First iteration of a standalone, very lite and naive #nostr client ...

First iteration of a standalone, very lite and naive #nostr client

https://github.com/talvasconcelos/litestr

To make it even more cypherpunk, just copy the code bellow to an HTML file and open it on your browser!

```
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta
name="description"
content="Nostr standalone local client to read notes (WIP)"
/>
<title>Nostr Client</title>

<link
rel="stylesheet"
href="https://cdn.jsdelivr.net/npm/@picocss/pico@2/css/pico.min.css";
/>
</head>

<body>
<header>
<nav class="container-fluid">
<ul>
<li><strong>NOSTR Client</strong></li>
</ul>
<ul>
<li>
<button
class="contrast"
data-target="pubkey-modal"
onclick="toggleModal(event)"
id="add-pubkey"
>
Add Pubkey
</button>
</li>
</ul>
</nav>
</header>
<main class="container">
<section id="notes"></section>
</main>


<dialog id="pubkey-modal">
<article>
<header>
<button
aria-label="Close"
rel="prev"
data-target="pubkey-modal"
onclick="toggleModal(event)"
></button>
<h3>Add you Public Key</h3>
</header>
<input
type="text"
name="pubkey"
placeholder="npub..."
aria-label="Pubkey"
/>
<footer>
<button
role="button"
class="secondary"
data-target="pubkey-modal"
onclick="toggleModal(event)"
>
Cancel</button
><button
autofocus
data-target="pubkey-modal"
onclick="toggleModal(event)"
>
Confirm
</button>
</footer>
</article>
</dialog>

<script src="https://unpkg.com/nostr-tools/lib/nostr.bundle.js"></script>;

<script>
const nostr = NostrTools
const notesSection = document.getElementById('notes')

const pool = new nostr.SimplePool()
let relays = new Set([
'wss://relay.nostr.band/',
'wss://nostr-pub.wellorder.net/',
'wss://relay.damus.io/'
])

// timestamp a year ago
let aYearAgo = 365 * 24 * 60 * 60
let since = parseInt((Date.now() - aYearAgo) / 1000) || 0

let pk = localStorage.getItem('pk') || null
let npub = null
let follows = new Set()
let ev = new Map()
let profiles = new Map()

if (pk) {
pk = sanitizePK(pk)
getInitial().then(async () => {
await getNotes()
subscribeToRelays()
})
}

async function getInitial() {
console.log('Getting initial')
notesSection.ariaBusy = true
let events = await pool.querySync([...relays], {
kinds: [0, 3, 10002],
authors: [pk]
})
events.forEach(event => {
if (event.kind == 0) {
profiles.set(event.id, event)
}
if (event.kind == 3) {
event.tags.forEach(tag => {
if (tag[0] == ['p']) {
follows.add(tag[1])
}
})
}
if (event.kind == 10002) {
event.tags.forEach(tag => {
if (tag[0] == ['r'] && tag[2] != 'write') {
relays.add(tag[1])
}
})
}
})
const _profiles = await pool.querySync([...relays], {
kinds: [0],
authors: [...follows]
})
_profiles.forEach(profile => {
profiles.set(profile.pubkey, profile)
})
notesSection.ariaBusy = false
}

function subscribeToRelays() {
const events = [...ev.values()] || []
const _since =
events.sort((a, b) => b.created_at - a.created_at)[0].created_at || 0
console.log('Since:', since)
pool.subscribeMany(
Array.from(relays),
[
{
authors: Array.from(follows),
kinds: [1],
since: _since
}
],
{
onevent(event) {
console.log('Got an event')
if (event.kind == 1) {
// check if the event is already in the map
if (ev.has(event.id)) return

ev.set(event.id, event)
addNote(event)
}
}
}
)
}

async function getNotes() {
console.log('Getting notes', since)
notesSection.ariaBusy = true
let events = await pool.querySync([...relays], {
kinds: [1],
authors: [...follows],
since
})
events
.sort((a, b) => b.created_at - a.created_at)
.forEach(event => {
ev.set(event.id, event)
})
notesSection.ariaBusy = false
renderNotes()
}

function sanitizePK(pk) {
if (pk.startsWith('npub')) {
npub = pk
let {type, data} = nostr.nip19.decode(npub)
pk = data
} else {
npub = nostr.nip19.npubEncode(pk)
}
follows.add(pk) // follow self
return pk
}

function renderNotes() {
notesSection.innerHTML = ''
ev.forEach(event => {
if (event.kind === 1) {
notesSection.appendChild(noteTemplate(event))
}
})
}

function addNote(event) {
notesSection.prepend(noteTemplate(event))
}

// Modal
const isOpenClass = 'modal-is-open'
const openingClass = 'modal-is-opening'
const closingClass = 'modal-is-closing'
const scrollbarWidthCssVar = '--pico-scrollbar-width'
const animationDuration = 400 // ms
const inputPK = document.getElementsByName('pubkey')[0]
let visibleModal = null

// Toggle modal
const toggleModal = event => {
event.preventDefault()
const modal = document.getElementById(
event.currentTarget.dataset.target
)
if (!modal) return
modal && (modal.open ? closeModal(modal) : openModal(modal))
}

// Open modal
const openModal = modal => {
const {documentElement: html} = document
if (pk) {
inputPK.value = pk
}
const scrollbarWidth = getScrollbarWidth()
if (scrollbarWidth) {
html.style.setProperty(scrollbarWidthCssVar, `${scrollbarWidth}px`)
}
html.classList.add(isOpenClass, openingClass)
setTimeout(() => {
visibleModal = modal
html.classList.remove(openingClass)
}, animationDuration)
modal.showModal()
}

// Close modal
const closeModal = modal => {
visibleModal = null
const {documentElement: html} = document
html.classList.add(closingClass)
if (inputPK.value !== '') {
pk = sanitizePK(inputPK.value)
localStorage.setItem('pk', pk)
inputPK.value = ''
}
setTimeout(() => {
html.classList.remove(closingClass, isOpenClass)
html.style.removeProperty(scrollbarWidthCssVar)
modal.close()
}, animationDuration)
pk &&
Promise.resolve(getInitial()).then(async () => {
await getNotes()
subscribeToRelays()
})
}

// Close with a click outside
document.addEventListener('click', event => {
if (visibleModal === null) return
const modalContent = visibleModal.querySelector('article')
const isClickInside = modalContent.contains(event.target)
!isClickInside && closeModal(visibleModal)
})

// Close with Esc key
document.addEventListener('keydown', event => {
if (event.key === 'Escape' && visibleModal) {
closeModal(visibleModal)
}
})

// Get scrollbar width
const getScrollbarWidth = () => {
const scrollbarWidth =
window.innerWidth - document.documentElement.clientWidth
return scrollbarWidth
}

// Is scrollbar visible
const isScrollbarVisible = () => {
return document.body.scrollHeight > screen.height
}

// Templates
const getProfile = id => {
try {
const profile = profiles.get(id)
if (!profile) return id
console.log('Profile:', profile)
const content = JSON.parse(profile?.content)
console.log('Content:', content)
const name = content?.name || id
return name
} catch (error) {
return id
}
}
const noteTemplate = event => {
let note = document.createElement('article')
note.whiteSpace = 'preserve'
note.innerHTML = `
<header>
${getProfile(event.pubkey)}
</header>
${event.content}
<footer>
<time datetime="${event.created_at}">${new Date(
event.created_at * 1000
).toLocaleString()}</time>
</footer>
`
return note
}
</script>
</body>
</html>
```

talvasconcelos on Nostr: First iteration of a standalone, very lite and naive #nostr client ...