strategy_hmacsha.go

// 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"

	"context"
	"fmt"

	"github.com/ory/fosite"
	enigma "github.com/ory/fosite/token/hmac"
	"github.com/pkg/errors"
)

type HMACSHAStrategy struct {
	Enigma                *enigma.HMACStrategy
	AccessTokenLifespan   time.Duration
	AuthorizeCodeLifespan time.Duration
}

func (h HMACSHAStrategy) AccessTokenSignature(token string) string {
	return h.Enigma.Signature(token)
}
func (h HMACSHAStrategy) RefreshTokenSignature(token string) string {
	return h.Enigma.Signature(token)
}
func (h HMACSHAStrategy) AuthorizeCodeSignature(token string) string {
	return h.Enigma.Signature(token)
}

func (h HMACSHAStrategy) GenerateAccessToken(_ context.Context, _ fosite.Requester) (token string, signature string, err error) {
	return h.Enigma.Generate()
}

func (h HMACSHAStrategy) ValidateAccessToken(_ context.Context, r fosite.Requester, token string) (err error) {
	var exp = r.GetSession().GetExpiresAt(fosite.AccessToken)
	if exp.IsZero() && r.GetRequestedAt().Add(h.AccessTokenLifespan).Before(time.Now().UTC()) {
		return errors.WithStack(fosite.ErrTokenExpired.WithDebug(fmt.Sprintf("Access token expired at %s", r.GetRequestedAt().Add(h.AccessTokenLifespan))))
	}
	if !exp.IsZero() && exp.Before(time.Now().UTC()) {
		return errors.WithStack(fosite.ErrTokenExpired.WithDebug(fmt.Sprintf("Access token expired at %s", exp)))
	}
	return h.Enigma.Validate(token)
}

func (h HMACSHAStrategy) GenerateRefreshToken(_ context.Context, _ fosite.Requester) (token string, signature string, err error) {
	return h.Enigma.Generate()
}

func (h HMACSHAStrategy) ValidateRefreshToken(_ context.Context, _ fosite.Requester, token string) (err error) {
	return h.Enigma.Validate(token)
}

func (h HMACSHAStrategy) GenerateAuthorizeCode(_ context.Context, _ fosite.Requester) (token string, signature string, err error) {
	return h.Enigma.Generate()
}

func (h HMACSHAStrategy) ValidateAuthorizeCode(_ context.Context, r fosite.Requester, token string) (err error) {
	var exp = r.GetSession().GetExpiresAt(fosite.AuthorizeCode)
	if exp.IsZero() && r.GetRequestedAt().Add(h.AuthorizeCodeLifespan).Before(time.Now().UTC()) {
		return errors.WithStack(fosite.ErrTokenExpired.WithDebug(fmt.Sprintf("Authorize code expired at %s", r.GetRequestedAt().Add(h.AuthorizeCodeLifespan))))
	}
	if !exp.IsZero() && exp.Before(time.Now().UTC()) {
		return errors.WithStack(fosite.ErrTokenExpired.WithDebug(fmt.Sprintf("Authorize code expired at %s", exp)))
	}

	return h.Enigma.Validate(token)
}