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

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