Ngix to Vercel redirects

ngix-to-vercel-redirects.js

const { readFileSync, writeFileSync, appendFileSync } = require("fs");
const ngixFile = "ngix-redirect-file.conf";
const jsonRedirectFile = "vercel.json";

ngixToVercelRedirect = (ngix) => {
  const ngixParts = ngix.split(" ");
  const ngixPath = ngixParts[1];
  const ngixDestination = ngixParts[2];
  const ngixStatusCode = ngixParts[3];

  let vercelPath = ngixPath.replace("^", "").replace("$1", "").replace("$", "");
  const vercelDestination = ngixDestination.replace("$1", "");
  const permanent = ngixStatusCode === "permanent;";
  const has = [];

  if (!vercelPath || !vercelDestination || !ngixStatusCode) return undefined;

  if (vercelPath.match(/\?/)) {
    const searchParams = new URLSearchParams(
      new URL("http://a.com" + vercelPath).search
    );
    searchParams.forEach((value, key) => {
      if (key && value) {
        has.push({
          type: "query",
          key,
          value,
        });
      }
    });
    vercelPath = vercelPath.split("?")[0];
  }
  return has.length
    ? {
        source: vercelPath,
        destination: vercelDestination,
        permanent,
        has,
      }
    : {
        source: vercelPath,
        destination: vercelDestination,
        permanent,
      };
};

writeFileSync(jsonRedirectFile, "");
readFileSync(ngixFile)
  .toString()
  .split("\n")
  .forEach((line) => {
    if (line !== "" && line.indexOf("#") === -1) {
      console.log(ngixToVercelRedirect(line));
      // append to json file
      const redirect = ngixToVercelRedirect(line);
      if (redirect) {
        appendFileSync(jsonRedirectFile, JSON.stringify(redirect) + ",");
      }
    }
  });