restic/backend/s3/config.go

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package s3
import (
"errors"
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"net/url"
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"strings"
)
// Config contains all configuration necessary to connect to an s3 compatible
// server.
type Config struct {
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Endpoint string
UseHTTP bool
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KeyID, Secret string
Bucket string
Prefix string
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}
const defaultPrefix = "restic"
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// ParseConfig parses the string s and extracts the s3 config. The two
// supported configuration formats are s3://host/bucketname/prefix and
// s3:host:bucketname/prefix. The host can also be a valid s3 region
// name. If no prefix is given the prefix "restic" will be used.
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func ParseConfig(s string) (interface{}, error) {
var path []string
cfg := Config{}
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if strings.HasPrefix(s, "s3://") {
s = s[5:]
path = strings.SplitN(s, "/", 3)
cfg.Endpoint = path[0]
path = path[1:]
} else if strings.HasPrefix(s, "s3:http") {
s = s[3:]
// assume that a URL has been specified, parse it and
// use the host as the endpoint and the path as the
// bucket name and prefix
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url, err := url.Parse(s)
if err != nil {
return nil, err
}
if url.Path == "" {
return nil, errors.New("s3: bucket name not found")
}
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cfg.Endpoint = url.Host
if url.Scheme == "http" {
cfg.UseHTTP = true
}
path = strings.SplitN(url.Path[1:], "/", 2)
} else if strings.HasPrefix(s, "s3:") {
s = s[3:]
path = strings.SplitN(s, "/", 3)
cfg.Endpoint = path[0]
path = path[1:]
} else {
return nil, errors.New("s3: invalid format")
}
if len(path) < 1 {
return nil, errors.New("s3: invalid format, host/region or bucket name not found")
}
cfg.Bucket = path[0]
if len(path) > 1 {
cfg.Prefix = path[1]
} else {
cfg.Prefix = defaultPrefix
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}
return cfg, nil
}