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diff --git a/src/mailman/archiving/pipermail.py b/src/mailman/archiving/pipermail.py
new file mode 100644
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+++ b/src/mailman/archiving/pipermail.py
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+# Copyright (C) 2007-2009 by the Free Software Foundation, Inc.
+#
+# This file is part of GNU Mailman.
+#
+# GNU Mailman is free software: you can redistribute it and/or modify it under
+# the terms of the GNU General Public License as published by the Free
+# Software Foundation, either version 3 of the License, or (at your option)
+# any later version.
+#
+# GNU Mailman is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with
+# GNU Mailman.  If not, see <http://www.gnu.org/licenses/>.
+
+"""Pipermail archiver."""
+
+from __future__ import absolute_import, unicode_literals
+
+__metaclass__ = type
+__all__ = [
+    'Pipermail',
+    ]
+
+
+import os
+
+from cStringIO import StringIO
+from zope.interface import implements
+from zope.interface.interface import adapter_hooks
+
+from mailman.config import config
+from mailman.interfaces.archiver import IArchiver, IPipermailMailingList
+from mailman.interfaces.mailinglist import IMailingList
+from mailman.utilities.filesystem import makedirs
+from mailman.utilities.string import expand
+
+from mailman.Archiver.HyperArch import HyperArchive
+
+
+
+class PipermailMailingListAdapter:
+    """An adapter for MailingList objects to work with Pipermail."""
+
+    implements(IPipermailMailingList)
+
+    def __init__(self, mlist):
+        self._mlist = mlist
+
+    def __getattr__(self, name):
+        return getattr(self._mlist, name)
+
+    def archive_dir(self):
+        """See `IPipermailMailingList`."""
+        if self._mlist.archive_private:
+            basedir = config.PRIVATE_ARCHIVE_FILE_DIR
+        else:
+            basedir = config.PUBLIC_ARCHIVE_FILE_DIR
+        # Make sure the archive directory exists.
+        archive_dir = os.path.join(basedir, self._mlist.fqdn_listname)
+        makedirs(archive_dir)
+        return archive_dir
+
+
+def adapt_mailing_list_for_pipermail(iface, obj):
+    """Adapt `IMailingLists` to `IPipermailMailingList`.
+
+    :param iface: The interface to adapt to.
+    :type iface: `zope.interface.Interface`
+    :param obj: The object being adapted.
+    :type obj: any object
+    :return: An `IPipermailMailingList` instance if adaptation succeeded or
+        None if it didn't.
+    """
+    return (PipermailMailingListAdapter(obj)
+            if IMailingList.providedBy(obj) and iface is IPipermailMailingList
+            else None)
+
+adapter_hooks.append(adapt_mailing_list_for_pipermail)
+
+
+
+class Pipermail:
+    """The stock Pipermail archiver."""
+
+    implements(IArchiver)
+
+    name = 'pipermail'
+
+    @staticmethod
+    def list_url(mlist):
+        """See `IArchiver`."""
+        if mlist.archive_private:
+            url = mlist.script_url('private') + '/index.html'
+        else:
+            web_host = config.domains[mlist.host_name].url_host
+            return expand(config.archiver.pipermail.base_url,
+                          dict(listname=mlist.fqdn_listname,
+                               hostname=web_host,
+                               fqdn_listname=mlist.fqdn_listname,
+                               ))
+
+    @staticmethod
+    def permalink(mlist, message):
+        """See `IArchiver`."""
+        # Not currently implemented.
+        return None
+
+    @staticmethod
+    def archive_message(mlist, message):
+        """See `IArchiver`."""
+        text = str(message)
+        fileobj = StringIO(text)
+        h = HyperArchive(IPipermailMailingList(mlist))
+        h.processUnixMailbox(fileobj)
+        h.close()
+        fileobj.close()
+        # There's no good way to know the url for the archived message.
+        return None