php download based on random id

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Hello guyz,

Well i am storing some files on my server, i want only members to be able to download files. these are what i want to do :

I should have an initial URL like this : "http://mysite/file/{file_id}/filename.mov

so i will be checking to see if member is logged in, if yes then it should generate a temporary id which will expire within 1 day and start the download automatically!

 

I have coded the user class which checks if its logged in, and i am generating the id, but the problem is how to show the final file url like this : http://mysite/file/{sha1 or something very random}/filename.mov and let it to be downloaded.

 

thanks