Merge branch 'mam-update' into 'master'

MAM Update

See merge request poezio/slixmpp!149

9 files changed, 636 insertions, 142 deletions

diff --git a/slixmpp/plugins/__init__.py b/slixmpp/plugins/__init__.py
index d087f92b..55627113 100644
--- a/slixmpp/plugins/__init__.py
+++ b/slixmpp/plugins/__init__.py
@@ -110,5 +110,6 @@ __all__ = [
     'xep_0428',  # Message Fallback
     'xep_0437',  # Room Activity Indicators
     'xep_0439',  # Quick Response
+    'xep_0441',  # Message Archive Management Preferences
     'xep_0444',  # Message Reactions
 ]
diff --git a/slixmpp/plugins/xep_0059/rsm.py b/slixmpp/plugins/xep_0059/rsm.py
index 61752af4..085ee474 100644
--- a/slixmpp/plugins/xep_0059/rsm.py
+++ b/slixmpp/plugins/xep_0059/rsm.py
@@ -135,6 +135,9 @@ class ResultIterator(AsyncIterator):
                not r[self.recv_interface]['rsm']['last']:
                 raise StopAsyncIteration
 
+            if self.post_cb:
+                self.post_cb(r)
+
             if r[self.recv_interface]['rsm']['count'] and \
                r[self.recv_interface]['rsm']['first_index']:
                 count = int(r[self.recv_interface]['rsm']['count'])
@@ -147,9 +150,6 @@ class ResultIterator(AsyncIterator):
                 self.start = r[self.recv_interface]['rsm']['first']
             else:
                 self.start = r[self.recv_interface]['rsm']['last']
-
-            if self.post_cb:
-                self.post_cb(r)
             return r
         except XMPPError:
             raise StopAsyncIteration
diff --git a/slixmpp/plugins/xep_0313/__init__.py b/slixmpp/plugins/xep_0313/__init__.py
index eace3dc7..2b7f3273 100644
--- a/slixmpp/plugins/xep_0313/__init__.py
+++ b/slixmpp/plugins/xep_0313/__init__.py
@@ -5,8 +5,10 @@
 # See the file LICENSE for copying permissio
 from slixmpp.plugins.base import register_plugin
 
-from slixmpp.plugins.xep_0313.stanza import Result, MAM, Preferences
+from slixmpp.plugins.xep_0313.stanza import Result, MAM, Metadata
 from slixmpp.plugins.xep_0313.mam import XEP_0313
 
 
 register_plugin(XEP_0313)
+
+__all__ = ['XEP_0313', 'Result', 'MAM', 'Metadata']
diff --git a/slixmpp/plugins/xep_0313/mam.py b/slixmpp/plugins/xep_0313/mam.py
index eaa598a6..02efd3ce 100644
--- a/slixmpp/plugins/xep_0313/mam.py
+++ b/slixmpp/plugins/xep_0313/mam.py
@@ -5,8 +5,17 @@
 # See the file LICENSE for copying permission
 import logging
 
+from asyncio import Future
+from collections.abc import AsyncGenerator
 from datetime import datetime
-from typing import Any, Dict, Callable, Optional, Awaitable
+from typing import (
+    Any,
+    Awaitable,
+    Callable,
+    Dict,
+    Optional,
+    Tuple,
+)
 
 from slixmpp import JID
 from slixmpp.stanza import Message, Iq
@@ -15,6 +24,7 @@ from slixmpp.xmlstream.matcher import MatchXMLMask
 from slixmpp.xmlstream import register_stanza_plugin
 from slixmpp.plugins import BasePlugin
 from slixmpp.plugins.xep_0313 import stanza
+from slixmpp.plugins.xep_0004.stanza import Form
 
 
 log = logging.getLogger(__name__)
@@ -28,17 +38,25 @@ class XEP_0313(BasePlugin):
 
     name = 'xep_0313'
     description = 'XEP-0313: Message Archive Management'
-    dependencies = {'xep_0030', 'xep_0050', 'xep_0059', 'xep_0297'}
+    dependencies = {
+        'xep_0004', 'xep_0030', 'xep_0050', 'xep_0059', 'xep_0297'
+    }
     stanza = stanza
 
     def plugin_init(self):
+        register_stanza_plugin(stanza.MAM, Form)
         register_stanza_plugin(Iq, stanza.MAM)
-        register_stanza_plugin(Iq, stanza.Preferences)
         register_stanza_plugin(Message, stanza.Result)
         register_stanza_plugin(Iq, stanza.Fin)
-        register_stanza_plugin(stanza.Result, self.xmpp['xep_0297'].stanza.Forwarded)
+        register_stanza_plugin(
+            stanza.Result,
+            self.xmpp['xep_0297'].stanza.Forwarded
+        )
         register_stanza_plugin(stanza.MAM, self.xmpp['xep_0059'].stanza.Set)
         register_stanza_plugin(stanza.Fin, self.xmpp['xep_0059'].stanza.Set)
+        register_stanza_plugin(Iq, stanza.Metadata)
+        register_stanza_plugin(stanza.Metadata, stanza.Start)
+        register_stanza_plugin(stanza.Metadata, stanza.End)
 
     def retrieve(
             self,
@@ -66,16 +84,10 @@ class XEP_0313(BasePlugin):
         :param bool iterator: Use RSM and iterate over a paginated query
         :param dict rsm: RSM custom options
         """
-        iq = self.xmpp.Iq()
+        iq, stanza_mask = self._pre_mam_retrieve(
+            jid, start, end, with_jid, ifrom
+        )
         query_id = iq['id']
-
-        iq['to'] = jid
-        iq['from'] = ifrom
-        iq['type'] = 'set'
-        iq['mam']['queryid'] = query_id
-        iq['mam']['start'] = start
-        iq['mam']['end'] = end
-        iq['mam']['with'] = with_jid
         amount = 10
         if rsm:
             for key, value in rsm.items():
@@ -84,12 +96,6 @@ class XEP_0313(BasePlugin):
                     amount = value
         cb_data = {}
 
-        stanza_mask = self.xmpp.Message()
-        stanza_mask.xml.remove(stanza_mask.xml.find('{urn:xmpp:sid:0}origin-id'))
-        del stanza_mask['id']
-        del stanza_mask['lang']
-        stanza_mask['from'] = jid
-        stanza_mask['mam_result']['queryid'] = query_id
         xml_mask = str(stanza_mask)
 
         def pre_cb(query: Iq) -> None:
@@ -106,11 +112,14 @@ class XEP_0313(BasePlugin):
             results = cb_data['collector'].stop()
             if result['type'] == 'result':
                 result['mam']['results'] = results
+                result['mam_fin']['results'] = results
 
         if iterator:
-            return self.xmpp['xep_0059'].iterate(iq, 'mam', 'results', amount=amount,
-                                                 reverse=reverse, recv_interface='mam_fin',
-                                                 pre_cb=pre_cb, post_cb=post_cb)
+            return self.xmpp['xep_0059'].iterate(
+                iq, 'mam', 'results', amount=amount,
+                reverse=reverse, recv_interface='mam_fin',
+                pre_cb=pre_cb, post_cb=post_cb
+            )
 
         collector = Collector(
             'MAM_Results_%s' % query_id,
@@ -126,26 +135,144 @@ class XEP_0313(BasePlugin):
 
         return iq.send(timeout=timeout, callback=wrapped_cb)
 
-    def get_preferences(self, timeout=None, callback=None):
-        iq = self.xmpp.Iq()
-        iq['type'] = 'get'
+    async def iterate(
+            self,
+            jid: Optional[JID] = None,
+            start: Optional[datetime] = None,
+            end: Optional[datetime] = None,
+            with_jid: Optional[JID] = None,
+            ifrom: Optional[JID] = None,
+            reverse: bool = False,
+            rsm: Optional[Dict[str, Any]] = None,
+            total: Optional[int] = None,
+    ) -> AsyncGenerator:
+        """
+        Iterate over each message of MAM query.
+
+        :param jid: Entity holding the MAM records
+        :param start: MAM query start time
+        :param end: MAM query end time
+        :param with_jid: Filter results on this JID
+        :param ifrom: To change the from address of the query
+        :param reverse: Get the results in reverse order
+        :param rsm: RSM custom options
+        :param total: A number of messages received after which the query
+                      should stop.
+        """
+        iq, stanza_mask = self._pre_mam_retrieve(
+            jid, start, end, with_jid, ifrom
+        )
         query_id = iq['id']
-        iq['mam_prefs']['query_id'] = query_id
-        return iq.send(timeout=timeout, callback=callback)
-
-    def set_preferences(self, jid=None, default=None, always=None, never=None,
-                        ifrom=None, timeout=None, callback=None):
-        iq = self.xmpp.Iq()
-        iq['type'] = 'set'
-        iq['to'] = jid
-        iq['from'] = ifrom
-        iq['mam_prefs']['default'] = default
-        iq['mam_prefs']['always'] = always
-        iq['mam_prefs']['never'] = never
-        return iq.send(timeout=timeout, callback=callback)
-
-    def get_configuration_commands(self, jid, **kwargs):
-        return self.xmpp['xep_0030'].get_items(
-                jid=jid,
-                node='urn:xmpp:mam#configure',
-                **kwargs)
+        amount = 10
+
+        if rsm:
+            for key, value in rsm.items():
+                iq['mam']['rsm'][key] = str(value)
+                if key == 'max':
+                    amount = value
+        cb_data = {}
+
+        def pre_cb(query: Iq) -> None:
+            stanza_mask['mam_result']['queryid'] = query['id']
+            xml_mask = str(stanza_mask)
+            query['mam']['queryid'] = query['id']
+            collector = Collector(
+                'MAM_Results_%s' % query_id,
+                MatchXMLMask(xml_mask))
+            self.xmpp.register_handler(collector)
+            cb_data['collector'] = collector
+
+        def post_cb(result: Iq) -> None:
+            results = cb_data['collector'].stop()
+            if result['type'] == 'result':
+                result['mam']['results'] = results
+                result['mam_fin']['results'] = results
+
+        iterator = self.xmpp['xep_0059'].iterate(
+            iq, 'mam', 'results', amount=amount,
+            reverse=reverse, recv_interface='mam_fin',
+            pre_cb=pre_cb, post_cb=post_cb
+        )
+        recv_count = 0
+
+        async for page in iterator:
+            messages = [message for message in page['mam']['results']]
+            if reverse:
+                messages.reverse()
+            for message in messages:
+                yield message
+                recv_count += 1
+                if total is not None and recv_count >= total:
+                    break
+            if total is not None and recv_count >= total:
+                break
+
+    def _pre_mam_retrieve(
+            self,
+            jid: Optional[JID] = None,
+            start: Optional[datetime] = None,
+            end: Optional[datetime] = None,
+            with_jid: Optional[JID] = None,
+            ifrom: Optional[JID] = None,
+    ) -> Tuple[Iq, Message]:
+        """Build the IQ and stanza mask for MAM results
+        """
+        iq = self.xmpp.make_iq_set(ito=jid, ifrom=ifrom)
+        query_id = iq['id']
+        iq['mam']['queryid'] = query_id
+        iq['mam']['start'] = start
+        iq['mam']['end'] = end
+        iq['mam']['with'] = with_jid
+
+        stanza_mask = self.xmpp.Message()
+
+        auto_origin = stanza_mask.xml.find('{urn:xmpp:sid:0}origin-id')
+        if auto_origin is not None:
+            stanza_mask.xml.remove(auto_origin)
+        del stanza_mask['id']
+        del stanza_mask['lang']
+        stanza_mask['from'] = jid
+        stanza_mask['mam_result']['queryid'] = query_id
+
+        return (iq, stanza_mask)
+
+    async def get_fields(self, jid: Optional[JID] = None, **iqkwargs) -> Form:
+        """Get MAM query fields.
+
+        .. versionaddedd:: 1.8.0
+
+        :param jid: JID to retrieve the policy from.
+        :return: The Form of allowed options
+        """
+        ifrom = iqkwargs.pop('ifrom', None)
+        iq = self.xmpp.make_iq_get(ito=jid, ifrom=ifrom)
+        iq.enable('mam')
+        result = await iq.send(**iqkwargs)
+        return result['mam']['form']
+
+    async def get_configuration_commands(self, jid: Optional[JID],
+                                         **discokwargs) -> Future:
+        """Get the list of MAM advanced configuration commands.
+
+        .. versionchanged:: 1.8.0
+
+        :param jid: JID to get the commands from.
+        """
+        if jid is None:
+            jid = self.xmpp.boundjid.bare
+        return await self.xmpp['xep_0030'].get_items(
+            jid=jid,
+            node='urn:xmpp:mam#configure',
+            **discokwargs
+        )
+
+    def get_archive_metadata(self, jid: Optional[JID] = None,
+                             **iqkwargs) -> Future:
+        """Get the archive metadata from a JID.
+
+        :param jid: JID to get the metadata from.
+        """
+        ifrom = iqkwargs.pop('ifrom', None)
+        iq = self.xmpp.make_iq_get(ito=jid, ifrom=ifrom)
+        iq.enable('mam_metadata')
+        return iq.send(**iqkwargs)
diff --git a/slixmpp/plugins/xep_0313/stanza.py b/slixmpp/plugins/xep_0313/stanza.py
index 4e43eeba..6633717f 100644
--- a/slixmpp/plugins/xep_0313/stanza.py
+++ b/slixmpp/plugins/xep_0313/stanza.py
@@ -1,159 +1,342 @@
-
 # Slixmpp: The Slick XMPP Library
 # Copyright (C) 2012 Nathanael C. Fritz, Lance J.T. Stout
 # This file is part of Slixmpp.
 # See the file LICENSE for copying permissio
-import datetime as dt
-
+from datetime import datetime
+from typing import (
+    Any,
+    Iterable,
+    List,
+    Optional,
+    Set,
+    Union,
+)
+
+from slixmpp.stanza import Message
 from slixmpp.jid import JID
 from slixmpp.xmlstream import ElementBase, ET
-from slixmpp.plugins import xep_0082, xep_0004
+from slixmpp.plugins import xep_0082
 
 
 class MAM(ElementBase):
+    """A MAM Query element.
+
+    .. code-block:: xml
+
+        <iq type='set' id='juliet1'>
+          <query xmlns='urn:xmpp:mam:2'>
+            <x xmlns='jabber:x:data' type='submit'>
+              <field var='FORM_TYPE' type='hidden'>
+                <value>urn:xmpp:mam:2</value>
+              </field>
+              <field var='with'>
+                <value>juliet@capulet.lit</value>
+              </field>
+            </x>
+          </query>
+        </iq>
+
+    """
     name = 'query'
     namespace = 'urn:xmpp:mam:2'
     plugin_attrib = 'mam'
-    interfaces = {'queryid', 'start', 'end', 'with', 'results'}
-    sub_interfaces = {'start', 'end', 'with'}
+    #: Available interfaces:
+    #:
+    #: - ``queryid``: The MAM query id
+    #: - ``start`` and ``end``: Temporal boundaries of the query
+    #: - ``with``: JID of the other entity the conversation is with
+    #: - ``after_id``: Fetch stanzas after this specific ID
+    #: - ``before_id``: Fetch stanzas before this specific ID
+    #: - ``ids``: Fetch the stanzas matching those IDs
+    #: - ``results``: pseudo-interface used to accumulate MAM results during
+    #:   fetch, not relevant for the stanza itself.
+    interfaces = {
+        'queryid', 'start', 'end', 'with', 'results',
+        'before_id', 'after_id', 'ids',
+    }
+    sub_interfaces = {'start', 'end', 'with', 'before_id', 'after_id', 'ids'}
 
     def setup(self, xml=None):
         ElementBase.setup(self, xml)
-        self._form = xep_0004.stanza.Form()
-        self._form['type'] = 'submit'
-        field = self._form.add_field(var='FORM_TYPE', ftype='hidden',
-                             value='urn:xmpp:mam:2')
-        self.append(self._form)
-        self._results = []
-
-    def __get_fields(self):
-        return self._form.get_fields()
-
-    def get_start(self):
-        fields = self.__get_fields()
+        self._results: List[Message] = []
+
+    def _setup_form(self):
+        found = self.xml.find(
+                '{jabber:x:data}x/'
+                '{jabber:x:data}field[@var="FORM_TYPE"]/'
+                "{jabber:x:data}value[.='urn:xmpp:mam:2']"
+        )
+        if found is None:
+            self['form']['type'] = 'submit'
+            self['form'].add_field(
+                var='FORM_TYPE', ftype='hidden', value='urn:xmpp:mam:2'
+            )
+
+    def get_fields(self):
+        form = self.get_plugin('form', check=True)
+        if not form:
+            return {}
+        return form.get_fields()
+
+    def get_start(self) -> Optional[datetime]:
+        fields = self.get_fields()
         field = fields.get('start')
         if field:
             return xep_0082.parse(field['value'])
+        return None
 
-    def set_start(self, value):
-        if isinstance(value, dt.datetime):
+    def set_start(self, value: Union[str, datetime]):
+        self._setup_form()
+        if isinstance(value, datetime):
             value = xep_0082.format_datetime(value)
-        fields = self.__get_fields()
-        field = fields.get('start')
-        if field:
-            field['value'] = value
-        else:
-            field = self._form.add_field(var='start')
-            field['value'] = value
+        self.set_custom_field('start', value)
 
-    def get_end(self):
-        fields = self.__get_fields()
+    def get_end(self) -> Optional[datetime]:
+        fields = self.get_fields()
         field = fields.get('end')
         if field:
             return xep_0082.parse(field['value'])
+        return None
 
-    def set_end(self, value):
-        if isinstance(value, dt.datetime):
+    def set_end(self, value: Union[str, datetime]):
+        if isinstance(value, datetime):
             value = xep_0082.format_datetime(value)
-        fields = self.__get_fields()
-        field = fields.get('end')
-        if field:
-            field['value'] = value
-        else:
-            field = self._form.add_field(var='end')
-            field['value'] = value
+        self.set_custom_field('end', value)
 
-    def get_with(self):
-        fields = self.__get_fields()
+    def get_with(self) -> Optional[JID]:
+        fields = self.get_fields()
         field = fields.get('with')
         if field:
             return JID(field['value'])
+        return None
 
-    def set_with(self, value):
-        fields = self.__get_fields()
-        field = fields.get('with')
+    def set_with(self, value: JID):
+        self.set_custom_field('with', value)
+
+    def set_custom_field(self, fieldname: str, value: Any):
+        self._setup_form()
+        fields = self.get_fields()
+        field = fields.get(fieldname)
         if field:
-            field['with'] = str(value)
+            field['value'] = str(value)
         else:
-            field = self._form.add_field(var='with')
+            field = self['form'].add_field(var=fieldname)
             field['value'] = str(value)
+
+    def get_custom_field(self, fieldname: str) -> Optional[str]:
+        fields = self.get_fields()
+        field = fields.get(fieldname)
+        if field:
+            return field['value']
+        return None
+
+    def set_before_id(self, value: str):
+        self.set_custom_field('before-id', value)
+
+    def get_before_id(self):
+        self.get_custom_field('before-id')
+
+    def set_after_id(self, value: str):
+        self.set_custom_field('after-id', value)
+
+    def get_after_id(self):
+        self.get_custom_field('after-id')
+
+    def set_ids(self, value: List[str]):
+        self._setup_form()
+        fields = self.get_fields()
+        field = fields.get('ids')
+        if field:
+            field['ids'] = value
+        else:
+            field = self['form'].add_field(var='ids')
+            field['value'] = value
+
+    def get_ids(self):
+        self.get_custom_field('id')
+
     # The results interface is meant only as an easy
     # way to access the set of collected message responses
     # from the query.
 
-    def get_results(self):
+    def get_results(self) -> List[Message]:
         return self._results
 
-    def set_results(self, values):
+    def set_results(self, values: List[Message]):
         self._results = values
 
     def del_results(self):
         self._results = []
 
 
-class Preferences(ElementBase):
-    name = 'prefs'
+class Fin(ElementBase):
+    """A MAM fin element (end of query).
+
+    .. code-block:: xml
+
+        <iq type='result' id='juliet1'>
+          <fin xmlns='urn:xmpp:mam:2'>
+            <set xmlns='http://jabber.org/protocol/rsm'>
+              <first index='0'>28482-98726-73623</first>
+              <last>09af3-cc343-b409f</last>
+            </set>
+          </fin>
+        </iq>
+
+    """
+    name = 'fin'
     namespace = 'urn:xmpp:mam:2'
-    plugin_attrib = 'mam_prefs'
-    interfaces = {'default', 'always', 'never'}
-    sub_interfaces = {'always', 'never'}
+    plugin_attrib = 'mam_fin'
+    interfaces = {'results'}
 
-    def get_always(self):
-        results = set()
+    def setup(self, xml=None):
+        ElementBase.setup(self, xml)
+        self._results: List[Message] = []
 
-        jids = self.xml.findall('{%s}always/{%s}jid' % (
-            self.namespace, self.namespace))
+    # The results interface is meant only as an easy
+    # way to access the set of collected message responses
+    # from the query.
 
-        for jid in jids:
-            results.add(JID(jid.text))
+    def get_results(self) -> List[Message]:
+        return self._results
 
-        return results
+    def set_results(self, values: List[Message]):
+        self._results = values
+
+    def del_results(self):
+        self._results = []
 
-    def set_always(self, value):
-        self._set_sub_text('always', '', keep=True)
-        always = self.xml.find('{%s}always' % self.namespace)
-        always.clear()
 
-        if not isinstance(value, (list, set)):
-            value = [value]
+class Result(ElementBase):
+    """A MAM result payload.
+
+    .. code-block:: xml
+
+        <message id='aeb213' to='juliet@capulet.lit/chamber'>
+          <result xmlns='urn:xmpp:mam:2' queryid='f27' id='28482-98726-73623'>
+            <forwarded xmlns='urn:xmpp:forward:0'>
+              <delay xmlns='urn:xmpp:delay' stamp='2010-07-10T23:08:25Z'/>
+              <message xmlns='jabber:client' from="witch@shakespeare.lit"
+                       to="macbeth@shakespeare.lit">
+                <body>Hail to thee</body>
+              </message>
+            </forwarded>
+          </result>
+        </message>
+    """
+    name = 'result'
+    namespace = 'urn:xmpp:mam:2'
+    plugin_attrib = 'mam_result'
+    #: Available interfaces:
+    #:
+    #: - ``queryid``: MAM queryid
+    #: - ``id``: ID of the result
+    interfaces = {'queryid', 'id'}
 
-        for jid in value:
-            jid_xml = ET.Element('{%s}jid' % self.namespace)
-            jid_xml.text = str(jid)
-            always.append(jid_xml)
 
-    def get_never(self):
-        results = set()
+class Metadata(ElementBase):
+    """Element containing archive metadata
 
-        jids = self.xml.findall('{%s}never/{%s}jid' % (
-            self.namespace, self.namespace))
+    .. code-block:: xml
 
-        for jid in jids:
-            results.add(JID(jid.text))
+        <iq type='result' id='jui8921rr9'>
+          <metadata xmlns='urn:xmpp:mam:2'>
+            <start id='YWxwaGEg' timestamp='2008-08-22T21:09:04Z' />
+            <end id='b21lZ2Eg' timestamp='2020-04-20T14:34:21Z' />
+          </metadata>
+        </iq>
 
-        return results
+    """
+    name = 'metadata'
+    namespace = 'urn:xmpp:mam:2'
+    plugin_attrib = 'mam_metadata'
 
-    def set_never(self, value):
-        self._set_sub_text('never', '', keep=True)
-        never = self.xml.find('{%s}never' % self.namespace)
-        never.clear()
 
-        if not isinstance(value, (list, set)):
-            value = [value]
+class Start(ElementBase):
+    """Metadata about the start of an archive.
 
-        for jid in value:
-            jid_xml = ET.Element('{%s}jid' % self.namespace)
-            jid_xml.text = str(jid)
-            never.append(jid_xml)
+    .. code-block:: xml
 
+        <iq type='result' id='jui8921rr9'>
+          <metadata xmlns='urn:xmpp:mam:2'>
+            <start id='YWxwaGEg' timestamp='2008-08-22T21:09:04Z' />
+            <end id='b21lZ2Eg' timestamp='2020-04-20T14:34:21Z' />
+          </metadata>
+        </iq>
 
-class Fin(ElementBase):
-    name = 'fin'
+    """
+    name = 'start'
     namespace = 'urn:xmpp:mam:2'
-    plugin_attrib = 'mam_fin'
-
-class Result(ElementBase):
-    name = 'result'
+    plugin_attrib = name
+    #: Available interfaces:
+    #:
+    #: - ``id``: ID of the first message of the archive
+    #: - ``timestamp`` (``datetime``): timestamp of the first message of the
+    #:   archive
+    interfaces = {'id', 'timestamp'}
+
+    def get_timestamp(self) -> Optional[datetime]:
+        """Get the timestamp.
+
+        :returns: The timestamp.
+        """
+        stamp = self.xml.attrib.get('timestamp', None)
+        if stamp is not None:
+            return xep_0082.parse(stamp)
+        return stamp
+
+    def set_timestamp(self, value: Union[datetime, str]):
+        """Set the timestamp.
+
+        :param value: Value of the timestamp (either a datetime or a
+                      XEP-0082 timestamp string.
+        """
+        if isinstance(value, str):
+            value = xep_0082.parse(value)
+        value = xep_0082.format_datetime(value)
+        self.xml.attrib['timestamp'] = value
+
+
+class End(ElementBase):
+    """Metadata about the end of an archive.
+
+    .. code-block:: xml
+
+        <iq type='result' id='jui8921rr9'>
+          <metadata xmlns='urn:xmpp:mam:2'>
+            <start id='YWxwaGEg' timestamp='2008-08-22T21:09:04Z' />
+            <end id='b21lZ2Eg' timestamp='2020-04-20T14:34:21Z' />
+          </metadata>
+        </iq>
+
+    """
+    name = 'end'
     namespace = 'urn:xmpp:mam:2'
-    plugin_attrib = 'mam_result'
-    interfaces = {'queryid', 'id'}
+    plugin_attrib = name
+    #: Available interfaces:
+    #:
+    #: - ``id``: ID of the first message of the archive
+    #: - ``timestamp`` (``datetime``): timestamp of the first message of the
+    #:   archive
+    interfaces = {'id', 'timestamp'}
+
+    def get_timestamp(self) -> Optional[datetime]:
+        """Get the timestamp.
+
+        :returns: The timestamp.
+        """
+        stamp = self.xml.attrib.get('timestamp', None)
+        if stamp is not None:
+            return xep_0082.parse(stamp)
+        return stamp
+
+    def set_timestamp(self, value: Union[datetime, str]):
+        """Set the timestamp.
+
+        :param value: Value of the timestamp (either a datetime or a
+                      XEP-0082 timestamp string.
+        """
+        if isinstance(value, str):
+            value = xep_0082.parse(value)
+        value = xep_0082.format_datetime(value)
+        self.xml.attrib['timestamp'] = value
diff --git a/slixmpp/plugins/xep_0441/__init__.py b/slixmpp/plugins/xep_0441/__init__.py
new file mode 100644
index 00000000..0e169082
--- /dev/null
+++ b/slixmpp/plugins/xep_0441/__init__.py
@@ -0,0 +1,13 @@
+# Slixmpp: The Slick XMPP Library
+# Copyright (C) 2021 Mathieu Pasquet
+# This file is part of Slixmpp.
+# See the file LICENSE for copying permissio
+from slixmpp.plugins.base import register_plugin
+
+from slixmpp.plugins.xep_0441.stanza import Preferences
+from slixmpp.plugins.xep_0441.mam_prefs import XEP_0441
+
+
+register_plugin(XEP_0441)
+
+__all__ = ['XEP_0441', 'Preferences']
diff --git a/slixmpp/plugins/xep_0441/mam_prefs.py b/slixmpp/plugins/xep_0441/mam_prefs.py
new file mode 100644
index 00000000..06a830bc
--- /dev/null
+++ b/slixmpp/plugins/xep_0441/mam_prefs.py
@@ -0,0 +1,75 @@
+# Slixmpp: The Slick XMPP Library
+# Copyright (C) 2021 Mathieu Pasquet
+# This file is part of Slixmpp.
+# See the file LICENSE for copying permission
+import logging
+
+from asyncio import Future
+from typing import (
+    List,
+    Optional,
+    Tuple,
+)
+
+from slixmpp import JID
+from slixmpp.types import MAMDefault
+from slixmpp.stanza import Iq
+from slixmpp.xmlstream import register_stanza_plugin
+from slixmpp.plugins import BasePlugin
+from slixmpp.plugins.xep_0441 import stanza
+
+
+log = logging.getLogger(__name__)
+
+
+class XEP_0441(BasePlugin):
+
+    """
+    XEP-0441: Message Archive Management Preferences
+    """
+
+    name = 'xep_0441'
+    description = 'XEP-0441: Message Archive Management Preferences'
+    dependencies = {'xep_0313'}
+    stanza = stanza
+
+    def plugin_init(self):
+        register_stanza_plugin(Iq, stanza.Preferences)
+
+    async def get_preferences(self, **iqkwargs
+                              ) -> Tuple[MAMDefault, List[JID], List[JID]]:
+        """Get the current MAM preferences.
+
+        :returns: A tuple of MAM preferences with (default, always, never)
+        """
+        ifrom = iqkwargs.pop('ifrom', None)
+        ito = iqkwargs.pop('ito', None)
+        iq = self.xmpp.make_iq_get(ito=ito, ifrom=ifrom)
+        iq['type'] = 'get'
+        query_id = iq['id']
+        iq['mam_prefs']['query_id'] = query_id
+        result = await iq.send(**iqkwargs)
+        return (
+            result['mam_prefs']['default'],
+            result['mam_prefs']['always'],
+            result['mam_prefs']['never']
+        )
+
+    def set_preferences(self, default: Optional[MAMDefault] = 'roster',
+                        always: Optional[List[JID]] = None,
+                        never: Optional[List[JID]] = None, *,
+                        ito: Optional[JID] = None, ifrom: Optional[JID] = None,
+                        **iqkwargs) -> Future:
+        """Set MAM Preferences.
+
+        The server answer MAY contain different items.
+
+        :param default: Default behavior (one of 'always', 'never', 'roster').
+        :param always: List of JIDs whose messages will always be stored.
+        :param never: List of JIDs whose messages will never be stored.
+        """
+        iq = self.xmpp.make_iq_set(ito=ito, ifrom=ifrom)
+        iq['mam_prefs']['default'] = default
+        iq['mam_prefs']['always'] = always
+        iq['mam_prefs']['never'] = never
+        return iq.send(**iqkwargs)
diff --git a/slixmpp/plugins/xep_0441/stanza.py b/slixmpp/plugins/xep_0441/stanza.py
new file mode 100644
index 00000000..99dbe802
--- /dev/null
+++ b/slixmpp/plugins/xep_0441/stanza.py
@@ -0,0 +1,91 @@
+# Slixmpp: The Slick XMPP Library
+# Copyright (C) 2021 Mathieu Pasquet
+# This file is part of Slixmpp.
+# See the file LICENSE for copying permissio
+from typing import (
+    Iterable,
+    Set,
+)
+
+from slixmpp.jid import JID
+from slixmpp.xmlstream import ElementBase, ET
+
+
+class Preferences(ElementBase):
+    """MAM Preferences payload.
+
+    .. code-block:: xml
+
+        <iq type='set' id='juliet3'>
+          <prefs xmlns='urn:xmpp:mam:2' default='roster'>
+            <always>
+              <jid>romeo@montague.lit</jid>
+            </always>
+            <never>
+              <jid>montague@montague.lit</jid>
+            </never>
+          </prefs>
+        </iq>
+
+    """
+    name = 'prefs'
+    namespace = 'urn:xmpp:mam:2'
+    plugin_attrib = 'mam_prefs'
+    #: Available interfaces:
+    #:
+    #: - ``default``: Default MAM policy (must be one of 'roster', 'always',
+    #:   'never'
+    #: - ``always``  (``List[JID]``): list of JIDs to always store
+    #:   conversations with.
+    #: - ``never``  (``List[JID]``): list of JIDs to never store
+    #:   conversations with.
+    interfaces = {'default', 'always', 'never'}
+    sub_interfaces = {'always', 'never'}
+
+    def get_always(self) -> Set[JID]:
+        results = set()
+
+        jids = self.xml.findall('{%s}always/{%s}jid' % (
+            self.namespace, self.namespace))
+
+        for jid in jids:
+            results.add(JID(jid.text))
+
+        return results
+
+    def set_always(self, value: Iterable[JID]):
+        self._set_sub_text('always', '', keep=True)
+        always = self.xml.find('{%s}always' % self.namespace)
+        always.clear()
+
+        if not isinstance(value, (list, set)):
+            value = [value]
+
+        for jid in value:
+            jid_xml = ET.Element('{%s}jid' % self.namespace)
+            jid_xml.text = str(jid)
+            always.append(jid_xml)
+
+    def get_never(self) -> Set[JID]:
+        results = set()
+
+        jids = self.xml.findall('{%s}never/{%s}jid' % (
+            self.namespace, self.namespace))
+
+        for jid in jids:
+            results.add(JID(jid.text))
+
+        return results
+
+    def set_never(self, value: Iterable[JID]):
+        self._set_sub_text('never', '', keep=True)
+        never = self.xml.find('{%s}never' % self.namespace)
+        never.clear()
+
+        if not isinstance(value, (list, set)):
+            value = [value]
+
+        for jid in value:
+            jid_xml = ET.Element('{%s}jid' % self.namespace)
+            jid_xml.text = str(jid)
+            never.append(jid_xml)
diff --git a/slixmpp/types.py b/slixmpp/types.py
index b9a1d319..453d25e3 100644
--- a/slixmpp/types.py
+++ b/slixmpp/types.py
@@ -76,3 +76,5 @@ MucRoomItemKeys = Literal[
 OptJid = Optional[JID]
 JidStr = Union[str, JID]
 OptJidStr = Optional[Union[str, JID]]
+
+MAMDefault = Literal['always', 'never', 'roster']