[migration] don't handle data deletion anymore on schema changes
In most cases when we want to drop some entity/relation type, we don't care
whether hooks are called on their deletion. There is even low chances that some
hooks still exists, based on an old version of the schema. Last but not least,
this is horribly inefficient.
So this should be clearly documented and handled by application's programmer if
desired.
This patch removes unnecessary deletion (because table or column will be later
dropped) and reimplements the case of partial deletion (only one relation
definition among several, hence the database structure isn't modified) using
sql.
Only one test regarding deletion of inlined relation def is added as other cases
seem to be covered by existing tests.
Closes #7023315
# md5crypt.py
#
# 0423.2000 by michal wallace http://www.sabren.com/
# based on perl's Crypt::PasswdMD5 by Luis Munoz (lem@cantv.net)
# based on /usr/src/libcrypt/crypt.c from FreeBSD 2.2.5-RELEASE
#
# MANY THANKS TO
#
# Carey Evans - http://home.clear.net.nz/pages/c.evans/
# Dennis Marti - http://users.starpower.net/marti1/
#
# For the patches that got this thing working!
#
# modification by logilab:
# * remove usage of the string module
# * don't include the magic string in the output string
# for true crypt.crypt compatibility
# * use hashlib module instead of md5
#########################################################
"""md5crypt.py - Provides interoperable MD5-based crypt() function
SYNOPSIS
import md5crypt.py
cryptedpassword = md5crypt.md5crypt(password, salt);
DESCRIPTION
unix_md5_crypt() provides a crypt()-compatible interface to the
rather new MD5-based crypt() function found in modern operating systems.
It's based on the implementation found on FreeBSD 2.2.[56]-RELEASE and
contains the following license in it:
"THE BEER-WARE LICENSE" (Revision 42):
<phk@login.dknet.dk> wrote this file. As long as you retain this notice you
can do whatever you want with this stuff. If we meet some day, and you think
this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
"""
MAGIC = b'$1$' # Magic string
ITOA64 = b"./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
from hashlib import md5 # pylint: disable=E0611
from six import text_type, indexbytes
from six.moves import range
def to64 (v, n):
ret = bytearray()
while (n - 1 >= 0):
n = n - 1
ret.append(ITOA64[v & 0x3f])
v = v >> 6
return ret
def crypt(pw, salt):
if isinstance(pw, text_type):
pw = pw.encode('utf-8')
if isinstance(salt, text_type):
salt = salt.encode('ascii')
# Take care of the magic string if present
if salt.startswith(MAGIC):
salt = salt[len(MAGIC):]
# salt can have up to 8 characters:
salt = salt.split(b'$', 1)[0]
salt = salt[:8]
ctx = pw + MAGIC + salt
final = md5(pw + salt + pw).digest()
for pl in range(len(pw), 0, -16):
if pl > 16:
ctx = ctx + final[:16]
else:
ctx = ctx + final[:pl]
# Now the 'weird' xform (??)
i = len(pw)
while i:
if i & 1:
ctx = ctx + b'\0' #if ($i & 1) { $ctx->add(pack("C", 0)); }
else:
ctx = ctx + pw[0]
i = i >> 1
final = md5(ctx).digest()
# The following is supposed to make
# things run slower.
# my question: WTF???
for i in range(1000):
ctx1 = b''
if i & 1:
ctx1 = ctx1 + pw
else:
ctx1 = ctx1 + final[:16]
if i % 3:
ctx1 = ctx1 + salt
if i % 7:
ctx1 = ctx1 + pw
if i & 1:
ctx1 = ctx1 + final[:16]
else:
ctx1 = ctx1 + pw
final = md5(ctx1).digest()
# Final xform
passwd = b''
passwd += to64((indexbytes(final, 0) << 16)
|(indexbytes(final, 6) << 8)
|(indexbytes(final, 12)),4)
passwd += to64((indexbytes(final, 1) << 16)
|(indexbytes(final, 7) << 8)
|(indexbytes(final, 13)), 4)
passwd += to64((indexbytes(final, 2) << 16)
|(indexbytes(final, 8) << 8)
|(indexbytes(final, 14)), 4)
passwd += to64((indexbytes(final, 3) << 16)
|(indexbytes(final, 9) << 8)
|(indexbytes(final, 15)), 4)
passwd += to64((indexbytes(final, 4) << 16)
|(indexbytes(final, 10) << 8)
|(indexbytes(final, 5)), 4)
passwd += to64((indexbytes(final, 11)), 2)
return passwd