minio/cmd/api-headers.go
Harshavardhana cc46a99f97
skip object-lock headers without values (#14430)
metadata headers can have headers without values
as per AWS S3 spec however, we need to skip some
headers that do not have values that potentially
can have empty values set.
2022-03-01 11:04:47 -08:00

204 lines
6.0 KiB
Go

// Copyright (c) 2015-2021 MinIO, Inc.
//
// This file is part of MinIO Object Storage stack
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package cmd
import (
"bytes"
"encoding/json"
"encoding/xml"
"fmt"
"net/http"
"net/url"
"strconv"
"strings"
"time"
"github.com/minio/minio/internal/crypto"
xhttp "github.com/minio/minio/internal/http"
)
// Returns a hexadecimal representation of time at the
// time response is sent to the client.
func mustGetRequestID(t time.Time) string {
return fmt.Sprintf("%X", t.UnixNano())
}
// setEventStreamHeaders to allow proxies to avoid buffering proxy responses
func setEventStreamHeaders(w http.ResponseWriter) {
w.Header().Set(xhttp.ContentType, "text/event-stream")
w.Header().Set(xhttp.CacheControl, "no-cache") // nginx to turn off buffering
w.Header().Set("X-Accel-Buffering", "no") // nginx to turn off buffering
}
// Write http common headers
func setCommonHeaders(w http.ResponseWriter) {
// Set the "Server" http header.
w.Header().Set(xhttp.ServerInfo, "MinIO")
// Set `x-amz-bucket-region` only if region is set on the server
// by default minio uses an empty region.
if region := globalSite.Region; region != "" {
w.Header().Set(xhttp.AmzBucketRegion, region)
}
w.Header().Set(xhttp.AcceptRanges, "bytes")
// Remove sensitive information
crypto.RemoveSensitiveHeaders(w.Header())
}
// Encodes the response headers into XML format.
func encodeResponse(response interface{}) []byte {
var bytesBuffer bytes.Buffer
bytesBuffer.WriteString(xml.Header)
e := xml.NewEncoder(&bytesBuffer)
e.Encode(response)
return bytesBuffer.Bytes()
}
// Encodes the response headers into JSON format.
func encodeResponseJSON(response interface{}) []byte {
var bytesBuffer bytes.Buffer
e := json.NewEncoder(&bytesBuffer)
e.Encode(response)
return bytesBuffer.Bytes()
}
// Write parts count
func setPartsCountHeaders(w http.ResponseWriter, objInfo ObjectInfo) {
if strings.Contains(objInfo.ETag, "-") && len(objInfo.Parts) > 0 {
w.Header()[xhttp.AmzMpPartsCount] = []string{strconv.Itoa(len(objInfo.Parts))}
}
}
// Write object header
func setObjectHeaders(w http.ResponseWriter, objInfo ObjectInfo, rs *HTTPRangeSpec, opts ObjectOptions) (err error) {
// set common headers
setCommonHeaders(w)
// Set last modified time.
lastModified := objInfo.ModTime.UTC().Format(http.TimeFormat)
w.Header().Set(xhttp.LastModified, lastModified)
// Set Etag if available.
if objInfo.ETag != "" {
w.Header()[xhttp.ETag] = []string{"\"" + objInfo.ETag + "\""}
}
if objInfo.ContentType != "" {
w.Header().Set(xhttp.ContentType, objInfo.ContentType)
}
if objInfo.ContentEncoding != "" {
w.Header().Set(xhttp.ContentEncoding, objInfo.ContentEncoding)
}
if !objInfo.Expires.IsZero() {
w.Header().Set(xhttp.Expires, objInfo.Expires.UTC().Format(http.TimeFormat))
}
if globalCacheConfig.Enabled {
w.Header().Set(xhttp.XCache, objInfo.CacheStatus.String())
w.Header().Set(xhttp.XCacheLookup, objInfo.CacheLookupStatus.String())
}
// Set tag count if object has tags
if len(objInfo.UserTags) > 0 {
tags, _ := url.ParseQuery(objInfo.UserTags)
if len(tags) > 0 {
w.Header()[xhttp.AmzTagCount] = []string{strconv.Itoa(len(tags))}
}
}
// Set all other user defined metadata.
for k, v := range objInfo.UserDefined {
// Empty values for object lock and retention can be skipped.
if v == "" && equals(k, xhttp.AmzObjectLockMode, xhttp.AmzObjectLockRetainUntilDate) {
continue
}
if strings.HasPrefix(strings.ToLower(k), ReservedMetadataPrefixLower) {
// Do not need to send any internal metadata
// values to client.
continue
}
// https://github.com/google/security-research/security/advisories/GHSA-76wf-9vgp-pj7w
if equals(k, xhttp.AmzMetaUnencryptedContentLength, xhttp.AmzMetaUnencryptedContentMD5) {
continue
}
var isSet bool
for _, userMetadataPrefix := range userMetadataKeyPrefixes {
if !strings.HasPrefix(strings.ToLower(k), strings.ToLower(userMetadataPrefix)) {
continue
}
w.Header()[strings.ToLower(k)] = []string{v}
isSet = true
break
}
if !isSet {
w.Header().Set(k, v)
}
}
var start, rangeLen int64
totalObjectSize, err := objInfo.GetActualSize()
if err != nil {
return err
}
if rs == nil && opts.PartNumber > 0 {
rs = partNumberToRangeSpec(objInfo, opts.PartNumber)
}
// For providing ranged content
start, rangeLen, err = rs.GetOffsetLength(totalObjectSize)
if err != nil {
return err
}
// Set content length.
w.Header().Set(xhttp.ContentLength, strconv.FormatInt(rangeLen, 10))
if rs != nil {
contentRange := fmt.Sprintf("bytes %d-%d/%d", start, start+rangeLen-1, totalObjectSize)
w.Header().Set(xhttp.ContentRange, contentRange)
}
// Set the relevant version ID as part of the response header.
if objInfo.VersionID != "" {
w.Header()[xhttp.AmzVersionID] = []string{objInfo.VersionID}
}
if objInfo.ReplicationStatus.String() != "" {
w.Header()[xhttp.AmzBucketReplicationStatus] = []string{objInfo.ReplicationStatus.String()}
}
if objInfo.IsRemote() {
// Check if object is being restored. For more information on x-amz-restore header see
// https://docs.aws.amazon.com/AmazonS3/latest/API/API_HeadObject.html#API_HeadObject_ResponseSyntax
w.Header()[xhttp.AmzStorageClass] = []string{objInfo.TransitionedObject.Tier}
}
if lc, err := globalLifecycleSys.Get(objInfo.Bucket); err == nil {
lc.SetPredictionHeaders(w, objInfo.ToLifecycleOpts())
}
return nil
}