[pgp] Move all Gajim PGP code into plugin

pgp/modules/util.py

@@ -0,0 +1,49 @@
+# Copyright (C) 2019 Philipp Hörist <philipp AT hoerist.com>
+#
+# This file is part of the PGP Gajim Plugin.
+#
+# PGP Gajim Plugin is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published
+# by the Free Software Foundation; version 3 only.
+#
+# PGP Gajim Plugin 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 General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with PGP Gajim Plugin. If not, see <http://www.gnu.org/licenses/>.
+
+import os
+import subprocess
+
+import nbxmpp
+
+
+def prepare_stanza(stanza, plaintext):
+    delete_nodes(stanza, 'encrypted', nbxmpp.NS_ENCRYPTED)
+    delete_nodes(stanza, 'body')
+    stanza.setBody(plaintext)
+
+
+def delete_nodes(stanza, name, namespace=None):
+    nodes = stanza.getTags(name, namespace=namespace)
+    for node in nodes:
+        stanza.delChild(node)
+
+
+def find_gpg():
+    def _search(binary):
+        if os.name == 'nt':
+            gpg_cmd = binary + ' -h >nul 2>&1'
+        else:
+            gpg_cmd = binary + ' -h >/dev/null 2>&1'
+        if subprocess.call(gpg_cmd, shell=True):
+            return False
+        return True
+
+    if _search('gpg2'):
+        return 'gpg2'
+
+    if _search('gpg'):
+        return 'gpg'