInvalidRegion
}
}
return errCode
}