oc-codex-multi-auth/lib/auth/server.ts at c24bfae53b06854cd97bf4b9a6a9f5c8da000c8e · ndycode/oc-codex-multi-auth · GitHub

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import http from "node:http";
import fs from "node:fs";
import path from "node:path";
import { fileURLToPath } from "node:url";
import type { OAuthServerInfo } from "../types.js";
import { logError, logWarn } from "../logger.js";

// Resolve path to oauth-success.html (one level up from auth/ subfolder)
const __dirname = path.dirname(fileURLToPath(import.meta.url));
const SUCCESS_HTML_PATH = path.join(__dirname, "..", "oauth-success.html");
const FALLBACK_SUCCESS_HTML = `<!doctype html>
<html>
  <head>
    <meta charset="utf-8" />
    <title>Authorization Complete</title>
  </head>
  <body>
    <h1>Authorization complete</h1>
    <p>You can return to OpenCode.</p>
  </body>
</html>`;

function loadSuccessHtml(): string {
	try {
		return fs.readFileSync(SUCCESS_HTML_PATH, "utf-8");
	} catch (error) {
		logWarn("oauth-success.html missing; using fallback success page", {
			path: SUCCESS_HTML_PATH,
			error: (error as Error)?.message ?? String(error),
		});
		return FALLBACK_SUCCESS_HTML;
	}
}

const successHtml = loadSuccessHtml();

/**
 * Start a small local HTTP server that waits for /auth/callback and returns the code
 * @param options - OAuth state for validation
 * @returns Promise that resolves to server info
 */
export function startLocalOAuthServer({ state }: { state: string }): Promise<OAuthServerInfo> {
	let pollAborted = false;
	const server = http.createServer((req, res) => {
		try {
			const url = new URL(req.url || "", "http://localhost");
			if (url.pathname !== "/auth/callback") {
				res.statusCode = 404;
				res.end("Not found");
				return;
			}
			if (url.searchParams.get("state") !== state) {
				res.statusCode = 400;
				res.end("State mismatch");
				return;
			}
			const code = url.searchParams.get("code");
			if (!code) {
				res.statusCode = 400;
				res.end("Missing authorization code");
				return;
			}
			res.statusCode = 200;
			res.setHeader("Content-Type", "text/html; charset=utf-8");
			res.setHeader("X-Frame-Options", "DENY");
			res.setHeader("X-Content-Type-Options", "nosniff");
			res.setHeader("Content-Security-Policy", "default-src 'self'; script-src 'none'");
			res.end(successHtml);
			const codeStore = server as http.Server & { _lastCode?: string; _lastState?: string };
			codeStore._lastCode = code;
			codeStore._lastState = state;
	} catch (err) {
		logError(`Request handler error: ${(err as Error)?.message ?? String(err)}`);
		res.statusCode = 500;
		res.end("Internal error");
	}
	});

	server.unref();

	return new Promise((resolve) => {
		server
			.listen(1455, "127.0.0.1", () => {
				resolve({
					port: 1455,
					ready: true,
					close: () => {
						pollAborted = true;
						server.close();
					},
				waitForCode: async (_expectedState: string) => {
					const POLL_INTERVAL_MS = 100;
					const TIMEOUT_MS = 5 * 60 * 1000;
					const maxIterations = Math.floor(TIMEOUT_MS / POLL_INTERVAL_MS);
					const poll = () => new Promise<void>((r) => setTimeout(r, POLL_INTERVAL_MS));
					for (let i = 0; i < maxIterations; i++) {
						if (pollAborted) return null;
						const codeStore = server as http.Server & { _lastCode?: string; _lastState?: string };
						const lastCode = codeStore._lastCode;
						const lastState = codeStore._lastState;
						if (lastCode && lastState === _expectedState) return { code: lastCode };
						await poll();
					}
					logWarn("OAuth poll timeout after 5 minutes");
					return null;
				},
				});
			})
			.on("error", (err: NodeJS.ErrnoException) => {
				logError(
					`Failed to bind http://127.0.0.1:1455 (${err?.code}). Falling back to manual paste.`,
				);
				resolve({
					port: 1455,
					ready: false,
				close: () => {
					pollAborted = true;
					try {
						server.close();
					} catch (err) {
					logError(`Failed to close OAuth server: ${(err as Error)?.message ?? String(err)}`);
					}
				},
					waitForCode: () => Promise.resolve(null),
				});
			});
	});
}