@universal-middleware/compress/dist/chunk-OE4YTAMF.js

Universal compress middleware

// src/const.ts
var COMPRESSIBLE_CONTENT_TYPE_REGEX = /^\s*(?:text\/[^;\s]+|application\/(?:javascript|json|xml|xml-dtd|ecmascript|dart|postscript|rtf|tar|toml|vnd\.dart|vnd\.ms-fontobject|vnd\.ms-opentype|wasm|x-httpd-php|x-javascript|x-ns-proxy-autoconfig|x-sh|x-tar|x-virtualbox-hdd|x-virtualbox-ova|x-virtualbox-ovf|x-virtualbox-vbox|x-virtualbox-vdi|x-virtualbox-vhd|x-virtualbox-vmdk|x-www-form-urlencoded)|font\/(?:otf|ttf)|image\/(?:bmp|vnd\.adobe\.photoshop|vnd\.microsoft\.icon|vnd\.ms-dds|x-icon|x-ms-bmp)|message\/rfc822|model\/gltf-binary|x-shader\/x-fragment|x-shader\/x-vertex|[^;\s]+?\+(?:json|text|xml|yaml))(?:[;\s]|$)/i;

// src/encoding-header.ts
var simpleEncodingRegExp = /^\s*([^\s;]+)\s*(?:;(.*))?$/;
function parseAcceptEncodingHeader(accept) {
  const accepts = accept.split(",");
  const out = /* @__PURE__ */ new Map();
  let minQuality = 1;
  for (let i = 0; i < accepts.length; i++) {
    const encoding = parseEncoding(accepts[i].trim());
    if (encoding) {
      out.set(encoding.encoding, {
        ...encoding,
        index: i
      });
      minQuality = Math.min(minQuality, encoding.q || 1);
    }
  }
  if (!out.has("identity")) {
    out.set("identity", {
      encoding: "identity",
      q: minQuality,
      index: Number.MAX_SAFE_INTEGER
    });
  }
  return out;
}
function parseEncoding(str) {
  const match = simpleEncodingRegExp.exec(str);
  if (!match) return null;
  const encoding = match[1];
  let q = 1;
  if (match[2]) {
    const params = match[2].split(";");
    for (let j = 0; j < params.length; j++) {
      const p = params[j].trim().split("=");
      if (p[0] === "q") {
        q = Number.parseFloat(p[1]);
        break;
      }
    }
  }
  return {
    encoding,
    q
  };
}
function chooseBestEncoding(request, availableEncodings) {
  let bestEncoding = null;
  if (availableEncodings.length === 0) return null;
  const header = request.headers.get("Accept-Encoding");
  if (!header) return null;
  const parsed = parseAcceptEncodingHeader(header);
  for (const enc of availableEncodings) {
    const encodingEntry = parsed.get(enc);
    if (encodingEntry) {
      if (!bestEncoding || encodingEntry.q > bestEncoding.q || encodingEntry.q === bestEncoding.q && encodingEntry.index < bestEncoding.index) {
        bestEncoding = encodingEntry;
      }
    }
  }
  return bestEncoding?.encoding;
}

// src/runtime.ts
var isCompressionStreamAvailable = typeof CompressionStream !== "undefined";
var isZlibAvailable = await isNodeZlibAvailable();
var supportedEncodings = isZlibAvailable ? ["br", "gzip", "deflate"] : isCompressionStreamAvailable ? ["gzip", "deflate"] : [];
async function isNodeZlibAvailable() {
  try {
    await import(
      /* @vite-ignore */
      'node:zlib'
    );
    return true;
  } catch {
    return false;
  }
}

// src/compress.ts
var cacheControlNoTransformRegExp = /(?:^|,)\s*?no-transform\s*?(?:,|$)/i;
var EncodingGuesser = class {
  constructor(request, options = {}) {
    this.request = request;
    this.options = options;
    this.encoding = this._guessRequest();
  }
  request;
  options;
  encoding;
  _guessRequest() {
    if (this.request.method === "HEAD") {
      return null;
    }
    const cacheControl = this.request.headers.get("Cache-Control");
    if (cacheControl && cacheControlNoTransformRegExp.test(cacheControl)) {
      return null;
    }
    const chosenEncoding = chooseBestEncoding(this.request, supportedEncodings);
    if (!chosenEncoding || chosenEncoding === "identity") {
      return null;
    }
    return chosenEncoding;
  }
  guessEncoding(response) {
    if (this.encoding === null) return null;
    const threshold = this.options?.threshold ?? 1024;
    const cacheControl = response.headers.get("Cache-Control");
    if (cacheControl && cacheControlNoTransformRegExp.test(cacheControl)) {
      return null;
    }
    const contentLength = response.headers.get("Content-Length");
    if (contentLength && Number.parseInt(contentLength, 10) < threshold) {
      return null;
    }
    const contentType = response.headers.get("Content-Type");
    if (!contentType || !COMPRESSIBLE_CONTENT_TYPE_REGEX.test(contentType)) {
      return null;
    }
    const contentEncoding = response.headers.get("Content-Encoding") ?? "identity";
    if (contentEncoding !== "identity") {
      return null;
    }
    return this.encoding;
  }
};

// src/response.ts
async function guessCompressor(encoding) {
  if (isZlibAvailable) {
    const { compressStream: compressStream2 } = await import('./stream-X3AXMVWI.js');
    return (input) => compressStream2(input, encoding);
  }
  const { compressStream } = await import('./stream-UOPLJC3G.js');
  return (input) => compressStream(input, encoding);
}
var handleCompression = async (encoding, input, options) => {
  if (!input.headers.get("Vary")?.includes("Accept-Encoding")) input.headers.append("Vary", "Accept-Encoding");
  if (input.headers.get("Content-Encoding")) return input;
  const { headers, ...optionsRest } = options || {};
  const optionsHeaders = new Headers(headers);
  if (!optionsHeaders.get("Vary")?.includes("Accept-Encoding")) optionsHeaders.append("Vary", "Accept-Encoding");
  for (const [header, value] of optionsHeaders) {
    if (!(input.headers.get(header) ?? "").includes(value)) input.headers.append(header, value);
  }
  const compressor = await guessCompressor(encoding);
  const body = await compressor(input.body);
  if (body !== null) {
    input.headers.append("Content-Encoding", encoding);
    input.headers.delete("Content-Length");
  }
  return new Response(body, {
    headers: input.headers,
    status: optionsRest.status ?? input.status,
    statusText: optionsRest.statusText ?? input.statusText
  });
};

// src/middleware.ts
var compressMiddleware = ((options) => (request) => {
  const guesser = new EncodingGuesser(request);
  return function universalMiddlewareCompress(response) {
    const encoding = guesser.guessEncoding(response);
    if (!encoding) return response;
    return handleCompression(encoding, response, options);
  };
});
var middleware_default = compressMiddleware;

export { middleware_default };