spus/web/i/index.node.js

var fs = require("fs");

module.exports = function(ctx) {
	var id = ctx.query.replace(/\..*/, "");
	if (!id)
		return ctx.err404();

	ctx.res.setHeader(
		"Cache-Control",
		"public, max-age="+ctx.conf.cache_max_age_images
	);

	var readStream = fs.createReadStream(ctx.conf.dir.imgs+"/"+id);
	readStream.pipe(ctx.res);

	readStream.on("error", function(err){
		if (err.code === "ENOENT")
			ctx.err404();
		else
			ctx.end(err.toString());
	});
}