author | martin f. krafft <madduck@madduck.net> |
Fri, 13 Apr 2012 23:24:12 +0200 (2012-04-13) | |
branch | v0.6.x |
changeset 527 | e09139525580 |
parent 425 | 8394e222aba3 |
child 568 | 14abdd04ddf5 |
permissions | -rw-r--r-- |
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# -*- coding: UTF-8 -*- |
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# Copyright (c) 2007 - 2011, Pascal Volk |
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# See COPYING for distribution information. |
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""" |
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VirtualMailManager.alias |
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~~~~~~~~~~~~~~~~~~~~~~~~ |
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Virtual Mail Manager's Alias class to manage e-mail aliases. |
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""" |
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from VirtualMailManager.domain import get_gid |
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from VirtualMailManager.emailaddress import \ |
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EmailAddress, DestinationEmailAddress as DestAddr |
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from VirtualMailManager.errors import AliasError as AErr |
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from VirtualMailManager.ext.postconf import Postconf |
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from VirtualMailManager.pycompat import all |
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from VirtualMailManager.constants import \ |
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ALIAS_EXCEEDS_EXPANSION_LIMIT, NO_SUCH_ALIAS, NO_SUCH_DOMAIN |
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_ = lambda msg: msg |
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cfg_dget = lambda option: None |
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class Alias(object): |
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"""Class to manage e-mail aliases.""" |
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__slots__ = ('_addr', '_dests', '_gid', '_dbh') |
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def __init__(self, dbh, address): |
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assert isinstance(address, EmailAddress) |
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self._addr = address |
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self._dbh = dbh |
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self._gid = get_gid(self._dbh, self._addr.domainname) |
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if not self._gid: |
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raise AErr(_(u"The domain '%s' does not exist.") % |
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self._addr.domainname, NO_SUCH_DOMAIN) |
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self._dests = [] |
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self._load_dests() |
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def _load_dests(self): |
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"""Loads all known destination addresses into the _dests list.""" |
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dbc = self._dbh.cursor() |
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dbc.execute('SELECT destination FROM alias WHERE gid = %s AND ' |
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'address = %s', (self._gid, self._addr.localpart)) |
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dests = dbc.fetchall() |
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if dbc.rowcount > 0: |
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self._dests.extend(DestAddr(dest[0], self._dbh) for dest in dests) |
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dbc.close() |
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def _check_expansion(self, count_new): |
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"""Checks the current expansion limit of the alias.""" |
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postconf = Postconf(cfg_dget('bin.postconf')) |
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limit = long(postconf.read('virtual_alias_expansion_limit')) |
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dcount = len(self._dests) |
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failed = False |
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if dcount == limit or dcount + count_new > limit: |
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failed = True |
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errmsg = _( |
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u"""Cannot add %(count_new)i new destination(s) to alias '%(address)s'. |
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Currently this alias expands into %(count)i/%(limit)i recipients. |
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%(count_new)i additional destination(s) will render this alias unusable. |
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Hint: Increase Postfix' virtual_alias_expansion_limit""") |
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elif dcount > limit: |
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failed = True |
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errmsg = _( |
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u"""Cannot add %(count_new)i new destination(s) to alias '%(address)s'. |
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This alias already exceeds its expansion limit (%(count)i/%(limit)i). |
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So its unusable, all messages addressed to this alias will be bounced. |
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Hint: Delete some destination addresses.""") |
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if failed: |
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raise AErr(errmsg % {'address': self._addr, 'count': dcount, |
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'limit': limit, 'count_new': count_new}, |
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ALIAS_EXCEEDS_EXPANSION_LIMIT) |
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def _delete(self, destination=None): |
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"""Deletes a destination from the alias, if ``destination`` is |
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not ``None``. If ``destination`` is None, the alias with all |
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its destination addresses will be deleted. |
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""" |
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dbc = self._dbh.cursor() |
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if not destination: |
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dbc.execute('DELETE FROM alias WHERE gid = %s AND address = %s', |
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(self._gid, self._addr.localpart)) |
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else: |
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dbc.execute('DELETE FROM alias WHERE gid = %s AND address = %s ' |
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'AND destination = %s', |
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(self._gid, self._addr.localpart, str(destination))) |
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if dbc.rowcount > 0: |
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self._dbh.commit() |
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dbc.close() |
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def __len__(self): |
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"""Returns the number of destinations of the alias.""" |
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return len(self._dests) |
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@property |
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def address(self): |
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"""The Alias' EmailAddress instance.""" |
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return self._addr |
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102 |
|
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103 |
def add_destinations(self, destinations, warnings=None): |
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104 |
"""Adds the `EmailAddress`es from *destinations* list to the |
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105 |
destinations of the alias. |
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106 |
|
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107 |
Destinations, that are already assigned to the alias, will be |
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108 |
removed from *destinations*. When done, this method will return |
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109 |
a set with all destinations, that were saved in the database. |
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110 |
""" |
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111 |
destinations = set(destinations) |
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112 |
assert destinations and \ |
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113 |
all(isinstance(dest, EmailAddress) for dest in destinations) |
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114 |
if not warnings is None: |
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115 |
assert isinstance(warnings, list) |
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116 |
if self._addr in destinations: |
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117 |
destinations.remove(self._addr) |
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118 |
if not warnings is None: |
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119 |
warnings.append(self._addr) |
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120 |
duplicates = destinations.intersection(set(self._dests)) |
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121 |
if duplicates: |
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122 |
destinations.difference_update(set(self._dests)) |
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123 |
if not warnings is None: |
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124 |
warnings.extend(duplicates) |
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125 |
if not destinations: |
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126 |
return destinations |
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127 |
self._check_expansion(len(destinations)) |
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128 |
dbc = self._dbh.cursor() |
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129 |
dbc.executemany("INSERT INTO alias (gid, address, destination) " |
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130 |
"VALUES (%d, '%s', %%s)" % (self._gid, |
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131 |
self._addr.localpart), |
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132 |
((str(destination),) for destination in destinations)) |
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133 |
self._dbh.commit() |
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134 |
dbc.close() |
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135 |
self._dests.extend(destinations) |
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136 |
return destinations |
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137 |
|
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138 |
def del_destination(self, destination): |
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139 |
"""Deletes the specified ``destination`` address from the alias.""" |
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140 |
assert isinstance(destination, EmailAddress) |
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141 |
if not self._dests: |
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142 |
raise AErr(_(u"The alias '%s' does not exist.") % self._addr, |
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|
143 |
NO_SUCH_ALIAS) |
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144 |
if not destination in self._dests: |
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145 |
raise AErr(_(u"The address '%(addr)s' is not a destination of " |
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|
146 |
u"the alias '%(alias)s'.") % {'addr': destination, |
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147 |
'alias': self._addr}, NO_SUCH_ALIAS) |
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|
148 |
self._delete(destination) |
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149 |
self._dests.remove(destination) |
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150 |
|
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151 |
def get_destinations(self): |
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152 |
"""Returns an iterator for all destinations of the alias.""" |
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153 |
if not self._dests: |
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154 |
raise AErr(_(u"The alias '%s' does not exist.") % self._addr, |
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|
155 |
NO_SUCH_ALIAS) |
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156 |
return iter(self._dests) |
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157 |
|
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158 |
def delete(self): |
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159 |
"""Deletes the alias with all its destinations.""" |
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160 |
if not self._dests: |
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161 |
raise AErr(_(u"The alias '%s' does not exist.") % self._addr, |
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|
162 |
NO_SUCH_ALIAS) |
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163 |
self._delete() |
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|
164 |
del self._dests[:] |
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|
165 |
|
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|
166 |
del _, cfg_dget |