Zoo-Code/src/services/mcp/utils/callbackServer.ts at 9df9ede4319a13e2cf4f284bfa96d36c6aa2d70f · Zoo-Code-Org/Zoo-Code · GitHub

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import * as http from "http"
import { t } from "../../../i18n"
import { OAUTH_FLOW_TIMEOUT_MS } from "../constants"

const HTML_RESPONSE_CONTENT_TYPE = "text/html; charset=utf-8"
const CHARSET_META_TAG = '<meta charset="utf-8">'

export interface CallbackResult {
	code?: string
	error?: string
	error_description?: string
	state?: string
}

/**
 * Starts a local HTTP server to handle OAuth callback.
 * @param port Optional port to use (defaults to random available port)
 * @param expectedState Optional expected state for CSRF protection
 * @returns Promise<{server: http.Server, port: number, result: Promise<CallbackResult>}>
 */
export function startCallbackServer(
	port?: number,
	expectedState?: string,
): Promise<{
	server: http.Server
	port: number
	result: Promise<CallbackResult>
	cancel: () => void
}> {
	// In test mode, immediately resolve with mock data
	if (process.env.MCP_OAUTH_TEST_MODE === "true") {
		return new Promise((resolve) => {
			const mockServer = http.createServer()
			resolve({
				server: mockServer,
				port: 3000,
				result: Promise.resolve({ code: "test-auth-code", state: expectedState }),
				cancel: () => {},
			})
		})
	}

	return new Promise((resolve, reject) => {
		const server = http.createServer()

		server.listen(port || 0, "127.0.0.1", () => {
			const address = server.address()
			if (!address || typeof address === "string") {
				reject(new Error("Failed to get server address"))
				return
			}

			const actualPort = address.port

			let resolveResult!: (value: CallbackResult) => void
			let rejectResult!: (reason: unknown) => void
			const resultPromise = new Promise<CallbackResult>((res, rej) => {
				resolveResult = res
				rejectResult = rej
			})

			let resolved = false

			const timeout = setTimeout(() => {
				if (!resolved) {
					resolved = true
					rejectResult(new Error("Callback timeout"))
					server.close()
				}
			}, OAUTH_FLOW_TIMEOUT_MS)

			const cancel = () => {
				if (!resolved) {
					resolved = true
					clearTimeout(timeout)
					rejectResult(new Error("Callback cancelled"))
				}
			}

			server.on("request", (req: any, res: any) => {
				if (resolved) return

				const url = new URL(req.url || "", `http://localhost:${actualPort}`)
				const pathname = url.pathname

				if (pathname === "/callback") {
					resolved = true
					clearTimeout(timeout)

					const code = url.searchParams.get("code")
					const error = url.searchParams.get("error")
					const errorDescription = url.searchParams.get("error_description")
					const state = url.searchParams.get("state")
					const hasError = !!error

					// Verify state for CSRF protection
					if (expectedState && state !== expectedState) {
						res.writeHead(400, {
							"Content-Type": HTML_RESPONSE_CONTENT_TYPE,
							"Content-Security-Policy": "default-src 'none'; style-src 'unsafe-inline'",
						})
						res.end(`
						         <!DOCTYPE html>
						         <html>
						           <head>
						             ${CHARSET_META_TAG}
						             <title>${t("mcp:oauth.callback.title")}</title>
						           </head>
						           <body>
						             <h1>${t("mcp:oauth.callback.failed")}</h1>
						             <p>${t("mcp:oauth.callback.invalid_state")}</p>
						           </body>
						         </html>
						       `)
						rejectResult(new Error("Invalid state parameter"))
						server.close()
						return
					}

					// Send HTML response
					res.writeHead(200, {
						"Content-Type": HTML_RESPONSE_CONTENT_TYPE,
						"Content-Security-Policy":
							"default-src 'none'; style-src 'unsafe-inline'; script-src 'unsafe-inline'",
					})
					res.end(`
<!DOCTYPE html>
<html>
  <head>
    ${CHARSET_META_TAG}
    <title>${t("mcp:oauth.callback.title")}</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <style>
      body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; max-width: 400px; margin: 50px auto; text-align: center; padding: 20px; }
      h1 { color: #28a745; }
      .error h1 { color: #dc3545; }
      .spinner { border: 4px solid #f3f3f3; border-top: 4px solid #28a745; border-radius: 50%; width: 40px; height: 40px; animation: spin 1s linear infinite; margin: 20px auto; }
      @keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }
      button { background: #007acc; color: white; border: none; padding: 10px 20px; border-radius: 6px; cursor: pointer; font-size: 16px; }
      .countdown { font-size: 18px; margin: 10px 0; }
    </style>
  </head>
  <body>
    <h1 id="title">${hasError ? t("mcp:oauth.callback.failed") : t("mcp:oauth.callback.success")}</h1>
    <div class="spinner" id="spinner" style="${hasError ? "display:none;" : ""}"></div>
    <p id="message">
      ${hasError ? t("mcp:oauth.callback.auth_failed") : t("mcp:oauth.callback.auth_success")}
    </p>
    <div id="countdown" class="countdown" style="${hasError ? "display:none;" : ""}">${t("mcp:oauth.callback.server_connection_complete")}</div>
    <script>
      const isError = ${hasError ? "true" : "false"};
      if (!isError) {
        let count = 5;
        const countdownEl = document.getElementById('countdown');
        if (countdownEl) {
          countdownEl.innerHTML = \`${t("mcp:oauth.callback.tab_closing_in", { count: 5 })}\`;
        }
        const timer = setInterval(() => {
          count--;
          const currentCountEl = document.getElementById('count');
          if (currentCountEl) currentCountEl.textContent = count;
          if (count <= 0) {
            clearInterval(timer);
            window.close();
            if (countdownEl) {
               countdownEl.textContent = \`${t("mcp:oauth.callback.safe_to_close")}\`;
            }
          }
        }, 1000);
      }
    </script>
  </body>
</html>
            `)

					resolveResult({
						code: code || undefined,
						error: error || undefined,
						error_description: errorDescription || undefined,
						state: state || undefined,
					})

					// Close server immediately after response drains
					res.on("finish", () => {
						server.close()
					})
				} else {
					res.writeHead(404)
					res.end("Not found")
				}
			})

			server.on("error", (error: any) => {
				if (!resolved) {
					resolved = true
					clearTimeout(timeout)
					rejectResult(error)
				}
			})

			resolve({
				server,
				port: actualPort,
				result: resultPromise,
				cancel,
			})
		})

		server.on("error", reject)
	})
}

/**
 * Stops the callback server and cancels any pending result promise so its
 * timeout doesn't fire after the provider is already closed.
 */
export function stopCallbackServer(server: http.Server, cancel: () => void): Promise<void> {
	cancel()
	return new Promise((resolve) => {
		server.close(() => resolve())
	})
}