add signal online searching

src/app/signal/scan.tsx

@@ -1,5 +1,5 @@
 import { useEffect, useMemo, useRef, useState } from 'react';
-import { Pressable, StyleSheet, View } from 'react-native';
+import { Linking, Pressable, StyleSheet, View } from 'react-native';
 import { CameraView, useCameraPermissions } from 'expo-camera';
 import * as DocumentPicker from 'expo-document-picker';
 import { Ionicons } from '@expo/vector-icons';
@@ -17,6 +17,7 @@ import {
 import { decodeSignalFromUri } from '@/audio/signalDecodeImage';
 import { matchSignalToLibrary } from '@/audio/signalLocalMatch';
 import { SIGNAL_SCAN_GUIDE } from '@/audio/signalScanGeometry';
+import { encodeSignalWebUrl } from '@/audio/signalShare';
 import { enqueueEnd, playTracks } from '@/audio/playbackController';
 import { dbTrackToTrack } from '@/library/trackAdapter';
 import { playHaptic } from '@/lib/haptics';
@@ -26,7 +27,7 @@ import { createThemedStyles, useColors } from '@/theme/themed';
 import { useRipple } from '@/theme/ripple';
 import type { SignalPayload } from '@boof2015/astra-signal';
 
-const MIN_READING_MS = 600;
+const MIN_READING_MS = 300;
 const FAILURE_RETURN_MS = 480;
 
 export default function SignalScanScreen() {
@@ -151,6 +152,16 @@ export default function SignalScanScreen() {
     }
   };
 
+  const findOnline = async (payload: SignalPayload) => {
+    playHaptic('action');
+    setActionError(null);
+    try {
+      await Linking.openURL(encodeSignalWebUrl(payload));
+    } catch {
+      setActionError("Couldn't open the online Signal lookup.");
+    }
+  };
+
   const standaloneResult = result !== null && !permission?.granted;
   const resultContent = result ? (
     <SignalResolutionPanel
@@ -160,6 +171,7 @@ export default function SignalScanScreen() {
       actionError={actionError}
       onPlay={(track) => void playMatchedTrack(track)}
       onQueue={(track) => void queueMatchedTrack(track)}
+      onFindOnline={() => void findOnline(result)}
       onScanAnother={scanAnother}
       onDone={() => router.back()}
     />

src/audio/signalDecodeImage.ts

@@ -1,4 +1,4 @@
-import { EncodingType, readAsStringAsync } from 'expo-file-system/legacy';
+import { File } from 'expo-file-system';
 import { AlphaType, ColorType, Skia, rect, type SkImage } from '@shopify/react-native-skia';
 import {
   decodeSignalImage,
@@ -66,8 +66,8 @@ export async function decodeSignalFromUri(
   uri: string,
   options: DecodeSignalFromUriOptions = {}
 ): Promise<SignalPayload> {
-  const b64 = await readAsStringAsync(uri, { encoding: EncodingType.Base64 });
-  const encoded = Skia.Data.fromBase64(b64);
+  const bytes = await new File(uri).bytes();
+  const encoded = Skia.Data.fromBytes(bytes);
   const source = Skia.Image.MakeImageFromEncoded(encoded);
   encoded.dispose();
   if (!source) throw new Error('Could not read that image.');

src/audio/signalShare.test.mts

@@ -4,6 +4,7 @@ import type { Track } from '../types/audio.ts';
 import {
   SIGNAL_LINK_PREFIX,
   decodeTrackSignalLink,
+  encodeSignalWebUrl,
   encodeTrackSignalLink,
   signalInputFromTrack,
   signalLayoutFromTrack,
@@ -62,6 +63,19 @@ test('preserves ASCII case and punctuation in track metadata', () => {
   });
 });
 
+test('builds a web resolver URL with the complete Signal in the fragment', () => {
+  const url = encodeSignalWebUrl({ artist: 'ナナツカゼ', title: 'Replay!', durationSec: 201 });
+  assert.match(url, /^https:\/\/astramusic\.dev\/signal\/#astra:signal:v3:/);
+  const signalLink = new URL(url).hash.slice(1);
+  assert.deepEqual(decodeTrackSignalLink(signalLink), {
+    version: 3,
+    type: 'metadata',
+    artist: 'ナナツカゼ',
+    title: 'Replay!',
+    durationSec: 201,
+  });
+});
+
 test('rejects non-v3, malformed, and CRC-corrupted links', () => {
   assert.throws(() => decodeTrackSignalLink('astra:signal:v2:AAAA'), /v3 link/);
   assert.throws(() => decodeTrackSignalLink(`${SIGNAL_LINK_PREFIX}%`));

src/audio/signalShare.ts

@@ -11,6 +11,8 @@ import type { Track } from '../types/audio';
 
 export { SIGNAL_LINK_PREFIX };
 
+export const SIGNAL_WEB_URL = 'https://astramusic.dev/signal/';
+
 /** Convert local track metadata into the database-free v3 Signal input. */
 export function signalInputFromTrack(track: Track): SignalInput {
   return {
@@ -30,6 +32,11 @@ export function encodeTrackSignalLink(track: Track): string {
   return encodeLibrarySignalLink(signalInputFromTrack(track));
 }
 
+/** Build the privacy-preserving web resolver URL. The Signal stays in the fragment. */
+export function encodeSignalWebUrl(input: SignalInput): string {
+  return `${SIGNAL_WEB_URL}#${encodeLibrarySignalLink(input)}`;
+}
+
 export function decodeTrackSignalLink(value: string): SignalPayload {
   return decodeLibrarySignalLink(value);
 }

src/components/signal/SignalResolutionPanel.tsx

@@ -19,6 +19,7 @@ interface SignalResolutionPanelProps {
   actionError: string | null;
   onPlay: (track: DbTrack) => void;
   onQueue: (track: DbTrack) => void;
+  onFindOnline: () => void;
   onScanAnother: () => void;
   onDone: () => void;
 }
@@ -30,6 +31,7 @@ export function SignalResolutionPanel({
   actionError,
   onPlay,
   onQueue,
+  onFindOnline,
   onScanAnother,
   onDone,
 }: SignalResolutionPanelProps) {
@@ -38,6 +40,29 @@ export function SignalResolutionPanel({
   const ripple = useRipple();
   const actionBusy = actionState === 'playing' || actionState === 'queueing';
 
+  const onlineAction = (primary = false) => (
+    <Pressable
+      android_ripple={ripple.bounded}
+      style={[
+        styles.onlineButton,
+        primary ? styles.onlineButtonPrimary : styles.onlineButtonSecondary,
+        actionBusy && styles.disabledButton,
+      ]}
+      onPress={onFindOnline}
+      disabled={actionBusy}
+      accessibilityRole="button"
+    >
+      <Ionicons
+        name="open-outline"
+        size={18}
+        color={primary ? colors.accentTextStrong : colors.textPrimary}
+      />
+      <Text variant="body" color={primary ? colors.accentTextStrong : colors.textPrimary}>
+        Find online
+      </Text>
+    </Pressable>
+  );
+
   const footer = (
     <View style={styles.footerActions}>
       <Pressable
@@ -90,6 +115,12 @@ export function SignalResolutionPanel({
             </Text>
           </View>
         </View>
+        {onlineAction(true)}
+        {actionError ? (
+          <Text variant="label" color={colors.warning} style={styles.centerCopy}>
+            {actionError}
+          </Text>
+        ) : null}
         {footer}
       </View>
     );
@@ -132,6 +163,7 @@ export function SignalResolutionPanel({
             {actionError}
           </Text>
         ) : null}
+        {onlineAction()}
         {footer}
       </View>
     );
@@ -194,6 +226,8 @@ export function SignalResolutionPanel({
         </Pressable>
       </View>
 
+      {onlineAction()}
+
       {actionError ? (
         <Text variant="label" color={colors.warning} style={styles.centerCopy}>
           {actionError}
@@ -264,6 +298,23 @@ const useStyles = createThemedStyles((colors) => ({
     flexDirection: 'row',
     gap: spacing.sm,
   },
+  onlineButton: {
+    minHeight: 46,
+    flexDirection: 'row',
+    alignItems: 'center',
+    justifyContent: 'center',
+    gap: spacing.sm,
+    paddingHorizontal: spacing.md,
+    borderRadius: radius.sm,
+  },
+  onlineButtonPrimary: {
+    backgroundColor: colors.accent,
+  },
+  onlineButtonSecondary: {
+    borderWidth: StyleSheet.hairlineWidth,
+    borderColor: colors.glassBorder,
+    backgroundColor: colors.bgSecondary,
+  },
   primaryButton: {
     minHeight: 48,
     flex: 1,