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1 files changed, 175 insertions, 0 deletions

diff --git a/web/index.js b/web/index.js
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+++ b/web/index.js
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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)