feat(client): add browser host SDK

packages/client/test/node/proxy-certificate.test.ts

@@ -0,0 +1,22 @@
+import { createHash, X509Certificate } from "node:crypto"
+import { createSecureContext } from "node:tls"
+import { describe, expect, test } from "bun:test"
+import { createBrowserProxyCertificate } from "../../src/node/browser/proxy-certificate"
+
+describe("browser proxy certificate", () => {
+  test("creates a unique valid certificate pinned to its loopback names", () => {
+    const hostname = "opencode-test.localhost"
+    const first = createBrowserProxyCertificate(hostname)
+    const second = createBrowserProxyCertificate(hostname)
+    const certificate = new X509Certificate(first.certificate)
+    const fingerprint = createHash("sha256").update(certificate.raw).digest("base64")
+
+    expect(first.key.startsWith("-----BEGIN PRIVATE KEY-----")).toBe(true)
+    expect(first.certificate.startsWith("-----BEGIN CERTIFICATE-----")).toBe(true)
+    expect(first.fingerprint).toBe(`sha256/${fingerprint}`)
+    expect(certificate.subjectAltName).toContain(`DNS:${hostname}`)
+    expect(certificate.subjectAltName).toContain("IP Address:127.0.0.1")
+    expect(first.fingerprint).not.toBe(second.fingerprint)
+    expect(() => createSecureContext({ key: first.key, cert: first.certificate })).not.toThrow()
+  })
+})