added firebase and rudimentary leaderboard support

addons/godot-firebase/database/database.gd

@@ -0,0 +1,51 @@
+## @meta-authors TODO
+## @meta-version 2.2
+## The Realtime Database API for Firebase.
+## Documentation TODO.
+@tool
+class_name FirebaseDatabase
+extends Node
+
+var _base_url : String = ""
+
+var _config : Dictionary = {}
+
+var _auth : Dictionary = {}
+
+func _set_config(config_json : Dictionary) -> void:
+	_config = config_json
+	_check_emulating()
+
+func _check_emulating() -> void :
+	## Check emulating
+	if not Firebase.emulating:
+		_base_url = _config.databaseURL
+	else:
+		var port : String = _config.emulators.ports.realtimeDatabase
+		if port == "":
+			Firebase._printerr("You are in 'emulated' mode, but the port for Realtime Database has not been configured.")
+		else:
+			_base_url = "http://localhost"
+
+func _on_FirebaseAuth_login_succeeded(auth_result : Dictionary) -> void:
+	_auth = auth_result
+
+func _on_FirebaseAuth_token_refresh_succeeded(auth_result : Dictionary) -> void:
+	_auth = auth_result
+
+func _on_FirebaseAuth_logout() -> void:
+	_auth = {}
+
+func get_database_reference(path : String, filter : Dictionary = {}) -> FirebaseDatabaseReference:
+	var firebase_reference = load("res://addons/godot-firebase/database/firebase_database_reference.tscn").instantiate()
+	firebase_reference.set_db_path(path, filter)
+	firebase_reference.set_auth_and_config(_auth, _config)
+	add_child(firebase_reference)
+	return firebase_reference
+	
+func get_once_database_reference(path : String, filter : Dictionary = {}) -> FirebaseOnceDatabaseReference:
+	var firebase_reference = load("res://addons/godot-firebase/database/firebase_once_database_reference.tscn").instantiate()
+	firebase_reference.set_db_path(path, filter)
+	firebase_reference.set_auth_and_config(_auth, _config)
+	add_child(firebase_reference)
+	return firebase_reference