From b83110a8dccb9615ff56787e4358323151ffc453 Mon Sep 17 00:00:00 2001
From: Adam Soltys <adam@coinos.io>
Date: Mon, 9 Mar 2026 08:30:41 -0700
Subject: use JavascriptInterface for HCE instead of Capacitor plugin

---
 .../app/src/main/java/io/coinos/MainActivity.java    | 20 ++++++++++++++++++++
 src/routes/(app)/fund/[id]/+page.svelte              |  6 +++---
 2 files changed, 23 insertions(+), 3 deletions(-)

diff --git a/android/app/src/main/java/io/coinos/MainActivity.java b/android/app/src/main/java/io/coinos/MainActivity.java
index 3a5654a3..83b731a3 100644
--- a/android/app/src/main/java/io/coinos/MainActivity.java
+++ b/android/app/src/main/java/io/coinos/MainActivity.java
@@ -5,6 +5,8 @@ import android.view.View;
 import android.view.WindowInsets;
 import android.view.WindowManager;
 import androidx.core.view.ViewCompat;
+import androidx.webkit.WebSettingsCompat;
+import androidx.webkit.WebViewFeature;
 
 import com.getcapacitor.BridgeActivity;
 import com.getcapacitor.Bridge;
@@ -25,6 +27,8 @@ import java.util.Arrays;
 
 import io.coinos.nfcwriter.NfcWriterPlugin;
 import io.coinos.hce.HcePlugin;
+import io.coinos.hce.HceApduService;
+import android.webkit.JavascriptInterface;
 
 public class MainActivity extends BridgeActivity {
     private NfcAdapter nfcAdapter;
@@ -52,6 +56,22 @@ public class MainActivity extends BridgeActivity {
             });
         }
 
+        // Enable WebAuthn/passkey support in WebView
+        if (WebViewFeature.isFeatureSupported(WebViewFeature.WEB_AUTHENTICATION)) {
+            WebSettingsCompat.setWebAuthenticationSupport(
+                webView.getSettings(),
+                WebSettingsCompat.WEB_AUTHENTICATION_SUPPORT_FOR_APP
+            );
+        }
+
+        // Expose HCE control to JavaScript
+        webView.addJavascriptInterface(new Object() {
+            @JavascriptInterface
+            public void setUrl(String url) { HceApduService.setUrl(url); }
+            @JavascriptInterface
+            public String getUrl() { return HceApduService.getUrl(); }
+        }, "CoinosHce");
+
         // Other app setup
         CookieManager cookieManager = CookieManager.getInstance();
         cookieManager.setAcceptCookie(true);
diff --git a/src/routes/(app)/fund/[id]/+page.svelte b/src/routes/(app)/fund/[id]/+page.svelte
index fc3e9bc8..8bd8489a 100644
--- a/src/routes/(app)/fund/[id]/+page.svelte
+++ b/src/routes/(app)/fund/[id]/+page.svelte
@@ -16,7 +16,7 @@
   import { copy, sats, loc, post } from "$lib/utils";
   import { loginRedirect } from "$lib/store";
 
-  const Hce = (window as any).Capacitor?.registerPlugin?.("Hce");
+  const Hce = (window as any).CoinosHce;
 
   let { data }: any = $props();
 
@@ -43,14 +43,14 @@
   function enableHce() {
     if (!Hce) return;
     const url = `${$page.url.origin}/api/lnurlw/${id}`;
-    Hce.setUrl({ url });
+    Hce.setUrl(url);
     hceActive = true;
     toast.push("NFC armed — ready to tap");
   }
 
   function disableHce() {
     if (!Hce) return;
-    Hce.setUrl({ url: "https://coinos.io" });
+    Hce.setUrl("https://coinos.io");
     hceActive = false;
   }
 
-- 
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