Split web things into subdirectories

1 files changed, 235 insertions, 0 deletions

diff --git a/web/src/index.js b/web/src/index.js
new file mode 100644
index 0000000..815f321
--- /dev/null
+++ b/web/src/index.js
@@ -0,0 +1,235 @@
+// 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 "../lib/htm/preact.js"
+import { Spinner } from "./spinner.js"
+import * as widgetAPI from "./widget-api.js"
+import * as frequent from "./frequently-used.js"
+
+// 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`
+
+// We need to detect iOS webkit because it has a bug related to scrolling non-fixed divs
+// This is also used to fix scrolling to sections on Element iOS
+const isMobileSafari = navigator.userAgent.match(/(iPod|iPhone|iPad)/) && navigator.userAgent.match(/AppleWebKit/)
+
+class App extends Component {
+	constructor(props) {
+		super(props)
+		this.state = {
+			packs: [],
+			loading: true,
+			error: null,
+			frequentlyUsed: {
+				id: "frequently-used",
+				title: "Frequently used",
+				stickerIDs: frequent.get(),
+				stickers: [],
+			},
+		}
+		this.stickersByID = new Map(JSON.parse(localStorage.mauFrequentlyUsedStickerCache || "[]"))
+		this.state.frequentlyUsed.stickers = this._getStickersByID(this.state.frequentlyUsed.stickerIDs)
+		this.imageObserver = null
+		this.packListRef = null
+		this.navRef = null
+		this.sendSticker = this.sendSticker.bind(this)
+		this.navScroll = this.navScroll.bind(this)
+		this.reloadPacks = this.reloadPacks.bind(this)
+	}
+
+	_getStickersByID(ids) {
+		return ids.map(id => this.stickersByID.get(id)).filter(sticker => !!sticker)
+	}
+
+	updateFrequentlyUsed() {
+		const stickerIDs = frequent.get()
+		const stickers = this._getStickersByID(stickerIDs)
+		this.setState({
+			frequentlyUsed: {
+				...this.state.frequentlyUsed,
+				stickerIDs,
+				stickers,
+			},
+		})
+		localStorage.mauFrequentlyUsedStickerCache = JSON.stringify(stickers.map(sticker => [sticker.id, sticker]))
+	}
+
+	reloadPacks() {
+		this.imageObserver.disconnect()
+		this.sectionObserver.disconnect()
+		this.setState({ packs: [] })
+		this._loadPacks(true)
+	}
+
+	_loadPacks(disableCache = false) {
+		const cache = disableCache ? "no-cache" : undefined
+		fetch(`${PACKS_BASE_URL}/index.json`, { cache }).then(async indexRes => {
+			if (indexRes.status >= 400) {
+				this.setState({
+					loading: false,
+					error: indexRes.status !== 404 ? indexRes.statusText : null,
+				})
+				return
+			}
+			const indexData = await indexRes.json()
+			HOMESERVER_URL = indexData.homeserver_url || HOMESERVER_URL
+			// TODO only load pack metadata when scrolled into view?
+			for (const packFile of indexData.packs) {
+				const packRes = await fetch(`${PACKS_BASE_URL}/${packFile}`, { cache })
+				const packData = await packRes.json()
+				for (const sticker of packData.stickers) {
+					this.stickersByID.set(sticker.id, sticker)
+				}
+				this.setState({
+					packs: [...this.state.packs, packData],
+					loading: false,
+				})
+			}
+			this.updateFrequentlyUsed()
+		}, error => this.setState({ loading: false, error }))
+	}
+
+	componentDidMount() {
+		this._loadPacks()
+		this.imageObserver = new IntersectionObserver(this.observeImageIntersections, {
+			rootMargin: "100px",
+		})
+		this.sectionObserver = new IntersectionObserver(this.observeSectionIntersections)
+	}
+
+	observeImageIntersections(intersections) {
+		for (const entry of intersections) {
+			const img = entry.target.children.item(0)
+			if (entry.isIntersecting) {
+				img.setAttribute("src", img.getAttribute("data-src"))
+				img.classList.add("visible")
+			} else {
+				img.removeAttribute("src")
+				img.classList.remove("visible")
+			}
+		}
+	}
+
+	observeSectionIntersections(intersections) {
+		for (const entry of intersections) {
+			const packID = entry.target.getAttribute("data-pack-id")
+			const navElement = document.getElementById(`nav-${packID}`)
+			if (entry.isIntersecting) {
+				navElement.classList.add("visible")
+			} else {
+				navElement.classList.remove("visible")
+			}
+		}
+	}
+
+	componentDidUpdate() {
+		if (this.packListRef === null) {
+			return
+		}
+		for (const elem of this.packListRef.getElementsByClassName("sticker")) {
+			this.imageObserver.observe(elem)
+		}
+		for (const elem of this.packListRef.children) {
+			this.sectionObserver.observe(elem)
+		}
+	}
+
+	componentWillUnmount() {
+		this.imageObserver.disconnect()
+		this.sectionObserver.disconnect()
+	}
+
+	sendSticker(evt) {
+		const id = evt.currentTarget.getAttribute("data-sticker-id")
+		const sticker = this.stickersByID.get(id)
+		frequent.add(id)
+		this.updateFrequentlyUsed()
+		widgetAPI.sendSticker(sticker)
+	}
+
+	navScroll(evt) {
+		this.navRef.scrollLeft += evt.deltaY * 12
+	}
+
+	render() {
+		if (this.state.loading) {
+			return html`<main class="spinner"><${Spinner} size=${80} green /></main>`
+		} else if (this.state.error) {
+			return html`<main class="error">
+				<h1>Failed to load packs</h1>
+				<p>${this.state.error}</p>
+			</main>`
+		} else if (this.state.packs.length === 0) {
+			return html`<main class="empty"><h1>No packs found 😿</h1></main>`
+		}
+		return html`<main class="has-content">
+			<nav onWheel=${this.navScroll} ref=${elem => this.navRef = elem}>
+				<${NavBarItem} pack=${this.state.frequentlyUsed} iconOverride="res/recent.svg" altOverride="🕓️" />
+				${this.state.packs.map(pack => html`<${NavBarItem} id=${pack.id} pack=${pack}/>`)}
+				<${NavBarItem} pack=${{ id: "settings", title: "Settings" }} iconOverride="res/settings.svg" altOverride="⚙️️" />
+			</nav>
+			<div class="pack-list ${isMobileSafari ? "ios-safari-hack" : ""}" ref=${elem => this.packListRef = elem}>
+				<${Pack} pack=${this.state.frequentlyUsed} send=${this.sendSticker} />
+				${this.state.packs.map(pack => html`<${Pack} id=${pack.id} pack=${pack} send=${this.sendSticker} />`)}
+				<${Settings} app=${this}/>
+			</div>
+		</main>`
+	}
+}
+
+const Settings = ({ app }) => html`
+	<section class="stickerpack settings" id="pack-settings" data-pack-id="settings">
+		<h1>Settings</h1>
+		<div class="settings-list">
+			<button onClick=${app.reloadPacks}>Reload</button>
+		</div>
+	</section>
+`
+
+// By default we just let the browser handle scrolling to sections, but webviews on Element iOS
+// open the link in the browser instead of just scrolling there, so we need to scroll manually:
+const scrollToSection = (evt, id) => {
+	const pack = document.getElementById(`pack-${id}`)
+	pack.scrollIntoView({ block: "start", behavior: "instant" })
+	evt.preventDefault()
+}
+
+const NavBarItem = ({ pack, iconOverride = null, altOverride = null }) => html`
+	<a href="#pack-${pack.id}" id="nav-${pack.id}" data-pack-id=${pack.id} title=${pack.title}
+	   onClick=${isMobileSafari ? (evt => scrollToSection(evt, pack.id)) : undefined}>
+		<div class="sticker ${iconOverride ? "icon" : ""}">
+			${iconOverride ? html`
+				<img src=${iconOverride} alt=${altOverride} class="visible"/>
+			` : html`
+				<img src=${makeThumbnailURL(pack.stickers[0].url)}
+					alt=${pack.stickers[0].body} class="visible" />
+			`}
+		</div>
+	</a>
+`
+
+const Pack = ({ pack, send }) => html`
+	<section class="stickerpack" id="pack-${pack.id}" data-pack-id=${pack.id}>
+		<h1>${pack.title}</h1>
+		<div class="sticker-list">
+			${pack.stickers.map(sticker => html`
+				<${Sticker} key=${sticker.id} content=${sticker} send=${send}/>
+			`)}
+		</div>
+	</section>
+`
+
+const Sticker = ({ content, send }) => html`
+	<div class="sticker" onClick=${send} data-sticker-id=${content.id}>
+		<img data-src=${makeThumbnailURL(content.url)} alt=${content.body} />
+	</div>
+`
+
+render(html`<${App} />`, document.body)