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jwt_bearer.go
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jwt_bearer.go
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// Copyright © 2023 Ory Corp
// SPDX-License-Identifier: Apache-2.0
package clients
import (
"context"
"crypto/rsa"
"encoding/json"
"io"
"net/http"
"net/url"
"strings"
"github.com/go-jose/go-jose/v4"
"github.com/go-jose/go-jose/v4/jwt"
"authelia.com/provider/oauth2/internal/consts"
)
type JWTBearer struct {
tokenURL string
header *Header //nolint:unused
client *http.Client
Signer jose.Signer
}
type Token struct {
AccessToken string `json:"access_token"`
TokenType string `json:"token_type,omitempty"`
RefreshToken string `json:"refresh_token,omitempty"`
ExpiresIn int64 `json:"expires_in,omitempty"`
}
type Header struct {
Algorithm string `json:"alg"`
Typ string `json:"typ"`
KeyID string `json:"kid,omitempty"`
}
type JWTBearerPayload struct {
*jwt.Claims
PrivateClaims map[string]any
}
func (c *JWTBearer) SetPrivateKey(keyID string, privateKey *rsa.PrivateKey) error {
jwk := jose.JSONWebKey{Key: privateKey, KeyID: keyID, Algorithm: string(jose.RS256)}
signingKey := jose.SigningKey{
Algorithm: jose.RS256,
Key: jwk,
}
signerOptions := &jose.SignerOptions{}
signerOptions.WithType("JWT")
sig, err := jose.NewSigner(signingKey, signerOptions)
if err != nil {
return err
}
c.Signer = sig
return nil
}
func (c *JWTBearer) GetToken(ctx context.Context, payloadData *JWTBearerPayload, scope []string) (*Token, error) {
builder := jwt.Signed(c.Signer).
Claims(payloadData.Claims).
Claims(payloadData.PrivateClaims)
assertion, err := builder.Serialize()
if err != nil {
return nil, err
}
requestBodyReader, err := c.getRequestBodyReader(assertion, scope)
if err != nil {
return nil, err
}
request, err := http.NewRequestWithContext(ctx, http.MethodPost, c.tokenURL, requestBodyReader)
if err != nil {
return nil, err
}
request.Header.Set(consts.HeaderContentType, consts.ContentTypeApplicationURLEncodedForm)
response, err := c.client.Do(request)
if err != nil {
return nil, err
}
defer response.Body.Close()
body, err := io.ReadAll(response.Body)
if err != nil {
return nil, err
}
if c := response.StatusCode; c < 200 || c > 299 {
return nil, &RequestError{
Response: response,
Body: body,
}
}
token := &Token{}
if err = json.Unmarshal(body, token); err != nil {
return nil, err
}
return token, err
}
//nolint:unparam
func (c *JWTBearer) getRequestBodyReader(assertion string, scope []string) (io.Reader, error) {
data := url.Values{}
data.Set(consts.FormParameterGrantType, consts.GrantTypeOAuthJWTBearer)
data.Set(consts.FormParameterAssertion, assertion)
if len(scope) != 0 {
data.Set(consts.FormParameterScope, strings.Join(scope, " "))
}
return strings.NewReader(data.Encode()), nil
}
func NewJWTBearer(tokenURL string) *JWTBearer {
return &JWTBearer{
client: &http.Client{},
tokenURL: tokenURL,
}
}