Towards a generalized solution
Towards a generalized solution
Embedded Files
The current saving and loading system will not work consistently as we add new features to the game
The current saving and loading system will not work consistently as we add new features to the game
To generalize further we need to split saving into two parts - marked for saving and saved
To generalize further we need to split saving into two parts - marked for saving and saved
Then split loading into two parts pre-load check and loading
Then split loading into two parts pre-load check and loading
Create Custom Resource for our saved data
Create Custom Resource for our saved data
Create a New Script called saved_data.gd
Create a New Script called saved_data.gd
Set the class_name to SavedData
Set the class_name to SavedData
In the saved data script
In the saved data script
provide a class name
provide a class name
so we can reference it
so we can reference it
extend resource
extend resource
create variables to store
create variables to store
the position and the scene_path
the position and the scene_path
Update the SavedGame Resource script
Update the SavedGame Resource script
to be more generalized
to be more generalized
remove the strawberry positions
remove the strawberry positions
add an array of saved data
add an array of saved data
Every node that wants to save itself
Every node that wants to save itself
needs an on_save_game function
needs an on_save_game function
This is the function implemented in the Strawberry script
This is the function implemented in the Strawberry script
Add each node that needs to be saved
Add each node that needs to be saved
to a new group called save
to a new group called save
SAVING
SAVING
Return to the SaveAndLoad script
Return to the SaveAndLoad script
In the save_game function
In the save_game function
Remove specialized code
Remove specialized code
Create a list of data about the object to save
Create a list of data about the object to save
now call the on_save_game function in all nodes which are in the save group and send the list of data as a parameter
now call the on_save_game function in all nodes which are in the save group and send the list of data as a parameter
Finally push the saved data into the new field in the SavedGame resource
Finally push the saved data into the new field in the SavedGame resource
LOADING
LOADING
Any node which needs to complete operations
Any node which needs to complete operations
BEFORE loading the game must have a
BEFORE loading the game must have a
on_before_load_game() function
on_before_load_game() function
In the Strawberry script
In the Strawberry script
add the on_before_load_game() function
add the on_before_load_game() function
remove the strawberry from its parent
remove the strawberry from its parent
delete the strawberry from the scene
delete the strawberry from the scene
In the SaveAndLoad script
In the SaveAndLoad script
remove specialized code
remove specialized code
replace with a call to the save group
replace with a call to the save group
to clear the scene
to clear the scene
Now restore the saved items
Now restore the saved items
by looping through the array
by looping through the array
and add it to the current scene
and add it to the current scene
finally restore the internal values
finally restore the internal values
of each node by calling the new
of each node by calling the new
on_load_game function
on_load_game function
(We will make this next)
(We will make this next)
Create the on_load_game function
Create the on_load_game function
in all nodes which need to be loaded
in all nodes which need to be loaded
SECURITY ISSUES
SECURITY ISSUES
This save system works well however it exposes some vulnerabilities/ Because the save data is stored in an external and human-readable format cheaters could manipulate values such as health or high score etc.
This save system works well however it exposes some vulnerabilities/ Because the save data is stored in an external and human-readable format cheaters could manipulate values such as health or high score etc.
A more serious issue is that malicious code can be injected into our save files which will run when we load a game.
A more serious issue is that malicious code can be injected into our save files which will run when we load a game.
To prevent this you can install an addon from the asset library to check save files for malicious code before loading it
To prevent this you can install an addon from the asset library to check save files for malicious code before loading it
Go to the asset library and search for the keyword "safe"
Go to the asset library and search for the keyword "safe"
Choose the Godot Safe Resource Loader by dekork
Choose the Godot Safe Resource Loader by dekork
Download it
Download it
Install it
Install it
Add the plugin to the project
Add the plugin to the project
Click on Project --> Project Settings --> Plugins
Click on Project --> Project Settings --> Plugins
Enable it
Enable it
Reload the project
Reload the project
Project --> Reload Current Project
Project --> Reload Current Project
To use the plugin
To use the plugin
go to the SaveAndLoad script
go to the SaveAndLoad script
go to the load_game function
go to the load_game function
the plugin contains a SafeResourceLoader class
the plugin contains a SafeResourceLoader class
use this to load the save file
use this to load the save file
Add a check to print a message if
Add a check to print a message if
malicious code was found
malicious code was found
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