cpp,tests: Add test runner for doing a WKD lookup without import

* lang/cpp/tests/Makefile.am (run_wkdlookup_SOURCES, programs_unix):
New.
(noinst_PROGRAMS): Add $(programs_unix).
* lang/cpp/tests/run-wkdlookup.cpp: New.
--

This test runner is a prototype for doing a WKD lookup without implicit
import of the found key(s).

Building this test runner is disabled on Windows because it may not
work there. Feel free to enable it on Windows if the test runner works
there.

GnuPG-bug-id: 5728

lang/cpp/tests/Makefile.am

@@ -32,5 +32,14 @@ AM_CPPFLAGS = -I$(top_srcdir)/lang/cpp/src -I$(top_builddir)/src \
 run_getkey_SOURCES = run-getkey.cpp
 run_keylist_SOURCES = run-keylist.cpp
 run_verify_SOURCES = run-verify.cpp
+if !HAVE_W32_SYSTEM
+run_wkdlookup_SOURCES = run-wkdlookup.cpp
+endif
 
-noinst_PROGRAMS = run-getkey run-keylist run-verify
+if HAVE_W32_SYSTEM
+programs_unix =
+else
+programs_unix = run-wkdlookup
+endif
+
+noinst_PROGRAMS = run-getkey run-keylist run-verify $(programs_unix)

lang/cpp/tests/run-wkdlookup.cpp

@@ -0,0 +1,156 @@
+/*
+    run-wkdlookup.cpp
+
+    This file is part of GpgMEpp's test suite.
+    Copyright (c) 2021 g10 Code GmbH
+    Software engineering by Ingo Klöcker <dev@ingo-kloecker.de>
+
+    GPGME++ is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Library General Public
+    License as published by the Free Software Foundation; either
+    version 2 of the License, or (at your option) any later version.
+
+    GPGME++ 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 Library General Public License for more details.
+
+    You should have received a copy of the GNU Library General Public License
+    along with GPGME++; see the file COPYING.LIB.  If not, write to the
+    Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+    Boston, MA 02110-1301, USA.
+*/
+
+#ifdef HAVE_CONFIG_H
+ #include "config.h"
+#endif
+
+#include "context.h"
+#include "data.h"
+#include "defaultassuantransaction.h"
+#include "key.h"
+
+#include <memory>
+#include <sstream>
+#include <iostream>
+#include <thread>
+
+using namespace GpgME;
+
+static int
+show_usage (int ex)
+{
+  fputs ("usage: run-wkdlookup <email address>\n\n"
+         , stderr);
+  exit (ex);
+}
+
+int
+main (int argc, char **argv)
+{
+    int last_argc = -1;
+
+    if (argc) {
+        argc--; argv++;
+    }
+
+    while (argc && last_argc != argc ) {
+        last_argc = argc;
+        if (!strcmp (*argv, "--")) {
+            argc--; argv++;
+            break;
+        } else if (!strcmp (*argv, "--help")) {
+            show_usage (0);
+        } else if (!strncmp (*argv, "--", 2)) {
+            show_usage (1);
+        }
+    }
+
+    if (argc != 1) {
+        show_usage (1);
+    }
+
+    const std::string email{*argv};
+
+    GpgME::initializeLibrary();
+    Error err;
+    auto ctx = std::unique_ptr<Context>{Context::createForEngine(AssuanEngine, &err)};
+    if (!ctx) {
+        std::cerr << "Failed to get context (Error: " << err.asString() << ")\n";
+        return -1;
+    }
+
+    const std::string dirmngrSocket = GpgME::dirInfo("dirmngr-socket");
+    if ((err = ctx->setEngineFileName(dirmngrSocket.c_str()))) {
+        std::cerr << "Failed to set engine file name (Error: " << err.asString() << ")\n";
+        return -1;
+    }
+    if ((err = ctx->setEngineHomeDirectory(""))) {
+        std::cerr << "Failed to set engine home directory (Error: " << err.asString() << ")\n";
+        return -1;
+    }
+
+    // try do connect to dirmngr
+    err = ctx->assuanTransact("GETINFO version");
+    if (err && err.code() != GPG_ERR_ASS_CONNECT_FAILED) {
+        std::cerr << "Failed to start assuan transaction (Error: " << err.asString() << ")\n";
+        return -1;
+    }
+    if (err.code() == GPG_ERR_ASS_CONNECT_FAILED) {
+        std::cerr << "Starting dirmngr ...\n";
+        auto spawnCtx = std::unique_ptr<Context>{Context::createForEngine(SpawnEngine, &err)};
+        if (!spawnCtx) {
+            std::cerr << "Failed to get context for spawn engine (Error: " << err.asString() << ")\n";
+            return -1;
+        }
+
+        const auto dirmngrProgram = GpgME::dirInfo("dirmngr-name");
+        const auto homedir = GpgME::dirInfo("homedir");
+        const char *argv[] = {
+            dirmngrProgram,
+            "--homedir",
+            homedir,
+            "--daemon",
+            NULL
+        };
+        auto ignoreIO = Data{Data::null};
+        err = spawnCtx->spawnAsync(dirmngrProgram, argv,
+                                   ignoreIO, ignoreIO, ignoreIO,
+                                   Context::SpawnDetached);
+        if (err) {
+            std::cerr << "Failed to start dirmngr (Error: " << err.asString() << ")\n";
+            return -1;
+        }
+
+        // wait for socket to become available
+        int cnt = 0;
+        do {
+            ++cnt;
+            std::cerr << "Waiting for dirmngr to start ...\n";
+            std::this_thread::sleep_for(std::chrono::milliseconds{250 * cnt});
+            err = ctx->assuanTransact("GETINFO version");
+        } while (err.code() == GPG_ERR_ASS_CONNECT_FAILED && cnt < 5);
+    }
+
+    const auto cmd = std::string{"WKD_GET "} + email;
+    err = ctx->assuanTransact(cmd.c_str());
+    if (err && err.code() != GPG_ERR_NO_NAME && err.code() != GPG_ERR_NO_DATA) {
+        std::cerr << "Error: WKD_GET returned " << err.asString() << "\n";
+        return -1;
+    }
+
+    const auto transaction = std::unique_ptr<DefaultAssuanTransaction>(dynamic_cast<DefaultAssuanTransaction*>(ctx->takeLastAssuanTransaction().release()));
+    const auto source = transaction->firstStatusLine("SOURCE");
+    const auto rawData = transaction->data();
+    if (rawData.size() == 0) {
+        std::cout << "No key found for " << email << "\n";
+    } else {
+        const auto data = GpgME::Data{rawData.c_str(), rawData.size()};
+        const auto keys = data.toKeys(GpgME::OpenPGP);
+        for (const auto &key : keys) {
+            std::cout << "Found key for " << email << " at " << source << ":\n" << key << "\n";
+        }
+    }
+
+    return 0;
+}