Embed/embed plugin uses the server default temporary file path instead of the one set in Drupal

While this isn't a bug in this module per se, the vendor plugin that this module depends on - embed/embed - makes this module entirely unusable for a number of our clients.

We saw the following error:

Embed\Exceptions\EmbedException: The temporary folder "/tmp" is not writable in Embed\RequestResolvers\Curl->resolve() (line 147 of /vendor/embed/embed/src/RequestResolvers/Curl.php).

The embed plugin has the following code:

self::$tmpCookies = str_replace('//', '/', sys_get_temp_dir().'/embed-cookies.'.uniqid());

sys_get_temp_dir() returns the server defined temporary directory, NOT the one defined in drupal.

In our client's case, there are a large number of sub clients on the same server, and as a result they have extremely strict open_basedir restrictions. The server temp path of '/tmp' is simply not open for writing.

If it's possible to use a different vendor that might be a good idea. (Or figure out how to pass the Drupal temp directory setting to that vendor and have them use that instead.)