|
| 1 | +package token |
| 2 | + |
| 3 | +import ( |
| 4 | + "context" |
| 5 | + cryptorand "crypto/rand" |
| 6 | + "encoding/base64" |
| 7 | + "fmt" |
| 8 | + |
| 9 | + corev1 "k8s.io/api/core/v1" |
| 10 | + apierrors "k8s.io/apimachinery/pkg/api/errors" |
| 11 | + metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" |
| 12 | + clusterv1 "sigs.k8s.io/cluster-api/api/v1beta1" |
| 13 | + "sigs.k8s.io/controller-runtime/pkg/client" |
| 14 | +) |
| 15 | + |
| 16 | +const ( |
| 17 | + AuthTokenNameSuffix = "capi-auth-token" |
| 18 | +) |
| 19 | + |
| 20 | +// Reconcile ensures that a token secret exists for the given cluster. |
| 21 | +func Reconcile(ctx context.Context, c client.Client, clusterKey client.ObjectKey) error { |
| 22 | + if _, err := getSecret(ctx, c, clusterKey); err != nil { |
| 23 | + if apierrors.IsNotFound(err) { |
| 24 | + if _, err := generateAndStore(ctx, c, clusterKey); err != nil { |
| 25 | + return fmt.Errorf("failed to generate and store token: %w", err) |
| 26 | + } |
| 27 | + return nil |
| 28 | + } |
| 29 | + } |
| 30 | + |
| 31 | + return nil |
| 32 | +} |
| 33 | + |
| 34 | +// Lookup retrieves the token for the given cluster. |
| 35 | +func Lookup(ctx context.Context, c client.Client, clusterKey client.ObjectKey) (string, error) { |
| 36 | + secret, err := getSecret(ctx, c, clusterKey) |
| 37 | + if err != nil { |
| 38 | + return "", fmt.Errorf("failed to get secret: %w", err) |
| 39 | + } |
| 40 | + |
| 41 | + v, ok := secret.Data["token"] |
| 42 | + if !ok { |
| 43 | + return "", fmt.Errorf("token not found in secret") |
| 44 | + } |
| 45 | + |
| 46 | + return string(v), nil |
| 47 | +} |
| 48 | + |
| 49 | +// authTokenName returns the name of the auth-token secret, computed by convention using the name of the cluster. |
| 50 | +func authTokenName(clusterName string) string { |
| 51 | + return fmt.Sprintf("%s-%s", clusterName, AuthTokenNameSuffix) |
| 52 | +} |
| 53 | + |
| 54 | +// getSecret retrieves the token secret for the given cluster. |
| 55 | +func getSecret(ctx context.Context, c client.Client, clusterKey client.ObjectKey) (*corev1.Secret, error) { |
| 56 | + s := &corev1.Secret{} |
| 57 | + key := client.ObjectKey{ |
| 58 | + Name: authTokenName(clusterKey.Name), |
| 59 | + Namespace: clusterKey.Namespace, |
| 60 | + } |
| 61 | + if err := c.Get(ctx, key, s); err != nil { |
| 62 | + return nil, fmt.Errorf("failed to get secret: %w", err) |
| 63 | + } |
| 64 | + |
| 65 | + return s, nil |
| 66 | +} |
| 67 | + |
| 68 | +// generateAndStore generates a new token and stores it in a secret. |
| 69 | +func generateAndStore(ctx context.Context, c client.Client, clusterKey client.ObjectKey) (*corev1.Secret, error) { |
| 70 | + token, err := randomB64(16) |
| 71 | + if err != nil { |
| 72 | + return nil, fmt.Errorf("failed to generate token: %w", err) |
| 73 | + } |
| 74 | + |
| 75 | + secret := &corev1.Secret{ |
| 76 | + ObjectMeta: metav1.ObjectMeta{ |
| 77 | + Namespace: clusterKey.Namespace, |
| 78 | + Name: authTokenName(clusterKey.Name), |
| 79 | + }, |
| 80 | + Data: map[string][]byte{ |
| 81 | + "token": []byte(token), |
| 82 | + }, |
| 83 | + Type: clusterv1.ClusterSecretType, |
| 84 | + } |
| 85 | + |
| 86 | + if err := c.Create(ctx, secret); err != nil { |
| 87 | + return nil, fmt.Errorf("failed to create secret: %w", err) |
| 88 | + } |
| 89 | + |
| 90 | + return secret, nil |
| 91 | +} |
| 92 | + |
| 93 | +// randomB64 generates a random base64 string of n bytes. |
| 94 | +func randomB64(n int) (string, error) { |
| 95 | + b := make([]byte, n) |
| 96 | + _, err := cryptorand.Read(b) |
| 97 | + if err != nil { |
| 98 | + return "", fmt.Errorf("failed to read random bytes: %w", err) |
| 99 | + } |
| 100 | + return base64.StdEncoding.EncodeToString(b), nil |
| 101 | +} |
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