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import type { ParsedUrlQuery } from 'querystring'
import type { Rewrite } from '../../../../lib/load-custom-routes'
import { getPathMatch } from './path-match'
import { matchHas, prepareDestination } from './prepare-destination'
import { removeTrailingSlash } from './remove-trailing-slash'
import { normalizeLocalePath } from '../../i18n/normalize-locale-path'
import { removeBasePath } from '../../../../client/remove-base-path'
import { parseRelativeUrl, type ParsedRelativeUrl } from './parse-relative-url'
interface ParsedAs extends Omit<ParsedRelativeUrl, 'slashes'> {
slashes: boolean | undefined
}
export default function resolveRewrites(
asPath: string,
pages: string[],
rewrites: {
beforeFiles: Rewrite[]
afterFiles: Rewrite[]
fallback: Rewrite[]
},
query: ParsedUrlQuery,
resolveHref: (path: string) => string,
locales?: readonly string[]
): {
matchedPage: boolean
parsedAs: ParsedAs
asPath: string
resolvedHref?: string
externalDest?: boolean
} {
let matchedPage = false
let externalDest = false
let parsedAs: ParsedAs = parseRelativeUrl(asPath)
let fsPathname = removeTrailingSlash(
normalizeLocalePath(removeBasePath(parsedAs.pathname), locales).pathname
)
let resolvedHref
const handleRewrite = (rewrite: Rewrite) => {
const matcher = getPathMatch(
rewrite.source + (process.env.__NEXT_TRAILING_SLASH ? '(/)?' : ''),
{
removeUnnamedParams: true,
strict: true,
}
)
let params = matcher(parsedAs.pathname)
if ((rewrite.has || rewrite.missing) && params) {
const hasParams = matchHas(
{
headers: {
host: document.location.hostname,
'user-agent': navigator.userAgent,
},
cookies: document.cookie
.split('; ')
.reduce<Record<string, string>>((acc, item) => {
const [key, ...value] = item.split('=')
acc[key] = value.join('=')
return acc
}, {}),
} as any,
parsedAs.query,
rewrite.has,
rewrite.missing
)
if (hasParams) {
Object.assign(params, hasParams)
} else {
params = false
}
}
if (params) {
if (!rewrite.destination) {
// this is a proxied rewrite which isn't handled on the client
externalDest = true
return true
}
const destRes = prepareDestination({
appendParamsToQuery: true,
destination: rewrite.destination,
params: params,
query: query,
})
parsedAs = destRes.parsedDestination
asPath = destRes.newUrl
Object.assign(query, destRes.parsedDestination.query)
fsPathname = removeTrailingSlash(
normalizeLocalePath(removeBasePath(asPath), locales).pathname
)
if (pages.includes(fsPathname)) {
// check if we now match a page as this means we are done
// resolving the rewrites
matchedPage = true
resolvedHref = fsPathname
return true
}
// check if we match a dynamic-route, if so we break the rewrites chain
resolvedHref = resolveHref(fsPathname)
if (resolvedHref !== asPath && pages.includes(resolvedHref)) {
matchedPage = true
return true
}
}
}
let finished = false
for (let i = 0; i < rewrites.beforeFiles.length; i++) {
// we don't end after match in beforeFiles to allow
// continuing through all beforeFiles rewrites
handleRewrite(rewrites.beforeFiles[i])
}
matchedPage = pages.includes(fsPathname)
if (!matchedPage) {
if (!finished) {
for (let i = 0; i < rewrites.afterFiles.length; i++) {
if (handleRewrite(rewrites.afterFiles[i])) {
finished = true
break
}
}
}
// check dynamic route before processing fallback rewrites
if (!finished) {
resolvedHref = resolveHref(fsPathname)
matchedPage = pages.includes(resolvedHref)
finished = matchedPage
}
if (!finished) {
for (let i = 0; i < rewrites.fallback.length; i++) {
if (handleRewrite(rewrites.fallback[i])) {
finished = true
break
}
}
}
}
return {
asPath,
parsedAs,
matchedPage,
resolvedHref,
externalDest,
}
}
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