/*! @azure/msal-node v3.8.1 2025-10-29 */
'use strict';
import { HttpStatus } from '@azure/msal-common/node';
import { ProxyStatus, Constants, HttpMethod } from '../utils/Constants.mjs';
import { NetworkUtils } from '../utils/NetworkUtils.mjs';
import http from 'http';
import https from 'https';

/*
 * Copyright (c) Microsoft Corporation. All rights reserved.
 * Licensed under the MIT License.
 */
/**
 * This class implements the API for network requests.
 */
class HttpClient {
    constructor(proxyUrl, customAgentOptions) {
        this.proxyUrl = proxyUrl || "";
        this.customAgentOptions = customAgentOptions || {};
    }
    /**
     * Http Get request
     * @param url
     * @param options
     */
    async sendGetRequestAsync(url, options, timeout) {
        if (this.proxyUrl) {
            return networkRequestViaProxy(url, this.proxyUrl, HttpMethod.GET, options, this.customAgentOptions, timeout);
        }
        else {
            return networkRequestViaHttps(url, HttpMethod.GET, options, this.customAgentOptions, timeout);
        }
    }
    /**
     * Http Post request
     * @param url
     * @param options
     */
    async sendPostRequestAsync(url, options) {
        if (this.proxyUrl) {
            return networkRequestViaProxy(url, this.proxyUrl, HttpMethod.POST, options, this.customAgentOptions);
        }
        else {
            return networkRequestViaHttps(url, HttpMethod.POST, options, this.customAgentOptions);
        }
    }
}
const networkRequestViaProxy = (destinationUrlString, proxyUrlString, httpMethod, options, agentOptions, timeout) => {
    const destinationUrl = new URL(destinationUrlString);
    const proxyUrl = new URL(proxyUrlString);
    // "method: connect" must be used to establish a connection to the proxy
    const headers = options?.headers || {};
    const tunnelRequestOptions = {
        host: proxyUrl.hostname,
        port: proxyUrl.port,
        method: "CONNECT",
        path: destinationUrl.hostname,
        headers: headers,
    };
    if (agentOptions && Object.keys(agentOptions).length) {
        tunnelRequestOptions.agent = new http.Agent(agentOptions);
    }
    // compose a request string for the socket
    let postRequestStringContent = "";
    if (httpMethod === HttpMethod.POST) {
        const body = options?.body || "";
        postRequestStringContent =
            "Content-Type: application/x-www-form-urlencoded\r\n" +
                `Content-Length: ${body.length}\r\n` +
                `\r\n${body}`;
    }
    else {
        // optional timeout is only for get requests (regionDiscovery, for example)
        if (timeout) {
            tunnelRequestOptions.timeout = timeout;
        }
    }
    const outgoingRequestString = `${httpMethod.toUpperCase()} ${destinationUrl.href} HTTP/1.1\r\n` +
        `Host: ${destinationUrl.host}\r\n` +
        "Connection: close\r\n" +
        postRequestStringContent +
        "\r\n";
    return new Promise((resolve, reject) => {
        const request = http.request(tunnelRequestOptions);
        if (timeout) {
            request.on("timeout", () => {
                request.destroy();
                reject(new Error("Request time out"));
            });
        }
        request.end();
        // establish connection to the proxy
        request.on("connect", (response, socket) => {
            const proxyStatusCode = response?.statusCode || ProxyStatus.SERVER_ERROR;
            if (proxyStatusCode < ProxyStatus.SUCCESS_RANGE_START ||
                proxyStatusCode > ProxyStatus.SUCCESS_RANGE_END) {
                request.destroy();
                socket.destroy();
                reject(new Error(`Error connecting to proxy. Http status code: ${response.statusCode}. Http status message: ${response?.statusMessage || "Unknown"}`));
            }
            // make a request over an HTTP tunnel
            socket.write(outgoingRequestString);
            const data = [];
            socket.on("data", (chunk) => {
                data.push(chunk);
            });
            socket.on("end", () => {
                // combine all received buffer streams into one buffer, and then into a string
                const dataString = Buffer.concat([...data]).toString();
                // separate each line into it's own entry in an arry
                const dataStringArray = dataString.split("\r\n");
                // the first entry will contain the statusCode and statusMessage
                const httpStatusCode = parseInt(dataStringArray[0].split(" ")[1]);
                // remove "HTTP/1.1" and the status code to get the status message
                const statusMessage = dataStringArray[0]
                    .split(" ")
                    .slice(2)
                    .join(" ");
                // the last entry will contain the body
                const body = dataStringArray[dataStringArray.length - 1];
                // everything in between the first and last entries are the headers
                const headersArray = dataStringArray.slice(1, dataStringArray.length - 2);
                // build an object out of all the headers
                const entries = new Map();
                headersArray.forEach((header) => {
                    /**
                     * the header might look like "Content-Length: 1531", but that is just a string
                     * it needs to be converted to a key/value pair
                     * split the string at the first instance of ":"
                     * there may be more than one ":" if the value of the header is supposed to be a JSON object
                     */
                    const headerKeyValue = header.split(new RegExp(/:\s(.*)/s));
                    const headerKey = headerKeyValue[0];
                    let headerValue = headerKeyValue[1];
                    // check if the value of the header is supposed to be a JSON object
                    try {
                        const object = JSON.parse(headerValue);
                        // if it is, then convert it from a string to a JSON object
                        if (object && typeof object === "object") {
                            headerValue = object;
                        }
                    }
                    catch (e) {
                        // otherwise, leave it as a string
                    }
                    entries.set(headerKey, headerValue);
                });
                const headers = Object.fromEntries(entries);
                const parsedHeaders = headers;
                const networkResponse = NetworkUtils.getNetworkResponse(parsedHeaders, parseBody(httpStatusCode, statusMessage, parsedHeaders, body), httpStatusCode);
                if ((httpStatusCode < HttpStatus.SUCCESS_RANGE_START ||
                    httpStatusCode > HttpStatus.SUCCESS_RANGE_END) &&
                    // do not destroy the request for the device code flow
                    networkResponse.body["error"] !==
                        Constants.AUTHORIZATION_PENDING) {
                    request.destroy();
                }
                resolve(networkResponse);
            });
            socket.on("error", (chunk) => {
                request.destroy();
                socket.destroy();
                reject(new Error(chunk.toString()));
            });
        });
        request.on("error", (chunk) => {
            request.destroy();
            reject(new Error(chunk.toString()));
        });
    });
};
const networkRequestViaHttps = (urlString, httpMethod, options, agentOptions, timeout) => {
    const isPostRequest = httpMethod === HttpMethod.POST;
    const body = options?.body || "";
    const url = new URL(urlString);
    const headers = options?.headers || {};
    const customOptions = {
        method: httpMethod,
        headers: headers,
        ...NetworkUtils.urlToHttpOptions(url),
    };
    if (agentOptions && Object.keys(agentOptions).length) {
        customOptions.agent = new https.Agent(agentOptions);
    }
    if (isPostRequest) {
        // needed for post request to work
        customOptions.headers = {
            ...customOptions.headers,
            "Content-Length": body.length,
        };
    }
    else {
        // optional timeout is only for get requests (regionDiscovery, for example)
        if (timeout) {
            customOptions.timeout = timeout;
        }
    }
    return new Promise((resolve, reject) => {
        let request;
        // managed identity sources use http instead of https
        if (customOptions.protocol === "http:") {
            request = http.request(customOptions);
        }
        else {
            request = https.request(customOptions);
        }
        if (isPostRequest) {
            request.write(body);
        }
        if (timeout) {
            request.on("timeout", () => {
                request.destroy();
                reject(new Error("Request time out"));
            });
        }
        request.end();
        request.on("response", (response) => {
            const headers = response.headers;
            const statusCode = response.statusCode;
            const statusMessage = response.statusMessage;
            const data = [];
            response.on("data", (chunk) => {
                data.push(chunk);
            });
            response.on("end", () => {
                // combine all received buffer streams into one buffer, and then into a string
                const body = Buffer.concat([...data]).toString();
                const parsedHeaders = headers;
                const networkResponse = NetworkUtils.getNetworkResponse(parsedHeaders, parseBody(statusCode, statusMessage, parsedHeaders, body), statusCode);
                if ((statusCode < HttpStatus.SUCCESS_RANGE_START ||
                    statusCode > HttpStatus.SUCCESS_RANGE_END) &&
                    // do not destroy the request for the device code flow
                    networkResponse.body["error"] !==
                        Constants.AUTHORIZATION_PENDING) {
                    request.destroy();
                }
                resolve(networkResponse);
            });
        });
        request.on("error", (chunk) => {
            request.destroy();
            reject(new Error(chunk.toString()));
        });
    });
};
/**
 * Check if extra parsing is needed on the repsonse from the server
 * @param statusCode {number} the status code of the response from the server
 * @param statusMessage {string | undefined} the status message of the response from the server
 * @param headers {Record<string, string>} the headers of the response from the server
 * @param body {string} the body from the response of the server
 * @returns {Object} JSON parsed body or error object
 */
const parseBody = (statusCode, statusMessage, headers, body) => {
    /*
     * Informational responses (100 – 199)
     * Successful responses (200 – 299)
     * Redirection messages (300 – 399)
     * Client error responses (400 – 499)
     * Server error responses (500 – 599)
     */
    let parsedBody;
    try {
        parsedBody = JSON.parse(body);
    }
    catch (error) {
        let errorType;
        let errorDescriptionHelper;
        if (statusCode >= HttpStatus.CLIENT_ERROR_RANGE_START &&
            statusCode <= HttpStatus.CLIENT_ERROR_RANGE_END) {
            errorType = "client_error";
            errorDescriptionHelper = "A client";
        }
        else if (statusCode >= HttpStatus.SERVER_ERROR_RANGE_START &&
            statusCode <= HttpStatus.SERVER_ERROR_RANGE_END) {
            errorType = "server_error";
            errorDescriptionHelper = "A server";
        }
        else {
            errorType = "unknown_error";
            errorDescriptionHelper = "An unknown";
        }
        parsedBody = {
            error: errorType,
            error_description: `${errorDescriptionHelper} error occured.\nHttp status code: ${statusCode}\nHttp status message: ${statusMessage || "Unknown"}\nHeaders: ${JSON.stringify(headers)}`,
        };
    }
    return parsedBody;
};

export { HttpClient };
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