android/app/build.gradle.kts

@@ -1,9 +1,23 @@
+import java.util.Properties
+import java.io.FileInputStream
+
 plugins {
     id("com.android.application")
     // The Flutter Gradle Plugin must be applied after the Android and Kotlin Gradle plugins.
     id("dev.flutter.flutter-gradle-plugin")
 }
 
+// Release signing is read from android/key.properties (kept out of version
+// control). When it is absent we fall back to the debug key so that
+// `flutter run --release` keeps working during development — but a build meant
+// for distribution must provide a real keystore here.
+val keystoreProperties = Properties()
+val keystorePropertiesFile = rootProject.file("key.properties")
+val hasReleaseKeystore = keystorePropertiesFile.exists()
+if (hasReleaseKeystore) {
+    keystoreProperties.load(FileInputStream(keystorePropertiesFile))
+}
+
 android {
     namespace = "com.example.ocideck"
     compileSdk = flutter.compileSdkVersion
@@ -25,11 +39,27 @@ android {
         versionName = flutter.versionName
     }
 
+    signingConfigs {
+        if (hasReleaseKeystore) {
+            create("release") {
+                keyAlias = keystoreProperties["keyAlias"] as String
+                keyPassword = keystoreProperties["keyPassword"] as String
+                storeFile = file(keystoreProperties["storeFile"] as String)
+                storePassword = keystoreProperties["storePassword"] as String
+            }
+        }
+    }
+
     buildTypes {
         release {
-            // TODO: Add your own signing config for the release build.
-            // Signing with the debug keys for now, so `flutter run --release` works.
-            signingConfig = signingConfigs.getByName("debug")
+            // Use the real release keystore when configured; otherwise fall back
+            // to the debug key so `flutter run --release` still works locally.
+            // Do NOT distribute a build signed with the debug key.
+            signingConfig = if (hasReleaseKeystore) {
+                signingConfigs.getByName("release")
+            } else {
+                signingConfigs.getByName("debug")
+            }
         }
     }
 }

lib/state/consent_provider.dart

@@ -1,10 +1,10 @@
+import 'package:flutter/foundation.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 
 const _consentKey = 'app_consent_accepted';
 
-final consentProvider =
-    NotifierProvider<ConsentNotifier, ConsentState>(() {
+final consentProvider = NotifierProvider<ConsentNotifier, ConsentState>(() {
   return ConsentNotifier();
 });
 
@@ -12,15 +12,9 @@ class ConsentState {
   final bool hasAccepted;
   final bool isLoading;
 
-  const ConsentState({
-    required this.hasAccepted,
-    this.isLoading = false,
-  });
+  const ConsentState({required this.hasAccepted, this.isLoading = false});
 
-  ConsentState copyWith({
-    bool? hasAccepted,
-    bool? isLoading,
-  }) {
+  ConsentState copyWith({bool? hasAccepted, bool? isLoading}) {
     return ConsentState(
       hasAccepted: hasAccepted ?? this.hasAccepted,
       isLoading: isLoading ?? this.isLoading,
@@ -41,6 +35,8 @@ class ConsentNotifier extends Notifier<ConsentState> {
       final hasAccepted = prefs.getBool(_consentKey) ?? false;
       state = state.copyWith(hasAccepted: hasAccepted, isLoading: false);
     } catch (e) {
+      // Can't read the flag: fail closed (gate stays up) but don't hang loading.
+      debugPrint('ConsentNotifier: could not read consent flag: $e');
       state = state.copyWith(isLoading: false);
     }
   }
@@ -51,6 +47,9 @@ class ConsentNotifier extends Notifier<ConsentState> {
       await prefs.setBool(_consentKey, true);
       state = state.copyWith(hasAccepted: true);
     } catch (e) {
+      // Persisting failed; let the user through this session, but the gate will
+      // reappear next launch. Surface the failure instead of swallowing it.
+      debugPrint('ConsentNotifier: could not persist consent: $e');
       state = state.copyWith(hasAccepted: true);
     }
   }
@@ -61,6 +60,7 @@ class ConsentNotifier extends Notifier<ConsentState> {
       await prefs.setBool(_consentKey, false);
       state = state.copyWith(hasAccepted: false);
     } catch (e) {
+      debugPrint('ConsentNotifier: could not persist consent revocation: $e');
       state = state.copyWith(hasAccepted: false);
     }
   }

lib/state/deck_provider.dart

@@ -201,7 +201,12 @@ class DeckNotifier extends StateNotifier<DeckState> {
 
   void removeSlide(int index) {
     final deck = state.deck;
-    if (deck == null || deck.slides.length <= 1) return;
+    if (deck == null ||
+        deck.slides.length <= 1 ||
+        index < 0 ||
+        index >= deck.slides.length) {
+      return;
+    }
     final slides = List<Slide>.from(deck.slides)..removeAt(index);
     _mutate(deck.copyWith(slides: slides));
   }
@@ -254,7 +259,7 @@ class DeckNotifier extends StateNotifier<DeckState> {
 
   void duplicateSlide(int index) {
     final deck = state.deck;
-    if (deck == null) return;
+    if (deck == null || index < 0 || index >= deck.slides.length) return;
     final slides = List<Slide>.from(deck.slides);
     slides.insert(index + 1, Slide.duplicate(slides[index]));
     _mutate(deck.copyWith(slides: slides));
@@ -272,7 +277,7 @@ class DeckNotifier extends StateNotifier<DeckState> {
 
   void updateSlide(int index, Slide updated) {
     final deck = state.deck;
-    if (deck == null) return;
+    if (deck == null || index < 0 || index >= deck.slides.length) return;
     final slides = List<Slide>.from(deck.slides);
     slides[index] = updated;
     // Snel typen op dezelfde slide telt als één ongedaan-maken-stap.
@@ -393,6 +398,9 @@ class DeckNotifier extends StateNotifier<DeckState> {
           title: sub(s.title),
           subtitle: sub(s.subtitle),
           bullets: [for (final b in s.bullets) sub(b)],
+          bullets2: [for (final b in s.bullets2) sub(b)],
+          columnTitle1: sub(s.columnTitle1),
+          columnTitle2: sub(s.columnTitle2),
           quote: sub(s.quote),
           quoteAuthor: sub(s.quoteAuthor),
           customMarkdown: sub(s.customMarkdown),
@@ -414,6 +422,9 @@ class DeckNotifier extends StateNotifier<DeckState> {
     s.title,
     s.subtitle,
     ...s.bullets,
+    ...s.bullets2,
+    s.columnTitle1,
+    s.columnTitle2,
     s.quote,
     s.quoteAuthor,
     s.customMarkdown,

lib/state/tabs_provider.dart

@@ -101,9 +101,26 @@ class TabsNotifier extends StateNotifier<TabsState> {
     for (final sub in _subs.values) {
       sub.cancel();
     }
+    // The tabs' notifiers are not disposed here: at teardown the widget tree is
+    // still unmounting and may read a tab one last time. The process is ending
+    // anyway. The per-close path (_disposeTab) is what prevents the real leak.
     super.dispose();
   }
 
+  /// Tear down a tab that is being removed: stop listening to it and dispose
+  /// its notifiers so their listeners and undo/redo history are released. The
+  /// dispose is deferred to a microtask so any widget still referencing this
+  /// tab while it unmounts has finished before the notifiers go away.
+  void _disposeTab(TabInfo tab) {
+    _subs.remove(tab.id)?.cancel();
+    final deckNotifier = tab.deckNotifier;
+    final editorNotifier = tab.editorNotifier;
+    Future.microtask(() {
+      deckNotifier.dispose();
+      editorNotifier.dispose();
+    });
+  }
+
   TabInfo _createTab() {
     final id = _nextId++;
     final recoveryId = _uuid.v4();
@@ -163,7 +180,7 @@ class TabsNotifier extends StateNotifier<TabsState> {
     // Een ongebruikt leeg begin-tabblad vervangen, anders toevoegen.
     final replaceEmpty = state.tabs.length == 1 && !state.tabs.first.isOpen;
     if (replaceEmpty) {
-      _subs.remove(state.tabs.first.id)?.cancel();
+      _disposeTab(state.tabs.first);
       state = state.copyWith(tabs: restored, selectedIndex: 0);
     } else {
       final tabs = [...state.tabs, ...restored];
@@ -282,7 +299,7 @@ class TabsNotifier extends StateNotifier<TabsState> {
     }
     final tab = state.tabs[index];
     _recovery.discard(tab.recoveryId);
-    _subs.remove(tab.id)?.cancel();
+    _disposeTab(tab);
     final newTabs = List<TabInfo>.from(state.tabs)..removeAt(index);
     final newSelected = index >= newTabs.length ? newTabs.length - 1 : index;
     state = state.copyWith(tabs: newTabs, selectedIndex: newSelected);

test/deck_provider_test.dart

@@ -166,7 +166,9 @@ void main() {
     expect(n.state.revision, greaterThan(revisionBefore));
   });
 
-  test('clearAllChecklists is a single undoable step that restores the checks', () {
+  test(
+    'clearAllChecklists is a single undoable step that restores the checks',
+    () {
       final n = _notifier()..newDeck('D');
       final slide = Slide.create(SlideType.bullets).copyWith(
         listStyle: ListStyle.checklist,
@@ -189,14 +191,14 @@ void main() {
       expect(n.state.deck!.slides.first.bullets2, ['[x] Tweede']);
       // ...and bumps the revision again so the open editor reflects the restore.
       expect(n.state.revision, greaterThan(revisionAfterClear));
-  });
+    },
+  );
 
   test('clearAllChecklists is a no-op when nothing is checked', () {
     final n = _notifier()..newDeck('D');
-    final slide = Slide.create(SlideType.bullets).copyWith(
-      listStyle: ListStyle.checklist,
-      bullets: ['[ ] Open'],
-    );
+    final slide = Slide.create(
+      SlideType.bullets,
+    ).copyWith(listStyle: ListStyle.checklist, bullets: ['[ ] Open']);
     n.loadDeck(n.state.deck!.copyWith(slides: [slide]));
     expect(n.state.canUndo, isFalse);
 
@@ -472,4 +474,31 @@ void main() {
     n.undo(); // één stap terug herstelt de hele vervanging
     expect(n.state.deck!.slides.first.title, 'Hallo wereld');
   });
+
+  test('find and replace covers the second column and both column titles', () {
+    final n = _notifier();
+    n.loadDeck(
+      Deck(
+        title: 'D',
+        slides: [
+          Slide.create(SlideType.twoBullets).copyWith(
+            title: 'foo title',
+            columnTitle1: 'foo left',
+            columnTitle2: 'foo right',
+            bullets: ['foo a'],
+            bullets2: ['foo b', 'foo c'],
+          ),
+        ],
+      ),
+    );
+
+    // title + columnTitle1 + columnTitle2 + bullets(1) + bullets2(2) = 6
+    expect(n.countMatches('foo'), 6);
+    expect(n.replaceAll('foo', 'bar'), 6);
+
+    final s = n.state.deck!.slides.first;
+    expect(s.columnTitle1, 'bar left');
+    expect(s.columnTitle2, 'bar right');
+    expect(s.bullets2, ['bar b', 'bar c']);
+  });
 }

test/file_service_test.dart

@@ -1,5 +1,7 @@
+import 'dart:convert';
 import 'dart:io';
 
+import 'package:archive/archive.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:ocideck/models/deck.dart';
 import 'package:ocideck/models/settings.dart';
@@ -62,4 +64,67 @@ void main() {
       expect(service.currentThemeProfile.logoPath, logo.path);
     },
   );
+
+  test(
+    'importPackageBytes ignores path-traversal entries (zip slip)',
+    () async {
+      final temp = await Directory.systemTemp.createTemp('ocideck_zipslip_');
+      addTearDown(() async {
+        if (await temp.exists()) await temp.delete(recursive: true);
+      });
+
+      final archive = Archive();
+      final md = utf8.encode('---\nmarp: true\n---\n# Hi');
+      archive.addFile(ArchiveFile('deck.md', md.length, md));
+      final evil = utf8.encode('pwned');
+      archive.addFile(ArchiveFile('../evil.txt', evil.length, evil));
+      final zipBytes = ZipEncoder().encode(archive);
+
+      final service = FileService(
+        MarkdownService(),
+        ImageService(),
+        () => const ThemeProfile(),
+      );
+      final mdPath = await service.importPackageBytes(zipBytes, temp.path);
+
+      // The traversal entry must not have escaped the extraction folder.
+      expect(await File(p.join(temp.path, 'evil.txt')).exists(), isFalse);
+      // The legitimate markdown landed inside it.
+      expect(mdPath, isNotNull);
+      expect(p.isWithin(temp.path, mdPath!), isTrue);
+      expect(await File(mdPath).exists(), isTrue);
+    },
+  );
+
+  test(
+    'importFromUrl refuses non-web schemes and private/loopback hosts',
+    () async {
+      final temp = await Directory.systemTemp.createTemp('ocideck_ssrf_');
+      addTearDown(() async {
+        if (await temp.exists()) await temp.delete(recursive: true);
+      });
+      final service = FileService(
+        MarkdownService(),
+        ImageService(),
+        () => const ThemeProfile(),
+      );
+
+      // These are all rejected before any network access happens.
+      for (final url in [
+        'ftp://example.com/x', // non-web scheme
+        'file:///etc/passwd', // non-web scheme
+        'http://localhost:8080/x.ocideck', // loopback name
+        'http://127.0.0.1/x', // loopback IP
+        'http://192.168.1.5/x', // private IP
+        'http://10.0.0.9/x', // private IP
+        'http://169.254.1.1/x', // link-local IP
+      ]) {
+        expect(
+          await service.importFromUrl(url, temp.path),
+          isNull,
+          reason: 'should refuse $url',
+        );
+      }
+    },
+  );
 }

test/marp_html_service_test.dart

@@ -77,6 +77,25 @@ void main() {}
     expect(html, contains(r'<\/script'));
   });
 
+  test('build() neutralises a mixed-case closing-script breakout', () async {
+    final service = MarpHtmlService(loadAsset: _diskLoader);
+    final html = await service.build('# X\n\nfoo </ScRiPt> bar');
+    // Case tricks must not slip past the guard.
+    expect(html, isNot(contains('</ScRiPt>')));
+    expect(html, contains(r'<\/ScRiPt'));
+  });
+
+  test(
+    'build() bundles DOMPurify and sanitises the rendered markdown',
+    () async {
+      final service = MarpHtmlService(loadAsset: _diskLoader);
+      final html = await service.build('# X');
+      // The sanitiser is inlined and actually used before content hits the DOM.
+      expect(html, contains('DOMPurify'));
+      expect(html, contains('DOMPurify.sanitize('));
+    },
+  );
+
   test('a theme colours the slides with the profile palette', () async {
     final service = MarpHtmlService(
       loadAsset: _diskLoader,
@@ -108,7 +127,10 @@ void main() {}
       codeTextColor: '#33FF33',
       codeFontFamily: 'Courier New',
     );
-    final html = await service.build('```dart\nvoid main() {}\n```', theme: theme);
+    final html = await service.build(
+      '```dart\nvoid main() {}\n```',
+      theme: theme,
+    );
 
     expect(html, contains('.slide pre{background:#000000;color:#33FF33'));
     expect(html, contains('.slide pre code{color:#33FF33'));