app2-api/helpers/qr.helper.js

var _ = require("lodash");
var QRCode = require("qrcode");
const moment = require("moment");

const config = require("../config");

const luma = (color) => { // color can be a hx string or an array of RGB values 0-255
  const rgb = (typeof color === 'string') ? hexToRGBArray(color) : color;
  return (0.2126 * rgb[0]) + (0.7152 * rgb[1]) + (0.0722 * rgb[2]); // SMPTE C, Rec. 709 weightings
}

const hexToRGBArray = (color) => {
  if (color.length === 3)
    color = color.charAt(0) + color.charAt(0) + color.charAt(1) + color.charAt(1) + color.charAt(2) + color.charAt(2);
  else if (color.length !== 6)
    console.debug('Invalid hex color: ' + color);

  const rgb = [];
  for (var i = 0; i <= 2; i++)
    rgb[i] = parseInt(color.substr(i * 2, 2), 16);
  return rgb;
}

const calculateContrastingColor = (color) => {
  const _color = (typeof color === 'string') ? color.replace('#', '') : color;
  return (luma(_color) >= 165) ? '#000' : '#fff';
}


module.exports.getInscriptionQRCodeUrl = function (inscriptionId) {
  return encodeURI(`${config.server.public_url}/inscriptions/${inscriptionId}/qrimage`);
};

/* params = {
    code: 'xxxx',
    date: 'date-time',
    name: 'xxxx',
    surname: 'xxxx',
    color: '#ff',

} */

module.exports.getInscriptionQRCode = function (params) {
  return new Promise(function (resolve, reject) {
    var texto =
      _.padStart(params.code, 4, "0") +
      "\n" +
      moment(params.date).format("DD/MM/YY HH:mm ") +
      params.name +
      " " +
      params.surname;
    var options = {
      errorCorrectionLevel: "M",
    };

    if (params.color) {
      options = _.assign(options, {
        color: {
          light: params.color ? colourNameToHex(params.color) : "#000000",
          dark: calculateContrastingColor(params.color), //"#ffffff",
        },
      });
    }

    QRCode.toDataURL(texto, options, function (err, qrcode) {
      if (err) resolve("");
      //            console.log('xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx' + qrcode);
      resolve(qrcode);
    });
    /*
        QRCode.toString(texto, options, function (err, qrcode) {
            if (err) resolve('');
            console.log('xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx' + qrcode);
            resolve(qrcode);
        });
*/
  });
};

module.exports.generateQRConfig = function (params) {
  let qrConfig = null;
  if (params) {
    qrConfig = {
      name: params.name,
      surname: params.surname,
      date: params.date_inscription,
      code: params.code_ticket,
      color: params.color,
    };
  }
  return qrConfig;
};

function colourNameToHex(colour) {
  var colours = {
    aliceblue: "#f0f8ff",
    antiquewhite: "#faebd7",
    aqua: "#00ffff",
    aquamarine: "#7fffd4",
    azure: "#f0ffff",
    beige: "#f5f5dc",
    bisque: "#ffe4c4",
    blanchedalmond: "#ffebcd",
    blue: "#0000ff",
    blueviolet: "#8a2be2",
    brown: "#a52a2a",
    burlywood: "#deb887",
    cadetblue: "#5f9ea0",
    chartreuse: "#7fff00",
    chocolate: "#d2691e",
    coral: "#ff7f50",
    cornflowerblue: "#6495ed",
    cornsilk: "#fff8dc",
    crimson: "#dc143c",
    cyan: "#00ffff",
    darkblue: "#00008b",
    darkcyan: "#008b8b",
    darkgoldenrod: "#b8860b",
    darkgray: "#a9a9a9",
    darkgreen: "#006400",
    darkkhaki: "#bdb76b",
    darkmagenta: "#8b008b",
    darkolivegreen: "#556b2f",
    darkorange: "#ff8c00",
    darkorchid: "#9932cc",
    darkred: "#8b0000",
    darksalmon: "#e9967a",
    darkseagreen: "#8fbc8f",
    darkslateblue: "#483d8b",
    darkslategray: "#2f4f4f",
    darkturquoise: "#00ced1",
    darkviolet: "#9400d3",
    deeppink: "#ff1493",
    deepskyblue: "#00bfff",
    dimgray: "#696969",
    dodgerblue: "#1e90ff",
    firebrick: "#b22222",
    floralwhite: "#fffaf0",
    forestgreen: "#228b22",
    fuchsia: "#ff00ff",
    gainsboro: "#dcdcdc",
    ghostwhite: "#f8f8ff",
    gold: "#ffd700",
    goldenrod: "#daa520",
    gray: "#808080",
    green: "#008000",
    greenyellow: "#adff2f",
    honeydew: "#f0fff0",
    hotpink: "#ff69b4",
    "indianred ": "#cd5c5c",
    indigo: "#4b0082",
    ivory: "#fffff0",
    khaki: "#f0e68c",
    lavender: "#e6e6fa",
    lavenderblush: "#fff0f5",
    lawngreen: "#7cfc00",
    lemonchiffon: "#fffacd",
    lightblue: "#add8e6",
    lightcoral: "#f08080",
    lightcyan: "#e0ffff",
    lightgoldenrodyellow: "#fafad2",
    lightgrey: "#d3d3d3",
    lightgreen: "#90ee90",
    lightpink: "#ffb6c1",
    lightsalmon: "#ffa07a",
    lightseagreen: "#20b2aa",
    lightskyblue: "#87cefa",
    lightslategray: "#778899",
    lightsteelblue: "#b0c4de",
    lightyellow: "#ffffe0",
    lime: "#00ff00",
    limegreen: "#32cd32",
    linen: "#faf0e6",
    magenta: "#ff00ff",
    maroon: "#800000",
    mediumaquamarine: "#66cdaa",
    mediumblue: "#0000cd",
    mediumorchid: "#ba55d3",
    mediumpurple: "#9370d8",
    mediumseagreen: "#3cb371",
    mediumslateblue: "#7b68ee",
    mediumspringgreen: "#00fa9a",
    mediumturquoise: "#48d1cc",
    mediumvioletred: "#c71585",
    midnightblue: "#191970",
    mintcream: "#f5fffa",
    mistyrose: "#ffe4e1",
    moccasin: "#ffe4b5",
    navajowhite: "#ffdead",
    navy: "#000080",
    oldlace: "#fdf5e6",
    olive: "#808000",
    olivedrab: "#6b8e23",
    orange: "#ffa500",
    orangered: "#ff4500",
    orchid: "#da70d6",
    palegoldenrod: "#eee8aa",
    palegreen: "#98fb98",
    paleturquoise: "#afeeee",
    palevioletred: "#d87093",
    papayawhip: "#ffefd5",
    peachpuff: "#ffdab9",
    peru: "#cd853f",
    pink: "#ffc0cb",
    plum: "#dda0dd",
    powderblue: "#b0e0e6",
    purple: "#800080",
    rebeccapurple: "#663399",
    red: "#ff0000",
    rosybrown: "#bc8f8f",
    royalblue: "#4169e1",
    saddlebrown: "#8b4513",
    salmon: "#fa8072",
    sandybrown: "#f4a460",
    seagreen: "#2e8b57",
    seashell: "#fff5ee",
    sienna: "#a0522d",
    silver: "#c0c0c0",
    skyblue: "#87ceeb",
    slateblue: "#6a5acd",
    slategray: "#708090",
    snow: "#fffafa",
    springgreen: "#00ff7f",
    steelblue: "#4682b4",
    tan: "#d2b48c",
    teal: "#008080",
    thistle: "#d8bfd8",
    tomato: "#ff6347",
    turquoise: "#40e0d0",
    violet: "#ee82ee",
    wheat: "#f5deb3",
    whitesmoke: "#f5f5f5",
    yellow: "#ffff00",
    yellowgreen: "#9acd32",
  };

  if (typeof colours[colour.toLowerCase()] != "undefined") return colours[colour.toLowerCase()];

  return "#000000";
}