Youtube upload API

Users upload a video to my website. Then they send that video to Youtube from my website. I need a php script that will: - use the video file that they have uploaded to my server (eg, $video_filename = "/video/[login to view URL]") - show a link for users to click to authenticate with Youtube - after authenticating, the user is brought back to my server (to the same page, or a new one that you create) - user clicks a link to send their video, or even better is make the video get sent automatically after the user authenticates info to send to youtube: - video file (i will supply it as a PHP variable like $video_filename) - video title (need an input text box) - video description (need an input text area) - video category (choose from a drop down list) - video tags (need an input text box)