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

   1 import type { IncomingMessage } from 'node:http'
   2
   3 import { BaseError } from '../../exception/index.js'
   4 import { Protocol, ProtocolVersion } from '../../types/index.js'
   5 import { logger, logPrefix } from '../../utils/index.js'
   6
   7 export const getUsernameAndPasswordFromAuthorizationToken = (
   8   authorizationToken: string,
   9   next: (err?: Error) => void
  10 ): [string, string] => {
  11   if (
  12     !/^([0-9a-zA-Z+/]{4})*(([0-9a-zA-Z+/]{2}==)|([0-9a-zA-Z+/]{3}=))?$/.test(authorizationToken)
  13   ) {
  14     next(new BaseError('Invalid basic authentication token format'))
  15   }
  16   const authentication = Buffer.from(authorizationToken, 'base64').toString()
  17   const authenticationParts = authentication.split(/:/)
  18   // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
  19   return [authenticationParts.shift()!, authenticationParts.join(':')]
  20 }
  21
  22 export const handleProtocols = (
  23   protocols: Set<string>,
  24   _request: IncomingMessage
  25 ): false | string => {
  26   let protocol: Protocol | undefined
  27   let version: ProtocolVersion | undefined
  28   if (protocols.size === 0) {
  29     return false
  30   }
  31   for (const fullProtocol of protocols) {
  32     if (isProtocolAndVersionSupported(fullProtocol)) {
  33       return fullProtocol
  34     }
  35   }
  36   logger.error(
  37     `${logPrefix(
  38       ' UI WebSocket Server |'
  39       // eslint-disable-next-line @typescript-eslint/restrict-template-expressions
  40     )} Unsupported protocol: '${protocol}' or protocol version: '${version}'`
  41   )
  42   return false
  43 }
  44
  45 export const isProtocolAndVersionSupported = (protocolStr: string): boolean => {
  46   const [protocol, version] = getProtocolAndVersion(protocolStr)
  47   return (
  48     Object.values(Protocol).includes(protocol) && Object.values(ProtocolVersion).includes(version)
  49   )
  50 }
  51
  52 export const getProtocolAndVersion = (protocolStr: string): [Protocol, ProtocolVersion] => {
  53   const protocolIndex = protocolStr.indexOf(Protocol.UI)
  54   const protocol = protocolStr.substring(
  55     protocolIndex,
  56     protocolIndex + Protocol.UI.length
  57   ) as Protocol
  58   const version = protocolStr.substring(protocolIndex + Protocol.UI.length) as ProtocolVersion
  59   return [protocol, version]
  60 }
  61
  62 export const isLoopback = (address: string): boolean => {
  63   // eslint-disable-next-line no-useless-escape
  64   return /^localhost$|^127(?:\.\d+){0,2}\.\d+$|^(?:0*\:)*?:?0*1$/i.test(address)
  65 }