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gitea/vendor/github.com/minio/minio-go/v7/utils.go

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Go

/*
* MinIO Go Library for Amazon S3 Compatible Cloud Storage
* Copyright 2015-2017 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 minio
import (
"crypto/md5"
"encoding/base64"
"encoding/hex"
"encoding/xml"
"fmt"
"hash"
"io"
"io/ioutil"
"net"
"net/http"
"net/url"
"regexp"
"strconv"
"strings"
"sync"
"time"
md5simd "github.com/minio/md5-simd"
"github.com/minio/minio-go/v7/pkg/s3utils"
"github.com/minio/sha256-simd"
)
func trimEtag(etag string) string {
etag = strings.TrimPrefix(etag, "\"")
return strings.TrimSuffix(etag, "\"")
}
var expirationRegex = regexp.MustCompile(`expiry-date="(.*?)", rule-id="(.*?)"`)
func amzExpirationToExpiryDateRuleID(expiration string) (time.Time, string) {
if matches := expirationRegex.FindStringSubmatch(expiration); len(matches) == 3 {
expTime, err := time.Parse(http.TimeFormat, matches[1])
if err != nil {
return time.Time{}, ""
}
return expTime, matches[2]
}
return time.Time{}, ""
}
// xmlDecoder provide decoded value in xml.
func xmlDecoder(body io.Reader, v interface{}) error {
d := xml.NewDecoder(body)
return d.Decode(v)
}
// sum256 calculate sha256sum for an input byte array, returns hex encoded.
func sum256Hex(data []byte) string {
hash := newSHA256Hasher()
defer hash.Close()
hash.Write(data)
return hex.EncodeToString(hash.Sum(nil))
}
// sumMD5Base64 calculate md5sum for an input byte array, returns base64 encoded.
func sumMD5Base64(data []byte) string {
hash := newMd5Hasher()
defer hash.Close()
hash.Write(data)
return base64.StdEncoding.EncodeToString(hash.Sum(nil))
}
// getEndpointURL - construct a new endpoint.
func getEndpointURL(endpoint string, secure bool) (*url.URL, error) {
if strings.Contains(endpoint, ":") {
host, _, err := net.SplitHostPort(endpoint)
if err != nil {
return nil, err
}
if !s3utils.IsValidIP(host) && !s3utils.IsValidDomain(host) {
msg := "Endpoint: " + endpoint + " does not follow ip address or domain name standards."
return nil, errInvalidArgument(msg)
}
} else {
if !s3utils.IsValidIP(endpoint) && !s3utils.IsValidDomain(endpoint) {
msg := "Endpoint: " + endpoint + " does not follow ip address or domain name standards."
return nil, errInvalidArgument(msg)
}
}
// If secure is false, use 'http' scheme.
scheme := "https"
if !secure {
scheme = "http"
}
// Construct a secured endpoint URL.
endpointURLStr := scheme + "://" + endpoint
endpointURL, err := url.Parse(endpointURLStr)
if err != nil {
return nil, err
}
// Validate incoming endpoint URL.
if err := isValidEndpointURL(*endpointURL); err != nil {
return nil, err
}
return endpointURL, nil
}
// closeResponse close non nil response with any response Body.
// convenient wrapper to drain any remaining data on response body.
//
// Subsequently this allows golang http RoundTripper
// to re-use the same connection for future requests.
func closeResponse(resp *http.Response) {
// Callers should close resp.Body when done reading from it.
// If resp.Body is not closed, the Client's underlying RoundTripper
// (typically Transport) may not be able to re-use a persistent TCP
// connection to the server for a subsequent "keep-alive" request.
if resp != nil && resp.Body != nil {
// Drain any remaining Body and then close the connection.
// Without this closing connection would disallow re-using
// the same connection for future uses.
// - http://stackoverflow.com/a/17961593/4465767
io.Copy(ioutil.Discard, resp.Body)
resp.Body.Close()
}
}
var (
// Hex encoded string of nil sha256sum bytes.
emptySHA256Hex = "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"
// Sentinel URL is the default url value which is invalid.
sentinelURL = url.URL{}
)
// Verify if input endpoint URL is valid.
func isValidEndpointURL(endpointURL url.URL) error {
if endpointURL == sentinelURL {
return errInvalidArgument("Endpoint url cannot be empty.")
}
if endpointURL.Path != "/" && endpointURL.Path != "" {
return errInvalidArgument("Endpoint url cannot have fully qualified paths.")
}
if strings.Contains(endpointURL.Host, ".s3.amazonaws.com") {
if !s3utils.IsAmazonEndpoint(endpointURL) {
return errInvalidArgument("Amazon S3 endpoint should be 's3.amazonaws.com'.")
}
}
if strings.Contains(endpointURL.Host, ".googleapis.com") {
if !s3utils.IsGoogleEndpoint(endpointURL) {
return errInvalidArgument("Google Cloud Storage endpoint should be 'storage.googleapis.com'.")
}
}
return nil
}
// Verify if input expires value is valid.
func isValidExpiry(expires time.Duration) error {
expireSeconds := int64(expires / time.Second)
if expireSeconds < 1 {
return errInvalidArgument("Expires cannot be lesser than 1 second.")
}
if expireSeconds > 604800 {
return errInvalidArgument("Expires cannot be greater than 7 days.")
}
return nil
}
// Extract only necessary metadata header key/values by
// filtering them out with a list of custom header keys.
func extractObjMetadata(header http.Header) http.Header {
preserveKeys := []string{
"Content-Type",
"Cache-Control",
"Content-Encoding",
"Content-Language",
"Content-Disposition",
"X-Amz-Storage-Class",
"X-Amz-Object-Lock-Mode",
"X-Amz-Object-Lock-Retain-Until-Date",
"X-Amz-Object-Lock-Legal-Hold",
"X-Amz-Website-Redirect-Location",
"X-Amz-Server-Side-Encryption",
"X-Amz-Tagging-Count",
"X-Amz-Meta-",
// Add new headers to be preserved.
// if you add new headers here, please extend
// PutObjectOptions{} to preserve them
// upon upload as well.
}
filteredHeader := make(http.Header)
for k, v := range header {
var found bool
for _, prefix := range preserveKeys {
if !strings.HasPrefix(k, prefix) {
continue
}
found = true
break
}
if found {
filteredHeader[k] = v
}
}
return filteredHeader
}
// ToObjectInfo converts http header values into ObjectInfo type,
// extracts metadata and fills in all the necessary fields in ObjectInfo.
func ToObjectInfo(bucketName string, objectName string, h http.Header) (ObjectInfo, error) {
var err error
// Trim off the odd double quotes from ETag in the beginning and end.
etag := trimEtag(h.Get("ETag"))
// Parse content length is exists
var size int64 = -1
contentLengthStr := h.Get("Content-Length")
if contentLengthStr != "" {
size, err = strconv.ParseInt(contentLengthStr, 10, 64)
if err != nil {
// Content-Length is not valid
return ObjectInfo{}, ErrorResponse{
Code: "InternalError",
Message: fmt.Sprintf("Content-Length is not an integer, failed with %v", err),
BucketName: bucketName,
Key: objectName,
RequestID: h.Get("x-amz-request-id"),
HostID: h.Get("x-amz-id-2"),
Region: h.Get("x-amz-bucket-region"),
}
}
}
// Parse Last-Modified has http time format.
date, err := time.Parse(http.TimeFormat, h.Get("Last-Modified"))
if err != nil {
return ObjectInfo{}, ErrorResponse{
Code: "InternalError",
Message: fmt.Sprintf("Last-Modified time format is invalid, failed with %v", err),
BucketName: bucketName,
Key: objectName,
RequestID: h.Get("x-amz-request-id"),
HostID: h.Get("x-amz-id-2"),
Region: h.Get("x-amz-bucket-region"),
}
}
// Fetch content type if any present.
contentType := strings.TrimSpace(h.Get("Content-Type"))
if contentType == "" {
contentType = "application/octet-stream"
}
expiryStr := h.Get("Expires")
var expiry time.Time
if expiryStr != "" {
expiry, _ = time.Parse(http.TimeFormat, expiryStr)
}
metadata := extractObjMetadata(h)
userMetadata := make(map[string]string)
for k, v := range metadata {
if strings.HasPrefix(k, "X-Amz-Meta-") {
userMetadata[strings.TrimPrefix(k, "X-Amz-Meta-")] = v[0]
}
}
userTags := s3utils.TagDecode(h.Get(amzTaggingHeader))
var tagCount int
if count := h.Get(amzTaggingCount); count != "" {
tagCount, err = strconv.Atoi(count)
if err != nil {
return ObjectInfo{}, ErrorResponse{
Code: "InternalError",
Message: fmt.Sprintf("x-amz-tagging-count is not an integer, failed with %v", err),
BucketName: bucketName,
Key: objectName,
RequestID: h.Get("x-amz-request-id"),
HostID: h.Get("x-amz-id-2"),
Region: h.Get("x-amz-bucket-region"),
}
}
}
// extract lifecycle expiry date and rule ID
expTime, ruleID := amzExpirationToExpiryDateRuleID(h.Get(amzExpiration))
// Save object metadata info.
return ObjectInfo{
ETag: etag,
Key: objectName,
Size: size,
LastModified: date,
ContentType: contentType,
Expires: expiry,
VersionID: h.Get(amzVersionID),
ReplicationStatus: h.Get(amzReplicationStatus),
Expiration: expTime,
ExpirationRuleID: ruleID,
// Extract only the relevant header keys describing the object.
// following function filters out a list of standard set of keys
// which are not part of object metadata.
Metadata: metadata,
UserMetadata: userMetadata,
UserTags: userTags,
UserTagCount: tagCount,
}, nil
}
var readFull = func(r io.Reader, buf []byte) (n int, err error) {
// ReadFull reads exactly len(buf) bytes from r into buf.
// It returns the number of bytes copied and an error if
// fewer bytes were read. The error is EOF only if no bytes
// were read. If an EOF happens after reading some but not
// all the bytes, ReadFull returns ErrUnexpectedEOF.
// On return, n == len(buf) if and only if err == nil.
// If r returns an error having read at least len(buf) bytes,
// the error is dropped.
for n < len(buf) && err == nil {
var nn int
nn, err = r.Read(buf[n:])
// Some spurious io.Reader's return
// io.ErrUnexpectedEOF when nn == 0
// this behavior is undocumented
// so we are on purpose not using io.ReadFull
// implementation because this can lead
// to custom handling, to avoid that
// we simply modify the original io.ReadFull
// implementation to avoid this issue.
// io.ErrUnexpectedEOF with nn == 0 really
// means that io.EOF
if err == io.ErrUnexpectedEOF && nn == 0 {
err = io.EOF
}
n += nn
}
if n >= len(buf) {
err = nil
} else if n > 0 && err == io.EOF {
err = io.ErrUnexpectedEOF
}
return
}
// regCred matches credential string in HTTP header
var regCred = regexp.MustCompile("Credential=([A-Z0-9]+)/")
// regCred matches signature string in HTTP header
var regSign = regexp.MustCompile("Signature=([[0-9a-f]+)")
// Redact out signature value from authorization string.
func redactSignature(origAuth string) string {
if !strings.HasPrefix(origAuth, signV4Algorithm) {
// Set a temporary redacted auth
return "AWS **REDACTED**:**REDACTED**"
}
/// Signature V4 authorization header.
// Strip out accessKeyID from:
// Credential=<access-key-id>/<date>/<aws-region>/<aws-service>/aws4_request
newAuth := regCred.ReplaceAllString(origAuth, "Credential=**REDACTED**/")
// Strip out 256-bit signature from: Signature=<256-bit signature>
return regSign.ReplaceAllString(newAuth, "Signature=**REDACTED**")
}
// Get default location returns the location based on the input
// URL `u`, if region override is provided then all location
// defaults to regionOverride.
//
// If no other cases match then the location is set to `us-east-1`
// as a last resort.
func getDefaultLocation(u url.URL, regionOverride string) (location string) {
if regionOverride != "" {
return regionOverride
}
region := s3utils.GetRegionFromURL(u)
if region == "" {
region = "us-east-1"
}
return region
}
var supportedHeaders = []string{
"content-type",
"cache-control",
"content-encoding",
"content-disposition",
"content-language",
"x-amz-website-redirect-location",
"x-amz-object-lock-mode",
"x-amz-metadata-directive",
"x-amz-object-lock-retain-until-date",
"expires",
"x-amz-replication-status",
// Add more supported headers here.
}
// isStorageClassHeader returns true if the header is a supported storage class header
func isStorageClassHeader(headerKey string) bool {
return strings.EqualFold(amzStorageClass, headerKey)
}
// isStandardHeader returns true if header is a supported header and not a custom header
func isStandardHeader(headerKey string) bool {
key := strings.ToLower(headerKey)
for _, header := range supportedHeaders {
if strings.ToLower(header) == key {
return true
}
}
return false
}
// sseHeaders is list of server side encryption headers
var sseHeaders = []string{
"x-amz-server-side-encryption",
"x-amz-server-side-encryption-aws-kms-key-id",
"x-amz-server-side-encryption-context",
"x-amz-server-side-encryption-customer-algorithm",
"x-amz-server-side-encryption-customer-key",
"x-amz-server-side-encryption-customer-key-MD5",
}
// isSSEHeader returns true if header is a server side encryption header.
func isSSEHeader(headerKey string) bool {
key := strings.ToLower(headerKey)
for _, h := range sseHeaders {
if strings.ToLower(h) == key {
return true
}
}
return false
}
// isAmzHeader returns true if header is a x-amz-meta-* or x-amz-acl header.
func isAmzHeader(headerKey string) bool {
key := strings.ToLower(headerKey)
return strings.HasPrefix(key, "x-amz-meta-") || strings.HasPrefix(key, "x-amz-grant-") || key == "x-amz-acl" || isSSEHeader(headerKey)
}
var md5Pool = sync.Pool{New: func() interface{} { return md5.New() }}
var sha256Pool = sync.Pool{New: func() interface{} { return sha256.New() }}
func newMd5Hasher() md5simd.Hasher {
return hashWrapper{Hash: md5Pool.New().(hash.Hash), isMD5: true}
}
func newSHA256Hasher() md5simd.Hasher {
return hashWrapper{Hash: sha256Pool.New().(hash.Hash), isSHA256: true}
}
// hashWrapper implements the md5simd.Hasher interface.
type hashWrapper struct {
hash.Hash
isMD5 bool
isSHA256 bool
}
// Close will put the hasher back into the pool.
func (m hashWrapper) Close() {
if m.isMD5 && m.Hash != nil {
m.Reset()
md5Pool.Put(m.Hash)
}
if m.isSHA256 && m.Hash != nil {
m.Reset()
sha256Pool.Put(m.Hash)
}
m.Hash = nil
}