SilverBullet pivot to become an offline-first PWA (#403)

common/proxy_fetch.ts

@@ -0,0 +1,37 @@
+import { base64Encode } from "../plugos/asset_bundle/base64.ts";
+
+export type ProxyFetchRequest = {
+  method?: string;
+  headers?: Record<string, string>;
+  body?: string;
+};
+
+export type ProxyFetchResponse = {
+  ok: boolean;
+  status: number;
+  headers: Record<string, string>;
+  // We base64 encode the body because the body can be binary data that we have to push through the worker boundary
+  base64Body: string;
+};
+
+export async function performLocalFetch(
+  url: string,
+  req: ProxyFetchRequest,
+): Promise<ProxyFetchResponse> {
+  const result = await fetch(
+    url,
+    req && {
+      method: req.method,
+      headers: req.headers,
+      body: req.body,
+    },
+  );
+  return {
+    ok: result.ok,
+    status: result.status,
+    headers: Object.fromEntries(result.headers.entries()),
+    base64Body: base64Encode(
+      new Uint8Array(await (await result.blob()).arrayBuffer()),
+    ),
+  };
+}