degmods.com/src/components/Notes/NoteRender.tsx

import { NDKKind } from '@nostr-dev-kit/ndk'
import { ProfileLink } from 'components/ProfileSection'
import { nip19 } from 'nostr-tools'
import { useMemo } from 'react'
import { Fragment } from 'react/jsx-runtime'
import { BlogPreview } from './internal/BlogPreview'
import { ModPreview } from './internal/ModPreview'
import { NoteWrapper } from './internal/NoteWrapper'
import {
  isValidAudioUrl,
  isValidImageUrl,
  isValidUrl,
  isValidVideoUrl
} from 'utils'

interface NoteRenderProps {
  content: string
}
const link =
  /(?:https?:\/\/|www\.)(?:[a-zA-Z0-9.-]+\.[a-zA-Z]+(?::\d+)?)(?:[/?#][\p{L}\p{N}\p{M}&.-/?=#\-@%+_,:!~*]*)?/u
const nostrMention =
  /(?:nostr:|@)?(?:npub|note|nprofile|nevent|naddr)1[qpzry9x8gf2tvdw0s3jn54khce6mua7l]{58,}/i
const nostrEntity =
  /(npub|note|nprofile|nevent|naddr)1[qpzry9x8gf2tvdw0s3jn54khce6mua7l]{58,}/i
const nostrNip05Mention = /(?:nostr:|@)[^\s]{1,64}@[^\s]+\.[^\s]{2,}/i
const nip05Entity = /(?:nostr:|@)([^\s]{1,64}@[^\s]+\.[^\s]{2,})/i

export const NoteRender = ({ content }: NoteRenderProps) => {
  const _content = useMemo(() => {
    if (!content) return

    const parts = content.split(
      new RegExp(
        `(${link.source})|(${nostrMention.source})|(${nostrNip05Mention.source})`,
        'gui'
      )
    )

    const _parts = parts
      .filter((p) => typeof p !== 'undefined')
      .map((part, index) => {
        const key = `${index}-${part}`
        if (link.test(part)) {
          const [href] = part.match(link) || []

          if (href && isValidUrl(href)) {
            if (isValidImageUrl(href)) {
              // Image
              return (
                <img key={key} className='imgFeedRender' src={href} alt='' />
              )
            } else if (isValidVideoUrl(href)) {
              // Video
              return (
                <video
                  key={key}
                  className='videoFeedRender'
                  src={href}
                  controls
                />
              )
            } else if (isValidAudioUrl(href)) {
              return <audio key={key} src={href} controls />
            }
          }

          // Link
          return (
            <a key={key} target='_blank' href={href}>
              {href}
            </a>
          )
        } else if (nostrMention.test(part)) {
          const [encoded] = part.match(nostrEntity) || []

          if (!encoded) return part

          try {
            const decoded = nip19.decode(encoded)

            switch (decoded.type) {
              case 'nprofile':
                return <ProfileLink key={key} pubkey={decoded.data.pubkey} />
              case 'npub':
                return <ProfileLink key={key} pubkey={decoded.data} />
              case 'note':
                return <NoteWrapper key={key} noteEntity={encoded} />
              case 'nevent':
                return <NoteWrapper key={key} noteEntity={encoded} />
              case 'naddr':
                return (
                  <Fragment key={key}>
                    {handleNaddr(decoded.data, part)}
                  </Fragment>
                )

              default:
                return part
            }
          } catch (error) {
            return part
          }
        } else if (nostrNip05Mention.test(part)) {
          const matches = nip05Entity.exec(part) || []
          const nip05 = matches?.[1] || part
          return <ProfileLink key={key} nip05={nip05} fallback={nip05} />
        } else {
          return <Fragment key={key}>{part}</Fragment>
        }
      })
    return _parts
  }, [content])

  return _content
}

function handleNaddr(data: nip19.AddressPointer, original: string) {
  const { kind } = data

  if (kind === NDKKind.Article) {
    return <BlogPreview {...data} original={original} />
  } else if (kind === NDKKind.Classified) {
    return <ModPreview {...data} original={original} />
  } else {
    return <>{original}</>
  }
}