OpenGraph: use repo avatar if exist (#12586)

models/repo.go

@@ -2254,6 +2254,11 @@ func (repo *Repository) relAvatarLink(e Engine) string {
 	return setting.AppSubURL + "/repo-avatars/" + repo.Avatar
 }
 
+// AvatarLink returns a link to the repository's avatar.
+func (repo *Repository) AvatarLink() string {
+	return repo.avatarLink(x)
+}
+
 // avatarLink returns user avatar absolute link.
 func (repo *Repository) avatarLink(e Engine) string {
 	link := repo.relAvatarLink(e)

templates/base/head.tmpl

@@ -97,7 +97,11 @@
 		{{end}}
 	{{end}}
 	<meta property="og:type" content="object" />
-	<meta property="og:image" content="{{.Repository.Owner.AvatarLink}}" />
+	{{if .Repository.AvatarLink}}
+		<meta property="og:image" content="{{.Repository.AvatarLink}}" />
+	{{else}}
+		<meta property="og:image" content="{{.Repository.Owner.AvatarLink}}" />
+	{{end}}
 {{else}}
 	<meta property="og:title" content="{{AppName}}">
 	<meta property="og:type" content="website" />