85 lines
2.3 KiB
Go
85 lines
2.3 KiB
Go
/*
|
|
Copyright 2021 The Dapr Authors
|
|
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 apns
|
|
|
|
import (
|
|
"sync"
|
|
"time"
|
|
|
|
jwt "github.com/golang-jwt/jwt/v4"
|
|
|
|
"github.com/dapr/kit/logger"
|
|
)
|
|
|
|
// The "issued at" timestamp in the JWT must be within one hour from the
|
|
// APNS server time. I set the expiration time at 55 minutes to ensure that
|
|
// a new certificate gets generated before it gets too close and risking a
|
|
// failure.
|
|
const expirationMinutes = time.Minute * 55
|
|
|
|
type authorizationBuilder struct {
|
|
logger logger.Logger
|
|
mutex sync.RWMutex
|
|
authorizationHeader string
|
|
tokenExpiresAt time.Time
|
|
keyID string
|
|
teamID string
|
|
privateKey interface{}
|
|
}
|
|
|
|
func (a *authorizationBuilder) getAuthorizationHeader() (string, error) {
|
|
authorizationHeader, ok := a.readAuthorizationHeader()
|
|
if ok {
|
|
return authorizationHeader, nil
|
|
}
|
|
|
|
return a.generateAuthorizationHeader()
|
|
}
|
|
|
|
func (a *authorizationBuilder) readAuthorizationHeader() (string, bool) {
|
|
a.mutex.RLock()
|
|
defer a.mutex.RUnlock()
|
|
|
|
if time.Now().After(a.tokenExpiresAt) {
|
|
return "", false
|
|
}
|
|
|
|
return a.authorizationHeader, true
|
|
}
|
|
|
|
func (a *authorizationBuilder) generateAuthorizationHeader() (string, error) {
|
|
a.mutex.Lock()
|
|
defer a.mutex.Unlock()
|
|
|
|
a.logger.Debug("Authorization token expired; generating new token")
|
|
|
|
now := time.Now()
|
|
// TODO: Use jwt.RegisteredClaims instead of jwt.StandardClaims.
|
|
claims := jwt.StandardClaims{ //nolint:staticcheck
|
|
IssuedAt: time.Now().Unix(),
|
|
Issuer: a.teamID,
|
|
}
|
|
token := jwt.NewWithClaims(jwt.SigningMethodES256, claims)
|
|
token.Header["kid"] = a.keyID
|
|
signedToken, err := token.SignedString(a.privateKey)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
|
|
a.authorizationHeader = "bearer " + signedToken
|
|
a.tokenExpiresAt = now.Add(expirationMinutes)
|
|
|
|
return a.authorizationHeader, nil
|
|
}
|