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# Copyright 2010 Google Inc.

#

# Permission is hereby granted, free of charge, to any person obtaining a

# copy of this software and associated documentation files (the

# "Software"), to deal in the Software without restriction, including

# without limitation the rights to use, copy, modify, merge, publish, dis-

# tribute, sublicense, and/or sell copies of the Software, and to permit

# persons to whom the Software is furnished to do so, subject to the fol-

# lowing conditions:

#

# The above copyright notice and this permission notice shall be included

# in all copies or substantial portions of the Software.

#

# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABIL-

# ITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT

# SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,

# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS

# IN THE SOFTWARE.

"""

Implements plugin related api.

To define a new plugin just subclass Plugin, like this.

class AuthPlugin(Plugin):

pass

Then start creating subclasses of your new plugin.

class MyFancyAuth(AuthPlugin):

capability = ['sign', 'vmac']

The actual interface is duck typed.

"""

import glob

import imp

import os.path

class Plugin(object):

"""Base class for all plugins."""

capability = []

@classmethod

def is_capable(cls, requested_capability):

"""Returns true if the requested capability is supported by this plugin

"""

for c in requested_capability:

if c not in cls.capability:

return False

return True

def get_plugin(cls, requested_capability=None):

if not requested_capability:

requested_capability = []

result = []

for handler in cls.__subclasses__():

if handler.is_capable(requested_capability):

result.append(handler)

return result

def _import_module(filename):

(path, name) = os.path.split(filename)

(name, ext) = os.path.splitext(name)

(file, filename, data) = imp.find_module(name, [path])

try:

return imp.load_module(name, file, filename, data)

finally:

if file:

file.close()

_plugin_loaded = False

def load_plugins(config):

global _plugin_loaded

if _plugin_loaded:

return

_plugin_loaded = True

if not config.has_option('Plugin', 'plugin_directory'):

return

directory = config.get('Plugin', 'plugin_directory')

for file in glob.glob(os.path.join(directory, '*.py')):

_import_module(file)