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/binding_test.go

@@ -0,0 +1,62 @@
+// 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 (
+	"fmt"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/go-macaron/binding"
+	"github.com/stretchr/testify/assert"
+	"gopkg.in/macaron.v1"
+)
+
+const (
+	testRoute = "/test"
+)
+
+type (
+	validationTestCase struct {
+		description    string
+		data           interface{}
+		expectedErrors binding.Errors
+	}
+
+	handlerFunc func(interface{}, ...interface{}) macaron.Handler
+
+	modeler interface {
+		Model() string
+	}
+
+	TestForm struct {
+		BranchName string `form:"BranchName" binding:"GitRefName"`
+		URL        string `form:"ValidUrl" binding:"ValidUrl"`
+	}
+)
+
+func performValidationTest(t *testing.T, testCase validationTestCase) {
+	httpRecorder := httptest.NewRecorder()
+	m := macaron.Classic()
+
+	m.Post(testRoute, binding.Validate(testCase.data), func(actual binding.Errors) {
+		assert.Equal(t, fmt.Sprintf("%+v", testCase.expectedErrors), fmt.Sprintf("%+v", actual))
+	})
+
+	req, err := http.NewRequest("POST", testRoute, nil)
+	if err != nil {
+		panic(err)
+	}
+
+	m.ServeHTTP(httpRecorder, req)
+
+	switch httpRecorder.Code {
+	case http.StatusNotFound:
+		panic("Routing is messed up in test fixture (got 404): check methods and paths")
+	case http.StatusInternalServerError:
+		panic("Something bad happened on '" + testCase.description + "'")
+	}
+}