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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 { HttpClient } from \"./HttpClient\";\r\nimport { ILogger, LogLevel } from \"./ILogger\";\r\nimport { ITransport, TransferFormat } from \"./ITransport\";\r\nimport { Arg, getDataDetail, sendMessage } from \"./Utils\";\r\n\r\n/** @private */\r\nexport class ServerSentEventsTransport implements ITransport {\r\n    private readonly httpClient: HttpClient;\r\n    private readonly accessTokenFactory: () => string | Promise<string>;\r\n    private readonly logger: ILogger;\r\n    private readonly logMessageContent: boolean;\r\n    private eventSource: EventSource;\r\n    private url: string;\r\n\r\n    constructor(httpClient: HttpClient, accessTokenFactory: () => string | Promise<string>, logger: ILogger, logMessageContent: boolean) {\r\n        this.httpClient = httpClient;\r\n        this.accessTokenFactory = accessTokenFactory || (() => null);\r\n        this.logger = logger;\r\n        this.logMessageContent = logMessageContent;\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        if (typeof (EventSource) === \"undefined\") {\r\n            throw new Error(\"'EventSource' is not supported in your environment.\");\r\n        }\r\n\r\n        this.logger.log(LogLevel.Trace, \"(SSE transport) Connecting\");\r\n\r\n        const token = await this.accessTokenFactory();\r\n        if (token) {\r\n            url += (url.indexOf(\"?\") < 0 ? \"?\" : \"&\") + `access_token=${encodeURIComponent(token)}`;\r\n        }\r\n\r\n        this.url = url;\r\n        return new Promise<void>((resolve, reject) => {\r\n            let opened = false;\r\n            if (transferFormat !== TransferFormat.Text) {\r\n                reject(new Error(\"The Server-Sent Events transport only supports the 'Text' transfer format\"));\r\n            }\r\n\r\n            const eventSource = new EventSource(url, { withCredentials: true });\r\n\r\n            try {\r\n                eventSource.onmessage = (e: MessageEvent) => {\r\n                    if (this.onreceive) {\r\n                        try {\r\n                            this.logger.log(LogLevel.Trace, `(SSE transport) data received. ${getDataDetail(e.data, this.logMessageContent)}.`);\r\n                            this.onreceive(e.data);\r\n                        } catch (error) {\r\n                            if (this.onclose) {\r\n                                this.onclose(error);\r\n                            }\r\n                            return;\r\n                        }\r\n                    }\r\n                };\r\n\r\n                eventSource.onerror = (e: any) => {\r\n                    const error = new Error(e.message || \"Error occurred\");\r\n                    if (opened) {\r\n                        this.close(error);\r\n                    } else {\r\n                        reject(error);\r\n                    }\r\n                };\r\n\r\n                eventSource.onopen = () => {\r\n                    this.logger.log(LogLevel.Information, `SSE connected to ${this.url}`);\r\n                    this.eventSource = eventSource;\r\n                    opened = true;\r\n                    resolve();\r\n                };\r\n            } catch (e) {\r\n                return Promise.reject(e);\r\n            }\r\n        });\r\n    }\r\n\r\n    public async send(data: any): Promise<void> {\r\n        if (!this.eventSource) {\r\n            return Promise.reject(new Error(\"Cannot send until the transport is connected\"));\r\n        }\r\n        return sendMessage(this.logger, \"SSE\", this.httpClient, this.url, this.accessTokenFactory, data, this.logMessageContent);\r\n    }\r\n\r\n    public stop(): Promise<void> {\r\n        this.close();\r\n        return Promise.resolve();\r\n    }\r\n\r\n    private close(e?: Error) {\r\n        if (this.eventSource) {\r\n            this.eventSource.close();\r\n            this.eventSource = null;\r\n\r\n            if (this.onclose) {\r\n                this.onclose(e);\r\n            }\r\n        }\r\n    }\r\n\r\n    public onreceive: (data: string | ArrayBuffer) => void;\r\n    public onclose: (error?: Error) => void;\r\n}\r\n"]}