@tanstack/router-core/dist/cjs/ssr/ssr-server.cjs.map

Modern and scalable routing for React applications

{"version":3,"file":"ssr-server.cjs","names":[],"sources":["../../../src/ssr/ssr-server.ts"],"sourcesContent":["import { crossSerializeStream } from 'seroval'\nimport { invariant } from '../invariant'\nimport {\n  createInlineCssPlaceholderAsset,\n  createInlineCssStyleAsset,\n  getStylesheetHref,\n} from '../manifest'\nimport { decodePath } from '../utils'\nimport { createSieveCache } from '../sieve-cache'\nimport { rootRouteId } from '../root'\nimport { _getRenderedMatches } from '../load-client'\nimport { waitForReason } from '../await-signal'\nimport {\n  SSR_SERIALIZATION_SCOPE_ID,\n  createHydrationScripts,\n} from './hydrationScripts'\nimport { dehydrateSsrMatchId } from './ssr-match-id'\nimport { ssrSerovalPlugins } from './serializer/seroval-plugins.ssr'\nimport { makeSsrSerovalPlugin } from './serializer/makeSsrSerovalPlugin'\nimport type { SieveCache } from '../sieve-cache'\nimport type { DehydratedMatch, DehydratedRouter } from './types'\nimport type { AnyRouter, ServerSsr } from '../router'\nimport type { AnyRouteMatch } from '../Matches'\nimport type {\n  Manifest,\n  ManifestRoute,\n  ManifestRouteAssets,\n  ServerManifest,\n} from '../manifest'\n\ntype DehydrationPhase = 'idle' | 'started' | 'disabled'\n\nexport function dehydrateMatch(match: AnyRouteMatch): DehydratedMatch {\n  const dehydratedMatch: DehydratedMatch = {\n    i: dehydrateSsrMatchId(match.id),\n    u: match.updatedAt,\n    s: match.status,\n  }\n\n  const properties = [\n    ['__beforeLoadContext', 'b'],\n    ['loaderData', 'l'],\n    ['error', 'e'],\n    ['ssr', 'ssr'],\n  ] as const\n\n  for (const [key, shorthand] of properties) {\n    if (match[key] !== undefined) {\n      dehydratedMatch[shorthand] = match[key]\n    }\n  }\n  if (match._notFound) {\n    dehydratedMatch.g = true\n  }\n  return dehydratedMatch\n}\n\nfunction disposeSerializationSafely(dispose?: () => void) {\n  try {\n    dispose?.()\n  } catch (err) {\n    console.error('Error disposing SSR serialization:', err)\n  }\n}\n\nfunction notifyAndClearListeners<T>(\n  listeners: Array<(arg: T) => void>,\n  errorMessage: string,\n  arg: T,\n) {\n  const pending = listeners.slice()\n  listeners.length = 0\n  for (const listener of pending) {\n    try {\n      listener(arg)\n    } catch (error) {\n      console.error(errorMessage, error)\n    }\n  }\n}\n\nconst isProd = process.env.NODE_ENV === 'production'\n\ntype FilteredRoutes = Manifest['routes']\n\ntype PreparedMatchedManifestRoutes = {\n  routes: FilteredRoutes\n  hasStrippedRoutes: boolean\n  inlineCssHrefs?: Array<string>\n}\n\ntype ManifestCache = SieveCache<string, PreparedMatchedManifestRoutes>\n\nconst MANIFEST_CACHE_SIZE = 100\nconst manifestCaches = new WeakMap<ServerManifest, ManifestCache>()\n\nfunction getManifestCache(manifest: ServerManifest): ManifestCache {\n  const cache = manifestCaches.get(manifest)\n  if (cache) {\n    return cache\n  }\n  const newCache = createSieveCache<string, PreparedMatchedManifestRoutes>(\n    MANIFEST_CACHE_SIZE,\n  )\n  manifestCaches.set(manifest, newCache)\n  return newCache\n}\n\nfunction getInlineCssForPreparedRoutes(\n  manifest: ServerManifest,\n  preparedRoutes: PreparedMatchedManifestRoutes,\n) {\n  const styles = manifest.inlineCss?.styles\n  const hrefs = preparedRoutes.inlineCssHrefs\n  if (!styles || !hrefs?.length) {\n    return undefined\n  }\n\n  // Joined once per matched route set and request. Retaining the joined copy\n  // on the module cache entry would permanently duplicate shared CSS across\n  // up to MANIFEST_CACHE_SIZE route combinations.\n  let css = ''\n  for (const href of hrefs) {\n    css += styles[href]!\n  }\n\n  return css\n}\n\nfunction getInlineCssAssetForPreparedRoutes(\n  manifest: ServerManifest,\n  preparedRoutes: PreparedMatchedManifestRoutes,\n) {\n  const css = getInlineCssForPreparedRoutes(manifest, preparedRoutes)\n\n  return css === undefined ? undefined : createInlineCssStyleAsset(css)\n}\n\nfunction getMatchedRoutesCacheKey(matches: Array<AnyRouteMatch>) {\n  let cacheKey = ''\n  for (let i = 0; i < matches.length; i++) {\n    cacheKey += (i === 0 ? '' : '\\0') + matches[i]!.routeId\n  }\n  return cacheKey\n}\n\nfunction getPreparedMatchedManifestRoutes(\n  manifest: ServerManifest,\n  matches: Array<AnyRouteMatch>,\n  cacheKey: string,\n) {\n  if (isProd) {\n    const cached = getManifestCache(manifest).get(cacheKey)\n    if (cached) {\n      return cached\n    }\n  }\n\n  const preparedRoutes = prepareMatchedManifestRoutes(manifest, matches)\n\n  if (isProd) {\n    getManifestCache(manifest).set(cacheKey, preparedRoutes)\n  }\n\n  return preparedRoutes\n}\n\nfunction prepareMatchedManifestRoutes(\n  manifest: ServerManifest,\n  matches: Array<AnyRouteMatch>,\n): PreparedMatchedManifestRoutes {\n  const inlineStyles = manifest.inlineCss?.styles\n  const routes: FilteredRoutes = {}\n\n  if (!inlineStyles) {\n    for (const match of matches) {\n      const route = manifest.routes[match.routeId]\n      if (route) {\n        routes[match.routeId] = route\n      }\n    }\n    return { routes, hasStrippedRoutes: false }\n  }\n\n  const inlineCssHrefs: Array<string> = []\n  const seenInlineCssHrefs = new Set<string>()\n  let hasStrippedRoutes = false\n\n  for (const match of matches) {\n    const routeId = match.routeId\n    const route = manifest.routes[routeId]\n    if (!route) {\n      continue\n    }\n\n    const nextRoute = stripInlinedStylesheetAssetsFromRoute(\n      inlineStyles,\n      route,\n      inlineCssHrefs,\n      seenInlineCssHrefs,\n    )\n\n    if (nextRoute !== route) {\n      hasStrippedRoutes = true\n    }\n    routes[routeId] = nextRoute\n  }\n\n  return {\n    routes,\n    hasStrippedRoutes,\n    ...(inlineCssHrefs.length ? { inlineCssHrefs } : {}),\n  }\n}\n\nfunction stripInlinedStylesheetAssetsFromRoute(\n  inlineStyles: Record<string, string>,\n  route: ManifestRoute,\n  inlineCssHrefs: Array<string>,\n  seenInlineCssHrefs: Set<string>,\n): ManifestRoute {\n  const css = route.css\n  if (!css) {\n    return route\n  }\n\n  if (css.length === 0) {\n    const nextRoute = { ...route }\n    delete nextRoute.css\n    return nextRoute\n  }\n\n  let cssLinks: typeof css | undefined\n  for (let i = 0; i < css.length; i++) {\n    const link = css[i]!\n    const href = getStylesheetHref(link)\n    if (inlineStyles[href] === undefined) {\n      if (cssLinks) {\n        cssLinks.push(link)\n      }\n      continue\n    }\n\n    if (!seenInlineCssHrefs.has(href)) {\n      seenInlineCssHrefs.add(href)\n      inlineCssHrefs.push(href)\n    }\n\n    if (!cssLinks) {\n      cssLinks = css.slice(0, i)\n    }\n  }\n\n  if (!cssLinks) {\n    return route\n  }\n\n  if (cssLinks.length > 0) {\n    return { ...route, css: cssLinks }\n  }\n\n  const nextRoute = { ...route }\n  delete nextRoute.css\n  return nextRoute\n}\n\nfunction hasRouteAssets(route: ManifestRoute) {\n  return !!route.scripts?.length || !!route.css?.length\n}\n\nfunction hasRequestAssets(assets: ManifestRouteAssets | undefined) {\n  return !!assets && (!!assets.preloads?.length || hasRouteAssets(assets))\n}\n\nfunction mergeRequestAssetsIntoRootRoute(\n  rootRoute: ManifestRoute | undefined,\n  requestAssets: ManifestRouteAssets | undefined,\n): ManifestRoute {\n  const preloads = requestAssets?.preloads?.length\n    ? [...requestAssets.preloads, ...(rootRoute?.preloads ?? [])]\n    : rootRoute?.preloads\n  const scripts = requestAssets?.scripts?.length\n    ? [...requestAssets.scripts, ...(rootRoute?.scripts ?? [])]\n    : rootRoute?.scripts\n  const cssLinks = requestAssets?.css?.length\n    ? [...requestAssets.css, ...(rootRoute?.css ?? [])]\n    : rootRoute?.css\n\n  return {\n    ...(rootRoute ?? {}),\n    ...(preloads?.length ? { preloads } : {}),\n    ...(scripts?.length ? { scripts } : {}),\n    ...(cssLinks?.length ? { css: cssLinks } : {}),\n  }\n}\n\n/**\n * Compose a client-facing manifest from prepared routes, an optional inline\n * style, and optional request-scoped assets merged into the root route.\n * Shared by the `router.ssr.manifest` getter and `dehydrate()` so the two\n * compositions cannot drift.\n */\nfunction composeManifest(\n  scriptFormat: ServerManifest['scriptFormat'],\n  inlineStyle: Manifest['inlineStyle'],\n  routes: FilteredRoutes,\n  requestAssets: ManifestRouteAssets | undefined,\n): Manifest {\n  const base: Manifest = {\n    ...(scriptFormat ? { scriptFormat } : {}),\n    ...(inlineStyle ? { inlineStyle } : {}),\n    routes,\n  }\n  if (!hasRequestAssets(requestAssets)) {\n    return base\n  }\n  // Merge request-scoped assets into the root route without mutating any\n  // cached route map.\n  return {\n    ...base,\n    routes: {\n      ...routes,\n      [rootRouteId]: mergeRequestAssetsIntoRootRoute(\n        routes[rootRouteId],\n        requestAssets,\n      ),\n    },\n  }\n}\n\nexport function attachRouterServerSsrUtils({\n  router,\n  manifest,\n  getRequestAssets,\n}: {\n  router: AnyRouter\n  manifest: ServerManifest | undefined\n  getRequestAssets?: () => ManifestRouteAssets | undefined\n}) {\n  // Inline CSS joining and route filtering depend only on matched route ids,\n  // so keep that immutable preparation request-local. Request assets can be\n  // discovered between head and Scripts reads and may mutate in place; always\n  // compose their current contents instead of caching by object identity.\n  let memoizedPreparedManifest:\n    | {\n        cacheKey: string\n        inlineCssAsset: Manifest['inlineStyle'] | undefined\n        routes: FilteredRoutes\n      }\n    | undefined\n  router.ssr = {\n    get manifest() {\n      if (!manifest) {\n        return manifest\n      }\n\n      const requestAssets = getRequestAssets?.()\n      const hasAssets = hasRequestAssets(requestAssets)\n\n      if (!hasAssets && !manifest.inlineCss) {\n        return manifest\n      }\n\n      let inlineCssAsset: Manifest['inlineStyle'] | undefined\n      let routes = manifest.routes\n      if (manifest.inlineCss) {\n        const matches = _getRenderedMatches(router.stores.matches.get())\n        const cacheKey = getMatchedRoutesCacheKey(matches)\n        if (memoizedPreparedManifest?.cacheKey === cacheKey) {\n          inlineCssAsset = memoizedPreparedManifest.inlineCssAsset\n          routes = memoizedPreparedManifest.routes\n        } else {\n          const preparedManifest = getPreparedMatchedManifestRoutes(\n            manifest,\n            matches,\n            cacheKey,\n          )\n          inlineCssAsset = getInlineCssAssetForPreparedRoutes(\n            manifest,\n            preparedManifest,\n          )\n          if (preparedManifest.hasStrippedRoutes) {\n            routes = { ...manifest.routes, ...preparedManifest.routes }\n          }\n          memoizedPreparedManifest = { cacheKey, inlineCssAsset, routes }\n        }\n      }\n\n      return composeManifest(\n        manifest.scriptFormat,\n        inlineCssAsset,\n        routes,\n        hasAssets ? requestAssets : undefined,\n      )\n    },\n  }\n  let dehydrationPhase: DehydrationPhase = 'idle'\n  let renderFinished = false\n  const renderFinishedListeners: Array<() => void> = []\n  const cleanupListeners: Array<(settled: boolean) => void> = []\n  let cleanupStarted = false\n  // Every value the router dehydrated has settled: nothing it started can\n  // still be pending when the response ends.\n  let settled = false\n  let disposeSerialization: (() => void) | undefined\n  const hydrationScripts = createHydrationScripts(router.options.ssr?.nonce)\n\n  const serverSsr: ServerSsr = {\n    hydrationScripts,\n    dehydrate: async (opts?: {\n      requestAssets?: ManifestRouteAssets\n      signal?: AbortSignal\n    }) => {\n      // Guard synchronously before the first await: a concurrent second call\n      // would double-serialize and corrupt the hydration payload.\n      if (dehydrationPhase !== 'idle') {\n        if (process.env.NODE_ENV !== 'production') {\n          throw new Error(\n            dehydrationPhase === 'disabled'\n              ? 'Invariant failed: hydration is disabled for this request!'\n              : 'Invariant failed: router is already dehydrated!',\n          )\n        }\n\n        invariant()\n      }\n      opts?.signal?.throwIfAborted()\n      dehydrationPhase = 'started'\n      let matchesToDehydrate = _getRenderedMatches(router.stores.matches.get())\n      const isShell = router.isShell()\n      if (isShell) {\n        // In SPA mode we only want to dehydrate the root match\n        matchesToDehydrate = matchesToDehydrate.slice(0, 1)\n      }\n      const matches = matchesToDehydrate.map(dehydrateMatch)\n\n      let manifestToDehydrate: Manifest | undefined = undefined\n      // Only currently matched routes are dehydrated. Other route assets are\n      // loaded through dynamic imports when those routes become active.\n      if (manifest) {\n        const cacheKey = getMatchedRoutesCacheKey(matchesToDehydrate)\n        const preparedManifest = getPreparedMatchedManifestRoutes(\n          manifest,\n          matchesToDehydrate,\n          cacheKey,\n        )\n\n        manifestToDehydrate = composeManifest(\n          manifest.scriptFormat,\n          preparedManifest.inlineCssHrefs\n            ? createInlineCssPlaceholderAsset()\n            : undefined,\n          preparedManifest.routes,\n          opts?.requestAssets,\n        )\n      }\n      const dehydratedRouter: DehydratedRouter = {\n        manifest: manifestToDehydrate,\n        matches,\n      }\n      const dehydrate = router.options.dehydrate\n      const dehydratedData = dehydrate\n        ? opts?.signal\n          ? await waitForReason(dehydrate.call(router.options), opts.signal)\n          : await dehydrate.call(router.options)\n        : undefined\n      opts?.signal?.throwIfAborted()\n      if (cleanupStarted) {\n        return\n      }\n      if (dehydratedData !== undefined) {\n        dehydratedRouter.dehydratedData = dehydratedData\n      }\n      const trackPlugins = { didRun: false }\n      const serializationAdapters = router.options.serializationAdapters\n      const plugins = serializationAdapters\n        ? [\n            ...serializationAdapters.map((adapter) =>\n              makeSsrSerovalPlugin(adapter, trackPlugins),\n            ),\n            ...ssrSerovalPlugins,\n          ]\n        : ssrSerovalPlugins\n\n      let serializationCompleteSignaled = false\n      let initialSerialized = false\n      const completeScriptSerialization = (\n        result: boolean | { error: unknown },\n      ) => {\n        if (serializationCompleteSignaled || cleanupStarted) {\n          return\n        }\n        serializationCompleteSignaled = true\n        const dispose = disposeSerialization\n        disposeSerialization = undefined\n        if (result === true) {\n          settled = true\n          hydrationScripts.finish()\n        } else if (result) {\n          hydrationScripts.fail(result.error)\n        }\n        if (dispose) {\n          // Seroval invokes completion callbacks before it marks its stream as\n          // inactive. Clear ownership before notifying the hydration consumer,\n          // which can synchronously clean up this request, then dispose later.\n          queueMicrotask(() => disposeSerializationSafely(dispose))\n        }\n      }\n\n      let synchronousFailure: { error: unknown } | undefined\n      const dispose = crossSerializeStream(dehydratedRouter, {\n        refs: new Map(),\n        plugins,\n        onSerialize: (data, initial) => {\n          if (serializationCompleteSignaled || cleanupStarted) {\n            return\n          }\n          initialSerialized ||= initial\n          if (\n            !hydrationScripts.pushSerializedSource(\n              data,\n              initial,\n              trackPlugins.didRun,\n            )\n          ) {\n            // Rejected output stops the producer while deferred work may remain.\n            completeScriptSerialization(false)\n          }\n        },\n        onError: (err: unknown) => {\n          if (serializationCompleteSignaled || cleanupStarted) {\n            return\n          }\n          console.error('Serialization error:', err)\n          synchronousFailure = { error: err }\n          completeScriptSerialization({ error: err })\n        },\n        scopeId: SSR_SERIALIZATION_SCOPE_ID,\n        onDone: () => {\n          if (initialSerialized) {\n            completeScriptSerialization(true)\n          }\n        },\n      })\n      // Seroval can call onDone synchronously before it returns dispose().\n      if (cleanupStarted || serializationCompleteSignaled) {\n        disposeSerializationSafely(dispose)\n      } else {\n        disposeSerialization = dispose\n      }\n      if (synchronousFailure) {\n        throw synchronousFailure.error\n      }\n    },\n    onRenderFinished: (listener) => {\n      if (cleanupStarted) {\n        return\n      }\n      if (renderFinished) {\n        try {\n          listener()\n        } catch (error) {\n          console.error('Error in render finished listener:', error)\n        }\n        return\n      }\n      renderFinishedListeners.push(listener)\n    },\n    onCleanup: (listener) => {\n      if (cleanupStarted) {\n        // Cleanup already happened (or is running). Invoke immediately so\n        // late registrants can still release their resources instead of\n        // silently retaining them (standard disposer convention).\n        try {\n          listener(settled)\n        } catch (error) {\n          console.error('Error in SSR cleanup listener:', error)\n        }\n        return\n      }\n      cleanupListeners.push(listener)\n    },\n    setRenderFinished: () => {\n      if (cleanupStarted || renderFinished) {\n        return\n      }\n      renderFinished = true\n      hydrationScripts.liftBarrier()\n      notifyAndClearListeners(\n        renderFinishedListeners,\n        'Error in render finished listener:',\n        undefined,\n      )\n    },\n    disableHydration: () => {\n      if (cleanupStarted || dehydrationPhase === 'disabled') {\n        return\n      }\n      if (dehydrationPhase !== 'idle') {\n        if (process.env.NODE_ENV !== 'production') {\n          throw new Error(\n            'Invariant failed: cannot disable hydration after dehydrate()!',\n          )\n        }\n\n        invariant()\n      }\n      // The owner rejects later takes/claims; guard order matters so a\n      // throwing owner does not leave the phase half-set.\n      hydrationScripts.disableHydration()\n      dehydrationPhase = 'disabled'\n    },\n    takeInitialHydrationScriptTags:\n      hydrationScripts.takeInitialHydrationScriptTags,\n    cleanup() {\n      // Guard against multiple/reentrant cleanup calls. A listener could call\n      // cleanup() again indirectly; snapshot + clear before invoking so each\n      // listener runs exactly once and reentry is a no-op.\n      if (cleanupStarted) {\n        return\n      }\n      cleanupStarted = true\n      hydrationScripts.cleanup()\n      const dispose = disposeSerialization\n      disposeSerialization = undefined\n      disposeSerializationSafely(dispose)\n      notifyAndClearListeners(\n        cleanupListeners,\n        'Error in SSR cleanup listener:',\n        settled,\n      )\n      renderFinishedListeners.length = 0\n      router.ssr = undefined\n      router.serverSsr = undefined\n    },\n  }\n\n  router.serverSsr = serverSsr\n  for (const listener of router.serverSsrLifecycle?.onServerSsrAttach ?? []) {\n    try {\n      listener(serverSsr)\n    } catch (err) {\n      console.error('SSR attach listener error:', err)\n    }\n  }\n}\n\n/**\n * Get the origin for the request.\n *\n * SECURITY: We intentionally do NOT trust the Origin header for determining\n * the router's origin. The Origin header can be spoofed by attackers, which\n * could lead to SSRF-like vulnerabilities where redirects are constructed\n * using a malicious origin (CVE-2024-34351).\n *\n * Instead, we derive the origin from request.url, which is typically set by\n * the server infrastructure (not client-controlled headers).\n *\n * For applications behind proxies that need to trust forwarded headers,\n * use the router's `origin` option to explicitly configure a trusted origin.\n */\nexport function getOrigin(request: Request) {\n  try {\n    return new URL(request.url).origin\n  } catch {}\n  return 'http://localhost'\n}\n\n// server and browser can decode/encode characters differently in paths and search params.\n// Server generally strictly follows the WHATWG URL Standard, while browsers may differ for legacy reasons.\n// for example, in paths \"|\" is not encoded on the server but is encoded on chromium (and not on firefox) while \"대\" is encoded on both sides.\n// Another anomaly is that in Node new URLSearchParams and new URL also decode/encode characters differently.\n// new URLSearchParams() encodes \"|\" while new URL() does not, and in this instance\n// chromium treats search params differently than paths, i.e. \"|\" is not encoded in search params.\nexport function getNormalizedURL(url: string | URL, base?: string | URL) {\n  // ensure backslashes are encoded correctly in the URL\n  if (typeof url === 'string') {\n    url = url.replace('\\\\', '%5C')\n  }\n\n  const rawUrl = new URL(url, base)\n  // URL parsing has already handled backslashes and ignored controls. A pathname\n  // like \"//evil.example\" would become a protocol-relative URL when rebuilt below.\n  const handledProtocolRelativeURL = rawUrl.pathname.startsWith('//')\n  const decodedPathname = decodePath(\n    handledProtocolRelativeURL\n      ? rawUrl.pathname.replace(/^\\/+/, '/')\n      : rawUrl.pathname,\n  )\n  const searchParams = new URLSearchParams(rawUrl.search)\n  const normalizedHref =\n    decodedPathname +\n    (searchParams.size > 0 ? '?' : '') +\n    searchParams.toString() +\n    rawUrl.hash\n\n  return {\n    url: new URL(normalizedHref, rawUrl.origin),\n    handledProtocolRelativeURL,\n  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