From 08796346a0771e3c13247e22a9bc94e11f129e4e Mon Sep 17 00:00:00 2001
From: Bruno Lorenz <b.lorenz@afterspring.org>
Date: Sat, 5 Aug 2017 09:01:57 +0200
Subject: [PATCH] Append new validations

- hostname
- fqdn
---
 baked_in.go       | 17 +++++++++
 doc.go            | 12 ++++++
 regexes.go        |  2 +
 validator_test.go | 93 +++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 124 insertions(+)

diff --git a/baked_in.go b/baked_in.go
index 1241f35..cbefb30 100644
--- a/baked_in.go
+++ b/baked_in.go
@@ -125,6 +125,8 @@ var (
 		"ip_addr":         isIPAddrResolvable,
 		"unix_addr":       isUnixAddrResolvable,
 		"mac":             isMAC,
+		"hostname":        isHostname,
+		"fqdn":            isFQDN,
 	}
 )
 
@@ -1477,3 +1479,18 @@ func isIP6Addr(fl FieldLevel) bool {
 
 	return ip != nil && ip.To4() == nil
 }
+
+func isHostname(fl FieldLevel) bool {
+	return hostnameRegex.MatchString(fl.Field().String())
+}
+
+func isFQDN(fl FieldLevel) bool {
+	val := fl.Field().String()
+
+	if val[len(val)-1] == '.' && val[len(val)-2] != '.' {
+		val = strings.TrimRight(val, ".")
+	}
+
+	return hostnameRegex.MatchString(val) &&
+		(strings.IndexAny(val, ".") > -1)
+}
diff --git a/doc.go b/doc.go
index 7da5e59..77e35fe 100644
--- a/doc.go
+++ b/doc.go
@@ -794,6 +794,18 @@ Note: See Go's ParseMAC for accepted formats and types:
 
 	http://golang.org/src/net/mac.go?s=866:918#L29
 
+Hostname
+
+This validates that a stringa value is a valid Hostname
+
+	Usage: hostname
+
+Full Qualified Domain Name (FQDN)
+
+This validates that a string value contains a valid FQDN.
+
+	Usage: fqdn
+
 Alias Validators and Tags
 
 NOTE: When returning an error, the tag returned in "FieldError" will be
diff --git a/regexes.go b/regexes.go
index c2d9830..d8d8a22 100644
--- a/regexes.go
+++ b/regexes.go
@@ -30,6 +30,7 @@ const (
 	latitudeRegexString            = "^[-+]?([1-8]?\\d(\\.\\d+)?|90(\\.0+)?)$"
 	longitudeRegexString           = "^[-+]?(180(\\.0+)?|((1[0-7]\\d)|([1-9]?\\d))(\\.\\d+)?)$"
 	sSNRegexString                 = `^\d{3}[- ]?\d{2}[- ]?\d{4}$`
+	hostnameRegexString            = `^(([a-zA-Z]|[a-zA-Z][a-zA-Z0-9\-]*[a-zA-Z0-9])\.)*([A-Za-z]|[A-Za-z][A-Za-z0-9\-]*[A-Za-z0-9])$`
 )
 
 var (
@@ -60,4 +61,5 @@ var (
 	latitudeRegex            = regexp.MustCompile(latitudeRegexString)
 	longitudeRegex           = regexp.MustCompile(longitudeRegexString)
 	sSNRegex                 = regexp.MustCompile(sSNRegexString)
+	hostnameRegex            = regexp.MustCompile(hostnameRegexString)
 )
diff --git a/validator_test.go b/validator_test.go
index 565e23d..444fb07 100644
--- a/validator_test.go
+++ b/validator_test.go
@@ -7119,3 +7119,96 @@ func TestValidateStructRegisterCtx(t *testing.T) {
 	Equal(t, ctxVal, "testval")
 	Equal(t, ctxSlVal, "slVal")
 }
+
+func TestHostnameValidation(t *testing.T) {
+	tests := []struct {
+		param    string
+		expected bool
+	}{
+		{"test.example.com", true},
+		{"example.com", true},
+		{"example24.com", true},
+		{"test.example24.com", true},
+		{"test24.example24.com", true},
+		{"example", true},
+		{"test.example.com.", false},
+		{"example.com.", false},
+		{"example24.com.", false},
+		{"test.example24.com.", false},
+		{"test24.example24.com.", false},
+		{"example.", false},
+		{"192.168.0.1", false},
+		{"email@example.com", false},
+		{"2001:cdba:0000:0000:0000:0000:3257:9652", false},
+		{"2001:cdba:0:0:0:0:3257:9652", false},
+		{"2001:cdba::3257:9652", false},
+	}
+
+	validate := New()
+
+	for i, test := range tests {
+
+		errs := validate.Var(test.param, "hostname")
+
+		if test.expected {
+			if !IsEqual(errs, nil) {
+				t.Fatalf("Index: %d hostname failed Error: %s", i, errs)
+			}
+		} else {
+			if IsEqual(errs, nil) {
+				t.Fatalf("Index: %d hostname failed Error: %s", i, errs)
+			} else {
+				val := getError(errs, "", "")
+				if val.Tag() != "hostname" {
+					t.Fatalf("Index: %d hostname failed Error: %s", i, errs)
+				}
+			}
+		}
+	}
+}
+
+func TestFQDNValidation(t *testing.T) {
+	tests := []struct {
+		param    string
+		expected bool
+	}{
+		{"test.example.com", true},
+		{"example.com", true},
+		{"example24.com", true},
+		{"test.example24.com", true},
+		{"test24.example24.com", true},
+		{"test.example.com.", true},
+		{"example.com.", true},
+		{"example24.com.", true},
+		{"test.example24.com.", true},
+		{"test24.example24.com.", true},
+		{"example", false},
+		{"192.168.0.1", false},
+		{"email@example.com", false},
+		{"2001:cdba:0000:0000:0000:0000:3257:9652", false},
+		{"2001:cdba:0:0:0:0:3257:9652", false},
+		{"2001:cdba::3257:9652", false},
+	}
+
+	validate := New()
+
+	for i, test := range tests {
+
+		errs := validate.Var(test.param, "fqdn")
+
+		if test.expected {
+			if !IsEqual(errs, nil) {
+				t.Fatalf("Index: %d fqdn failed Error: %s", i, errs)
+			}
+		} else {
+			if IsEqual(errs, nil) {
+				t.Fatalf("Index: %d fqdn failed Error: %s", i, errs)
+			} else {
+				val := getError(errs, "", "")
+				if val.Tag() != "fqdn" {
+					t.Fatalf("Index: %d fqdn failed Error: %s", i, errs)
+				}
+			}
+		}
+	}
+}