Fix username rendering bug (#2122)

* Fix username rendering bug

* XSS integration test

* Migration to unescape user full names

models/migrations/migrations.go

@@ -122,6 +122,8 @@ var migrations = []Migration{
 	NewMigration("adds comment to an action", addCommentIDToAction),
 	// v36 -> v37
 	NewMigration("regenerate git hooks", regenerateGitHooks36),
+	// v37 -> v38
+	NewMigration("unescape user full names", unescapeUserFullNames),
 }
 
 // Migrate database to current version

models/migrations/v37.go

@@ -0,0 +1,32 @@
+// 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 migrations
+
+import (
+	"html"
+
+	"code.gitea.io/gitea/models"
+
+	"github.com/go-xorm/xorm"
+)
+
+func unescapeUserFullNames(x *xorm.Engine) (err error) {
+	const batchSize = 100
+	for start := 0; ; start += batchSize {
+		users := make([]*models.User, 0, batchSize)
+		if err := x.Limit(start, batchSize).Find(users); err != nil {
+			return err
+		}
+		if len(users) == 0 {
+			return nil
+		}
+		for _, user := range users {
+			user.FullName = html.UnescapeString(user.FullName)
+			if _, err := x.Cols("full_name").Update(user); err != nil {
+				return err
+			}
+		}
+	}
+}

models/user.go

@@ -35,7 +35,6 @@ import (
 	"code.gitea.io/gitea/modules/avatar"
 	"code.gitea.io/gitea/modules/base"
 	"code.gitea.io/gitea/modules/log"
-	"code.gitea.io/gitea/modules/markdown"
 	"code.gitea.io/gitea/modules/setting"
 )
 
@@ -164,8 +163,6 @@ func (u *User) UpdateDiffViewStyle(style string) error {
 // AfterSet is invoked from XORM after setting the value of a field of this object.
 func (u *User) AfterSet(colName string, _ xorm.Cell) {
 	switch colName {
-	case "full_name":
-		u.FullName = markdown.Sanitize(u.FullName)
 	case "created_unix":
 		u.Created = time.Unix(u.CreatedUnix, 0).Local()
 	case "updated_unix":
@@ -871,7 +868,6 @@ func updateUser(e Engine, u *User) error {
 	u.Website = base.TruncateString(u.Website, 255)
 	u.Description = base.TruncateString(u.Description, 255)
 
-	u.FullName = markdown.Sanitize(u.FullName)
 	_, err := e.Id(u.ID).AllCols().Update(u)
 	return err
 }