update_index.py

import json
import subprocess
import os
from pprint import pprint

os.makedirs('addons', exist_ok=True)

addons = json.load(open('addons.json', 'r'))['addons']
for addon in addons:
    api = 'https://api.github.com/repos'
    owner = addon['repository']['owner']
    name = addon['repository']['name']
    release = addon['release']
    s = subprocess.check_output(['curl', f'{api}/{owner}/{name}/releases/{release}']).decode('utf-8')
    api_response = json.loads(s)
    for asset in api_response['assets']:
        browser_download_url = asset['browser_download_url']
        subprocess.run(['curl', browser_download_url, '-L', '-O'])

# Generate the index.json file based on the archives we just downloaded.
subprocess.run(['blender', '--command', 'extension', 'server-generate', '--repo-dir=.'])

# Update the archive URL to point to the GitHub release.
with open('index.json', 'r') as fp:
    data = json.load(fp)
    for datum in data['data']:
        archive_url = f'{datum['website']}/releases/download/{datum['version']}/{datum['archive_url']}'
        datum['archive_url'] = archive_url

# Write the new index.json file.
with open('index.json', 'w') as fp:
    json.dump(data, fp, indent=4)