Change vod_hls_encryption_method based on arg or header

[aminvakil]

I was wondering if vod_hls_encryption_method could be changed based on each request for the same location.

We need to disable encryption for custom devices, and as disabling it everywhere requires to purge all caches at once, it is not acceptable for us. Therefore we want to add a specific query parameter which instructs the vod-module to either disable vod_hls_encryption_method or not, and purge cache by time.

So far I have understood that it cannot be given a custom variable and it has been set an enum in source code that does not accept any value expect what that has been defined.

Also we've added NGX_HTTP_SIF_CONF to its definition and was able to define it in an if condition in server block, but it wasn't enabled at all.

It seems like it cannot get changed on runtime, am I right?