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import type { IncomingMessage, ServerResponse } from 'http'
import type { NextApiResponse } from '../../../shared/lib/utils'
import { checkIsOnDemandRevalidate } from '../.'
import type { __ApiPreviewProps } from '../.'
import type { BaseNextRequest, BaseNextResponse } from '../../base-http'
import type { PreviewData } from '../../../types'
import {
clearPreviewData,
COOKIE_NAME_PRERENDER_BYPASS,
COOKIE_NAME_PRERENDER_DATA,
SYMBOL_PREVIEW_DATA,
} from '../index'
import { RequestCookies } from '../../web/spec-extension/cookies'
import { HeadersAdapter } from '../../web/spec-extension/adapters/headers'
export function tryGetPreviewData(
req: IncomingMessage | BaseNextRequest | Request,
res: ServerResponse | BaseNextResponse,
options: __ApiPreviewProps,
multiZoneDraftMode: boolean
): PreviewData {
// if an On-Demand revalidation is being done preview mode
// is disabled
if (options && checkIsOnDemandRevalidate(req, options).isOnDemandRevalidate) {
return false
}
// Read cached preview data if present
// TODO: use request metadata instead of a symbol
if (SYMBOL_PREVIEW_DATA in req) {
return (req as any)[SYMBOL_PREVIEW_DATA] as any
}
const headers = HeadersAdapter.from(req.headers)
const cookies = new RequestCookies(headers)
const previewModeId = cookies.get(COOKIE_NAME_PRERENDER_BYPASS)?.value
const tokenPreviewData = cookies.get(COOKIE_NAME_PRERENDER_DATA)?.value
// Case: preview mode cookie set but data cookie is not set
if (
previewModeId &&
!tokenPreviewData &&
previewModeId === options.previewModeId
) {
// This is "Draft Mode" which doesn't use
// previewData, so we return an empty object
// for backwards compat with "Preview Mode".
const data = {}
Object.defineProperty(req, SYMBOL_PREVIEW_DATA, {
value: data,
enumerable: false,
})
return data
}
// Case: neither cookie is set.
if (!previewModeId && !tokenPreviewData) {
return false
}
// Case: one cookie is set, but not the other.
if (!previewModeId || !tokenPreviewData) {
if (!multiZoneDraftMode) {
clearPreviewData(res as NextApiResponse)
}
return false
}
// Case: preview session is for an old build.
if (previewModeId !== options.previewModeId) {
if (!multiZoneDraftMode) {
clearPreviewData(res as NextApiResponse)
}
return false
}
let encryptedPreviewData: {
data: string
}
try {
const jsonwebtoken =
require('next/dist/compiled/jsonwebtoken') as typeof import('next/dist/compiled/jsonwebtoken')
encryptedPreviewData = jsonwebtoken.verify(
tokenPreviewData,
options.previewModeSigningKey
) as typeof encryptedPreviewData
} catch {
// TODO: warn
clearPreviewData(res as NextApiResponse)
return false
}
const { decryptWithSecret } =
require('../../crypto-utils') as typeof import('../../crypto-utils')
const decryptedPreviewData = decryptWithSecret(
Buffer.from(options.previewModeEncryptionKey),
encryptedPreviewData.data
)
try {
// TODO: strict runtime type checking
const data = JSON.parse(decryptedPreviewData)
// Cache lookup
Object.defineProperty(req, SYMBOL_PREVIEW_DATA, {
value: data,
enumerable: false,
})
return data
} catch {
return false
}
}
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