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* Copyright © 2015-2018 Aeneas Rekkas <>
* 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
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* See the License for the specific language governing permissions and
* limitations under the License.
* @author Aeneas Rekkas <>
* @copyright 2015-2018 Aeneas Rekkas <>
* @license Apache-2.0
package oauth2
import (
// AuthorizeExplicitGrantTypeHandler is a response handler for the Authorize Code grant using the explicit grant type
// as defined in
type AuthorizeExplicitGrantHandler struct {
AccessTokenStrategy AccessTokenStrategy
RefreshTokenStrategy RefreshTokenStrategy
AuthorizeCodeStrategy AuthorizeCodeStrategy
CoreStorage CoreStorage
//TokenRevocationStorage TokenRevocationStorage
// AuthCodeLifespan defines the lifetime of an authorize code.
AuthCodeLifespan time.Duration
// AccessTokenLifespan defines the lifetime of an access token.
AccessTokenLifespan time.Duration
// RefreshTokenLifespan defines the lifetime of a refresh token. Leave to 0 for unlimited lifetime.
RefreshTokenLifespan time.Duration
ScopeStrategy fosite.ScopeStrategy
AudienceMatchingStrategy fosite.AudienceMatchingStrategy
// SanitationWhiteList is a whitelist of form values that are required by the token endpoint. These values
// are safe for storage in a database (cleartext).
SanitationWhiteList []string
TokenRevocationStorage TokenRevocationStorage
IsRedirectURISecure func(*url.URL) bool
RefreshTokenScopes []string
func (c *AuthorizeExplicitGrantHandler) secureChecker() func(*url.URL) bool {
if c.IsRedirectURISecure == nil {
c.IsRedirectURISecure = fosite.IsRedirectURISecure
return c.IsRedirectURISecure
func (c *AuthorizeExplicitGrantHandler) HandleAuthorizeEndpointRequest(ctx context.Context, ar fosite.AuthorizeRequester, resp fosite.AuthorizeResponder) error {
// This let's us define multiple response types, for example open id connect's id_token
if !ar.GetResponseTypes().Exact("code") {
return nil
// Disabled because this is already handled at the authorize_request_handler
// if !ar.GetClient().GetResponseTypes().Has("code") {
// return errors.WithStack(fosite.ErrInvalidGrant)
// }
if !c.secureChecker()(ar.GetRedirectURI()) {
return errors.WithStack(fosite.ErrInvalidRequest.WithHint("Redirect URL is using an insecure protocol, http is only allowed for hosts with suffix `localhost`, for example: http://myapp.localhost/."))
client := ar.GetClient()
for _, scope := range ar.GetRequestedScopes() {
if !c.ScopeStrategy(client.GetScopes(), scope) {
return errors.WithStack(fosite.ErrInvalidScope.WithHintf("The OAuth 2.0 Client is not allowed to request scope \"%s\".", scope))
if err := c.AudienceMatchingStrategy(client.GetAudience(), ar.GetRequestedAudience()); err != nil {
return err
return c.IssueAuthorizeCode(ctx, ar, resp)
func (c *AuthorizeExplicitGrantHandler) IssueAuthorizeCode(ctx context.Context, ar fosite.AuthorizeRequester, resp fosite.AuthorizeResponder) error {
code, signature, err := c.AuthorizeCodeStrategy.GenerateAuthorizeCode(ctx, ar)
if err != nil {
return errors.WithStack(fosite.ErrServerError.WithDebug(err.Error()))
ar.GetSession().SetExpiresAt(fosite.AuthorizeCode, time.Now().UTC().Add(c.AuthCodeLifespan))
if err := c.CoreStorage.CreateAuthorizeCodeSession(ctx, signature, ar.Sanitize(c.GetSanitationWhiteList())); err != nil {
return errors.WithStack(fosite.ErrServerError.WithDebug(err.Error()))
resp.AddQuery("code", code)
resp.AddQuery("state", ar.GetState())
resp.AddQuery("scope", strings.Join(ar.GetGrantedScopes(), " "))
return nil
func (c *AuthorizeExplicitGrantHandler) GetSanitationWhiteList() []string {
if len(c.SanitationWhiteList) > 0 {
return c.SanitationWhiteList
return []string{
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