shim plugin related APIs, proxy web requests.

shims/electron/ipc-renderer.js

@@ -76,6 +76,68 @@ const syncHandlers = {
   resources: () => "",
 };
 
+function arrayBufferToBase64(buf) {
+  const bytes = new Uint8Array(buf);
+  let binary = "";
+  const chunk = 8192;
+  for (let i = 0; i < bytes.length; i += chunk) {
+    binary += String.fromCharCode.apply(null, bytes.subarray(i, i + chunk));
+  }
+  return btoa(binary);
+}
+
+function base64ToArrayBuffer(base64) {
+  const binary = atob(base64);
+  const bytes = new Uint8Array(binary.length);
+  for (let i = 0; i < binary.length; i++) {
+    bytes[i] = binary.charCodeAt(i);
+  }
+  return bytes.buffer;
+}
+
+async function handleRequestUrl(requestId, request) {
+  try {
+    let body = request.body;
+    let binary = false;
+    if (body instanceof ArrayBuffer) {
+      body = arrayBufferToBase64(body);
+      binary = true;
+    }
+
+    const res = await fetch("/api/proxy", {
+      method: "POST",
+      headers: { "Content-Type": "application/json" },
+      body: JSON.stringify({
+        url: request.url,
+        method: request.method || "GET",
+        headers: request.headers || {},
+        contentType: request.contentType,
+        body,
+        binary,
+      }),
+    });
+
+    const proxyResult = await res.json();
+    if (!res.ok) {
+      ipcRenderer._emit(requestId, {
+        error: proxyResult.error || "Proxy request failed",
+      });
+      return;
+    }
+
+    // Electron's e.reply(requestId, data) sends on the requestId channel
+    ipcRenderer._emit(requestId, {
+      status: proxyResult.status,
+      headers: proxyResult.headers,
+      body: base64ToArrayBuffer(proxyResult.body),
+    });
+  } catch (e) {
+    ipcRenderer._emit(requestId, {
+      error: e.message,
+    });
+  }
+}
+
 export const ipcRenderer = {
   send(channel, ...args) {
     console.log("[shim:ipcRenderer] send:", channel, args);
@@ -89,6 +151,12 @@ export const ipcRenderer = {
       );
       return;
     }
+
+    if (channel === "request-url") {
+      const [requestId, request] = args;
+      handleRequestUrl(requestId, request);
+      return;
+    }
   },
 
   sendSync(channel, ...args) {