mirror of
https://github.com/minio/minio.git
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232 lines
6.9 KiB
Go
232 lines
6.9 KiB
Go
// Copyright (c) 2015-2021 MinIO, Inc.
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//
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// This file is part of MinIO Object Storage stack
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package cmd
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import (
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"bytes"
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"encoding/json"
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"encoding/xml"
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"fmt"
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"net/http"
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"strconv"
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"strings"
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"time"
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"github.com/minio/minio-go/v7/pkg/tags"
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"github.com/minio/minio/internal/crypto"
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xhttp "github.com/minio/minio/internal/http"
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"github.com/minio/minio/internal/logger"
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xxml "github.com/minio/xxml"
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)
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// Returns a hexadecimal representation of time at the
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// time response is sent to the client.
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func mustGetRequestID(t time.Time) string {
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return fmt.Sprintf("%X", t.UnixNano())
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}
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// setEventStreamHeaders to allow proxies to avoid buffering proxy responses
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func setEventStreamHeaders(w http.ResponseWriter) {
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w.Header().Set(xhttp.ContentType, "text/event-stream")
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w.Header().Set(xhttp.CacheControl, "no-cache") // nginx to turn off buffering
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w.Header().Set("X-Accel-Buffering", "no") // nginx to turn off buffering
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}
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// Write http common headers
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func setCommonHeaders(w http.ResponseWriter) {
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// Set the "Server" http header.
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w.Header().Set(xhttp.ServerInfo, "MinIO")
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// Set `x-amz-bucket-region` only if region is set on the server
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// by default minio uses an empty region.
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if region := globalSite.Region; region != "" {
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w.Header().Set(xhttp.AmzBucketRegion, region)
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}
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w.Header().Set(xhttp.AcceptRanges, "bytes")
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// Remove sensitive information
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crypto.RemoveSensitiveHeaders(w.Header())
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}
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// Encodes the response headers into XML format.
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func encodeResponse(response interface{}) []byte {
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var buf bytes.Buffer
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buf.WriteString(xml.Header)
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if err := xml.NewEncoder(&buf).Encode(response); err != nil {
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logger.LogIf(GlobalContext, err)
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return nil
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}
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return buf.Bytes()
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}
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// Use this encodeResponseList() to support control characters
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// this function must be used by only ListObjects() for objects
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// with control characters, this is a specialized extension
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// to support AWS S3 compatible behavior.
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//
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// Do not use this function for anything other than ListObjects()
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// variants, please open a github discussion if you wish to use
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// this in other places.
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func encodeResponseList(response interface{}) []byte {
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var buf bytes.Buffer
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buf.WriteString(xxml.Header)
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if err := xxml.NewEncoder(&buf).Encode(response); err != nil {
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logger.LogIf(GlobalContext, err)
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return nil
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}
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return buf.Bytes()
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}
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// Encodes the response headers into JSON format.
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func encodeResponseJSON(response interface{}) []byte {
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var bytesBuffer bytes.Buffer
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e := json.NewEncoder(&bytesBuffer)
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e.Encode(response)
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return bytesBuffer.Bytes()
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}
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// Write parts count
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func setPartsCountHeaders(w http.ResponseWriter, objInfo ObjectInfo) {
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if strings.Contains(objInfo.ETag, "-") && len(objInfo.Parts) > 0 {
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w.Header()[xhttp.AmzMpPartsCount] = []string{strconv.Itoa(len(objInfo.Parts))}
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}
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}
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// Write object header
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func setObjectHeaders(w http.ResponseWriter, objInfo ObjectInfo, rs *HTTPRangeSpec, opts ObjectOptions) (err error) {
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// set common headers
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setCommonHeaders(w)
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// Set last modified time.
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lastModified := objInfo.ModTime.UTC().Format(http.TimeFormat)
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w.Header().Set(xhttp.LastModified, lastModified)
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// Set Etag if available.
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if objInfo.ETag != "" {
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w.Header()[xhttp.ETag] = []string{"\"" + objInfo.ETag + "\""}
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}
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if objInfo.ContentType != "" {
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w.Header().Set(xhttp.ContentType, objInfo.ContentType)
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}
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if objInfo.ContentEncoding != "" {
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w.Header().Set(xhttp.ContentEncoding, objInfo.ContentEncoding)
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}
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if !objInfo.Expires.IsZero() {
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w.Header().Set(xhttp.Expires, objInfo.Expires.UTC().Format(http.TimeFormat))
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}
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// Set tag count if object has tags
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if len(objInfo.UserTags) > 0 {
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tags, _ := tags.ParseObjectTags(objInfo.UserTags)
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if tags.Count() > 0 {
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w.Header()[xhttp.AmzTagCount] = []string{strconv.Itoa(tags.Count())}
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if opts.Tagging {
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// This is MinIO only extension to return back tags along with the count.
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w.Header()[xhttp.AmzObjectTagging] = []string{objInfo.UserTags}
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}
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}
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}
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// Set all other user defined metadata.
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for k, v := range objInfo.UserDefined {
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// Empty values for object lock and retention can be skipped.
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if v == "" && equals(k, xhttp.AmzObjectLockMode, xhttp.AmzObjectLockRetainUntilDate) {
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continue
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}
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if stringsHasPrefixFold(k, ReservedMetadataPrefixLower) {
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// Do not need to send any internal metadata
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// values to client.
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continue
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}
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// https://github.com/google/security-research/security/advisories/GHSA-76wf-9vgp-pj7w
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if equals(k, xhttp.AmzMetaUnencryptedContentLength, xhttp.AmzMetaUnencryptedContentMD5) {
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continue
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}
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var isSet bool
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for _, userMetadataPrefix := range userMetadataKeyPrefixes {
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if !stringsHasPrefixFold(k, userMetadataPrefix) {
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continue
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}
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w.Header()[strings.ToLower(k)] = []string{v}
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isSet = true
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break
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}
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if !isSet {
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w.Header().Set(k, v)
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}
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}
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var start, rangeLen int64
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totalObjectSize, err := objInfo.GetActualSize()
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if err != nil {
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return err
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}
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if rs == nil && opts.PartNumber > 0 {
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rs = partNumberToRangeSpec(objInfo, opts.PartNumber)
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}
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// For providing ranged content
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start, rangeLen, err = rs.GetOffsetLength(totalObjectSize)
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if err != nil {
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return err
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}
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// Set content length.
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w.Header().Set(xhttp.ContentLength, strconv.FormatInt(rangeLen, 10))
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if rs != nil {
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contentRange := fmt.Sprintf("bytes %d-%d/%d", start, start+rangeLen-1, totalObjectSize)
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w.Header().Set(xhttp.ContentRange, contentRange)
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}
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// Set the relevant version ID as part of the response header.
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if objInfo.VersionID != "" && objInfo.VersionID != nullVersionID {
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w.Header()[xhttp.AmzVersionID] = []string{objInfo.VersionID}
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}
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if objInfo.ReplicationStatus.String() != "" {
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w.Header()[xhttp.AmzBucketReplicationStatus] = []string{objInfo.ReplicationStatus.String()}
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}
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if objInfo.IsRemote() {
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// Check if object is being restored. For more information on x-amz-restore header see
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// https://docs.aws.amazon.com/AmazonS3/latest/API/API_HeadObject.html#API_HeadObject_ResponseSyntax
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w.Header()[xhttp.AmzStorageClass] = []string{objInfo.TransitionedObject.Tier}
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}
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if lc, err := globalLifecycleSys.Get(objInfo.Bucket); err == nil {
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lc.SetPredictionHeaders(w, objInfo.ToLifecycleOpts())
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}
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if v, ok := objInfo.UserDefined[ReservedMetadataPrefix+"compression"]; ok {
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if i := strings.LastIndexByte(v, '/'); i >= 0 {
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v = v[i+1:]
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}
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w.Header()[xhttp.MinIOCompressed] = []string{v}
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}
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return nil
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}
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