Update vendor

1 files changed, 391 insertions, 0 deletions

diff --git a/vendor/github.com/minio/minio-go/v7/pkg/s3utils/utils.go b/vendor/github.com/minio/minio-go/v7/pkg/s3utils/utils.go
new file mode 100644
index 00000000..fea25d6e
--- /dev/null
+++ b/vendor/github.com/minio/minio-go/v7/pkg/s3utils/utils.go
@@ -0,0 +1,391 @@
+/*
+ * 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$`)
+
+// amazonS3ChinaHostDualStack - regular expression used to determine if the arg is s3 china host dualstack.
+var amazonS3ChinaHostDualStack = regexp.MustCompile(`^s3.dualstack.(cn.*?).amazonaws.com.cn$`)
+
+// 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 = amazonS3ChinaHostDualStack.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)
+}