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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 (
// AuthorizeImplicitGrantTypeHandler is a response handler for the Authorize Code grant using the implicit grant type
// as defined in
type AuthorizeImplicitGrantTypeHandler struct {
AccessTokenStrategy AccessTokenStrategy
// AccessTokenStorage is used to persist session data across requests.
AccessTokenStorage AccessTokenStorage
// AccessTokenLifespan defines the lifetime of an access token.
AccessTokenLifespan time.Duration
ScopeStrategy fosite.ScopeStrategy
AudienceMatchingStrategy fosite.AudienceMatchingStrategy
func (c *AuthorizeImplicitGrantTypeHandler) 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("token") {
return nil
// Disabled because this is already handled at the authorize_request_handler
// if !ar.GetClient().GetResponseTypes().Has("token") {
// return errors.WithStack(fosite.ErrInvalidGrant.WithDebug("The client is not allowed to use response type token"))
// }
if !ar.GetClient().GetGrantTypes().Has("implicit") {
return errors.WithStack(fosite.ErrInvalidGrant.WithHint("The OAuth 2.0 Client is not allowed to use the authorization grant \"implicit\"."))
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
// there is no need to check for https, because implicit flow does not require https
return c.IssueImplicitAccessToken(ctx, ar, resp)
func (c *AuthorizeImplicitGrantTypeHandler) IssueImplicitAccessToken(ctx context.Context, ar fosite.AuthorizeRequester, resp fosite.AuthorizeResponder) error {
// Only override expiry if none is set.
if ar.GetSession().GetExpiresAt(fosite.AccessToken).IsZero() {
ar.GetSession().SetExpiresAt(fosite.AccessToken, time.Now().UTC().Add(c.AccessTokenLifespan).Round(time.Second))
// Generate the code
token, signature, err := c.AccessTokenStrategy.GenerateAccessToken(ctx, ar)
if err != nil {
return errors.WithStack(fosite.ErrServerError.WithDebug(err.Error()))
if err := c.AccessTokenStorage.CreateAccessTokenSession(ctx, signature, ar.Sanitize([]string{})); err != nil {
return errors.WithStack(fosite.ErrServerError.WithDebug(err.Error()))
resp.AddFragment("access_token", token)
resp.AddFragment("expires_in", strconv.FormatInt(int64(getExpiresIn(ar, fosite.AccessToken, c.AccessTokenLifespan, time.Now().UTC())/time.Second), 10))
resp.AddFragment("token_type", "bearer")
resp.AddFragment("state", ar.GetState())
resp.AddFragment("scope", strings.Join(ar.GetGrantedScopes(), " "))
return nil
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