LittleDemon WebShell

{"version":3,"sources":["../../src/client/flight-data-helpers.ts"],"sourcesContent":["import type {\n  CacheNodeSeedData,\n  FlightData,\n  FlightDataPath,\n  FlightRouterState,\n  FlightSegmentPath,\n  Segment,\n  HeadData,\n  InitialRSCPayload,\n} from '../shared/lib/app-router-types'\nimport { PAGE_SEGMENT_KEY } from '../shared/lib/segment'\nimport type { NormalizedSearch } from './components/segment-cache/cache-key'\nimport {\n  getCacheKeyForDynamicParam,\n  parseDynamicParamFromURLPart,\n  doesStaticSegmentAppearInURL,\n  getRenderedPathname,\n  getRenderedSearch,\n} from './route-params'\nimport { createHrefFromUrl } from './components/router-reducer/create-href-from-url'\n\nexport type NormalizedFlightData = {\n  /**\n   * The full `FlightSegmentPath` inclusive of the final `Segment`\n   */\n  segmentPath: FlightSegmentPath\n  /**\n   * The `FlightSegmentPath` exclusive of the final `Segment`\n   */\n  pathToSegment: FlightSegmentPath\n  segment: Segment\n  tree: FlightRouterState\n  seedData: CacheNodeSeedData | null\n  head: HeadData\n  isHeadPartial: boolean\n  isRootRender: boolean\n}\n\n// TODO: We should only have to export `normalizeFlightData`, however because the initial flight data\n// that gets passed to `createInitialRouterState` doesn't conform to the `FlightDataPath` type (it's missing the root segment)\n// we're currently exporting it so we can use it directly. This should be fixed as part of the unification of\n// the different ways we express `FlightSegmentPath`.\nexport function getFlightDataPartsFromPath(\n  flightDataPath: FlightDataPath\n): NormalizedFlightData {\n  // Pick the last 4 items from the `FlightDataPath` to get the [tree, seedData, viewport, isHeadPartial].\n  const flightDataPathLength = 4\n  // tree, seedData, and head are *always* the last three items in the `FlightDataPath`.\n  const [tree, seedData, head, isHeadPartial] =\n    flightDataPath.slice(-flightDataPathLength)\n  // The `FlightSegmentPath` is everything except the last three items. For a root render, it won't be present.\n  const segmentPath = flightDataPath.slice(0, -flightDataPathLength)\n\n  return {\n    // TODO: Unify these two segment path helpers. We are inconsistently pushing an empty segment (\"\")\n    // to the start of the segment path in some places which makes it hard to use solely the segment path.\n    // Look for \"// TODO-APP: remove ''\" in the codebase.\n    pathToSegment: segmentPath.slice(0, -1),\n    segmentPath,\n    // if the `FlightDataPath` corresponds with the root, there'll be no segment path,\n    // in which case we default to ''.\n    segment: segmentPath[segmentPath.length - 1] ?? '',\n    tree,\n    seedData,\n    head,\n    isHeadPartial,\n    isRootRender: flightDataPath.length === flightDataPathLength,\n  }\n}\n\nexport function createInitialRSCPayloadFromFallbackPrerender(\n  response: Response,\n  fallbackInitialRSCPayload: InitialRSCPayload\n): InitialRSCPayload {\n  // This is a static fallback page. In order to hydrate the page, we need to\n  // parse the client params from the URL, but to account for the possibility\n  // that the page was rewritten, we need to check the response headers\n  // for x-nextjs-rewritten-path or x-nextjs-rewritten-query headers. Since\n  // we can't access the headers of the initial document response, the client\n  // performs a fetch request to the current location. Since it's possible that\n  // the fetch request will be dynamically rewritten to a different path than\n  // the initial document, this fetch request delivers _all_ the hydration data\n  // for the page; it was not inlined into the document, like it normally\n  // would be.\n  //\n  // TODO: Consider treating the case where fetch is rewritten to a different\n  // path from the document as a special deopt case. We should optimistically\n  // assume this won't happen, inline the data into the document, and perform\n  // a minimal request (like a HEAD or range request) to verify that the\n  // response matches. Tricky to get right because we need to account for\n  // all the different deployment environments we support, like output:\n  // \"export\" mode, where we currently don't assume that custom response\n  // headers are present.\n\n  // Patch the Flight data sent by the server with the correct params parsed\n  // from the URL + response object.\n  const renderedPathname = getRenderedPathname(response)\n  const renderedSearch = getRenderedSearch(response)\n  const canonicalUrl = createHrefFromUrl(new URL(location.href))\n  const originalFlightDataPath = fallbackInitialRSCPayload.f[0]\n  const originalFlightRouterState = originalFlightDataPath[0]\n  return {\n    b: fallbackInitialRSCPayload.b,\n    c: canonicalUrl.split('/'),\n    q: renderedSearch,\n    i: fallbackInitialRSCPayload.i,\n    f: [\n      [\n        fillInFallbackFlightRouterState(\n          originalFlightRouterState,\n          renderedPathname,\n          renderedSearch as NormalizedSearch\n        ),\n        originalFlightDataPath[1],\n        originalFlightDataPath[2],\n        originalFlightDataPath[2],\n      ],\n    ],\n    m: fallbackInitialRSCPayload.m,\n    G: fallbackInitialRSCPayload.G,\n    S: fallbackInitialRSCPayload.S,\n  }\n}\n\nfunction fillInFallbackFlightRouterState(\n  flightRouterState: FlightRouterState,\n  renderedPathname: string,\n  renderedSearch: NormalizedSearch\n): FlightRouterState {\n  const pathnameParts = renderedPathname.split('/').filter((p) => p !== '')\n  const index = 0\n  return fillInFallbackFlightRouterStateImpl(\n    flightRouterState,\n    renderedSearch,\n    pathnameParts,\n    index\n  )\n}\n\nfunction fillInFallbackFlightRouterStateImpl(\n  flightRouterState: FlightRouterState,\n  renderedSearch: NormalizedSearch,\n  pathnameParts: Array<string>,\n  pathnamePartsIndex: number\n): FlightRouterState {\n  const originalSegment = flightRouterState[0]\n  let newSegment: Segment\n  let doesAppearInURL: boolean\n  if (typeof originalSegment === 'string') {\n    newSegment = originalSegment\n    doesAppearInURL = doesStaticSegmentAppearInURL(originalSegment)\n  } else {\n    const paramName = originalSegment[0]\n    const paramType = originalSegment[2]\n    const paramValue = parseDynamicParamFromURLPart(\n      paramType,\n      pathnameParts,\n      pathnamePartsIndex\n    )\n    const cacheKey = getCacheKeyForDynamicParam(paramValue, renderedSearch)\n    newSegment = [paramName, cacheKey, paramType]\n    doesAppearInURL = true\n  }\n\n  // Only increment the index if the segment appears in the URL. If it's a\n  // \"virtual\" segment, like a route group, it remains the same.\n  const childPathnamePartsIndex = doesAppearInURL\n    ? pathnamePartsIndex + 1\n    : pathnamePartsIndex\n\n  const children = flightRouterState[1]\n  const newChildren: { [key: string]: FlightRouterState } = {}\n  for (let key in children) {\n    const childFlightRouterState = children[key]\n    newChildren[key] = fillInFallbackFlightRouterStateImpl(\n      childFlightRouterState,\n      renderedSearch,\n      pathnameParts,\n      childPathnamePartsIndex\n    )\n  }\n\n  const newState: FlightRouterState = [\n    newSegment,\n    newChildren,\n    null,\n    flightRouterState[3],\n    flightRouterState[4],\n  ]\n  return newState\n}\n\nexport function getNextFlightSegmentPath(\n  flightSegmentPath: FlightSegmentPath\n): FlightSegmentPath {\n  // Since `FlightSegmentPath` is a repeated tuple of `Segment` and `ParallelRouteKey`, we slice off two items\n  // to get the next segment path.\n  return flightSegmentPath.slice(2)\n}\n\nexport function normalizeFlightData(\n  flightData: FlightData\n): NormalizedFlightData[] | string {\n  // FlightData can be a string when the server didn't respond with a proper flight response,\n  // or when a redirect happens, to signal to the client that it needs to perform an MPA navigation.\n  if (typeof flightData === 'string') {\n    return flightData\n  }\n\n  return flightData.map((flightDataPath) =>\n    getFlightDataPartsFromPath(flightDataPath)\n  )\n}\n\n/**\n * This function is used to prepare the flight router state for the request.\n * It removes markers that are not needed by the server, and are purely used\n * for stashing state on the client.\n * @param flightRouterState - The flight router state to prepare.\n * @param isHmrRefresh - Whether this is an HMR refresh request.\n * @returns The prepared flight router state.\n */\nexport function prepareFlightRouterStateForRequest(\n  flightRouterState: FlightRouterState,\n  isHmrRefresh?: boolean\n): string {\n  // HMR requests need the complete, unmodified state for proper functionality\n  if (isHmrRefresh) {\n    return encodeURIComponent(JSON.stringify(flightRouterState))\n  }\n\n  return encodeURIComponent(\n    JSON.stringify(stripClientOnlyDataFromFlightRouterState(flightRouterState))\n  )\n}\n\n/**\n * Recursively strips client-only data from FlightRouterState while preserving\n * server-needed information for proper rendering decisions.\n */\nfunction stripClientOnlyDataFromFlightRouterState(\n  flightRouterState: FlightRouterState\n): FlightRouterState {\n  const [\n    segment,\n    parallelRoutes,\n    _url, // Intentionally unused - URLs are client-only\n    refreshMarker,\n    isRootLayout,\n    hasLoadingBoundary,\n  ] = flightRouterState\n\n  // __PAGE__ segments are always fetched from the server, so there's\n  // no need to send them up\n  const cleanedSegment = stripSearchParamsFromPageSegment(segment)\n\n  // Recursively process parallel routes\n  const cleanedParallelRoutes: { [key: string]: FlightRouterState } = {}\n  for (const [key, childState] of Object.entries(parallelRoutes)) {\n    cleanedParallelRoutes[key] =\n      stripClientOnlyDataFromFlightRouterState(childState)\n  }\n\n  const result: FlightRouterState = [\n    cleanedSegment,\n    cleanedParallelRoutes,\n    null, // URLs omitted - server reconstructs paths from segments\n    shouldPreserveRefreshMarker(refreshMarker) ? refreshMarker : null,\n  ]\n\n  // Append optional fields if present\n  if (isRootLayout !== undefined) {\n    result[4] = isRootLayout\n  }\n  if (hasLoadingBoundary !== undefined) {\n    result[5] = hasLoadingBoundary\n  }\n\n  return result\n}\n\n/**\n * Strips search parameters from __PAGE__ segments to prevent sensitive\n * client-side data from being sent to the server.\n */\nfunction stripSearchParamsFromPageSegment(segment: Segment): Segment {\n  if (\n    typeof segment === 'string' &&\n    segment.startsWith(PAGE_SEGMENT_KEY + '?')\n  ) 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