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1 # -*- coding: UTF-8 -*- |
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2 # Copyright (c) 2012 martin f. krafft |
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3 # See COPYING for distribution information. |
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4 """ |
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5 VirtualMailManager.catchall |
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6 ~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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7 |
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8 Virtual Mail Manager's CatchallAlias class to manage domain catch-all |
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9 aliases. |
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10 |
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11 This is heavily based on (more or less a copy of) the Alias class, because |
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12 fundamentally, catchall aliases are aliases, but without a localpart. |
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13 While Alias could potentially derive from CatchallAlias to reuse some of |
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14 the functionality, it's probably not worth it. I found no sensible way to |
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15 derive CatchallAlias from Alias, or at least none that would harness the |
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16 powers of polymorphism. |
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17 |
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18 Yet, we reuse the AliasError exception class, which makes sense. |
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19 """ |
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20 |
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21 from VirtualMailManager.domain import get_gid |
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22 from VirtualMailManager.emailaddress import \ |
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23 EmailAddress, DestinationEmailAddress as DestAddr |
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24 from VirtualMailManager.errors import AliasError as AErr |
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25 from VirtualMailManager.ext.postconf import Postconf |
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26 from VirtualMailManager.pycompat import all |
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27 from VirtualMailManager.constants import \ |
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28 ALIAS_EXCEEDS_EXPANSION_LIMIT, NO_SUCH_ALIAS, NO_SUCH_DOMAIN |
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29 |
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30 |
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31 _ = lambda msg: msg |
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32 cfg_dget = lambda option: None |
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33 |
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34 |
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35 class CatchallAlias(object): |
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36 """Class to manage domain catch-all aliases.""" |
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37 __slots__ = ('_domain', '_dests', '_gid', '_dbh') |
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38 |
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39 def __init__(self, dbh, domain): |
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40 self._domain = domain |
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41 self._dbh = dbh |
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42 self._gid = get_gid(self._dbh, self._addr.domain) |
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43 if not self._gid: |
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44 raise AErr(_(u"The domain '%s' does not exist.") % |
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45 self._addr.domainname, NO_SUCH_DOMAIN) |
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46 self._dests = [] |
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47 |
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48 self._load_dests() |
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49 |
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50 def _load_dests(self): |
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51 """Loads all known destination addresses into the _dests list.""" |
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52 dbc = self._dbh.cursor() |
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53 dbc.execute('SELECT destination FROM catchall WHERE gid = %s', |
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54 self._gid) |
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55 dests = dbc.fetchall() |
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56 if dbc.rowcount > 0: |
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57 self._dests.extend(DestAddr(dest[0], self._dbh) for dest in dests) |
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58 dbc.close() |
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59 |
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60 def _check_expansion(self, count_new): |
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61 """Checks the current expansion limit of the alias.""" |
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62 postconf = Postconf(cfg_dget('bin.postconf')) |
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63 limit = long(postconf.read('virtual_alias_expansion_limit')) |
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64 dcount = len(self._dests) |
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65 failed = False |
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66 if dcount == limit or dcount + count_new > limit: |
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67 failed = True |
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68 errmsg = _( |
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69 u"""Cannot add %(count_new)i new destination(s) to catchall alias for |
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70 domain '%(domain)s'. Currently this alias expands into %(count)i/%(limit)i |
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71 recipients. %(count_new)i additional destination(s) will render this alias |
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72 unusable. |
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73 Hint: Increase Postfix' virtual_alias_expansion_limit""") |
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74 elif dcount > limit: |
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75 failed = True |
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76 errmsg = _( |
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77 u"""Cannot add %(count_new)i new destination(s) to catchall alias for |
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78 domain '%(domain)s'. This alias already exceeds its expansion limit (%(count)i/%(limit)i). |
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79 So its unusable, all messages addressed to this alias will be bounced. |
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80 Hint: Delete some destination addresses.""") |
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81 if failed: |
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82 raise AErr(errmsg % {'domain': self._domain, 'count': dcount, |
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83 'limit': limit, 'count_new': count_new}, |
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84 ALIAS_EXCEEDS_EXPANSION_LIMIT) |
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85 |
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86 def _delete(self, destination=None): |
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87 """Deletes a destination from the catchall alias, if ``destination`` |
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88 is not ``None``. If ``destination`` is None, the catchall alias with |
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89 all its destination addresses will be deleted. |
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90 |
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91 """ |
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92 dbc = self._dbh.cursor() |
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93 if not destination: |
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94 dbc.execute('DELETE FROM catchall WHERE gid = %s', self._gid) |
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95 else: |
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96 dbc.execute('DELETE FROM catchall WHERE gid = %s ' |
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97 'AND destination = %s', (self._gid, str(destination))) |
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98 if dbc.rowcount > 0: |
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99 self._dbh.commit() |
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100 dbc.close() |
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101 |
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102 def __len__(self): |
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103 """Returns the number of destinations of the catchall alias.""" |
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104 return len(self._dests) |
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105 |
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106 @property |
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107 def domain(self): |
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108 """The Alias' domain.""" |
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109 return self._domain |
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110 |
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111 def add_destinations(self, destinations, warnings=None): |
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112 """Adds the `EmailAddress`es from *destinations* list to the |
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113 destinations of the catchall alias. |
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114 |
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115 Destinations, that are already assigned to the alias, will be |
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116 removed from *destinations*. When done, this method will return |
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117 a set with all destinations, that were saved in the database. |
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118 """ |
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119 destinations = set(destinations) |
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120 assert destinations and \ |
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121 all(isinstance(dest, EmailAddress) for dest in destinations) |
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122 if not warnings is None: |
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123 assert isinstance(warnings, list) |
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124 duplicates = destinations.intersection(set(self._dests)) |
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125 if duplicates: |
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126 destinations.difference_update(set(self._dests)) |
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127 if not warnings is None: |
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128 warnings.extend(duplicates) |
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129 if not destinations: |
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130 return destinations |
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131 self._check_expansion(len(destinations)) |
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132 dbc = self._dbh.cursor() |
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133 dbc.executemany("INSERT INTO catchall (gid, destination) " |
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134 "VALUES (%d, %%s)" % self._gid, |
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135 ((str(destination),) for destination in destinations)) |
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136 self._dbh.commit() |
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137 dbc.close() |
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138 self._dests.extend(destinations) |
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139 return destinations |
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140 |
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141 def del_destination(self, destination): |
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142 """Deletes the specified ``destination`` address from the catchall |
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143 alias.""" |
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144 assert isinstance(destination, EmailAddress) |
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145 if not self._dests: |
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146 raise AErr(_(u"There are no catchall aliases defined for " |
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147 u"domain '%s'.") % self._domain, NO_SUCH_ALIAS) |
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148 if not destination in self._dests: |
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149 raise AErr(_(u"The address '%(addr)s' is not a destination of " |
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150 u"the catchall alias for domain '%(domain)s'.") |
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151 % {'addr': destination, 'domain': self._domain}, |
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152 NO_SUCH_ALIAS) |
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153 self._delete(destination) |
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154 self._dests.remove(destination) |
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155 |
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156 def get_destinations(self): |
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157 """Returns an iterator for all destinations of the catchall alias.""" |
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158 if not self._dests: |
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159 raise AErr(_(u"There are no catchall aliases defined for " |
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160 u"domain '%s'.") % self._domain, NO_SUCH_ALIAS) |
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161 return iter(self._dests) |
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162 |
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163 def delete(self): |
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164 """Deletes all catchall destinations for the domain.""" |
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165 if not self._dests: |
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166 raise AErr(_(u"There are no catchall aliases defined for " |
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167 u"domain '%s'.") % self._domain, NO_SUCH_ALIAS) |
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168 self._delete() |
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169 del self._dests[:] |
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170 |
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171 del _, cfg_dget |