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import { normalizeLocalePath } from '../../i18n/normalize-locale-path'
import { removePathPrefix } from './remove-path-prefix'
import { pathHasPrefix } from './path-has-prefix'
import type { I18NProvider } from '../../../../server/lib/i18n-provider'
export interface NextPathnameInfo {
/**
* The base path in case the pathname included it.
*/
basePath?: string
/**
* The buildId for when the parsed URL is a data URL. Parsing it can be
* disabled with the `parseData` option.
*/
buildId?: string
/**
* If there was a locale in the pathname, this will hold its value.
*/
locale?: string
/**
* The processed pathname without a base path, locale, or data URL elements
* when parsing it is enabled.
*/
pathname: string
/**
* A boolean telling if the pathname had a trailingSlash. This can be only
* true if trailingSlash is enabled.
*/
trailingSlash?: boolean
}
interface Options {
/**
* When passed to true, this function will also parse Nextjs data URLs.
*/
parseData?: boolean
/**
* A partial of the Next.js configuration to parse the URL.
*/
nextConfig?: {
basePath?: string
i18n?: { locales?: readonly string[] } | null
trailingSlash?: boolean
}
/**
* If provided, this normalizer will be used to detect the locale instead of
* the default locale detection.
*/
i18nProvider?: I18NProvider
}
export function getNextPathnameInfo(
pathname: string,
options: Options
): NextPathnameInfo {
const { basePath, i18n, trailingSlash } = options.nextConfig ?? {}
const info: NextPathnameInfo = {
pathname,
trailingSlash: pathname !== '/' ? pathname.endsWith('/') : trailingSlash,
}
if (basePath && pathHasPrefix(info.pathname, basePath)) {
info.pathname = removePathPrefix(info.pathname, basePath)
info.basePath = basePath
}
let pathnameNoDataPrefix = info.pathname
if (
info.pathname.startsWith('/_next/data/') &&
info.pathname.endsWith('.json')
) {
const paths = info.pathname
.replace(/^\/_next\/data\//, '')
.replace(/\.json$/, '')
.split('/')
const buildId = paths[0]
info.buildId = buildId
pathnameNoDataPrefix =
paths[1] !== 'index' ? `/${paths.slice(1).join('/')}` : '/'
// update pathname with normalized if enabled although
// we use normalized to populate locale info still
if (options.parseData === true) {
info.pathname = pathnameNoDataPrefix
}
}
// If provided, use the locale route normalizer to detect the locale instead
// of the function below.
if (i18n) {
let result = options.i18nProvider
? options.i18nProvider.analyze(info.pathname)
: normalizeLocalePath(info.pathname, i18n.locales)
info.locale = result.detectedLocale
info.pathname = result.pathname ?? info.pathname
if (!result.detectedLocale && info.buildId) {
result = options.i18nProvider
? options.i18nProvider.analyze(pathnameNoDataPrefix)
: normalizeLocalePath(pathnameNoDataPrefix, i18n.locales)
if (result.detectedLocale) {
info.locale = result.detectedLocale
}
}
}
return info
}
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