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