Is my invitation based file access authorization scheme worthwhile?

I need to allow users to upload files with sensitive data to a server, then invite other authenticated users to access specific files.This is my proposed solution:Each user will have his own folder to which he uploads files, and the parent folder will have an .htaccess with deny all to block direct access. (This already works well.)Then, an invited user will get a generated SHA1 invitation id and the url will be something like download/[sha1]/file and I can then use my controller to check

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