Allow revoking key certifications.

Certified user identities in keys can be revoked using the same popup
for certification.

Requires GnuPG 2.2.24 (not available in distro's repository, not fully
tested to date).

PopupCertifyUserId.h

@@ -19,28 +19,32 @@
 #include <Wt/WLineEdit.h>
 #include <Wt/WVBoxLayout.h>
 #include <Wt/WHBoxLayout.h>
+#include <Wt/WGroupBox.h>
+#include <Wt/WButtonGroup.h>
 #include <vector>
+#include <gpgme++/key.h>
 #include "TransientMessageWidget.h"
 
 using namespace Wt;
 
 /**
- * A popup with required parameters to certify a key :
+ * A popup with required parameters to certify or revoke a key uid :
  * <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'.
+ * \n For revocation, GnuPG >= 2.2.24 is required.
  */
 class PopupCertifyUserId : public WPopupWidget
 {
 public:
+
+    enum What
+    {
+        RevokeUidCertification = 0, CertifyUid
+    };
     PopupCertifyUserId(WWidget * anchorWidget, TransientMessageWidget * txtMessage,
                        const WLength& width = 500);
     virtual ~PopupCertifyUserId();
@@ -102,6 +106,27 @@ public:
         return m_uidsToSign;
     }
 
+    /**
+     * Get the certifications to revoke.
+     * \n GPGME >= 1.15.0 is required. It expects
+     * it as a vector of GpgME::UserID, instead of a vector of indices used in
+     * GetUidsToSign().
+     * @return 
+     */
+    vector<GpgME::UserID>& GetUidsToRevokeCertification()
+    {
+        return m_uidsToRevokeCertification;
+    }
+
+    /**
+     * Certify selected user identities or revoke certifications.
+     * @return 
+     */
+    const What WhatToDo() const
+    {
+        return (What) m_bgWhat->checkedId();
+    }
+
     /**
      * Sum of option values
      * <ul>
@@ -141,7 +166,10 @@ private:
     WPushButton * m_btnApply;
 
     vector<uint> m_uidsToSign;
+    vector<GpgME::UserID> m_uidsToRevokeCertification;
     int m_certifyOptions;
+    WGroupBox * m_gbOptions;
+    shared_ptr<WButtonGroup> m_bgWhat;
     /**
      * Available private fingerprints in a combobox. The selected item is the 
      * signing key.
@@ -154,15 +182,17 @@ private:
      */
     void PresentEmail();
     /**
-     * Add the identity index in a vector.
+     * Add the identity index in a vector for certification.
+     * \n Add the ::UserID in a vector for signature revocation.
      * @param cb
      */
-    void OnEmailChecked(WCheckBox * cb);
+    void OnEmailChecked(WCheckBox * cb, GpgME::UserID& uid);
     /**
-     * Removes the identity index in a vector.
+     * Removes the identity index from a vector for certification.
+     * \n Removes the ::UserID from a vector for signature revocation.
      * @param cb
      */
-    void OnEmailUnChecked(WCheckBox * cb);
+    void OnEmailUnChecked(WCheckBox * cb, GpgME::UserID& uid);
     /**
      * Adds the option value in m_certifyOptions.
      * @param id
@@ -173,6 +203,11 @@ private:
      * @param id
      */
     void OnCertifyOptionUnChecked(int id);
+    /**
+     * Show certification options if certifying, else hide them.
+     * @param btn
+     */
+    void OnButtonGroupWhat(WRadioButton * btn);
 };
 
 #endif /* POPUPCERTIFYUSERID_H */