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

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package handler
import (
"encoding/xml"
"fmt"
"net/http"
"strconv"
"strings"
"github.com/nspcc-dev/neofs-s3-gw/api"
"github.com/nspcc-dev/neofs-s3-gw/api/errors"
"github.com/nspcc-dev/neofs-s3-gw/api/layer"
)
type (
// CORSConfiguration stores CORS configuration of a request.
CORSConfiguration struct {
XMLName xml.Name `xml:"http://s3.amazonaws.com/doc/2006-03-01/ CORSConfiguration" json:"-"`
CORSRules []CORSRule `xml:"CORSRule" json:"CORSRules"`
}
// CORSRule stores rules for CORS in a bucket.
CORSRule struct {
ID string `xml:"ID,omitempty" json:"ID,omitempty"`
AllowedHeaders []string `xml:"AllowedHeader" json:"AllowedHeaders"`
AllowedMethods []string `xml:"AllowedMethod" json:"AllowedMethods"`
AllowedOrigins []string `xml:"AllowedOrigin" json:"AllowedOrigins"`
ExposeHeaders []string `xml:"ExposeHeader" json:"ExposeHeaders"`
MaxAgeSeconds int `xml:"MaxAgeSeconds,omitempty" json:"MaxAgeSeconds,omitempty"`
}
)
const (
// DefaultMaxAge -- default value of Access-Control-Max-Age if this value is not set in a rule.
DefaultMaxAge = 600
wildcard = "*"
)
var supportedMethods = map[string]struct{}{"GET": {}, "HEAD": {}, "POST": {}, "PUT": {}, "DELETE": {}}
func (h *handler) GetBucketCorsHandler(w http.ResponseWriter, r *http.Request) {
reqInfo := api.GetReqInfo(r.Context())
bktInfo, err := h.obj.GetBucketInfo(r.Context(), reqInfo.BucketName)
if err != nil {
h.logAndSendError(w, "could not get bucket info", reqInfo, err)
return
}
if err = checkOwner(bktInfo, r.Header.Get(api.AmzExpectedBucketOwner)); err != nil {
h.logAndSendError(w, "expected owner doesn't match", reqInfo, err)
return
}
info, err := h.obj.GetBucketCORS(r.Context(), bktInfo)
if err != nil {
h.logAndSendError(w, "could not get cors", reqInfo, err)
return
}
api.WriteResponse(w, http.StatusOK, info, api.MimeNone)
}
func (h *handler) PutBucketCorsHandler(w http.ResponseWriter, r *http.Request) {
reqInfo := api.GetReqInfo(r.Context())
bktInfo, err := h.obj.GetBucketInfo(r.Context(), reqInfo.BucketName)
if err != nil {
h.logAndSendError(w, "could not get bucket info", reqInfo, err)
return
}
if err = checkOwner(bktInfo, r.Header.Get(api.AmzExpectedBucketOwner)); err != nil {
h.logAndSendError(w, "expected owner doesn't match", reqInfo, err)
return
}
cors := &CORSConfiguration{}
if err := xml.NewDecoder(r.Body).Decode(cors); err != nil {
h.logAndSendError(w, "could not parse cors configuration", reqInfo, err)
return
}
if cors.CORSRules == nil {
h.logAndSendError(w, "could not parse cors rules", reqInfo, errors.GetAPIError(errors.ErrMalformedXML))
return
}
if err = checkCORS(cors); err != nil {
h.logAndSendError(w, "invalid cors configuration", reqInfo, err)
return
}
xml, err := xml.Marshal(cors)
if err != nil {
h.logAndSendError(w, "could not encode cors configuration to xml", reqInfo, err)
return
}
p := &layer.PutCORSParams{
BktInfo: bktInfo,
CORSConfiguration: xml,
}
if err = h.obj.PutBucketCORS(r.Context(), p); err != nil {
h.logAndSendError(w, "could not put cors configuration", reqInfo, err)
return
}
api.WriteSuccessResponseHeadersOnly(w)
}
func (h *handler) DeleteBucketCorsHandler(w http.ResponseWriter, r *http.Request) {
reqInfo := api.GetReqInfo(r.Context())
bktInfo, err := h.obj.GetBucketInfo(r.Context(), reqInfo.BucketName)
if err != nil {
h.logAndSendError(w, "could not get bucket info", reqInfo, err)
return
}
if err = checkOwner(bktInfo, r.Header.Get(api.AmzExpectedBucketOwner)); err != nil {
h.logAndSendError(w, "expected owner doesn't match", reqInfo, err)
return
}
if err := h.obj.DeleteBucketCORS(r.Context(), bktInfo); err != nil {
h.logAndSendError(w, "could not delete cors", reqInfo, err)
}
w.WriteHeader(http.StatusNoContent)
}
func (h *handler) AppendCORSHeaders(w http.ResponseWriter, r *http.Request) {
if r.Method == http.MethodOptions {
return
}
origin := r.Header.Get(api.Origin)
if origin == "" {
return
}
reqInfo := api.GetReqInfo(r.Context())
if reqInfo.BucketName == "" {
return
}
bktInfo, err := h.obj.GetBucketInfo(r.Context(), reqInfo.BucketName)
if err != nil {
return
}
info, err := h.obj.GetBucketCORS(r.Context(), bktInfo)
if err != nil {
return
}
cors := &CORSConfiguration{}
if err = xml.Unmarshal(info, cors); err != nil {
return
}
withCredentials := r.Header.Get(api.Authorization) != ""
for _, rule := range cors.CORSRules {
for _, o := range rule.AllowedOrigins {
if o == origin {
for _, m := range rule.AllowedMethods {
if m == r.Method {
w.Header().Set(api.AccessControlAllowOrigin, origin)
w.Header().Set(api.AccessControlAllowMethods, strings.Join(rule.AllowedMethods, ", "))
w.Header().Set(api.AccessControlAllowCredentials, "true")
w.Header().Set(api.Vary, api.Origin)
return
}
}
}
if o == wildcard {
for _, m := range rule.AllowedMethods {
if m == r.Method {
if withCredentials {
w.Header().Set(api.AccessControlAllowOrigin, origin)
w.Header().Set(api.AccessControlAllowCredentials, "true")
w.Header().Set(api.Vary, api.Origin)
} else {
w.Header().Set(api.AccessControlAllowOrigin, o)
}
w.Header().Set(api.AccessControlAllowMethods, strings.Join(rule.AllowedMethods, ", "))
return
}
}
}
}
}
}
func (h *handler) Preflight(w http.ResponseWriter, r *http.Request) {
reqInfo := api.GetReqInfo(r.Context())
bktInfo, err := h.obj.GetBucketInfo(r.Context(), reqInfo.BucketName)
if err != nil {
h.logAndSendError(w, "could not get bucket info", reqInfo, err)
return
}
origin := r.Header.Get(api.Origin)
if origin == "" {
h.logAndSendError(w, "origin request header needed", reqInfo, errors.GetAPIError(errors.ErrBadRequest))
}
method := r.Header.Get(api.AccessControlRequestMethod)
if method == "" {
h.logAndSendError(w, "Access-Control-Request-Method request header needed", reqInfo, errors.GetAPIError(errors.ErrBadRequest))
return
}
var headers []string
requestHeaders := r.Header.Get(api.AccessControlRequestHeaders)
if requestHeaders != "" {
headers = strings.Split(requestHeaders, ", ")
}
info, err := h.obj.GetBucketCORS(r.Context(), bktInfo)
if err != nil {
h.logAndSendError(w, "could not get cors", reqInfo, err)
return
}
cors := &CORSConfiguration{}
if err = xml.Unmarshal(info, cors); err != nil {
h.logAndSendError(w, "could not parse cors configuration", reqInfo, err)
return
}
for _, rule := range cors.CORSRules {
for _, o := range rule.AllowedOrigins {
if o == origin || o == wildcard {
for _, m := range rule.AllowedMethods {
if m == method {
if !checkSubslice(rule.AllowedHeaders, headers) {
continue
}
w.Header().Set(api.AccessControlAllowOrigin, o)
w.Header().Set(api.AccessControlAllowMethods, strings.Join(rule.AllowedMethods, ", "))
if headers != nil {
w.Header().Set(api.AccessControlAllowHeaders, requestHeaders)
}
if rule.ExposeHeaders != nil {
w.Header().Set(api.AccessControlExposeHeaders, strings.Join(rule.ExposeHeaders, ", "))
}
if rule.MaxAgeSeconds > 0 || rule.MaxAgeSeconds == -1 {
w.Header().Set(api.AccessControlMaxAge, strconv.Itoa(rule.MaxAgeSeconds))
} else {
w.Header().Set(api.AccessControlMaxAge, strconv.Itoa(h.cfg.DefaultMaxAge))
}
if o != wildcard {
w.Header().Set(api.AccessControlAllowCredentials, "true")
}
api.WriteSuccessResponseHeadersOnly(w)
return
}
}
}
}
}
h.logAndSendError(w, "Forbidden", reqInfo, errors.GetAPIError(errors.ErrAccessDenied))
}
func checkCORS(cors *CORSConfiguration) error {
for _, r := range cors.CORSRules {
for _, m := range r.AllowedMethods {
if _, ok := supportedMethods[m]; !ok {
return errors.GetAPIErrorWithError(errors.ErrCORSUnsupportedMethod, fmt.Errorf("unsupported method is %s", m))
}
}
for _, h := range r.ExposeHeaders {
if h == wildcard {
return errors.GetAPIError(errors.ErrCORSWildcardExposeHeaders)
}
}
}
return nil
}
func checkSubslice(slice []string, subSlice []string) bool {
if sliceContains(slice, wildcard) {
return true
}
if len(subSlice) > len(slice) {
return false
}
for _, r := range subSlice {
if !sliceContains(slice, r) {
return false
}
}
return true
}
func sliceContains(slice []string, str string) bool {
for _, s := range slice {
if s == str {
return true
}
}
return false
}