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

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