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[#217] Add CORS support

Browse source 
Signed-off-by: Angira Kekteeva <kira@nspcc.ru>
This commit is contained in:
Angira Kekteeva 2021-10-04 17:32:35 +03:00 committed by Kirillov Denis
parent ccf5db95a5
commit 7d0bc1e992
12 changed files with 434 additions and 25 deletions
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8
api/data/info.go
View file

@ -8,7 +8,10 @@ import (
"github.com/nspcc-dev/neofs-api-go/pkg/owner"
)
const bktVersionSettingsObject = ".s3-versioning-settings"
const (
bktVersionSettingsObject = ".s3-versioning-settings"
bktCORSConfigurationObject = ".s3-cors"
)
type (
// BucketInfo stores basic bucket data.
@ -41,6 +44,9 @@ type (
// SettingsObjectName is system name for bucket settings file.
func (b *BucketInfo) SettingsObjectName() string { return bktVersionSettingsObject }
// CORSObjectName returns system name for bucket CORS configuration file.
func (b *BucketInfo) CORSObjectName() string { return bktCORSConfigurationObject }
// Version returns object version from ObjectInfo.
func (o *ObjectInfo) Version() string { return o.ID.String() }

1
api/handler/api.go
View file

@ -19,6 +19,7 @@ type (
// Config contains data which handler need to keep.
Config struct {
DefaultPolicy *netmap.PlacementPolicy
DefaultMaxAge int
}
)

298
api/handler/cors.go Normal file
View file

@ -0,0 +1,298 @@
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.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)
}
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 fmt.Errorf("unsupported HTTP method in CORS config %s", m)
}
}
for _, h := range r.ExposeHeaders {
if h == wildcard {
return fmt.Errorf("ExposeHeader \"*\" contains wildcard. We currently do not support wildcard " +
"for ExposeHeader")
}
}
}
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
}

4
api/handler/unimplemented.go
View file

@ -59,10 +59,6 @@ func (h *handler) GetBucketEncryptionHandler(w http.ResponseWriter, r *http.Requ
h.logAndSendError(w, "not implemented", api.GetReqInfo(r.Context()), errors.GetAPIError(errors.ErrNotImplemented))
}
func (h *handler) GetBucketCorsHandler(w http.ResponseWriter, r *http.Request) {
h.logAndSendError(w, "not implemented", api.GetReqInfo(r.Context()), errors.GetAPIError(errors.ErrNotImplemented))
}
func (h *handler) GetBucketWebsiteHandler(w http.ResponseWriter, r *http.Request) {
h.logAndSendError(w, "not implemented", api.GetReqInfo(r.Context()), errors.GetAPIError(errors.ErrNotImplemented))
}

13
api/headers.go
View file

@ -46,6 +46,19 @@ const (
AmzSourceExpectedBucketOwner = "X-Amz-Source-Expected-Bucket-Owner"
ContainerID = "X-Container-Id"
AccessControlAllowOrigin = "Access-Control-Allow-Origin"
AccessControlAllowMethods = "Access-Control-Allow-Methods"
AccessControlExposeHeaders = "Access-Control-Expose-Headers"
AccessControlAllowHeaders = "Access-Control-Allow-Headers"
AccessControlMaxAge = "Access-Control-Max-Age"
AccessControlAllowCredentials = "Access-Control-Allow-Credentials"
Origin = "Origin"
AccessControlRequestMethod = "Access-Control-Request-Method"
AccessControlRequestHeaders = "Access-Control-Request-Headers"
Vary = "Vary"
)
// S3 request query params.

42
api/layer/cors.go Normal file
View file

@ -0,0 +1,42 @@
package layer
import (
"context"
"github.com/nspcc-dev/neofs-s3-gw/api/data"
"github.com/nspcc-dev/neofs-s3-gw/api/errors"
)
func (n *layer) PutBucketCORS(ctx context.Context, p *PutCORSParams) error {
s := &PutSystemObjectParams{
BktInfo: p.BktInfo,
ObjName: p.BktInfo.CORSObjectName(),
Metadata: map[string]string{},
Prefix: "",
Payload: p.CORSConfiguration,
}
_, err := n.putSystemObject(ctx, s)
return err
}
func (n *layer) GetBucketCORS(ctx context.Context, bktInfo *data.BucketInfo) ([]byte, error) {
obj, err := n.getSystemObject(ctx, bktInfo, bktInfo.CORSObjectName())
if err != nil {
if errors.IsS3Error(err, errors.ErrNoSuchKey) {
return nil, errors.GetAPIError(errors.ErrNoSuchCORSConfiguration)
}
return nil, err
}
if obj.Payload() == nil {
return nil, errors.GetAPIError(errors.ErrInternalError)
}
return obj.Payload(), nil
}
func (n *layer) DeleteBucketCORS(ctx context.Context, bktInfo *data.BucketInfo) error {
return n.deleteSystemObject(ctx, bktInfo, bktInfo.CORSObjectName())
}

12
api/layer/layer.go
View file

@ -91,6 +91,12 @@ type (
Settings *BucketSettings
}
// PutCORSParams stores PutCORS request parameters.
PutCORSParams struct {
BktInfo *data.BucketInfo
CORSConfiguration []byte
}
// BucketSettings stores settings such as versioning.
BucketSettings struct {
VersioningEnabled bool
@ -168,6 +174,10 @@ type (
PutBucketVersioning(ctx context.Context, p *PutVersioningParams) (*data.ObjectInfo, error)
GetBucketVersioning(ctx context.Context, name string) (*BucketSettings, error)
PutBucketCORS(ctx context.Context, p *PutCORSParams) error
GetBucketCORS(ctx context.Context, bktInfo *data.BucketInfo) ([]byte, error)
DeleteBucketCORS(ctx context.Context, bktInfo *data.BucketInfo) error
ListBuckets(ctx context.Context) ([]*data.BucketInfo, error)
GetBucketInfo(ctx context.Context, name string) (*data.BucketInfo, error)
GetBucketACL(ctx context.Context, name string) (*BucketACL, error)
@ -346,7 +356,7 @@ func (n *layer) GetObject(ctx context.Context, p *GetObjectParams) error {
params.Range = objRange
_, err = n.objectRange(ctx, params)
} else {
_, err = n.objectGet(ctx, params)
_, err = n.objectGetWithPayloadWriter(ctx, params)
}
if err != nil {

10
api/layer/object.go
View file

@ -104,14 +104,20 @@ func (n *layer) objectHead(ctx context.Context, cid *cid.ID, oid *object.ID) (*o
return n.pool.GetObjectHeader(ctx, ops, n.BearerOpt(ctx))
}
// objectGet and write it into provided io.Reader.
func (n *layer) objectGet(ctx context.Context, p *getParams) (*object.Object, error) {
// objectGetWithPayloadWriter and write it into provided io.Reader.
func (n *layer) objectGetWithPayloadWriter(ctx context.Context, p *getParams) (*object.Object, error) {
// prepare length/offset writer
w := newWriter(p.Writer, p.offset, p.length)
ops := new(client.GetObjectParams).WithAddress(newAddress(p.cid, p.oid)).WithPayloadWriter(w)
return n.pool.GetObject(ctx, ops, n.BearerOpt(ctx))
}
// objectGet returns an object with payload in the object.
func (n *layer) objectGet(ctx context.Context, cid *cid.ID, oid *object.ID) (*object.Object, error) {
ops := new(client.GetObjectParams).WithAddress(newAddress(cid, oid))
return n.pool.GetObject(ctx, ops, n.BearerOpt(ctx))
}
// objectRange gets object range and writes it into provided io.Writer.
func (n *layer) objectRange(ctx context.Context, p *getParams) ([]byte, error) {
w := newWriter(p.Writer, p.offset, p.length)

16
api/layer/system_object.go
View file

@ -107,19 +107,17 @@ func (n *layer) getSystemObject(ctx context.Context, bktInfo *data.BucketInfo, o
objInfo := versions.getLast()
buf := new(bytes.Buffer)
p := &getParams{
Writer: buf,
cid: bktInfo.CID,
oid: objInfo.ID,
}
obj, err := n.objectGet(ctx, p)
obj, err := n.objectGet(ctx, bktInfo.CID, objInfo.ID)
if err != nil {
return nil, err
}
obj.ToV2().SetPayload(buf.Bytes())
if err = n.systemCache.Put(systemObjectKey(bktInfo, objName), obj); err != nil {
n.log.Warn("couldn't put system meta to objects cache",
zap.Stringer("object id", obj.ID()),
zap.Stringer("bucket id", obj.ContainerID()),
zap.Error(err))
}
return obj, nil
}

32
api/router.go
View file

@ -44,6 +44,8 @@ type (
GetBucketACLHandler(http.ResponseWriter, *http.Request)
PutBucketACLHandler(http.ResponseWriter, *http.Request)
GetBucketCorsHandler(http.ResponseWriter, *http.Request)
PutBucketCorsHandler(http.ResponseWriter, *http.Request)
DeleteBucketCorsHandler(http.ResponseWriter, *http.Request)
GetBucketWebsiteHandler(http.ResponseWriter, *http.Request)
GetBucketAccelerateHandler(http.ResponseWriter, *http.Request)
GetBucketRequestPaymentHandler(http.ResponseWriter, *http.Request)
@ -77,6 +79,8 @@ type (
DeleteBucketEncryptionHandler(http.ResponseWriter, *http.Request)
DeleteBucketHandler(http.ResponseWriter, *http.Request)
ListBucketsHandler(http.ResponseWriter, *http.Request)
Preflight(w http.ResponseWriter, r *http.Request)
AppendCORSHeaders(w http.ResponseWriter, r *http.Request)
}
// mimeType represents various MIME type used API responses.
@ -131,6 +135,15 @@ func setRequestID(h http.Handler) http.Handler {
})
}
func appendCORS(handler Handler) mux.MiddlewareFunc {
return func(h http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
handler.AppendCORSHeaders(w, r)
h.ServeHTTP(w, r)
})
}
}
func logErrorResponse(l *zap.Logger) mux.MiddlewareFunc {
return func(h http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
@ -197,6 +210,11 @@ func Attach(r *mux.Router, domains []string, m MaxClients, h Handler, center aut
for _, bucket := range buckets {
// Object operations
// HeadObject
bucket.Use(
// -- append CORS headers to a response for
appendCORS(h),
)
bucket.Methods(http.MethodOptions).HandlerFunc(m.Handle(metrics.APIStats("preflight", h.Preflight))).Name("Options")
bucket.Methods(http.MethodHead).Path("/{object:.+}").HandlerFunc(
m.Handle(metrics.APIStats("headobject", h.HeadObjectHandler))).Name("HeadObject")
// CopyObjectPart
@ -296,7 +314,15 @@ func Attach(r *mux.Router, domains []string, m MaxClients, h Handler, center aut
bucket.Methods(http.MethodGet).HandlerFunc(
m.Handle(metrics.APIStats("getbucketencryption", h.GetBucketEncryptionHandler))).Queries("encryption", "").
Name("GetBucketEncryption")
bucket.Methods(http.MethodGet).HandlerFunc(
m.Handle(metrics.APIStats("getbucketcors", h.GetBucketCorsHandler))).Queries("cors", "").
Name("GetBucketCors")
bucket.Methods(http.MethodPut).HandlerFunc(
m.Handle(metrics.APIStats("putbucketcors", h.PutBucketCorsHandler))).Queries("cors", "").
Name("PutBucketCors")
bucket.Methods(http.MethodDelete).HandlerFunc(
m.Handle(metrics.APIStats("deletebucketcors", h.DeleteBucketCorsHandler))).Queries("cors", "").
Name("DeleteBucketCors")
// Dummy Bucket Calls
// GetBucketACL -- this is a dummy call.
bucket.Methods(http.MethodGet).HandlerFunc(
@ -306,10 +332,6 @@ func Attach(r *mux.Router, domains []string, m MaxClients, h Handler, center aut
bucket.Methods(http.MethodPut).HandlerFunc(
m.Handle(metrics.APIStats("putbucketacl", h.PutBucketACLHandler))).Queries("acl", "").
Name("PutBucketACL")
// GetBucketCors - this is a dummy call.
bucket.Methods(http.MethodGet).HandlerFunc(
m.Handle(metrics.APIStats("getbucketcors", h.GetBucketCorsHandler))).Queries("cors", "").
Name("GetBucketCors")
// GetBucketWebsiteHandler - this is a dummy call.
bucket.Methods(http.MethodGet).HandlerFunc(
m.Handle(metrics.APIStats("getbucketwebsite", h.GetBucketWebsiteHandler))).Queries("website", "").

14
cmd/s3-gw/app.go
View file

@ -6,6 +6,7 @@ import (
"math"
"net"
"net/http"
"strconv"
"time"
"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
@ -280,6 +281,7 @@ func getHandlerOptions(v *viper.Viper, l *zap.Logger) *handler.Config {
cfg handler.Config
err error
policyStr = handler.DefaultPolicy
defaultMaxAge = handler.DefaultMaxAge
)
if v.IsSet(cfgDefaultPolicy) {
@ -291,5 +293,17 @@ func getHandlerOptions(v *viper.Viper, l *zap.Logger) *handler.Config {
zap.Error(err))
}
if v.IsSet(cfgDefaultMaxAge) {
defaultMaxAge = v.GetInt(cfgDefaultMaxAge)
if defaultMaxAge <= 0 && defaultMaxAge != -1 {
l.Fatal("invalid defaultMaxAge",
zap.String("parameter", cfgDefaultMaxAge),
zap.String("value in config", strconv.Itoa(defaultMaxAge)))
}
}
cfg.DefaultMaxAge = defaultMaxAge
return &cfg
}

3
cmd/s3-gw/app_settings.go
View file

@ -71,6 +71,9 @@ const ( // Settings.
// Policy.
cfgDefaultPolicy = "default_policy"
// CORS.
cfgDefaultMaxAge = "cors.default_max_age"
// MaxClients.
cfgMaxClientsCount = "max_clients_count"
cfgMaxClientsDeadline = "max_clients_deadline"