ipalib: split off client-side plugin code into ipaclient

Provide client-side overrides for command plugins which implement any of
the client-side `interactive_prompt_callback`, `forward` or
`output_for_cli` methods and move the methods from the original plugins to
the overrides.

https://fedorahosted.org/freeipa/ticket/4739

Reviewed-By: David Kupka <dkupka@redhat.com>

ipaclient/plugins/user.py

@@ -0,0 +1,82 @@
+# Authors:
+#   Jason Gerard DeRose <jderose@redhat.com>
+#   Pavel Zuna <pzuna@redhat.com>
+#
+# Copyright (C) 2008  Red Hat
+# see file 'COPYING' for use and warranty information
+#
+# This program 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, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+
+from ipaclient.frontend import MethodOverride
+from ipalib import errors
+from ipalib import Flag
+from ipalib import util
+from ipalib.plugable import Registry
+from ipalib import _
+from ipalib import x509
+
+register = Registry()
+
+
+@register(override=True)
+class user_del(MethodOverride):
+    def get_options(self):
+        for option in super(user_del, self).get_options():
+            yield option
+        yield Flag(
+            'preserve?',
+            include='cli',
+            doc=_('Delete a user, keeping the entry available for future use'),
+        )
+        yield Flag(
+            'no_preserve?',
+            include='cli',
+            doc=_('Delete a user'),
+        )
+
+    def forward(self, *keys, **options):
+        if self.api.env.context == 'cli':
+            no_preserve = options.pop('no_preserve', False)
+            preserve = options.pop('preserve', False)
+            if no_preserve and preserve:
+                raise errors.MutuallyExclusiveError(
+                    reason=_("preserve and no-preserve cannot be both set"))
+            elif no_preserve:
+                options['preserve'] = False
+            elif preserve:
+                options['preserve'] = True
+
+        return super(user_del, self).forward(*keys, **options)
+
+
+@register(override=True)
+class user_show(MethodOverride):
+    def forward(self, *keys, **options):
+        if 'out' in options:
+            util.check_writable_file(options['out'])
+            result = super(user_show, self).forward(*keys, **options)
+            if 'usercertificate' in result['result']:
+                x509.write_certificate_list(
+                    result['result']['usercertificate'],
+                    options['out']
+                )
+                result['summary'] = (
+                    _('Certificate(s) stored in file \'%(file)s\'')
+                    % dict(file=options['out'])
+                )
+                return result
+            else:
+                raise errors.NoCertificateError(entry=keys[-1])
+        else:
+            return super(user_show, self).forward(*keys, **options)