Add basic config handling

1 files changed, 86 insertions, 0 deletions

diff --git a/src/leap/config/prefixers.py b/src/leap/config/prefixers.py
new file mode 100644
index 00000000..a33e68aa
--- /dev/null
+++ b/src/leap/config/prefixers.py
@@ -0,0 +1,86 @@
+# -*- coding: utf-8 -*-
+# prefixers.py
+# Copyright (C) 2013 LEAP
+#
+# 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/>.
+
+"""
+Platform dependant configuration path prefixers
+"""
+import os
+import platform
+
+from abc import ABCMeta, abstractmethod
+from xdg import BaseDirectory
+
+
+class Prefixer:
+    """
+    Abstract prefixer class
+    """
+
+    __metaclass__ = ABCMeta
+
+    @abstractmethod
+    def get_path_prefix(self, standalone=False):
+        """
+        Returns the platform dependant path prefixer
+
+        @param standalone: if True it will return the prefix for a
+        standalone application. Otherwise, it will return the system
+        default for configuration storage.
+        @param type: bool
+        """
+        return ""
+
+
+def get_platform_prefixer():
+    prefixer = globals()[platform.system() + "Prefixer"]
+    assert prefixer, "Unimplemented platform prefixer: %s" % \
+        (platform.system(),)
+    return prefixer()
+
+
+class LinuxPrefixer(Prefixer):
+    """
+    Config prefixer for the Linux platform
+    """
+
+    def get_path_prefix(self, standalone=False):
+        """
+        Returns the platform dependant path prefixer.
+        This method expects an env variable named LEAP_CLIENT_PATH if
+        standalone is used.
+
+        @param standalone: if True it will return the prefix for a
+        standalone application. Otherwise, it will return the system
+        default for configuration storage.
+        @param type: bool
+        """
+        config_dir = BaseDirectory.xdg_config_home
+        if not standalone:
+            return config_dir
+        return os.getenv("LEAP_CLIENT_PATH", config_dir)
+
+
+if __name__ == "__main__":
+    try:
+        abs_prefixer = Prefixer()
+    except Exception as e:
+        assert isinstance(e, TypeError), "Something went wrong"
+        print "Abstract Prefixer class is working as expected"
+
+    linux_prefixer = LinuxPrefixer()
+    print linux_prefixer.get_path_prefix(standalone=True)
+    print linux_prefixer.get_path_prefix()