/
secret_cache.go
152 lines (125 loc) · 3.59 KB
/
secret_cache.go
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package gcp
import (
"context"
"encoding/json"
"fmt"
secretmanager "cloud.google.com/go/secretmanager/apiv1"
"cloud.google.com/go/secretmanager/apiv1/secretmanagerpb"
"github.com/go-logr/logr"
"github.com/go-logr/zapr"
"github.com/pkg/errors"
"go.uber.org/zap"
"golang.org/x/oauth2"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
// SecretCache implements a cache for an OAuth2 credential using GCP secret manager
type SecretCache struct {
client *secretmanager.Client
Project string
Secret string
Version string
Log logr.Logger
}
func NewSecretCache(project string, secret string, version string) (*SecretCache, error) {
c := &SecretCache{
Project: project,
Secret: secret,
Version: version,
Log: zapr.NewLogger(zap.L()),
}
client, err := secretmanager.NewClient(context.Background())
if err != nil {
return nil, err
}
c.client = client
return c, nil
}
func (c *SecretCache) GetToken() (*oauth2.Token, error) {
payload, err := c.loadSecret()
if err != nil {
return nil, err
}
// No secret has been saved yet.
if payload == nil {
return nil, nil
}
tok := &oauth2.Token{}
err = json.Unmarshal(payload, tok)
return tok, err
}
// Save saves a token to a file path.
func (c *SecretCache) Save(token *oauth2.Token) error {
log := c.Log
log.Info("Saving credential to secret manager", "project", c.Project, "secret", c.Secret)
// Create the request to create the secret.
createSecretReq := &secretmanagerpb.CreateSecretRequest{
Parent: fmt.Sprintf("projects/%s", c.Project),
SecretId: c.Secret,
Secret: &secretmanagerpb.Secret{
Replication: &secretmanagerpb.Replication{
Replication: &secretmanagerpb.Replication_Automatic_{
Automatic: &secretmanagerpb.Replication_Automatic{},
},
},
},
}
ctx := context.Background()
_, err := c.client.CreateSecret(ctx, createSecretReq)
if err != nil {
status, ok := status.FromError(err)
if !ok {
log.Error(err, "Error creating secret.", "project", c.Project, "secret", c.Secret)
return err
}
if status.Code() == codes.AlreadyExists {
log.Info("Secret exists", "project", c.Project, "secret", c.Secret)
} else {
log.Error(err, "Error creating secret.", "project", c.Project, "secret", c.Secret)
return err
}
}
payload, err := json.Marshal(token)
if err != nil {
return err
}
// Build the request.
addSecretVersionReq := &secretmanagerpb.AddSecretVersionRequest{
Parent: fmt.Sprintf("projects/%v/secrets/%v", c.Project, c.Secret),
Payload: &secretmanagerpb.SecretPayload{
Data: payload,
},
}
// Call the API.
version, err := c.client.AddSecretVersion(ctx, addSecretVersionReq)
if err != nil {
return err
}
log.Info("Stored token in secret manager,", "version", version)
return nil
}
func (c *SecretCache) loadSecret() ([]byte, error) {
log := c.Log
name := fmt.Sprintf("projects/%v/secrets/%v/versions/%s", c.Project, c.Secret, c.Version)
accessRequest := &secretmanagerpb.AccessSecretVersionRequest{
Name: name,
}
ctx := context.Background()
// Call the API.
result, err := c.client.AccessSecretVersion(ctx, accessRequest)
if err != nil {
status, ok := status.FromError(err)
if ok {
if status.Code() == codes.NotFound {
log.Info("No secret exists containing cached token", "secret", name)
return nil, nil
}
if status.Code() == codes.FailedPrecondition {
log.Info("Latest version of secret is not valid a new secret will be created.", "secret", name, "status_message", status.Message())
return nil, nil
}
}
return nil, errors.Wrapf(err, "failed to access secret %v", name)
}
return result.Payload.Data, nil
}