react-code-dataset / next.js /packages /next /src /server /app-render /parse-and-validate-flight-router-state.tsx
| import type { FlightRouterState } from './types' | |
| import { flightRouterStateSchema } from './types' | |
| import { assert } from 'next/dist/compiled/superstruct' | |
| export function parseAndValidateFlightRouterState( | |
| stateHeader: string | string[] | |
| ): FlightRouterState | |
| export function parseAndValidateFlightRouterState( | |
| stateHeader: undefined | |
| ): undefined | |
| export function parseAndValidateFlightRouterState( | |
| stateHeader: string | string[] | undefined | |
| ): FlightRouterState | undefined | |
| export function parseAndValidateFlightRouterState( | |
| stateHeader: string | string[] | undefined | |
| ): FlightRouterState | undefined { | |
| if (typeof stateHeader === 'undefined') { | |
| return undefined | |
| } | |
| if (Array.isArray(stateHeader)) { | |
| throw new Error( | |
| 'Multiple router state headers were sent. This is not allowed.' | |
| ) | |
| } | |
| // We limit the size of the router state header to ~40kb. This is to prevent | |
| // a malicious user from sending a very large header and slowing down the | |
| // resolving of the router state. | |
| // This is around 2,000 nested or parallel route segment states: | |
| // '{"children":["",{}]}'.length === 20. | |
| if (stateHeader.length > 20 * 2000) { | |
| throw new Error('The router state header was too large.') | |
| } | |
| try { | |
| const state = JSON.parse(decodeURIComponent(stateHeader)) | |
| assert(state, flightRouterStateSchema) | |
| return state | |
| } catch { | |
| throw new Error('The router state header was sent but could not be parsed.') | |
| } | |
| } | |