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helpers.ts
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helpers.ts
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import type { Bindings } from './env';
let antLogoDataUrl: Promise<string> | null = null;
let ogFontBytes: Promise<Uint8Array[]> | null = null;
export async function sha256(input: string): Promise<string> {
const digest = await crypto.subtle.digest('SHA-256', new TextEncoder().encode(input));
return [...new Uint8Array(digest)].map(byte => byte.toString(16).padStart(2, '0')).join('');
}
export function publicUrl(requestUrl: string, id: string): string {
const url = new URL(requestUrl);
return `${url.origin}/${id}`;
}
export function publicOgImageUrl(requestUrl: string, id: string): string {
const url = new URL(requestUrl);
return `${url.origin}/og/${id}.png`;
}
export function ogImageId(value: string): string {
return value.endsWith('.png') ? value.slice(0, -4) : value;
}
function bytesToBase64(bytes: Uint8Array): string {
let binary = '';
const chunkSize = 0x8000;
for (let i = 0; i < bytes.length; i += chunkSize) {
binary += String.fromCharCode(...bytes.subarray(i, i + chunkSize));
}
return btoa(binary);
}
async function loadAntLogoDataUrl(env: Bindings, requestUrl: string): Promise<string> {
const response = await env.ASSETS.fetch(new Request(new URL('/assets/ant.png', requestUrl)));
if (!response.ok) return '';
const bytes = new Uint8Array(await response.arrayBuffer());
return `data:image/png;base64,${bytesToBase64(bytes)}`;
}
async function loadAssetBytes(
env: Bindings,
requestUrl: string,
path: string,
): Promise<Uint8Array> {
const response = await env.ASSETS.fetch(new Request(new URL(path, requestUrl)));
if (!response.ok) return new Uint8Array();
return new Uint8Array(await response.arrayBuffer());
}
export function getAntLogoDataUrl(env: Bindings, requestUrl: string): Promise<string> {
antLogoDataUrl ??= loadAntLogoDataUrl(env, requestUrl);
return antLogoDataUrl;
}
export function getOgFontBytes(env: Bindings, requestUrl: string): Promise<Uint8Array[]> {
ogFontBytes ??= Promise.all([
loadAssetBytes(env, requestUrl, '/assets/Arial.ttf'),
loadAssetBytes(env, requestUrl, '/assets/Arial-Bold.ttf'),
loadAssetBytes(env, requestUrl, '/assets/BerkeleyMono-Regular.woff2'),
]);
return ogFontBytes;
}

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