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// Copyright 2019-2020 Yusuke Sakurai. All rights reserved. MIT license.import { toIMF } from "./vendor/https/deno.land/std/datetime/mod.ts";
export interface SetCookieOpts {  expires?: Date;  maxAge?: number;  domain?: string;  path?: string;  secure?: boolean;  httpOnly?: boolean;  sameSite?: "Strict" | "Lax" | "None";}
export interface Cookie extends SetCookieOpts {  name: string;  value: string;}
export function parseCookie(header: string): Map<string, string> {  const query = decodeURIComponent(header)    .split(";")    .map((v) => v.trim())    .join("&");  return new Map(new URLSearchParams(query).entries());}
export function parseSetCookie(header: string): Cookie {  const m = header.match(/^(.+?)=(.+?);(.+?)$/);  if (!m) {    throw new Error("invalid cookie header");  }  const [_, name, value, optStr] = m;  const optMap = new Headers(    optStr.split(";").map((i) => {      const [k, v] = i.trim().split("=");      return [k, v] as [string, string];    }),  );  const domain = optMap.get("Domain") || undefined;  const path = optMap.get("Path") || undefined;  const secure = optMap.has("Secure") || undefined;  const httpOnly = optMap.has("HttpOnly") || undefined;  const sameSite = optMap.get("SameSite") || undefined;  let expires: Date | undefined;  if (optMap.has("Expires")) {    const e = optMap.get("Expires")!;    expires = new Date(e);  }  let maxAge: number | undefined;  if (optMap.has("Max-Age")) {    const m = optMap.get("Max-Age")!;    maxAge = parseInt(m);  }  if (    typeof sameSite === "string" &&    sameSite !== "Lax" &&    sameSite !== "Strict"  ) {    throw new Error("sameSite is invalid");  }  return {    name,    value,    expires,    maxAge,    domain,    path,    secure,    httpOnly,    sameSite,  };}
export function cookieToString(  name: string,  value: string,  opts: SetCookieOpts = {},) {  const out: string[] = [];  out.push(`${encodeURIComponent(name)}=${encodeURIComponent(value)}`);  if (opts.expires != null) {    out.push("Expires=" + toIMF(opts.expires));  }  if (opts.maxAge != null) {    if (!Number.isInteger(opts.maxAge) || opts.maxAge <= 0) {      throw new TypeError("maxAge must be integer and > 0");    }    out.push("Max-Age=" + opts.maxAge);  }  if (opts.domain != null) {    out.push("Domain=" + opts.domain);  }  if (opts.path != null) {    out.push("Path=" + opts.path);  }  if (opts.secure != null) {    out.push("Secure");  }  if (opts.httpOnly != null) {    out.push("HttpOnly");  }  if (opts.sameSite != null) {    out.push("SameSite=" + opts.sameSite);  }  return out.join("; ");}
export interface CookieSetter {  setCookie(name: string, value: string, opts?: SetCookieOpts): void;  clearCookie(name: string, opts?: { path?: string }): void;}
export function cookieSetter(responseHeaders: Headers): CookieSetter {  function clearCookie(name: string, opts: { path?: string } = {}) {    const out: string[] = [];    out.push(`${name}=`);    if (opts.path) {      out.push("Path=" + opts.path);    }    // Set past date    out.push("Expires=" + toIMF(new Date(0)));    const v = out.join("; ");    responseHeaders.append("Set-Cookie", v);  }  function setCookie(name: string, value: string, opts: SetCookieOpts = {}) {    responseHeaders.append("Set-Cookie", cookieToString(name, value, opts));  }  return { setCookie, clearCookie };}