| 1 | import type { IncomingMessage, RequestListener, ServerResponse } from 'node:http'; |
| 2 | |
| 3 | import { StatusCodes } from 'http-status-codes'; |
| 4 | |
| 5 | import { AbstractUIServer } from './AbstractUIServer'; |
| 6 | import { UIServerUtils } from './UIServerUtils'; |
| 7 | import { BaseError } from '../../exception'; |
| 8 | import { |
| 9 | ApplicationProtocolVersion, |
| 10 | type ProcedureName, |
| 11 | type Protocol, |
| 12 | type ProtocolRequest, |
| 13 | type ProtocolResponse, |
| 14 | type ProtocolVersion, |
| 15 | type RequestPayload, |
| 16 | ResponseStatus, |
| 17 | type UIServerConfiguration, |
| 18 | } from '../../types'; |
| 19 | import { |
| 20 | Constants, |
| 21 | generateUUID, |
| 22 | isNotEmptyString, |
| 23 | isNullOrUndefined, |
| 24 | logPrefix, |
| 25 | logger, |
| 26 | } from '../../utils'; |
| 27 | |
| 28 | const moduleName = 'UIHttpServer'; |
| 29 | |
| 30 | enum HttpMethods { |
| 31 | GET = 'GET', |
| 32 | PUT = 'PUT', |
| 33 | POST = 'POST', |
| 34 | PATCH = 'PATCH', |
| 35 | } |
| 36 | |
| 37 | export class UIHttpServer extends AbstractUIServer { |
| 38 | public constructor(protected readonly uiServerConfiguration: UIServerConfiguration) { |
| 39 | super(uiServerConfiguration); |
| 40 | } |
| 41 | |
| 42 | public start(): void { |
| 43 | this.httpServer.on('request', this.requestListener.bind(this) as RequestListener); |
| 44 | this.startHttpServer(); |
| 45 | } |
| 46 | |
| 47 | public sendRequest(request: ProtocolRequest): void { |
| 48 | switch (this.uiServerConfiguration.version) { |
| 49 | case ApplicationProtocolVersion.VERSION_20: |
| 50 | this.httpServer.emit('request', request); |
| 51 | break; |
| 52 | } |
| 53 | } |
| 54 | |
| 55 | public sendResponse(response: ProtocolResponse): void { |
| 56 | const [uuid, payload] = response; |
| 57 | try { |
| 58 | if (this.hasResponseHandler(uuid) === true) { |
| 59 | const res = this.responseHandlers.get(uuid) as ServerResponse; |
| 60 | res |
| 61 | .writeHead(this.responseStatusToStatusCode(payload.status), { |
| 62 | 'Content-Type': 'application/json', |
| 63 | }) |
| 64 | .end(JSON.stringify(payload)); |
| 65 | } else { |
| 66 | logger.error( |
| 67 | `${this.logPrefix(moduleName, 'sendResponse')} Response for unknown request id: ${uuid}`, |
| 68 | ); |
| 69 | } |
| 70 | } catch (error) { |
| 71 | logger.error( |
| 72 | `${this.logPrefix(moduleName, 'sendResponse')} Error at sending response id '${uuid}':`, |
| 73 | error, |
| 74 | ); |
| 75 | } finally { |
| 76 | this.responseHandlers.delete(uuid); |
| 77 | } |
| 78 | } |
| 79 | |
| 80 | public logPrefix = (modName?: string, methodName?: string, prefixSuffix?: string): string => { |
| 81 | const logMsgPrefix = prefixSuffix ? `UI HTTP Server ${prefixSuffix}` : 'UI HTTP Server'; |
| 82 | const logMsg = |
| 83 | isNotEmptyString(modName) && isNotEmptyString(methodName) |
| 84 | ? ` ${logMsgPrefix} | ${modName}.${methodName}:` |
| 85 | : ` ${logMsgPrefix} |`; |
| 86 | return logPrefix(logMsg); |
| 87 | }; |
| 88 | |
| 89 | private requestListener(req: IncomingMessage, res: ServerResponse): void { |
| 90 | this.authenticate(req, (err) => { |
| 91 | if (err) { |
| 92 | res |
| 93 | .writeHead(StatusCodes.UNAUTHORIZED, { |
| 94 | 'Content-Type': 'text/plain', |
| 95 | 'WWW-Authenticate': 'Basic realm=users', |
| 96 | }) |
| 97 | .end(`${StatusCodes.UNAUTHORIZED} Unauthorized`) |
| 98 | .destroy(); |
| 99 | req.destroy(); |
| 100 | } |
| 101 | }); |
| 102 | // Expected request URL pathname: /ui/:version/:procedureName |
| 103 | const [protocol, version, procedureName] = req.url?.split('/').slice(1) as [ |
| 104 | Protocol, |
| 105 | ProtocolVersion, |
| 106 | ProcedureName, |
| 107 | ]; |
| 108 | const uuid = generateUUID(); |
| 109 | this.responseHandlers.set(uuid, res); |
| 110 | try { |
| 111 | const fullProtocol = `${protocol}${version}`; |
| 112 | if (UIServerUtils.isProtocolAndVersionSupported(fullProtocol) === false) { |
| 113 | throw new BaseError(`Unsupported UI protocol version: '${fullProtocol}'`); |
| 114 | } |
| 115 | this.registerProtocolVersionUIService(version); |
| 116 | req.on('error', (error) => { |
| 117 | logger.error( |
| 118 | `${this.logPrefix(moduleName, 'requestListener.req.onerror')} Error on HTTP request:`, |
| 119 | error, |
| 120 | ); |
| 121 | }); |
| 122 | if (req.method === HttpMethods.POST) { |
| 123 | const bodyBuffer: Uint8Array[] = []; |
| 124 | req |
| 125 | .on('data', (chunk: Uint8Array) => { |
| 126 | bodyBuffer.push(chunk); |
| 127 | }) |
| 128 | .on('end', () => { |
| 129 | const body = JSON.parse(Buffer.concat(bodyBuffer).toString()) as RequestPayload; |
| 130 | this.uiServices |
| 131 | .get(version) |
| 132 | ?.requestHandler( |
| 133 | this.buildProtocolRequest( |
| 134 | uuid, |
| 135 | procedureName, |
| 136 | body ?? Constants.EMPTY_FROZEN_OBJECT, |
| 137 | ), |
| 138 | ) |
| 139 | .then((protocolResponse?: ProtocolResponse) => { |
| 140 | if (!isNullOrUndefined(protocolResponse)) { |
| 141 | this.sendResponse(protocolResponse!); |
| 142 | } |
| 143 | }) |
| 144 | .catch(Constants.EMPTY_FUNCTION); |
| 145 | }); |
| 146 | } else { |
| 147 | throw new BaseError(`Unsupported HTTP method: '${req.method}'`); |
| 148 | } |
| 149 | } catch (error) { |
| 150 | logger.error( |
| 151 | `${this.logPrefix(moduleName, 'requestListener')} Handle HTTP request error:`, |
| 152 | error, |
| 153 | ); |
| 154 | this.sendResponse(this.buildProtocolResponse(uuid, { status: ResponseStatus.FAILURE })); |
| 155 | } |
| 156 | } |
| 157 | |
| 158 | private responseStatusToStatusCode(status: ResponseStatus): StatusCodes { |
| 159 | switch (status) { |
| 160 | case ResponseStatus.SUCCESS: |
| 161 | return StatusCodes.OK; |
| 162 | case ResponseStatus.FAILURE: |
| 163 | return StatusCodes.BAD_REQUEST; |
| 164 | default: |
| 165 | return StatusCodes.INTERNAL_SERVER_ERROR; |
| 166 | } |
| 167 | } |
| 168 | } |