This code generates a QR code image containing contact information encoded as a vCard and displays it using a custom framework or library.

Run example

npm run import -- "generate a qr code using google APIs"

generate a qr code using google APIs

var util = require('util');
var importer = require('../Core');
var {request} = importer.import("https request");

var first = 'Elvis';
var last = 'Presley';
var phone = '5558675309';
var email = 'dawid@gmail.com';
var qr = `https://chart.googleapis.com/chart?chs=150x150&cht=qr&chl=BEGIN:VCARD%0AN:${first}%20${last}%0ATEL;CELL:${phone}%0AEMAIL:${email}%0AEND:VCARD`

console.log(qr);
$.async(request(qr)
         .then(r => $.png(new Buffer(r.body).toString('base64')))
         .catch(e => $.sendError(e)))

// Import required modules and functions
import { request } from 'node-fetch';
import { Buffer } from 'buffer';

// Define constants for user information
const FIRST_NAME = 'Elvis';
const LAST_NAME = 'Presley';
const PHONE_NUMBER = '5558675309';
const EMAIL_ADDRESS = 'dawid@gmail.com';

// Define a function to generate QR code URL
const generateQrUrl = () =>
  `https://chart.googleapis.com/chart?chs=150x150&cht=qr&chl=BEGIN:VCARD%0AN:${FIRST_NAME}%20${LAST_NAME}%0ATEL;CELL:${PHONE_NUMBER}%0AEMAIL:${EMAIL_ADDRESS}%0AEND:VCARD`;

// Define a function to handle QR code request and display
const handleQrRequest = async () => {
  try {
    // Send HTTP GET request to API
    const response = await request(generateQrUrl());

    // Convert response body to base64 encoded string
    const qrCode = new Buffer(response.body).toString('base64');

    // Display QR code as PNG image
    // Note: We assume that $.png and $.sendError are functions that can display and handle errors respectively.
    // However, Node.js does not have a built-in $.png function. This code snippet is just an example.
    $.png(qrCode);
  } catch (error) {
    // Handle any errors that occur during the request or display process
    $.sendError(error);
  }
};

// Call the handleQrRequest function
handleQrRequest();

// Print the QR code URL (Optional)
console.log(generateQrUrl());

This code snippet generates a QR code image from a vCard (digital contact card) and displays it.

Here's a breakdown:

1. Dependencies:

   • Requires the util module for utility functions.
   • Requires a custom importer module for importing other modules.
   • Imports the request module for making HTTP requests.

2. vCard Data:

   • Defines variables for the first name, last name, phone number, and email address of the contact.
   • Constructs a vCard string using these variables.

3. QR Code Generation:

   • Creates a URL for a QR code image using the Google Charts API, encoding the vCard string.
   • Uses request to fetch the QR code image from the URL.
   • Converts the image data from the response to a base64 string.

4. Image Display:

   • Uses a custom $.async function (likely from a framework or library) to handle asynchronous operations.
   • Passes the base64 image data to a custom $.png function (likely for displaying the image).
   • Includes error handling using catch to handle any errors during the process.

Purpose:

This code generates a QR code image that, when scanned, will display the contact information encoded within the vCard.