SalesforceID.js

SalesforceID.js

/**
 * helper class to manage incrementing salesforce ids
 * Author: CloudAnswers
 * License: AGPL3
 */

const caseSafeId = require("./caseSafeId");
const base62 = require("base-x")(
  "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
);
const base10 = require("base-x")("0123456789");

class SalesforceID {
  prefix = "";
  suffix = "";
  number = 0;
  constructor(id) {
    if (!id) return;
    if (typeof id !== "string") {
      throw new Error("not string:" + id);
    }
    if (id.length < 15) {
      throw new Error("string too short:" + JSON.stringify(id));
    }
    id = caseSafeId(id).substr(0, 15); // chop off last 3 since it's checksum, not part of the number
    this.prefix = id.substring(0, 5);
    this.suffix = id.substring(5);
    var idAsBuffer = base62.decode(this.suffix);
    this.number = new Number(base10.encode(idAsBuffer));
  }
  next(increment = 1) {
    var nextSalesforceId = new SalesforceID();
    nextSalesforceId.prefix = this.prefix;
    nextSalesforceId.number = this.number + increment;
    return nextSalesforceId;
  }
  toString() {
    let encodedString = base62.encode(base10.decode(this.number.toString()));
    // remove leading zeros
    encodedString = encodedString.replace(/^0+/, "");
    // set to right length
    encodedString = encodedString.padStart(10, "0");
    encodedString = this.prefix + encodedString;

    return caseSafeId(encodedString);
  }
}

module.exports = SalesforceID;