New extension: File Upload Download

[github-actions]

Description

This is a GDevelop extension provides file upload/download capabilities and texture pack management for games.

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Core Features:

1. Text Files

   • Upload text files to variables
   • Download text content as file

2. ZIP Files

   • Upload ZIP files and decompress into variable structures (base64 or text)
   • Download ZIP files
   • Apply texture packs from ZIP files using an index.json manifest

3. Images

   • Download game resources as PNG files
   • Upload images to replace existing resources
   • Both support resource picker and string expression inputs

4. Texture Packs

   • Load texture packs from ZIP archives
   • Uses index.json to map resource names to file paths
   • Expected structure:

     JSON
     {
        "pack-data": {
           "name": "Texture pack",
           "pack-version": "1.0.0",
           "game-version": "1.0.0"
        }, // pack-data is optional.
        "textures": {
           "<Resource-name>": "<new/file/directory/relative/to/index>"
        }
     }
     

     Texture packs only support images, not audios yet.

Implementation Details:

• Uses JSZip library (bundled in initialization code)
• Async operations for file handling
• Creates temporary file input elements for uploads
• Converts images to/from base64 for storage and manipulation
• PIXI.js texture management for resource replacement
• Searches up to specified depth for index.json in ZIP structures

Use Cases:

• Save/load game data
• User-generated content
• Modding support through texture packs
• Export/import configurations
• Custom skins/themes

The extension enables web-based games to interact with the user's file system in a browser-safe manner.

How to use the extension

add an action like Upload a zipfile Upload image to resource Upload a text file to variable
it pretty much does what it sounds like it will do

Checklist

• I've followed all of the best practices.
• I confirm that this extension can be integrated to this GitHub repository, distributed and MIT licensed.
• I am aware that the extension may be updated by anyone, and do not need my explicit consent to do so.

Example file

My project119.zip

Extension file

Files(2).zip

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Extension by @moolbie

You can update the extension on this "Pull Request" by commenting the update command: in the comment field, type !update, then drag and drop a zip file with your extension file in the commenting field, like how you initially submitted the extension. It should look like this:

!update [MyExtension.zip](https://github.com/GDevelopApp/GDevelop-extensions/files/12709661/MyExtension.zip)

It can take a few seconds for the file to fully upload and show as the above. Once it is like shown above, click "Comment" and let the bot do the rest!

[moolbie]

@4ian