Papyrus

A policy-driven federated native WebView for Flutter. Papyrus embeds the platform system WebView on each supported target and exposes a uniform, conservative-by-default API for loading, navigation, resource control, security, storage, and interaction policy.

Papyrus is designed for controlled HTML rendering — document viewers, email HTML renderers, sandboxed content panels — not as a general-purpose browser shell.

Features

PapyrusView widget with a PapyrusController for programmatic control
Policy-first design: security, navigation, storage, and interaction policies
Runtime capability detection via PapyrusController.getCapabilities()
Resource interception with custom response injection
Ephemeral / partitioned storage profiles
Print, snapshot, auto-height, clearCache, clearStorage
Structured error reporting (PapyrusError, PapyrusNavigationBlockedError, PapyrusWebViewUnavailableError)

Platform support

Platform	Engine	Embedded view	Resource interception	Ephemeral storage
Android	Android System WebView	✓	✓	✓
iOS	WKWebView	✓	✓	✓
macOS	WKWebView	✓ (overlay)	✓	✓
Windows	WebView2	✓ (overlay)	✓	Partial
Linux	WebKitGTK	✓ (overlay)	Feasible	✓

Getting started

dependencies:
  papyrus: ^0.1.0

Usage

import 'package:papyrus/papyrus.dart';

PapyrusView(
  controller: PapyrusController(
    initialRequest: PapyrusLoadRequest.url('https://example.com'),
    securityPolicy: PapyrusSecurityPolicy(
      allowInsecureContent: false,
      allowFileAccess: false,
    ),
  ),
)

Platform-specific setup

macOS

Add com.apple.security.network.client to both DebugProfile.entitlements and Release.entitlements in your macOS runner.

Windows

Microsoft Edge WebView2 Runtime must be installed on the end-user machine. See the papyrus_windows README for packaging options.

Linux

Install WebKitGTK development packages (libwebkit2gtk-4.1-0 on Ubuntu 22.04+). See the papyrus_linux README for distribution-specific details.