From 4847f834bd8f6a1168851b0918c080fc0e6c13b8 Mon Sep 17 00:00:00 2001
From: Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
Date: Sun, 18 Sep 2016 17:49:52 +0900
Subject: Add a plugin for XEP-0380: Explicit Message Encryption.

---
 slixmpp/plugins/xep_0380/__init__.py | 15 ++++++++
 slixmpp/plugins/xep_0380/eme.py      | 66 ++++++++++++++++++++++++++++++++++++
 slixmpp/plugins/xep_0380/stanza.py   | 16 +++++++++
 tests/test_stanza_xep_0380.py        | 37 ++++++++++++++++++++
 4 files changed, 134 insertions(+)
 create mode 100644 slixmpp/plugins/xep_0380/__init__.py
 create mode 100644 slixmpp/plugins/xep_0380/eme.py
 create mode 100644 slixmpp/plugins/xep_0380/stanza.py
 create mode 100644 tests/test_stanza_xep_0380.py

diff --git a/slixmpp/plugins/xep_0380/__init__.py b/slixmpp/plugins/xep_0380/__init__.py
new file mode 100644
index 00000000..fec9f60f
--- /dev/null
+++ b/slixmpp/plugins/xep_0380/__init__.py
@@ -0,0 +1,15 @@
+"""
+    Slixmpp: The Slick XMPP Library
+    Copyright (C) 2016 Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
+    This file is part of Slixmpp.
+
+    See the file LICENSE for copying permission.
+"""
+
+from slixmpp.plugins.base import register_plugin
+
+from slixmpp.plugins.xep_0380.stanza import Encryption
+from slixmpp.plugins.xep_0380.eme import XEP_0380
+
+
+register_plugin(XEP_0380)
diff --git a/slixmpp/plugins/xep_0380/eme.py b/slixmpp/plugins/xep_0380/eme.py
new file mode 100644
index 00000000..7ff09f65
--- /dev/null
+++ b/slixmpp/plugins/xep_0380/eme.py
@@ -0,0 +1,66 @@
+"""
+    Slixmpp: The Slick XMPP Library
+    Copyright (C) 2016 Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
+    This file is part of Slixmpp.
+
+    See the file LICENSE for copying permission.
+"""
+
+import logging
+
+import slixmpp
+from slixmpp.stanza import Message
+from slixmpp.xmlstream.handler import Callback
+from slixmpp.xmlstream.matcher import StanzaPath
+from slixmpp.xmlstream import register_stanza_plugin, ElementBase, ET
+from slixmpp.plugins import BasePlugin
+from slixmpp.plugins.xep_0380 import stanza, Encryption
+
+
+log = logging.getLogger(__name__)
+
+
+class XEP_0380(BasePlugin):
+
+    """
+    XEP-0380: Explicit Message Encryption
+    """
+
+    name = 'xep_0380'
+    description = 'XEP-0380: Explicit Message Encryption'
+    dependencies = {'xep_0030'}
+    default_config = {
+        'template': 'This message is encrypted with {name} ({namespace})',
+    }
+
+    mechanisms = {
+        'jabber:x:encrypted': 'Legacy OpenPGP',
+        'urn:xmpp:ox:0': 'OpenPGP for XMPP',
+        'urn:xmpp:otr:0': 'OTR',
+        'eu.siacs.conversations.axolotl': 'Legacy OMEMO',
+        'urn:xmpp:omemo:0': 'OMEMO',
+    }
+
+    def plugin_init(self):
+        self.xmpp.register_handler(
+            Callback('Explicit Message Encryption',
+                     StanzaPath('message/eme'),
+                     self._handle_eme))
+
+        register_stanza_plugin(Message, Encryption)
+
+    def plugin_end(self):
+        self.xmpp.remove_handler('Chat State')
+
+    def session_bind(self, jid):
+        self.xmpp.plugin['xep_0030'].add_feature(Encryption.namespace)
+
+    def replace_body_with_eme(self, msg):
+        eme = msg['eme']
+        namespace = eme['namespace']
+        name = self.mechanisms[namespace] if namespace in self.mechanisms else eme['name']
+        body = self.config['template'].format(name=name, namespace=namespace)
+        msg['body'] = body
+
+    def _handle_eme(self, msg):
+        self.xmpp.event('message_encryption', msg)
diff --git a/slixmpp/plugins/xep_0380/stanza.py b/slixmpp/plugins/xep_0380/stanza.py
new file mode 100644
index 00000000..7dd678b1
--- /dev/null
+++ b/slixmpp/plugins/xep_0380/stanza.py
@@ -0,0 +1,16 @@
+"""
+    Slixmpp: The Slick XMPP Library
+    Copyright (C) 2016 Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
+    This file is part of Slixmpp.
+
+    See the file LICENSE for copying permission.
+"""
+
+from slixmpp.xmlstream import ElementBase
+
+
+class Encryption(ElementBase):
+    name = 'encryption'
+    namespace = 'urn:xmpp:eme:0'
+    plugin_attrib = 'eme'
+    interfaces = {'namespace', 'name'}
diff --git a/tests/test_stanza_xep_0380.py b/tests/test_stanza_xep_0380.py
new file mode 100644
index 00000000..9ed349bf
--- /dev/null
+++ b/tests/test_stanza_xep_0380.py
@@ -0,0 +1,37 @@
+import unittest
+from slixmpp import Message
+from slixmpp.test import SlixTest
+import slixmpp.plugins.xep_0380 as xep_0380
+from slixmpp.xmlstream import register_stanza_plugin
+
+
+class TestEME(SlixTest):
+
+    def setUp(self):
+        register_stanza_plugin(Message, xep_0380.stanza.Encryption)
+
+    def testCreateEME(self):
+        """Testing creating EME."""
+
+        xmlstring = """
+          <message>
+            <encryption xmlns="urn:xmpp:eme:0" namespace="%s"%s />
+          </message>
+        """
+
+        msg = self.Message()
+        self.check(msg, "<message />")
+
+        msg['eme']['namespace'] = 'urn:xmpp:otr:0'
+        self.check(msg, xmlstring % ('urn:xmpp:otr:0', ''))
+
+        msg['eme']['namespace'] = 'urn:xmpp:openpgp:0'
+        self.check(msg, xmlstring % ('urn:xmpp:openpgp:0', ''))
+
+        msg['eme']['name'] = 'OX'
+        self.check(msg, xmlstring % ('urn:xmpp:openpgp:0', ' name="OX"'))
+
+        del msg['eme']
+        self.check(msg, "<message />")
+
+suite = unittest.TestLoader().loadTestsFromTestCase(TestEME)
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