488798 Website with any open source ( bidding within 4-5 days)

Hi I need to make website with the following feature 1- user login to upload files with specific extensions 2- user put price to each of his files. 3- user choose the payment method he likes 4- website owner get % of that price when any visitor buy this item 5- user can tweet or share this document in his page 6- there will be Facebook commenting tool .. 7- user can choose which category he will put his file IN 8- it will be great if there is something like blog to add articles. 9- website owner determine the extensions i need . 10- files would be secured ..only download for the one who pay Payment terms is 50% escrow then after website complete ..other 50% escrow and after site testing .. 100% payment. ( testing would takes 4-5 days ) I need open source . appropriated low price and sample of work would be great