Always return local url for users avatar

Avoids having to wait for DNS lookups when libravatar is activated
fixing #6046

Author: strk

models/action_test.go

@@ -173,7 +173,7 @@ func TestPushCommits_AvatarLink(t *testing.T) {
 	pushCommits.Len = len(pushCommits.Commits)
 
 	assert.Equal(t,
-		"https://secure.gravatar.com/avatar/ab53a2911ddf9b4817ac01ddcd3d975f?d=identicon",
+		"/user/avatar/user2/-1",
 		pushCommits.AvatarLink("[email protected]"))
 
 	assert.Equal(t,

models/user.go

@@ -17,6 +17,7 @@ import (
 	"image/png"
 	"os"
 	"path/filepath"
+	"strconv"
 	"strings"
 	"time"
 	"unicode/utf8"
@@ -373,9 +374,20 @@ func (u *User) generateRandomAvatar(e Engine) error {
 	return nil
 }
 
-// SizedRelAvatarLink returns a relative link to the user's avatar. When
-// applicable, the link is for an avatar of the indicated size (in pixels).
+// SizedRelAvatarLink returns a link to the user's avatar via
+// the local explore page. Function returns immediately.
+// When applicable, the link is for an avatar of the indicated size (in pixels).
 func (u *User) SizedRelAvatarLink(size int) string {
+	return setting.AppSubURL + "/user/avatar/" + u.Name + "/" + strconv.Itoa(size)
+}
+
+// RealSizedAvatarLink returns a link to the user's avatar. When
+// applicable, the link is for an avatar of the indicated size (in pixels).
+//
+// This function make take time to return when federated avatars
+// are in use, due to a DNS lookup need
+//
+func (u *User) RealSizedAvatarLink(size int) string {
 	if u.ID == -1 {
 		return base.DefaultAvatarLink()
 	}

routers/routes/routes.go

@@ -278,6 +278,7 @@ func RegisterRoutes(m *macaron.Macaron) {
 
 	// ***** START: User *****
 	m.Group("/user", func() {
+		m.Get("/avatar/:username/:size", user.Avatar)
 		m.Get("/login", user.SignIn)
 		m.Post("/login", bindIgnErr(auth.SignInForm{}), user.SignInPost)
 		m.Group("", func() {

routers/user/avatar.go

@@ -0,0 +1,37 @@
+// Copyright 2019 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 user
+
+import (
+	"strconv"
+
+	"code.gitea.io/gitea/models"
+	"code.gitea.io/gitea/modules/context"
+	"code.gitea.io/gitea/modules/log"
+)
+
+// Avatar redirect browser to user avatar of requested size
+func Avatar(ctx *context.Context) {
+	userName := ctx.Params(":username")
+	size, err := strconv.Atoi(ctx.Params(":size"))
+	if err != nil {
+		ctx.ServerError("Invalid avatar size", err)
+		return
+	}
+
+	log.Debug("Asked avatar for user %v and size %v", userName, size)
+
+	user, err := models.GetUserByName(userName)
+	if err != nil {
+		if models.IsErrUserNotExist(err) {
+			ctx.ServerError("Requested avatar for invalid user", err)
+		} else {
+			ctx.ServerError("Retrieving user by name", err)
+		}
+		return
+	}
+
+	ctx.Redirect(user.RealSizedAvatarLink(size))
+}