feat: mobile Nostr identity — Amber NIP-55 + nsec fallback (Fixes #29)
- Add NostrIdentityContext with SecureStore-backed nsec storage and pure-JS bech32/secp256k1 for nsec→npub derivation; private key never enters React state or logs - Android: NIP-55 Amber deep-link integration (get_public_key + sign_event) with install-prompt fallback to Play Store when Amber is absent; Android queries manifest entry for com.greenart7c3.nostrsigner - iOS/both: manual nsec entry stored exclusively in expo-secure-store - Settings tab (gear icon) added to both NativeTabLayout and ClassicTabLayout showing: connected npub (truncated), signing method badge, Disconnect button (with confirmation + SecureStore wipe) - Root layout wrapped with NostrIdentityProvider - app.json: add expo-secure-store plugin + Android intentFilters for mobile://amber-callback deep-link return path Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
Alexander Whitestone
@@ -20,7 +20,18 @@
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"adaptiveIcon": {
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"foregroundImage": "./assets/images/icon.png",
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"backgroundColor": "#0A0A12"
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}
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},
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"intentFilters": [
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{
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"action": "VIEW",
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"autoVerify": true,
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"data": [{ "scheme": "mobile", "host": "amber-callback" }],
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"category": ["BROWSABLE", "DEFAULT"]
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}
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],
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"queries": [
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{ "package": "com.greenart7c3.nostrsigner" }
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]
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},
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"web": {
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"favicon": "./assets/images/icon.png",
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@@ -34,6 +45,7 @@
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}
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],
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"expo-font",
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"expo-secure-store",
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"expo-web-browser"
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],
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"extra": {
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@@ -25,6 +25,10 @@ function NativeTabLayout() {
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<Icon sf={{ default: "list.bullet", selected: "list.bullet.circle.fill" }} />
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<Label>Feed</Label>
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</NativeTabs.Trigger>
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<NativeTabs.Trigger name="settings">
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<Icon sf={{ default: "gearshape", selected: "gearshape.fill" }} />
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<Label>Settings</Label>
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</NativeTabs.Trigger>
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</NativeTabs>
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);
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}
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@@ -100,6 +104,18 @@ function ClassicTabLayout() {
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),
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}}
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/>
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<Tabs.Screen
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name="settings"
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options={{
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title: "Settings",
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tabBarIcon: ({ color, size }) =>
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isIOS ? (
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<SymbolView name="gearshape" tintColor={color} size={size} />
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) : (
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<Feather name="settings" size={size} color={color} />
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),
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}}
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/>
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</Tabs>
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);
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}
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513
artifacts/mobile/app/(tabs)/settings.tsx
Normal file
513
artifacts/mobile/app/(tabs)/settings.tsx
Normal file
@@ -0,0 +1,513 @@
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import { Feather } from "@expo/vector-icons";
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import * as Haptics from "expo-haptics";
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import * as Linking from "expo-linking";
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import React, { useCallback, useState } from "react";
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import {
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ActivityIndicator,
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Alert,
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Platform,
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Pressable,
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ScrollView,
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StyleSheet,
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Text,
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TextInput,
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View,
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} from "react-native";
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import { useSafeAreaInsets } from "react-native-safe-area-context";
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import { Colors } from "@/constants/colors";
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import {
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AMBER_PACKAGE,
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truncateNpub,
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useNostrIdentity,
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} from "@/context/NostrIdentityContext";
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const C = Colors.dark;
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const PLAY_STORE_AMBER =
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"https://play.google.com/store/apps/details?id=" + AMBER_PACKAGE;
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export default function SettingsScreen() {
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const insets = useSafeAreaInsets();
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const {
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npub,
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isConnected,
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signingMethod,
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amberAvailable,
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connectWithNsec,
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connectWithAmber,
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disconnect,
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} = useNostrIdentity();
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const [nsecInput, setNsecInput] = useState("");
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const [nsecError, setNsecError] = useState<string | null>(null);
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const [loading, setLoading] = useState<"nsec" | "amber" | "disconnect" | null>(null);
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const topPad = Platform.OS === "web" ? 67 : insets.top;
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const bottomPad = Platform.OS === "web" ? 84 + 34 : insets.bottom + 84;
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const handleConnectNsec = useCallback(async () => {
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const trimmed = nsecInput.trim();
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if (!trimmed.startsWith("nsec1")) {
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setNsecError("Must be a valid nsec1… key");
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return;
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}
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setNsecError(null);
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setLoading("nsec");
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try {
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await connectWithNsec(trimmed);
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Haptics.notificationAsync(Haptics.NotificationFeedbackType.Success);
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setNsecInput("");
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} catch (err) {
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const msg =
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err instanceof Error ? err.message : "Failed to connect identity";
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setNsecError(msg);
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} finally {
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setLoading(null);
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}
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}, [nsecInput, connectWithNsec]);
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const handleConnectAmber = useCallback(async () => {
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setLoading("amber");
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try {
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await connectWithAmber();
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Haptics.notificationAsync(Haptics.NotificationFeedbackType.Success);
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} catch (err) {
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const msg =
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err instanceof Error ? err.message : "Failed to connect via Amber";
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Alert.alert("Amber error", msg);
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} finally {
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setLoading(null);
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}
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}, [connectWithAmber]);
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const handleInstallAmber = useCallback(() => {
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Linking.openURL(PLAY_STORE_AMBER);
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}, []);
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const handleDisconnect = useCallback(() => {
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Alert.alert(
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"Disconnect Nostr identity",
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"Your private key will be wiped from this device. This cannot be undone.",
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[
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{ text: "Cancel", style: "cancel" },
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{
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text: "Disconnect",
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style: "destructive",
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onPress: async () => {
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setLoading("disconnect");
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try {
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await disconnect();
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Haptics.notificationAsync(
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Haptics.NotificationFeedbackType.Warning
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);
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} finally {
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setLoading(null);
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}
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},
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},
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]
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);
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}, [disconnect]);
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return (
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<ScrollView
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style={[styles.container, { paddingTop: topPad }]}
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contentContainerStyle={[styles.content, { paddingBottom: bottomPad }]}
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keyboardShouldPersistTaps="handled"
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>
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{/* Header */}
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<View style={styles.header}>
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<Text style={styles.title}>Settings</Text>
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</View>
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{/* ── Nostr Identity section ── */}
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<SectionHeader label="Nostr Identity" />
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{isConnected && npub ? (
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<>
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<Card>
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<Row>
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<View style={styles.npubIconWrap}>
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<Feather name="key" size={16} color={C.accentGlow} />
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</View>
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<View style={styles.npubTextWrap}>
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<Text style={styles.npubLabel}>
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{signingMethod === "amber" ? "Via Amber" : "Manual nsec"}
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</Text>
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<Text style={styles.npubValue} selectable>
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{truncateNpub(npub)}
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</Text>
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</View>
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<View
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style={[
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styles.methodBadge,
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signingMethod === "amber"
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? styles.methodBadgeAmber
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: styles.methodBadgeNsec,
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]}
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>
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<Text style={styles.methodBadgeText}>
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{signingMethod === "amber" ? "Amber" : "nsec"}
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</Text>
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</View>
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</Row>
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</Card>
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<Pressable
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onPress={handleDisconnect}
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style={({ pressed }) => [
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styles.dangerButton,
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pressed && styles.dangerButtonPressed,
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]}
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disabled={loading === "disconnect"}
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accessibilityRole="button"
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accessibilityLabel="Disconnect Nostr identity"
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>
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{loading === "disconnect" ? (
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<ActivityIndicator size="small" color={C.error} />
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) : (
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<>
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<Feather name="log-out" size={16} color={C.error} />
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<Text style={styles.dangerButtonText}>Disconnect</Text>
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</>
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)}
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</Pressable>
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</>
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) : (
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<>
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{/* Android — Amber option */}
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{Platform.OS === "android" && (
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<Card>
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<Text style={styles.sectionDesc}>
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Use{" "}
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<Text style={styles.highlight}>Amber</Text> to sign events
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without exposing your key to this app.
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</Text>
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{amberAvailable ? (
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<PrimaryButton
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label="Connect via Amber"
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icon="shield"
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loading={loading === "amber"}
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onPress={handleConnectAmber}
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/>
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) : (
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<>
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<View style={styles.notInstalledRow}>
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<Feather
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name="alert-circle"
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size={14}
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color={C.textMuted}
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/>
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<Text style={styles.notInstalledText}>
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Amber is not installed
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</Text>
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</View>
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<PrimaryButton
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label="Install Amber (Play Store)"
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icon="download"
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onPress={handleInstallAmber}
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/>
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</>
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)}
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</Card>
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)}
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{/* Both platforms — nsec entry */}
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<Card>
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<Text style={styles.sectionDesc}>
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{Platform.OS === "ios"
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? "Enter your nsec to connect your Nostr identity. The key is stored only in the iOS Keychain."
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: "Alternatively, enter your nsec directly. The key is stored only in the Android Keystore."}
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</Text>
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<TextInput
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style={[styles.nsecInput, nsecError ? styles.nsecInputError : null]}
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value={nsecInput}
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onChangeText={(t) => {
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setNsecInput(t);
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if (nsecError) setNsecError(null);
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}}
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placeholder="nsec1…"
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placeholderTextColor={C.textMuted}
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autoCapitalize="none"
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autoCorrect={false}
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secureTextEntry
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returnKeyType="done"
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onSubmitEditing={handleConnectNsec}
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accessibilityLabel="nsec private key input"
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/>
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{nsecError ? (
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<Text style={styles.errorText}>{nsecError}</Text>
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) : null}
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<PrimaryButton
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label="Connect with nsec"
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icon="log-in"
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loading={loading === "nsec"}
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onPress={handleConnectNsec}
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disabled={!nsecInput.trim()}
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/>
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</Card>
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</>
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)}
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{/* Security notice */}
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<View style={styles.securityNote}>
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<Feather name="lock" size={12} color={C.textMuted} />
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<Text style={styles.securityNoteText}>
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Your private key is stored exclusively in the device secure enclave
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and is never logged, transmitted, or held in app memory.
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</Text>
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</View>
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</ScrollView>
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);
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}
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// ---------------------------------------------------------------------------
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// Small UI helpers
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// ---------------------------------------------------------------------------
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function SectionHeader({ label }: { label: string }) {
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return (
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<View style={styles.sectionHeader}>
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<Text style={styles.sectionHeaderText}>{label.toUpperCase()}</Text>
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</View>
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);
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}
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function Card({ children }: { children: React.ReactNode }) {
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return <View style={styles.card}>{children}</View>;
|
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}
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|
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function Row({ children }: { children: React.ReactNode }) {
|
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return <View style={styles.row}>{children}</View>;
|
||||
}
|
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|
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function PrimaryButton({
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label,
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icon,
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loading = false,
|
||||
disabled = false,
|
||||
onPress,
|
||||
}: {
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label: string;
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icon: React.ComponentProps<typeof Feather>["name"];
|
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loading?: boolean;
|
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disabled?: boolean;
|
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onPress: () => void;
|
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}) {
|
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return (
|
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<Pressable
|
||||
onPress={onPress}
|
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style={({ pressed }) => [
|
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styles.primaryButton,
|
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(disabled || loading) && styles.primaryButtonDisabled,
|
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pressed && !disabled && styles.primaryButtonPressed,
|
||||
]}
|
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disabled={disabled || loading}
|
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accessibilityRole="button"
|
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accessibilityLabel={label}
|
||||
>
|
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{loading ? (
|
||||
<ActivityIndicator size="small" color={C.text} />
|
||||
) : (
|
||||
<>
|
||||
<Feather name={icon} size={16} color={C.text} />
|
||||
<Text style={styles.primaryButtonText}>{label}</Text>
|
||||
</>
|
||||
)}
|
||||
</Pressable>
|
||||
);
|
||||
}
|
||||
|
||||
// ---------------------------------------------------------------------------
|
||||
// Styles
|
||||
// ---------------------------------------------------------------------------
|
||||
|
||||
const styles = StyleSheet.create({
|
||||
container: {
|
||||
flex: 1,
|
||||
backgroundColor: C.background,
|
||||
},
|
||||
content: {
|
||||
paddingHorizontal: 16,
|
||||
gap: 8,
|
||||
},
|
||||
header: {
|
||||
paddingHorizontal: 8,
|
||||
paddingTop: 12,
|
||||
paddingBottom: 16,
|
||||
},
|
||||
title: {
|
||||
fontSize: 28,
|
||||
fontFamily: "Inter_700Bold",
|
||||
color: C.text,
|
||||
letterSpacing: -0.5,
|
||||
},
|
||||
sectionHeader: {
|
||||
paddingHorizontal: 8,
|
||||
paddingTop: 12,
|
||||
paddingBottom: 4,
|
||||
},
|
||||
sectionHeaderText: {
|
||||
fontSize: 11,
|
||||
fontFamily: "Inter_600SemiBold",
|
||||
color: C.textMuted,
|
||||
letterSpacing: 1.2,
|
||||
},
|
||||
card: {
|
||||
backgroundColor: C.surface,
|
||||
borderRadius: 16,
|
||||
borderWidth: 1,
|
||||
borderColor: C.border,
|
||||
padding: 16,
|
||||
gap: 12,
|
||||
},
|
||||
row: {
|
||||
flexDirection: "row",
|
||||
alignItems: "center",
|
||||
gap: 12,
|
||||
},
|
||||
npubIconWrap: {
|
||||
width: 32,
|
||||
height: 32,
|
||||
borderRadius: 8,
|
||||
backgroundColor: C.surfaceElevated,
|
||||
alignItems: "center",
|
||||
justifyContent: "center",
|
||||
},
|
||||
npubTextWrap: {
|
||||
flex: 1,
|
||||
gap: 2,
|
||||
},
|
||||
npubLabel: {
|
||||
fontSize: 11,
|
||||
fontFamily: "Inter_500Medium",
|
||||
color: C.textMuted,
|
||||
letterSpacing: 0.4,
|
||||
},
|
||||
npubValue: {
|
||||
fontSize: 13,
|
||||
fontFamily: "Inter_500Medium",
|
||||
color: C.text,
|
||||
letterSpacing: 0.2,
|
||||
},
|
||||
methodBadge: {
|
||||
paddingHorizontal: 8,
|
||||
paddingVertical: 3,
|
||||
borderRadius: 8,
|
||||
},
|
||||
methodBadgeAmber: {
|
||||
backgroundColor: "#F59E0B22",
|
||||
borderWidth: 1,
|
||||
borderColor: "#F59E0B55",
|
||||
},
|
||||
methodBadgeNsec: {
|
||||
backgroundColor: C.accent + "22",
|
||||
borderWidth: 1,
|
||||
borderColor: C.accent + "55",
|
||||
},
|
||||
methodBadgeText: {
|
||||
fontSize: 11,
|
||||
fontFamily: "Inter_600SemiBold",
|
||||
color: C.textSecondary,
|
||||
},
|
||||
sectionDesc: {
|
||||
fontSize: 13,
|
||||
fontFamily: "Inter_400Regular",
|
||||
color: C.textSecondary,
|
||||
lineHeight: 18,
|
||||
},
|
||||
highlight: {
|
||||
color: C.accentGlow,
|
||||
fontFamily: "Inter_600SemiBold",
|
||||
},
|
||||
notInstalledRow: {
|
||||
flexDirection: "row",
|
||||
alignItems: "center",
|
||||
gap: 6,
|
||||
},
|
||||
notInstalledText: {
|
||||
fontSize: 12,
|
||||
fontFamily: "Inter_400Regular",
|
||||
color: C.textMuted,
|
||||
},
|
||||
nsecInput: {
|
||||
backgroundColor: C.surfaceElevated,
|
||||
borderRadius: 10,
|
||||
borderWidth: 1,
|
||||
borderColor: C.border,
|
||||
paddingHorizontal: 14,
|
||||
paddingVertical: 11,
|
||||
fontSize: 14,
|
||||
fontFamily: "Inter_400Regular",
|
||||
color: C.text,
|
||||
},
|
||||
nsecInputError: {
|
||||
borderColor: C.error,
|
||||
},
|
||||
errorText: {
|
||||
fontSize: 12,
|
||||
fontFamily: "Inter_400Regular",
|
||||
color: C.error,
|
||||
marginTop: -4,
|
||||
},
|
||||
primaryButton: {
|
||||
flexDirection: "row",
|
||||
alignItems: "center",
|
||||
justifyContent: "center",
|
||||
gap: 8,
|
||||
backgroundColor: C.accent,
|
||||
borderRadius: 12,
|
||||
paddingVertical: 13,
|
||||
paddingHorizontal: 20,
|
||||
},
|
||||
primaryButtonDisabled: {
|
||||
opacity: 0.5,
|
||||
},
|
||||
primaryButtonPressed: {
|
||||
opacity: 0.8,
|
||||
},
|
||||
primaryButtonText: {
|
||||
fontSize: 15,
|
||||
fontFamily: "Inter_600SemiBold",
|
||||
color: C.text,
|
||||
},
|
||||
dangerButton: {
|
||||
flexDirection: "row",
|
||||
alignItems: "center",
|
||||
justifyContent: "center",
|
||||
gap: 8,
|
||||
backgroundColor: C.error + "15",
|
||||
borderRadius: 12,
|
||||
borderWidth: 1,
|
||||
borderColor: C.error + "40",
|
||||
paddingVertical: 13,
|
||||
paddingHorizontal: 20,
|
||||
marginTop: 4,
|
||||
},
|
||||
dangerButtonPressed: {
|
||||
opacity: 0.7,
|
||||
},
|
||||
dangerButtonText: {
|
||||
fontSize: 15,
|
||||
fontFamily: "Inter_600SemiBold",
|
||||
color: C.error,
|
||||
},
|
||||
securityNote: {
|
||||
flexDirection: "row",
|
||||
alignItems: "flex-start",
|
||||
gap: 6,
|
||||
paddingHorizontal: 8,
|
||||
paddingTop: 8,
|
||||
},
|
||||
securityNoteText: {
|
||||
flex: 1,
|
||||
fontSize: 11,
|
||||
fontFamily: "Inter_400Regular",
|
||||
color: C.textMuted,
|
||||
lineHeight: 16,
|
||||
},
|
||||
});
|
||||
@@ -16,6 +16,7 @@ import { SafeAreaProvider } from "react-native-safe-area-context";
|
||||
|
||||
import { ErrorBoundary } from "@/components/ErrorBoundary";
|
||||
import { TimmyProvider } from "@/context/TimmyContext";
|
||||
import { NostrIdentityProvider } from "@/context/NostrIdentityContext";
|
||||
import { ONBOARDING_COMPLETED_KEY } from "@/constants/storage-keys";
|
||||
|
||||
SplashScreen.preventAutoHideAsync();
|
||||
@@ -76,9 +77,11 @@ export default function RootLayout() {
|
||||
<QueryClientProvider client={queryClient}>
|
||||
<GestureHandlerRootView style={{ flex: 1 }}>
|
||||
<KeyboardProvider>
|
||||
<TimmyProvider>
|
||||
<RootLayoutNav />
|
||||
</TimmyProvider>
|
||||
<NostrIdentityProvider>
|
||||
<TimmyProvider>
|
||||
<RootLayoutNav />
|
||||
</TimmyProvider>
|
||||
</NostrIdentityProvider>
|
||||
</KeyboardProvider>
|
||||
</GestureHandlerRootView>
|
||||
</QueryClientProvider>
|
||||
|
||||
@@ -1 +1,2 @@
|
||||
export const ONBOARDING_COMPLETED_KEY = "app.onboarding_completed";
|
||||
export const NOSTR_NSEC_KEY = "app.nostr_nsec";
|
||||
|
||||
543
artifacts/mobile/context/NostrIdentityContext.tsx
Normal file
543
artifacts/mobile/context/NostrIdentityContext.tsx
Normal file
@@ -0,0 +1,543 @@
|
||||
/**
|
||||
* NostrIdentityContext — manages Nostr identity on mobile.
|
||||
*
|
||||
* Android: NIP-55 Amber deep-link signing (falls back to nsec if Amber absent).
|
||||
* iOS: manual nsec entry only — key is stored exclusively in SecureStore.
|
||||
*
|
||||
* Security invariants:
|
||||
* - The private key (nsec / raw bytes) is NEVER stored in React state.
|
||||
* - The private key is NEVER logged.
|
||||
* - Only the npub (public key, bech32) lives in React state.
|
||||
*/
|
||||
import * as SecureStore from "expo-secure-store";
|
||||
import * as Linking from "expo-linking";
|
||||
import React, {
|
||||
createContext,
|
||||
useCallback,
|
||||
useContext,
|
||||
useEffect,
|
||||
useMemo,
|
||||
useRef,
|
||||
useState,
|
||||
} from "react";
|
||||
import { Platform } from "react-native";
|
||||
|
||||
import { NOSTR_NSEC_KEY } from "@/constants/storage-keys";
|
||||
|
||||
// ---------------------------------------------------------------------------
|
||||
// Base64 helpers (no Buffer — uses standard JS globals)
|
||||
// ---------------------------------------------------------------------------
|
||||
|
||||
function utf8ToBase64(str: string): string {
|
||||
return btoa(
|
||||
encodeURIComponent(str).replace(
|
||||
/%([0-9A-F]{2})/g,
|
||||
(_, p1: string) => String.fromCharCode(parseInt(p1, 16))
|
||||
)
|
||||
);
|
||||
}
|
||||
|
||||
function base64ToUtf8(str: string): string {
|
||||
return decodeURIComponent(
|
||||
atob(str)
|
||||
.split("")
|
||||
.map((c) => "%" + c.charCodeAt(0).toString(16).padStart(2, "0"))
|
||||
.join("")
|
||||
);
|
||||
}
|
||||
|
||||
// ---------------------------------------------------------------------------
|
||||
// Minimal bech32 + secp256k1 helpers (pure JS, no native deps)
|
||||
// ---------------------------------------------------------------------------
|
||||
|
||||
const BECH32_CHARSET = "qpzry9x8gf2tvdw0s3jn54khce6mua7l";
|
||||
const BECH32_GENERATOR = [
|
||||
0x3b6a57b2, 0x26508e6d, 0x1ea119fa, 0x3d4233dd, 0x2a1462b3,
|
||||
];
|
||||
|
||||
function bech32Polymod(values: number[]): number {
|
||||
let chk = 1;
|
||||
for (const v of values) {
|
||||
const top = chk >> 25;
|
||||
chk = ((chk & 0x1ffffff) << 5) ^ v;
|
||||
for (let i = 0; i < 5; i++) {
|
||||
if ((top >> i) & 1) chk ^= BECH32_GENERATOR[i];
|
||||
}
|
||||
}
|
||||
return chk;
|
||||
}
|
||||
|
||||
function bech32HrpExpand(hrp: string): number[] {
|
||||
const ret: number[] = [];
|
||||
for (let i = 0; i < hrp.length; i++) ret.push(hrp.charCodeAt(i) >> 5);
|
||||
ret.push(0);
|
||||
for (let i = 0; i < hrp.length; i++) ret.push(hrp.charCodeAt(i) & 31);
|
||||
return ret;
|
||||
}
|
||||
|
||||
function bech32CreateChecksum(hrp: string, data: number[]): number[] {
|
||||
const values = bech32HrpExpand(hrp).concat(data).concat([0, 0, 0, 0, 0, 0]);
|
||||
const mod = bech32Polymod(values) ^ 1;
|
||||
const ret: number[] = [];
|
||||
for (let p = 0; p < 6; p++) ret.push((mod >> (5 * (5 - p))) & 31);
|
||||
return ret;
|
||||
}
|
||||
|
||||
function bech32Encode(hrp: string, data: number[]): string {
|
||||
const combined = data.concat(bech32CreateChecksum(hrp, data));
|
||||
let result = hrp + "1";
|
||||
for (const b of combined) result += BECH32_CHARSET[b];
|
||||
return result;
|
||||
}
|
||||
|
||||
function bech32Decode(str: string): { hrp: string; data: Uint8Array } | null {
|
||||
const lower = str.toLowerCase();
|
||||
const sep = lower.lastIndexOf("1");
|
||||
if (sep < 1 || sep + 7 > lower.length || lower.length > 90) return null;
|
||||
const hrp = lower.slice(0, sep);
|
||||
const data: number[] = [];
|
||||
for (let i = sep + 1; i < lower.length; i++) {
|
||||
const v = BECH32_CHARSET.indexOf(lower[i]);
|
||||
if (v === -1) return null;
|
||||
data.push(v);
|
||||
}
|
||||
if (bech32Polymod(bech32HrpExpand(hrp).concat(data)) !== 1) return null;
|
||||
return {
|
||||
hrp,
|
||||
data: new Uint8Array(convertBits(data.slice(0, -6), 5, 8, false)),
|
||||
};
|
||||
}
|
||||
|
||||
function convertBits(
|
||||
data: number[],
|
||||
fromBits: number,
|
||||
toBits: number,
|
||||
pad: boolean
|
||||
): number[] {
|
||||
let acc = 0;
|
||||
let bits = 0;
|
||||
const result: number[] = [];
|
||||
const maxv = (1 << toBits) - 1;
|
||||
for (const value of data) {
|
||||
if (value < 0 || value >> fromBits !== 0) throw new Error("Invalid value");
|
||||
acc = (acc << fromBits) | value;
|
||||
bits += fromBits;
|
||||
while (bits >= toBits) {
|
||||
bits -= toBits;
|
||||
result.push((acc >> bits) & maxv);
|
||||
}
|
||||
}
|
||||
if (pad && bits > 0) {
|
||||
result.push((acc << (toBits - bits)) & maxv);
|
||||
} else if (bits >= fromBits || ((acc << (toBits - bits)) & maxv)) {
|
||||
if (!pad && bits >= fromBits) throw new Error("Excessive padding");
|
||||
}
|
||||
return result;
|
||||
}
|
||||
|
||||
function bytesToHex(bytes: Uint8Array): string {
|
||||
return Array.from(bytes)
|
||||
.map((b) => b.toString(16).padStart(2, "0"))
|
||||
.join("");
|
||||
}
|
||||
|
||||
function hexToBytes(hex: string): Uint8Array {
|
||||
const bytes = new Uint8Array(hex.length / 2);
|
||||
for (let i = 0; i < hex.length; i += 2)
|
||||
bytes[i / 2] = parseInt(hex.slice(i, i + 2), 16);
|
||||
return bytes;
|
||||
}
|
||||
|
||||
// Minimal secp256k1 x-only public key derivation via BigInt
|
||||
const P =
|
||||
0xfffffffffffffffffffffffffffffffffffffffffffffffffffffffefffffc2fn;
|
||||
const Gx =
|
||||
0x79be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798n;
|
||||
const Gy =
|
||||
0x483ada7726a3c4655da4fbfc0e1108a8fd17b448a68554199c47d08ffb10d4b8n;
|
||||
|
||||
type Point = { x: bigint; y: bigint } | null;
|
||||
|
||||
function modPow(base: bigint, exp: bigint, mod: bigint): bigint {
|
||||
let result = 1n;
|
||||
base = base % mod;
|
||||
while (exp > 0n) {
|
||||
if (exp % 2n === 1n) result = (result * base) % mod;
|
||||
exp = exp / 2n;
|
||||
base = (base * base) % mod;
|
||||
}
|
||||
return result;
|
||||
}
|
||||
|
||||
function pointAdd(p1: Point, p2: Point): Point {
|
||||
if (p1 === null) return p2;
|
||||
if (p2 === null) return p1;
|
||||
if (p1.x === p2.x) {
|
||||
if (p1.y !== p2.y) return null;
|
||||
const lam = (3n * p1.x * p1.x * modPow(2n * p1.y, P - 2n, P)) % P;
|
||||
const x = (lam * lam - 2n * p1.x + P + P) % P;
|
||||
const y = (lam * (p1.x - x) - p1.y + P * 2n) % P;
|
||||
return { x, y };
|
||||
}
|
||||
const lam =
|
||||
((p2.y - p1.y + P * 2n) % P) *
|
||||
modPow((p2.x - p1.x + P) % P, P - 2n, P) %
|
||||
P;
|
||||
const x = (lam * lam - p1.x - p2.x + P * 4n) % P;
|
||||
const y = (lam * (p1.x - x) - p1.y + P * 4n) % P;
|
||||
return { x, y };
|
||||
}
|
||||
|
||||
function scalarMul(k: bigint): Point {
|
||||
let result: Point = null;
|
||||
let addend: Point = { x: Gx, y: Gy };
|
||||
while (k > 0n) {
|
||||
if (k % 2n === 1n) result = pointAdd(result, addend);
|
||||
addend = pointAdd(addend, addend);
|
||||
k >>= 1n;
|
||||
}
|
||||
return result;
|
||||
}
|
||||
|
||||
function privateKeyToPublicKeyHex(privKeyBytes: Uint8Array): string {
|
||||
const k = BigInt("0x" + bytesToHex(privKeyBytes));
|
||||
const point = scalarMul(k);
|
||||
if (!point) throw new Error("Invalid private key");
|
||||
return point.x.toString(16).padStart(64, "0");
|
||||
}
|
||||
|
||||
function nsecToNpub(nsec: string): string {
|
||||
const decoded = bech32Decode(nsec);
|
||||
if (!decoded || decoded.hrp !== "nsec")
|
||||
throw new Error("Invalid nsec encoding");
|
||||
const pubkeyHex = privateKeyToPublicKeyHex(decoded.data);
|
||||
const pubkeyBytes = hexToBytes(pubkeyHex);
|
||||
const data5bit = convertBits(Array.from(pubkeyBytes), 8, 5, true);
|
||||
return bech32Encode("npub", data5bit);
|
||||
}
|
||||
|
||||
// ---------------------------------------------------------------------------
|
||||
// NIP-55 Amber helpers (Android only)
|
||||
// ---------------------------------------------------------------------------
|
||||
|
||||
const AMBER_SCHEME = "nostrsigner:";
|
||||
export const AMBER_PACKAGE = "com.greenart7c3.nostrsigner";
|
||||
|
||||
export type NostrEvent = {
|
||||
kind: number;
|
||||
content: string;
|
||||
tags: string[][];
|
||||
created_at: number;
|
||||
pubkey?: string;
|
||||
};
|
||||
|
||||
type PendingSign = {
|
||||
resolve: (event: NostrEvent) => void;
|
||||
reject: (err: Error) => void;
|
||||
};
|
||||
|
||||
function buildAmberSignUrl(event: NostrEvent, callbackUrl: string): string {
|
||||
const payload = JSON.stringify(event);
|
||||
const encoded = utf8ToBase64(payload);
|
||||
return (
|
||||
`${AMBER_SCHEME}${encodeURIComponent(encoded)}` +
|
||||
`?compressionType=none&returnType=event&type=sign_event` +
|
||||
`&callbackUrl=${encodeURIComponent(callbackUrl)}`
|
||||
);
|
||||
}
|
||||
|
||||
export async function isAmberInstalled(): Promise<boolean> {
|
||||
if (Platform.OS !== "android") return false;
|
||||
try {
|
||||
return await Linking.canOpenURL(AMBER_SCHEME);
|
||||
} catch {
|
||||
return false;
|
||||
}
|
||||
}
|
||||
|
||||
// ---------------------------------------------------------------------------
|
||||
// Context types
|
||||
// ---------------------------------------------------------------------------
|
||||
|
||||
export type SigningMethod = "amber" | "nsec";
|
||||
|
||||
type NostrIdentityContextValue = {
|
||||
/** Bech32 npub, or null when no identity is connected. */
|
||||
npub: string | null;
|
||||
isConnected: boolean;
|
||||
/** How the identity was connected (null = not connected). */
|
||||
signingMethod: SigningMethod | null;
|
||||
amberAvailable: boolean;
|
||||
/** Connect using a raw nsec string. Throws on invalid input. */
|
||||
connectWithNsec: (nsec: string) => Promise<void>;
|
||||
/** Connect via Amber (Android only). Stores npub; signing delegates to Amber. */
|
||||
connectWithAmber: () => Promise<void>;
|
||||
/** Wipe the key from SecureStore and reset identity state. */
|
||||
disconnect: () => Promise<void>;
|
||||
/**
|
||||
* Sign a Nostr event.
|
||||
* - nsec method: adds pubkey attribution using the stored key.
|
||||
* - Amber method: deep-links to Amber and awaits the callback.
|
||||
*/
|
||||
signEvent: (event: NostrEvent) => Promise<NostrEvent>;
|
||||
};
|
||||
|
||||
const NostrIdentityContext = createContext<NostrIdentityContextValue | null>(
|
||||
null
|
||||
);
|
||||
|
||||
// ---------------------------------------------------------------------------
|
||||
// Provider
|
||||
// ---------------------------------------------------------------------------
|
||||
|
||||
export function NostrIdentityProvider({
|
||||
children,
|
||||
}: {
|
||||
children: React.ReactNode;
|
||||
}) {
|
||||
const [npub, setNpub] = useState<string | null>(null);
|
||||
const [signingMethod, setSigningMethod] = useState<SigningMethod | null>(
|
||||
null
|
||||
);
|
||||
const [amberAvailable, setAmberAvailable] = useState(false);
|
||||
const pendingSignRef = useRef<PendingSign | null>(null);
|
||||
|
||||
// Check for Amber on mount (Android only)
|
||||
useEffect(() => {
|
||||
isAmberInstalled().then(setAmberAvailable);
|
||||
}, []);
|
||||
|
||||
// Load persisted identity on mount
|
||||
useEffect(() => {
|
||||
(async () => {
|
||||
try {
|
||||
const stored = await SecureStore.getItemAsync(NOSTR_NSEC_KEY);
|
||||
if (!stored) return;
|
||||
const parsed: { nsec?: string; method?: SigningMethod } =
|
||||
JSON.parse(stored);
|
||||
if (parsed.nsec && parsed.method) {
|
||||
// For nsec method, re-derive npub. For amber, stored value IS the npub.
|
||||
const derivedNpub =
|
||||
parsed.method === "nsec"
|
||||
? nsecToNpub(parsed.nsec)
|
||||
: parsed.nsec;
|
||||
setNpub(derivedNpub);
|
||||
setSigningMethod(parsed.method);
|
||||
}
|
||||
} catch {
|
||||
// Corrupted or missing — silently ignore
|
||||
}
|
||||
})();
|
||||
}, []);
|
||||
|
||||
// Handle Amber callback deep link (used for sign_event responses)
|
||||
useEffect(() => {
|
||||
const handleUrl = ({ url }: { url: string }) => {
|
||||
if (!url.includes("amber-callback")) return;
|
||||
const parsed = Linking.parse(url);
|
||||
const eventParam =
|
||||
typeof parsed.queryParams?.event === "string"
|
||||
? parsed.queryParams.event
|
||||
: null;
|
||||
if (!eventParam || !pendingSignRef.current) return;
|
||||
try {
|
||||
const decoded = base64ToUtf8(decodeURIComponent(eventParam));
|
||||
const signedEvent: NostrEvent = JSON.parse(decoded);
|
||||
pendingSignRef.current.resolve(signedEvent);
|
||||
} catch (err) {
|
||||
pendingSignRef.current.reject(
|
||||
err instanceof Error
|
||||
? err
|
||||
: new Error("Failed to parse Amber response")
|
||||
);
|
||||
} finally {
|
||||
pendingSignRef.current = null;
|
||||
}
|
||||
};
|
||||
|
||||
const sub = Linking.addEventListener("url", handleUrl);
|
||||
return () => sub.remove();
|
||||
}, []);
|
||||
|
||||
const connectWithNsec = useCallback(async (nsec: string) => {
|
||||
const trimmed = nsec.trim();
|
||||
// Validate and derive npub (throws on invalid key)
|
||||
const derivedNpub = nsecToNpub(trimmed);
|
||||
// Persist: store nsec for local signing capability
|
||||
await SecureStore.setItemAsync(
|
||||
NOSTR_NSEC_KEY,
|
||||
JSON.stringify({ nsec: trimmed, method: "nsec" satisfies SigningMethod })
|
||||
);
|
||||
setNpub(derivedNpub);
|
||||
setSigningMethod("nsec");
|
||||
}, []);
|
||||
|
||||
const connectWithAmber = useCallback(async () => {
|
||||
if (Platform.OS !== "android") {
|
||||
throw new Error("Amber is only available on Android");
|
||||
}
|
||||
if (!(await isAmberInstalled())) {
|
||||
throw new Error("Amber is not installed");
|
||||
}
|
||||
// Request npub from Amber via NIP-55 get_public_key
|
||||
const callbackUrl = Linking.createURL("amber-callback");
|
||||
const url =
|
||||
`${AMBER_SCHEME}?type=get_public_key` +
|
||||
`&callbackUrl=${encodeURIComponent(callbackUrl)}`;
|
||||
|
||||
const npubResult = await new Promise<string>((resolve, reject) => {
|
||||
const handle: { sub: ReturnType<typeof Linking.addEventListener> | null } =
|
||||
{ sub: null };
|
||||
|
||||
const timeout = setTimeout(() => {
|
||||
handle.sub?.remove();
|
||||
reject(new Error("Amber did not respond in time"));
|
||||
}, 60_000);
|
||||
|
||||
handle.sub = Linking.addEventListener("url", ({ url: incomingUrl }) => {
|
||||
if (!incomingUrl.includes("amber-callback")) return;
|
||||
clearTimeout(timeout);
|
||||
handle.sub?.remove();
|
||||
try {
|
||||
const parsed = Linking.parse(incomingUrl);
|
||||
const npubParam =
|
||||
typeof parsed.queryParams?.npub === "string"
|
||||
? parsed.queryParams.npub
|
||||
: null;
|
||||
if (!npubParam) reject(new Error("Amber did not return an npub"));
|
||||
else resolve(npubParam);
|
||||
} catch (err) {
|
||||
reject(
|
||||
err instanceof Error
|
||||
? err
|
||||
: new Error("Failed to parse Amber response")
|
||||
);
|
||||
}
|
||||
});
|
||||
|
||||
Linking.openURL(url).catch((err) => {
|
||||
clearTimeout(timeout);
|
||||
handle.sub?.remove();
|
||||
reject(err);
|
||||
});
|
||||
});
|
||||
|
||||
// Store npub (no raw key — Amber holds it)
|
||||
await SecureStore.setItemAsync(
|
||||
NOSTR_NSEC_KEY,
|
||||
JSON.stringify({
|
||||
nsec: npubResult,
|
||||
method: "amber" satisfies SigningMethod,
|
||||
})
|
||||
);
|
||||
setNpub(npubResult);
|
||||
setSigningMethod("amber");
|
||||
}, []);
|
||||
|
||||
const disconnect = useCallback(async () => {
|
||||
await SecureStore.deleteItemAsync(NOSTR_NSEC_KEY);
|
||||
setNpub(null);
|
||||
setSigningMethod(null);
|
||||
pendingSignRef.current?.reject(new Error("Disconnected"));
|
||||
pendingSignRef.current = null;
|
||||
}, []);
|
||||
|
||||
const signEvent = useCallback(
|
||||
async (event: NostrEvent): Promise<NostrEvent> => {
|
||||
if (!signingMethod) throw new Error("No Nostr identity connected");
|
||||
|
||||
if (signingMethod === "amber") {
|
||||
if (Platform.OS !== "android")
|
||||
throw new Error("Amber signing is Android-only");
|
||||
if (pendingSignRef.current)
|
||||
throw new Error("A signing request is already in progress");
|
||||
|
||||
const callbackUrl = Linking.createURL("amber-callback");
|
||||
const amberUrl = buildAmberSignUrl(event, callbackUrl);
|
||||
|
||||
return new Promise<NostrEvent>((resolve, reject) => {
|
||||
const timeout = setTimeout(() => {
|
||||
if (pendingSignRef.current) {
|
||||
pendingSignRef.current = null;
|
||||
reject(new Error("Amber signing timed out"));
|
||||
}
|
||||
}, 60_000);
|
||||
|
||||
pendingSignRef.current = {
|
||||
resolve: (signed) => {
|
||||
clearTimeout(timeout);
|
||||
resolve(signed);
|
||||
},
|
||||
reject: (err) => {
|
||||
clearTimeout(timeout);
|
||||
reject(err);
|
||||
},
|
||||
};
|
||||
|
||||
Linking.openURL(amberUrl).catch((err) => {
|
||||
clearTimeout(timeout);
|
||||
pendingSignRef.current = null;
|
||||
reject(err);
|
||||
});
|
||||
});
|
||||
}
|
||||
|
||||
// nsec path — load key from SecureStore and set pubkey attribution
|
||||
const stored = await SecureStore.getItemAsync(NOSTR_NSEC_KEY);
|
||||
if (!stored) throw new Error("Key not found in SecureStore");
|
||||
const { nsec: storedNsec } = JSON.parse(stored) as {
|
||||
nsec: string;
|
||||
method: string;
|
||||
};
|
||||
const decoded = bech32Decode(storedNsec);
|
||||
if (!decoded || decoded.hrp !== "nsec")
|
||||
throw new Error("Invalid stored nsec");
|
||||
const pubkeyHex = privateKeyToPublicKeyHex(decoded.data);
|
||||
return { ...event, pubkey: pubkeyHex };
|
||||
},
|
||||
[signingMethod]
|
||||
);
|
||||
|
||||
const value = useMemo<NostrIdentityContextValue>(
|
||||
() => ({
|
||||
npub,
|
||||
isConnected: npub !== null,
|
||||
signingMethod,
|
||||
amberAvailable,
|
||||
connectWithNsec,
|
||||
connectWithAmber,
|
||||
disconnect,
|
||||
signEvent,
|
||||
}),
|
||||
[
|
||||
npub,
|
||||
signingMethod,
|
||||
amberAvailable,
|
||||
connectWithNsec,
|
||||
connectWithAmber,
|
||||
disconnect,
|
||||
signEvent,
|
||||
]
|
||||
);
|
||||
|
||||
return (
|
||||
<NostrIdentityContext.Provider value={value}>
|
||||
{children}
|
||||
</NostrIdentityContext.Provider>
|
||||
);
|
||||
}
|
||||
|
||||
export function useNostrIdentity() {
|
||||
const ctx = useContext(NostrIdentityContext);
|
||||
if (!ctx)
|
||||
throw new Error(
|
||||
"useNostrIdentity must be used within NostrIdentityProvider"
|
||||
);
|
||||
return ctx;
|
||||
}
|
||||
|
||||
/** Truncates an npub for display, e.g. "npub1abc...xyz" */
|
||||
export function truncateNpub(npub: string, headLen = 10, tailLen = 6): string {
|
||||
if (npub.length <= headLen + tailLen + 3) return npub;
|
||||
return `${npub.slice(0, headLen)}...${npub.slice(-tailLen)}`;
|
||||
}
|
||||
@@ -25,6 +25,7 @@
|
||||
"babel-plugin-react-compiler": "^19.0.0-beta-e993439-20250117",
|
||||
"expo": "~54.0.27",
|
||||
"expo-blur": "~15.0.8",
|
||||
"expo-secure-store": "~14.0.1",
|
||||
"expo-constants": "~18.0.11",
|
||||
"expo-font": "~14.0.10",
|
||||
"expo-glass-effect": "~0.1.4",
|
||||
|
||||
Reference in New Issue
Block a user