75 lines
1.8 KiB
Go
75 lines
1.8 KiB
Go
// ------------------------------------------------------------
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// Copyright (c) Microsoft Corporation.
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// Licensed under the MIT License.
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// ------------------------------------------------------------
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package apns
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import (
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"sync"
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"time"
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"github.com/dapr/dapr/pkg/logger"
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"github.com/dgrijalva/jwt-go"
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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 interface{}
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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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now := time.Now()
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claims := jwt.StandardClaims{
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IssuedAt: now.Unix(),
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Issuer: a.teamID,
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}
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token := jwt.NewWithClaims(jwt.SigningMethodES256, claims)
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token.Header["kid"] = a.keyID
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signedToken, err := token.SignedString(a.privateKey)
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if err != nil {
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return "", err
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}
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a.authorizationHeader = "bearer " + signedToken
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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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