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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 { AbortController } from \"./AbortController\";\r\nimport { HttpError, TimeoutError } from \"./Errors\";\r\nimport { HttpClient, HttpRequest } from \"./HttpClient\";\r\nimport { MessageHeaders } from \"./IHubProtocol\";\r\nimport { ILogger, LogLevel } from \"./ILogger\";\r\nimport { ITransport, TransferFormat } from \"./ITransport\";\r\nimport { Arg, getDataDetail, getUserAgentHeader, sendMessage } from \"./Utils\";\r\n\r\n// Not exported from 'index', this type is internal.\r\n/** @private */\r\nexport class LongPollingTransport implements ITransport {\r\n    private readonly httpClient: HttpClient;\r\n    private readonly accessTokenFactory: (() => string | Promise<string>) | undefined;\r\n    private readonly logger: ILogger;\r\n    private readonly logMessageContent: boolean;\r\n    private readonly withCredentials: boolean;\r\n    private readonly pollAbort: AbortController;\r\n    private readonly headers: MessageHeaders;\r\n\r\n    private url?: string;\r\n    private running: boolean;\r\n    private receiving?: Promise<void>;\r\n    private closeError?: Error;\r\n\r\n    public onreceive: ((data: string | ArrayBuffer) => void) | null;\r\n    public onclose: ((error?: Error) => void) | null;\r\n\r\n    // This is an internal type, not exported from 'index' so this is really just internal.\r\n    public get pollAborted() {\r\n        return this.pollAbort.aborted;\r\n    }\r\n\r\n    constructor(httpClient: HttpClient, accessTokenFactory: (() => string | Promise<string>) | undefined, logger: ILogger, logMessageContent: boolean, withCredentials: boolean, headers: MessageHeaders) {\r\n        this.httpClient = httpClient;\r\n        this.accessTokenFactory = accessTokenFactory;\r\n        this.logger = logger;\r\n        this.pollAbort = new AbortController();\r\n        this.logMessageContent = logMessageContent;\r\n        this.withCredentials = withCredentials;\r\n        this.headers = headers;\r\n\r\n        this.running = false;\r\n\r\n        this.onreceive = null;\r\n        this.onclose = null;\r\n    }\r\n\r\n    public async connect(url: string, transferFormat: TransferFormat): Promise<void> {\r\n        Arg.isRequired(url, \"url\");\r\n        Arg.isRequired(transferFormat, \"transferFormat\");\r\n        Arg.isIn(transferFormat, TransferFormat, \"transferFormat\");\r\n\r\n        this.url = url;\r\n\r\n        this.logger.log(LogLevel.Trace, \"(LongPolling transport) Connecting.\");\r\n\r\n        // Allow binary format on Node and Browsers that support binary content (indicated by the presence of responseType property)\r\n        if (transferFormat === TransferFormat.Binary &&\r\n            (typeof XMLHttpRequest !== \"undefined\" && typeof new XMLHttpRequest().responseType !== \"string\")) {\r\n            throw new Error(\"Binary protocols over XmlHttpRequest not implementing advanced features are not supported.\");\r\n        }\r\n\r\n        const [name, value] = getUserAgentHeader();\r\n        const headers = { [name]: value, ...this.headers };\r\n\r\n        const pollOptions: HttpRequest = {\r\n            abortSignal: this.pollAbort.signal,\r\n            headers,\r\n            timeout: 100000,\r\n            withCredentials: this.withCredentials,\r\n        };\r\n\r\n        if (transferFormat === TransferFormat.Binary) {\r\n            pollOptions.responseType = \"arraybuffer\";\r\n        }\r\n\r\n        const token = await this.getAccessToken();\r\n        this.updateHeaderToken(pollOptions, token);\r\n\r\n        // Make initial long polling request\r\n        // Server uses first long polling request to finish initializing connection and it returns without data\r\n        const pollUrl = `${url}&_=${Date.now()}`;\r\n        this.logger.log(LogLevel.Trace, `(LongPolling transport) polling: ${pollUrl}.`);\r\n        const response = await this.httpClient.get(pollUrl, pollOptions);\r\n        if (response.statusCode !== 200) {\r\n            this.logger.log(LogLevel.Error, `(LongPolling transport) Unexpected response code: ${response.statusCode}.`);\r\n\r\n            // Mark running as false so that the poll immediately ends and runs the close logic\r\n            this.closeError = new HttpError(response.statusText || \"\", response.statusCode);\r\n            this.running = false;\r\n        } else {\r\n            this.running = true;\r\n        }\r\n\r\n        this.receiving = this.poll(this.url, pollOptions);\r\n    }\r\n\r\n    private async getAccessToken(): Promise<string | null> {\r\n        if (this.accessTokenFactory) {\r\n            return await this.accessTokenFactory();\r\n        }\r\n\r\n        return null;\r\n    }\r\n\r\n    private updateHeaderToken(request: HttpRequest, token: string | null) {\r\n        if (!request.headers) {\r\n            request.headers = {};\r\n        }\r\n        if (token) {\r\n            // tslint:disable-next-line:no-string-literal\r\n            request.headers[\"Authorization\"] = `Bearer ${token}`;\r\n            return;\r\n        }\r\n        // tslint:disable-next-line:no-string-literal\r\n        if (request.headers[\"Authorization\"]) {\r\n            // tslint:disable-next-line:no-string-literal\r\n            delete request.headers[\"Authorization\"];\r\n        }\r\n    }\r\n\r\n    private async poll(url: string, pollOptions: HttpRequest): Promise<void> {\r\n        try {\r\n            while (this.running) {\r\n                // We have to get the access token on each poll, in case it changes\r\n                const token = await this.getAccessToken();\r\n                this.updateHeaderToken(pollOptions, token);\r\n\r\n                try {\r\n                    const pollUrl = `${url}&_=${Date.now()}`;\r\n                    this.logger.log(LogLevel.Trace, `(LongPolling transport) polling: ${pollUrl}.`);\r\n                    const response = await this.httpClient.get(pollUrl, pollOptions);\r\n\r\n                    if (response.statusCode === 204) {\r\n                        this.logger.log(LogLevel.Information, \"(LongPolling transport) Poll terminated by server.\");\r\n\r\n                        this.running = false;\r\n                    } else if (response.statusCode !== 200) {\r\n                        this.logger.log(LogLevel.Error, `(LongPolling transport) Unexpected response code: ${response.statusCode}.`);\r\n\r\n                        // Unexpected status code\r\n                        this.closeError = new HttpError(response.statusText || \"\", response.statusCode);\r\n                        this.running = false;\r\n                    } else {\r\n                        // Process the response\r\n                        if (response.content) {\r\n                            this.logger.log(LogLevel.Trace, `(LongPolling transport) data received. ${getDataDetail(response.content, this.logMessageContent)}.`);\r\n                            if (this.onreceive) {\r\n                                this.onreceive(response.content);\r\n                            }\r\n                        } else {\r\n                            // This is another way timeout manifest.\r\n                            this.logger.log(LogLevel.Trace, \"(LongPolling transport) Poll timed out, reissuing.\");\r\n                        }\r\n                    }\r\n                } catch (e) {\r\n                    if (!this.running) {\r\n                        // Log but disregard errors that occur after stopping\r\n                        this.logger.log(LogLevel.Trace, `(LongPolling transport) Poll errored after shutdown: ${e.message}`);\r\n                    } else {\r\n                        if (e instanceof TimeoutError) {\r\n                            // Ignore timeouts and reissue the poll.\r\n                            this.logger.log(LogLevel.Trace, \"(LongPolling transport) Poll timed out, reissuing.\");\r\n                        } else {\r\n                            // Close the connection with the error as the result.\r\n                            this.closeError = e;\r\n                            this.running = false;\r\n                        }\r\n                    }\r\n                }\r\n            }\r\n        } finally {\r\n            this.logger.log(LogLevel.Trace, \"(LongPolling transport) Polling complete.\");\r\n\r\n            // We will reach here with pollAborted==false when the server returned a response causing the transport to stop.\r\n            // If pollAborted==true then client initiated the stop and the stop method will raise the close event after DELETE is sent.\r\n            if (!this.pollAborted) {\r\n                this.raiseOnClose();\r\n            }\r\n        }\r\n    }\r\n\r\n    public async send(data: any): Promise<void> {\r\n        if (!this.running) {\r\n            return Promise.reject(new Error(\"Cannot send until the transport is connected\"));\r\n        }\r\n        return sendMessage(this.logger, \"LongPolling\", this.httpClient, this.url!, this.accessTokenFactory, data, this.logMessageContent, this.withCredentials, this.headers);\r\n    }\r\n\r\n    public async stop(): Promise<void> {\r\n        this.logger.log(LogLevel.Trace, \"(LongPolling transport) Stopping polling.\");\r\n\r\n        // Tell receiving loop to stop, abort any current request, and then wait for it to finish\r\n        this.running = false;\r\n        this.pollAbort.abort();\r\n\r\n        try {\r\n            await this.receiving;\r\n\r\n            // Send DELETE to clean up long polling on the server\r\n            this.logger.log(LogLevel.Trace, `(LongPolling transport) sending DELETE request to ${this.url}.`);\r\n\r\n            const headers = {};\r\n            const [name, value] = getUserAgentHeader();\r\n            headers[name] = value;\r\n\r\n            const deleteOptions: HttpRequest = {\r\n                headers: { ...headers, ...this.headers },\r\n                withCredentials: this.withCredentials,\r\n            };\r\n            const token = await this.getAccessToken();\r\n            this.updateHeaderToken(deleteOptions, token);\r\n            await this.httpClient.delete(this.url!, deleteOptions);\r\n\r\n            this.logger.log(LogLevel.Trace, \"(LongPolling transport) DELETE request sent.\");\r\n        } finally {\r\n            this.logger.log(LogLevel.Trace, \"(LongPolling transport) Stop finished.\");\r\n\r\n            // Raise close event here instead of in polling\r\n            // It needs to happen after the DELETE request is sent\r\n            this.raiseOnClose();\r\n        }\r\n    }\r\n\r\n    private raiseOnClose() {\r\n        if (this.onclose) {\r\n            let logMessage = \"(LongPolling transport) Firing onclose event.\";\r\n            if (this.closeError) {\r\n                logMessage += \" Error: \" + this.closeError;\r\n            }\r\n            this.logger.log(LogLevel.Trace, logMessage);\r\n            this.onclose(this.closeError);\r\n        }\r\n    }\r\n}\r\n"]}