/
keys.go
147 lines (120 loc) · 3 KB
/
keys.go
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package main
import (
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"encoding/base64"
"encoding/json"
"io"
"net/http"
"github.com/lestrrat-go/jwx/v2/jwk"
"go.uber.org/fx"
"go.uber.org/zap"
)
type KeySetHandler struct {
l *zap.Logger
set jwk.Set
}
func (ksh KeySetHandler) ServeHTTP(response http.ResponseWriter, request *http.Request) {
body, err := json.Marshal(ksh.set)
if err != nil {
ksh.l.Error("unable to marshal JWK set", zap.Error(err))
response.WriteHeader(http.StatusInternalServerError)
return
}
JWKSetMediaType.SetContentType(response.Header())
response.Write(body)
}
type KeyHandler struct {
l *zap.Logger
key jwk.Key
}
func (kh KeyHandler) ServeHTTP(response http.ResponseWriter, request *http.Request) {
responseMediaType := JWKMediaType
if accept := request.Header.Get("Accept"); len(accept) > 0 {
acceptMediaType, params, err := ParseMediaType(accept)
switch {
case err != nil:
kh.l.Error("invalid Accept header", zap.Error(err))
response.WriteHeader(http.StatusBadRequest)
return
case len(params) > 0:
kh.l.Error("parameters aren't supported in the Accept header")
response.WriteHeader(http.StatusUnsupportedMediaType)
return
case acceptMediaType == JWKMediaType:
fallthrough
case acceptMediaType == PEMMediaType:
responseMediaType = acceptMediaType
case acceptMediaType == "*/*":
fallthrough
case acceptMediaType == "application/*":
responseMediaType = JWKMediaType
default:
kh.l.Error("unsupported media type", zap.String("acceptMediaType", string(acceptMediaType)))
response.WriteHeader(http.StatusUnsupportedMediaType)
return
}
}
var (
body []byte
err error
)
switch responseMediaType {
case JWKMediaType:
body, err = json.Marshal(kh.key)
default:
body, err = jwk.EncodePEM(kh.key)
}
if err != nil {
kh.l.Error("unable to encode key", zap.Error(err))
response.WriteHeader(http.StatusInternalServerError)
return
}
responseMediaType.SetContentType(response.Header())
response.Write(body)
}
func provideKey() fx.Option {
return fx.Options(
fx.Provide(
func(l *zap.Logger) (key jwk.Key, err error) {
var (
pk *ecdsa.PrivateKey
kid [16]byte
)
pk, err = ecdsa.GenerateKey(elliptic.P521(), rand.Reader)
if err == nil {
key, err = jwk.FromRaw(pk)
}
if err == nil {
_, err = io.ReadFull(rand.Reader, kid[:])
}
if err == nil {
kidString := base64.RawURLEncoding.EncodeToString(kid[:])
l.Info("generated key", zap.String("kid", kidString))
err = key.Set(jwk.KeyIDKey, kidString)
}
return
},
func(l *zap.Logger, key jwk.Key) (kh KeyHandler, err error) {
var pub jwk.Key
pub, err = key.PublicKey()
if err == nil {
kh.l = l
kh.key = pub
}
return
},
func(l *zap.Logger, key jwk.Key) (khs KeySetHandler, err error) {
var pub jwk.Key
pub, err = key.PublicKey()
if err == nil {
khs.l = l
khs.set = jwk.NewSet()
err = khs.set.AddKey(pub)
}
return
},
),
)
}