"use strict";
var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
    if (k2 === undefined) k2 = k;
    var desc = Object.getOwnPropertyDescriptor(m, k);
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      desc = { enumerable: true, get: function() { return m[k]; } };
    }
    Object.defineProperty(o, k2, desc);
}) : (function(o, m, k, k2) {
    if (k2 === undefined) k2 = k;
    o[k2] = m[k];
}));
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    Object.defineProperty(o, "default", { enumerable: true, value: v });
}) : function(o, v) {
    o["default"] = v;
});
var __importStar = (this && this.__importStar) || (function () {
    var ownKeys = function(o) {
        ownKeys = Object.getOwnPropertyNames || function (o) {
            var ar = [];
            for (var k in o) if (Object.prototype.hasOwnProperty.call(o, k)) ar[ar.length] = k;
            return ar;
        };
        return ownKeys(o);
    };
    return function (mod) {
        if (mod && mod.__esModule) return mod;
        var result = {};
        if (mod != null) for (var k = ownKeys(mod), i = 0; i < k.length; i++) if (k[i] !== "default") __createBinding(result, mod, k[i]);
        __setModuleDefault(result, mod);
        return result;
    };
})();
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
    function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
    return new (P || (P = Promise))(function (resolve, reject) {
        function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
        function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
        function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
        step((generator = generator.apply(thisArg, _arguments || [])).next());
    });
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.UpdateProvider = void 0;
const logger_1 = require("@coder/logger");
const http = __importStar(require("http"));
const https = __importStar(require("https"));
const proxy_agent_1 = require("proxy-agent");
const semver = __importStar(require("semver"));
const url = __importStar(require("url"));
const constants_1 = require("./constants");
/**
 * Provide update information.
 */
class UpdateProvider {
    constructor(
    /**
     * The URL for getting the latest version of code-server. Should return JSON
     * that fulfills `LatestResponse`.
     */
    latestUrl, 
    /**
     * Update information will be stored here.
     */
    settings) {
        this.latestUrl = latestUrl;
        this.settings = settings;
        this.updateInterval = 1000 * 60 * 60 * 24; // Milliseconds between update checks.
    }
    /**
     * Query for and return the latest update.
     */
    getUpdate(force) {
        return __awaiter(this, void 0, void 0, function* () {
            // Don't run multiple requests at a time.
            if (!this.update) {
                this.update = this._getUpdate(force);
                this.update.then(() => (this.update = undefined));
            }
            return this.update;
        });
    }
    _getUpdate(force) {
        return __awaiter(this, void 0, void 0, function* () {
            const now = Date.now();
            try {
                let { update } = !force ? yield this.settings.read() : { update: undefined };
                if (!update || update.checked + this.updateInterval < now) {
                    const buffer = yield this.request(this.latestUrl);
                    const data = JSON.parse(buffer.toString());
                    update = { checked: now, version: data.name.replace(/^v/, "") };
                    yield this.settings.write({ update });
                }
                logger_1.logger.debug("got latest version", (0, logger_1.field)("latest", update.version));
                return update;
            }
            catch (error) {
                logger_1.logger.error("Failed to get latest version", (0, logger_1.field)("error", error.message));
                return {
                    checked: now,
                    version: "unknown",
                };
            }
        });
    }
    /**
     * Return true if the currently installed version is the latest.
     */
    isLatestVersion(latest) {
        logger_1.logger.debug("comparing versions", (0, logger_1.field)("current", constants_1.version), (0, logger_1.field)("latest", latest.version));
        try {
            return semver.lte(latest.version, constants_1.version);
        }
        catch (error) {
            return true;
        }
    }
    request(uri) {
        return __awaiter(this, void 0, void 0, function* () {
            const response = yield this.requestResponse(uri);
            return new Promise((resolve, reject) => {
                const chunks = [];
                let bufferLength = 0;
                response.on("data", (chunk) => {
                    bufferLength += chunk.length;
                    chunks.push(chunk);
                });
                response.on("error", reject);
                response.on("end", () => {
                    resolve(Buffer.concat(chunks, bufferLength));
                });
            });
        });
    }
    requestResponse(uri) {
        return __awaiter(this, void 0, void 0, function* () {
            let redirects = 0;
            const maxRedirects = 10;
            return new Promise((resolve, reject) => {
                const request = (uri) => {
                    logger_1.logger.debug("Making request", (0, logger_1.field)("uri", uri));
                    const isHttps = uri.startsWith("https");
                    const agent = new proxy_agent_1.ProxyAgent({
                        keepAlive: true,
                        getProxyForUrl: () => constants_1.httpProxyUri || "",
                    });
                    const httpx = isHttps ? https : http;
                    const client = httpx.get(uri, { headers: { "User-Agent": "code-server" }, agent }, (response) => {
                        if (!response.statusCode || response.statusCode < 200 || response.statusCode >= 400) {
                            response.destroy();
                            return reject(new Error(`${uri}: ${response.statusCode || "500"}`));
                        }
                        if (response.statusCode >= 300) {
                            response.destroy();
                            ++redirects;
                            if (redirects > maxRedirects) {
                                return reject(new Error("reached max redirects"));
                            }
                            if (!response.headers.location) {
                                return reject(new Error("received redirect with no location header"));
                            }
                            return request(url.resolve(uri, response.headers.location));
                        }
                        resolve(response);
                    });
                    client.on("error", reject);
                };
                request(uri);
            });
        });
    }
}
exports.UpdateProvider = UpdateProvider;
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