From d6d643fe86f125ee7fdda82264602b7e8db2a36b Mon Sep 17 00:00:00 2001
From: wxiaoguang <wxiaoguang@gmail.com>
Date: Thu, 3 Jul 2025 11:02:38 +0800
Subject: Fix http auth header parsing (#34936)

Using `strings.EqualFold` is wrong in many cases.
---
 modules/auth/httpauth/httpauth.go | 47 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 modules/auth/httpauth/httpauth.go

(limited to 'modules/auth/httpauth/httpauth.go')

diff --git a/modules/auth/httpauth/httpauth.go b/modules/auth/httpauth/httpauth.go
new file mode 100644
index 0000000000..7f1f1ee152
--- /dev/null
+++ b/modules/auth/httpauth/httpauth.go
@@ -0,0 +1,47 @@
+// Copyright 2025 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package httpauth
+
+import (
+	"encoding/base64"
+	"strings"
+
+	"code.gitea.io/gitea/modules/util"
+)
+
+type BasicAuth struct {
+	Username, Password string
+}
+
+type BearerToken struct {
+	Token string
+}
+
+type ParsedAuthorizationHeader struct {
+	BasicAuth   *BasicAuth
+	BearerToken *BearerToken
+}
+
+func ParseAuthorizationHeader(header string) (ret ParsedAuthorizationHeader, _ bool) {
+	parts := strings.Fields(header)
+	if len(parts) != 2 {
+		return ret, false
+	}
+	if util.AsciiEqualFold(parts[0], "basic") {
+		s, err := base64.StdEncoding.DecodeString(parts[1])
+		if err != nil {
+			return ret, false
+		}
+		u, p, ok := strings.Cut(string(s), ":")
+		if !ok {
+			return ret, false
+		}
+		ret.BasicAuth = &BasicAuth{Username: u, Password: p}
+		return ret, true
+	} else if util.AsciiEqualFold(parts[0], "token") || util.AsciiEqualFold(parts[0], "bearer") {
+		ret.BearerToken = &BearerToken{Token: parts[1]}
+		return ret, true
+	}
+	return ret, false
+}
-- 
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