/opt/canhelp/node_modules/next/dist/esm/server/api-utils/node
Edit: /opt/canhelp/node_modules/next/dist/esm/server/api-utils/node/try-get-preview-data.js (3046B)
import { checkIsOnDemandRevalidate } from '../.';
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, res, options, multiZoneDraftMode) {
var _cookies_get, _cookies_get1;
// 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[SYMBOL_PREVIEW_DATA];
}
const headers = HeadersAdapter.from(req.headers);
const cookies = new RequestCookies(headers);
const previewModeId = (_cookies_get = cookies.get(COOKIE_NAME_PRERENDER_BYPASS)) == null ? void 0 : _cookies_get.value;
const tokenPreviewData = (_cookies_get1 = cookies.get(COOKIE_NAME_PRERENDER_DATA)) == null ? void 0 : _cookies_get1.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);
}
return false;
}
// Case: preview session is for an old build.
if (previewModeId !== options.previewModeId) {
if (!multiZoneDraftMode) {
clearPreviewData(res);
}
return false;
}
let encryptedPreviewData;
try {
const jsonwebtoken = require('next/dist/compiled/jsonwebtoken');
encryptedPreviewData = jsonwebtoken.verify(tokenPreviewData, options.previewModeSigningKey);
} catch {
// TODO: warn
clearPreviewData(res);
return false;
}
const { decryptWithSecret } = require('../../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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