uscis.js

let request = require('request');

let USCIS_CASE_STATUS_URL = 'https://egov.uscis.gov/casestatus/mycasestatus.do?appReceiptNum=';

class USCISCaseStatus {
  constructor(receipt_num, timestamp, title, content) {
    this.receipt_num = receipt_num;
    this.timestamp = timestamp;
    this.title = title;
    this.content = content;
  }

  static get(receipt_num) {
    return new Promise((resolve, _) => {
      let url = USCIS_CASE_STATUS_URL + receipt_num;
      request(url, (err, _, body) => {
        if (err) {
          resolve(new USCISCaseStatus(receipt_num, Date.now(), 'Errored', err.message));
          return;
        }
        let lines = body.split('\n');
        var titleIdx = 0;
        while (titleIdx < lines.length && !lines[titleIdx].match('<h1>'))
          titleIdx++;
        if (titleIdx === lines.length) {
          resolve(new USCISCaseStatus(receipt_num, Date.now(), 'Errored', 'Unable to parse HTML.'));
          return;
        }
        let title = lines[titleIdx].replace(/<[^>]*>/g, '').trim();
        let content = lines[titleIdx + 1].replace(/<[^>]*>/g, '').trim();
        if (title === '') {
          resolve(new USCISCaseStatus(receipt_num, Date.now(), 'Errored', 'Unable to parse HTML.'));
          return;
        }
        resolve(new USCISCaseStatus(receipt_num, Date.now(), title, content));
      });
    });
  }

  toString() {
    return this.receipt_num + ': ' + this.title + '\n' + (new Date(this.timestamp)).toString() + '\n\n' + this.content;
  }
}