v0.3.1 minor refactor, tests changed to standard library

http.go

@@ -7,34 +7,30 @@ import (
 
 // ParseBasicAuth extracts username/password from Basic auth header
 func ParseBasicAuth(header string) (username, password string, err error) {
-	const prefix = "Basic "
-	if !strings.HasPrefix(header, prefix) {
+	encoded, ok := strings.CutPrefix(header, "Basic ")
+	if !ok {
 		return "", "", ErrAuthInvalidBasicFormat
 	}
 
-	encoded := strings.TrimPrefix(header, prefix)
 	decoded, err := base64.StdEncoding.DecodeString(encoded)
 	if err != nil {
 		return "", "", ErrAuthInvalidBasicEncoding
 	}
 
-	credentials := string(decoded)
-	idx := strings.IndexByte(credentials, ':')
-	if idx < 0 {
+	username, password, ok = strings.Cut(string(decoded), ":")
+	if !ok {
 		return "", "", ErrAuthInvalidBasicCreds
 	}
 
-	return credentials[:idx], credentials[idx+1:], nil
+	return username, password, nil
 }
 
 // ParseBearerToken extracts token from Bearer auth header
 func ParseBearerToken(header string) (token string, err error) {
-	const prefix = "Bearer "
-	if !strings.HasPrefix(header, prefix) {
+	token, ok := strings.CutPrefix(header, "Bearer ")
+	if !ok {
 		return "", ErrAuthInvalidBearerFormat
 	}
-
-	token = strings.TrimPrefix(header, prefix)
 	if token == "" {
 		return "", ErrAuthEmptyBearerToken
 	}
@@ -44,18 +40,8 @@ func ParseBearerToken(header string) (token string, err error) {
 
 // ExtractAuthType returns authentication type from header
 func ExtractAuthType(header string) string {
-	if strings.HasPrefix(header, "Basic ") {
-		return "Basic"
+	if authType, _, ok := strings.Cut(header, " "); ok {
+		return authType
 	}
-	if strings.HasPrefix(header, "Bearer ") {
-		return "Bearer"
-	}
-
-	// Extract first word as auth type
-	idx := strings.IndexByte(header, ' ')
-	if idx > 0 {
-		return header[:idx]
-	}
-	return ""
+	return "" // Matches original behavior if no space is found or string is empty
 }
-