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consent_strategy.go
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/
consent_strategy.go
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// Copyright © 2017 Aeneas Rekkas <aeneas+oss@aeneas.io>
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package oauth2
import (
"time"
"net/http"
"github.com/gorilla/sessions"
"github.com/ory/fosite"
"github.com/ory/fosite/handler/openid"
ejwt "github.com/ory/fosite/token/jwt"
"github.com/pborman/uuid"
"github.com/pkg/errors"
)
const (
CookieCSRFKey = "consent_csrf"
)
type DefaultConsentStrategy struct {
Issuer string
DefaultIDTokenLifespan time.Duration
DefaultChallengeLifespan time.Duration
ConsentManager ConsentRequestManager
}
func (s *DefaultConsentStrategy) ValidateConsentRequest(req fosite.AuthorizeRequester, session string, cookie *sessions.Session) (claims *Session, err error) {
consent, err := s.ConsentManager.GetConsentRequest(session)
if err != nil {
return nil, errors.WithStack(err)
}
if !consent.IsConsentGranted() {
err := errors.New("The resource owner denied consent for this request")
return nil, &fosite.RFC6749Error{
Name: "rejected_consent_request",
Description: consent.DenyReason,
Debug: err.Error(),
Hint: consent.DenyReason,
Code: http.StatusUnauthorized,
}
}
if time.Now().After(consent.ExpiresAt) {
return nil, errors.Errorf("Token expired")
}
if consent.ClientID != req.GetClient().GetID() {
return nil, errors.Errorf("ClientID mismatch")
}
if consent.Subject == "" {
return nil, errors.Errorf("Subject key is empty or undefined in consent response, check your payload.")
}
if j, ok := cookie.Values[CookieCSRFKey]; !ok {
return nil, errors.Errorf("Session cookie is missing anti-replay token")
} else if js, ok := j.(string); !ok {
return nil, errors.Errorf("Session cookie anti-replay value is not a string")
} else if js != consent.CSRF {
return nil, errors.Errorf("Session cookie anti-replay value does not match value from consent response")
}
for _, scope := range consent.GrantedScopes {
req.GrantScope(scope)
}
delete(cookie.Values, CookieCSRFKey)
return &Session{
DefaultSession: &openid.DefaultSession{
Claims: &ejwt.IDTokenClaims{
Audience: req.GetClient().GetID(),
Subject: consent.Subject,
Issuer: s.Issuer,
IssuedAt: time.Now(),
ExpiresAt: time.Now().Add(s.DefaultIDTokenLifespan),
Extra: consent.IDTokenExtra,
},
// required for lookup on jwk endpoint
Headers: &ejwt.Headers{Extra: map[string]interface{}{"kid": "public"}},
Subject: consent.Subject,
},
Extra: consent.AccessTokenExtra,
}, err
}
func (s *DefaultConsentStrategy) CreateConsentRequest(req fosite.AuthorizeRequester, redirectURL string, cookie *sessions.Session) (string, error) {
csrf := uuid.New()
id := uuid.New()
cookie.Values[CookieCSRFKey] = csrf
consent := &ConsentRequest{
ID: id,
CSRF: csrf,
GrantedScopes: []string{},
RequestedScopes: req.GetRequestedScopes(),
ClientID: req.GetClient().GetID(),
ExpiresAt: time.Now().Add(s.DefaultChallengeLifespan),
RedirectURL: redirectURL + "&consent=" + id,
AccessTokenExtra: map[string]interface{}{},
IDTokenExtra: map[string]interface{}{},
}
if err := s.ConsentManager.PersistConsentRequest(consent); err != nil {
return "", errors.WithStack(err)
}
return id, nil
}