@busy-hour/blaze/dist/esm/middlewares/cors.js

<h1 align='center'>🔥 Blaze</h1> <div align='center'> An event driven framework for 🔥 Hono.js </div>

// src/middlewares/cors.ts
import { BlazeContext } from "../internal/context/index.js";
var defaults = {
  origin: "*",
  allowMethods: ["HEAD", "POST", "PUT", "PATCH", "GET", "DELETE"],
  allowHeaders: [],
  exposeHeaders: []
};
function findAllowOrigin(optsOrigin) {
  if (typeof optsOrigin === "string") {
    return () => optsOrigin;
  }
  if (typeof optsOrigin === "function") {
    return optsOrigin;
  }
  return (origin) => optsOrigin.includes(origin) ? origin : optsOrigin[0];
}
function set(honoCtx) {
  return function set2(key, value) {
    honoCtx.res.headers.set(key, value);
  };
}
function cors(options = defaults) {
  const opts = {
    ...defaults,
    ...options
  };
  return async function cors2(honoCtx, next) {
    const setRes = set(honoCtx);
    const ctx = new BlazeContext({
      body: null,
      honoCtx,
      headers: null,
      meta: null,
      params: null,
      query: null
    });
    const allowOrigin = findAllowOrigin(opts.origin)(
      honoCtx.req.header("origin") || "",
      ctx
    );
    if (allowOrigin) {
      setRes("Access-Control-Allow-Origin", allowOrigin);
    }
    if (opts.origin !== "*") {
      setRes("Vary", "Origin");
    }
    if (opts.credentials) {
      setRes("Access-Control-Allow-Credentials", "true");
    }
    if (opts.exposeHeaders?.length) {
      setRes("Access-Control-Expose-Headers", opts.exposeHeaders.join(","));
    }
    if (honoCtx.req.method === "OPTIONS") {
      if (opts.maxAge != null) {
        setRes("Access-Control-Max-Age", opts.maxAge.toString());
      }
      if (opts.allowMethods?.length) {
        setRes("Access-Control-Allow-Methods", opts.allowMethods.join(","));
      }
      let headers = opts.allowHeaders;
      if (!headers?.length) {
        const requestHeaders = honoCtx.req.header(
          "Access-Control-Request-Headers"
        );
        if (requestHeaders) {
          headers = requestHeaders.split(/\s*,\s*/);
        }
      }
      if (headers?.length) {
        setRes("Access-Control-Allow-Headers", headers.join(","));
        honoCtx.res.headers.append("Vary", "Access-Control-Request-Headers");
      }
      honoCtx.res.headers.delete("Content-Length");
      honoCtx.res.headers.delete("Content-Type");
      return new Response(null, {
        headers: honoCtx.res.headers,
        status: 204,
        statusText: honoCtx.res.statusText
      });
    }
    await next();
  };
}
export {
  cors
};