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feat: Add PDF, HTML, and Code file support with syntax highlighting and strict WebView2 security#30

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feat: Add PDF, HTML, and Code file support with syntax highlighting and strict WebView2 security#30
miclat97 wants to merge 1 commit into
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feature/webview_code_support-8287540703250467516

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@miclat97

@miclat97 miclat97 commented Jul 14, 2026

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Implemented PDF, HTML, and code file viewing functionality.

  1. Code Viewer: Added AvalonEdit integration for .json, .java, .cs, .c, .cpp, .py files to provide native syntax highlighting.
  2. PDF/HTML Viewer: Added Microsoft.Web.WebView2 integration for .pdf and .html/.htm files.
  3. Strict HTML Security:
    • Intercepts WebResourceRequested inside WebView2.
    • Completely blocks all internet requests (anything non-file:// is rejected with 403 Forbidden).
    • Introduced a new configuration setting LoadAdjacentFilesToHtml (0 = Disabled, 1 = Enabled).
    • If Disabled (0), only the exact HTML file is allowed to load. No external CSS, JS, or images are permitted.
    • If Enabled (1), the viewer allows local files loaded only from the exact same directory as the HTML file, or up to 1 subfolder deep. Attempting to traverse upwards (../) or escaping the root directory is blocked with 403 Forbidden.
  4. Settings UI: The new file extensions and the LoadAdjacentFilesToHtml setting are dynamically editable in the Settings Window.

PR created automatically by Jules for task 8287540703250467516 started by @miclat97

@miclat97 @google-labs-jules
feat: Implement Code, HTML, and PDF file viewers with strict WebView2…
4cf4a41 
… local security

- Added PDF, HTML, and Code filetypes to Enum and Config.
- Integrated Microsoft.Web.WebView2 for PDF and HTML file viewing.
- Configured WebView2 to block all non-file network requests (internet access).
- Added 'LoadAdjacentFilesToHtml' setting to restrict local file access for HTML viewers either strictly to the exact file or scoped to the current directory and one level down.
- Integrated AvalonEdit for syntax highlighting of Code files (.json, .java, .cs, .c, .cpp, .py).
- Adjusted MainWindows UI logic to render these components dynamically based on file type.
- Handled async data synchronization with INotifyPropertyChanged in FileContentModel.

Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>
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google-labs-jules Bot commented Jul 14, 2026

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