Certify key.

In-place editing with a popup if user is allowed in app config file.
User must of course manage at least a private key. User identities of
target key may be selectively chosen. Optionally, certification may be
exportable and non-revocable.

PopupCertifyUserId.h

@@ -0,0 +1,172 @@
+/* 
+ * File:   PopupCertifyUserId.h
+ * Author: SET - nmset@yandex.com
+ * License : GPL v2
+ * Copyright SET - © 2019
+ *
+ * Created on October 30, 2020, 7:50 PM
+ */
+
+#ifndef POPUPCERTIFYUSERID_H
+#define POPUPCERTIFYUSERID_H
+
+#include <Wt/WPopupWidget.h>
+#include <Wt/WContainerWidget.h>
+#include <Wt/WCheckBox.h>
+#include <Wt/WComboBox.h>
+#include <Wt/WPushButton.h>
+#include <Wt/WText.h>
+#include <Wt/WLineEdit.h>
+#include <Wt/WVBoxLayout.h>
+#include <Wt/WHBoxLayout.h>
+#include <vector>
+#include "TransientMessageWidget.h"
+
+using namespace Wt;
+
+/**
+ * A popup with required parameters to certify a key :
+ * <ul>
+ * <li>Signer's private keys</li>
+ * <li>Target key user identities (email)</li>
+ * <li>Signing options : Exportable and non-revocable</li>
+ * <li>Passphrase for selected private key</li>
+ * </ul>
+ * The passphrase is cached by gpg-agent for default 10 mins.
+ * \n The popup hides the passphrase widget until a certify op fails.
+ * \n UserID::Validity:: lists many validity levels. How to selectively apply
+ * an arbitrary level ? Before signing, it's 'Unknown'. After signing, it's
+ * always 'Full'.
+ */
+class PopupCertifyUserId : public WPopupWidget
+{
+public:
+    PopupCertifyUserId(WWidget * anchorWidget, TransientMessageWidget * txtMessage,
+                       const WLength& width = 500);
+    virtual ~PopupCertifyUserId();
+    /**
+     * Must be called on its own.
+     * @param privateKeys
+     * @param fprKeyToSign
+     */
+    void Create(vector<WString>& privateKeys, const WString& fprKeyToSign);
+    /**
+     * 
+     * @return : Fingerprint of selected signing key
+     */
+    WString GetSelectedKey() const;
+    /**
+     * Controls visibility of passphrase widgets.
+     * \n Need not be always visible as the passphrase is cached by gpg-agent.
+     * \n During that caching period, a wrong input passphrase will not be looked
+     * for by GPG engine, and may be confusing.
+     * @param show
+     */
+    void ShowPassphrase(bool show = true);
+    /**
+     * Used to restore the state of the widgets when target key changes.
+     * @return 
+     */
+    bool IsPasswordVisible() const
+    {
+        return m_lePassphrase->isVisible();
+    }
+    /**
+     * Used to forward the passphrase to the loopback passphrase provider.
+     * @return 
+     */
+    const string GetPassphrase()
+    {
+        return m_lePassphrase->text().toUTF8();
+    }
+    /**
+     * Obviously.
+     * @return 
+     */
+    const WString GetKeyToSign()
+    {
+        return m_fprKeyToSign;
+    }
+    /**
+     * We can select what identity (email) to certify. GPG expects it as a
+     * vector of indices.
+     * @return 
+     */
+    vector<uint>& GetUidsToSign()
+    {
+        return m_uidsToSign;
+    }
+    /**
+     * Sum of option values
+     * <ul>
+     * <li>Exportable : 1</li>
+     * <li>Non revocable : 2</li>
+     * </ul>
+     * Trust(4) is not implemented as it always fails.
+     * @return 
+     */
+    int GetCertifyOptions()
+    {
+        return m_certifyOptions;
+    }
+    /**
+     * Caller binds its certify function here.
+     * @return 
+     */
+    WPushButton* GetCertifyButton()
+    {
+        return m_btnApply;
+    }
+private:
+    TransientMessageWidget * m_tmwMessage;
+    WContainerWidget * m_cwMain;
+    WString m_fprKeyToSign;
+
+    WComboBox * m_cmbPrivKeys;
+    WHBoxLayout * m_hblPreferences;
+    WVBoxLayout * m_vblEmail;
+    vector<WCheckBox*> m_lstUids;
+    WCheckBox * m_cbOptionExportable;
+    WCheckBox * m_cbOptionNonRevocable;
+    // WCheckBox * m_cbOptionTrust; // Always fails
+    WText * m_lblPassphrase;
+    WLineEdit * m_lePassphrase;
+    WPushButton * m_btnApply;
+
+    vector<uint> m_uidsToSign;
+    int m_certifyOptions;
+    /**
+     * Available private fingerprints in a combobox. The selected item is the 
+     * signing key.
+     * @param privateKeys
+     */
+    void FillPrivateKeyComboBox(vector<WString>& privateKeys);
+    /**
+     * Show user identities of key to sign. Can be independently selected
+     * using checkboxes.
+     */
+    void PresentEmail();
+    /**
+     * Add the identity index in a vector.
+     * @param cb
+     */
+    void OnEmailChecked(WCheckBox * cb);
+    /**
+     * Removes the identity index in a vector.
+     * @param cb
+     */
+    void OnEmailUnChecked(WCheckBox * cb);
+    /**
+     * Adds the option value in m_certifyOptions.
+     * @param id
+     */
+    void OnCertifyOptionChecked(int id);
+    /**
+     * Subtract the option value from m_certifyOptions.
+     * @param id
+     */
+    void OnCertifyOptionUnChecked(int id);
+};
+
+#endif /* POPUPCERTIFYUSERID_H */
+