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// Copyright (c) 2020 Tulir Asokan
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
import { html, render, Component } from "https://unpkg.com/htm/preact/index.mjs?module"
// The base URL for fetching packs. The app will first fetch ${PACK_BASE_URL}/index.json,
// then ${PACK_BASE_URL}/${packFile} for each packFile in the packs object of the index.json file.
const PACKS_BASE_URL = "packs"
// This is updated from packs/index.json
let HOMESERVER_URL = "https://matrix-client.matrix.org"
const makeThumbnailURL = mxc => `${HOMESERVER_URL}/_matrix/media/r0/thumbnail/${mxc.substr(6)}?height=128&width=128&method=scale`
class App extends Component {
constructor(props) {
super(props)
this.state = {
packs: [],
loading: true,
error: null,
}
this.observer = null
}
observeIntersection = intersections => {
for (const entry of intersections) {
const img = entry.target.children.item(0)
if (entry.isIntersecting) {
img.setAttribute("src", img.getAttribute("data-src"))
img.classList.add("visible")
} else {
img.removeAttribute("src")
img.classList.remove("visible")
}
}
}
componentDidMount() {
fetch(`${PACKS_BASE_URL}/index.json`).then(async indexRes => {
if (indexRes.status >= 400) {
this.setState({
loading: false,
error: indexRes.status !== 404 ? indexRes.statusText : null,
})
return
}
const indexData = await indexRes.json()
HOMESERVER_URL = indexData.homeserver_url || HOMESERVER_URL
// TODO only load pack metadata when scrolled into view?
for (const packFile of indexData.packs) {
const packRes = await fetch(`${PACKS_BASE_URL}/${packFile}`)
const packData = await packRes.json()
this.setState({
packs: [...this.state.packs, packData],
loading: false,
})
}
}, error => this.setState({ loading: false, error }))
this.observer = new IntersectionObserver(this.observeIntersection, {
rootMargin: "100px",
threshold: 0,
})
}
componentDidUpdate() {
for (const elem of document.getElementsByClassName("sticker")) {
this.observer.observe(elem)
}
}
componentWillUnmount() {
this.observer.disconnect()
}
render() {
if (this.state.loading) {
return html`<div class="main spinner"><${Spinner} size=${80} green /></div>`
} else if (this.state.error) {
return html`<div class="main error">
<h1>Failed to load packs</h1>
<p>${this.state.error}</p>
</div>`
} else if (this.state.packs.length === 0) {
return html`<div class="main empty"><h1>No packs found :(</h1></div>`
}
return html`<div class="main pack-list">
${this.state.packs.map(pack => html`<${Pack} id=${pack.id} ...${pack}/>`)}
</div>`
}
}
const Spinner = ({ size = 40, noCenter = false, noMargin = false, green = false }) => {
let margin = 0
if (!isNaN(+size)) {
size = +size
margin = noMargin ? 0 : `${Math.round(size / 6)}px`
size = `${size}px`
}
const noInnerMargin = !noCenter || !margin
const comp = html`
<div style="width: ${size}; height: ${size}; margin: ${noInnerMargin ? 0 : margin} 0;"
class="sk-chase ${green && "green"}">
<div class="sk-chase-dot" />
<div class="sk-chase-dot" />
<div class="sk-chase-dot" />
<div class="sk-chase-dot" />
<div class="sk-chase-dot" />
<div class="sk-chase-dot" />
</div>
`
if (!noCenter) {
return html`<div style="margin: ${margin} 0;" class="sk-center-wrapper">${comp}</div>`
}
return comp
}
const Pack = ({ title, stickers }) => html`<div class="stickerpack">
<h1>${title}</h1>
<div class="sticker-list">
${stickers.map(sticker => html`
<${Sticker} key=${sticker["net.maunium.telegram.sticker"].id} content=${sticker}/>
`)}
</div>
</div>`
const Sticker = ({ content }) => html`<div class="sticker" onClick=${() => sendSticker(content)}>
<img data-src=${makeThumbnailURL(content.url)} alt=${content.body} />
</div>`
function sendSticker(content) {
window.parent.postMessage({
api: "fromWidget",
action: "m.sticker",
requestId: `sticker-${Date.now()}`,
widgetId,
data: {
name: content.body,
content,
},
}, "*")
}
let widgetId = null
window.onmessage = event => {
if (!window.parent || !event.data) {
return
}
const request = event.data
if (!request.requestId || !request.widgetId || !request.action || request.api !== "toWidget") {
return
}
if (widgetId) {
if (widgetId !== request.widgetId) {
return
}
} else {
widgetId = request.widgetId
}
window.parent.postMessage({
...request,
response: request.action === "capabilities" ? {
capabilities: ["m.sticker"],
} : {
error: { message: "Action not supported" },
},
}, event.origin)
}
render(html`<${App} />`, document.body)
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