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# -*- coding: utf-8 -*-
import StringIO
import hashlib
import sys
import os
import os.path
import zlib
import datetime
import fileinput
from permission import *
OBJECT_ROOT = 'objects/'
class Object :
def _getPath( self ) :
return self.name[:2] + '/' + self.name[2:]
def _createDir( 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 ) :
self.name = init
self.path = self._getPath()
self.saved = True
if ( os.path.exists( self.path ) ) :
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 appendTo(self, father) :
father.appendChild(self)
def appendChild(self, child) :
if not self.saved :
self.save()
file = open( self.path + "/childs", 'a' )
file.write( child.name + "\n")
file.close()
@staticmethod
def getPermissionByHash( 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 getPermission( 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 setPermission(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 = OBJECT_ROOT + user + '/'
def getDirectory( self, hash ) :
directory = self.root + hash[:2] + '/' + hash[2:]
if ( os.path.exists( directory ) ) :
return directory
else :
return None
#return a list of hash,permission pairs
def getChildList( self, hash, user) :
directory = self.getDirectory( hash )
if ( directory ) :
result = []
file = open( directory + "/childs", 'r' )
for line in file :
name, sep, perm = line.rstrip('\n').partition(' ')
if name == user :
result.append( ( name, int(perm) ) )
file.close()
return result
else :
return None
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']
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