1 files changed, 35 insertions, 1 deletions
diff --git a/src/mailman/model/mailinglist.py b/src/mailman/model/mailinglist.py
index 488b6da3d..2b205775e 100644
--- a/src/mailman/model/mailinglist.py
+++ b/src/mailman/model/mailinglist.py
@@ -38,15 +38,19 @@ from zope.interface import implements
 from mailman.config import config
 from mailman.database.model import Model
 from mailman.database.types import Enum
+from mailman.interfaces.address import IAddress
 from mailman.interfaces.domain import IDomainManager
 from mailman.interfaces.languages import ILanguageManager
 from mailman.interfaces.mailinglist import (
     IAcceptableAlias, IAcceptableAliasSet, IMailingList, Personalization)
-from mailman.interfaces.member import MemberRole
+from mailman.interfaces.member import AlreadySubscribedError, MemberRole
 from mailman.interfaces.mime import FilterType
+from mailman.interfaces.user import IUser
 from mailman.model import roster
 from mailman.model.digests import OneLastDigest
+from mailman.model.member import Member
 from mailman.model.mime import ContentFilter
+from mailman.model.preferences import Preferences
 from mailman.utilities.filesystem import makedirs
 from mailman.utilities.string import expand
 
@@ -441,6 +445,36 @@ class MailingList(Model):
             raise TypeError(
                 'Undefined MemberRole: {0}'.format(role))
 
+    def subscribe(self, subscriber, role=MemberRole.member):
+        """See `IMailingList`."""
+        store = Store.of(self)
+        if IAddress.providedBy(subscriber):
+            member = store.find(
+                Member,
+                Member.role == role,
+                Member.mailing_list == self.fqdn_listname,
+                Member._address == subscriber).one()
+            if member:
+                raise AlreadySubscribedError(
+                    self.fqdn_listname, subscriber.email, role)
+        elif IUser.providedBy(subscriber):
+            member = store.find(
+                Member,
+                Member.role == role,
+                Member.mailing_list == self.fqdn_listname,
+                Member._user == subscriber).one()
+            if member:
+                raise AlreadySubscribedError(
+                    self.fqdn_listname, subscriber, role)
+        else:
+            raise ValueError('subscriber must be an address or user')
+        member = Member(role=role,
+                        mailing_list=self.fqdn_listname,
+                        subscriber=subscriber)
+        member.preferences = Preferences()
+        store.add(member)
+        return member
+
 
 
 class AcceptableAlias(Model):