Confirm proxy use before the first web request (#657)

apps/yaak-client/lib/confirmWebProxy.tsx

@@ -0,0 +1,60 @@
+import { platform } from "@yaakapp-internal/platform";
+import { InlineCode } from "@yaakapp-internal/ui";
+import { Link } from "../components/core/Link";
+import { showConfirm } from "./confirm";
+
+const acceptedProxies = new Set<string>();
+const pendingConfirmations = new Map<string, Promise<boolean>>();
+
+/** One decision for all pending sends; only acceptance is remembered. */
+export function confirmWebProxy(): Promise<boolean> {
+  const proxyUrl = platform.httpProxyUrl;
+  if (proxyUrl == null) return Promise.resolve(true);
+
+  const key = `yaak.webProxyConsent.v1:${proxyUrl}`;
+  try {
+    if (localStorage.getItem(key) === "accepted") return Promise.resolve(true);
+  } catch {
+    // Storage can be unavailable in private or restricted browsing.
+  }
+  if (acceptedProxies.has(proxyUrl)) return Promise.resolve(true);
+
+  const pending = pendingConfirmations.get(proxyUrl);
+  if (pending != null) return pending;
+
+  const confirmation = showConfirm({
+    id: "web-proxy-consent",
+    title: "Requests in Yaak Web use a proxy",
+    confirmText: "Send via Proxy",
+    description: (
+      <div className="space-y-3">
+        <p>
+          Yaak Web sends requests through a hosted proxy. Request and response data, including
+          credentials, pass through the server shown below.
+        </p>
+        <p>
+          <InlineCode className="break-all">{proxyUrl}</InlineCode>
+        </p>
+        <p>
+          Learn more about{" "}
+          <Link href="https://yaak.app/docs/getting-started/web-proxy">how the proxy works</Link>.
+        </p>
+      </div>
+    ),
+  })
+    .then((accepted) => {
+      if (accepted) {
+        acceptedProxies.add(proxyUrl);
+        try {
+          localStorage.setItem(key, "accepted");
+        } catch {
+          // Keep acceptance for this tab if it cannot be persisted.
+        }
+      }
+      return accepted;
+    })
+    .finally(() => pendingConfirmations.delete(proxyUrl));
+
+  pendingConfirmations.set(proxyUrl, confirmation);
+  return confirmation;
+}