add playersettings, img, more match endpoints

apps/img/src/img.app.ts

@@ -0,0 +1,96 @@
+import { Hono } from 'hono'
+import { useWorkersLogger } from 'workers-tagged-logger'
+
+import { withNotFound, withOnError } from '@repo/hono-helpers'
+
+import type { App, Env } from './context'
+
+/** Key id the client uses to look up the public half of the signing key. */
+const SIGNATURE_KEY_ID = 'KEY:RSA:p1.rec.net'
+
+// Import the signing key once per isolate. The key material is constant for the
+// lifetime of the Worker, so caching the promise is safe.
+let signingKey: Promise<CryptoKey | null> | undefined
+
+function getSigningKey(env: Env): Promise<CryptoKey | null> {
+	if (signingKey === undefined) {
+		signingKey = (async () => {
+			if (!env.IMG_SIGNING_KEY) return null
+			const der = Uint8Array.from(atob(env.IMG_SIGNING_KEY), (ch) => ch.charCodeAt(0))
+			return crypto.subtle.importKey(
+				'pkcs8',
+				der,
+				{ name: 'RSASSA-PKCS1-v1_5', hash: 'SHA-1' },
+				false,
+				['sign']
+			)
+		})()
+	}
+	return signingKey
+}
+
+/** RSA-SHA1 sign the bytes, base64-encoded — matches the C# `Signatures.Sign`. */
+async function signImage(env: Env, bytes: ArrayBuffer): Promise<string | null> {
+	const key = await getSigningKey(env)
+	if (!key) return null
+	const sig = await crypto.subtle.sign('RSASSA-PKCS1-v1_5', key, bytes)
+	let binary = ''
+	for (const byte of new Uint8Array(sig)) binary += String.fromCharCode(byte)
+	return btoa(binary)
+}
+
+const app = new Hono<App>()
+	.use(
+		'*',
+		// middleware
+		(c, next) =>
+			useWorkersLogger(c.env.NAME, {
+				environment: c.env.ENVIRONMENT,
+				release: c.env.SENTRY_RELEASE,
+			})(c, next)
+	)
+
+	.onError(withOnError())
+	.notFound(withNotFound())
+
+	.get('/', (c) => c.json({ service: 'img', status: 'ok' }))
+
+	// Stream an image straight from the R2 bucket by key, e.g.
+	// `GET /DefaultProfileImage.jpg`. The key may contain slashes for nested
+	// objects. Supports conditional requests via If-None-Match.
+	//
+	// When the client appends `?sig=p1`, the response body is RSA-SHA1 signed and
+	// the signature returned in a `Content-Signature` header (mirrors the C#
+	// ImageController). Signing requires the full body, so the object is buffered.
+	.get('/:key{.+}', async (c) => {
+		const key = c.req.param('key')
+		if (key.includes('..')) return c.body(null, 400)
+
+		const ifNoneMatch = c.req.header('if-none-match')?.replace(/"/g, '')
+		const object = await c.env.IMAGES.get(
+			key,
+			ifNoneMatch ? { onlyIf: { etagDoesNotMatch: ifNoneMatch } } : undefined
+		)
+		if (!object) return c.notFound()
+
+		const headers = new Headers()
+		object.writeHttpMetadata(headers)
+		headers.set('etag', object.httpEtag)
+		headers.set('cache-control', 'public, max-age=3600')
+
+		// Precondition matched (If-None-Match) → R2 returns no body.
+		if (!('body' in object)) return new Response(null, { status: 304, headers })
+
+		if (c.req.query('sig') === 'p1') {
+			const bytes = await object.arrayBuffer()
+			const signature = await signImage(c.env, bytes)
+			if (signature) {
+				headers.set('content-signature', `key-id=${SIGNATURE_KEY_ID}; data=${signature}`)
+			}
+			return new Response(bytes, { headers })
+		}
+
+		return new Response(object.body, { headers })
+	})
+
+export default app