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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.')
}
}
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