From 03e3c34308641bd935fe75897843de27239b7f50 Mon Sep 17 00:00:00 2001
From: Manuel de Brito Fontes <aledbf@gmail.com>
Date: Mon, 6 Feb 2017 17:48:08 -0300
Subject: [PATCH] Change server initialization code to use certificates common
 names

---
 core/pkg/ingress/controller/util.go | 48 +++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)

diff --git a/core/pkg/ingress/controller/util.go b/core/pkg/ingress/controller/util.go
index 7ff154d8f..6637d8142 100644
--- a/core/pkg/ingress/controller/util.go
+++ b/core/pkg/ingress/controller/util.go
@@ -114,3 +114,51 @@ func mergeLocationAnnotations(loc *ingress.Location, anns map[string]interface{}
 		glog.Errorf("unexpected error merging extracted annotations in location type: %v", err)
 	}
 }
+
+func isDomainName(s string) bool {
+	// See RFC 1035, RFC 3696.
+	if len(s) == 0 {
+		return false
+	}
+	if len(s) > 255 {
+		return false
+	}
+	if s[len(s)-1] != '.' { // simplify checking loop: make name end in dot
+		s += "."
+	}
+
+	last := byte('.')
+	ok := false // ok once we've seen a letter
+	partlen := 0
+	for i := 0; i < len(s); i++ {
+		c := s[i]
+		switch {
+		default:
+			return false
+		case 'a' <= c && c <= 'z' || 'A' <= c && c <= 'Z' || c == '_':
+			ok = true
+			partlen++
+		case '0' <= c && c <= '9':
+			// fine
+			partlen++
+		case c == '-':
+			// byte before dash cannot be dot
+			if last == '.' {
+				return false
+			}
+			partlen++
+		case c == '.':
+			// byte before dot cannot be dot, dash
+			if last == '.' || last == '-' {
+				return false
+			}
+			if partlen > 63 || partlen == 0 {
+				return false
+			}
+			partlen = 0
+		}
+		last = c
+	}
+
+	return ok
+}