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restic/internal/backend/gs/config.go
2023-06-07 22:30:35 +02:00

68 lines
1.7 KiB
Go

package gs
import (
"os"
"path"
"strings"
"github.com/restic/restic/internal/errors"
"github.com/restic/restic/internal/options"
)
// Config contains all configuration necessary to connect to a Google Cloud Storage
// bucket. We use Google's default application credentials to acquire an access token, so
// we don't require that calling code supply any authentication material here.
type Config struct {
ProjectID string
Bucket string
Prefix string
Connections uint `option:"connections" help:"set a limit for the number of concurrent connections (default: 5)"`
Region string `option:"region" help:"region to create the bucket in (default: us)"`
}
// NewConfig returns a new Config with the default values filled in.
func NewConfig() Config {
return Config{
Connections: 5,
Region: "us",
}
}
func init() {
options.Register("gs", Config{})
}
// ParseConfig parses the string s and extracts the gcs config. The
// supported configuration format is gs:bucketName:/[prefix].
func ParseConfig(s string) (Config, error) {
if !strings.HasPrefix(s, "gs:") {
return Config{}, errors.New("gs: invalid format")
}
// strip prefix "gs:"
s = s[3:]
// use the first entry of the path as the bucket name and the
// remainder as prefix
bucket, prefix, colon := strings.Cut(s, ":")
if !colon {
return Config{}, errors.New("gs: invalid format: bucket name or path not found")
}
prefix = strings.TrimPrefix(path.Clean(prefix), "/")
cfg := NewConfig()
cfg.Bucket = bucket
cfg.Prefix = prefix
return cfg, nil
}
// ApplyEnvironment saves values from the environment to the config.
func ApplyEnvironment(cfgRaw interface{}) error {
cfg := cfgRaw.(*Config)
if cfg.ProjectID == "" {
cfg.ProjectID = os.Getenv("GOOGLE_PROJECT_ID")
}
return nil
}