Added new XEP-0059 plugin.

Contributed by Erik Reuterborg Larsson (who).

3 files changed, 236 insertions, 0 deletions

diff --git a/sleekxmpp/plugins/xep_0059/__init__.py b/sleekxmpp/plugins/xep_0059/__init__.py
new file mode 100644
index 00000000..3a9b8edf
--- /dev/null
+++ b/sleekxmpp/plugins/xep_0059/__init__.py
@@ -0,0 +1,10 @@
+"""
+    SleekXMPP: The Sleek XMPP Library
+    Copyright (C) 2010 Nathanael C. Fritz, Erik Reuterborg Larsson
+    This file is part of SleekXMPP.
+
+    See the file LICENSE for copying permission.
+"""
+
+from sleekxmpp.plugins.xep_0059.stanza import Set
+from sleekxmpp.plugins.xep_0059.rsm import ResultIterator, xep_0059
diff --git a/sleekxmpp/plugins/xep_0059/rsm.py b/sleekxmpp/plugins/xep_0059/rsm.py
new file mode 100644
index 00000000..4a01596e
--- /dev/null
+++ b/sleekxmpp/plugins/xep_0059/rsm.py
@@ -0,0 +1,118 @@
+"""
+    SleekXMPP: The Sleek XMPP Library
+    Copyright (C) 2010 Nathanael C. Fritz, Erik Reuterborg Larsson
+    This file is part of SleekXMPP.
+
+    See the file LICENSE for copying permission.
+"""
+
+import logging
+
+import sleekxmpp
+from sleekxmpp import Iq
+from sleekxmpp.plugins.base import base_plugin
+from sleekxmpp.xmlstream import register_stanza_plugin
+from sleekxmpp.plugins.xep_0059 import Set
+
+
+log = logging.getLogger(__name__)
+
+
+class ResultIterator():
+
+    """
+    An iterator for Result Set Managment
+    """
+
+    def __init__(self, query, interface, amount=10, start=None, reverse=False):
+        """
+        Arguments:
+           query     -- The template query
+           interface -- The substanza of the query, for example disco_items
+           amount    -- The max amounts of items to request per iteration
+           start     -- From which item id to start
+           reverse   -- If True, page backwards through the results
+
+        Example:
+           q = Iq()
+           q['to'] = 'pubsub.example.com'
+           q['disco_items']['node'] = 'blog'
+           for i in ResultIterator(q, 'disco_items', '10'):
+               print i['disco_items']['items']
+
+        """
+        self.query = query
+        self.amount = amount
+        self.start = start
+        self.interface = interface
+        self.reverse = reverse
+
+    def __iter__(self):
+        return self
+
+    def __next__(self):
+        return self.next()
+
+    def next(self):
+        """
+        Return the next page of results from a query.
+
+        Note: If using backwards paging, then the next page of
+              results will be the items before the current page
+              of items.
+        """
+        self.query[self.interface]['rsm']['before'] = self.reverse
+        self.query['id'] = self.query.stream.new_id()
+        self.query[self.interface]['rsm']['max'] = str(self.amount)
+
+        if self.start and self.reverse:
+            self.query[self.interface]['rsm']['before'] = self.start
+        elif self.start:
+            self.query[self.interface]['rsm']['after'] = self.start
+
+        r = self.query.send(block=True)
+
+        if not r or not r[self.interface]['rsm']['first'] and \
+           not r[self.interface]['rsm']['last']:
+            raise StopIteration
+
+        if self.reverse:
+            self.start = r[self.interface]['rsm']['first']
+        else:
+            self.start = r[self.interface]['rsm']['last']
+
+        return r
+
+
+class xep_0059(base_plugin):
+
+    """
+    XEP-0050: Result Set Management
+    """
+
+    def plugin_init(self):
+        """
+        Start the XEP-0059 plugin.
+        """
+        self.xep = '0059'
+        self.description = 'Result Set Management'
+        self.stanza = sleekxmpp.plugins.xep_0059.stanza
+
+    def post_init(self):
+        """Handle inter-plugin dependencies."""
+        self.xmpp['xep_0030'].add_feature(Set.namespace)
+
+    def iterate(self, stanza, interface):
+        """
+        Create a new result set iterator for a given stanza query.
+
+        Arguments:
+            stanza    -- A stanza object to serve as a template for
+                         queries made each iteration. For example, a
+                         basic disco#items query.
+            interface -- The name of the substanza to which the
+                         result set management stanza should be
+                         appended. For example, for disco#items queries
+                         the interface 'disco_items' should be used.
+        """
+        return ResultIterator(stanza, interface)
diff --git a/sleekxmpp/plugins/xep_0059/stanza.py b/sleekxmpp/plugins/xep_0059/stanza.py
new file mode 100644
index 00000000..7c637d0b
--- /dev/null
+++ b/sleekxmpp/plugins/xep_0059/stanza.py
@@ -0,0 +1,108 @@
+"""
+    SleekXMPP: The Sleek XMPP Library
+    Copyright (C) 2010 Nathanael C. Fritz, Erik Reuterborg Larsson
+    This file is part of SleekXMPP.
+
+    See the file LICENSE for copying permission.
+"""
+
+from sleekxmpp.xmlstream import ElementBase, ET
+from sleekxmpp.plugins.xep_0030.stanza.items import DiscoItems
+
+
+class Set(ElementBase):
+
+    """
+    XEP-0059 (Result Set Managment) can be used to manage the
+    results of queries. For example, limiting the number of items
+    per response or starting at certain positions.
+
+    Example set stanzas:
+    <iq type="get">
+      <query xmlns="http://jabber.org/protocol/disco#items">
+        <set xmlns="http://jabber.org/protocol/rsm">
+          <max>2</max>
+        </set>
+      </query>
+    </iq>
+
+    <iq type="result">
+      <query xmlns="http://jabber.org/protocol/disco#items">
+        <item jid="conference.example.com" />
+        <item jid="pubsub.example.com" />
+        <set xmlns="http://jabber.org/protocol/rsm">
+          <first>conference.example.com</first>
+          <last>pubsub.example.com</last>
+        </set>
+      </query>
+    </iq>
+
+    Stanza Interface:
+        first_index -- The index attribute of <first>
+        after       -- The id defining from which item to start
+        before      -- The id defining from which item to
+                       start when browsing backwards
+        max         -- Max amount per response
+        first       -- Id for the first item in the response
+        last        -- Id for the last item in the response
+        index       -- Used to set an index to start from
+        count       -- The number of remote items available
+
+    Methods:
+        set_first_index -- Sets the index attribute for <first> and
+                           creates the element if it doesn't exist
+        get_first_index -- Returns the value of the index
+                           attribute for <first>
+        del_first_index -- Removes the index attribute for <first>
+                           but keeps the element
+        set_before      -- Sets the value of <before>, if the value is True
+                           then the element will be created without a value
+        get_before      -- Returns the value of <before>, if it is
+                           empty it will return True
+
+    """
+    namespace = 'http://jabber.org/protocol/rsm'
+    name = 'set'
+    plugin_attrib = 'rsm'
+    sub_interfaces = set(('first', 'after', 'before', 'count',
+                          'index', 'last', 'max'))
+    interfaces = set(('first_index', 'first', 'after', 'before',
+                      'count', 'index', 'last', 'max'))
+
+    def set_first_index(self, val):
+        fi = self.find("{%s}first" % (self.namespace))
+        if fi is not None:
+            if val:
+                fi.attrib['index'] = val
+            else:
+                del fi.attrib['index']
+        elif val:
+            fi = ET.Element("{%s}first" % (self.namespace))
+            fi.attrib['index'] = val
+            self.xml.append(fi)
+
+    def get_first_index(self):
+        fi = self.find("{%s}first" % (self.namespace))
+        if fi is not None:
+            return fi.attrib.get('index', '')
+
+    def del_first_index(self):
+        fi = self.xml.find("{%s}first" % (self.namespace))
+        if fi is not None:
+            del fi.attrib['index']
+
+    def set_before(self, val):
+        b = self.xml.find("{%s}before" % (self.namespace))
+        if b is None and val == True:
+            self._set_sub_text('{%s}before' % self.namespace, '', True)
+        else:
+            self._set_sub_text('{%s}before' % self.namespace, val)
+
+    def get_before(self):
+        b = self.xml.find("{%s}before" % (self.namespace))
+        if b is not None and not b.text:
+            return True
+        elif b is not None:
+            return b.text
+        else:
+            return None