| 1 | import type { EntryContext, RouterContextProvider, ServerInstrumentation } from "react-router"; |
| 2 | import { ServerRouter } from "react-router"; |
| 3 | import { isbot } from "isbot"; |
| 4 | import { renderToReadableStream } from "react-dom/server"; |
| 5 | |
| 6 | import { addresses } from "./lib/addresses.server"; |
| 7 | import { NonceContext } from "./lib/nonce"; |
| 8 | import { makeNonce, pagePolicy } from "./lib/page-headers"; |
| 9 | import { recordHandler } from "./lib/perf.server"; |
| 10 | |
| 11 | // React Router's own server entry, plus the timing of every loader and |
| 12 | // action for the Server-Timing header (lib/perf.server.ts). |
| 13 | |
| 14 | export const streamTimeout = 5_000; |
| 15 | |
| 16 | export const instrumentations: ServerInstrumentation[] = [ |
| 17 | { |
| 18 | route(route) { |
| 19 | route.instrument({ |
| 20 | async loader(handle) { |
| 21 | const started = Date.now(); |
| 22 | await handle(); |
| 23 | recordHandler(route.id, "loader", Date.now() - started); |
| 24 | }, |
| 25 | async action(handle) { |
| 26 | const started = Date.now(); |
| 27 | await handle(); |
| 28 | recordHandler(route.id, "action", Date.now() - started); |
| 29 | }, |
| 30 | }); |
| 31 | }, |
| 32 | }, |
| 33 | ]; |
| 34 | |
| 35 | export default async function handleRequest( |
| 36 | request: Request, |
| 37 | responseStatusCode: number, |
| 38 | responseHeaders: Headers, |
| 39 | routerContext: EntryContext, |
| 40 | _loadContext: RouterContextProvider, |
| 41 | ) { |
| 42 | // https://httpwg.org/specs/rfc9110.html#HEAD |
| 43 | if (request.method.toUpperCase() === "HEAD") { |
| 44 | return new Response(null, { |
| 45 | status: responseStatusCode, |
| 46 | headers: responseHeaders, |
| 47 | }); |
| 48 | } |
| 49 | |
| 50 | let shellRendered = false; |
| 51 | const userAgent = request.headers.get("user-agent"); |
| 52 | |
| 53 | // The page's inline scripts carry this nonce, and its policy allows only |
| 54 | // them (lib/page-headers.ts). Not in development, where Vite adds its own. |
| 55 | const nonce = import.meta.env.DEV ? undefined : makeNonce(); |
| 56 | const body = await renderToReadableStream( |
| 57 | <NonceContext value={nonce}> |
| 58 | <ServerRouter context={routerContext} url={request.url} nonce={nonce} /> |
| 59 | </NonceContext>, |
| 60 | { |
| 61 | nonce, |
| 62 | signal: AbortSignal.timeout(streamTimeout + 1000), |
| 63 | onError(error: unknown) { |
| 64 | responseStatusCode = 500; |
| 65 | // Errors while streaming after the shell; those in the shell reject |
| 66 | // and are logged by React Router. |
| 67 | if (shellRendered) { |
| 68 | console.error(error); |
| 69 | } |
| 70 | }, |
| 71 | }, |
| 72 | ); |
| 73 | shellRendered = true; |
| 74 | |
| 75 | // Crawlers get the whole page at once, deferred panels included. |
| 76 | if ((userAgent && isbot(userAgent)) || routerContext.isSpaMode) { |
| 77 | await body.allReady; |
| 78 | } |
| 79 | |
| 80 | responseHeaders.set("Content-Type", "text/html"); |
| 81 | if (nonce) responseHeaders.set("Content-Security-Policy", pagePolicy(nonce, addresses().usercontent)); |
| 82 | return new Response(body, { |
| 83 | headers: responseHeaders, |
| 84 | status: responseStatusCode, |
| 85 | }); |
| 86 | } |