It's easier than you think, and here I have described the whole setup of how you can create auto expiring, signed URLs in Nginx with just a few lines of code in your vhost configuration file.
Here you go
And just in case you want to generate these urls using PHP, Python, JavaScript or Java then head over to this repository at https://github.com/LearnWithHasinHayder/nginx-secure-link
Enjoy!
