Dev Diary Entry #56
Dear diary, the part of the website that allows users to post their own articles - based on an robust rights system - through a rich text editor, is done! It has a revision system and everything. Now to work on a secure way for them to upload images and use these in their articles, as I don't allow links to external images on the site.

Dev Diary Entry #57
Dear diary, today I finally finished the image uploading feature for my website, and I have secured it as well as I can.

First, I check filesize and filetype client-side (for user convenience), then I check the same things serverside, and only allow images in certain formats to be uploaded.

Next, I completely disregard the original filename (and extension) of the image and generate UUIDs for them instead, and use fileinfo/mimetype to determine extension. I then recreate the image serverside, either in original dimensions or downsized if too large, and store the new image (and its thumbnail) in a non-shared, private folder outside the webpage root, inaccessible to other users, and add an image entry in my database that contains the file path, user who uploaded it, all that jazz.

I then serve the image to the users through a server-side script instead of allowing them direct access to the image. Great success. What could possibly go horribly wrong?

Dev Diary Entry #58
Dear diary, I am contemplating scrapping the idea of allowing users to upload images, text, comments or any other contents to the website, since I do not have the capacity to implement the copyright-filter that will probably soon become a requirement in the EU... :(

Wat to do, wat to do...