From f534c413fdabb1428840968d09e44d97b0e8e942 Mon Sep 17 00:00:00 2001
From: "shakespeare.diy" <assistant@shakespeare.diy>
Date: Thu, 18 Jun 2026 23:10:13 +0700
Subject: [PATCH] fix: use anchor click to open nostrsigner: URLs in Capacitor
 WebView
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

window.location.href causes WebView to try loading nostrsigner: as an
asset URL. window.open(_system) strips query params. The only reliable
method in Capacitor WebView is creating a temporary <a> element and
clicking it — this correctly triggers Android's intent system with the
full URL intact.

Co-authored-by: shakespeare.diy <assistant@shakespeare.diy>
---
 src/lib/amber.ts | 23 ++++++++++++++++++-----
 1 file changed, 18 insertions(+), 5 deletions(-)

diff --git a/src/lib/amber.ts b/src/lib/amber.ts
index 2691c96..bdf1f0d 100644
--- a/src/lib/amber.ts
+++ b/src/lib/amber.ts
@@ -291,13 +291,26 @@ function buildCallbackUrl(): string {
 /**
  * Navigate to an Amber nostrsigner: URL.
  *
- * Use window.location.href for all platforms — Android handles the
- * nostrsigner: custom scheme via intent-filter regardless of whether
- * we're in a WebView or browser. window.open(_system) was stripping
- * query parameters causing Amber to receive a malformed request.
+ * In Capacitor WebView, custom URI schemes must be opened via a
+ * temporary <a> element click — this triggers Android's intent system
+ * correctly without the WebView trying to load it as an asset URL
+ * (window.location.href) or stripping query params (window.open _system).
  */
 function openAmberUrl(url: string): void {
-  window.location.href = url;
+  const isCapacitor = !!(window as unknown as { Capacitor?: { isNativePlatform?: () => boolean } }).Capacitor?.isNativePlatform?.();
+  if (isCapacitor) {
+    // Create a temporary anchor and click it — this is the only reliable
+    // way to fire an Android intent from a Capacitor WebView without
+    // the WebView intercepting the navigation or stripping query params.
+    const a = document.createElement('a');
+    a.href = url;
+    a.style.display = 'none';
+    document.body.appendChild(a);
+    a.click();
+    setTimeout(() => document.body.removeChild(a), 100);
+  } else {
+    window.location.href = url;
+  }
 }
 
 /**