const path = require("path");
const etag = require("etag");

const getContentTypeHeader = require("../utils/getContentTypeHeader");

function serveStaticFile(req, res) {
  const tags = ["file"];

  const ext = path.extname(req.entry.name).substr(1);
  if (ext) {
    tags.push(`${ext}-file`);
  }

  res
    .set({
      "Content-Length": req.entry.size,
      "Content-Type": getContentTypeHeader(req.entry.contentType),
      "Cache-Control": "public,max-age=31536000", // 1 year
      "Last-Modified": req.entry.lastModified,
      ETag: etag(req.entry.content),
      "Cache-Tag": tags.join(",")
    })
    .send(req.entry.content);
}

module.exports = serveStaticFile;