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