Update ParseNamed to require canonical form

Signed-off-by: Derek McGowan <derek@mcgstyle.net> (github: dmcgowan)

reference/normalize_test.go

@@ -208,6 +208,13 @@ func TestParseRepositoryInfo(t *testing.T) {
 			AmbiguousName: "index.docker.io/library/ubuntu-12.04-base",
 			Domain:        "docker.io",
 		},
+		{
+			RemoteName:    "library/foo",
+			FamiliarName:  "foo",
+			FullName:      "docker.io/library/foo",
+			AmbiguousName: "docker.io/foo",
+			Domain:        "docker.io",
+		},
 		{
 			RemoteName:    "library/foo/bar",
 			FamiliarName:  "library/foo/bar",

reference/reference.go

@@ -55,6 +55,9 @@ var (
 
 	// ErrNameTooLong is returned when a repository name is longer than NameTotalLengthMax.
 	ErrNameTooLong = fmt.Errorf("repository name must not be more than %v characters", NameTotalLengthMax)
+
+	// ErrNameNotCanonical is returned when a name is not canonical.
+	ErrNameNotCanonical = errors.New("repository name must be canonical")
 )
 
 // Reference is an opaque object reference identifier that may include
@@ -231,18 +234,17 @@ func Parse(s string) (Reference, error) {
 }
 
 // ParseNamed parses s and returns a syntactically valid reference implementing
-// the Named interface. The reference must have a name, otherwise an error is
-// returned.
+// the Named interface. The reference must have a name and be in the canonical
+// form, otherwise an error is returned.
 // If an error was encountered it is returned, along with a nil Reference.
 // NOTE: ParseNamed will not handle short digests.
 func ParseNamed(s string) (Named, error) {
-	ref, err := Parse(s)
+	named, err := ParseNormalizedNamed(s)
 	if err != nil {
 		return nil, err
 	}
-	named, isNamed := ref.(Named)
-	if !isNamed {
-		return nil, fmt.Errorf("reference %s has no name", ref.String())
+	if named.String() != s {
+		return nil, ErrNameNotCanonical
 	}
 	return named, nil
 }

reference/reference_test.go

@@ -583,3 +583,77 @@ func TestWithDigest(t *testing.T) {
 		}
 	}
 }
+
+func TestParseNamed(t *testing.T) {
+	testcases := []struct {
+		input  string
+		domain string
+		name   string
+		err    error
+	}{
+		{
+			input:  "test.com/foo",
+			domain: "test.com",
+			name:   "foo",
+		},
+		{
+			input:  "test:8080/foo",
+			domain: "test:8080",
+			name:   "foo",
+		},
+		{
+			input: "test_com/foo",
+			err:   ErrNameNotCanonical,
+		},
+		{
+			input: "test.com",
+			err:   ErrNameNotCanonical,
+		},
+		{
+			input: "foo",
+			err:   ErrNameNotCanonical,
+		},
+		{
+			input: "library/foo",
+			err:   ErrNameNotCanonical,
+		},
+		{
+			input:  "docker.io/library/foo",
+			domain: "docker.io",
+			name:   "library/foo",
+		},
+		// Ambiguous case, parser will add "library/" to foo
+		{
+			input: "docker.io/foo",
+			err:   ErrNameNotCanonical,
+		},
+	}
+	for _, testcase := range testcases {
+		failf := func(format string, v ...interface{}) {
+			t.Logf(strconv.Quote(testcase.input)+": "+format, v...)
+			t.Fail()
+		}
+
+		named, err := ParseNamed(testcase.input)
+		if err != nil && testcase.err == nil {
+			failf("error parsing name: %s", err)
+			continue
+		} else if err == nil && testcase.err != nil {
+			failf("parsing succeded: expected error %v", testcase.err)
+			continue
+		} else if err != testcase.err {
+			failf("unexpected error %v, expected %v", err, testcase.err)
+			continue
+		} else if err != nil {
+			continue
+		}
+
+		domain, name := SplitHostname(named)
+		if domain != testcase.domain {
+			failf("unexpected domain: got %q, expected %q", domain, testcase.domain)
+		}
+		if name != testcase.name {
+			failf("unexpected name: got %q, expected %q", name, testcase.name)
+		}
+	}
+}