Middleware that dynamically resizes image to (almost) a specified width/height.
On the Metropolis website, static media was directly served from the uploaded version, which were usually unnecessarily larger and were not in a optimal format (e.g. PNG).
In order to speed up loading times, I developed this to transparently1 reduce bandwidth used. A quick search did not turn up a simple reverse proxy that I could put transparently (i.e. disables itself if not explicitly used) and has the least amount of features I need. (Actually, Patrick found https://github.com/cshum/imagor , which is a more complex version of this… Literature surveys are important!)
To run, compile cmd/proxy and run it with -net and -addr to specify the
network and address (e.g. -net unix -addr /run/komorebi.sock).
/<path>?w=&h=&fmt=
where
<path> is the source path of the file
w is the width (0 to leave blank)
h is the height (0 to leave blank)
fmt is the format (only webp is supported)
- clamp width and height of the resultant image
- store metrics and clear cache from most unused
- more formats (JPEG, PNG, AVIF)
Footnotes
-
We only reverse proxy to Komorebi when there is a
width=[0-9]+pxrequest query parameter. ↩