Rewrite entire codebase to split into client and server

src/server/common.rs

@@ -0,0 +1,11 @@
+use crate::core::common::UnixUser;
+
+/// This function creates a regex that matches items (users, databases)
+/// that belong to the user or any of the user's groups.
+pub fn create_user_group_matching_regex(user: &UnixUser) -> String {
+    if user.groups.is_empty() {
+        format!("{}(_.+)?", user.username)
+    } else {
+        format!("({}|{})(_.+)?", user.username, user.groups.join("|"))
+    }
+}