7875d472bc
Skip notifications on objects that might have had an error during deletion, this also avoids unnecessary replication attempt on such objects. Refactor some places to make sure that we have notified the client before we - notify - schedule for replication - lifecycle etc.
280 lines
10 KiB
Go
280 lines
10 KiB
Go
/*
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* MinIO Cloud Storage, (C) 2016, 2017, 2018 MinIO, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package cmd
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import (
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"context"
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"fmt"
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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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xhttp "github.com/minio/minio/cmd/http"
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"github.com/minio/minio/pkg/bucket/lifecycle"
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)
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var (
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etagRegex = regexp.MustCompile("\"*?([^\"]*?)\"*?$")
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)
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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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// 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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// 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 := time.Parse(http.TimeFormat, 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, guessIsBrowserReq(r))
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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 := time.Parse(http.TimeFormat, 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, guessIsBrowserReq(r))
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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, guessIsBrowserReq(r))
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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, guessIsBrowserReq(r))
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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 GET/HEAD operation should not proceed.
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// Preconditions supported are:
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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, guessIsBrowserReq(r))
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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 := time.Parse(http.TimeFormat, 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 := time.Parse(http.TimeFormat, 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, guessIsBrowserReq(r))
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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, guessIsBrowserReq(r))
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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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ruleID, expiryTime := lc.PredictExpiryTime(lifecycle.ObjectOpts{
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Name: objInfo.Name,
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UserTags: objInfo.UserTags,
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VersionID: objInfo.VersionID,
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ModTime: objInfo.ModTime,
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IsLatest: objInfo.IsLatest,
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DeleteMarker: objInfo.DeleteMarker,
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})
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if !expiryTime.IsZero() {
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w.Header()[xhttp.AmzExpiration] = []string{
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fmt.Sprintf(`expiry-date="%s", rule-id="%s"`, expiryTime.Format(http.TimeFormat), ruleID),
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}
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}
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}
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}
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}
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