Support Proxy protocol (#12527)

This PR adds functionality to allow Gitea to sit behind an
HAProxy and HAProxy protocolled connections directly.

Fix #7508

Signed-off-by: Andrew Thornton <art27@cantab.net>

1 files changed, 15 insertions, 0 deletions

diff --git a/modules/proxyprotocol/util.go b/modules/proxyprotocol/util.go
new file mode 100644
index 0000000000..b12771b686
--- /dev/null
+++ b/modules/proxyprotocol/util.go
@@ -0,0 +1,15 @@
+// Copyright 2020 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package proxyprotocol
+
+import "io"
+
+var localHeader = append(v2Prefix, '\x20', '\x00', '\x00', '\x00', '\x00')
+
+// WriteLocalHeader will write the ProxyProtocol Header for a local connection to the provided writer
+func WriteLocalHeader(w io.Writer) error {
+	_, err := w.Write(localHeader)
+	return err
+}