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Copyright (c) .NET Foundation. All rights reserved.\r\n// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.\r\n\r\nimport { DefaultHttpClient } from \"./DefaultHttpClient\";\r\nimport { HttpClient } from \"./HttpClient\";\r\nimport { IConnection } from \"./IConnection\";\r\nimport { IHttpConnectionOptions } from \"./IHttpConnectionOptions\";\r\nimport { ILogger, LogLevel } from \"./ILogger\";\r\nimport { HttpTransportType, ITransport, TransferFormat } from \"./ITransport\";\r\nimport { LongPollingTransport } from \"./LongPollingTransport\";\r\nimport { ServerSentEventsTransport } from \"./ServerSentEventsTransport\";\r\nimport { Arg, createLogger } from \"./Utils\";\r\nimport { WebSocketTransport } from \"./WebSocketTransport\";\r\n\r\n/** @private */\r\nconst enum ConnectionState {\r\n    Connecting,\r\n    Connected,\r\n    Disconnected,\r\n}\r\n\r\n/** @private */\r\nexport interface INegotiateResponse {\r\n    connectionId?: string;\r\n    availableTransports?: IAvailableTransport[];\r\n    url?: string;\r\n    accessToken?: string;\r\n    error?: string;\r\n}\r\n\r\n/** @private */\r\nexport interface IAvailableTransport {\r\n    transport: keyof typeof HttpTransportType;\r\n    transferFormats: Array<keyof typeof TransferFormat>;\r\n}\r\n\r\nconst MAX_REDIRECTS = 100;\r\n\r\nlet WebSocketModule: any = null;\r\nlet EventSourceModule: any = null;\r\nif (typeof window === \"undefined\" && typeof require !== \"undefined\") {\r\n    // In order to ignore the dynamic require in webpack builds we need to do this magic\r\n    // @ts-ignore: TS doesn't know about these names\r\n    const requireFunc = typeof __webpack_require__ === \"function\" ? __non_webpack_require__ : require;\r\n    WebSocketModule = requireFunc(\"ws\");\r\n    EventSourceModule = requireFunc(\"eventsource\");\r\n}\r\n\r\n/** @private */\r\nexport class HttpConnection implements IConnection {\r\n    private connectionState: ConnectionState;\r\n    private baseUrl: string;\r\n    private readonly httpClient: HttpClient;\r\n    private readonly logger: ILogger;\r\n    private readonly options: IHttpConnectionOptions;\r\n    private transport?: ITransport;\r\n    private startPromise?: Promise<void>;\r\n    private stopError?: Error;\r\n    private accessTokenFactory?: () => string | Promise<string>;\r\n\r\n    public readonly features: any = {};\r\n    public onreceive: ((data: string | ArrayBuffer) => void) | null;\r\n    public onclose: ((e?: Error) => void) | null;\r\n\r\n    constructor(url: string, options: IHttpConnectionOptions = {}) {\r\n        Arg.isRequired(url, \"url\");\r\n\r\n        this.logger = createLogger(options.logger);\r\n        this.baseUrl = this.resolveUrl(url);\r\n\r\n        options = options || {};\r\n        options.logMessageContent = options.logMessageContent || false;\r\n\r\n        const isNode = typeof window === \"undefined\";\r\n        if (!isNode && typeof WebSocket !== \"undefined\" && !options.WebSocket) {\r\n            options.WebSocket = WebSocket;\r\n        } else if (isNode && !options.WebSocket) {\r\n            if (WebSocketModule) {\r\n                options.WebSocket = WebSocketModule;\r\n            }\r\n        }\r\n\r\n        if (!isNode && typeof EventSource !== \"undefined\" && !options.EventSource) {\r\n            options.EventSource = EventSource;\r\n        } else if (isNode && !options.EventSource) {\r\n            if (typeof EventSourceModule !== \"undefined\") {\r\n                options.EventSource = EventSourceModule;\r\n            }\r\n        }\r\n\r\n        this.httpClient = options.httpClient || new DefaultHttpClient(this.logger);\r\n        this.connectionState = ConnectionState.Disconnected;\r\n        this.options = options;\r\n        this.onreceive = null;\r\n        this.onclose = null;\r\n    }\r\n\r\n    public start(): Promise<void>;\r\n    public start(transferFormat: TransferFormat): Promise<void>;\r\n    public start(transferFormat?: TransferFormat): Promise<void> {\r\n        transferFormat = transferFormat || TransferFormat.Binary;\r\n\r\n        Arg.isIn(transferFormat, TransferFormat, \"transferFormat\");\r\n\r\n        this.logger.log(LogLevel.Debug, `Starting connection with transfer format '${TransferFormat[transferFormat]}'.`);\r\n\r\n        if (this.connectionState !== ConnectionState.Disconnected) {\r\n            return Promise.reject(new Error(\"Cannot start a connection that is not in the 'Disconnected' state.\"));\r\n        }\r\n\r\n        this.connectionState = ConnectionState.Connecting;\r\n\r\n        this.startPromise = this.startInternal(transferFormat);\r\n        return this.startPromise;\r\n    }\r\n\r\n    public send(data: string | ArrayBuffer): Promise<void> {\r\n        if (this.connectionState !== ConnectionState.Connected) {\r\n            throw new Error(\"Cannot send data if the connection is not in the 'Connected' State.\");\r\n        }\r\n\r\n        // Transport will not be null if state is connected\r\n        return this.transport!.send(data);\r\n    }\r\n\r\n    public async stop(error?: Error): Promise<void> {\r\n        this.connectionState = ConnectionState.Disconnected;\r\n        // Set error as soon as possible otherwise there is a race between\r\n        // the transport closing and providing an error and the error from a close message\r\n        // We would prefer the close message error.\r\n        this.stopError = error;\r\n\r\n        try {\r\n            await this.startPromise;\r\n        } catch (e) {\r\n            // this exception is returned to the user as a rejected Promise from the start method\r\n        }\r\n\r\n        // The transport's onclose will trigger stopConnection which will run our onclose event.\r\n        if (this.transport) {\r\n            await this.transport.stop();\r\n            this.transport = undefined;\r\n        }\r\n    }\r\n\r\n    private async startInternal(transferFormat: TransferFormat): Promise<void> {\r\n        // Store the original base url and the access token factory since they may change\r\n        // as part of negotiating\r\n        let url = this.baseUrl;\r\n        this.accessTokenFactory = this.options.accessTokenFactory;\r\n\r\n        try {\r\n            if (this.options.skipNegotiation) {\r\n                if (this.options.transport === HttpTransportType.WebSockets) {\r\n                    // No need to add a connection ID in this case\r\n                    this.transport = this.constructTransport(HttpTransportType.WebSockets);\r\n                    // We should just call connect directly in this case.\r\n                    // No fallback or negotiate in this case.\r\n                    await this.transport!.connect(url, transferFormat);\r\n                } else {\r\n                    throw Error(\"Negotiation can only be skipped when using the WebSocket transport directly.\");\r\n                }\r\n            } else {\r\n                let negotiateResponse: INegotiateResponse | null = null;\r\n                let redirects = 0;\r\n\r\n                do {\r\n                    negotiateResponse = await this.getNegotiationResponse(url);\r\n                    // the user tries to stop the connection when it is being started\r\n                    if (this.connectionState === ConnectionState.Disconnected) {\r\n                        return;\r\n                    }\r\n\r\n                    if (negotiateResponse.error) {\r\n                        throw Error(negotiateResponse.error);\r\n                    }\r\n\r\n                    if ((negotiateResponse as any).ProtocolVersion) {\r\n                        throw Error(\"Detected a connection attempt to an ASP.NET SignalR Server. This client only supports connecting to an ASP.NET Core SignalR Server. See https://aka.ms/signalr-core-differences for details.\");\r\n                    }\r\n\r\n                    if (negotiateResponse.url) {\r\n                        url = negotiateResponse.url;\r\n                    }\r\n\r\n                    if (negotiateResponse.accessToken) {\r\n                        // Replace the current access token factory with one that uses\r\n                        // the returned access token\r\n                        const accessToken = negotiateResponse.accessToken;\r\n                        this.accessTokenFactory = () => accessToken;\r\n                    }\r\n\r\n                    redirects++;\r\n                }\r\n                while (negotiateResponse.url && redirects < MAX_REDIRECTS);\r\n\r\n                if (redirects === MAX_REDIRECTS && negotiateResponse.url) {\r\n                    throw Error(\"Negotiate redirection limit exceeded.\");\r\n                }\r\n\r\n                await this.createTransport(url, this.options.transport, negotiateResponse, transferFormat);\r\n            }\r\n\r\n            if (this.transport instanceof LongPollingTransport) {\r\n                this.features.inherentKeepAlive = true;\r\n            }\r\n\r\n            this.transport!.onreceive = this.onreceive;\r\n            this.transport!.onclose = (e) => this.stopConnection(e);\r\n\r\n            // only change the state if we were connecting to not overwrite\r\n            // the state if the connection is already marked as Disconnected\r\n            this.changeState(ConnectionState.Connecting, ConnectionState.Connected);\r\n        } catch (e) {\r\n            this.logger.log(LogLevel.Error, \"Failed to start the connection: \" + e);\r\n            this.connectionState = ConnectionState.Disconnected;\r\n            this.transport = undefined;\r\n            throw e;\r\n        }\r\n    }\r\n\r\n    private async getNegotiationResponse(url: string): Promise<INegotiateResponse> {\r\n        let headers;\r\n        if (this.accessTokenFactory) {\r\n            const token = await this.accessTokenFactory();\r\n            if (token) {\r\n                headers = {\r\n                    [\"Authorization\"]: `Bearer ${token}`,\r\n                };\r\n            }\r\n        }\r\n\r\n        const negotiateUrl = this.resolveNegotiateUrl(url);\r\n        this.logger.log(LogLevel.Debug, `Sending negotiation request: ${negotiateUrl}.`);\r\n        try {\r\n            const response = await this.httpClient.post(negotiateUrl, {\r\n                content: \"\",\r\n                headers,\r\n            });\r\n\r\n            if (response.statusCode !== 200) {\r\n                throw Error(`Unexpected status code returned from negotiate ${response.statusCode}`);\r\n            }\r\n\r\n            return JSON.parse(response.content as string) as INegotiateResponse;\r\n        } catch (e) {\r\n            this.logger.log(LogLevel.Error, \"Failed to complete negotiation with the server: \" + e);\r\n            throw e;\r\n        }\r\n    }\r\n\r\n    private createConnectUrl(url: string, connectionId: string | null | undefined) {\r\n        if (!connectionId) {\r\n            return url;\r\n        }\r\n        return url + (url.indexOf(\"?\") === -1 ? \"?\" : \"&\") + `id=${connectionId}`;\r\n    }\r\n\r\n    private async createTransport(url: string, requestedTransport: HttpTransportType | ITransport | undefined, negotiateResponse: INegotiateResponse, requestedTransferFormat: TransferFormat): Promise<void> {\r\n        let connectUrl = this.createConnectUrl(url, negotiateResponse.connectionId);\r\n        if (this.isITransport(requestedTransport)) {\r\n            this.logger.log(LogLevel.Debug, \"Connection was provided an instance of ITransport, using that directly.\");\r\n            this.transport = requestedTransport;\r\n            await this.transport.connect(connectUrl, requestedTransferFormat);\r\n\r\n            // only change the state if we were connecting to not overwrite\r\n            // the state if the connection is already marked as Disconnected\r\n            this.changeState(ConnectionState.Connecting, ConnectionState.Connected);\r\n            return;\r\n        }\r\n\r\n        const transports = negotiateResponse.availableTransports || [];\r\n        for (const endpoint of transports) {\r\n            this.connectionState = ConnectionState.Connecting;\r\n            const transport = this.resolveTransport(endpoint, requestedTransport, requestedTransferFormat);\r\n            if (typeof transport === \"number\") {\r\n                this.transport = this.constructTransport(transport);\r\n                if (!negotiateResponse.connectionId) {\r\n                    negotiateResponse = await this.getNegotiationResponse(url);\r\n                    connectUrl = this.createConnectUrl(url, negotiateResponse.connectionId);\r\n                }\r\n                try {\r\n                    await this.transport!.connect(connectUrl, requestedTransferFormat);\r\n                    this.changeState(ConnectionState.Connecting, ConnectionState.Connected);\r\n                    return;\r\n                } catch (ex) {\r\n                    this.logger.log(LogLevel.Error, `Failed to start the transport '${HttpTransportType[transport]}': ${ex}`);\r\n                    this.connectionState = ConnectionState.Disconnected;\r\n                    negotiateResponse.connectionId = undefined;\r\n                }\r\n            }\r\n        }\r\n\r\n        throw new Error(\"Unable to initialize any of the available transports.\");\r\n    }\r\n\r\n    private constructTransport(transport: HttpTransportType) {\r\n        switch (transport) {\r\n            case HttpTransportType.WebSockets:\r\n                if (!this.options.WebSocket) {\r\n                    throw new Error(\"'WebSocket' is not supported in your environment.\");\r\n                }\r\n                return new WebSocketTransport(this.httpClient, this.accessTokenFactory, this.logger, this.options.logMessageContent || false, this.options.WebSocket);\r\n            case HttpTransportType.ServerSentEvents:\r\n                if (!this.options.EventSource) {\r\n                    throw new Error(\"'EventSource' is not supported in your environment.\");\r\n                }\r\n                return new ServerSentEventsTransport(this.httpClient, this.accessTokenFactory, this.logger, this.options.logMessageContent || false, this.options.EventSource);\r\n            case HttpTransportType.LongPolling:\r\n                return new LongPollingTransport(this.httpClient, this.accessTokenFactory, this.logger, this.options.logMessageContent || false);\r\n            default:\r\n                throw new Error(`Unknown transport: ${transport}.`);\r\n        }\r\n    }\r\n\r\n    private resolveTransport(endpoint: IAvailableTransport, requestedTransport: HttpTransportType | undefined, requestedTransferFormat: TransferFormat): HttpTransportType | null {\r\n        const transport = HttpTransportType[endpoint.transport];\r\n        if (transport === null || transport === undefined) {\r\n            this.logger.log(LogLevel.Debug, `Skipping transport '${endpoint.transport}' because it is not supported by this client.`);\r\n        } else {\r\n            const transferFormats = endpoint.transferFormats.map((s) => TransferFormat[s]);\r\n            if (transportMatches(requestedTransport, transport)) {\r\n                if (transferFormats.indexOf(requestedTransferFormat) >= 0) {\r\n                    if ((transport === HttpTransportType.WebSockets && !this.options.WebSocket) ||\r\n                        (transport === HttpTransportType.ServerSentEvents && !this.options.EventSource)) {\r\n                        this.logger.log(LogLevel.Debug, `Skipping transport '${HttpTransportType[transport]}' because it is not supported in your environment.'`);\r\n                    } else {\r\n                        this.logger.log(LogLevel.Debug, `Selecting transport '${HttpTransportType[transport]}'.`);\r\n                        return transport;\r\n                    }\r\n                } else {\r\n                    this.logger.log(LogLevel.Debug, `Skipping transport '${HttpTransportType[transport]}' because it does not support the requested transfer format '${TransferFormat[requestedTransferFormat]}'.`);\r\n                }\r\n            } else {\r\n                this.logger.log(LogLevel.Debug, `Skipping transport '${HttpTransportType[transport]}' because it was disabled by the client.`);\r\n            }\r\n        }\r\n        return null;\r\n    }\r\n\r\n    private isITransport(transport: any): transport is ITransport {\r\n        return transport && typeof (transport) === \"object\" && \"connect\" in transport;\r\n    }\r\n\r\n    private changeState(from: ConnectionState, to: ConnectionState): boolean {\r\n        if (this.connectionState === from) {\r\n            this.connectionState = to;\r\n            return true;\r\n        }\r\n        return false;\r\n    }\r\n\r\n    private stopConnection(error?: Error): void {\r\n        this.transport = undefined;\r\n\r\n        // If we have a stopError, it takes precedence over the error from the transport\r\n        error = this.stopError || error;\r\n\r\n        if (error) {\r\n            this.logger.log(LogLevel.Error, `Connection disconnected with error '${error}'.`);\r\n        } else {\r\n            this.logger.log(LogLevel.Information, \"Connection disconnected.\");\r\n        }\r\n\r\n        this.connectionState = ConnectionState.Disconnected;\r\n\r\n        if (this.onclose) {\r\n            this.onclose(error);\r\n        }\r\n    }\r\n\r\n    private resolveUrl(url: string): string {\r\n        // startsWith is not supported in IE\r\n        if (url.lastIndexOf(\"https://\", 0) === 0 || url.lastIndexOf(\"http://\", 0) === 0) {\r\n            return url;\r\n        }\r\n\r\n        if (typeof window === \"undefined\" || !window || !window.document) {\r\n            throw new Error(`Cannot resolve '${url}'.`);\r\n        }\r\n\r\n        // Setting the url to the href propery of an anchor tag handles normalization\r\n        // for us. There are 3 main cases.\r\n        // 1. Relative  path normalization e.g \"b\" -> \"http://localhost:5000/a/b\"\r\n        // 2. Absolute path normalization e.g \"/a/b\" -> \"http://localhost:5000/a/b\"\r\n        // 3. Networkpath reference normalization e.g \"//localhost:5000/a/b\" -> \"http://localhost:5000/a/b\"\r\n        const aTag = window.document.createElement(\"a\");\r\n        aTag.href = url;\r\n\r\n        this.logger.log(LogLevel.Information, `Normalizing '${url}' to '${aTag.href}'.`);\r\n        return aTag.href;\r\n    }\r\n\r\n    private resolveNegotiateUrl(url: string): string {\r\n        const index = url.indexOf(\"?\");\r\n        let negotiateUrl = url.substring(0, index === -1 ? url.length : index);\r\n        if (negotiateUrl[negotiateUrl.length - 1] !== \"/\") {\r\n            negotiateUrl += \"/\";\r\n        }\r\n        negotiateUrl += \"negotiate\";\r\n        negotiateUrl += index === -1 ? \"\" : url.substring(index);\r\n        return negotiateUrl;\r\n    }\r\n}\r\n\r\nfunction transportMatches(requestedTransport: HttpTransportType | undefined, actualTransport: HttpTransportType) {\r\n    return !requestedTransport || ((actualTransport & requestedTransport) !== 0);\r\n}\r\n"]}