getVercelBranchUrl.js

getVercelBranchUrl.js

const { createHash } = require("crypto");

function sha256(string) {
  return createHash("sha256").update(string).digest("hex");
}

const firstUrlMaxLength = 74;

/**
 *
 * https://vercel.com/docs/concepts/deployments/generated-urls#truncation
 *
 * @param {string} projectName
 * @param {string} branchName
 * @param {string} scopeName
 * @returns {string} the generated branch url
 */
const getVercelBranchUrl = (projectName, branchName, scopeName) => {
  const firstUrl =
    `${projectName}-git-${branchName}-${scopeName}.vercel.app`.replace(
      "/",
      "-"
    );

  if (firstUrl.length <= firstUrlMaxLength) return firstUrl;
  const temp = `git-${branchName}${projectName}`;
  const hash = sha256(temp).slice(0, 6);
  const secondPart = `-${hash}-${scopeName}`;
  return `${firstUrl.substring(
    0,
    firstUrlMaxLength - ".vercel.app".length - secondPart.length
  )}${secondPart}.vercel.app`.replace("/", "-");
};

module.exports = {
  getVercelBranchUrl,
};