Fix username rendering bug (#2122)

* Fix username rendering bug

* XSS integration test

* Migration to unescape user full names

integrations/xss_test.go

@@ -0,0 +1,37 @@
+// 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 integrations
+
+import (
+	"net/http"
+	"testing"
+
+	"code.gitea.io/gitea/models"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestXSSUserFullName(t *testing.T) {
+	prepareTestEnv(t)
+	user := models.AssertExistsAndLoadBean(t, &models.User{ID: 2}).(*models.User)
+	const fullName = `name & <script class="evil">alert('Oh no!');</script>`
+
+	session := loginUser(t, user.Name)
+	req := NewRequestWithValues(t, "POST", "/user/settings", map[string]string{
+		"_csrf":     GetCSRF(t, session, "/user/settings"),
+		"name":      user.Name,
+		"full_name": fullName,
+		"email":     user.Email,
+	})
+	session.MakeRequest(t, req, http.StatusFound)
+
+	req = NewRequestf(t, "GET", "/%s", user.Name)
+	resp := session.MakeRequest(t, req, http.StatusOK)
+	htmlDoc := NewHTMLParser(t, resp.Body)
+	assert.EqualValues(t, 0, htmlDoc.doc.Find("script.evil").Length())
+	assert.EqualValues(t, fullName,
+		htmlDoc.doc.Find("div.content").Find(".header.text.center").Text(),
+	)
+}