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# -*- coding: utf-8 -*-
import StringIO
import hashlib
import sys
import os
import os.path
import fileinput
import logging
logger = logging.getLogger(__name__)
from permission import *
from config import config
class ObjectError(Exception):
pass;
class Object:
def __init__(self, hash):
self.hash = hash
self.object_path = os.path.join(config.root, hash[:2], hash[2:])
def exists(self):
return os.path.exists(self.object_path)
class ObjectReader(Object):
def __init__(self, hash):
Object.__init__(self, hash)
if not self.exists():
logger.error("Object {} can't be found for user {}".format(self.hash,
self.owner))
raise ObjectError
def get_permission(self, user):
with open(os.path.join(self.object_path, 'permissions'), 'r') as file:
for line in file:
name, perm, key = line.split()
if name == user:
return int(perm)
return None
def get_key(self, user):
with open(os.path.join(self.object_path, 'permissions'), 'r') as file:
for line in file:
name, perm, key = line.split()
if name == user:
return key
return None
def get_permission_key(self, user):
with open(os.path.join(self.object_path, 'permissions'), 'r') as file:
for line in file:
name, perm, key = line.split()
if name == user:
return (int(perm), key)
return (None, None)
def get_child_list(self, user):
perm = self.get_permission(user)
if not perm & LIST:
logger.error("User {} doesn't have the list permission for object {}"
.format(user, self.hash))
raise PermissionError
file = open(os.path.join(self.object_path, 'childs'), 'r')
result = []
for line in file:
name = line.rstrip('\n')
try:
child = ObjectReader(name)
except ObjectError:
logger.error('Object {} doesn\'t exist'.format(name))
else:
perm, key = child.get_permission_key(user)
if perm > 0:
result.append((name, perm, key))
file.close()
return result
def get_content(self, user):
"""Return object content and the user key to decrypt it."""
perm, key = self.get_permission_key(user)
if not perm & READ :
logger.error("User {} doesn't have read access to object {}"
.format(user, self.hash))
raise PermissionError
with open(os.path.join(self.object_path, 'object'), 'r') as file:
content = {}
for line in file:
k, v = line.split()
content[k] = v
#return content, key
return content
class ObjectWriter(ObjectReader):
def __init__(self, hash):
Object.__init__(self, hash)
#new object
if not self.exists():
os.makedirs(self.object_path)
for filename in ['permissions', 'children', 'object']:
file=open(os.path.join(self.object_path, filename), "w")
file.close()
def write(self, user, content):
perm = self.get_permission(user)
if not perm & MODIFY:
logger.error("User {} doesn't have the modify permission for object {}"
.format(user, self.hash))
raise PermissionError
with open(os.path.join(self.object_path, 'object'), "w") as file:
for k, v in content:
file.write('{} {}'.format(k,v))
def append(self, user, content, parent):
parent_object = ObjectReader(parent)
perm = parent_object.get_permission(user)
if not perm & APPEND:
logger.error("User {} doesn't have the modify permission for object {}"
.format(user, parent))
raise PermissionError
with open(os.path.join(self.object_path, 'object'), "w") as file:
for k, v in content:
file.write('{} {}\n'.format(k,v))
#add the child hash to the parent
with open(os.path.join(parent_object.object_path, 'children'), "a") as file:
file.write('{}\n'.format(self.hash))
def create_root_object(self, user, content):
with open(os.path.join(self.object_path, 'object'), "w") as file:
for k, v in content.iteritems():
file.write('{} {}\n'.format(k,v))
#give all the permissions to the user
with open(os.path.join(self.object_path, 'permissions'), "a") as file:
file.write('{} 15 xxxxxx\n'.format(user,v))
if __name__ == '__main__':
pass
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