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

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package handler
import (
"bytes"
"crypto/md5"
"encoding/base64"
"encoding/json"
"encoding/xml"
errorsStd "errors"
"fmt"
"io"
"net"
"net/http"
"net/url"
"strconv"
"strings"
"time"
"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api"
"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/auth"
"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data"
"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/layer"
"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/layer/encryption"
"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/creds/accessbox"
"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/eacl"
"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/session"
"go.uber.org/zap"
)
type postPolicy struct {
Expiration time.Time `json:"expiration"`
Conditions []*policyCondition `json:"conditions"`
empty bool
}
func (p *postPolicy) condition(key string) *policyCondition {
for _, condition := range p.Conditions {
if condition.Key == key {
return condition
}
}
return nil
}
func (p *postPolicy) CheckContentLength(size int64) bool {
if p.empty {
return true
}
for _, condition := range p.Conditions {
if condition.Matching == "content-length-range" {
length := strconv.FormatInt(size, 10)
return condition.Key <= length && length <= condition.Value
}
}
return true
}
func (p *policyCondition) match(value string) bool {
switch p.Matching {
case "eq":
p.Matched = p.Value == value
case "starts-with":
if p.Key == api.ContentType {
p.Matched = true
for _, contentType := range strings.Split(value, ",") {
if !strings.HasPrefix(contentType, p.Value) {
p.Matched = false
}
}
} else {
p.Matched = strings.HasPrefix(value, p.Value)
}
}
return p.Matched
}
func (p *postPolicy) CheckField(key string, value string) error {
if p.empty {
return nil
}
cond := p.condition(key)
if cond == nil {
return errors.GetAPIError(errors.ErrPostPolicyConditionInvalidFormat)
}
if !cond.match(value) {
return errors.GetAPIError(errors.ErrPostPolicyConditionInvalidFormat)
}
return nil
}
func (p *postPolicy) AllConditionMatched() bool {
for _, condition := range p.Conditions {
if !condition.Matched {
return false
}
}
return true
}
type policyCondition struct {
Matching string
Key string
Value string
Matched bool
}
var errInvalidCondition = fmt.Errorf("invalid condition")
func (p *policyCondition) UnmarshalJSON(data []byte) error {
var (
ok bool
v interface{}
)
if err := json.Unmarshal(data, &v); err != nil {
return fmt.Errorf("unmarshal policy condition: %w", err)
}
switch v := v.(type) {
case []interface{}:
if len(v) != 3 {
return errInvalidCondition
}
if p.Matching, ok = v[0].(string); !ok {
return errInvalidCondition
}
if p.Matching == "content-length-range" {
min, ok := v[1].(float64)
max, ok2 := v[2].(float64)
if !ok || !ok2 {
return errInvalidCondition
}
p.Key = strconv.FormatFloat(min, 'f', 0, 32)
p.Value = strconv.FormatFloat(max, 'f', 0, 32)
} else {
key, ok2 := v[1].(string)
p.Value, ok = v[2].(string)
if !ok || !ok2 {
return errInvalidCondition
}
p.Key = strings.ToLower(strings.TrimPrefix(key, "$"))
}
case map[string]interface{}:
p.Matching = "eq"
for key, val := range v {
p.Key = strings.ToLower(key)
if p.Value, ok = val.(string); !ok {
return errInvalidCondition
}
}
default:
return fmt.Errorf("unknown condition type")
}
return nil
}
// keywords of predefined basic ACL values.
const (
basicACLPrivate = "private"
basicACLReadOnly = "public-read"
basicACLPublic = "public-read-write"
cannedACLAuthRead = "authenticated-read"
)
type createBucketParams struct {
XMLName xml.Name `xml:"http://s3.amazonaws.com/doc/2006-03-01/ CreateBucketConfiguration" json:"-"`
LocationConstraint string
}
func (h *handler) PutObjectHandler(w http.ResponseWriter, r *http.Request) {
var (
err error
newEaclTable *eacl.Table
sessionTokenEACL *session.Container
containsACL = containsACLHeaders(r)
reqInfo = api.GetReqInfo(r.Context())
)
if containsACL {
if sessionTokenEACL, err = getSessionTokenSetEACL(r.Context()); err != nil {
h.logAndSendError(w, "could not get eacl session token from a box", reqInfo, err)
return
}
}
tagSet, err := parseTaggingHeader(r.Header)
if err != nil {
h.logAndSendError(w, "could not parse tagging header", reqInfo, err)
return
}
bktInfo, err := h.getBucketAndCheckOwner(r, reqInfo.BucketName)
if err != nil {
h.logAndSendError(w, "could not get bucket objInfo", reqInfo, err)
return
}
metadata := parseMetadata(r)
if contentType := r.Header.Get(api.ContentType); len(contentType) > 0 {
metadata[api.ContentType] = contentType
}
if cacheControl := r.Header.Get(api.CacheControl); len(cacheControl) > 0 {
metadata[api.CacheControl] = cacheControl
}
if expires := r.Header.Get(api.Expires); len(expires) > 0 {
metadata[api.Expires] = expires
}
copiesNumber, err := getCopiesNumberOrDefault(metadata, h.cfg.CopiesNumber)
if err != nil {
h.logAndSendError(w, "invalid copies number", reqInfo, err)
return
}
encryptionParams, err := formEncryptionParams(r)
if err != nil {
h.logAndSendError(w, "invalid sse headers", reqInfo, err)
return
}
params := &layer.PutObjectParams{
BktInfo: bktInfo,
Object: reqInfo.ObjectName,
Reader: r.Body,
Size: r.ContentLength,
Header: metadata,
Encryption: encryptionParams,
CopiesNumber: copiesNumber,
}
settings, err := h.obj.GetBucketSettings(r.Context(), bktInfo)
if err != nil {
h.logAndSendError(w, "could not get bucket settings", reqInfo, err)
return
}
params.Lock, err = formObjectLock(r.Context(), bktInfo, settings.LockConfiguration, r.Header)
if err != nil {
h.logAndSendError(w, "could not form object lock", reqInfo, err)
return
}
extendedObjInfo, err := h.obj.PutObject(r.Context(), params)
if err != nil {
_, err2 := io.Copy(io.Discard, r.Body)
err3 := r.Body.Close()
h.logAndSendError(w, "could not upload object", reqInfo, err, zap.Errors("body close errors", []error{err2, err3}))
return
}
objInfo := extendedObjInfo.ObjectInfo
s := &SendNotificationParams{
Event: EventObjectCreatedPut,
NotificationInfo: data.NotificationInfoFromObject(objInfo),
BktInfo: bktInfo,
ReqInfo: reqInfo,
}
if err = h.sendNotifications(r.Context(), s); err != nil {
h.log.Error("couldn't send notification: %w", zap.Error(err))
}
if containsACL {
if newEaclTable, err = h.getNewEAclTable(r, bktInfo, objInfo); err != nil {
h.logAndSendError(w, "could not get new eacl table", reqInfo, err)
return
}
}
if tagSet != nil {
tagPrm := &layer.PutObjectTaggingParams{
ObjectVersion: &layer.ObjectVersion{
BktInfo: bktInfo,
ObjectName: objInfo.Name,
VersionID: objInfo.VersionID(),
},
TagSet: tagSet,
NodeVersion: extendedObjInfo.NodeVersion,
}
if _, err = h.obj.PutObjectTagging(r.Context(), tagPrm); err != nil {
h.logAndSendError(w, "could not upload object tagging", reqInfo, err)
return
}
}
if newEaclTable != nil {
p := &layer.PutBucketACLParams{
BktInfo: bktInfo,
EACL: newEaclTable,
SessionToken: sessionTokenEACL,
}
if err = h.obj.PutBucketACL(r.Context(), p); err != nil {
h.logAndSendError(w, "could not put bucket acl", reqInfo, err)
return
}
}
if settings.VersioningEnabled() {
w.Header().Set(api.AmzVersionID, objInfo.VersionID())
}
if encryptionParams.Enabled() {
addSSECHeaders(w.Header(), r.Header)
}
w.Header().Set(api.ETag, objInfo.HashSum)
api.WriteSuccessResponseHeadersOnly(w)
}
func getCopiesNumberOrDefault(metadata map[string]string, defaultCopiesNumber uint32) (uint32, error) {
copiesNumberStr, ok := metadata[layer.AttributeFrostfsCopiesNumber]
if !ok {
return defaultCopiesNumber, nil
}
copiesNumber, err := strconv.ParseUint(copiesNumberStr, 10, 32)
if err != nil {
return 0, fmt.Errorf("pasrse copies number: %w", err)
}
return uint32(copiesNumber), nil
}
func formEncryptionParams(r *http.Request) (enc encryption.Params, err error) {
sseCustomerAlgorithm := r.Header.Get(api.AmzServerSideEncryptionCustomerAlgorithm)
sseCustomerKey := r.Header.Get(api.AmzServerSideEncryptionCustomerKey)
sseCustomerKeyMD5 := r.Header.Get(api.AmzServerSideEncryptionCustomerKeyMD5)
if len(sseCustomerAlgorithm) == 0 && len(sseCustomerKey) == 0 && len(sseCustomerKeyMD5) == 0 {
return
}
if r.TLS == nil {
return enc, errorsStd.New("encryption available only when TLS is enabled")
}
if sseCustomerAlgorithm != layer.AESEncryptionAlgorithm {
return enc, errors.GetAPIError(errors.ErrInvalidEncryptionAlgorithm)
}
key, err := base64.StdEncoding.DecodeString(sseCustomerKey)
if err != nil {
return enc, errors.GetAPIError(errors.ErrInvalidSSECustomerKey)
}
if len(key) != layer.AESKeySize {
return enc, errors.GetAPIError(errors.ErrInvalidSSECustomerKey)
}
keyMD5, err := base64.StdEncoding.DecodeString(sseCustomerKeyMD5)
if err != nil {
return enc, errors.GetAPIError(errors.ErrSSECustomerKeyMD5Mismatch)
}
md5Sum := md5.Sum(key)
if !bytes.Equal(md5Sum[:], keyMD5) {
return enc, errors.GetAPIError(errors.ErrSSECustomerKeyMD5Mismatch)
}
params, err := encryption.NewParams(key)
if err == nil {
enc = *params
}
return enc, err
}
func (h *handler) PostObject(w http.ResponseWriter, r *http.Request) {
var (
newEaclTable *eacl.Table
tagSet map[string]string
sessionTokenEACL *session.Container
reqInfo = api.GetReqInfo(r.Context())
metadata = make(map[string]string)
containsACL = containsACLHeaders(r)
)
policy, err := checkPostPolicy(r, reqInfo, metadata)
if err != nil {
h.logAndSendError(w, "failed check policy", reqInfo, err)
return
}
if tagging := auth.MultipartFormValue(r, "tagging"); tagging != "" {
buffer := bytes.NewBufferString(tagging)
tagSet, err = readTagSet(buffer)
if err != nil {
h.logAndSendError(w, "could not read tag set", reqInfo, err)
return
}
}
if containsACL {
if sessionTokenEACL, err = getSessionTokenSetEACL(r.Context()); err != nil {
h.logAndSendError(w, "could not get eacl session token from a box", reqInfo, err)
return
}
}
var contentReader io.Reader
var size int64
if content, ok := r.MultipartForm.Value["file"]; ok {
contentReader = bytes.NewBufferString(content[0])
size = int64(len(content[0]))
} else {
file, head, err := r.FormFile("file")
if err != nil {
h.logAndSendError(w, "could get uploading file", reqInfo, err)
return
}
contentReader = file
size = head.Size
reqInfo.ObjectName = strings.ReplaceAll(reqInfo.ObjectName, "${filename}", head.Filename)
}
if !policy.CheckContentLength(size) {
h.logAndSendError(w, "invalid content-length", reqInfo, errors.GetAPIError(errors.ErrInvalidArgument))
return
}
bktInfo, err := h.obj.GetBucketInfo(r.Context(), reqInfo.BucketName)
if err != nil {
h.logAndSendError(w, "could not get bucket info", reqInfo, err)
return
}
params := &layer.PutObjectParams{
BktInfo: bktInfo,
Object: reqInfo.ObjectName,
Reader: contentReader,
Size: size,
Header: metadata,
}
extendedObjInfo, err := h.obj.PutObject(r.Context(), params)
if err != nil {
h.logAndSendError(w, "could not upload object", reqInfo, err)
return
}
objInfo := extendedObjInfo.ObjectInfo
s := &SendNotificationParams{
Event: EventObjectCreatedPost,
NotificationInfo: data.NotificationInfoFromObject(objInfo),
BktInfo: bktInfo,
ReqInfo: reqInfo,
}
if err = h.sendNotifications(r.Context(), s); err != nil {
h.log.Error("couldn't send notification: %w", zap.Error(err))
}
if acl := auth.MultipartFormValue(r, "acl"); acl != "" {
r.Header.Set(api.AmzACL, acl)
r.Header.Set(api.AmzGrantFullControl, "")
r.Header.Set(api.AmzGrantWrite, "")
r.Header.Set(api.AmzGrantRead, "")
if newEaclTable, err = h.getNewEAclTable(r, bktInfo, objInfo); err != nil {
h.logAndSendError(w, "could not get new eacl table", reqInfo, err)
return
}
}
if tagSet != nil {
tagPrm := &layer.PutObjectTaggingParams{
ObjectVersion: &layer.ObjectVersion{
BktInfo: bktInfo,
ObjectName: objInfo.Name,
VersionID: objInfo.VersionID(),
},
NodeVersion: extendedObjInfo.NodeVersion,
}
if _, err = h.obj.PutObjectTagging(r.Context(), tagPrm); err != nil {
h.logAndSendError(w, "could not upload object tagging", reqInfo, err)
return
}
}
if newEaclTable != nil {
p := &layer.PutBucketACLParams{
BktInfo: bktInfo,
EACL: newEaclTable,
SessionToken: sessionTokenEACL,
}
if err = h.obj.PutBucketACL(r.Context(), p); err != nil {
h.logAndSendError(w, "could not put bucket acl", reqInfo, err)
return
}
}
if settings, err := h.obj.GetBucketSettings(r.Context(), bktInfo); err != nil {
h.log.Warn("couldn't get bucket versioning", zap.String("bucket name", reqInfo.BucketName), zap.Error(err))
} else if settings.VersioningEnabled() {
w.Header().Set(api.AmzVersionID, objInfo.VersionID())
}
if redirectURL := auth.MultipartFormValue(r, "success_action_redirect"); redirectURL != "" {
http.Redirect(w, r, redirectURL, http.StatusTemporaryRedirect)
return
}
status := http.StatusNoContent
if statusStr := auth.MultipartFormValue(r, "success_action_status"); statusStr != "" {
switch statusStr {
case "200":
status = http.StatusOK
case "201":
status = http.StatusCreated
resp := &PostResponse{
Bucket: objInfo.Bucket,
Key: objInfo.Name,
ETag: objInfo.HashSum,
}
w.WriteHeader(status)
if _, err = w.Write(api.EncodeResponse(resp)); err != nil {
h.logAndSendError(w, "something went wrong", reqInfo, err)
}
return
}
}
w.Header().Set(api.ETag, objInfo.HashSum)
w.WriteHeader(status)
}
func checkPostPolicy(r *http.Request, reqInfo *api.ReqInfo, metadata map[string]string) (*postPolicy, error) {
policy := &postPolicy{empty: true}
if policyStr := auth.MultipartFormValue(r, "policy"); policyStr != "" {
policyData, err := base64.StdEncoding.DecodeString(policyStr)
if err != nil {
return nil, fmt.Errorf("could not decode policy: %w", err)
}
if err = json.Unmarshal(policyData, policy); err != nil {
return nil, fmt.Errorf("could not unmarshal policy: %w", err)
}
if policy.Expiration.Before(time.Now()) {
return nil, fmt.Errorf("policy is expired: %w", errors.GetAPIError(errors.ErrInvalidArgument))
}
policy.empty = false
}
for key, v := range r.MultipartForm.Value {
value := v[0]
if key == "file" || key == "policy" || key == "x-amz-signature" || strings.HasPrefix(key, "x-ignore-") {
continue
}
if err := policy.CheckField(key, value); err != nil {
return nil, fmt.Errorf("'%s' form field doesn't match the policy: %w", key, err)
}
prefix := strings.ToLower(api.MetadataPrefix)
if strings.HasPrefix(key, prefix) {
metadata[strings.TrimPrefix(key, prefix)] = value
}
if key == "content-type" {
metadata[api.ContentType] = value
}
if key == "key" {
reqInfo.ObjectName = value
}
}
for _, cond := range policy.Conditions {
if cond.Key == "bucket" {
if !cond.match(reqInfo.BucketName) {
return nil, errors.GetAPIError(errors.ErrPostPolicyConditionInvalidFormat)
}
}
}
return policy, nil
}
func containsACLHeaders(r *http.Request) bool {
return r.Header.Get(api.AmzACL) != "" || r.Header.Get(api.AmzGrantRead) != "" ||
r.Header.Get(api.AmzGrantFullControl) != "" || r.Header.Get(api.AmzGrantWrite) != ""
}
func (h *handler) getNewEAclTable(r *http.Request, bktInfo *data.BucketInfo, objInfo *data.ObjectInfo) (*eacl.Table, error) {
var newEaclTable *eacl.Table
key, err := h.bearerTokenIssuerKey(r.Context())
if err != nil {
return nil, fmt.Errorf("get bearer token issuer: %w", err)
}
objectACL, err := parseACLHeaders(r.Header, key)
if err != nil {
return nil, fmt.Errorf("could not parse object acl: %w", err)
}
resInfo := &resourceInfo{
Bucket: objInfo.Bucket,
Object: objInfo.Name,
Version: objInfo.VersionID(),
}
bktPolicy, err := aclToPolicy(objectACL, resInfo)
if err != nil {
return nil, fmt.Errorf("could not translate object acl to bucket policy: %w", err)
}
astChild, err := policyToAst(bktPolicy)
if err != nil {
return nil, fmt.Errorf("could not translate policy to ast: %w", err)
}
bacl, err := h.obj.GetBucketACL(r.Context(), bktInfo)
if err != nil {
return nil, fmt.Errorf("could not get bucket eacl: %w", err)
}
parentAst := tableToAst(bacl.EACL, objInfo.Bucket)
strCID := bacl.Info.CID.EncodeToString()
for _, resource := range parentAst.Resources {
if resource.Bucket == strCID {
resource.Bucket = objInfo.Bucket
}
}
if resAst, updated := mergeAst(parentAst, astChild); updated {
if newEaclTable, err = astToTable(resAst); err != nil {
return nil, fmt.Errorf("could not translate ast to table: %w", err)
}
}
return newEaclTable, nil
}
func parseTaggingHeader(header http.Header) (map[string]string, error) {
var tagSet map[string]string
if tagging := header.Get(api.AmzTagging); len(tagging) > 0 {
queries, err := url.ParseQuery(tagging)
if err != nil {
return nil, errors.GetAPIError(errors.ErrInvalidArgument)
}
if len(queries) > maxTags {
return nil, errors.GetAPIError(errors.ErrInvalidTagsSizeExceed)
}
tagSet = make(map[string]string, len(queries))
for k, v := range queries {
tag := Tag{Key: k, Value: v[0]}
if err = checkTag(tag); err != nil {
return nil, err
}
tagSet[tag.Key] = tag.Value
}
}
return tagSet, nil
}
func parseMetadata(r *http.Request) map[string]string {
res := make(map[string]string)
for k, v := range r.Header {
if strings.HasPrefix(k, api.MetadataPrefix) {
key := strings.ToLower(strings.TrimPrefix(k, api.MetadataPrefix))
res[key] = v[0]
}
}
return res
}
func (h *handler) CreateBucketHandler(w http.ResponseWriter, r *http.Request) {
reqInfo := api.GetReqInfo(r.Context())
p := &layer.CreateBucketParams{
Name: reqInfo.BucketName,
}
if err := checkBucketName(reqInfo.BucketName); err != nil {
h.logAndSendError(w, "invalid bucket name", reqInfo, err)
return
}
key, err := h.bearerTokenIssuerKey(r.Context())
if err != nil {
h.logAndSendError(w, "couldn't get bearer token signature key", reqInfo, err)
return
}
bktACL, err := parseACLHeaders(r.Header, key)
if err != nil {
h.logAndSendError(w, "could not parse bucket acl", reqInfo, err)
return
}
resInfo := &resourceInfo{Bucket: reqInfo.BucketName}
p.EACL, err = bucketACLToTable(bktACL, resInfo)
if err != nil {
h.logAndSendError(w, "could translate bucket acl to eacl", reqInfo, err)
return
}
createParams, err := parseLocationConstraint(r)
if err != nil {
h.logAndSendError(w, "could not parse body", reqInfo, err)
return
}
var policies []*accessbox.ContainerPolicy
boxData, err := layer.GetBoxData(r.Context())
if err == nil {
policies = boxData.Policies
p.SessionContainerCreation = boxData.Gate.SessionTokenForPut()
p.SessionEACL = boxData.Gate.SessionTokenForSetEACL()
}
if p.SessionContainerCreation == nil {
h.logAndSendError(w, "couldn't find session token for put", reqInfo, errors.GetAPIError(errors.ErrAccessDenied))
return
}
if p.SessionEACL == nil {
h.logAndSendError(w, "couldn't find session token for setEACL", reqInfo, errors.GetAPIError(errors.ErrAccessDenied))
return
}
if err = h.setPolicy(p, createParams.LocationConstraint, policies); err != nil {
h.logAndSendError(w, "couldn't set placement policy", reqInfo, err)
return
}
p.ObjectLockEnabled = isLockEnabled(r.Header)
bktInfo, err := h.obj.CreateBucket(r.Context(), p)
if err != nil {
h.logAndSendError(w, "could not create bucket", reqInfo, err)
return
}
h.log.Info("bucket is created", zap.String("reqId", reqInfo.RequestID),
zap.String("bucket", reqInfo.BucketName), zap.Stringer("container_id", bktInfo.CID))
if p.ObjectLockEnabled {
sp := &layer.PutSettingsParams{
BktInfo: bktInfo,
Settings: &data.BucketSettings{Versioning: data.VersioningEnabled},
}
if err = h.obj.PutBucketSettings(r.Context(), sp); err != nil {
h.logAndSendError(w, "couldn't enable bucket versioning", reqInfo, err,
zap.String("container_id", bktInfo.CID.EncodeToString()))
return
}
}
api.WriteSuccessResponseHeadersOnly(w)
}
func (h handler) setPolicy(prm *layer.CreateBucketParams, locationConstraint string, userPolicies []*accessbox.ContainerPolicy) error {
prm.Policy = h.cfg.Policy.Default()
prm.LocationConstraint = locationConstraint
if locationConstraint == "" {
return nil
}
for _, placementPolicy := range userPolicies {
if placementPolicy.LocationConstraint == locationConstraint {
prm.Policy = placementPolicy.Policy
return nil
}
}
if policy, ok := h.cfg.Policy.Get(locationConstraint); ok {
prm.Policy = policy
return nil
}
return errors.GetAPIError(errors.ErrInvalidLocationConstraint)
}
func isLockEnabled(header http.Header) bool {
lockEnabledStr := header.Get(api.AmzBucketObjectLockEnabled)
lockEnabled, _ := strconv.ParseBool(lockEnabledStr)
return lockEnabled
}
func checkBucketName(bucketName string) error {
if len(bucketName) < 3 || len(bucketName) > 63 {
return errors.GetAPIError(errors.ErrInvalidBucketName)
}
if strings.HasPrefix(bucketName, "xn--") || strings.HasSuffix(bucketName, "-s3alias") {
return errors.GetAPIError(errors.ErrInvalidBucketName)
}
if net.ParseIP(bucketName) != nil {
return errors.GetAPIError(errors.ErrInvalidBucketName)
}
labels := strings.Split(bucketName, ".")
for _, label := range labels {
if len(label) == 0 {
return errors.GetAPIError(errors.ErrInvalidBucketName)
}
for i, r := range label {
if !isAlphaNum(r) && r != '-' {
return errors.GetAPIError(errors.ErrInvalidBucketName)
}
if (i == 0 || i == len(label)-1) && r == '-' {
return errors.GetAPIError(errors.ErrInvalidBucketName)
}
}
}
return nil
}
func isAlphaNum(char int32) bool {
return 'a' <= char && char <= 'z' || '0' <= char && char <= '9'
}
func parseLocationConstraint(r *http.Request) (*createBucketParams, error) {
if r.ContentLength == 0 {
return new(createBucketParams), nil
}
params := new(createBucketParams)
if err := xml.NewDecoder(r.Body).Decode(params); err != nil {
return nil, errors.GetAPIError(errors.ErrMalformedXML)
}
return params, nil
}