A plugin for Mattermost that uses a steganography library to add a hidden string in an image uploaded to the server.
Supports PNG & JPG.
To view the encoded message/watermark in the file, run go run decode.go. For example:
$ go run decode.go assets/test.png
This is an image that has been uploaded to Mattermostmake
This will produce a single plugin file (with support for multiple architectures) for upload to your Mattermost server:
dist/com.github.scottleedavis.mattermost-plugin-watermark.tar.gz