/**
 * CloudFront Function injection code ported from SST's Router component.
 * These are JavaScript code strings that get injected into CloudFront Function handlers.
 */
/**
 * Host-based 301 handling injected at the very top of a generated
 * viewer-request handler (before route matching). Redirects requests whose
 * `Host` is one of the configured redirect hostnames — and, when
 * `cloudfrontUrl: false`, requests arriving via the distribution's default
 * `*.cloudfront.net` domain (the default domain is not knowable inside its
 * own function config before the distribution exists, but only requests
 * served via the default domain ever carry a `.cloudfront.net` Host;
 * alternate domain names never do) — to the canonical hostname with path
 * and query preserved.
 *
 * Relies on `buildHostRedirectResponse` declared by
 * {@link CF_ROUTER_INJECTION} (function declarations hoist within the
 * handler). Returns an empty string when there is nothing to redirect.
 */
export declare const buildHostRedirectInjection: ({ to, hosts, cloudfrontDefault, }: {
    /** Canonical hostname redirected to. */
    to: string | undefined;
    /** Exact redirect hostnames. */
    hosts: string[];
    /** Also redirect the distribution's default `*.cloudfront.net` domain. */
    cloudfrontDefault: boolean;
}) => string;
export declare const CF_ROUTER_INJECTION = "\nasync function routeSite(kvNamespace, metadata) {\n  if (metadata.redirect && metadata.redirect.hosts.indexOf(event.request.headers.host.value) !== -1) {\n    return buildHostRedirectResponse(metadata.redirect.to);\n  }\n\n  var baselessUri = metadata.base\n    ? event.request.uri.replace(metadata.base, \"\")\n    : event.request.uri;\n\n  try {\n    var u = decodeURIComponent(baselessUri);\n    var postfixes = u.endsWith(\"/\")\n      ? [\"index.html\"]\n      : [\"\", \".html\", \"/index.html\"];\n    var v = await Promise.any(postfixes.map(function(p) { return cf.kvs().get(kvNamespace + \":\" + u + p).then(function() { return p; }); }));\n    event.request.uri = metadata.s3.dir + event.request.uri + v;\n    setS3Origin(metadata.s3.domain);\n    return;\n  } catch (e) {}\n\n  if (metadata.s3 && metadata.s3.routes) {\n    for (var i=0, l=metadata.s3.routes.length; i<l; i++) {\n      var route = metadata.s3.routes[i];\n      if (baselessUri.startsWith(route)) {\n        event.request.uri = metadata.s3.dir + event.request.uri;\n        if (event.request.uri.endsWith(\"/\")) {\n          event.request.uri += \"index.html\";\n        } else if (!event.request.uri.split(\"/\").pop().includes(\".\")) {\n          event.request.uri += \"/index.html\";\n        }\n        setS3Origin(metadata.s3.domain);\n        return;\n      }\n    }\n  }\n\n  if (metadata.custom404 && !metadata.errorResponseCode) {\n    event.request.uri = metadata.s3.dir + (metadata.base ? metadata.base : \"\") + metadata.custom404;\n    setS3Origin(metadata.s3.domain);\n    return;\n  }\n\n  if (metadata.s3 && !metadata.servers) {\n    event.request.uri = metadata.s3.dir + event.request.uri;\n    setS3Origin(metadata.s3.domain);\n    return;\n  }\n\n  if (metadata.image && baselessUri.startsWith(metadata.image.route)) {\n    setForwardedHost();\n    if (isRequestHeaderTooLarge()) return buildOversizedHeadersResponse();\n    setUrlOrigin(metadata.image.host, metadata.image.originAccessControlConfig ? { originAccessControlConfig: metadata.image.originAccessControlConfig } : undefined);\n    return;\n  }\n\n  if (metadata.servers) {\n    setForwardedHost();\n    for (var key in event.request.querystring) {\n      if (key.includes(\"/\")) {\n        event.request.querystring[encodeURIComponent(key)] = event.request.querystring[key];\n        delete event.request.querystring[key];\n      }\n    }\n    if (isRequestHeaderTooLarge()) return buildOversizedHeadersResponse();\n    setUrlOrigin(findNearestServer(metadata.servers), metadata.origin);\n  }\n\n  function findNearestServer(servers) {\n    if (servers.length === 1) return servers[0][0];\n    var h = event.request.headers;\n    var lat = h[\"cloudfront-viewer-latitude\"] && h[\"cloudfront-viewer-latitude\"].value;\n    var lon = h[\"cloudfront-viewer-longitude\"] && h[\"cloudfront-viewer-longitude\"].value;\n    if (!lat || !lon) return servers[0][0];\n    return servers.map(function(s) { return { distance: haversineDistance(lat, lon, s[1], s[2]), host: s[0] }; }).sort(function(a,b) { return a.distance - b.distance; })[0].host;\n  }\n\n  function haversineDistance(lat1, lon1, lat2, lon2) {\n    var toRad = function(a) { return a * Math.PI / 180; };\n    var dLat = toRad(lat2 - lat1);\n    var dLon = toRad(lon2 - lon1);\n    var a = Math.sin(dLat/2)*Math.sin(dLat/2) + Math.cos(toRad(lat1))*Math.cos(toRad(lat2))*Math.sin(dLon/2)*Math.sin(dLon/2);\n    return 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));\n  }\n\n  function isRequestHeaderTooLarge() {\n    return getRequestHeaderSize() > 9728;\n  }\n\n  function buildOversizedHeadersResponse() {\n    return {\n      statusCode: 431,\n      statusDescription: \"Request Header Fields Too Large\",\n      headers: { \"cache-control\": { value: \"no-store\" }, \"content-type\": { value: \"text/plain; charset=utf-8\" } },\n      body: { encoding: \"text\", data: \"Request headers are too large. Reduce cookie size and try again.\" },\n    };\n  }\n\n  function getRequestHeaderSize() {\n    var size = 0;\n    for (var key in event.request.headers) {\n      var header = event.request.headers[key];\n      if (header.multiValue) {\n        for (var i=0; i<header.multiValue.length; i++) size += key.length + header.multiValue[i].value.length + 4;\n      } else if (header.value) {\n        size += key.length + header.value.length + 4;\n      }\n    }\n    var cookies = [];\n    for (var key in event.request.cookies) {\n      var cookie = event.request.cookies[key];\n      if (cookie.multiValue) {\n        for (var i=0; i<cookie.multiValue.length; i++) cookies.push(key + \"=\" + cookie.multiValue[i].value);\n      } else {\n        cookies.push(key + \"=\" + cookie.value);\n      }\n    }\n    if (cookies.length) size += 10 + cookies.join(\"; \").length;\n    return size;\n  }\n}\n\nfunction setForwardedHost() {\n  event.request.headers[\"x-forwarded-host\"] = event.request.headers.host;\n}\n\nfunction serializeQuerystring() {\n  var parts = [];\n  for (var key in event.request.querystring) {\n    var q = event.request.querystring[key];\n    if (q.multiValue) {\n      for (var i = 0; i < q.multiValue.length; i++) parts.push(key + \"=\" + q.multiValue[i].value);\n    } else {\n      parts.push(q.value === \"\" ? key : key + \"=\" + q.value);\n    }\n  }\n  return parts.length ? \"?\" + parts.join(\"&\") : \"\";\n}\n\nfunction buildHostRedirectResponse(toHost) {\n  return {\n    statusCode: 301,\n    statusDescription: \"Moved Permanently\",\n    headers: {\n      location: { value: \"https://\" + toHost + event.request.uri + serializeQuerystring() },\n      \"cache-control\": { value: \"no-store\" },\n    },\n  };\n}\n\nfunction setUrlOrigin(urlHost, override) {\n  setForwardedHost();\n  var origin = {\n    domainName: urlHost,\n    customOriginConfig: {\n      port: 443,\n      protocol: \"https\",\n      sslProtocols: [\"TLSv1.2\"],\n    },\n    originAccessControlConfig: {\n      enabled: false,\n    }\n  };\n  override = override || {};\n  if (override.protocol === \"http\") delete origin.customOriginConfig;\n  if (override.connectionAttempts) origin.connectionAttempts = override.connectionAttempts;\n  if (override.timeouts) origin.timeouts = override.timeouts;\n  if (override.originAccessControlConfig) origin.originAccessControlConfig = override.originAccessControlConfig;\n  cf.updateRequestOrigin(origin);\n}\n\nfunction setS3Origin(s3Domain, override) {\n  delete event.request.headers[\"Cookies\"];\n  delete event.request.headers[\"cookies\"];\n  delete event.request.cookies;\n  var origin = {\n    domainName: s3Domain,\n    originAccessControlConfig: {\n      enabled: true,\n      signingBehavior: \"always\",\n      signingProtocol: \"sigv4\",\n      originType: \"s3\",\n    }\n  };\n  override = override || {};\n  if (override.connectionAttempts) origin.connectionAttempts = override.connectionAttempts;\n  if (override.timeouts) origin.timeouts = override.timeouts;\n  cf.updateRequestOrigin(origin);\n}";
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