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/*
* qtmaildir - a Qt6 mail client for notmuch-indexed Maildirs
* Copyright (C) 2026 Danilo M. <danix@danix.xyz>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#pragma once
#include <QSet>
#include <QUrl>
#include <QWebEngineUrlRequestInterceptor>
/// Deny-by-default request policy for the message view.
///
/// A message body is untrusted input from a stranger. Everything is blocked
/// unless explicitly permitted: remote loads leak the fact that a message was
/// read (tracking pixels) and file: loads would expose the local filesystem.
class RequestInterceptor : public QWebEngineUrlRequestInterceptor
{
Q_OBJECT
public:
explicit RequestInterceptor(QObject *parent = nullptr);
/// The whole policy, as a pure function so it can be tested directly.
bool shouldAllow(const QUrl &url);
void interceptRequest(QWebEngineUrlRequestInfo &info) override;
/// Content-IDs belonging to the currently displayed message.
void setAllowedCids(const QSet<QString> &cids) { m_allowedCids = cids; }
/// The document's own base URL, i.e. the exact QUrl that MessageView passes
/// as the base URL argument to setHtml(). This is the ONLY qtmaildir: URL
/// that shouldAllow() will pass; every other URL on that scheme, including
/// sub-paths of this one, is denied. Task 11's MessageView MUST call this
/// with the same QUrl it hands to setHtml(), before rendering, or every
/// qtmaildir: load (including the document itself) will be blocked.
/// Defaults to empty, which denies all qtmaildir: URLs (fail closed).
void setDocumentUrl(const QUrl &url) { m_documentUrl = url; }
QUrl documentUrl() const { return m_documentUrl; }
/// Per-message opt-in, triggered by the user clicking "Load remote content".
/// Never persisted, never carried to the next message.
void setAllowRemote(bool allow) { m_allowRemote = allow; }
bool allowRemote() const { return m_allowRemote; }
/// True once any request has been denied, so the UI can offer the button.
bool blockedAnything() const { return m_blockedAnything; }
/// Called before rendering a new message: clears both the remote grant and
/// the blocked flag. Does NOT clear the document URL: the base URL is a
/// property of the view (it is the same qtmaildir: origin the WebEngine
/// page navigates within), not of any one message, so MessageView is
/// expected to call setDocumentUrl() itself whenever that URL changes
/// rather than have it silently reset here.
void resetForNewMessage();
private:
QSet<QString> m_allowedCids;
QUrl m_documentUrl;
bool m_allowRemote = false;
bool m_blockedAnything = false;
};
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