koa-etag/dist/index.mjs

Koa ETag support middleware

// src/index.ts
import Stream from "stream";
import { Buffer } from "buffer";
import fs from "fs/promises";
import calculate from "etag";
async function getResponseEntity(ctx) {
  const body = ctx.body;
  if (!body || ctx.response.get("etag")) return;
  const status = Math.trunc(ctx.status / 100);
  if (status !== 2) return;
  if (body instanceof Stream) {
    if (!("path" in body) || typeof body.path !== "string") return;
    return fs.stat(body.path);
  }
  if (typeof body === "string" || Buffer.isBuffer(body)) return body;
  return JSON.stringify(body);
}
function etag(options) {
  console.warn(
    "[DEPRECATION WARNING] This package will be deprecated. Please use @koa/etag (v5+) instead."
  );
  return async function(ctx, next) {
    await next();
    const entity = await getResponseEntity(ctx);
    if (!entity) return;
    ctx.response.etag = calculate(entity, options);
  };
}
export {
  etag as default
};