Small application for distributing the work of tagging images into categories among multiple concurrent users. Uses GenServers for synchronizing an ImageServer with a folder in an S3-bucket.

A Behaviour with callbacks move_image_to_folder/2, fetch_images/0 and get_url/1 can be implemented to allow interfacing with a local folder structure or a different remote.

Based on a reviewer's tag, an image is moved to its appropriate folder in S3-bucket based on the tag. For configuration of tags, see: config/prod.secret.example.exs. For the provided S3-client, presigned URLs are used for get_url/1.

The ReviewServer and ImageServer synchronize to ensure that users are not served the same image, and that images are not "lost" eg. in case a Reviewer disconnects or discards an image. Additionally, the ReviewServer keeps track of a configurable amount of "history", allowing Reviewers to undo their tags, in case they got something wrong.

The entire front-end is just hacked wildly together as a meme, but should be easily replaceable. Same goes for the entire web portion of the Phoenix application.