node-red-contrib-services-mentor/services/utils.js

Mentor Services

    /* Usage
    // example usage:
    checkInternet(function(isConnected) {
        if (isConnected) {
            // connected to the internet
        } else {
            // not connected to the internet
        }
    });
    */
    module.exports.checkInternet = (cb) =>
    {
        require('dns').lookup('google.com',function(err) {
            if (err && err.code == "ENOTFOUND") {
                cb(false);
            } else {
                cb(true);
            }
            })
        };

    module.exports.encode = (texto) =>
    {
        var indx1;
        var limite;
        var texto_codificado = "";
        var code = Buffer.from(texto, 'utf-8');

        texto_codificado = new Buffer.from("");
        indx1 = 1;
        limite = 3;
        for (indx = 0; indx < code.length; indx += 1)
        {
            if (indx1 == limite)
            {
                indx1 = 1;
                limite += 1;
            }

            if (indx1 % 2 == 0) {
                tem_cod = code.readUInt8(indx) + 1 ;
            } else {
                tem_cod = code.readUInt8(indx) - 1 ;
            }
            
            buffer1 = Buffer.from(texto_codificado);
            buffer2 = Buffer.from([tem_cod]);
            if (indx % 2 == 0) {
               texto_codificado = Buffer.concat([buffer1,buffer2]);
            } else {
               texto_codificado = Buffer.concat([buffer2,buffer1]);
            }
            indx1 += 1;
        }
        
        code = texto_codificado;
        texto_codificado = Buffer.from("");
        for (indx = 0; indx < code.length; indx += 1)
        {
            tem_cod = code.readUInt8(indx);

            buffer1 = Buffer.from(texto_codificado);
            buffer2 = Buffer.from([tem_cod]);
            if (indx % 2 == 0) {
               texto_codificado = Buffer.concat([buffer2,buffer1]);
            } else {
               texto_codificado = Buffer.concat([buffer1,buffer2]);
            }
        }

        code = texto_codificado;
        texto_codificado = Buffer.from("");
        for (indx = 0; indx < code.length; indx += 1)
        {
            tem_cod = code.readUInt8(indx);

            buffer1 = Buffer.from(texto_codificado);
            buffer2 = Buffer.from([tem_cod]);
            if (indx % 2 == 0) {
                texto_codificado = Buffer.concat([buffer1,buffer2]);
            } else {
              texto_codificado = Buffer.concat([buffer2,buffer1]);
            }
        }
      
        delete buffer1;
        delete buffer2;
        delete code;
        return texto_codificado.toString();
    };


    // helper functions
/**
 * @description This function returns the time as an object in three different formats
 * @returns {} time as object with parameters:
 * @returns {} obj.timeObject - Javascript Date Object
 * @returns String obj.year - year-month-date, hours:minutes:sec:ms
 * @returns String obj.time - hours:minutes:sec:ms
 */

    module.exports.timestamp =  () => {
    const myDate = new Date();
    let month = myDate.getMonth() + 1;
  
    switch (month) {
      case 1: month = 'Jan'; break;
      case 2: month = 'Feb'; break;
      case 3: month = 'Mar'; break;
      case 4: month = 'Apr'; break;
      case 5: month = 'May'; break;
      case 6: month = 'Jun'; break;
      case 7: month = 'Jul'; break;
      case 8: month = 'Aug'; break;
      case 9: month = 'Sep'; break;
      case 10: month = 'Oct'; break;
      case 11: month = 'Nov'; break;
      case 12: month = 'Dec'; break;
      default: month = 'Jan'; break;
    }
    return {
      format_Object: myDate,
      format_year: myDate.getFullYear() + '-' + (myDate.getMonth() + 1) + '-' + myDate.getDate() + ', ' + myDate.getHours() + ':' + myDate.getMinutes() + ':' + myDate.getSeconds() + ':' + myDate.getMilliseconds(),
      format_time: myDate.getHours() + ':' + myDate.getMinutes() + ':' + myDate.getSeconds() + ':' + myDate.getMilliseconds(),
      format_NodeRed: myDate.getDate() + ' ' + month + ' ' + myDate.getHours() + ':' + myDate.getMinutes() + ':' + myDate.getSeconds(),
    };
  };

  /**
 * @description
 * Checks if the given value is an numeric value or a string representing a numeric value
 * @param {anyVal} n - A value that has to be tested
 * @returns {bool} true in case of a numeric value else false
 * console.log(isNumeric(true)) //false
 * console.log(isNumeric(1))     //true
 * console.log(isNumeric(1.01))  //true
 * console.log(isNumeric(1e10))  //true
 * console.log(isNumeric('1'))   //true
 * console.log(isNumeric('1.4')) //true
 * console.log(isNumeric('1e5')) //true
 * console.log(isNumeric('a'))   //false
 * console.log(isNumeric('1a'))  //false
 */

 module.exports.isNumeric = (n) => {
    return !isNaN(parseFloat(n)) && isFinite(n);
  };

  /**
   * @description
   * Checks if the given value is an float value
   * @param {anyVal} n - A value that has to be tested
   * @returns {bool} true in case of a float value else false
   * console.log(isFloat(1.01))  //true
   *  console.log(isFloat(-1.01)) //true
   *  console.log(isFloat(1))     //false
   *  console.log(isFloat(1e10))  //false
   *  console.log(isFloat('1.4')) //false
   *  console.log(isFloat('-1.4'))//false
   *  console.log(isFloat('1e5')) //false
   *  console.log(isFloat('a'))   //false
   *  console.log(isFloat('1a'))  //false
   *  console.log(isFloat(true))  //false
   */
  
  module.exports.isFloat = (value) => {
    if (typeof value === 'number') {
      return (value % 1 !== 0);
    }
    return false;
  };

  /**
     * @description Creates an array with the length 'len' and fill it with 'val'
     * @param	{Number} - Length of the return Array
     * @param	{String|Number|Object|Array|bool|etc} - Value of each digit
     * @returns	{Array} Array with the length 'len' and fill it with 'val'
     * @example
     * FilledArray(3,'0');  //returns ['0','0','0']
     */
    
    module.exports.FilledArray = (len, val) =>  {
        const array = [];
        for (let i = 0; i < len; i++) {
        array[i] = val;
        }
        return array;
    };