Send size to /avatars if requested (#15459) (#15528)

Backport #15459

If an avatar is requested in a particular size ensure that /avatars also gets the size request

Fix #15453

Signed-off-by: Andrew Thornton <art27@cantab.net>

Co-authored-by: 6543 <6543@obermui.de>

models/avatar.go

@@ -81,7 +81,7 @@ func LibravatarURL(email string) (*url.URL, error) {
 }
 
 // HashedAvatarLink returns an avatar link for a provided email
-func HashedAvatarLink(email string) string {
+func HashedAvatarLink(email string, size int) string {
 	lowerEmail := strings.ToLower(strings.TrimSpace(email))
 	sum := fmt.Sprintf("%x", md5.Sum([]byte(lowerEmail)))
 	_, _ = cache.GetString("Avatar:"+sum, func() (string, error) {
@@ -108,6 +108,9 @@ func HashedAvatarLink(email string) string {
 		}
 		return lowerEmail, nil
 	})
+	if size > 0 {
+		return setting.AppSubURL + "/avatar/" + url.PathEscape(sum) + "?size=" + strconv.Itoa(size)
+	}
 	return setting.AppSubURL + "/avatar/" + url.PathEscape(sum)
 }
 
@@ -129,7 +132,7 @@ func SizedAvatarLink(email string, size int) string {
 		// This is the slow path that would need to call LibravatarURL() which
 		// does DNS lookups. Avoid it by issuing a redirect so we don't block
 		// the template render with network requests.
-		return HashedAvatarLink(email)
+		return HashedAvatarLink(email, size)
 	} else if !setting.DisableGravatar {
 		// copy GravatarSourceURL, because we will modify its Path.
 		copyOfGravatarSourceURL := *setting.GravatarSourceURL

models/user_avatar.go

@@ -82,6 +82,9 @@ func (u *User) RealSizedAvatarLink(size int) string {
 		if u.Avatar == "" {
 			return DefaultAvatarLink()
 		}
+		if size > 0 {
+			return setting.AppSubURL + "/avatars/" + u.Avatar + "?size=" + strconv.Itoa(size)
+		}
 		return setting.AppSubURL + "/avatars/" + u.Avatar
 	case setting.DisableGravatar, setting.OfflineMode:
 		if u.Avatar == "" {
@@ -89,7 +92,9 @@ func (u *User) RealSizedAvatarLink(size int) string {
 				log.Error("GenerateRandomAvatar: %v", err)
 			}
 		}
-
+		if size > 0 {
+			return setting.AppSubURL + "/avatars/" + u.Avatar + "?size=" + strconv.Itoa(size)
+		}
 		return setting.AppSubURL + "/avatars/" + u.Avatar
 	}
 	return SizedAvatarLink(u.AvatarEmail, size)