first working version

variables.go

@@ -0,0 +1,49 @@
+package main
+
+import (
+	"errors"
+	"regexp"
+	"strings"
+
+	"github.com/restic/restic/backend"
+)
+
+// Returns the repository name for a given path
+func RepositoryName(u string) (string, error) {
+	s := strings.Split(u, "/")
+	if len(s) <= 1 {
+		return "", errors.New("path does not contain repository name")
+	}
+	return ParseRepositoryName(s[1])
+}
+
+func ParseRepositoryName(n string) (string, error) {
+	if len(n) < 1 {
+		return "", errors.New("repository name should contain at least 1 character")
+	}
+	match, err := regexp.MatchString("^[a-zA-Z0-9_-]*$", n)
+	if !match || err != nil {
+		return "", errors.New("repository name should not contains special characters")
+	}
+	return n, nil
+}
+
+// Returns the backend type for a given path
+func BackendType(u string) backend.Type {
+	s := strings.Split(u, "/")
+	var bt backend.Type
+	if len(s) > 2 {
+		bt, _ = backend.ParseType(s[2])
+	}
+	return bt
+}
+
+// Returns the blob ID for a given path
+func BlobID(u string) backend.ID {
+	s := strings.Split(u, "/")
+	var id backend.ID
+	if len(s) > 3 {
+		id, _ = backend.ParseID(s[3])
+	}
+	return id
+}