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gitea/vendor/github.com/minio/minio-go/v7/pkg/s3utils/utils.go
6543 c4deb97ed1
[Vendor] Update Batch 2020-11 (#13746)
* github.com/alecthomas/chroma v0.8.1 -> v0.8.2

Changelog: https://github.com/alecthomas/chroma/releases/tag/v0.8.2

* github.com/blevesearch/bleve v1.0.12 -> v1.0.13

Changelog: https://github.com/blevesearch/bleve/releases/tag/v1.0.13

* github.com/editorconfig/editorconfig-core-go v2.3.8 -> v2.3.9

Changelog: https://github.com/editorconfig/editorconfig-core-go/releases/tag/v2.3.9

* github.com/klauspost/compress v1.11.2 -> v1.11.3

Changelog: https://github.com/klauspost/compress/releases/tag/v1.11.3

* github.com/minio/minio-go v7.0.5 -> v7.0.6

Changelog: https://github.com/minio/minio-go/releases/tag/v7.0.6

Co-authored-by: Lauris BH <lauris@nix.lv>
2020-11-29 15:54:08 -05:00

385 lines
12 KiB
Go
Vendored

/*
* MinIO Go Library for Amazon S3 Compatible Cloud Storage
* Copyright 2015-2020 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 s3utils
import (
"bytes"
"encoding/hex"
"errors"
"net"
"net/url"
"regexp"
"sort"
"strings"
"unicode/utf8"
)
// Sentinel URL is the default url value which is invalid.
var sentinelURL = url.URL{}
// IsValidDomain validates if input string is a valid domain name.
func IsValidDomain(host string) bool {
// See RFC 1035, RFC 3696.
host = strings.TrimSpace(host)
if len(host) == 0 || len(host) > 255 {
return false
}
// host cannot start or end with "-"
if host[len(host)-1:] == "-" || host[:1] == "-" {
return false
}
// host cannot start or end with "_"
if host[len(host)-1:] == "_" || host[:1] == "_" {
return false
}
// host cannot start with a "."
if host[:1] == "." {
return false
}
// All non alphanumeric characters are invalid.
if strings.ContainsAny(host, "`~!@#$%^&*()+={}[]|\\\"';:><?/") {
return false
}
// No need to regexp match, since the list is non-exhaustive.
// We let it valid and fail later.
return true
}
// IsValidIP parses input string for ip address validity.
func IsValidIP(ip string) bool {
return net.ParseIP(ip) != nil
}
// IsVirtualHostSupported - verifies if bucketName can be part of
// virtual host. Currently only Amazon S3 and Google Cloud Storage
// would support this.
func IsVirtualHostSupported(endpointURL url.URL, bucketName string) bool {
if endpointURL == sentinelURL {
return false
}
// bucketName can be valid but '.' in the hostname will fail SSL
// certificate validation. So do not use host-style for such buckets.
if endpointURL.Scheme == "https" && strings.Contains(bucketName, ".") {
return false
}
// Return true for all other cases
return IsAmazonEndpoint(endpointURL) || IsGoogleEndpoint(endpointURL) || IsAliyunOSSEndpoint(endpointURL)
}
// Refer for region styles - https://docs.aws.amazon.com/general/latest/gr/rande.html#s3_region
// amazonS3HostHyphen - regular expression used to determine if an arg is s3 host in hyphenated style.
var amazonS3HostHyphen = regexp.MustCompile(`^s3-(.*?).amazonaws.com$`)
// amazonS3HostDualStack - regular expression used to determine if an arg is s3 host dualstack.
var amazonS3HostDualStack = regexp.MustCompile(`^s3.dualstack.(.*?).amazonaws.com$`)
// amazonS3HostDot - regular expression used to determine if an arg is s3 host in . style.
var amazonS3HostDot = regexp.MustCompile(`^s3.(.*?).amazonaws.com$`)
// amazonS3ChinaHost - regular expression used to determine if the arg is s3 china host.
var amazonS3ChinaHost = regexp.MustCompile(`^s3.(cn.*?).amazonaws.com.cn$`)
// Regular expression used to determine if the arg is elb host.
var elbAmazonRegex = regexp.MustCompile(`elb(.*?).amazonaws.com$`)
// Regular expression used to determine if the arg is elb host in china.
var elbAmazonCnRegex = regexp.MustCompile(`elb(.*?).amazonaws.com.cn$`)
// GetRegionFromURL - returns a region from url host.
func GetRegionFromURL(endpointURL url.URL) string {
if endpointURL == sentinelURL {
return ""
}
if endpointURL.Host == "s3-external-1.amazonaws.com" {
return ""
}
if IsAmazonGovCloudEndpoint(endpointURL) {
return "us-gov-west-1"
}
// if elb's are used we cannot calculate which region it may be, just return empty.
if elbAmazonRegex.MatchString(endpointURL.Host) || elbAmazonCnRegex.MatchString(endpointURL.Host) {
return ""
}
parts := amazonS3HostDualStack.FindStringSubmatch(endpointURL.Host)
if len(parts) > 1 {
return parts[1]
}
parts = amazonS3HostHyphen.FindStringSubmatch(endpointURL.Host)
if len(parts) > 1 {
return parts[1]
}
parts = amazonS3ChinaHost.FindStringSubmatch(endpointURL.Host)
if len(parts) > 1 {
return parts[1]
}
parts = amazonS3HostDot.FindStringSubmatch(endpointURL.Host)
if len(parts) > 1 {
return parts[1]
}
return ""
}
// IsAliyunOSSEndpoint - Match if it is exactly Aliyun OSS endpoint.
func IsAliyunOSSEndpoint(endpointURL url.URL) bool {
return strings.HasSuffix(endpointURL.Host, "aliyuncs.com")
}
// IsAmazonEndpoint - Match if it is exactly Amazon S3 endpoint.
func IsAmazonEndpoint(endpointURL url.URL) bool {
if endpointURL.Host == "s3-external-1.amazonaws.com" || endpointURL.Host == "s3.amazonaws.com" {
return true
}
return GetRegionFromURL(endpointURL) != ""
}
// IsAmazonGovCloudEndpoint - Match if it is exactly Amazon S3 GovCloud endpoint.
func IsAmazonGovCloudEndpoint(endpointURL url.URL) bool {
if endpointURL == sentinelURL {
return false
}
return (endpointURL.Host == "s3-us-gov-west-1.amazonaws.com" ||
IsAmazonFIPSGovCloudEndpoint(endpointURL))
}
// IsAmazonFIPSGovCloudEndpoint - Match if it is exactly Amazon S3 FIPS GovCloud endpoint.
// See https://aws.amazon.com/compliance/fips.
func IsAmazonFIPSGovCloudEndpoint(endpointURL url.URL) bool {
if endpointURL == sentinelURL {
return false
}
return endpointURL.Host == "s3-fips-us-gov-west-1.amazonaws.com" ||
endpointURL.Host == "s3-fips.dualstack.us-gov-west-1.amazonaws.com"
}
// IsAmazonFIPSUSEastWestEndpoint - Match if it is exactly Amazon S3 FIPS US East/West endpoint.
// See https://aws.amazon.com/compliance/fips.
func IsAmazonFIPSUSEastWestEndpoint(endpointURL url.URL) bool {
if endpointURL == sentinelURL {
return false
}
switch endpointURL.Host {
case "s3-fips.us-east-2.amazonaws.com":
case "s3-fips.dualstack.us-west-1.amazonaws.com":
case "s3-fips.dualstack.us-west-2.amazonaws.com":
case "s3-fips.dualstack.us-east-2.amazonaws.com":
case "s3-fips.dualstack.us-east-1.amazonaws.com":
case "s3-fips.us-west-1.amazonaws.com":
case "s3-fips.us-west-2.amazonaws.com":
case "s3-fips.us-east-1.amazonaws.com":
default:
return false
}
return true
}
// IsAmazonFIPSEndpoint - Match if it is exactly Amazon S3 FIPS endpoint.
// See https://aws.amazon.com/compliance/fips.
func IsAmazonFIPSEndpoint(endpointURL url.URL) bool {
return IsAmazonFIPSUSEastWestEndpoint(endpointURL) || IsAmazonFIPSGovCloudEndpoint(endpointURL)
}
// IsGoogleEndpoint - Match if it is exactly Google cloud storage endpoint.
func IsGoogleEndpoint(endpointURL url.URL) bool {
if endpointURL == sentinelURL {
return false
}
return endpointURL.Host == "storage.googleapis.com"
}
// Expects ascii encoded strings - from output of urlEncodePath
func percentEncodeSlash(s string) string {
return strings.Replace(s, "/", "%2F", -1)
}
// QueryEncode - encodes query values in their URL encoded form. In
// addition to the percent encoding performed by urlEncodePath() used
// here, it also percent encodes '/' (forward slash)
func QueryEncode(v url.Values) string {
if v == nil {
return ""
}
var buf bytes.Buffer
keys := make([]string, 0, len(v))
for k := range v {
keys = append(keys, k)
}
sort.Strings(keys)
for _, k := range keys {
vs := v[k]
prefix := percentEncodeSlash(EncodePath(k)) + "="
for _, v := range vs {
if buf.Len() > 0 {
buf.WriteByte('&')
}
buf.WriteString(prefix)
buf.WriteString(percentEncodeSlash(EncodePath(v)))
}
}
return buf.String()
}
// TagDecode - decodes canonical tag into map of key and value.
func TagDecode(ctag string) map[string]string {
if ctag == "" {
return map[string]string{}
}
tags := strings.Split(ctag, "&")
tagMap := make(map[string]string, len(tags))
var err error
for _, tag := range tags {
kvs := strings.SplitN(tag, "=", 2)
if len(kvs) == 0 {
return map[string]string{}
}
if len(kvs) == 1 {
return map[string]string{}
}
tagMap[kvs[0]], err = url.PathUnescape(kvs[1])
if err != nil {
continue
}
}
return tagMap
}
// TagEncode - encodes tag values in their URL encoded form. In
// addition to the percent encoding performed by urlEncodePath() used
// here, it also percent encodes '/' (forward slash)
func TagEncode(tags map[string]string) string {
if tags == nil {
return ""
}
values := url.Values{}
for k, v := range tags {
values[k] = []string{v}
}
return QueryEncode(values)
}
// if object matches reserved string, no need to encode them
var reservedObjectNames = regexp.MustCompile("^[a-zA-Z0-9-_.~/]+$")
// EncodePath encode the strings from UTF-8 byte representations to HTML hex escape sequences
//
// This is necessary since regular url.Parse() and url.Encode() functions do not support UTF-8
// non english characters cannot be parsed due to the nature in which url.Encode() is written
//
// This function on the other hand is a direct replacement for url.Encode() technique to support
// pretty much every UTF-8 character.
func EncodePath(pathName string) string {
if reservedObjectNames.MatchString(pathName) {
return pathName
}
var encodedPathname strings.Builder
for _, s := range pathName {
if 'A' <= s && s <= 'Z' || 'a' <= s && s <= 'z' || '0' <= s && s <= '9' { // §2.3 Unreserved characters (mark)
encodedPathname.WriteRune(s)
continue
}
switch s {
case '-', '_', '.', '~', '/': // §2.3 Unreserved characters (mark)
encodedPathname.WriteRune(s)
continue
default:
len := utf8.RuneLen(s)
if len < 0 {
// if utf8 cannot convert return the same string as is
return pathName
}
u := make([]byte, len)
utf8.EncodeRune(u, s)
for _, r := range u {
hex := hex.EncodeToString([]byte{r})
encodedPathname.WriteString("%" + strings.ToUpper(hex))
}
}
}
return encodedPathname.String()
}
// We support '.' with bucket names but we fallback to using path
// style requests instead for such buckets.
var (
validBucketName = regexp.MustCompile(`^[A-Za-z0-9][A-Za-z0-9\.\-\_\:]{1,61}[A-Za-z0-9]$`)
validBucketNameStrict = regexp.MustCompile(`^[a-z0-9][a-z0-9\.\-]{1,61}[a-z0-9]$`)
ipAddress = regexp.MustCompile(`^(\d+\.){3}\d+$`)
)
// Common checker for both stricter and basic validation.
func checkBucketNameCommon(bucketName string, strict bool) (err error) {
if strings.TrimSpace(bucketName) == "" {
return errors.New("Bucket name cannot be empty")
}
if len(bucketName) < 3 {
return errors.New("Bucket name cannot be shorter than 3 characters")
}
if len(bucketName) > 63 {
return errors.New("Bucket name cannot be longer than 63 characters")
}
if ipAddress.MatchString(bucketName) {
return errors.New("Bucket name cannot be an ip address")
}
if strings.Contains(bucketName, "..") || strings.Contains(bucketName, ".-") || strings.Contains(bucketName, "-.") {
return errors.New("Bucket name contains invalid characters")
}
if strict {
if !validBucketNameStrict.MatchString(bucketName) {
err = errors.New("Bucket name contains invalid characters")
}
return err
}
if !validBucketName.MatchString(bucketName) {
err = errors.New("Bucket name contains invalid characters")
}
return err
}
// CheckValidBucketName - checks if we have a valid input bucket name.
func CheckValidBucketName(bucketName string) (err error) {
return checkBucketNameCommon(bucketName, false)
}
// CheckValidBucketNameStrict - checks if we have a valid input bucket name.
// This is a stricter version.
// - http://docs.aws.amazon.com/AmazonS3/latest/dev/UsingBucket.html
func CheckValidBucketNameStrict(bucketName string) (err error) {
return checkBucketNameCommon(bucketName, true)
}
// CheckValidObjectNamePrefix - checks if we have a valid input object name prefix.
// - http://docs.aws.amazon.com/AmazonS3/latest/dev/UsingMetadata.html
func CheckValidObjectNamePrefix(objectName string) error {
if len(objectName) > 1024 {
return errors.New("Object name cannot be longer than 1024 characters")
}
if !utf8.ValidString(objectName) {
return errors.New("Object name with non UTF-8 strings are not supported")
}
return nil
}
// CheckValidObjectName - checks if we have a valid input object name.
// - http://docs.aws.amazon.com/AmazonS3/latest/dev/UsingMetadata.html
func CheckValidObjectName(objectName string) error {
if strings.TrimSpace(objectName) == "" {
return errors.New("Object name cannot be empty")
}
return CheckValidObjectNamePrefix(objectName)
}