Resolve API URL from string

resolve-api-path-from-string.js

const { URL } = require('url')
const assert = require('assert')

const DEFAULT_BASE = 'https://api.github.com'

/* Zero dependency backward compatible url parser */
function parseUrl(url) {
  const match = url.match(/^(https?)?(?:[\:\/]*)([a-z0-9\.-]*)(?:\:(\d+))?(\/[^?#]*)?(?:\?([^#]*))?(?:#(.*))?$/i)
  return {
    protocol: match[1] || '',
    host: match[2] || '',
    port: match[3] || '',
    path: match[4] || '',
    query: match[5] || '',
    fragment: match[6] || '',
  }
}

function getHost(url) {
  const data = parseUrl(url)
  let pathName = data.path
  if (!data.protocol && !data.path && url.indexOf('.') > -1) {
    pathName = data.host
  }
  if (!data.protocol && url.indexOf('.') === -1) {
   pathName = url
  }
  return {
    path: pathName,
    base: (!data.protocol) ? DEFAULT_BASE : `${data.protocol}://${data.host}`
  }
}

function resolvePath(pathOrUrl) {
  const urlInfo = getHost(pathOrUrl)
  return new URL(urlInfo.path, urlInfo.base)
}

const x = new URL('/lol', 'https://api.github.com')
console.log(x instanceof URL)
// console.log(new URL('/lol', 'https://api.github.com'))
// console.log(resolvePath('https://api.github.com/nice'))
// console.log(resolvePath('https://api.github.com/nice'))
// console.log(resolvePath('/coocococ/cool'))

assert.equal(resolvePath('https://api.github.com/nice').pathname, '/nice')
assert.equal(resolvePath('api.github.com/nice').pathname, '/nice')
assert.equal(resolvePath('nice').pathname, '/nice')
assert.equal(resolvePath('/nice').pathname, '/nice')
assert.equal(resolvePath('wow/nice').pathname, '/wow/nice')
assert.equal(resolvePath('/wow/nice').pathname, '/wow/nice')
assert.equal(resolvePath('https://api.github.com/wow/nice').pathname, '/wow/nice')