117 lines
2.8 KiB
Go
117 lines
2.8 KiB
Go
/*
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Copyright 2021 The Dapr Authors
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package apns
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import (
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"crypto"
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"errors"
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"fmt"
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"sync"
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"time"
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"github.com/lestrrat-go/jwx/v2/jwa"
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"github.com/lestrrat-go/jwx/v2/jwk"
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"github.com/lestrrat-go/jwx/v2/jwt"
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"github.com/dapr/kit/logger"
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)
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// The "issued at" timestamp in the JWT must be within one hour from the
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// APNS server time. I set the expiration time at 55 minutes to ensure that
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// a new certificate gets generated before it gets too close and risking a
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// failure.
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const expirationMinutes = time.Minute * 55
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type authorizationBuilder struct {
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logger logger.Logger
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mutex sync.RWMutex
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authorizationHeader string
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tokenExpiresAt time.Time
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keyID string
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teamID string
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privateKey crypto.PrivateKey
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pk jwk.Key
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}
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func (a *authorizationBuilder) setPK() error {
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if a.privateKey == nil {
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return errors.New("privateKey property is nil")
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}
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if a.keyID == "" {
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return errors.New("keyID property is nil")
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}
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pk, err := jwk.FromRaw(a.privateKey)
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if err != nil {
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return fmt.Errorf("failed to parse private key: %w", err)
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}
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pk.Set("kid", a.keyID)
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a.pk = pk
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return nil
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}
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func (a *authorizationBuilder) getAuthorizationHeader() (string, error) {
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authorizationHeader, ok := a.readAuthorizationHeader()
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if ok {
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return authorizationHeader, nil
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}
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return a.generateAuthorizationHeader()
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}
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func (a *authorizationBuilder) readAuthorizationHeader() (string, bool) {
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a.mutex.RLock()
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defer a.mutex.RUnlock()
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if time.Now().After(a.tokenExpiresAt) {
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return "", false
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}
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return a.authorizationHeader, true
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}
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func (a *authorizationBuilder) generateAuthorizationHeader() (string, error) {
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a.mutex.Lock()
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defer a.mutex.Unlock()
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a.logger.Debug("Authorization token expired; generating new token")
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var err error
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if a.pk == nil {
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err = a.setPK()
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if err != nil {
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return "", err
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}
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}
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now := time.Now()
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token, err := jwt.NewBuilder().
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Issuer(a.teamID).
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IssuedAt(now).
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Build()
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if err != nil {
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return "", fmt.Errorf("failed to build token: %w", err)
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}
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signed, err := jwt.Sign(token, jwt.WithKey(jwa.ES256, a.pk))
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if err != nil {
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return "", fmt.Errorf("failed to sign token: %w", err)
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}
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a.authorizationHeader = "bearer " + string(signed)
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a.tokenExpiresAt = now.Add(expirationMinutes)
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return a.authorizationHeader, nil
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}
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