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# -*- coding: utf-8 -*-
import StringIO
import hashlib
import sys
import os
import os.path
import zlib
import datetime
import fileinput
import logging
from permission import *
from config import config
class Object:
def __get_path(self):
return self.name[:2] + '/' + self.name[2:]
def __create_dir(self):
if (not os.path.exists(self.name[:2])):
os.mkdir(self.name[:2])
if (not os.path.exists(self.path)):
os.mkdir(self.path)
##
# Save the object on the disk.
def save(self):
self.__createDir()
header = "author " + self.data['author'] + "\n"
header += "parent " + self.data['parent'] + "\n"
header += "created " + self.data['created'] + "\n"
header += "#\n" #end of header
store = header + self.data['content']
file = open(self.path + "/object", 'w')
file.write(zlib.compress(store))
file.close()
os.mknod(self.path + "/childs")
os.mknod(self.path + "/permissions")
self.saved = True
##
# Class constructor.
def __init__(self, init):
if isinstance(init, dict):
if 'author' not in init:
init['author'] = 'None'
if 'parent' not in init:
init['parent'] = 'None'
if 'content' not in init:
init['content'] = 'None'
self.data = init
self.data['created'] = str(datetime.datetime.now())
self.name = hashlib.sha1(str(self.data)).hexdigest()
self.path = self.__getPath()
self.saved = False
elif isinstance(init, str):
if (os.path.exists(init)):
file = open(self.path + '/object', 'r')
contentStream = StringIO.StringIO(zlib.decompress(file.read()))
data = {}
for line in contentStream:
if (line == "#\n"):
data['content'] = contentStream.read()
break
else:
key, sep, value = line.rstrip('\n').partition(' ')
data[key] = value
self.data = data
file.close()
def append_to(self, father):
father.appendChild(self)
def append_child(self, child):
if not self.saved:
self.save()
file = open(self.path + "/childs", 'a')
file.write(child.name + "\n")
file.close()
@staticmethod
def get_permission_by_hash(hash, user):
path = hash[:2] + '/' + hash[2:]
try:
file = open(path + '/permissions', 'r')
except IOError:
print 'cannot open', path
else:
for line in file:
name, sep, perm = line.rstrip('\n').partition(' ')
if name == user:
return perm
return 0
def get_permission(self, user):
file = open(self.path + '/permissions', 'r')
for line in file:
name, sep, perm = line.rstrip('\n').partition(' ')
if name == user:
return perm
return 0
def set_permission(self, user, permission):
if not self.saved:
self.save()
sentinel = False
for line in fileinput.input(self.path + "/permissions", inplace = 1):
name, sep, perm = line.rstrip('\n').partition(' ')
if name == user:
sys.stdout.write(name + ' ' + str(permission) + '\n')
sentinel = True
else:
sys.stdout.write(line)
if not sentinel:
file = open(self.path + '/permissions', 'a')
file.write(user + ' ' + str(permission) + '\n')
file.close()
class ObjectHandler:
def __init__(self, user):
self.user = user
self.root_directory = config.root + user + '/'
self.root_object = hashlib.sha1(user).hexdigest()
if not os.path.exists(self.root_directory):
logging.error("User %s root doesn't exist" % self.user)
def get_object_directory(self, hash):
directory = self.root_directory + hash[:2] + '/' + hash[2:]
if (os.path.exists(directory)):
return directory
else :
return None
def get_object(self, hash):
directory = self.get_object_directory(hash)
if directory is None :
logging.error("Object %s doesn't exist" % hash)
else :
return Object(directory)
#return a list of hash,permission pairs
def get_child_list(self, hash, user):
directory = self.get_object_directory(hash)
if (directory) :
result = []
file = open(directory + "/childs", 'r')
for line in file :
name = line.rstrip('\n')
result.append(name)
file.close()
return result
else :
return None
def create_home_node(self):
pass
def get_home_node(self):
return self.root_object
if __name__ == '__main__':
x = Object({'parent' : 'toto', 'author' : 'Zaran'})
x.setPermission("test", READ)
x.setPermission("toto", READ | MODIFY)
x.setPermission("toto", READ | MODIFY | APPEND)
x.setPermission("toto2", READ | MODIFY | APPEND)
print x.getPermission("toto")
print Object.getPermissionByHash(x.name, "toto")
child = Object({'parent' : x.name, 'author' : 'Zaran'})
child.save()
x.appendChild(child)
y = Object(x.name)
print y.data['author']
print y.data['parent']
print y.data['content']
print y.data['created']
|
