{"version":3,"sources":["../src/i18n/resolver.ts"],"sourcesContent":["import { localizeFarmPathname, resolveFarmLocalePath } from \"./routing\";\nimport { stripFarmBasePath } from \"../base-path\";\nimport type { FarmI18nLocaleSource, ResolvedFarmI18nConfig } from \"./types\";\n\nexport interface FarmLocaleResolution {\n  locale: string;\n  source: FarmI18nLocaleSource;\n  pathname: string;\n  redirect?: string;\n  persist: boolean;\n}\n\nexport function getFarmLocaleVaryHeaders(\n  config: ResolvedFarmI18nConfig,\n  resolution: FarmLocaleResolution,\n): string[] {\n  if (!config.enabled || resolution.source === \"url\") return [];\n\n  const headers: string[] = [];\n  if (config.detection.includes(\"cookie\")) headers.push(\"Cookie\");\n  if (config.detection.includes(\"accept-language\")) headers.push(\"Accept-Language\");\n  return headers;\n}\n\nexport function resolveFarmLocaleRequest(\n  request: Request,\n  config: ResolvedFarmI18nConfig,\n  options: { redirect?: boolean } = {},\n): FarmLocaleResolution {\n  const url = new URL(request.url);\n  if (!config.enabled) {\n    return {\n      locale: config.defaultLocale,\n      source: \"default\",\n      pathname: url.pathname,\n      persist: false,\n    };\n  }\n\n  const pathMatch = resolveFarmLocalePath(url.pathname, config);\n  if (pathMatch.explicit && pathMatch.locale) {\n    const canonicalPath = localizeFarmPathname(pathMatch.pathname, pathMatch.locale, config);\n    // The locale canonical is always trailing-slash-free, but the app's dedicated\n    // trailing-slash redirect owns that normalization. When the only difference is\n    // a trailing slash, defer to it: otherwise, under trailingSlash: true, the i18n\n    // redirect (strip) and the trailing-slash redirect (add) bounce a locale URL\n    // between 307 and 308 forever and every locale page becomes unreachable.\n    const differsOnlyByTrailingSlash =\n      canonicalPath !== url.pathname &&\n      (url.pathname.length > 1 ? url.pathname.replace(/\\/+$/, \"\") : url.pathname) === canonicalPath;\n    const redirect =\n      options.redirect !== false && canonicalPath !== url.pathname && !differsOnlyByTrailingSlash\n        ? `${canonicalPath}${url.search}${url.hash}`\n        : undefined;\n    return {\n      locale: pathMatch.locale,\n      source: \"url\",\n      pathname: pathMatch.pathname,\n      redirect,\n      // Locale-prefixed pages are canonical and can be cached publicly. Locale\n      // switchers persist the same choice before navigating in the browser.\n      persist: false,\n    };\n  }\n\n  const detected = detectLocale(request, config);\n  const shouldRedirect =\n    options.redirect !== false &&\n    !isInternalOrApiPath(stripFarmBasePath(url.pathname, config.basePath)) &&\n    config.routing !== \"none\" &&\n    (config.routing === \"prefix-always\" || detected.locale !== config.defaultLocale);\n\n  return {\n    locale: detected.locale,\n    source: detected.source,\n    pathname: pathMatch.pathname,\n    redirect: shouldRedirect\n      ? `${localizeFarmPathname(pathMatch.pathname, detected.locale, config)}${url.search}${url.hash}`\n      : undefined,\n    persist: detected.source !== \"default\",\n  };\n}\n\nexport function createFarmLocaleCookie(\n  locale: string,\n  config: Pick<ResolvedFarmI18nConfig, \"cookie\">,\n): string {\n  const cookie = config.cookie;\n  let value = `${encodeURIComponent(cookie.name)}=${encodeURIComponent(locale)}`;\n  value += `; Max-Age=${cookie.maxAge}`;\n  value += `; Path=${cookie.path}`;\n  value += `; SameSite=${capitalize(cookie.sameSite)}`;\n  if (cookie.secure) value += \"; Secure\";\n  return value;\n}\n\nexport function matchFarmLocale(\n  requested: string | null | undefined,\n  locales: readonly string[],\n): string | undefined {\n  if (!requested) return undefined;\n  let canonical: string;\n  try {\n    canonical = Intl.getCanonicalLocales(requested)[0]!;\n  } catch {\n    return undefined;\n  }\n\n  const exact = locales.find((locale) => locale.toLowerCase() === canonical.toLowerCase());\n  if (exact) return exact;\n\n  const language = canonical.split(\"-\")[0]?.toLowerCase();\n  const base = locales.find((locale) => locale.toLowerCase() === language);\n  if (base) return base;\n  return locales.find((locale) => locale.split(\"-\")[0]?.toLowerCase() === language);\n}\n\nfunction detectLocale(\n  request: Request,\n  config: ResolvedFarmI18nConfig,\n): { locale: string; source: FarmI18nLocaleSource } {\n  for (const signal of config.detection) {\n    if (signal === \"url\") continue;\n\n    if (signal === \"cookie\") {\n      const locale = matchFarmLocale(\n        readCookie(request.headers.get(\"cookie\"), config.cookie.name),\n        config.locales,\n      );\n      if (locale) return { locale, source: \"cookie\" };\n    }\n\n    if (signal === \"accept-language\") {\n      const locale = resolveAcceptLanguage(request.headers.get(\"accept-language\"), config.locales);\n      if (locale) return { locale, source: \"accept-language\" };\n    }\n  }\n\n  return { locale: config.defaultLocale, source: \"default\" };\n}\n\nfunction resolveAcceptLanguage(\n  header: string | null,\n  locales: readonly string[],\n): string | undefined {\n  if (!header) return undefined;\n\n  const byRange = new Map<string, { locale: string; quality: number; index: number }>();\n  for (const [index, entry] of header.split(\",\").entries()) {\n    const [rawLocale = \"\", ...parameters] = entry.trim().split(\";\");\n    const locale = rawLocale.trim();\n    if (!locale) continue;\n\n    let quality = 1;\n    for (const parameter of parameters) {\n      const [rawName, rawValue] = parameter.trim().split(\"=\", 2);\n      if (rawName?.trim().toLowerCase() !== \"q\") continue;\n      const value = rawValue?.trim() ?? \"\";\n      quality = /^(?:0(?:\\.\\d{0,3})?|1(?:\\.0{0,3})?)$/.test(value) ? Number(value) : 0;\n    }\n\n    const key = locale.toLowerCase();\n    const previous = byRange.get(key);\n    if (!previous || quality > previous.quality) {\n      byRange.set(key, { locale, quality, index: previous?.index ?? index });\n    }\n  }\n\n  const candidates = [...byRange.values()]\n    .filter((candidate) => candidate.quality > 0)\n    .sort((a, b) => b.quality - a.quality || a.index - b.index);\n  const explicitRanges = [...byRange.values()].filter(({ locale }) => locale !== \"*\");\n\n  for (const candidate of candidates) {\n    if (candidate.locale === \"*\") {\n      const wildcardMatch = locales.find(\n        (locale) =>\n          !explicitRanges.some((range) => matchFarmLocale(range.locale, [locale]) !== undefined),\n      );\n      if (wildcardMatch) return wildcardMatch;\n      continue;\n    }\n\n    const locale = matchFarmLocale(candidate.locale, locales);\n    if (locale) return locale;\n  }\n  return undefined;\n}\n\nfunction readCookie(header: string | null, name: string): string | undefined {\n  if (!header) return undefined;\n  for (const part of header.split(\";\")) {\n    const separator = part.indexOf(\"=\");\n    if (separator < 0) continue;\n    let key: string;\n    try {\n      key = decodeURIComponent(part.slice(0, separator).trim());\n    } catch {\n      continue;\n    }\n    if (key !== name) continue;\n    try {\n      return decodeURIComponent(part.slice(separator + 1).trim());\n    } catch {\n      return part.slice(separator + 1).trim();\n    }\n  }\n  return undefined;\n}\n\nfunction isInternalOrApiPath(pathname: string): boolean {\n  return (\n    pathname === \"/api\" ||\n    pathname.startsWith(\"/api/\") ||\n    pathname.startsWith(\"/__farm/\") ||\n    pathname.startsWith(\"/_farm/\")\n  );\n}\n\nfunction capitalize(value: string): string {\n  return value.charAt(0).toUpperCase() + 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