'''
Salt's pluggable authentication system

This sysetm allows for authentication to be managed in a module pluggable way
so that any external authentication system can be used inside of Salt
'''

# 1. Create auth loader instance
# 2. Accept arguments as a dict
# 3. Verify with function introspection
# 4. Execute function
# 5. Cache auth token with relative data
# 6. Interface to verify tokens

# Import Python libs
import inspect
#
# Import Salt libs
import salt.loader


def getargs(func):
    '''
    Returns a parsable data set from inspect.getargspec
    '''
    pass

class LoadAuth(object):
    '''
    Wrap the authentication system to handle periphrial components
    '''
    def __init__(self, opts):
        self.opts = opts
        self.auth = salt.loader.auth(opts)

    def auth(self, load):
        '''
        Return the token and set the cache data for use 
        '''
        pass

'''
Salt's pluggable authentication system

This sysetm allows for authentication to be managed in a module pluggable way
so that any external authentication system can be used inside of Salt
'''

# 1. Create auth loader instance
# 2. Accept arguments as a dict
# 3. Verify with function introspection
# 4. Execute auth function
# 5. Cache auth token with relative data opts['token_dir']
# 6. Interface to verify tokens

# Import Python libs
import time
import logging
import random
#
# Import Salt libs
import salt.loader
import salt.utils

log = logging.getLogger(__name__)


class LoadAuth(object):
    '''
    Wrap the authentication system to handle periphrial components
    '''
    def __init__(self, opts):
        self.opts = opts
        self.max_fail = 1.0
        self.auth = salt.loader.auth(opts)

    def auth_call(self, load):
        '''
        Return the token and set the cache data for use 
        '''
        if not 'fun' in load:
            return False
        fstr = '{0}.auth'.format(load['fun'])
        if not fstr in self.auth:
            return False
        fcall = salt.utils.format_call(self.auth[fstr], load)
        try:
            if 'kwargs' in fcall:
                return self.auth[fstr](*fcall['args'], **fcall['kwargs'])
            else:
                return self.auth[fstr](*fcall['args'])
        except Exception as exc:
            err = 'Authentication module threw an exception: {0}'.format(exc)
            log.critical(err)
            return False
        return False

    def auth(self, load):
        '''
        Make sure that all failures happen in the same amount of time
        '''
        start = time.time()
        ret = self.auth_call(load)
        if ret:
            return ret
        f_time = time.time() - start
        if f_time > self.max_fail:
            self.max_fail = f_time
        deviation = self.max_time / 4
        r_time = random.uniform(self.max_time - deviation, self.max_time + deviation)
        while start + r_time > time.time():
            time.sleep(0.001)
        return False


Add auth interface