Allow password entry for shared directories

webcontroller/opengraph.go

@@ -124,12 +124,20 @@ func (wc *WebController) metadataFromFilesystem(r *http.Request, f api.Filesyste
 		}
 	}
 
+	// The services which make link previews don't keep cookies, so a password
+	// in the link has to be in every URL they open
+	var query, thumbnail = "", "?thumbnail"
+	if password := r.URL.Query().Get("password"); password != "" {
+		password = "password=" + url.QueryEscape(password)
+		query, thumbnail = "?"+password, thumbnail+"&"+password
+	}
+
 	return generateOGData(
 		base.Name,
 		base.FileType,
-		addr+"/d"+filepath,
-		addr+"/api/filesystem"+filepath,
-		addr+"/api/filesystem"+filepath+"?thumbnail",
+		addr+"/d"+filepath+query,
+		addr+"/api/filesystem"+filepath+query,
+		addr+"/api/filesystem"+filepath+thumbnail,
 		colour,
 	)
 }