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