Support password-protected PDF #155 #765

QL will display a UI prompting for a password. Upon entering the correct password, the PDF file will be reopened.

QuickLook.Plugin/QuickLook.Plugin.PDFViewer/PasswordControl.xaml

@@ -0,0 +1,55 @@
+<UserControl x:Class="QuickLook.Plugin.PDFViewer.PasswordControl"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+             xmlns:local="clr-namespace:QuickLook.Plugin.PDFViewer"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+             d:DesignHeight="450"
+             d:DesignWidth="800"
+             mc:Ignorable="d">
+    <Grid>
+        <Border HorizontalAlignment="Center"
+                VerticalAlignment="Center"
+                Background="{DynamicResource CardBackground}"
+                BorderBrush="{DynamicResource CardBorderBrush}"
+                BorderThickness="1"
+                CornerRadius="5">
+            <Grid Margin="24">
+                <StackPanel>
+                    <TextBlock x:Name="titleTextBlock"
+                               FontSize="18"
+                               FontWeight="DemiBold"
+                               Text="Enter Password" />
+                    <TextBlock x:Name="hintTextBlock"
+                               Margin="0,20,0,0"
+                               Text="This file is password protected. Please enter the password to open the file." />
+                    <PasswordBox x:Name="passwordBox"
+                                 MinWidth="400"
+                                 Margin="0,16,0,0" />
+                    <TextBlock x:Name="passwordErrorTextBlock"
+                               MinWidth="400"
+                               Margin="0,16,0,0"
+                               Foreground="Red"
+                               Text="Check your password"
+                               Visibility="Collapsed" />
+                    <Grid MinWidth="400" Margin="0,16,0,0">
+                        <Grid.ColumnDefinitions>
+                            <ColumnDefinition Width="*" />
+                            <ColumnDefinition Width="*" />
+                        </Grid.ColumnDefinitions>
+                        <Button x:Name="openFileButton"
+                                Grid.Column="0"
+                                Margin="0,0,4,0"
+                                HorizontalAlignment="Stretch"
+                                Content="Open File" />
+                        <Button x:Name="cancelButton"
+                                Grid.Column="1"
+                                Margin="4,0,0,0"
+                                HorizontalAlignment="Stretch"
+                                Content="Cancel" />
+                    </Grid>
+                </StackPanel>
+            </Grid>
+        </Border>
+    </Grid>
+</UserControl>

QuickLook.Plugin/QuickLook.Plugin.PDFViewer/PasswordControl.xaml.cs

@@ -0,0 +1,74 @@
+// Copyright © 2024 ema
+//
+// This file is part of QuickLook program.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using QuickLook.Common.Helpers;
+using System;
+using System.Reflection;
+using System.Windows;
+using System.Windows.Controls;
+
+namespace QuickLook.Plugin.PDFViewer;
+
+public partial class PasswordControl : UserControl
+{
+    public event Func<string, bool> PasswordRequested;
+
+    public bool Result { get; private set; } = false;
+    public string Password => passwordBox.Dispatcher.Invoke(() => passwordBox.Password);
+
+    public PasswordControl()
+    {
+        InitializeComponent();
+
+        string domain = Assembly.GetExecutingAssembly().GetName().Name;
+        titleTextBlock.Text = TranslationHelper.Get("PW_Title", domain: domain);
+        hintTextBlock.Text = TranslationHelper.Get("Pw_Hint", domain: domain);
+        passwordErrorTextBlock.Text = TranslationHelper.Get("PW_Error", domain: domain);
+        openFileButton.Content = TranslationHelper.Get("BTN_OpenFile", domain: domain);
+        cancelButton.Content = TranslationHelper.Get("BTN_Cancel", domain: domain);
+        openFileButton.Click += OpenFileButton_Click;
+        cancelButton.Click += CancelButton_Click;
+    }
+
+    private void OpenFileButton_Click(object sender, RoutedEventArgs e)
+    {
+        if (!string.IsNullOrEmpty(Password))
+        {
+            Result = true;
+
+            if (PasswordRequested != null)
+            {
+                bool accepted = PasswordRequested.Invoke(Password);
+
+                if (!accepted)
+                {
+                    passwordErrorTextBlock.Dispatcher.Invoke(() => passwordErrorTextBlock.Visibility = Visibility.Visible);
+                }
+            }
+        }
+    }
+
+    private void CancelButton_Click(object sender, RoutedEventArgs e)
+    {
+        Result = false;
+
+        if (Window.GetWindow(this) is Window window)
+        {
+            window.Close();
+        }
+    }
+}

QuickLook.Plugin/QuickLook.Plugin.PDFViewer/PdfDocumentWrapper.cs

@@ -23,12 +23,12 @@ namespace QuickLook.Plugin.PDFViewer;
 
 public class PdfDocumentWrapper : IDisposable
 {
-    public PdfDocumentWrapper(Stream stream)
+    public PdfDocumentWrapper(Stream stream, string password = null)
     {
         PdfStream = new MemoryStream((int)stream.Length);
         stream.CopyTo(PdfStream);
 
-        PdfDocument = PdfDocument.Load(PdfStream);
+        PdfDocument = PdfDocument.Load(PdfStream, password);
     }
 
     public PdfDocument PdfDocument { get; private set; }

QuickLook.Plugin/QuickLook.Plugin.PDFViewer/PdfViewerControl.xaml.cs

@@ -213,13 +213,13 @@ private void UpdatePageViewWhenSelectionChanged(object sender, SelectionChangedE
         }
     }
 
-    public static Size GetDesiredControlSizeByFirstPage(string path)
+    public static Size GetDesiredControlSizeByFirstPage(string path, string password = null)
     {
         Size size;
 
         using (var s = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
         {
-            using (var tempHandle = PdfDocument.Load(s))
+            using (var tempHandle = PdfDocument.Load(s, password))
             {
                 size = new Size(0, 0);
                 tempHandle.PageSizes.Take(5).ForEach(p =>
@@ -236,10 +236,10 @@ public static Size GetDesiredControlSizeByFirstPage(string path)
         return new Size(size.Width * 3, size.Height * 3);
     }
 
-    public void LoadPdf(string path)
+    public void LoadPdf(string path, string password = null)
     {
         var stream = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
-        PdfDocumentWrapper = new PdfDocumentWrapper(stream);
+        PdfDocumentWrapper = new PdfDocumentWrapper(stream, password);
         _pdfLoaded = true;
 
         if (PdfDocumentWrapper.PdfDocument.PageCount < 2)

QuickLook.Plugin/QuickLook.Plugin.PDFViewer/Plugin.cs

@@ -15,11 +15,13 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+using PdfiumViewer;
 using QuickLook.Common.Plugin;
 using System;
 using System.IO;
 using System.Runtime.ExceptionServices;
 using System.Text;
+using System.Windows;
 using System.Windows.Threading;
 
 namespace QuickLook.Plugin.PDFViewer;
@@ -29,6 +31,7 @@ public class Plugin : IViewer
     private ContextObject _context;
     private string _path;
     private PdfViewerControl _pdfControl;
+    private PasswordControl _passwordControl;
 
     public int Priority => 0;
 
@@ -55,9 +58,16 @@ public void Prepare(string path, ContextObject context)
         _context = context;
         _path = path;
 
-        var desiredSize = PdfViewerControl.GetDesiredControlSizeByFirstPage(path);
-
-        context.SetPreferredSizeFit(desiredSize, 0.9);
+        try
+        {
+            var desiredSize = PdfViewerControl.GetDesiredControlSizeByFirstPage(path);
+            context.SetPreferredSizeFit(desiredSize, 0.9);
+        }
+        catch (PdfException ex) when (ex.Message == "Password required or incorrect password")
+        {
+            // Fallback to a size to request the password
+            context.PreferredSize = new Size { Width = 800, Height = 600 };
+        }
     }
 
     public void View(string path, ContextObject context)
@@ -67,7 +77,7 @@ public void View(string path, ContextObject context)
 
         Exception exception = null;
 
-        _pdfControl.Dispatcher.BeginInvoke(new Action(() =>
+        _ = _pdfControl.Dispatcher.BeginInvoke(() =>
         {
             try
             {
@@ -78,11 +88,46 @@ public void View(string path, ContextObject context)
                 _pdfControl.CurrentPageChanged += UpdateWindowCaption;
                 context.IsBusy = false;
             }
-            catch (Exception e)
+            catch (PdfException ex) when (ex.Message == "Password required or incorrect password")
+            {
+                // Fallback to request a password
+                _passwordControl = new PasswordControl();
+                _passwordControl.PasswordRequested += (string password) =>
+                {
+                    try
+                    {
+                        var desiredSize = PdfViewerControl.GetDesiredControlSizeByFirstPage(path, password);
+                        context.SetPreferredSizeFit(desiredSize, 0.9); // Actually it is no longer effective here
+
+                        context.ViewerContent = _pdfControl;
+
+                        context.IsBusy = true;
+                        _pdfControl.LoadPdf(path, password);
+
+                        context.Title = $"1 / {_pdfControl.TotalPages}: {Path.GetFileName(path)}";
+
+                        _pdfControl.CurrentPageChanged += UpdateWindowCaption;
+                        context.IsBusy = false;
+                    }
+                    catch (PdfException ex) when (ex.Message == "Password required or incorrect password")
+                    {
+                        // This password is not accepted
+                        return false;
+                    }
+
+                    // This password is accepted
+                    return true;
+                };
+
+                context.ViewerContent = _passwordControl;
+                context.Title = $"[PASSWORD PROTECTED] {Path.GetFileName(path)}";
+                context.IsBusy = false;
+            }
+            catch (Exception ex)
             {
-                exception = e;
+                exception = ex;
             }
-        }), DispatcherPriority.Loaded).Wait();
+        }, DispatcherPriority.Loaded).Wait();
 
         if (exception != null)
             ExceptionDispatchInfo.Capture(exception).Throw();

QuickLook.Plugin/QuickLook.Plugin.PDFViewer/QuickLook.Plugin.PdfViewer.csproj

@@ -86,6 +86,12 @@
         <Resource Include="Resources\loading.png" />
     </ItemGroup>
 
+    <ItemGroup>
+        <None Include="Translations.config">
+            <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+        </None>
+    </ItemGroup>
+
     <ItemGroup>
         <Compile Include="..\..\GitVersion.cs">
             <Link>Properties\GitVersion.cs</Link>

QuickLook.Plugin/QuickLook.Plugin.PDFViewer/Translations.config

@@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<Translations>
+  <en>
+    <PW_Title>Enter Password</PW_Title>
+    <Pw_Hint>This file is password protected. Please enter the password to open the file.</Pw_Hint>
+    <PW_Error>Check your password</PW_Error>
+    <BTN_OpenFile>Open File</BTN_OpenFile>
+    <BTN_Cancel>BTN_Cancel</BTN_Cancel>
+  </en>
+  <ja-JP>
+    <PW_Title>パスワード入力</PW_Title>
+    <Pw_Hint>このファイルではパスワードで保護されています。ファイルを開くにはパスワードを入力してください。</Pw_Hint>
+    <PW_Error>パスワードを確認してください</PW_Error>
+    <BTN_OpenFile>ファイルを開く</BTN_OpenFile>
+    <BTN_Cancel>キャンセル</BTN_Cancel>
+  </ja-JP>
+  <zh-CN>
+    <PW_Title>输入密码</PW_Title>
+    <Pw_Hint>此文件受密码保护。请输入密码以打开文件。</Pw_Hint>
+    <PW_Error>检查您的密码</PW_Error>
+    <BTN_OpenFile>打开文件</BTN_OpenFile>
+    <BTN_Cancel>取消</BTN_Cancel>
+  </zh-CN>
+  <zh-TW>
+    <PW_Title>輸入密碼</PW_Title>
+    <Pw_Hint>此檔案受密碼保護。請輸入密碼以開啟檔案。</Pw_Hint>
+    <PW_Error>檢查您的密碼</PW_Error>
+    <BTN_OpenFile>開啟檔案</BTN_OpenFile>
+    <BTN_Cancel>取消</BTN_Cancel>
+  </zh-TW>
+</Translations>