msw/lib/core/handlers/WebSocketHandler.mjs.map

Seamless REST/GraphQL API mocking library for browser and Node.js.

{"version":3,"sources":["../../../src/core/handlers/WebSocketHandler.ts"],"sourcesContent":["import { Emitter } from 'strict-event-emitter'\nimport { createRequestId } from '@mswjs/interceptors'\nimport type {\n  WebSocketClientConnectionProtocol,\n  WebSocketConnectionData,\n  WebSocketServerConnectionProtocol,\n} from '@mswjs/interceptors/WebSocket'\nimport {\n  type Match,\n  type Path,\n  type PathParams,\n  matchRequestUrl,\n} from '../utils/matching/matchRequestUrl'\nimport { getCallFrame } from '../utils/internal/getCallFrame'\nimport type { HandlerKind } from './common'\n\ntype WebSocketHandlerParsedResult = {\n  match: Match\n}\n\nexport type WebSocketHandlerEventMap = {\n  connection: [args: WebSocketHandlerConnection]\n}\n\nexport interface WebSocketHandlerConnection {\n  client: WebSocketClientConnectionProtocol\n  server: WebSocketServerConnectionProtocol\n  info: WebSocketConnectionData['info']\n  params: PathParams\n}\n\nexport interface WebSocketResolutionContext {\n  baseUrl?: string\n}\n\nexport const kEmitter = Symbol('kEmitter')\nexport const kSender = Symbol('kSender')\nconst kStopPropagationPatched = Symbol('kStopPropagationPatched')\nconst KOnStopPropagation = Symbol('KOnStopPropagation')\n\nexport class WebSocketHandler {\n  private readonly __kind: HandlerKind\n\n  public id: string\n  public callFrame?: string\n\n  protected [kEmitter]: Emitter<WebSocketHandlerEventMap>\n\n  constructor(private readonly url: Path) {\n    this.id = createRequestId()\n\n    this[kEmitter] = new Emitter()\n    this.callFrame = getCallFrame(new Error())\n    this.__kind = 'EventHandler'\n  }\n\n  public parse(args: {\n    url: URL\n    resolutionContext?: WebSocketResolutionContext\n  }): WebSocketHandlerParsedResult {\n    const clientUrl = new URL(args.url)\n\n    /**\n     * @note Remove the Socket.IO path prefix from the WebSocket\n     * client URL. This is an exception to keep the users from\n     * including the implementation details in their handlers.\n     */\n    clientUrl.pathname = clientUrl.pathname.replace(/^\\/socket.io\\//, '/')\n\n    const match = matchRequestUrl(\n      clientUrl,\n      this.url,\n      args.resolutionContext?.baseUrl,\n    )\n\n    return {\n      match,\n    }\n  }\n\n  public predicate(args: {\n    url: URL\n    parsedResult: WebSocketHandlerParsedResult\n  }): boolean {\n    return args.parsedResult.match.matches\n  }\n\n  public async run(\n    connection: Omit<WebSocketHandlerConnection, 'params'>,\n    resolutionContext?: WebSocketResolutionContext,\n  ): Promise<boolean> {\n    const parsedResult = this.parse({\n      url: connection.client.url,\n      resolutionContext,\n    })\n\n    if (!this.predicate({ url: connection.client.url, parsedResult })) {\n      return false\n    }\n\n    const resolvedConnection: WebSocketHandlerConnection = {\n      ...connection,\n      params: parsedResult.match.params || {},\n    }\n\n    return this.connect(resolvedConnection)\n  }\n\n  protected connect(connection: WebSocketHandlerConnection): boolean {\n    // Support `event.stopPropagation()` for various client/server events.\n    connection.client.addEventListener(\n      'message',\n      createStopPropagationListener(this),\n    )\n    connection.client.addEventListener(\n      'close',\n      createStopPropagationListener(this),\n    )\n\n    connection.server.addEventListener(\n      'open',\n      createStopPropagationListener(this),\n    )\n    connection.server.addEventListener(\n      'message',\n      createStopPropagationListener(this),\n    )\n    connection.server.addEventListener(\n      'error',\n      createStopPropagationListener(this),\n    )\n    connection.server.addEventListener(\n      'close',\n      createStopPropagationListener(this),\n    )\n\n    // Emit the connection event on the handler.\n    // This is what the developer adds listeners for.\n    return this[kEmitter].emit('connection', connection)\n  }\n}\n\nfunction createStopPropagationListener(handler: WebSocketHandler) {\n  return function stopPropagationListener(event: Event) {\n    const propagationStoppedAt = Reflect.get(event, 'kPropagationStoppedAt') as\n      | string\n      | undefined\n\n    if (propagationStoppedAt && handler.id !== propagationStoppedAt) {\n      event.stopImmediatePropagation()\n      return\n    }\n\n    Object.defineProperty(event, KOnStopPropagation, {\n      value(this: WebSocketHandler) {\n        Object.defineProperty(event, 'kPropagationStoppedAt', {\n          value: handler.id,\n        })\n      },\n      configurable: true,\n    })\n\n    // Since the same event instance is shared between all client/server objects,\n    // make sure to patch its `stopPropagation` method only once.\n    if (!Reflect.get(event, kStopPropagationPatched)) {\n      event.stopPropagation = new Proxy(event.stopPropagation, {\n        apply: (target, thisArg, args) => {\n          Reflect.get(event, KOnStopPropagation)?.call(handler)\n          return Reflect.apply(target, thisArg, args)\n        },\n      })\n\n      Object.defineProperty(event, kStopPropagationPatched, {\n        value: true,\n        // If something else attempts to redefine this, throw.\n        configurable: false,\n      })\n    }\n  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