Better URL validation (#1507)

* Add correct git branch name validation

* Change git refname validation error constant name

* Implement URL validation based on GoLang url.Parse method

* Backward compatibility with older Go compiler

* Add git reference name validation unit tests

* Remove unused variable in unit test

* Implement URL validation based on GoLang url.Parse method

* Backward compatibility with older Go compiler

* Add url validation unit tests

modules/validation/validurl_test.go

@@ -0,0 +1,111 @@
+// Copyright 2017 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 validation
+
+import (
+	"testing"
+
+	"github.com/go-macaron/binding"
+)
+
+var urlValidationTestCases = []validationTestCase{
+	{
+		description: "Empty URL",
+		data: TestForm{
+			URL: "",
+		},
+		expectedErrors: binding.Errors{},
+	},
+	{
+		description: "URL without port",
+		data: TestForm{
+			URL: "http://test.lan/",
+		},
+		expectedErrors: binding.Errors{},
+	},
+	{
+		description: "URL with port",
+		data: TestForm{
+			URL: "http://test.lan:3000/",
+		},
+		expectedErrors: binding.Errors{},
+	},
+	{
+		description: "URL with IPv6 address without port",
+		data: TestForm{
+			URL: "http://[::1]/",
+		},
+		expectedErrors: binding.Errors{},
+	},
+	{
+		description: "URL with IPv6 address with port",
+		data: TestForm{
+			URL: "http://[::1]:3000/",
+		},
+		expectedErrors: binding.Errors{},
+	},
+	{
+		description: "Invalid URL",
+		data: TestForm{
+			URL: "http//test.lan/",
+		},
+		expectedErrors: binding.Errors{
+			binding.Error{
+				FieldNames:     []string{"URL"},
+				Classification: binding.ERR_URL,
+				Message:        "Url",
+			},
+		},
+	},
+	{
+		description: "Invalid schema",
+		data: TestForm{
+			URL: "ftp://test.lan/",
+		},
+		expectedErrors: binding.Errors{
+			binding.Error{
+				FieldNames:     []string{"URL"},
+				Classification: binding.ERR_URL,
+				Message:        "Url",
+			},
+		},
+	},
+	{
+		description: "Invalid port",
+		data: TestForm{
+			URL: "http://test.lan:3x4/",
+		},
+		expectedErrors: binding.Errors{
+			binding.Error{
+				FieldNames:     []string{"URL"},
+				Classification: binding.ERR_URL,
+				Message:        "Url",
+			},
+		},
+	},
+	{
+		description: "Invalid port with IPv6 address",
+		data: TestForm{
+			URL: "http://[::1]:3x4/",
+		},
+		expectedErrors: binding.Errors{
+			binding.Error{
+				FieldNames:     []string{"URL"},
+				Classification: binding.ERR_URL,
+				Message:        "Url",
+			},
+		},
+	},
+}
+
+func Test_ValidURLValidation(t *testing.T) {
+	AddBindingRules()
+
+	for _, testCase := range urlValidationTestCases {
+		t.Run(testCase.description, func(t *testing.T) {
+			performValidationTest(t, testCase)
+		})
+	}
+}