frostfs-s3-gw/api/handler/get.go

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package handler
import (
"fmt"
"net/http"
"net/url"
"strconv"
"strings"
"time"
"github.com/nspcc-dev/neofs-s3-gw/api"
"github.com/nspcc-dev/neofs-s3-gw/api/data"
"github.com/nspcc-dev/neofs-s3-gw/api/errors"
"github.com/nspcc-dev/neofs-s3-gw/api/layer"
)
type conditionalArgs struct {
IfModifiedSince *time.Time
IfUnmodifiedSince *time.Time
IfMatch string
IfNoneMatch string
}
func fetchRangeHeader(headers http.Header, fullSize uint64) (*layer.RangeParams, error) {
const prefix = "bytes="
rangeHeader := headers.Get("Range")
if len(rangeHeader) == 0 {
return nil, nil
}
if fullSize == 0 {
return nil, errors.GetAPIError(errors.ErrInvalidRange)
}
if !strings.HasPrefix(rangeHeader, prefix) {
return nil, fmt.Errorf("unknown unit in range header")
}
arr := strings.Split(strings.TrimPrefix(rangeHeader, prefix), "-")
if len(arr) != 2 || (len(arr[0]) == 0 && len(arr[1]) == 0) {
return nil, fmt.Errorf("unknown byte-range-set")
}
var end, start uint64
var err0, err1 error
base, bitSize := 10, 64
if len(arr[0]) == 0 {
end, err1 = strconv.ParseUint(arr[1], base, bitSize)
start = fullSize - end
end = fullSize - 1
} else if len(arr[1]) == 0 {
start, err0 = strconv.ParseUint(arr[0], base, bitSize)
end = fullSize - 1
} else {
start, err0 = strconv.ParseUint(arr[0], base, bitSize)
end, err1 = strconv.ParseUint(arr[1], base, bitSize)
if end > fullSize-1 {
end = fullSize - 1
}
}
if err0 != nil || err1 != nil || start > end || start > fullSize {
return nil, errors.GetAPIError(errors.ErrInvalidRange)
}
return &layer.RangeParams{Start: start, End: end}, nil
}
func overrideResponseHeaders(h http.Header, query url.Values) {
for key, value := range query {
if hdr, ok := api.ResponseModifiers[strings.ToLower(key)]; ok {
h[hdr] = value
}
}
}
func writeHeaders(h http.Header, info *data.ObjectInfo, tagSetLength int) {
if len(info.ContentType) > 0 && h.Get(api.ContentType) == "" {
h.Set(api.ContentType, info.ContentType)
}
h.Set(api.LastModified, info.Created.UTC().Format(http.TimeFormat))
h.Set(api.ContentLength, strconv.FormatInt(info.Size, 10))
h.Set(api.ETag, info.HashSum)
h.Set(api.AmzVersionID, info.ID.EncodeToString())
h.Set(api.AmzTaggingCount, strconv.Itoa(tagSetLength))
if cacheControl := info.Headers[api.CacheControl]; cacheControl != "" {
h.Set(api.CacheControl, cacheControl)
}
if expires := info.Headers[api.Expires]; expires != "" {
h.Set(api.Expires, expires)
}
for key, val := range info.Headers {
if layer.IsSystemHeader(key) {
continue
}
h[api.MetadataPrefix+key] = []string{val}
}
}
func (h *handler) GetObjectHandler(w http.ResponseWriter, r *http.Request) {
var (
err error
info *data.ObjectInfo
params *layer.RangeParams
reqInfo = api.GetReqInfo(r.Context())
)
conditional, err := parseConditionalHeaders(r.Header)
if err != nil {
h.logAndSendError(w, "could not parse request params", reqInfo, err)
return
}
bktInfo, err := h.getBucketAndCheckOwner(r, reqInfo.BucketName)
if err != nil {
h.logAndSendError(w, "could not get bucket info", reqInfo, err)
return
}
p := &layer.HeadObjectParams{
BktInfo: bktInfo,
Object: reqInfo.ObjectName,
VersionID: reqInfo.URL.Query().Get(api.QueryVersionID),
}
if info, err = h.obj.GetObjectInfo(r.Context(), p); err != nil {
h.logAndSendError(w, "could not find object", reqInfo, err)
return
}
if err = checkPreconditions(info, conditional); err != nil {
h.logAndSendError(w, "precondition failed", reqInfo, err)
return
}
if params, err = fetchRangeHeader(r.Header, uint64(info.Size)); err != nil {
h.logAndSendError(w, "could not parse range header", reqInfo, err)
return
}
t := &data.ObjectTaggingInfo{
CnrID: &info.CID,
ObjName: info.Name,
VersionID: info.Version(),
}
tagSet, err := h.obj.GetObjectTagging(r.Context(), t)
if err != nil && !errors.IsS3Error(err, errors.ErrNoSuchKey) {
h.logAndSendError(w, "could not get object tag set", reqInfo, err)
return
}
if layer.IsAuthenticatedRequest(r.Context()) {
overrideResponseHeaders(w.Header(), reqInfo.URL.Query())
}
if err = h.setLockingHeaders(r.Context(), bktInfo, info, w.Header()); err != nil {
h.logAndSendError(w, "could not get locking info", reqInfo, err)
return
}
writeHeaders(w.Header(), info, len(tagSet))
if params != nil {
writeRangeHeaders(w, params, info.Size)
} else {
w.WriteHeader(http.StatusOK)
}
getParams := &layer.GetObjectParams{
ObjectInfo: info,
Writer: w,
Range: params,
BucketInfo: bktInfo,
}
if err = h.obj.GetObject(r.Context(), getParams); err != nil {
h.logAndSendError(w, "could not get object", reqInfo, err)
}
}
func checkPreconditions(info *data.ObjectInfo, args *conditionalArgs) error {
if len(args.IfMatch) > 0 && args.IfMatch != info.HashSum {
return errors.GetAPIError(errors.ErrPreconditionFailed)
}
if len(args.IfNoneMatch) > 0 && args.IfNoneMatch == info.HashSum {
return errors.GetAPIError(errors.ErrNotModified)
}
if args.IfModifiedSince != nil && info.Created.Before(*args.IfModifiedSince) {
return errors.GetAPIError(errors.ErrNotModified)
}
if args.IfUnmodifiedSince != nil && info.Created.After(*args.IfUnmodifiedSince) {
if len(args.IfMatch) == 0 {
return errors.GetAPIError(errors.ErrPreconditionFailed)
}
}
return nil
}
func parseConditionalHeaders(headers http.Header) (*conditionalArgs, error) {
var err error
args := &conditionalArgs{
IfMatch: headers.Get(api.IfMatch),
IfNoneMatch: headers.Get(api.IfNoneMatch),
}
if args.IfModifiedSince, err = parseHTTPTime(headers.Get(api.IfModifiedSince)); err != nil {
return nil, err
}
if args.IfUnmodifiedSince, err = parseHTTPTime(headers.Get(api.IfUnmodifiedSince)); err != nil {
return nil, err
}
return args, nil
}
func parseHTTPTime(data string) (*time.Time, error) {
if len(data) == 0 {
return nil, nil
}
result, err := time.Parse(http.TimeFormat, data)
if err != nil {
return nil, fmt.Errorf("couldn't parse http time %s: %w", data, err)
}
return &result, nil
}
func writeRangeHeaders(w http.ResponseWriter, params *layer.RangeParams, size int64) {
w.Header().Set(api.AcceptRanges, "bytes")
w.Header().Set(api.ContentRange, fmt.Sprintf("bytes %d-%d/%d", params.Start, params.End, size))
w.Header().Set(api.ContentLength, strconv.FormatUint(params.End-params.Start+1, 10))
w.WriteHeader(http.StatusPartialContent)
}