All previous URL-scheme approaches (nostrsigner:, intent:) were fundamentally
wrong for a Capacitor app. JavaScript in a WebView cannot reliably dispatch
Android intents via URL navigation.
The correct solution — used by Coracle and other Capacitor-based Nostr apps —
is the nostr-signer-capacitor-plugin which communicates with Amber via native
Android intents through the Capacitor bridge:
NostrSignerPlugin.setPackageName({ packageName: 'com.greenart7c3.nostrsigner' })
NostrSignerPlugin.isExternalSignerInstalled()
NostrSignerPlugin.getPublicKey() → { npub }
This is synchronous from the JS side, handles the entire Android intent
roundtrip natively, and returns the pubkey directly. No URL encoding,
no callback URLs, no redirects, no malformed request errors.
Co-authored-by: shakespeare.diy <assistant@shakespeare.diy>
GrapheneOS Vanadium browser blocks intent: URLs from web pages as a
security hardening measure. This is why every URL format we tried
caused "malformed request" — Vanadium was blocking the intent before
Amber ever saw it.
New flow that works on ALL Android browsers including GrapheneOS:
1. Tap "Open Amber" → navigates to nostrsigner: URL with no callbackUrl
(Amber copies pubkey to clipboard when no callbackUrl is given)
2. User approves in Amber, comes back to app
3. App tries navigator.clipboard.readText() automatically on visibilitychange
4. If clipboard permission denied → shows paste input for hex pubkey
5. User pastes pubkey → logged in
No intent: scheme, no callback URL, no redirect loop. Simple and bulletproof.
Co-authored-by: shakespeare.diy <assistant@shakespeare.diy>
Three compounding bugs fixed:
1. WRONG FORMAT: Was using nostrsigner: directly, then intent: with encoded
values. Amber README shows intent: with raw unencoded S.key=value params.
2. # IN CALLBACKURL: Our callbackUrl was https://.../#/amber-callback which
contains a # — but intent: uses # as its own delimiter (#Intent;...;end).
Having a # inside the callbackUrl value breaks the entire intent string.
Fixed: callbackUrl is now https://.../amber-callback?event= (no hash).
3. HASHROUTER MISMATCH: Amber opens /amber-callback (no hash) but HashRouter
only handles /#/route paths. Fixed in main.tsx: pre-React IIFE detects
/amber-callback path, saves ?event= to sessionStorage, then redirects to
/#/amber-callback so React Router matches AmberCallbackPage correctly.
Final correct intent URL format:
intent:#Intent;scheme=nostrsigner;S.compressionType=none;S.returnType=signature;S.type=get_public_key;S.callbackUrl=https://skate-spots.org/amber-callback?event=;end
Co-authored-by: shakespeare.diy <assistant@shakespeare.diy>
Root cause of "malformed request":
- buildIntentUrl() was calling encodeURIComponent() on ALL values including
callbackUrl, which was ALREADY a full URL with special chars
- This double-encoded the callbackUrl, arriving at Amber as garbage
- The intent: wrapper format was also unnecessary
Fix: back to clean nostrsigner: format per NIP-55 spec
- Only callbackUrl gets encodeURIComponent (once)
- All other params are plain query string values
- Matches exactly what NIP-55 spec shows in its example code
Co-authored-by: shakespeare.diy <assistant@shakespeare.diy>
- release_notes must be a file path for zsp, not inline YAML text
- add release-notes.txt with v1.0.26 changelog
- sync package.json version to 1.0.26 to match APK versionName
Co-authored-by: shakespeare.diy <assistant@shakespeare.diy>
