Wherein lies a microservice that resizes thumbnails, given to it by URLs. It is simple to configure and easy to use, and strives to just work.
You can install it by issuing go get github.com/unterstrich-kolkhoz/img-thumbnailer. But
beware: it requires ImageMagick!
The binary needs a configuration file to work. By default, thumbnailer searches
for a file named ./etc/img-thumbnailer/server.conf, but this can be changed by
supplying the -config flag.
The configuration can be in one of four directories, namely:
./<name>
/<name>
./<name>.local.conf (the first .conf will be replaced)
/<name>.local.conf (same here)
It can also be split up, in which case all matching files will be merged, in the precedence order above.
The image resizing part is tested, the uploading to S3 part is not—at least not through unit tests! PRs very welcome!
Have fun!