| import { getRequestMeta, type NextIncomingMessage } from '../request-meta' | |
| type PatchableResponse = { | |
| setHeader(key: string, value: string | string[]): PatchableResponse | |
| } | |
| /** | |
| * Ensure cookies set in middleware are merged and not overridden by API | |
| * routes/getServerSideProps. | |
| * | |
| * @param req Incoming request | |
| * @param res Outgoing response | |
| */ | |
| export function patchSetHeaderWithCookieSupport( | |
| req: NextIncomingMessage, | |
| res: PatchableResponse | |
| ) { | |
| const setHeader = res.setHeader.bind(res) | |
| res.setHeader = ( | |
| name: string, | |
| value: string | string[] | |
| ): PatchableResponse => { | |
| // When renders /_error after page is failed, it could attempt to set | |
| // headers after headers. | |
| if ('headersSent' in res && res.headersSent) { | |
| return res | |
| } | |
| if (name.toLowerCase() === 'set-cookie') { | |
| const middlewareValue = getRequestMeta(req, 'middlewareCookie') | |
| if ( | |
| !middlewareValue || | |
| !Array.isArray(value) || | |
| !value.every((item, idx) => item === middlewareValue[idx]) | |
| ) { | |
| value = [ | |
| // TODO: (wyattjoh) find out why this is called multiple times resulting in duplicate cookies being added | |
| ...new Set([ | |
| ...(middlewareValue || []), | |
| ...(typeof value === 'string' | |
| ? [value] | |
| : Array.isArray(value) | |
| ? value | |
| : []), | |
| ]), | |
| ] | |
| } | |
| } | |
| return setHeader(name, value) | |
| } | |
| } | |