changed strings.HasPrefix(strings.ToLower(name) to use strings.EqualF…

…old instead

shortuuid.go

@@ -33,9 +33,9 @@ func NewWithNamespace(name string) string {
 	switch {
 	case name == "":
 		u = uuid.New()
-	case strings.HasPrefix(strings.ToLower(name), "http://"):
+	case hasPrefixCaseInsensitive(name, "https://"):
 		u = uuid.NewSHA1(uuid.NameSpaceURL, []byte(name))
-	case strings.HasPrefix(strings.ToLower(name), "https://"):
+	case hasPrefixCaseInsensitive(name, "http://"):
 		u = uuid.NewSHA1(uuid.NameSpaceURL, []byte(name))
 	default:
 		u = uuid.NewSHA1(uuid.NameSpaceDNS, []byte(name))
@@ -50,3 +50,7 @@ func NewWithAlphabet(abc string) string {
 	enc := encoder{newAlphabet(abc)}
 	return enc.Encode(uuid.New())
 }
+
+func hasPrefixCaseInsensitive(s, prefix string) bool {
+	return len(s) >= len(prefix) && strings.EqualFold(s[:len(prefix)], prefix)
+}

shortuuid_test.go

@@ -333,3 +333,21 @@ func BenchmarkNewWithAlphabetB16_MB(b *testing.B) {
 		_ = NewWithAlphabet("うえおなにぬねのウエオナニヌネノ")
 	}
 }
+
+func BenchmarkNewWithNamespace(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		_ = NewWithNamespace("someaveragelengthurl")
+	}
+}
+
+func BenchmarkNewWithNamespaceHttp(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		_ = NewWithNamespace("http://someaveragelengthurl.test")
+	}
+}
+
+func BenchmarkNewWithNamespaceHttps(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		_ = NewWithNamespace("https://someaveragelengthurl.test")
+	}
+}