feat(android): ai chat scaffold (#11124)

Co-authored-by: graphite-app[bot] <96075541+graphite-app[bot]@users.noreply.github.com>
Co-authored-by: eyhn <cneyhn@gmail.com>

packages/frontend/apps/android/src/proxy.ts

@@ -0,0 +1,65 @@
+import { openDB } from 'idb';
+
+/**
+ * the below code includes the custom fetch and xmlhttprequest implementation for ios webview.
+ * should be included in the entry file of the app or webworker.
+ */
+const rawFetch = globalThis.fetch;
+globalThis.fetch = async (input: RequestInfo | URL, init?: RequestInit) => {
+  const request = new Request(input, init);
+
+  const origin = new URL(request.url, globalThis.location.origin).origin;
+
+  const token = await readEndpointToken(origin);
+  if (token) {
+    request.headers.set('Authorization', `Bearer ${token}`);
+  }
+
+  return rawFetch(request);
+};
+
+const rawXMLHttpRequest = globalThis.XMLHttpRequest;
+globalThis.XMLHttpRequest = class extends rawXMLHttpRequest {
+  override send(body?: Document | XMLHttpRequestBodyInit | null): void {
+    const origin = new URL(this.responseURL, globalThis.location.origin).origin;
+
+    readEndpointToken(origin).then(
+      token => {
+        if (token) {
+          this.setRequestHeader('Authorization', `Bearer ${token}`);
+        }
+        return super.send(body);
+      },
+      () => {
+        throw new Error('Failed to read token');
+      }
+    );
+  }
+};
+
+export async function readEndpointToken(
+  endpoint: string
+): Promise<string | null> {
+  const idb = await openDB('affine-token', 1, {
+    upgrade(db) {
+      if (!db.objectStoreNames.contains('tokens')) {
+        db.createObjectStore('tokens', { keyPath: 'endpoint' });
+      }
+    },
+  });
+
+  const token = await idb.get('tokens', endpoint);
+  return token ? token.token : null;
+}
+
+export async function writeEndpointToken(endpoint: string, token: string) {
+  const db = await openDB('affine-token', 1, {
+    upgrade(db) {
+      if (!db.objectStoreNames.contains('tokens')) {
+        db.createObjectStore('tokens', { keyPath: 'endpoint' });
+      }
+    },
+  });
+
+  await db.put('tokens', { endpoint, token });
+}