src/charging-station/ui-server/UIServerUtils.ts

   1 import type { IncomingMessage } from 'http';
   2
   3 import { Protocol, ProtocolVersion } from '../../types/UIProtocol';
   4 import logger from '../../utils/Logger';
   5 import Utils from '../../utils/Utils';
   6
   7 export class UIServerUtils {
   8   private constructor() {
   9     // This is intentional
  10   }
  11
  12   public static handleProtocols = (
  13     protocols: Set<string>,
  14     // eslint-disable-next-line @typescript-eslint/no-unused-vars
  15     request: IncomingMessage
  16   ): string | false => {
  17     let protocol: Protocol;
  18     let version: ProtocolVersion;
  19     if (protocols.size === 0) {
  20       return false;
  21     }
  22     for (const fullProtocol of protocols) {
  23       if (UIServerUtils.isProtocolAndVersionSupported(fullProtocol) === true) {
  24         return fullProtocol;
  25       }
  26     }
  27     logger.error(
  28       `${Utils.logPrefix(
  29         ' UI WebSocket Server |'
  30       )} Unsupported protocol: ${protocol} or protocol version: ${version}`
  31     );
  32     return false;
  33   };
  34
  35   public static isProtocolAndVersionSupported = (protocolStr: string): boolean => {
  36     const [protocol, version] = UIServerUtils.getProtocolAndVersion(protocolStr);
  37     return (
  38       Object.values(Protocol).includes(protocol) === true &&
  39       Object.values(ProtocolVersion).includes(version) === true
  40     );
  41   };
  42
  43   public static getProtocolAndVersion = (protocolStr: string): [Protocol, ProtocolVersion] => {
  44     const protocolIndex = protocolStr.indexOf(Protocol.UI);
  45     const protocol = protocolStr.substring(
  46       protocolIndex,
  47       protocolIndex + Protocol.UI.length
  48     ) as Protocol;
  49     const version = protocolStr.substring(protocolIndex + Protocol.UI.length) as ProtocolVersion;
  50     return [protocol, version];
  51   };
  52
  53   public static isLoopback(address: string): boolean {
  54     const isLoopbackRegExp = new RegExp(
  55       // eslint-disable-next-line no-useless-escape
  56       /^localhost$|^127(?:\.\d+){0,2}\.\d+$|^(?:0*\:)*?:?0*1$/,
  57       'i'
  58     );
  59     return isLoopbackRegExp.test(address);
  60   }
  61 }