154 lines
4.1 KiB
TypeScript
154 lines
4.1 KiB
TypeScript
import { AddressPointer, EventPointer, ProfilePointer, decode } from './nip19.ts'
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export type Block =
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type: 'text'
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text: string
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}
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| {
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type: 'reference'
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pointer: ProfilePointer | AddressPointer | EventPointer
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}
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| {
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type: 'url'
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url: string
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}
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| {
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type: 'relay'
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url: string
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}
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| {
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type: 'image'
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url: string
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}
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| {
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type: 'video'
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url: string
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}
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| {
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type: 'audio'
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url: string
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}
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const noCharacter = /\W/m
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const noURLCharacter = /\W |\W$|$|,| /m
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export function* parse(content: string): Iterable<Block> {
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const max = content.length
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let prevIndex = 0
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let index = 0
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while (index < max) {
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let u = content.indexOf(':', index)
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if (u === -1) {
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// reached end
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break
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}
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if (content.substring(u - 5, u) === 'nostr') {
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const m = content.substring(u + 60).match(noCharacter)
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const end = m ? u + 60 + m.index! : max
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try {
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let pointer: ProfilePointer | AddressPointer | EventPointer
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let { data, type } = decode(content.substring(u + 1, end))
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switch (type) {
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case 'npub':
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pointer = { pubkey: data } as ProfilePointer
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break
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case 'nsec':
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case 'note':
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// ignore this, treat it as not a valid uri
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index = end + 1
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continue
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default:
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pointer = data as any
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}
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if (prevIndex !== u - 5) {
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yield { type: 'text', text: content.substring(prevIndex, u - 5) }
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}
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yield { type: 'reference', pointer }
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index = end
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prevIndex = index
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continue
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} catch (_err) {
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// ignore this, not a valid nostr uri
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index = u + 1
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continue
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}
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} else if (content.substring(u - 5, u) === 'https' || content.substring(u - 4, u) === 'http') {
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const m = content.substring(u + 4).match(noURLCharacter)
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const end = m ? u + 4 + m.index! : max
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const prefixLen = content[u - 1] === 's' ? 5 : 4
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try {
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let url = new URL(content.substring(u - prefixLen, end))
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if (url.hostname.indexOf('.') === -1) {
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throw new Error('invalid url')
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}
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if (prevIndex !== u - prefixLen) {
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yield { type: 'text', text: content.substring(prevIndex, u - prefixLen) }
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}
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if (/\.(png|jpe?g|gif|webp)$/i.test(url.pathname)) {
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yield { type: 'image', url: url.toString() }
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index = end
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prevIndex = index
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continue
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}
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if (/\.(mp4|avi|webm|mkv)$/i.test(url.pathname)) {
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yield { type: 'video', url: url.toString() }
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index = end
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prevIndex = index
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continue
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}
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if (/\.(mp3|aac|ogg|opus)$/i.test(url.pathname)) {
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yield { type: 'audio', url: url.toString() }
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index = end
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prevIndex = index
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continue
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}
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yield { type: 'url', url: url.toString() }
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index = end
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prevIndex = index
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continue
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} catch (_err) {
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// ignore this, not a valid url
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index = end + 1
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continue
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}
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} else if (content.substring(u - 3, u) === 'wss' || content.substring(u - 2, u) === 'ws') {
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const m = content.substring(u + 4).match(noURLCharacter)
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const end = m ? u + 4 + m.index! : max
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const prefixLen = content[u - 1] === 's' ? 3 : 2
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try {
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let url = new URL(content.substring(u - prefixLen, end))
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if (url.hostname.indexOf('.') === -1) {
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throw new Error('invalid ws url')
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}
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if (prevIndex !== u - prefixLen) {
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yield { type: 'text', text: content.substring(prevIndex, u - prefixLen) }
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}
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yield { type: 'relay', url: url.toString() }
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index = end
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prevIndex = index
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continue
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} catch (_err) {
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// ignore this, not a valid url
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index = end + 1
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continue
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}
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} else {
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// ignore this, it is nothing
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index = u + 1
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continue
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}
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}
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if (prevIndex !== max) {
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yield { type: 'text', text: content.substring(prevIndex) }
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}
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}
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