Add repository location parsing code

backend/s3/uri.go

@@ -0,0 +1,51 @@
+package s3
+
+import (
+	"errors"
+	"strings"
+)
+
+// Config contains all configuration necessary to connect to an s3 compatible
+// server.
+type Config struct {
+	Host          string
+	KeyID, Secret string
+	Bucket        string
+}
+
+// ParseConfig parses the string s and extracts the s3 config. The two
+// supported configuration formats are s3://host/bucketname and
+// s3:host:bucketname. The host can also be a valid s3 region name.
+func ParseConfig(s string) (interface{}, error) {
+	if strings.HasPrefix(s, "s3://") {
+		s = s[5:]
+
+		data := strings.SplitN(s, "/", 2)
+		if len(data) != 2 {
+			return nil, errors.New("s3: invalid format, host/region or bucket name not found")
+		}
+
+		cfg := Config{
+			Host:   data[0],
+			Bucket: data[1],
+		}
+
+		return cfg, nil
+	}
+
+	data := strings.SplitN(s, ":", 3)
+	if len(data) != 3 {
+		return nil, errors.New("s3: invalid format")
+	}
+
+	if data[0] != "s3" {
+		return nil, errors.New(`s3: config does not start with "s3"`)
+	}
+
+	cfg := Config{
+		Host:   data[1],
+		Bucket: data[2],
+	}
+
+	return cfg, nil
+}

backend/s3/uri_test.go

@@ -0,0 +1,33 @@
+package s3
+
+import "testing"
+
+var uriTests = []struct {
+	s   string
+	cfg Config
+}{
+	{"s3://eu-central-1/bucketname", Config{
+		Host:   "eu-central-1",
+		Bucket: "bucketname",
+	}},
+	{"s3:hostname:foobar", Config{
+		Host:   "hostname",
+		Bucket: "foobar",
+	}},
+}
+
+func TestParseConfig(t *testing.T) {
+	for i, test := range uriTests {
+		cfg, err := ParseConfig(test.s)
+		if err != nil {
+			t.Errorf("test %d failed: %v", i, err)
+			continue
+		}
+
+		if cfg != test.cfg {
+			t.Errorf("test %d: wrong config, want:\n  %v\ngot:\n  %v",
+				i, test.cfg, cfg)
+			continue
+		}
+	}
+}