src/charging-station/ui-server/ui-services/UIServiceUtils.ts

   1 import { 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 protocolIndex: number;
  17     let protocol: Protocol;
  18     let version: ProtocolVersion;
  19     for (const fullProtocol of protocols) {
  20       protocolIndex = fullProtocol.indexOf(Protocol.UI);
  21       protocol = fullProtocol.substring(
  22         protocolIndex,
  23         protocolIndex + Protocol.UI.length
  24       ) as Protocol;
  25       version = fullProtocol.substring(protocolIndex + Protocol.UI.length) as ProtocolVersion;
  26       if (UIServiceUtils.isProtocolSupported(protocol, version) === true) {
  27         return fullProtocol;
  28       }
  29     }
  30     logger.error(
  31       `${Utils.logPrefix(
  32         ' UI WebSocket Server |'
  33       )} Unsupported protocol: ${protocol} or protocol version: ${version}`
  34     );
  35     return false;
  36   };
  37
  38   public static isProtocolSupported = (protocol: Protocol, version: ProtocolVersion): boolean =>
  39     Object.values(Protocol).includes(protocol) && Object.values(ProtocolVersion).includes(version);
  40
  41   public static isLoopback(address: string): boolean {
  42     const isLoopbackRegExp = new RegExp(
  43       // eslint-disable-next-line no-useless-escape
  44       /^localhost$|^127(?:\.\d+){0,2}\.\d+$|^(?:0*\:)*?:?0*1$/,
  45       'i'
  46     );
  47     return isLoopbackRegExp.test(address);
  48   }
  49 }