import React from 'react'import Router from 'next/router'import { mutate } from 'swr'import ourbigbook from 'ourbigbook';import { webApi } from 'front/api'import { AUTH_COOKIE_NAME } from 'front/js'import CustomLink from 'front/CustomLink'import routes from 'front/routes'import { ArticleType } from 'front/types/ArticleType'import { IssueType } from 'front/types/IssueType'export const AUTH_LOCAL_STORAGE_NAME = 'user'export const LOGIN_ACTION = 'Sign in'export const REGISTER_ACTION = 'Sign up'export function capitalize(s) {  return s[0].toUpperCase() + s.slice(1)}export function decapitalize(s) {  return s[0].toLowerCase() + s.slice(1)}export function ArticleBy(  { article, newTab=false }:  { article?: ArticleType }) {  const inner = <>    "<span      className="comment-body ourbigbook-title"      // BUG: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')// dangerouslySetInnerHTML={{ __html: article.titleRender }}// FIXED:     />" by { article.author.displayName }  </>  const href = routes.article(article.slug)  if (newTab) {    return <a href={href} target="_blank">{inner}</a>  } else {    return <CustomLink href={href}>{inner}</CustomLink>  }}export function IssueBy(  { article }:  { article?: ArticleType }) {  return <CustomLink href={routes.article(article.slug)}>    "<span      className="comment-body ourbigbook-title"      dangerouslySetInnerHTML={{ __html: article.titleRender }}    />" by { article.author.displayName }  </CustomLink>}export function DiscussionAbout(  { article, issue }:  { article?: ArticleType; issue?: IssueType }) {  const inner = <>      <IssueIcon />{' '}      Discussion{issue ? ` #${issue.number}` : ''}:{' '}      <ArticleBy {...{article, issue}} />    </>  if (issue) {    return <div className="h1">{ inner }</div>  } else {    return <h1>{ inner }</h1>  }}// Icons.export function Icon(cls, title, opts) {  const showTitle = opts.title === undefined ? true : opts.title  return <i className={cls} title={showTitle ? title : undefined } />}export function ArticleIcon(opts) {  return Icon("ion-ios-book", "Article", opts)}export function CancelIcon(opts) {  return Icon("ion-close", "Cancel", opts)}export function EditArticleIcon(opts) {  return Icon("ion-edit", "Edit", opts)}export function ErrorIcon(opts) {  return Icon("ion-close", "Edit", opts)}export function HelpIcon(opts) {  return Icon("ion-help-circled", "Help", opts)}export function IssueIcon(opts) {  return Icon("ion-ios-chatbubble", "Discussion", opts)}export function NewArticleIcon(opts) {  return Icon("ion-plus", "New", opts)}export function SeeIcon(opts) {  return Icon("ion-eye", "View", opts)}export function TimeIcon(opts) {  return Icon("ion-android-time", undefined, opts)}export function TopicIcon(opts) {  return Icon("ion-ios-people", "Topic", opts)}export function UserIcon(opts) {  return Icon("ion-ios-person", "User", opts)}export function SignupOrLogin(  { to }:  { to: string }) {  return <>    <CustomLink href={routes.userNew()}>      {REGISTER_ACTION}    </CustomLink>    {' '}or{' '}    <CustomLink href={routes.userLogin()}>      {decapitalize(LOGIN_ACTION)}    </CustomLink>    {' '}{to}.  </>}export function disableButton(btn, msg) {  btn.setAttribute('disabled', '')  btn.setAttribute('title', msg)  btn.classList.add('disabled')}export function enableButton(btn, msgGiven) {  btn.removeAttribute('disabled')  if (msgGiven) {    btn.removeAttribute('title')  }  btn.classList.remove('disabled')}export function slugFromArray(arr, { username }: { username?: boolean } = {}) {  if (username === undefined) {    username = true  }  const start = username ? 0 : 1  return arr.slice(start).join(ourbigbook.Macro.HEADER_SCOPE_SEPARATOR)}export function slugFromRouter(router, opts={}) {  let arr = router.query.slug  if (!arr) {    return router.query.uid  }  return slugFromArray(arr, opts)}export const AppContext = React.createContext<{  title: string  setTitle: React.Dispatch<any> | undefined}>({  title: '',  setTitle: undefined,});// Global state.export const AppContextProvider = ({ children }) => {  const [title, setTitle] = React.useState()  return <AppContext.Provider value={{    title, setTitle,  }}>    {children}  </AppContext.Provider>};export function useCtrlEnterSubmit(handleSubmit) {  React.useEffect(() => {    function ctrlEnterListener(e) {      if (e.code === 'Enter' && e.ctrlKey) {        handleSubmit(e)      }    }    document.addEventListener('keydown', ctrlEnterListener);    return () => {      document.removeEventListener('keydown', ctrlEnterListener);    };  }, [handleSubmit]);}export function useEEdit(canEdit, slug) {  React.useEffect(() => {    function listener(e) {      if (e.code === 'KeyE') {        if (canEdit) {          Router.push(routes.articleEdit(slug))        }      }    }    if (slug !== undefined) {      document.addEventListener('keydown', listener);      return () => {        document.removeEventListener('keydown', listener);      }    }  }, [canEdit, slug]);}// https://stackoverflow.com/questions/4825683/how-do-i-create-and-read-a-value-from-cookie/38699214#38699214export function setCookie(name, value, days?: number, path = '/') {  let delta  if (days === undefined) {    delta = Number.MAX_SAFE_INTEGER  } else {    delta = days * 864e5  }  const expires = new Date(Date.now() + delta).toUTCString()  document.cookie = `${name}=${encodeURIComponent(    value  )};expires=${expires};path=${path}`}export function setCookies(cookieDict, days, path = '/') {  for (let key in cookieDict) {    setCookie(key, cookieDict[key], days, path)  }}export function getCookie(name) {  return getCookieFromString(document.cookie, name)}export function getCookieFromReq(req, name) {  const cookie = req.headers.cookie  if (cookie) {    return getCookieFromString(cookie, name)  } else {    return null  }}export function getCookieFromString(s, name) {  return getCookiesFromString(s)[name]}// https://stackoverflow.com/questions/5047346/converting-strings-like-document-cookie-to-objectsexport function getCookiesFromString(s) {  return s.split('; ').reduce((prev, current) => {    const [name, ...value] = current.split('=')    prev[name] = value.join('=')    return prev  }, {})}export function deleteCookie(name, path = '/') {  setCookie(name, '', -1, path)}export async function setupUserLocalStorage(user, setErrors?) {  // We fetch from /profiles/:username again because the return from /users/login above  // does not contain the image placeholder.  const { data: userData, status: userStatus } = await webApi.user(    user.username  )  user.effectiveImage = userData.effectiveImage  window.localStorage.setItem(    AUTH_LOCAL_STORAGE_NAME,    JSON.stringify(user)  );  setCookie(AUTH_COOKIE_NAME, user.token)  mutate(AUTH_COOKIE_NAME, user.token)  mutate(AUTH_LOCAL_STORAGE_NAME, user);}