1 files changed, 145 insertions, 0 deletions
diff --git a/base/common/python/pki/cli.py b/base/common/python/pki/cli.py
new file mode 100644
index 000000000..d44875fcb
--- /dev/null
+++ b/base/common/python/pki/cli.py
@@ -0,0 +1,145 @@
+#!/usr/bin/python
+# Authors:
+#     Endi S. Dewata <edewata@redhat.com>
+#
+# 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; version 2 of the License.
+#
+# 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, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+#
+# Copyright (C) 2015 Red Hat, Inc.
+# All rights reserved.
+#
+
+import sys
+import collections
+
+
+class CLI(object):
+
+    def __init__(self, name, description):
+
+        self.name = name
+        self.description = description
+        self.parent = None
+
+        self.verbose = False
+        self.modules = collections.OrderedDict()
+
+    def set_verbose(self, verbose):
+        self.verbose = verbose
+        if self.parent:
+            self.parent.set_verbose(verbose)
+
+    def get_full_name(self):
+        if self.parent:
+            return self.parent.get_full_module_name(self.name)
+        return self.name
+
+    def get_full_module_name(self, module_name):
+        return self.get_full_name() + '-' + module_name
+
+    def add_module(self, module):
+        self.modules[module.name] = module
+        module.parent = self
+
+    def get_module(self, name):
+        return self.modules.get(name)
+
+    def print_message(self, message):
+        print '-' * len(message)
+        print message
+        print '-' * len(message)
+
+    def print_help(self):
+
+        print 'Commands:'
+
+        for module in self.modules.itervalues():
+            full_name = module.get_full_name()
+            print ' {:30}{:30}'.format(full_name, module.description)
+
+    def init(self):
+        pass
+
+    def execute(self, args):
+
+        if len(args) == 0:
+            self.print_help()
+            sys.exit()
+
+        # A command consists of parts joined by dashes: <part 1>-<part 2>-...-<part N>.
+        # For example: cert-request-find
+        command = args[0]
+
+        # The command will be split into module name and sub command, for example:
+        #  - module name: cert
+        #  - sub command: request-find
+        module_name = None
+        sub_command = None
+
+        # Search the module by incrementally adding parts into module name.
+        # Repeat until it finds the module or until there is no more parts to add.
+        module = None
+        position = 0
+
+        while True:
+
+            # Find the next dash.
+            i = command.find('-', position)
+            if i >= 0:
+                # Dash found. Split command into module name and sub command.
+                module_name = command[0:i]
+                sub_command = command[i+1:]
+            else:
+                # Dash not found. Use the whole command.
+                module_name = command
+                sub_command = None
+
+            if self.verbose:
+                print 'Module: %s' % module_name
+
+            m = self.get_module(module_name)
+            if m:
+                # Module found. Check sub command.
+                if not sub_command:
+                    # No sub command. Use this module.
+                    module = m
+                    break
+
+                # There is a sub command. It must be processed by module's children.
+                if len(m.modules) > 0:
+                    # Module has children. Use this module.
+                    module = m
+                    break
+
+                # Module doesn't have children. Keep looking.
+
+            # If there's no more dashes, stop.
+            if i<0:
+                break
+
+            position = i + 1
+
+        if not module:
+            raise Exception('Invalid module "%s".' % self.get_full_module_name(module_name))
+
+        # Prepare module arguments.
+        if sub_command:
+            # If module command exists, include it as arguments: <module command> <args>...
+            module_args = [sub_command] + args[1:]
+
+        else:
+            # Otherwise, pass the original arguments: <args>...
+            module_args = args[1:]
+
+        module.init()
+        module.execute(module_args)