minio/cmd/object-handlers-common.go

382 lines
14 KiB
Go

// Copyright (c) 2015-2023 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 (
"context"
"net/http"
"regexp"
"strconv"
"time"
"github.com/minio/minio/internal/amztime"
"github.com/minio/minio/internal/event"
"github.com/minio/minio/internal/hash"
xhttp "github.com/minio/minio/internal/http"
"github.com/minio/minio/internal/logger"
)
var etagRegex = regexp.MustCompile("\"*?([^\"]*?)\"*?$")
// Validates the preconditions for CopyObjectPart, returns true if CopyObjectPart
// operation should not proceed. Preconditions supported are:
//
// x-amz-copy-source-if-modified-since
// x-amz-copy-source-if-unmodified-since
// x-amz-copy-source-if-match
// x-amz-copy-source-if-none-match
func checkCopyObjectPartPreconditions(ctx context.Context, w http.ResponseWriter, r *http.Request, objInfo ObjectInfo) bool {
return checkCopyObjectPreconditions(ctx, w, r, objInfo)
}
// Validates the preconditions for CopyObject, returns true if CopyObject operation should not proceed.
// Preconditions supported are:
//
// x-amz-copy-source-if-modified-since
// x-amz-copy-source-if-unmodified-since
// x-amz-copy-source-if-match
// x-amz-copy-source-if-none-match
func checkCopyObjectPreconditions(ctx context.Context, w http.ResponseWriter, r *http.Request, objInfo ObjectInfo) bool {
// Return false for methods other than GET and HEAD.
if r.Method != http.MethodPut {
return false
}
// If the object doesn't have a modtime (IsZero), or the modtime
// is obviously garbage (Unix time == 0), then ignore modtimes
// and don't process the If-Modified-Since header.
if objInfo.ModTime.IsZero() || objInfo.ModTime.Equal(time.Unix(0, 0)) {
return false
}
// Headers to be set of object content is not going to be written to the client.
writeHeaders := func() {
// set common headers
setCommonHeaders(w)
// set object-related metadata headers
w.Header().Set(xhttp.LastModified, objInfo.ModTime.UTC().Format(http.TimeFormat))
if objInfo.ETag != "" {
w.Header()[xhttp.ETag] = []string{"\"" + objInfo.ETag + "\""}
}
}
// x-amz-copy-source-if-modified-since: Return the object only if it has been modified
// since the specified time otherwise return 412 (precondition failed).
ifModifiedSinceHeader := r.Header.Get(xhttp.AmzCopySourceIfModifiedSince)
if ifModifiedSinceHeader != "" {
if givenTime, err := amztime.ParseHeader(ifModifiedSinceHeader); err == nil {
if !ifModifiedSince(objInfo.ModTime, givenTime) {
// If the object is not modified since the specified time.
writeHeaders()
writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrPreconditionFailed), r.URL)
return true
}
}
}
// x-amz-copy-source-if-unmodified-since : Return the object only if it has not been
// modified since the specified time, otherwise return a 412 (precondition failed).
ifUnmodifiedSinceHeader := r.Header.Get(xhttp.AmzCopySourceIfUnmodifiedSince)
if ifUnmodifiedSinceHeader != "" {
if givenTime, err := amztime.ParseHeader(ifUnmodifiedSinceHeader); err == nil {
if ifModifiedSince(objInfo.ModTime, givenTime) {
// If the object is modified since the specified time.
writeHeaders()
writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrPreconditionFailed), r.URL)
return true
}
}
}
// x-amz-copy-source-if-match : Return the object only if its entity tag (ETag) is the
// same as the one specified; otherwise return a 412 (precondition failed).
ifMatchETagHeader := r.Header.Get(xhttp.AmzCopySourceIfMatch)
if ifMatchETagHeader != "" {
if !isETagEqual(objInfo.ETag, ifMatchETagHeader) {
// If the object ETag does not match with the specified ETag.
writeHeaders()
writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrPreconditionFailed), r.URL)
return true
}
}
// If-None-Match : Return the object only if its entity tag (ETag) is different from the
// one specified otherwise, return a 304 (not modified).
ifNoneMatchETagHeader := r.Header.Get(xhttp.AmzCopySourceIfNoneMatch)
if ifNoneMatchETagHeader != "" {
if isETagEqual(objInfo.ETag, ifNoneMatchETagHeader) {
// If the object ETag matches with the specified ETag.
writeHeaders()
writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrPreconditionFailed), r.URL)
return true
}
}
// Object content should be written to http.ResponseWriter
return false
}
// Validates the preconditions. Returns true if PUT operation should not proceed.
// Preconditions supported are:
//
// x-minio-source-mtime
// x-minio-source-etag
func checkPreconditionsPUT(ctx context.Context, w http.ResponseWriter, r *http.Request, objInfo ObjectInfo, opts ObjectOptions) bool {
// Return false for methods other than PUT.
if r.Method != http.MethodPut {
return false
}
// If the object doesn't have a modtime (IsZero), or the modtime
// is obviously garbage (Unix time == 0), then ignore modtimes
// and don't process the If-Modified-Since header.
if objInfo.ModTime.IsZero() || objInfo.ModTime.Equal(time.Unix(0, 0)) {
return false
}
// If top level is a delete marker proceed to upload.
if objInfo.DeleteMarker {
return false
}
// Headers to be set of object content is not going to be written to the client.
writeHeaders := func() {
// set common headers
setCommonHeaders(w)
// set object-related metadata headers
w.Header().Set(xhttp.LastModified, objInfo.ModTime.UTC().Format(http.TimeFormat))
if objInfo.ETag != "" {
w.Header()[xhttp.ETag] = []string{"\"" + objInfo.ETag + "\""}
}
}
// If-Match : Return the object only if its entity tag (ETag) is the same as the one specified;
// otherwise return a 412 (precondition failed).
ifMatchETagHeader := r.Header.Get(xhttp.IfMatch)
if ifMatchETagHeader != "" {
if !isETagEqual(objInfo.ETag, ifMatchETagHeader) {
// If the object ETag does not match with the specified ETag.
writeHeaders()
writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrPreconditionFailed), r.URL)
return true
}
}
// If-None-Match : Return the object only if its entity tag (ETag) is different from the
// one specified otherwise, return a 304 (not modified).
ifNoneMatchETagHeader := r.Header.Get(xhttp.IfNoneMatch)
if ifNoneMatchETagHeader != "" {
if isETagEqual(objInfo.ETag, ifNoneMatchETagHeader) {
// If the object ETag matches with the specified ETag.
writeHeaders()
w.WriteHeader(http.StatusNotModified)
return true
}
}
etagMatch := opts.PreserveETag != "" && isETagEqual(objInfo.ETag, opts.PreserveETag)
vidMatch := opts.VersionID != "" && opts.VersionID == objInfo.VersionID
mtimeMatch := !opts.MTime.IsZero() && objInfo.ModTime.Unix() >= opts.MTime.Unix()
if etagMatch && vidMatch && mtimeMatch {
writeHeaders()
writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrPreconditionFailed), r.URL)
return true
}
// Object content should be persisted.
return false
}
// Validates the preconditions. Returns true if GET/HEAD operation should not proceed.
// Preconditions supported are:
//
// If-Modified-Since
// If-Unmodified-Since
// If-Match
// If-None-Match
func checkPreconditions(ctx context.Context, w http.ResponseWriter, r *http.Request, objInfo ObjectInfo, opts ObjectOptions) bool {
// Return false for methods other than GET and HEAD.
if r.Method != http.MethodGet && r.Method != http.MethodHead {
return false
}
// If the object doesn't have a modtime (IsZero), or the modtime
// is obviously garbage (Unix time == 0), then ignore modtimes
// and don't process the If-Modified-Since header.
if objInfo.ModTime.IsZero() || objInfo.ModTime.Equal(time.Unix(0, 0)) {
return false
}
// Headers to be set of object content is not going to be written to the client.
writeHeaders := func() {
// set common headers
setCommonHeaders(w)
// set object-related metadata headers
w.Header().Set(xhttp.LastModified, objInfo.ModTime.UTC().Format(http.TimeFormat))
if objInfo.ETag != "" {
w.Header()[xhttp.ETag] = []string{"\"" + objInfo.ETag + "\""}
}
}
// Check if the part number is correct.
if opts.PartNumber > 1 && opts.PartNumber > len(objInfo.Parts) {
// According to S3 we don't need to set any object information here.
writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrInvalidPartNumber), r.URL)
return true
}
// If-Modified-Since : Return the object only if it has been modified since the specified time,
// otherwise return a 304 (not modified).
ifModifiedSinceHeader := r.Header.Get(xhttp.IfModifiedSince)
if ifModifiedSinceHeader != "" {
if givenTime, err := amztime.ParseHeader(ifModifiedSinceHeader); err == nil {
if !ifModifiedSince(objInfo.ModTime, givenTime) {
// If the object is not modified since the specified time.
writeHeaders()
w.WriteHeader(http.StatusNotModified)
return true
}
}
}
// If-Unmodified-Since : Return the object only if it has not been modified since the specified
// time, otherwise return a 412 (precondition failed).
ifUnmodifiedSinceHeader := r.Header.Get(xhttp.IfUnmodifiedSince)
if ifUnmodifiedSinceHeader != "" {
if givenTime, err := amztime.ParseHeader(ifUnmodifiedSinceHeader); err == nil {
if ifModifiedSince(objInfo.ModTime, givenTime) {
// If the object is modified since the specified time.
writeHeaders()
writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrPreconditionFailed), r.URL)
return true
}
}
}
// If-Match : Return the object only if its entity tag (ETag) is the same as the one specified;
// otherwise return a 412 (precondition failed).
ifMatchETagHeader := r.Header.Get(xhttp.IfMatch)
if ifMatchETagHeader != "" {
if !isETagEqual(objInfo.ETag, ifMatchETagHeader) {
// If the object ETag does not match with the specified ETag.
writeHeaders()
writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrPreconditionFailed), r.URL)
return true
}
}
// If-None-Match : Return the object only if its entity tag (ETag) is different from the
// one specified otherwise, return a 304 (not modified).
ifNoneMatchETagHeader := r.Header.Get(xhttp.IfNoneMatch)
if ifNoneMatchETagHeader != "" {
if isETagEqual(objInfo.ETag, ifNoneMatchETagHeader) {
// If the object ETag matches with the specified ETag.
writeHeaders()
w.WriteHeader(http.StatusNotModified)
return true
}
}
// Object content should be written to http.ResponseWriter
return false
}
// returns true if object was modified after givenTime.
func ifModifiedSince(objTime time.Time, givenTime time.Time) bool {
// The Date-Modified header truncates sub-second precision, so
// use mtime < t+1s instead of mtime <= t to check for unmodified.
return objTime.After(givenTime.Add(1 * time.Second))
}
// canonicalizeETag returns ETag with leading and trailing double-quotes removed,
// if any present
func canonicalizeETag(etag string) string {
return etagRegex.ReplaceAllString(etag, "$1")
}
// isETagEqual return true if the canonical representations of two ETag strings
// are equal, false otherwise
func isETagEqual(left, right string) bool {
return canonicalizeETag(left) == canonicalizeETag(right)
}
// setPutObjHeaders sets all the necessary headers returned back
// upon a success Put/Copy/CompleteMultipart/Delete requests
// to activate delete only headers set delete as true
func setPutObjHeaders(w http.ResponseWriter, objInfo ObjectInfo, delete bool) {
// We must not use the http.Header().Set method here because some (broken)
// clients expect the ETag header key to be literally "ETag" - not "Etag" (case-sensitive).
// Therefore, we have to set the ETag directly as map entry.
if objInfo.ETag != "" && !delete {
w.Header()[xhttp.ETag] = []string{`"` + objInfo.ETag + `"`}
}
// Set the relevant version ID as part of the response header.
if objInfo.VersionID != "" {
w.Header()[xhttp.AmzVersionID] = []string{objInfo.VersionID}
// If version is a deleted marker, set this header as well
if objInfo.DeleteMarker && delete { // only returned during delete object
w.Header()[xhttp.AmzDeleteMarker] = []string{strconv.FormatBool(objInfo.DeleteMarker)}
}
}
if objInfo.Bucket != "" && objInfo.Name != "" {
if lc, err := globalLifecycleSys.Get(objInfo.Bucket); err == nil && !delete {
lc.SetPredictionHeaders(w, objInfo.ToLifecycleOpts())
}
}
hash.AddChecksumHeader(w, objInfo.decryptChecksums())
}
func deleteObjectVersions(ctx context.Context, o ObjectLayer, bucket string, toDel []ObjectToDelete) {
for remaining := toDel; len(remaining) > 0; toDel = remaining {
if len(toDel) > maxDeleteList {
remaining = toDel[maxDeleteList:]
toDel = toDel[:maxDeleteList]
} else {
remaining = nil
}
vc, _ := globalBucketVersioningSys.Get(bucket)
deletedObjs, errs := o.DeleteObjects(ctx, bucket, toDel, ObjectOptions{
PrefixEnabledFn: vc.PrefixEnabled,
VersionSuspended: vc.Suspended(),
})
var logged bool
for i, err := range errs {
if err != nil {
if !logged {
// log the first error
logger.LogIf(ctx, err)
logged = true
}
continue
}
dobj := deletedObjs[i]
sendEvent(eventArgs{
EventName: event.ObjectRemovedDelete,
BucketName: bucket,
Object: ObjectInfo{
Name: dobj.ObjectName,
VersionID: dobj.VersionID,
},
Host: "Internal: [ILM-Expiry]",
})
}
}
}