working commit

pkg/auxhttp/basic.go

@@ -0,0 +1,51 @@
+/*
+ * Copyright 2026 Oleg Borodin <onborodin@gmail.com>
+ *
+ * This work is published and licensed under a Creative Commons
+ * Attribution-NonCommercial-NoDerivatives 4.0 International License.
+ *
+ * Distribution of this work is permitted, but commercial use and
+ * modifications are strictly prohibited.
+ */
+
+package auxhttp
+
+import (
+	"encoding/base64"
+	"fmt"
+	"strings"
+)
+
+func ParseBasicAuth(basicFields string) (string, string, error) {
+	var err error
+	var username string
+	var password string
+	if basicFields == "" {
+		err := fmt.Errorf("Empty auth field")
+		return username, password, err
+	}
+	authFields := strings.SplitN(basicFields, " ", 2)
+	if len(authFields) < 2 {
+		err = fmt.Errorf("Cannot split auth field: %s", basicFields)
+		return username, password, err
+	}
+	authType := strings.TrimSpace(authFields[0])
+	if strings.ToLower(authType) != strings.ToLower("Basic") {
+		err = fmt.Errorf("Not basic auth type")
+		return username, password, err
+	}
+	authPairEncoded := authFields[1]
+	pairEncoded, err := base64.StdEncoding.DecodeString(authPairEncoded)
+	if err != nil {
+		err = fmt.Errorf("Cannon decode auth pair")
+		return username, password, err
+	}
+	authPair := strings.SplitN(string(pairEncoded), ":", 2)
+	if len(authPair) != 2 {
+		err = fmt.Errorf("Wrong auth pair")
+		return username, password, err
+	}
+	username = authPair[0]
+	password = authPair[1]
+	return username, password, err
+}