114 lines
3 KiB
TypeScript
114 lines
3 KiB
TypeScript
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// Copyright 2024 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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import { readFile } from 'node:fs/promises';
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import { join } from 'node:path';
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import * as z from 'zod';
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import { protocol } from 'electron';
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import LRU from 'lru-cache';
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import type { OptionalResourceService } from './OptionalResourceService';
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import { SignalService as Proto } from '../ts/protobuf';
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const MANIFEST_PATH = join(__dirname, '..', 'build', 'jumbomoji.json');
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const manifestSchema = z.record(z.string(), z.string().array());
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function utf16ToEmoji(utf16: string): string {
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const codePoints = new Array<number>();
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const buf = Buffer.from(utf16, 'hex');
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for (let i = 0; i < buf.length; i += 2) {
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codePoints.push(buf.readUint16BE(i));
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}
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return String.fromCodePoint(...codePoints);
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}
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export type ManifestType = z.infer<typeof manifestSchema>;
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type EmojiEntryType = Readonly<{
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utf16: string;
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sheet: string;
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}>;
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type SheetCacheEntry = Map<string, Uint8Array>;
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export class EmojiService {
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private readonly emojiMap = new Map<string, EmojiEntryType>();
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private readonly sheetCache = new LRU<string, SheetCacheEntry>({
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// Each sheet is roughly 500kb
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max: 10,
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});
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private constructor(
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private readonly resourceService: OptionalResourceService,
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manifest: ManifestType
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) {
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protocol.handle('emoji', async req => {
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const url = new URL(req.url);
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const emoji = url.searchParams.get('emoji');
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if (!emoji) {
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return new Response('invalid', { status: 400 });
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}
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return this.fetch(emoji);
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});
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for (const [sheet, emojiList] of Object.entries(manifest)) {
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for (const utf16 of emojiList) {
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this.emojiMap.set(utf16ToEmoji(utf16), { sheet, utf16 });
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}
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}
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}
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public static async create(
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resourceService: OptionalResourceService
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): Promise<EmojiService> {
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const json = await readFile(MANIFEST_PATH, 'utf8');
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const manifest = manifestSchema.parse(JSON.parse(json));
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return new EmojiService(resourceService, manifest);
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}
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private async fetch(emoji: string): Promise<Response> {
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const entry = this.emojiMap.get(emoji);
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if (!entry) {
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return new Response('entry not found', { status: 404 });
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}
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const { sheet, utf16 } = entry;
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let imageMap = this.sheetCache.get(sheet);
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if (!imageMap) {
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const proto = await this.resourceService.getData(
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`emoji-sheet-${sheet}.proto`
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);
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if (!proto) {
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return new Response('resource not found', { status: 404 });
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}
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const pack = Proto.JumbomojiPack.decode(proto);
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imageMap = new Map(
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pack.items.map(({ name, image }) => [
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name ?? '',
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image || new Uint8Array(0),
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])
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);
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this.sheetCache.set(sheet, imageMap);
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}
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const image = imageMap.get(utf16);
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if (!image) {
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return new Response('image not found', { status: 404 });
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}
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return new Response(image, {
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status: 200,
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headers: {
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'content-type': 'image/webp',
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'cache-control': 'public, max-age=2592000, immutable',
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},
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});
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}
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}
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