Rename URI -> Config/Location

location/location.go

@@ -0,0 +1,66 @@
+// Package location implements parsing the restic repository location from a string.
+package location
+
+import (
+	"strings"
+
+	"github.com/restic/restic/backend/local"
+	"github.com/restic/restic/backend/s3"
+	"github.com/restic/restic/backend/sftp"
+)
+
+// Location specifies the location of a repository, including the method of
+// access and (possibly) credentials needed for access.
+type Location struct {
+	Scheme string
+	Config interface{}
+}
+
+type parser struct {
+	scheme string
+	parse  func(string) (interface{}, error)
+}
+
+// parsers is a list of valid config parsers for the backends. The first parser
+// is the fallback and should always be set to the local backend.
+var parsers = []parser{
+	{"local", local.ParseConfig},
+	{"sftp", sftp.ParseConfig},
+	{"s3", s3.ParseConfig},
+}
+
+// ParseLocation parses a repository location from the string s. If s starts with a
+// backend name followed by a colon, that backend's Parse() function is called.
+// Otherwise, the local backend is used which interprets s as the name of a
+// directory.
+func ParseLocation(s string) (u Location, err error) {
+	scheme := extractScheme(s)
+	u.Scheme = scheme
+
+	for _, parser := range parsers {
+		if parser.scheme != scheme {
+			continue
+		}
+
+		u.Config, err = parser.parse(s)
+		if err != nil {
+			return Location{}, err
+		}
+
+		return u, nil
+	}
+
+	// try again, with the local parser and the prefix "local:"
+	u.Scheme = "local"
+	u.Config, err = local.ParseConfig("local:" + s)
+	if err != nil {
+		return Location{}, err
+	}
+
+	return u, nil
+}
+
+func extractScheme(s string) string {
+	data := strings.SplitN(s, ":", 2)
+	return data[0]
+}