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 /* -*- mode: c++; c-basic-offset:4 -*-
     crypto/sender.cpp
 
     This file is part of Kleopatra, the KDE keymanager
     SPDX-FileCopyrightText: 2009 Klarälvdalens Datakonsult AB
 
     SPDX-License-Identifier: GPL-2.0-or-later
 */
 
 #include <config-kleopatra.h>
 
 #include "sender.h"
 
 #include <Libkleo/KeyCache>
 #include <Libkleo/Predicates>
 #include <Libkleo/Stl_Util>
 
 #include <utils/cached.h>
 #include <utils/kleo_assert.h>
 
 #include <KMime/Types>
 
 #include <gpgme++/key.h>
 
 #include <algorithm>
 
 using namespace Kleo;
 using namespace Kleo::Crypto;
 using namespace KMime::Types;
 using namespace GpgME;
 
 namespace KMime
 {
 namespace Types
 {
 static bool operator==(const AddrSpec &lhs, const AddrSpec &rhs)
 {
     return lhs.localPart == rhs.localPart && lhs.domain == rhs.domain;
 }
 
 static bool operator==(const Mailbox &lhs, const Mailbox &rhs)
 {
     return lhs.name() == rhs.name() && lhs.addrSpec() == rhs.addrSpec();
 }
 
 static bool determine_ambiguous(const Mailbox &mb, const std::vector<Key> &keys)
 {
     Q_UNUSED(mb)
     // ### really do check when we don't only show matching keys
     return keys.size() != 1;
 }
 } // namespace Types
 } // namespace KMime
 
 class Sender::Private
 {
     friend class ::Kleo::Crypto::Sender;
 
 public:
     explicit Private(const Mailbox &mb)
         : mailbox(mb)
     {
         // ### also fill up to a certain number of keys with those
         // ### that don't match, for the case where there's a low
         // ### total number of keys
         const QString email = mb.addrSpec().asString();
         const std::vector<Key> signers = KeyCache::instance()->findSigningKeysByMailbox(email);
         const std::vector<Key> encrypt = KeyCache::instance()->findEncryptionKeysByMailbox(email);
         kdtools::separate_if(signers.cbegin(), signers.cend(), std::back_inserter(pgpSigners), std::back_inserter(cmsSigners), [](const Key &key) {
             return key.protocol() == OpenPGP;
         });
         kdtools::separate_if(encrypt.cbegin(),
                              encrypt.cend(),
                              std::back_inserter(pgpEncryptToSelfKeys),
                              std::back_inserter(cmsEncryptToSelfKeys),
                              [](const Key &key) {
                                  return key.protocol() == OpenPGP;
                              });
     }
 
 private:
     const Mailbox mailbox;
     std::vector<Key> pgpSigners, cmsSigners, pgpEncryptToSelfKeys, cmsEncryptToSelfKeys;
     cached<bool> signingAmbiguous[2], encryptionAmbiguous[2];
     Key signingKey[2], cmsEncryptionKey;
     UserID pgpEncryptionUid;
 };
 
 Sender::Sender(const Mailbox &mb)
     : d(new Private(mb))
 {
 }
 
 void Sender::detach()
 {
     if (d && !d.unique()) {
         d.reset(new Private(*d));
     }
 }
 
 bool Sender::deepEquals(const Sender &other) const
 {
     static const _detail::ByFingerprint<std::equal_to> compare = {};
     return mailbox() == other.mailbox() //
         && compare(d->signingKey[CMS], other.d->signingKey[CMS]) //
         && compare(d->signingKey[OpenPGP], other.d->signingKey[OpenPGP]) //
         && compare(d->cmsEncryptionKey, other.d->cmsEncryptionKey) //
         && compare(d->pgpEncryptionUid.parent(), other.d->pgpEncryptionUid.parent()) && strcmp(d->pgpEncryptionUid.id(), other.d->pgpEncryptionUid.id()) == 0
         && std::equal(d->pgpSigners.cbegin(), d->pgpSigners.cend(), other.d->pgpSigners.cbegin(), compare)
         && std::equal(d->cmsSigners.cbegin(), d->cmsSigners.cend(), other.d->cmsSigners.cbegin(), compare)
         && std::equal(d->pgpEncryptToSelfKeys.cbegin(), d->pgpEncryptToSelfKeys.cend(), other.d->pgpEncryptToSelfKeys.cbegin(), compare)
         && std::equal(d->cmsEncryptToSelfKeys.cbegin(), d->cmsEncryptToSelfKeys.cend(), other.d->cmsEncryptToSelfKeys.cbegin(), compare);
 }
 
 bool Sender::isSigningAmbiguous(GpgME::Protocol proto) const
 {
     if (d->signingAmbiguous[proto].dirty()) {
         d->signingAmbiguous[proto] = determine_ambiguous(d->mailbox, signingCertificateCandidates(proto));
     }
     return d->signingAmbiguous[proto];
 }
 
 bool Sender::isEncryptionAmbiguous(GpgME::Protocol proto) const
 {
     if (d->encryptionAmbiguous[proto].dirty()) {
         d->encryptionAmbiguous[proto] = determine_ambiguous(d->mailbox, encryptToSelfCertificateCandidates(proto));
     }
     return d->encryptionAmbiguous[proto];
 }
 
 const Mailbox &Sender::mailbox() const
 {
     return d->mailbox;
 }
 
 const std::vector<Key> &Sender::signingCertificateCandidates(GpgME::Protocol proto) const
 {
     if (proto == OpenPGP) {
         return d->pgpSigners;
     }
     if (proto == CMS) {
         return d->cmsSigners;
     }
     kleo_assert_fail(proto == OpenPGP || proto == CMS);
 #if 0
     return
         proto == OpenPGP ? d->pgpSigners :
         proto == CMS     ? d->cmsSigners :
         // even though gcc warns about this line, it's completely ok, promise:
         kleo_assert_fail(proto == OpenPGP || proto == CMS);
 #endif
 }
 
 const std::vector<Key> &Sender::encryptToSelfCertificateCandidates(GpgME::Protocol proto) const
 {
     if (proto == OpenPGP) {
         return d->pgpEncryptToSelfKeys;
     }
     if (proto == CMS) {
         return d->cmsEncryptToSelfKeys;
     }
     kleo_assert_fail(proto == OpenPGP || proto == CMS);
 #if 0
     return
         proto == OpenPGP ? d->pgpEncryptToSelfKeys :
         proto == CMS     ? d->cmsEncryptToSelfKeys :
         // even though gcc warns about this line, it's completely ok, promise:
         kleo_assert_fail(proto == OpenPGP || proto == CMS);
 #endif
 }
 
 void Sender::setResolvedSigningKey(const Key &key)
 {
     if (key.isNull()) {
         return;
     }
     const Protocol proto = key.protocol();
     kleo_assert(proto == OpenPGP || proto == CMS);
     detach();
     d->signingKey[proto] = key;
     d->signingAmbiguous[proto] = false;
 }
 
 Key Sender::resolvedSigningKey(GpgME::Protocol proto) const
 {
     kleo_assert(proto == OpenPGP || proto == CMS);
     return d->signingKey[proto];
 }
 
 void Sender::setResolvedEncryptionKey(const Key &key)
 {
     if (key.isNull()) {
         return;
     }
     const Protocol proto = key.protocol();
     kleo_assert(proto == OpenPGP || proto == CMS);
     detach();
     if (proto == OpenPGP) {
         d->pgpEncryptionUid = key.userID(0);
     } else {
         d->cmsEncryptionKey = key;
     }
     d->encryptionAmbiguous[proto] = false;
 }
 
 Key Sender::resolvedEncryptionKey(GpgME::Protocol proto) const
 {
     kleo_assert(proto == OpenPGP || proto == CMS);
     if (proto == OpenPGP) {
         return d->pgpEncryptionUid.parent();
     } else {
         return d->cmsEncryptionKey;
     }
 }
 
 void Sender::setResolvedOpenPGPEncryptionUserID(const UserID &uid)
 {
     if (uid.isNull()) {
         return;
     }
     detach();
     d->pgpEncryptionUid = uid;
 }
 
 UserID Sender::resolvedOpenPGPEncryptionUserID() const
 {
     return d->pgpEncryptionUid;
 }