btrc-hub/frontend/src/components/PostEmbed.tsx

import { useState } from 'react'
import YoutubeEmbed from 'react-youtube'

import NicoViewer from '@/components/NicoViewer'
import TwitterEmbed from '@/components/TwitterEmbed'

import type { FC } from 'react'

import type { Post } from '@/types'

type Props = { post: Post }


export default (({ post }: Props) => {
  const url = new URL (post.url)

  switch (url.hostname.split ('.').slice (-2).join ('.'))
  {
  case 'nicovideo.jp':
    {
      const [videoId] = url.pathname.match (/(?<=\/watch\/)[a-zA-Z0-9]+?(?=\/|$)/)!
      return <NicoViewer id={videoId} width={640} height={360}/>
    }
  case 'twitter.com':
  case 'x.com':
    const [userId] = url.pathname.match (/(?<=\/)[^\/]+?(?=\/|$|\?)/)!
    const [statusId] = url.pathname.match (/(?<=\/status\/)\d+?(?=\/|$|\?)/)!
    return <TwitterEmbed userId={userId} statusId={statusId}/>
  case 'youtube.com':
    {
      const videoId = url.searchParams.get ('v')!
      return (
	  <YoutubeEmbed videoId={videoId} opts={{ playerVars: {
	      playsinline:  1,
	      autoplay:     1,
	      mute:         0,
	      loop:         1,
	      width:        '640',
	      height:       '360' } }}/>)
    }
  }

  const [framed, setFramed] = useState (false)

  return (
      <>
	{framed
	 ? (
	    <iframe
		src={post.url}
		title={post.title || post.url}
		width={640}
		height={360}/>)
	 : (
	    <div>
	      <a href="#" onClick={e => {
		e.preventDefault ()
		setFramed (confirm ('未確認の外部ページを表示します。\n'
				    + '悪意のあるスクリプトが実行される可能性があります。\n'
				    + '表示しますか?'))
		return
	      }}>
		外部ページを表示
	      </a>
	    </div>)}
      </>)
}) satisfies FC<Props>