First pass at a new XEP-0030 plugin.

Now with dynamic node handling goodness.

Some things are not quite working yet, in particular:
    set_items
    set_info
    set_identities
    set_features

And still need more unit tests to round things out.

7 files changed, 863 insertions, 0 deletions

diff --git a/sleekxmpp/plugins/xep_0030/__init__.py b/sleekxmpp/plugins/xep_0030/__init__.py
new file mode 100644
index 00000000..2e183852
--- /dev/null
+++ b/sleekxmpp/plugins/xep_0030/__init__.py
@@ -0,0 +1,12 @@
+"""
+    SleekXMPP: The Sleek XMPP Library
+    Copyright (C) 2010 Nathanael C. Fritz, Lance J.T. Stout
+    This file is part of SleekXMPP.
+
+    See the file LICENSE for copying permission.
+"""
+
+from sleekxmpp.plugins.xep_0030 import stanza
+from sleekxmpp.plugins.xep_0030.stanza import DiscoInfo, DiscoItems
+from sleekxmpp.plugins.xep_0030.static import StaticDisco
+from sleekxmpp.plugins.xep_0030.disco import xep_0030
diff --git a/sleekxmpp/plugins/xep_0030/disco.py b/sleekxmpp/plugins/xep_0030/disco.py
new file mode 100644
index 00000000..c323ba7c
--- /dev/null
+++ b/sleekxmpp/plugins/xep_0030/disco.py
@@ -0,0 +1,314 @@
+"""
+    SleekXMPP: The Sleek XMPP Library
+    Copyright (C) 2010 Nathanael C. Fritz, Lance J.T. Stout
+    This file is part of SleekXMPP.
+
+    See the file LICENSE for copying permission.
+"""
+
+import logging
+
+import sleekxmpp
+from sleekxmpp import Iq
+from sleekxmpp.exceptions import XMPPError
+from sleekxmpp.plugins.base import base_plugin
+from sleekxmpp.xmlstream.handler import Callback
+from sleekxmpp.xmlstream.matcher import StanzaPath
+from sleekxmpp.xmlstream import register_stanza_plugin, ElementBase, ET, JID
+from sleekxmpp.plugins.xep_0030 import DiscoInfo, DiscoItems, StaticDisco
+
+
+log = logging.getLogger(__name__)
+
+
+class xep_0030(base_plugin):
+
+    """
+    XEP-0030: Service Discovery
+
+    Stream Handlers:
+        Disco Info  --
+        Disco Items --
+
+    Events:
+        disco_info         --
+        disco_items        --
+        disco_info_query   --
+        disco_items_query  --
+
+    Methods:
+        set_node_handler --
+        del_node_handler --
+        add_identity     --
+        del_identity     --
+        add_feature      --
+        del_feature      --
+        add_item         --
+        del_item         --
+        get_info         --
+        get_items        --
+    """
+
+    def plugin_init(self):
+        self.xep = '0030'
+        self.description = 'Service Discovery'
+        self.stanza = sleekxmpp.plugins.xep_0030.stanza
+
+        self.xmpp.register_handler(
+                Callback('Disco Info',
+                         StanzaPath('iq/disco_info'),
+                         self._handle_disco_info))
+
+        self.xmpp.register_handler(
+                Callback('Disco Items',
+                         StanzaPath('iq/disco_items'),
+                         self._handle_disco_items))
+
+        register_stanza_plugin(Iq, DiscoInfo)
+        register_stanza_plugin(Iq, DiscoItems)
+
+        self.static = StaticDisco(self.xmpp)
+
+        self._disco_ops = ['get_info', 'set_identities', 'set_features',
+                           'del_info', 'get_items', 'set_items', 'del_items',
+                           'add_identity', 'del_identity', 'add_feature',
+                           'del_feature', 'add_item', 'del_item']
+        self.handlers = {}
+        for op in self._disco_ops:
+            self.handlers[op] = {'global': getattr(self.static, op),
+                                 'jid': {},
+                                 'node': {}}
+
+
+    def set_node_handler(self, htype, jid=None, node=None, handler=None):
+        """
+        Arguments:
+            htype
+            jid
+            node
+            handler
+        """
+        if htype not in self._disco_ops:
+            return
+        if jid is None and node is None:
+            self.handlers[htype]['global'] = handler
+        elif node is None:
+            self.handlers[htype]['jid'][jid] = handler
+        elif jid is None:
+            jid = self.xmpp.boundjid.full
+            self.handlers[htype]['node'][(jid, node)] = handler
+        else:
+            self.handlers[htype]['node'][(jid, node)] = handler
+
+    def del_node_handler(self, htype, jid, node):
+        """
+        Arguments:
+            htype
+            jid
+            node
+        """
+        self.set_node_handler(htype, jid, node, None)
+
+    def make_static(self, jid=None, node=None, handlers=None):
+        """
+        Change all of a node's handlers to the default static
+        handlers. Useful for manually overriding the contents
+        of a node that would otherwise be handled by a JID level
+        or global level dynamic handler.
+
+        Arguments:
+            jid      -- The JID owning the node to modify.
+            node     -- The node to change to using static handlers.
+            handlers -- Optional list of handlers to change to the
+                        static version. If provided, only these
+                        handlers will be changed. Otherwise, all
+                        handlers will use the static version.
+        """
+        if handlers is None:
+            handlers = self._disco_ops
+        for op in handlers:
+            self.del_node_handler(op, jid, node)
+            self.set_node_handler(op, jid, node, getattr(self.static, op))
+
+    def get_info(self, jid=None, node=None, local=False, **kwargs):
+        """
+        Arguments:
+            jid      --
+            node     --
+            local    --
+            dfrom    --
+            block    --
+            timeout  --
+            callback --
+        """
+        if local or jid is None:
+            log.debug("Looking up local disco#info data " + \
+                      "for %s, node %s." % (jid, node))
+            info = self._run_node_handler('get_info', jid, node, kwargs)
+            return self._fix_default_info(info)
+
+        iq = self.xmpp.Iq()
+        iq['from'] = kwargs.get('dfrom', '')
+        iq['to'] = jid
+        iq['type'] = 'get'
+        iq['disco_info']['node'] = node if node else ''
+        return iq.send(timeout=kwargs.get('timeout', None),
+                       block=kwargs.get('block', None),
+                       callback=kwargs.get('callback', None))
+
+    def get_items(self, jid=None, node=None, local=False, **kwargs):
+        """
+        Arguments:
+            jid      --
+            node     --
+            local    --
+            dfrom    --
+            block    --
+            timeout  --
+            callback --
+        """
+        if local or jid is None:
+            return self._run_node_handler('get_items', jid, node, kwargs)
+
+        iq = self.xmpp.Iq()
+        iq['from'] = kwargs.get('dfrom', '')
+        iq['to'] = jid
+        iq['type'] = 'get'
+        iq['disco_items']['node'] = node if node else ''
+        return iq.send(timeout=kwargs.get('timeout', None),
+                       block=kwargs.get('block', None),
+                       callback=kwargs.get('callback', None))
+
+    def set_info(self, jid=None, node=None, **kwargs):
+        self._run_node_handler('set_info', jid, node, kwargs)
+
+    def del_info(self, jid=None, node=None, **kwargs):
+        self._run_node_handler('del_info', jid, node, kwargs)
+
+    def set_items(self, jid=None, node=None, **kwargs):
+        self._run_node_handler('set_items', jid, node, kwargs)
+
+    def del_items(self, jid=None, node=None, **kwargs):
+        self._run_node_handler('del_items', jid, node, kwargs)
+
+    def add_identity(self, jid=None, node=None, **kwargs):
+        self._run_node_handler('add_identity', jid, node, kwargs)
+
+    def add_feature(self, jid=None, node=None, **kwargs):
+        self._run_node_handler('add_feature', jid, node, kwargs)
+
+    def del_identity(self, jid=None, node=None, **kwargs):
+        self._run_node_handler('del_identity', jid, node, kwargs)
+
+    def del_feature(self, jid=None, node=None, **kwargs):
+        self._run_node_handler('del_feature', jid, node, kwargs)
+
+    def add_item(self, jid=None, node=None, **kwargs):
+        self._run_node_handler('add_item', jid, node, kwargs)
+
+    def del_item(self, jid=None, node=None, **kwargs):
+        self._run_node_handler('del_item', jid, node, kwargs)
+
+    def _run_node_handler(self, htype, jid, node, data=None):
+        """
+        Execute the most specific node handler for the given
+        JID/node combination.
+
+        Arguments:
+            htype -- The handler type to execute.
+            jid   -- The JID requested.
+            node  -- The node requested.
+            dat   -- Optional, custom data to pass to the handler.
+        """
+        if jid is None:
+            jid = self.xmpp.boundjid.full
+        if node is None:
+            node = ''
+
+        if self.handlers[htype]['node'].get((jid, node), False):
+            return self.handlers[htype]['node'][(jid, node)](jid, node, data)
+        elif self.handlers[htype]['jid'].get(jid, False):
+            return self.handlers[htype]['jid'][jid](jid, node, data)
+        elif self.handlers[htype]['global']:
+            return self.handlers[htype]['global'](jid, node, data)
+        else:
+            return None
+
+    def _handle_disco_info(self, iq):
+        """
+        Process an incoming disco#info stanza. If it is a get
+        request, find and return the appropriate identities
+        and features. If it is an info result, fire the
+        disco_info event.
+
+        Arguments:
+            iq -- The incoming disco#items stanza.
+        """
+        if iq['type'] == 'get':
+            log.debug("Received disco info query from " + \
+                      "<%s> to <%s>." % (iq['from'], iq['to']))
+            info = self._run_node_handler('get_info',
+                                          iq['to'].full,
+                                          iq['disco_info']['node'],
+                                          iq)
+            iq.reply()
+            if info:
+                info = self._fix_default_info(info)
+                iq.set_payload(info.xml)
+            iq.send()
+        elif iq['type'] == 'result':
+            log.debug("Received disco info result from" + \
+                      "%s to %s." % (iq['from'], iq['to']))
+            self.xmpp.event('disco_info', iq)
+
+    def _handle_disco_items(self, iq):
+        """
+        Process an incoming disco#items stanza. If it is a get
+        request, find and return the appropriate items. If it
+        is an items result, fire the disco_items event.
+
+        Arguments:
+            iq -- The incoming disco#items stanza.
+        """
+        if iq['type'] == 'get':
+            log.debug("Received disco items query from " + \
+                      "<%s> to <%s>." % (iq['from'], iq['to']))
+            items = self._run_node_handler('get_items',
+                                          iq['to'].full,
+                                          iq['disco_items']['node'])
+            iq.reply()
+            if items:
+                iq.set_payload(items.xml)
+            iq.send()
+        elif iq['type'] == 'result':
+            log.debug("Received disco items result from" + \
+                      "%s to %s." % (iq['from'], iq['to']))
+            self.xmpp.event('disco_items', iq)
+
+    def _fix_default_info(self, info):
+        """
+        Disco#info results for a JID are required to include at least
+        one identity and feature. As a default, if no other identity is
+        provided, SleekXMPP will use either the generic component or the
+        bot client identity. A the standard disco#info feature will also be
+        added if no features are provided.
+
+        Arguments:
+            info -- The disco#info quest (not the full Iq stanza) to modify.
+        """
+        if not info['node']:
+            if not info['identities']:
+                if self.xmpp.is_component:
+                    log.debug("No identity found for this entity." + \
+                              "Using default component identity.")
+                    info.add_identity('component', 'generic')
+                else:
+                    log.debug("No identity found for this entity." + \
+                              "Using default client identity.")
+                    info.add_identity('client', 'bot')
+            if not info['features']:
+                log.debug("No features found for this entity." + \
+                          "Using default disco#info feature.")
+                info.add_feature(info.namespace)
+        return info
+
diff --git a/sleekxmpp/plugins/xep_0030/stanza/__init__.py b/sleekxmpp/plugins/xep_0030/stanza/__init__.py
new file mode 100644
index 00000000..0d97cf3d
--- /dev/null
+++ b/sleekxmpp/plugins/xep_0030/stanza/__init__.py
@@ -0,0 +1,10 @@
+"""
+    SleekXMPP: The Sleek XMPP Library
+    Copyright (C) 2010 Nathanael C. Fritz, Lance J.T. Stout
+    This file is part of SleekXMPP.
+
+    See the file LICENSE for copying permission.
+"""
+
+from sleekxmpp.plugins.xep_0030.stanza.info import DiscoInfo
+from sleekxmpp.plugins.xep_0030.stanza.items import DiscoItems
diff --git a/sleekxmpp/plugins/xep_0030/stanza/disco.py b/sleekxmpp/plugins/xep_0030/stanza/disco.py
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/sleekxmpp/plugins/xep_0030/stanza/disco.py
diff --git a/sleekxmpp/plugins/xep_0030/stanza/info.py b/sleekxmpp/plugins/xep_0030/stanza/info.py
new file mode 100644
index 00000000..6764acbb
--- /dev/null
+++ b/sleekxmpp/plugins/xep_0030/stanza/info.py
@@ -0,0 +1,262 @@
+"""
+    SleekXMPP: The Sleek XMPP Library
+    Copyright (C) 2010 Nathanael C. Fritz, Lance J.T. Stout
+    This file is part of SleekXMPP.
+
+    See the file LICENSE for copying permission.
+"""
+
+from sleekxmpp.xmlstream import ElementBase, ET
+
+
+class DiscoInfo(ElementBase):
+
+    """
+    XMPP allows for users and agents to find the identities and features
+    supported by other entities in the XMPP network through service discovery,
+    or "disco". In particular, the "disco#info" query type for <iq> stanzas is
+    used to request the list of identities and features offered by a JID.
+
+    An identity is a combination of a category and type, such as the 'client'
+    category with a type of 'pc' to indicate the agent is a human operated
+    client with a GUI, or a category of 'gateway' with a type of 'aim' to
+    identify the agent as a gateway for the legacy AIM protocol. See
+    <http://xmpp.org/registrar/disco-categories.html> for a full list of
+    accepted category and type combinations.
+
+    Features are simply a set of the namespaces that identify the supported
+    features. For example, a client that supports service discovery will
+    include the feature 'http://jabber.org/protocol/disco#info'.
+
+    Since clients and components may operate in several roles at once, identity
+    and feature information may be grouped into "nodes". If one were to write
+    all of the identities and features used by a client, then node names would
+    be like section headings.
+
+    Example disco#info stanzas:
+        <iq type="get">
+          <query xmlns="http://jabber.org/protocol/disco#info" />
+        </iq>
+
+        <iq type="result">
+          <query xmlns="http://jabber.org/protocol/disco#info">
+            <identity category="client" type="bot" name="SleekXMPP Bot" />
+            <feature var="http://jabber.org/protocol/disco#info" />
+            <feature var="jabber:x:data" />
+            <feature var="urn:xmpp:ping" />
+          </query>
+        </iq>
+
+    Stanza Interface:
+        node       -- The name of the node to either
+                      query or return info from.
+        identities -- A set of 4-tuples, where each tuple contains
+                      the category, type, xml:lang, and name
+                      of an identity.
+        features   -- A set of namespaces for features.
+
+    Methods:
+        add_identity   -- Add a new, single identity.
+        del_identity   -- Remove a single identity.
+        get_identities -- Return all identities in tuple form.
+        set_identities -- Use multiple identities, each given in tuple form.
+        del_identities -- Remove all identities.
+        add_feature    -- Add a single feature.
+        del_feature    -- Remove a single feature.
+        get_features   -- Return a list of all features.
+        set_features   -- Use a given list of features.
+        del_features   -- Remove all features.
+    """
+
+    name = 'query'
+    namespace = 'http://jabber.org/protocol/disco#info'
+    plugin_attrib = 'disco_info'
+    interfaces = set(('node', 'features', 'identities'))
+    lang_interfaces = set(('identities',))
+
+    # Cache identities and features
+    _identities = set()
+    _features = set()
+
+    def setup(self, xml=None):
+        """
+        Populate the stanza object using an optional XML object.
+
+        Overrides ElementBase.setup
+
+        Caches identity and feature information.
+
+        Arguments:
+            xml -- Use an existing XML object for the stanza's values.
+        """
+        ElementBase.setup(self, xml)
+
+        self._identities = set([id[0:3] for id in self['identities']])
+        self._features = self['features']
+
+    def add_identity(self, category, itype, name=None, lang=None):
+        """
+        Add a new identity element. Each identity must be unique
+        in terms of all four identity components.
+
+        Multiple, identical category/type pairs are allowed only
+        if the xml:lang values are different. Likewise, multiple
+        category/type/xml:lang pairs are allowed so long as the names
+        are different. In any case, a category and type are required.
+
+        Arguments:
+            category -- The general category to which the agent belongs.
+            itype    -- A more specific designation with the category.
+            name     -- Optional human readable name for this identity.
+            lang     -- Optional standard xml:lang value.
+        """
+        identity = (category, itype, lang)
+        if identity not in self._identities:
+            self._identities.add(identity)
+            id_xml = ET.Element('{%s}identity' % self.namespace)
+            id_xml.attrib['category'] = category
+            id_xml.attrib['type'] = itype
+            if lang:
+                id_xml.attrib['{%s}lang' % self.xml_ns] = lang
+            if name:
+                id_xml.attrib['name'] = name
+            self.xml.append(id_xml)
+            return True
+        return False
+
+    def del_identity(self, category, itype, name=None, lang=None):
+        """
+        Remove a given identity.
+
+        Arguments:
+            category -- The general category to which the agent belonged.
+            itype    -- A more specific designation with the category.
+            name     -- Optional human readable name for this identity.
+            lang     -- Optional, standard xml:lang value.
+        """
+        identity = (category, itype, lang)
+        if identity in self._identities:
+            self._identities.remove(identity)
+            for id_xml in self.findall('{%s}identity' % self.namespace):
+                id = (id_xml.attrib['category'],
+                      id_xml.attrib['type'],
+                      id_xml.attrib.get('{%s}lang' % self.xml_ns, None))
+                if id == identity:
+                    self.xml.remove(id_xml)
+                    return True
+        return False
+
+    def get_identities(self, lang=None):
+        """
+        Return a set of all identities in tuple form as so:
+            (category, type, lang, name)
+
+        If a language was specified, only return identities using
+        that language.
+
+        Arguments:
+            lang -- Optional, standard xml:lang value.
+        """
+        identities = set()
+        for id_xml in self.findall('{%s}identity' % self.namespace):
+            xml_lang = id_xml.attrib.get('{%s}lang' % self.xml_ns, None)
+            if lang is None or xml_lang == lang:
+                identities.add((
+                    id_xml.attrib['category'],
+                    id_xml.attrib['type'],
+                    id_xml.attrib.get('{%s}lang' % self.xml_ns, None),
+                    id_xml.attrib.get('name', None)))
+        return identities
+
+    def set_identities(self, identities, lang=None):
+        """
+        Add or replace all identities. The identities must be a in set
+        where each identity is a tuple of the form:
+            (category, type, lang, name)
+
+        If a language is specifified, any identities using that language
+        will be removed to be replaced with the given identities.
+
+        NOTE: An identity's language will not be changed regardless of
+              the value of lang.
+
+        Arguments:
+            identities -- A set of identities in tuple form.
+            lang       -- Optional, standard xml:lang value.
+        """
+        self.del_identities(lang)
+        for identity in identities:
+            category, itype, lang, name = identity
+            self.add_identity(category, itype, name, lang)
+
+    def del_identities(self, lang=None):
+        """
+        Remove all identities. If a language was specified, only
+        remove identities using that language.
+
+        Arguments:
+            lang -- Optional, standard xml:lang value.
+        """
+        for id_xml in self.findall('{%s}identity' % self.namespace):
+            if lang is None:
+                self.xml.remove(id_xml)
+            elif id_xml.attrib.get('{%s}lang' % self.xml_ns, None) == lang:
+                self._identities.remove((
+                    id_xml.attrib['category'],
+                    id_xml.attrib['type'],
+                    id_xml.attrib.get('{%s}lang' % self.xml_ns, None)))
+                self.xml.remove(id_xml)
+
+    def add_feature(self, feature):
+        """
+        Add a single, new feature.
+
+        Arguments:
+            feature -- The namespace of the supported feature.
+        """
+        if feature not in self._features:
+            self._features.add(feature)
+            feature_xml = ET.Element('{%s}feature' % self.namespace)
+            feature_xml.attrib['var'] = feature
+            self.xml.append(feature_xml)
+            return True
+        return False
+
+    def del_feature(self, feature):
+        """
+        Remove a single feature.
+
+        Arguments:
+            feature -- The namespace of the removed feature.
+        """
+        if feature in self._features:
+            self._features.remove(feature)
+            for feature_xml in self.findall('{%s}feature' % self.namespace):
+                if feature_xml.attrib['var'] == feature:
+                    self.xml.remove(feature_xml)
+                    return True
+        return False
+
+    def get_features(self):
+        """Return the set of all supported features."""
+        features = set()
+        for feature_xml in self.findall('{%s}feature' % self.namespace):
+            features.add(feature_xml.attrib['var'])
+        return features
+
+    def set_features(self, features):
+        """
+        Add or replace the set of supported features.
+
+        Arguments:
+            features -- The new set of supported features.
+        """
+        self.del_features()
+        for feature in features:
+            self.add_feature(feature)
+
+    def del_features(self):
+        """Remove all features."""
+        self._features = set()
+        for feature_xml in self.findall('{%s}feature' % self.namespace):
+            self.xml.remove(feature_xml)
diff --git a/sleekxmpp/plugins/xep_0030/stanza/items.py b/sleekxmpp/plugins/xep_0030/stanza/items.py
new file mode 100644
index 00000000..319e666f
--- /dev/null
+++ b/sleekxmpp/plugins/xep_0030/stanza/items.py
@@ -0,0 +1,138 @@
+"""
+    SleekXMPP: The Sleek XMPP Library
+    Copyright (C) 2010 Nathanael C. Fritz, Lance J.T. Stout
+    This file is part of SleekXMPP.
+
+    See the file LICENSE for copying permission.
+"""
+
+from sleekxmpp.xmlstream import ElementBase, ET
+
+
+class DiscoItems(ElementBase):
+
+    """
+             
+
+    Example disco#items stanzas:
+        <iq type="get">
+          <query xmlns="http://jabber.org/protocol/disco#items" />
+        </iq>
+
+        <iq type="result">
+          <query xmlns="http://jabber.org/protocol/disco#items">
+            <item jid="chat.example.com"
+                  node="xmppdev"
+                  name="XMPP Dev" />
+            <item jid="chat.example.com"
+                  node="sleekdev"
+                  name="SleekXMPP Dev" />
+          </query>
+        </iq>
+
+    Stanza Interface:
+        node  -- The name of the node to either
+                 query or return info from.
+        items -- A list of 3-tuples, where each tuple contains
+                 the JID, node, and name of an item.
+
+    Methods:
+        add_item  -- Add a single new item.
+        del_item  -- Remove a single item.
+        get_items -- Return all items.
+        set_items -- Set or replace all items.
+        del_items -- Remove all items.
+    """
+
+    name = 'query'
+    namespace = 'http://jabber.org/protocol/disco#items'
+    plugin_attrib = 'disco_items'
+    interfaces = set(('node', 'items'))
+
+    # Cache items
+    _items = set()
+
+    def setup(self, xml=None):
+        """
+        Populate the stanza object using an optional XML object.
+
+        Overrides ElementBase.setup
+
+        Caches item information.
+
+        Arguments:
+            xml -- Use an existing XML object for the stanza's values.
+        """
+        ElementBase.setup(self, xml)
+        self._items = set([item[0:2] for item in self['items']])
+
+    def add_item(self, jid, node=None, name=None):
+        """
+        Add a new item element. Each item is required to have a
+        JID, but may also specify a node value to reference
+        non-addressable entitities.
+
+        Arguments:
+            jid  -- The JID for the item.
+            node -- Optional additional information to reference 
+                    non-addressable items.
+            name -- Optional human readable name for the item.
+        """
+        if (jid, node) not in self._items:
+            self._items.add((jid, node))
+            item_xml = ET.Element('{%s}item' % self.namespace)
+            item_xml.attrib['jid'] = jid
+            if name:
+                item_xml.attrib['name'] = name
+            if node:
+                item_xml.attrib['node'] = node
+            self.xml.append(item_xml)
+            return True
+        return False
+
+    def del_item(self, jid, node=None):
+        """
+        Remove a single item.
+
+        Arguments:
+            jid  -- JID of the item to remove.
+            node -- Optional extra identifying information.
+        """
+        if (jid, node) in self._items:
+            for item_xml in self.findall('{%s}item' % self.namespace):
+                item = (item_xml.attrib['jid'],
+                        item_xml.attrib.get('node', None))
+                if item == (jid, node):
+                    self.xml.remove(item_xml)
+                    return True
+        return False
+
+    def get_items(self):
+        """Return all items."""
+        items = set()
+        for item_xml in self.findall('{%s}item' % self.namespace):
+            item = (item_xml.attrib['jid'],
+                    item_xml.attrib.get('node'),
+                    item_xml.attrib.get('name'))
+            items.add(item)
+        return items
+
+    def set_items(self, items):
+        """
+        Set or replace all items. The given items must be in a
+        list or set where each item is a tuple of the form:
+            (jid, node, name)
+
+        Arguments:
+            items -- A series of items in tuple format.
+        """
+        self.del_items()
+        for item in items:
+            jid, node, name = item
+            self.add_item(jid, node, name)
+
+    def del_items(self):
+        """Remove all items."""
+        self._items = set()
+        for item_xml in self.findall('{%s}item' % self.namespace):
+            self.xml.remove(item_xml)
diff --git a/sleekxmpp/plugins/xep_0030/static.py b/sleekxmpp/plugins/xep_0030/static.py
new file mode 100644
index 00000000..f3693228
--- /dev/null
+++ b/sleekxmpp/plugins/xep_0030/static.py
@@ -0,0 +1,127 @@
+"""
+    SleekXMPP: The Sleek XMPP Library
+    Copyright (C) 2010 Nathanael C. Fritz, Lance J.T. Stout
+    This file is part of SleekXMPP.
+
+    See the file LICENSE for copying permission.
+"""
+
+import logging
+
+import sleekxmpp
+from sleekxmpp import Iq
+from sleekxmpp.exceptions import XMPPError
+from sleekxmpp.plugins.base import base_plugin
+from sleekxmpp.xmlstream.handler import Callback
+from sleekxmpp.xmlstream.matcher import StanzaPath
+from sleekxmpp.xmlstream import register_stanza_plugin, ElementBase, ET, JID
+from sleekxmpp.plugins.xep_0030 import DiscoInfo, DiscoItems
+
+
+log = logging.getLogger(__name__)
+
+
+class StaticDisco(object):
+
+    """
+    While components will likely require fully dynamic handling
+    of service discovery information, most clients and simple bots
+    only need to manage a few disco nodes that will remain mostly
+    static.
+
+    StaticDisco provides a set of node handlers that will store
+    static sets of disco info and items in memory.
+    """
+
+    def __init__(self, xmpp):
+        """
+        Arguments:
+            xmpp -- The main SleekXMPP object.
+        """
+        self.nodes = {}
+        self.xmpp = xmpp
+
+    def add_node(self, jid=None, node=None):
+        if jid is None:
+            jid = self.xmpp.boundjid.full
+        if node is None:
+            node = ''
+        if (jid, node) not in self.nodes:
+            self.nodes[(jid, node)] = {'info': DiscoInfo(),
+                                       'items': DiscoItems()}
+            self.nodes[(jid, node)]['info']['node'] = node
+            self.nodes[(jid, node)]['items']['node'] = node
+
+    def get_info(self, jid, node, data=None):
+        if (jid, node) not in self.nodes:
+            if not node:
+                return DiscoInfo()
+            else:
+                raise XMPPError(condition='item-not-found')
+        else:
+            return self.nodes[(jid, node)]['info']
+
+    def del_info(self, jid, node, data=None):
+        if (jid, node) in self.nodes:
+            self.nodes[(jid, node)]['info'] = DiscoInfo()
+
+    def get_items(self, jid, node, data=None):
+        if (jid, node) not in self.nodes:
+            if not node:
+                return DiscoInfo()
+            else:
+                raise XMPPError(condition='item-not-found')
+        else:
+            return self.nodes[(jid, node)]['items']
+
+    def set_items(self, jid, node, data=None):
+        pass
+
+    def del_items(self, jid, node, data=None):
+        if (jid, node) in self.nodes:
+            self.nodes[(jid, node)]['items'] = DiscoItems()
+
+    def add_identity(self, jid, node, data={}):
+        self.add_node(jid, node)
+        self.nodes[(jid, node)]['info'].add_identity(
+                data.get('category', ''),
+                data.get('itype', ''),
+                data.get('name', None),
+                data.get('lang', None))
+
+    def set_identities(self, jid, node, data=None):
+        pass
+
+    def del_identity(self, jid, node, data=None):
+        if (jid, node) not in self.nodes:
+            return
+        self.nodes[(jid, node)]['info'].del_identity(
+                data.get('category', ''),
+                data.get('itype', ''),
+                data.get('name', None),
+                data.get('lang', None))
+
+
+    def add_feature(self, jid, node, data=None):
+        self.add_node(jid, node)
+        self.nodes[(jid, node)]['info'].add_feature(data.get('feature', ''))
+
+    def set_features(self, jid, node, data=None):
+        pass
+
+    def del_feature(self, jid, node, data=None):
+        if (jid, node) not in self.nodes:
+            return
+        self.nodes[(jid, node)]['info'].del_feature(data.get('feature', ''))
+
+    def add_item(self, jid, node, data=None):
+        self.add_node(jid, node)
+        self.nodes[(jid, node)]['items'].add_item(
+                data.get('ijid', ''),
+                node=data.get('inode', None),
+                name=data.get('name', None))
+
+    def del_item(self, jid, node, data=None):
+        if (jid, node) in self.nodes:
+            self.nodes[(jid, node)]['items'].del_item(**data)
+