.htaccess

RewriteEngine On

RewriteRule ^updates\.json$ updates.php [L]

updates.php

<?php

declare(strict_types=1);

// https://extensionworkshop.com/documentation/manage/updating-your-extension/

// cat /proc/sys/kernel/random/uuid
final readonly class Uuid
{
  private function __construct(public string $value) {}

  public static function fromString(string $value): ?self
  {
    $pattern = '/^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/i';

    return preg_match($pattern, $value) ? new self($value) : null;
  }

  public function withBraces(): string
  {
    return '{' . $this->value . '}';
  }
}

final readonly class AddonUpdate
{
  public function __construct(
    public string $version,
    public string $update_link,
  ) {}
}

final readonly class UpdatesGenerator
{
  public function __construct(
    private string $addonsPath,
    private string $baseUrl,
  ) {}

  public function generate(): string
  {
    $addons = [];

    foreach (glob($this->addonsPath . '/*', GLOB_ONLYDIR) as $addonDir) {
      $uuid = Uuid::fromString(basename($addonDir));

      if ($uuid === null) {
        continue;
      }

      $updates = $this->scanAddonUpdates($addonDir, $uuid);

      if ($updates !== []) {
        $addons[$uuid->withBraces()] = ['updates' => $updates];
      }
    }

    return json_encode(
      ['addons' => $addons],
      JSON_UNESCAPED_SLASHES | JSON_THROW_ON_ERROR,
    );
  }

  private function scanAddonUpdates(string $addonDir, Uuid $uuid): array
  {
    $updates = [];

    foreach (glob($addonDir . '/*.{zip,xpi}', GLOB_BRACE) as $file) {
      if (!preg_match('/^(.+)-(\d+\.\d+\.\d+)\.(zip|xpi)$/', $filename = basename($file), $matches)) {
        continue;
      }

      $updates[] = new AddonUpdate(
        version: $matches[2],
        update_link: $this->baseUrl . '/' . $uuid->value . '/' . $filename,
      );
    }

    usort($updates, fn($a, $b) => version_compare($a->version, $b->version));

    return array_map(
      fn(AddonUpdate $u) => [
        'version' => $u->version,
        'update_link' => $u->update_link,
      ],
      $updates,
    );
  }
}

function main(): void
{
  $generator = new UpdatesGenerator(
    addonsPath: __DIR__,
    baseUrl: 'https://.../add-ons',
  );

  header('Content-Type: application/json');
  header('Cache-Control: max-age=60');

  echo $generator->generate();
}

// [TODO] add missing error handling
main();