secure_clipboard 0.1.2

Secure clipboard manager with auto-clear and background protection

secure_clipboard

A federated Flutter plugin for secure clipboard management. It provides features to protect sensitive data on the clipboard and automatically clear it after a specified duration.

Features

• Sensitive Data Marking (Android 13+): Automatically marks copied content as sensitive, obfuscating it in the system's clipboard preview UI.
• Local-Only Copy (iOS): Prevent sensitive data from being synced to other devices via Universal Clipboard (iCloud).
• Auto-Clear: Automatically clears the clipboard after a configurable Duration.
• Manual Clear: Easily clear the system clipboard programmatically.
• Privacy-First Inspection: Use hasText() to check for content without reading the actual text.
• Clipboard Observer: A stream to listen for clipboard content changes (foreground only on iOS).
• Federated Architecture: Modular design separating platform-specific implementations.

Installation

Add secure_clipboard to your pubspec.yaml:

dependencies:
  secure_clipboard:
    path: path/to/secure_clipboard

Usage

Copying to Clipboard

Copy text with an optional auto-clear timer:

import 'package:secure_clipboard/secure_clipboard.dart';

// Copy normally (marks as sensitive on Android 13+)
await SecureClipboard.copy("my-secret-password");

// Copy with auto-clear after 30 seconds
await SecureClipboard.copy(
  "temporary-token",
  autoClearAfter: Duration(seconds: 30),
);

// Copy with local-only (iOS) to prevent Universal Clipboard sync
await SecureClipboard.copy(
  "super-secret",
  localOnly: true,
);

Checking and Getting Data

// Check if clipboard has text without reading it
bool hasText = await SecureClipboard.hasText();

// Retrieve text from clipboard
String? data = await SecureClipboard.getData();

Clearing the Clipboard

await SecureClipboard.clear();

Observing Clipboard Changes

SecureClipboard.onClipboardChanged.listen((String? content) {
  print("Clipboard changed to: $content");
});

Security Considerations

Android

On Android 13 (API 33) and above, the plugin uses ClipDescription.EXTRA_IS_SENSITIVE. This prevents the copied text from appearing in the system's clipboard confirmation overlay, protecting against "shoulder surfing".

iOS

iOS does not currently provide a way to mask the clipboard preview globally. To mitigate exposure:

• Use the autoClearAfter feature to ensure it doesn't persist.
• Use localOnly: true when copying to prevent the sensitive data from being synced to other devices via Universal Clipboard/iCloud.

General

Always remember that clipboard data is generally accessible to other apps on the system while it resides there. This plugin helps minimize the visual exposure and persistence of sensitive data.

Platform Support

Feature	Android	iOS
Copy/Clear	✅	✅
Get Data	✅	✅
Has Text	✅	✅
Change Listener	✅	✅ (Foreground)
Sensitive Marking	✅ (API 33+)	❌ (N/A)
Local-Only (No Handoff)	❌ (N/A)	✅
Auto-Clear	✅	✅