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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,97 @@ | ||
| package authentication | ||
|
|
||
| import ( | ||
| "context" | ||
| "sync" | ||
| "time" | ||
|
|
||
| authenticationv1 "k8s.io/api/authentication/v1" | ||
| metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" | ||
| "k8s.io/apimachinery/pkg/types" | ||
| corev1client "k8s.io/client-go/kubernetes/typed/core/v1" | ||
| "k8s.io/utils/ptr" | ||
| ) | ||
|
|
||
| type TokenGetter struct { | ||
| client corev1client.ServiceAccountsGetter | ||
| expirationSeconds int64 | ||
| tokens map[types.NamespacedName]*authenticationv1.TokenRequestStatus | ||
| tokenLocks keyLock[types.NamespacedName] | ||
| mu sync.RWMutex | ||
| } | ||
|
|
||
| func NewTokenGetter(client corev1client.ServiceAccountsGetter, expirationSeconds int64) *TokenGetter { | ||
| return &TokenGetter{ | ||
| client: client, | ||
| expirationSeconds: expirationSeconds, | ||
| tokenLocks: newKeyLock[types.NamespacedName](), | ||
| tokens: map[types.NamespacedName]*authenticationv1.TokenRequestStatus{}, | ||
| } | ||
| } | ||
|
|
||
| type keyLock[K comparable] struct { | ||
| locks map[K]*sync.Mutex | ||
| mu sync.Mutex | ||
| } | ||
|
|
||
| func newKeyLock[K comparable]() keyLock[K] { | ||
| return keyLock[K]{locks: map[K]*sync.Mutex{}} | ||
| } | ||
|
|
||
| func (k *keyLock[K]) Lock(key K) { | ||
| k.getLock(key).Lock() | ||
| } | ||
|
|
||
| func (k *keyLock[K]) Unlock(key K) { | ||
| k.getLock(key).Unlock() | ||
| } | ||
|
|
||
| func (k *keyLock[K]) getLock(key K) *sync.Mutex { | ||
| k.mu.Lock() | ||
| defer k.mu.Unlock() | ||
|
|
||
| lock, ok := k.locks[key] | ||
| if !ok { | ||
| lock = &sync.Mutex{} | ||
| k.locks[key] = lock | ||
| } | ||
| return lock | ||
| } | ||
|
|
||
| func (t *TokenGetter) Get(ctx context.Context, key types.NamespacedName) (string, error) { | ||
| t.tokenLocks.Lock(key) | ||
| defer t.tokenLocks.Unlock(key) | ||
|
|
||
| t.mu.RLock() | ||
| token, ok := t.tokens[key] | ||
| t.mu.RUnlock() | ||
|
|
||
| expireTime := time.Time{} | ||
| if ok { | ||
| expireTime = token.ExpirationTimestamp.Time | ||
| } | ||
|
|
||
| fiveMinutesAfterNow := metav1.Now().Add(5 * time.Minute) | ||
| if expireTime.Before(fiveMinutesAfterNow) { | ||
| var err error | ||
| token, err = t.getToken(ctx, key) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| t.mu.Lock() | ||
| t.tokens[key] = token | ||
| t.mu.Unlock() | ||
| } | ||
|
|
||
| return token.Token, nil | ||
| } | ||
|
|
||
| func (t *TokenGetter) getToken(ctx context.Context, key types.NamespacedName) (*authenticationv1.TokenRequestStatus, error) { | ||
| req, err := t.client.ServiceAccounts(key.Namespace).CreateToken(ctx, key.Name, &authenticationv1.TokenRequest{Spec: authenticationv1.TokenRequestSpec{ | ||
| ExpirationSeconds: ptr.To[int64](3600), | ||
| }}, metav1.CreateOptions{}) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return &req.Status, nil | ||
| } |
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