qt: Allow checking if the sign/encrypt archive jobs are supported

* lang/qt/src/encryptarchivejob.cpp, lang/qt/src/encryptarchivejob.h
(isSupported): New.
* lang/qt/src/signarchivejob.cpp, lang/qt/src/signarchivejob.h
(isSupported): New.
* lang/qt/src/signencryptarchivejob.cpp,
lang/qt/src/signencryptarchivejob.h (isSupported): New.

* lang/qt/tests/run-encryptarchivejob.cpp (main),
lang/qt/tests/run-signarchivejob.cpp (main): Check if jobs are
supported.
--

GnuPG-bug-id: 6342

8 files changed, 44 insertions, 0 deletions

diff --git a/lang/qt/src/encryptarchivejob.cpp b/lang/qt/src/encryptarchivejob.cpp
index 5c5533be..a99de13f 100644
--- a/lang/qt/src/encryptarchivejob.cpp
+++ b/lang/qt/src/encryptarchivejob.cpp
@@ -38,6 +38,8 @@
 #include "encryptarchivejob.h"
 #include "encryptarchivejob_p.h"
 
+#include <engineinfo.h>
+
 using namespace QGpgME;
 
 EncryptArchiveJob::EncryptArchiveJob(QObject *parent)
@@ -47,6 +49,13 @@ EncryptArchiveJob::EncryptArchiveJob(QObject *parent)
 
 EncryptArchiveJob::~EncryptArchiveJob() = default;
 
+// static
+bool EncryptArchiveJob::isSupported()
+{
+    static const auto gpgVersion = GpgME::engineInfo(GpgME::GpgEngine).engineVersion();
+    return (gpgVersion >= "2.4.1") || (gpgVersion >= "2.2.42" && gpgVersion < "2.3.0");
+}
+
 void EncryptArchiveJob::setBaseDirectory(const QString &baseDirectory)
 {
     auto d = jobPrivate<EncryptArchiveJobPrivate>(this);
diff --git a/lang/qt/src/encryptarchivejob.h b/lang/qt/src/encryptarchivejob.h
index 1221994f..619d3cef 100644
--- a/lang/qt/src/encryptarchivejob.h
+++ b/lang/qt/src/encryptarchivejob.h
@@ -61,6 +61,8 @@ protected:
 public:
     ~EncryptArchiveJob() override;
 
+    static bool isSupported();
+
     void setBaseDirectory(const QString &baseDirectory);
     QString baseDirectory() const;
 
diff --git a/lang/qt/src/signarchivejob.cpp b/lang/qt/src/signarchivejob.cpp
index fcdf241d..d185ae9f 100644
--- a/lang/qt/src/signarchivejob.cpp
+++ b/lang/qt/src/signarchivejob.cpp
@@ -38,6 +38,8 @@
 #include "signarchivejob.h"
 #include "signarchivejob_p.h"
 
+#include <engineinfo.h>
+
 using namespace QGpgME;
 
 SignArchiveJob::SignArchiveJob(QObject *parent)
@@ -47,6 +49,13 @@ SignArchiveJob::SignArchiveJob(QObject *parent)
 
 SignArchiveJob::~SignArchiveJob() = default;
 
+// static
+bool SignArchiveJob::isSupported()
+{
+    static const auto gpgVersion = GpgME::engineInfo(GpgME::GpgEngine).engineVersion();
+    return (gpgVersion >= "2.4.1") || (gpgVersion >= "2.2.42" && gpgVersion < "2.3.0");
+}
+
 void SignArchiveJob::setBaseDirectory(const QString &baseDirectory)
 {
     auto d = jobPrivate<SignArchiveJobPrivate>(this);
diff --git a/lang/qt/src/signarchivejob.h b/lang/qt/src/signarchivejob.h
index 6b8cd175..f30e3e5e 100644
--- a/lang/qt/src/signarchivejob.h
+++ b/lang/qt/src/signarchivejob.h
@@ -61,6 +61,8 @@ protected:
 public:
     ~SignArchiveJob() override;
 
+    static bool isSupported();
+
     void setBaseDirectory(const QString &baseDirectory);
     QString baseDirectory() const;
 
diff --git a/lang/qt/src/signencryptarchivejob.cpp b/lang/qt/src/signencryptarchivejob.cpp
index 6a9a5abe..b1d5e170 100644
--- a/lang/qt/src/signencryptarchivejob.cpp
+++ b/lang/qt/src/signencryptarchivejob.cpp
@@ -38,6 +38,8 @@
 #include "signencryptarchivejob.h"
 #include "signencryptarchivejob_p.h"
 
+#include <engineinfo.h>
+
 using namespace QGpgME;
 
 SignEncryptArchiveJob::SignEncryptArchiveJob(QObject *parent)
@@ -47,6 +49,13 @@ SignEncryptArchiveJob::SignEncryptArchiveJob(QObject *parent)
 
 SignEncryptArchiveJob::~SignEncryptArchiveJob() = default;
 
+// static
+bool SignEncryptArchiveJob::isSupported()
+{
+    static const auto gpgVersion = GpgME::engineInfo(GpgME::GpgEngine).engineVersion();
+    return (gpgVersion >= "2.4.1") || (gpgVersion >= "2.2.42" && gpgVersion < "2.3.0");
+}
+
 void SignEncryptArchiveJob::setBaseDirectory(const QString &baseDirectory)
 {
     auto d = jobPrivate<SignEncryptArchiveJobPrivate>(this);
diff --git a/lang/qt/src/signencryptarchivejob.h b/lang/qt/src/signencryptarchivejob.h
index 67b2fcbb..2cc28a5e 100644
--- a/lang/qt/src/signencryptarchivejob.h
+++ b/lang/qt/src/signencryptarchivejob.h
@@ -61,6 +61,8 @@ protected:
 public:
     ~SignEncryptArchiveJob() override;
 
+    static bool isSupported();
+
     void setBaseDirectory(const QString &baseDirectory);
     QString baseDirectory() const;
 
diff --git a/lang/qt/tests/run-encryptarchivejob.cpp b/lang/qt/tests/run-encryptarchivejob.cpp
index cdcfa17d..9ce79b6c 100644
--- a/lang/qt/tests/run-encryptarchivejob.cpp
+++ b/lang/qt/tests/run-encryptarchivejob.cpp
@@ -123,6 +123,12 @@ int main(int argc, char **argv)
 
     const auto options = parseCommandLine(app.arguments());
 
+    if ((options.sign && !QGpgME::SignEncryptArchiveJob::isSupported())
+        || (!options.sign && !QGpgME::EncryptArchiveJob::isSupported())) {
+        std::cerr << "Error: Encrypting archives is not supported by your version of gpg." << std::endl;
+        return 1;
+    }
+
     auto output = createOutput(options.archiveName);
     if (!output) {
         return 1;
diff --git a/lang/qt/tests/run-signarchivejob.cpp b/lang/qt/tests/run-signarchivejob.cpp
index c426ba93..affd8e4d 100644
--- a/lang/qt/tests/run-signarchivejob.cpp
+++ b/lang/qt/tests/run-signarchivejob.cpp
@@ -118,6 +118,11 @@ int main(int argc, char **argv)
 
     const auto options = parseCommandLine(app.arguments());
 
+    if (!QGpgME::SignArchiveJob::isSupported()) {
+        std::cerr << "Error: Signing archives is not supported by your version of gpg." << std::endl;
+        return 1;
+    }
+
     auto output = createOutput(options.archiveName);
     if (!output) {
         return 1;