Merge branch 'gateway' into 'master'

Gateway interaction (XEP0100)

See merge request poezio/slixmpp!135

5 files changed, 689 insertions, 0 deletions

diff --git a/docs/api/plugins/xep_0100.rst b/docs/api/plugins/xep_0100.rst
new file mode 100644
index 00000000..15c99ed1
--- /dev/null
+++ b/docs/api/plugins/xep_0100.rst
@@ -0,0 +1,9 @@
+
+XEP-0106: Gateway interaction
+=============================
+
+.. module:: slixmpp.plugins.xep_0100
+
+.. autoclass:: XEP_0100
+    :members:
+    :exclude-members: session_bind, plugin_init, plugin_end
diff --git a/slixmpp/plugins/__init__.py b/slixmpp/plugins/__init__.py
index 70ec55d2..d087f92b 100644
--- a/slixmpp/plugins/__init__.py
+++ b/slixmpp/plugins/__init__.py
@@ -42,6 +42,7 @@ __all__ = [
     'xep_0092',  # Software Version
 #   'xep_0095',  # Legacy Stream Initiation. Don’t automatically load
 #   'xep_0096',  # Legacy SI File Transfer. Don’t automatically load
+    'xep_0100',  # Gateway interaction
     'xep_0106',  # JID Escaping
     'xep_0107',  # User Mood
     'xep_0108',  # User Activity
diff --git a/slixmpp/plugins/xep_0100/__init__.py b/slixmpp/plugins/xep_0100/__init__.py
new file mode 100644
index 00000000..101b8db0
--- /dev/null
+++ b/slixmpp/plugins/xep_0100/__init__.py
@@ -0,0 +1,6 @@
+from slixmpp.plugins.base import register_plugin
+
+from slixmpp.plugins.xep_0100.gateway import XEP_0100, LegacyError
+
+
+register_plugin(XEP_0100)
diff --git a/slixmpp/plugins/xep_0100/gateway.py b/slixmpp/plugins/xep_0100/gateway.py
new file mode 100644
index 00000000..8ff102bb
--- /dev/null
+++ b/slixmpp/plugins/xep_0100/gateway.py
@@ -0,0 +1,257 @@
+import asyncio
+import logging
+from functools import partial
+import typing
+
+from slixmpp import Message, Iq, Presence, JID
+from slixmpp.xmlstream.handler import Callback
+from slixmpp.xmlstream.matcher import StanzaPath
+from slixmpp.plugins import BasePlugin
+
+
+class XEP_0100(BasePlugin):
+
+    """
+    XEP-0100: Gateway interaction
+
+    Does not cover the deprecated Agent Information and 'jabber:iq:gateway' protocols
+
+    Events registered by this plugin:
+
+    - legacy_login: Jabber user got online or just registered
+    - legacy_logout: Jabber user got offline or just unregistered
+    - legacy_presence_unavailable: Jabber user sent an unavailable presence to a legacy contact
+    - gateway_message: Jabber user sent a direct message to the gateway component
+    - legacy_message: Jabber user sent a message to the legacy network
+
+
+    Plugin Parameters:
+
+    - `component_name`: (str) Name of the entity
+    - `type`: (str) Type of the gateway identity. Should be the name of the legacy service
+    - `needs_registration`: (bool) If set to True, messages received from unregistered users will
+      not be transmitted to the legacy service
+
+    API:
+
+    - legacy_contact_add(jid, node, ifrom: JID, args: JID): Add contact on the legacy service.
+      Should raise LegacyError if anything goes wrong in the process.
+      `ifrom` is the gateway user's JID and `args` is the legacy contact's JID.
+    - legacy_contact_remove(jid, node, ifrom: JID, args: JID): Remove a contact.
+
+    """
+
+    name = "xep_0100"
+    description = "XEP-0100: Gateway interaction"
+    dependencies = {
+        "xep_0030",  # Service discovery
+        "xep_0077",  # In band registration
+    }
+
+    default_config = {
+        "component_name": "SliXMPP gateway",
+        "type": "xmpp",
+        "needs_registration": True,
+    }
+
+    def plugin_init(self):
+        if not self.xmpp.is_component:
+            log.error("Only components can be gateways, aborting plugin load")
+            return
+
+        self.xmpp["xep_0030"].add_identity(
+            name=self.component_name, category="gateway", itype=self.type
+        )
+
+        self.api.register(self._legacy_contact_remove, "legacy_contact_remove")
+        self.api.register(self._legacy_contact_add, "legacy_contact_add")
+
+        # Without that BaseXMPP sends unsub/unavailable on sub requests and we don't want that
+        self.xmpp.client_roster.auto_authorize = True
+        self.xmpp.client_roster.auto_subscribe = False
+
+        self.xmpp.add_event_handler("user_register", self.on_user_register)
+        self.xmpp.add_event_handler("user_unregister", self.on_user_unregister)
+        self.xmpp.add_event_handler("presence_available", self.on_presence_available)
+        self.xmpp.add_event_handler(
+            "presence_unavailable", self.on_presence_unavailable
+        )
+        self.xmpp.add_event_handler("presence_subscribe", self.on_presence_subscribe)
+        self.xmpp.add_event_handler(
+            "presence_unsubscribe", self.on_presence_unsubscribe
+        )
+        self.xmpp.add_event_handler("message", self.on_message)
+
+    def plugin_end(self):
+        if not self.xmpp.is_component:
+            return
+
+        self.xmpp.del_event_handler("user_register", self.on_user_register)
+        self.xmpp.del_event_handler("user_unregister", self.on_user_unregister)
+        self.xmpp.del_event_handler("presence_available", self.on_presence_available)
+        self.xmpp.del_event_handler(
+            "presence_unavailable", self.on_presence_unavailable
+        )
+        self.xmpp.del_event_handler("presence_subscribe", self.on_presence_subscribe)
+        self.xmpp.del_event_handler("message", self.on_message)
+        self.xmpp.del_event_handler(
+            "presence_unsubscribe", self.on_presence_unsubscribe
+        )
+
+    async def get_user(self, stanza):
+        return await self.xmpp["xep_0077"].api["user_get"](None, None, None, stanza)
+
+    def send_presence(self, pto, ptype=None, pstatus=None, pfrom=None):
+        self.xmpp.send_presence(
+            pfrom=self.xmpp.boundjid.bare,
+            ptype=ptype,
+            pto=pto,
+            pstatus=pstatus,
+        )
+
+    async def on_user_register(self, iq: Iq):
+        user_jid = iq["from"]
+        user = await self.get_user(iq)
+        if user is None:  # This should not happen
+            log.warning(f"{user_jid} has registered but cannot find them in user store")
+        else:
+            log.debug(f"Sending subscription request to {user_jid}")
+            self.xmpp.client_roster.subscribe(user_jid)
+
+    def on_user_unregister(self, iq: Iq):
+        user_jid = iq["from"]
+        log.debug(f"Sending subscription request to {user_jid}")
+        self.xmpp.event("legacy_logout", iq)
+        self.xmpp.client_roster.unsubscribe(iq["from"])
+        self.xmpp.client_roster.remove(iq["from"])
+        log.debug(f"roster: {self.xmpp.client_roster}")
+
+    async def on_presence_available(self, presence: Presence):
+        user_jid = presence["from"]
+        user = await self.get_user(presence)
+        if user is None:
+            log.warning(
+                f"{user_jid} has gotten online but cannot find them in user store"
+            )
+        else:
+            self.xmpp.event("legacy_login", presence)
+            log.debug(f"roster: {self.xmpp.client_roster}")
+            self.send_presence(pto=user_jid.bare, ptype="available")
+
+    async def on_presence_unavailable(self, presence: Presence):
+        user_jid = presence["from"]
+        user = await self.get_user(presence)
+        if user is None:  # This should not happen
+            log.warning(
+                f"{user_jid} has gotten offline but but cannot find them in user store"
+            )
+            return
+
+        if presence["to"] == self.xmpp.boundjid.bare:
+            self.xmpp.event("legacy_logout", presence)
+            self.send_presence(pto=user_jid, ptype="unavailable")
+        else:
+            self.xmpp.event("legacy_presence_unavailable", presence)
+
+    async def _legacy_contact_add(self, jid, node, ifrom, contact_jid: JID):
+        pass
+
+    async def on_presence_subscribe(self, presence: Presence):
+        user_jid = presence["from"]
+        user = await self.get_user(presence)
+        if user is None and self.needs_registration:
+            return
+
+        if presence["to"] == self.xmpp.boundjid.bare:
+            return
+
+        try:
+            await self.api["legacy_contact_add"](
+                ifrom=user_jid,
+                args=presence["to"],
+            )
+        except LegacyError:
+            self.xmpp.send_presence(
+                pfrom=presence["to"],
+                ptype="unsubscribed",
+                pto=user_jid,
+            )
+            return
+        self.xmpp.send_presence(
+            pfrom=presence["to"],
+            ptype="subscribed",
+            pto=user_jid,
+        )
+        self.xmpp.send_presence(
+            pfrom=presence["to"],
+            pto=user_jid,
+        )
+        self.xmpp.send_presence(
+            pfrom=presence["to"],
+            ptype="subscribe",
+            pto=user_jid,
+        )  # TODO: handle resulting subscribed presences
+
+    async def on_presence_unsubscribe(self, presence: Presence):
+        if presence["to"] == self.xmpp.boundjid.bare:
+            # should we trigger unregistering here?
+            return
+
+        user_jid = presence["from"]
+        user = await self.get_user(presence)
+        if user is None:
+            log.debug("Received remove subscription from unregistered user")
+            if self.needs_registration:
+                return
+
+        await self.api["legacy_contact_remove"](ifrom=user_jid, args=presence["to"])
+
+        for ptype in "unsubscribe", "unsubscribed", "unavailable":
+            self.xmpp.send_presence(
+                pfrom=presence["to"],
+                ptype=ptype,
+                pto=user_jid,
+            )
+
+    async def _legacy_contact_remove(self, jid, node, ifrom, contact_jid: JID):
+        pass
+
+    async def on_message(self, msg: Message):
+        if msg["type"] == "groupchat":
+            return  # groupchat messages are out of scope of XEP-0100
+
+        if msg["to"] == self.xmpp.boundjid.bare:
+            # It may be useful to exchange direct messages with the component
+            self.xmpp.event("gateway_message", msg)
+            return
+
+        if self.needs_registration and await self.get_user(msg) is None:
+            return
+
+        self.xmpp.event("legacy_message", msg)
+
+    def transform_legacy_message(
+        self,
+        jabber_user_jid: typing.Union[JID, str],
+        legacy_contact_id: str,
+        body: str,
+        mtype: typing.Optional[str] = None,
+    ):
+        """
+        Transform a legacy message to an XMPP message
+        """
+        # Should escaping legacy IDs to valid JID local parts be handled here?
+        # Maybe by internal API stuff?
+        self.xmpp.send_message(
+            mfrom=JID(f"{legacy_contact_id}@{self.xmpp.boundjid.bare}"),
+            mto=JID(jabber_user_jid).bare,
+            mbody=body,
+            mtype=mtype,
+        )
+
+
+class LegacyError(Exception):
+    pass
+
+
+log = logging.getLogger(__name__)
diff --git a/tests/test_stream_xep_0100.py b/tests/test_stream_xep_0100.py
new file mode 100644
index 00000000..24e35f9e
--- /dev/null
+++ b/tests/test_stream_xep_0100.py
@@ -0,0 +1,416 @@
+import unittest
+import logging
+
+from slixmpp import JID
+from slixmpp.test import SlixTest
+
+from slixmpp.plugins import xep_0100
+from slixmpp.plugins.xep_0100 import LegacyError
+
+
+class TestStreamGateway(SlixTest):
+    def setUp(self):
+        self.stream_start(
+            mode="component",
+            plugins=["xep_0077", "xep_0100"],
+            jid="aim.shakespeare.lit",
+            server="shakespeare.lit",
+            plugin_config={
+                "xep_0100": {"component_name": "AIM Gateway", "type": "aim"}
+            },
+        )
+
+    def next_sent(self):
+        self.wait_for_send_queue()
+        sent = self.xmpp.socket.next_sent(timeout=0.5)
+        if sent is None:
+            return None
+        xml = self.parse_xml(sent)
+        self.fix_namespaces(xml, "jabber:component:accept")
+        sent = self.xmpp._build_stanza(xml, "jabber:component:accept")
+        return sent
+
+    def testDisco(self):
+        # https://xmpp.org/extensions/xep-0100.html#example-3
+        self.recv(
+            """
+            <iq type='get'
+                from='romeo@montague.lit/orchard'
+                to='aim.shakespeare.lit'
+                id='disco1'>
+            <query xmlns='http://jabber.org/protocol/disco#info'/>
+            </iq>
+            """
+        )
+        self.send(
+            """
+            <iq type="result"
+                from="aim.shakespeare.lit"
+                to="romeo@montague.lit/orchard"
+                id="disco1">
+            <query xmlns="http://jabber.org/protocol/disco#info">
+                <identity category="gateway" type="aim" name="AIM Gateway" />
+                <feature var="jabber:iq:register" />
+                <feature var="jabber:x:data" />
+                <feature var="jabber:iq:oob" />
+                <feature var="jabber:x:oob" />
+            </query>
+            </iq>
+            """
+        )
+
+    def testRegister(self):
+        event_result = {}
+
+        def legacy_login(iq):
+            event_result["user"] = iq["from"]
+
+        self.xmpp.add_event_handler("legacy_login", legacy_login)
+
+        # Jabber User sends IQ-set qualified by the 'jabber:iq:register' namespace to Gateway,
+        # containing information required to register.
+        # https://xmpp.org/extensions/xep-0100.html#example-7
+        self.recv(
+            """
+            <iq type='set'
+                from='romeo@montague.lit/orchard'
+                to='aim.shakespeare.lit'
+                id='reg2'>
+            <query xmlns='jabber:iq:register'>
+                <username>RomeoMyRomeo</username>
+                <password>ILoveJuliet</password>
+            </query>
+            </iq>
+            """
+        )
+        # Gateway verifies that registration information provided by Jabber User is valid
+        # (using whatever means appropriate for the Legacy Service) and informs Jabber User of success [A1].
+        # https://xmpp.org/extensions/xep-0100.html#example-8
+        self.send(
+            """
+            <iq type='result'
+                from='aim.shakespeare.lit'
+                to='romeo@montague.lit/orchard'
+                id='reg2'/>
+            """
+        )
+        # Gateway sends subscription request to Jabber User (i.e., by sending a presence stanza
+        # of type "subscribe" to Jabber User's bare JID).
+        # https://xmpp.org/extensions/xep-0100.html#example-11
+        sent = self.next_sent()
+        self.check(
+            sent, "/presence@type=subscribe@from=aim.shakespeare.lit", "stanzapath"
+        )
+        self.assertTrue(
+            sent["to"] == "romeo@montague.lit"
+        )  # cannot use stanzapath because of @
+        # Jabber User's client SHOULD approve the subscription request (i.e., by sending a presence stanza
+        # of type "subscribed" to Gateway).
+        self.recv(
+            """
+            <presence type='subscribed'
+                      from='romeo@montague.lit'
+                      to='aim.shakespeare.lit'/>
+            """
+        )
+        # Jabber User sends subscription request to Gateway (i.e., by sending a presence stanza
+        # of type "subscribe" to Gateway).
+        self.recv(
+            """
+            <presence type='subscribe'
+                      from='romeo@montague.lit'
+                      to='aim.shakespeare.lit'/>
+            """
+        )
+        # Gateway sends approves subscription request (i.e., by sending a presence stanza of type
+        # "subscribed" to Jabber User's bare JID).
+        sent = self.next_sent()
+        self.check(
+            sent, "/presence@type=subscribed@from=aim.shakespeare.lit", "stanzapath"
+        )
+        self.assertTrue(
+            sent["to"] == "romeo@montague.lit"
+        )  # cannot use stanzapath because of @
+        self.assertTrue(
+            self.xmpp.client_roster["romeo@montague.lit"]["subscription"] == "both"
+        )
+        self.recv(
+            """
+            <presence from='romeo@montague.lit/orchard'
+                      to='aim.shakespeare.lit'/>
+            """
+        )
+        self.assertTrue(event_result["user"] == "romeo@montague.lit/orchard")
+
+    def testBadCredentials(self):
+        def raise_v(*a, **kwa):
+            raise ValueError("Not good")
+
+        self.xmpp["xep_0077"].api.register(raise_v, "user_validate")
+        self.recv(
+            """
+            <iq type='set'
+                from='romeo@montague.lit/orchard'
+                to='aim.shakespeare.lit'
+                id='reg2'>
+            <query xmlns='jabber:iq:register'>
+                <username>RomeoMyRomeo</username>
+                <password>ILoveJuliet</password>
+            </query>
+            </iq>
+            """
+        )
+        # xmlns="jabber:client" in error substanza, bug in XEP-0077 plugin or OK?
+        self.send(
+            """
+            <iq type='error'
+                from='aim.shakespeare.lit'
+                to='romeo@montague.lit/orchard'
+                id='reg2'>
+            <query xmlns='jabber:iq:register'>
+                <username>RomeoMyRomeo</username>
+                <password>ILoveJuliet</password>
+            </query>
+            <error code='406' type='modify' xmlns="jabber:client">
+                <not-acceptable
+                    xmlns='urn:ietf:params:xml:ns:xmpp-stanzas'/>
+                <text xmlns="urn:ietf:params:xml:ns:xmpp-stanzas">Not good</text>
+            </error>
+            </iq>
+            """,
+            use_values=False,
+        )
+
+    def testLogin(self):
+        event_result = {}
+
+        def legacy_login(presence):
+            event_result["user"] = presence["from"]
+
+        self.xmpp.add_event_handler("legacy_login", legacy_login)
+
+        self.xmpp["xep_0077"].api["user_validate"](
+            None,
+            None,
+            JID("romeo@montague.lit"),
+            {"username": "RomeoMyRomeo", "password": "ILoveJuliet"},
+        )
+
+        # Jabber User sends available presence broadcast to Server or sends
+        # directed presence to Gateway or a Legacy User.
+        # https://xmpp.org/extensions/xep-0100.html#example-26
+        self.recv(
+            """
+            <presence from='romeo@montague.lit/orchard'
+                    to='juliet@aim.shakespeare.lit'/>
+            <presence from='romeo@montague.lit/orchard'
+                    to='aim.shakespeare.lit'/>
+            """
+        )
+        # Gateway sends presence stanza to Jabber User expressing availability.
+        # https://xmpp.org/extensions/xep-0100.html#example-27
+        self.send(
+            """
+            <presence from='aim.shakespeare.lit'
+                      to='romeo@montague.lit'>
+            <priority>0</priority>
+            </presence>
+            """
+        )
+        self.assertTrue(event_result["user"] == "romeo@montague.lit/orchard")
+
+    def testLogout(self):
+        self.add_user()
+        event_result = {}
+
+        def legacy_logout(presence):
+            event_result["user"] = presence["from"]
+
+        self.xmpp.add_event_handler("legacy_logout", legacy_logout)
+        # Jabber User sends available presence broadcast to Server or sends
+        # directed presence to Gateway or a Legacy User.
+        # https://xmpp.org/extensions/xep-0100.html#example-32
+        self.recv(
+            """
+            <presence type='unavailable'
+                    from='romeo@montague.lit/orchard'
+                    to='aim.shakespeare.lit'/>
+            """
+        )
+        # Gateway sends presence stanza of type "unavailable" to Jabber User.
+        # https://xmpp.org/extensions/xep-0100.html#example-33
+        self.send(
+            """
+            <presence type='unavailable'
+                      from='aim.shakespeare.lit'
+                      to='romeo@montague.lit/orchard'>
+            <priority>0</priority>
+            </presence>
+            """
+        )
+        self.assertTrue(event_result["user"] == "romeo@montague.lit/orchard")
+
+    def testAddContact(self):
+        self.add_user()
+        # Had to lowercase capuletnurse everywhere
+        # Jabber User sends presence stanza of type "subscribe" to Legacy User.
+        self.recv(
+            """
+            <presence type='subscribe'
+                      from='romeo@montague.lit'
+                      to='capuletnurse@aim.shakespeare.lit'/>
+            """
+        )
+        # If Legacy User approves subscription request, Gateway sends presence stanza of
+        # type "subscribed" to Jabber User on behalf of Legacy User. [A1]
+        self.send(
+            """
+            <presence type='subscribed'
+                      from='capuletnurse@aim.shakespeare.lit'
+                      to='romeo@montague.lit'/>
+            """
+        )
+        # Had to remove the resource here
+        self.send(
+            """
+            <presence from='capuletnurse@aim.shakespeare.lit'
+                      to='romeo@montague.lit'/>
+            """
+        )
+        self.send(
+            """
+            <presence type='subscribe'
+                      from='capuletnurse@aim.shakespeare.lit'
+                      to='romeo@montague.lit'/>
+            """
+        )
+        self.recv(
+            """
+            <presence type='subscribed'
+                      from='romeo@montague.lit'
+                      to='capuletnurse@aim.shakespeare.lit'/>
+            """
+        )
+
+    def testAddContactFail(self):
+        self.add_user()
+        res = {}
+        async def legacy_contact_add(jid, node, ifrom, contact_jid):
+            res.update(**locals())
+            raise LegacyError
+        self.xmpp["xep_0100"].api.register(
+            legacy_contact_add, "legacy_contact_add"
+        )
+        self.recv(
+            """
+            <presence type='subscribe'
+                      from='romeo@montague.lit'
+                      to='juliet@aim.shakespeare.lit'/>
+            """
+        )
+        self.send(
+            """
+            <presence type='unsubscribed'
+                      from='juliet@aim.shakespeare.lit'
+                      to='romeo@montague.lit'/>
+            """
+        )
+        self.assertTrue(res["ifrom"] == "romeo@montague.lit")
+        self.assertTrue(res["contact_jid"] == "juliet@aim.shakespeare.lit")
+
+
+    def testRemoveContact(self):
+        self.add_user()
+        result = {}
+        # Jabber User sends IQ-set qualified by the 'jabber:iq:roster' namespace, containing subscription
+        # attribute with value of "remove".
+        async def legacy_contact_remove(jid, node, ifrom, contact_jid):
+            result.update(**locals())
+
+        self.xmpp["xep_0100"].api.register(
+            legacy_contact_remove, "legacy_contact_remove"
+        )
+
+        # Jabber User sends IQ-set qualified by the 'jabber:iq:roster' namespace, containing subscription
+        # attribute with value of "remove".
+        self.recv(  # server sends this
+            """
+            <presence type='unsubscribe'
+                      to='capuletnurse@aim.shakespeare.lit'
+                      from='romeo@montague.lit'/>
+            """
+        )
+        for ptype in "unsubscribe", "unsubscribed", "unavailable":
+            self.send(  # server sends this
+                f"""
+                <presence type='{ptype}'
+                        from='capuletnurse@aim.shakespeare.lit'
+                        to='romeo@montague.lit'/>
+                """
+            )
+
+        self.assertTrue(result["ifrom"] == "romeo@montague.lit")
+        self.assertTrue(
+            result["contact_jid"] == JID("CapuletNurse@aim.shakespeare.lit")
+        )
+
+    def testSendMessage(self):
+        self.xmpp["xep_0100"].transform_legacy_message(
+            jabber_user_jid="romeo@montague.lit",
+            legacy_contact_id="juliet",
+            body="Art thou not Romeo, and a Montague?",
+        )
+        self.send(
+            """
+            <message from='juliet@aim.shakespeare.lit'
+                     to='romeo@montague.lit'>
+            <body>Art thou not Romeo, and a Montague?</body>
+            </message>
+            """
+        )
+
+    def testLegacyMessage(self):
+        self.add_user()
+        result = {}
+
+        def legacy_message(msg):
+            result["msg"] = msg
+
+        self.xmpp.add_event_handler("legacy_message", legacy_message)
+        self.recv(
+            """
+            <message to='juliet@aim.shakespeare.lit'
+                     from='romeo@montague.lit'>
+            <body>Something shakespearian</body>
+            </message>
+            """
+        )
+        self.wait_for_send_queue()
+        self.assertTrue(result["msg"]["from"] == "romeo@montague.lit")
+        self.assertTrue(result["msg"]["to"] == "juliet@aim.shakespeare.lit")
+
+    def testPluginEnd(self):
+        exc = False
+        try:
+            self.xmpp.plugin.disable("xep_0100")
+        except Exception:
+            exc = True
+        self.assertFalse(exc)
+
+    def add_user(self):
+        self.xmpp.loop.run_until_complete(
+            self.xmpp["xep_0077"].api["user_validate"](
+                None,
+                None,
+                JID("romeo@montague.lit"),
+                {"username": "RomeoMyRomeo", "password": "ILoveJuliet"},
+            )
+        )
+
+    # TODO: edit reg
+    # TODO: unregister
+    # TODO: login fails
+
+
+logging.basicConfig(level=logging.DEBUG)
+suite = unittest.TestLoader().loadTestsFromTestCase(TestStreamGateway)