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import type {
MiddlewareConfig,
MiddlewareMatcher,
} from '../../analysis/get-page-static-info'
import { getModuleBuildInfo } from './get-module-build-info'
import { MIDDLEWARE_LOCATION_REGEXP } from '../../../lib/constants'
import { loadEntrypoint } from '../../load-entrypoint'
export type MiddlewareLoaderOptions = {
absolutePagePath: string
page: string
rootDir: string
matchers?: string
preferredRegion: string | string[] | undefined
middlewareConfig: string
}
// matchers can have special characters that break the loader params
// parsing so we base64 encode/decode the string
export function encodeMatchers(matchers: MiddlewareMatcher[]) {
return Buffer.from(JSON.stringify(matchers)).toString('base64')
}
export function decodeMatchers(encodedMatchers: string) {
return JSON.parse(
Buffer.from(encodedMatchers, 'base64').toString()
) as MiddlewareMatcher[]
}
export default async function middlewareLoader(this: any) {
const {
absolutePagePath,
page,
rootDir,
matchers: encodedMatchers,
preferredRegion,
middlewareConfig: middlewareConfigBase64,
}: MiddlewareLoaderOptions = this.getOptions()
const matchers = encodedMatchers ? decodeMatchers(encodedMatchers) : undefined
const pagePath = this.utils.contextify(
this.context || this.rootContext,
absolutePagePath
)
const middlewareConfig: MiddlewareConfig = JSON.parse(
Buffer.from(middlewareConfigBase64, 'base64').toString()
)
const buildInfo = getModuleBuildInfo(this._module)
buildInfo.nextEdgeMiddleware = {
matchers,
page:
page.replace(new RegExp(`/${MIDDLEWARE_LOCATION_REGEXP}$`), '') || '/',
}
buildInfo.rootDir = rootDir
buildInfo.route = {
page,
absolutePagePath,
preferredRegion,
middlewareConfig,
}
return await loadEntrypoint('middleware', {
VAR_USERLAND: pagePath,
VAR_DEFINITION_PAGE: page,
})
}
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