private static function createExternalCaFile($baseFolder)
    {
        $path = \tempnam($baseFolder, "dropbox-php-sdk-trusted-certs");
        if ($path === false) {
            throw new \Exception("Couldn't create temp file in folder ".Util::q($baseFolder).".");
        }
        \register_shutdown_function(function() use ($path) {
            \unlink($path);
        });

        // NOTE: Can't use the standard PHP copy().  That would clobber the locked-down
        // permissions set by tempnam().
        self::copyInto(__DIR__.self::$originalPath, $path);

        return $path;
    }
private static function createExternalCaFile($baseFolder)
    {
        $path = \tempnam($baseFolder, "dropbox-php-sdk-trusted-certs");
        if ($path === false) {
            throw new \Exception("Couldn't create temp file in folder ".Util::q($baseFolder).".");
        }
        \register_shutdown_function(function() use ($path) {
            \unlink($path);
        });

        // NOTE: Can't use the standard PHP copy().  That would clobber the locked-down
        // permissions set by tempnam().
        self::copyInto(__DIR__.self::$originalPath, $path);

        return $path;
    }
@param string $baseFolder

@return string