81 lines
2.3 KiB
Go
81 lines
2.3 KiB
Go
package sftp
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import (
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"net/url"
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"path"
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"strings"
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"github.com/restic/restic/internal/errors"
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"github.com/restic/restic/internal/options"
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)
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// Config collects all information required to connect to an sftp server.
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type Config struct {
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User, Host, Path string
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Layout string `option:"layout" help:"use this backend directory layout (default: auto-detect)"`
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Command string `option:"command" help:"specify command to create sftp connection"`
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}
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func init() {
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options.Register("sftp", Config{})
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}
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// ParseConfig parses the string s and extracts the sftp config. The
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// supported configuration formats are sftp://user@host/directory
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// and sftp:user@host:directory. The directory will be path Cleaned and can
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// be an absolute path if it starts with a '/' (e.g.
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// sftp://user@host//absolute and sftp:user@host:/absolute).
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func ParseConfig(s string) (interface{}, error) {
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var user, host, dir string
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switch {
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case strings.HasPrefix(s, "sftp://"):
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// parse the "sftp://user@host/path" url format
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url, err := url.Parse(s)
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if err != nil {
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return nil, errors.Wrap(err, "url.Parse")
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}
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if url.User != nil {
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user = url.User.Username()
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}
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host = url.Host
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dir = url.Path
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if dir == "" {
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return nil, errors.Errorf("invalid backend %q, no directory specified", s)
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}
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dir = dir[1:]
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case strings.HasPrefix(s, "sftp:"):
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// parse the sftp:user@host:path format, which means we'll get
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// "user@host:path" in s
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s = s[5:]
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// split user@host and path at the colon
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data := strings.SplitN(s, ":", 2)
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if len(data) < 2 {
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return nil, errors.New("sftp: invalid format, hostname or path not found")
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}
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host = data[0]
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dir = data[1]
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// split user and host at the "@"
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data = strings.SplitN(host, "@", 3)
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if len(data) == 3 {
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user = data[0] + "@" + data[1]
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host = data[2]
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} else if len(data) == 2 {
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user = data[0]
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host = data[1]
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}
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default:
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return nil, errors.New(`invalid format, does not start with "sftp:"`)
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}
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p := path.Clean(dir)
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if strings.HasPrefix(p, "~") {
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return nil, errors.Fatal("sftp path starts with the tilde (~) character, that fails for most sftp servers.\nUse a relative directory, most servers interpret this as relative to the user's home directory.")
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}
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return Config{
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User: user,
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Host: host,
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Path: p,
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}, nil
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}
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