3 files changed, 101 insertions, 0 deletions
diff --git a/slixmpp/plugins/xep_0461/__init__.py b/slixmpp/plugins/xep_0461/__init__.py
new file mode 100644
index 00000000..1e9b2829
--- /dev/null
+++ b/slixmpp/plugins/xep_0461/__init__.py
@@ -0,0 +1,6 @@
+from slixmpp.plugins.base import register_plugin
+
+from .reply import XEP_0461
+from . import stanza
+
+register_plugin(XEP_0461)
diff --git a/slixmpp/plugins/xep_0461/reply.py b/slixmpp/plugins/xep_0461/reply.py
new file mode 100644
index 00000000..6607012a
--- /dev/null
+++ b/slixmpp/plugins/xep_0461/reply.py
@@ -0,0 +1,48 @@
+from slixmpp.plugins import BasePlugin
+from slixmpp.types import JidStr
+from slixmpp.xmlstream import StanzaBase
+from slixmpp.xmlstream.handler import Callback
+from slixmpp.xmlstream.matcher import StanzaPath
+
+from . import stanza
+
+
+class XEP_0461(BasePlugin):
+    """XEP-0461: Message Replies"""
+
+    name = "xep_0461"
+    description = "XEP-0461: Message Replies"
+
+    dependencies = {"xep_0030"}
+    stanza = stanza
+    namespace = stanza.NS
+
+    def plugin_init(self) -> None:
+        stanza.register_plugins()
+        self.xmpp.register_handler(
+            Callback(
+                "Message replied to",
+                StanzaPath("message/reply"),
+                self._handle_reply_to_message,
+            )
+        )
+
+    def plugin_end(self):
+        self.xmpp.plugin["xep_0030"].del_feature(feature=stanza.NS)
+
+    def session_bind(self, jid):
+        self.xmpp.plugin["xep_0030"].add_feature(feature=stanza.NS)
+
+    def _handle_reply_to_message(self, msg: StanzaBase):
+        self.xmpp.event("message_reply", msg)
+
+    def send_reply(self, reply_to: JidStr, reply_id: str, **msg_kwargs):
+        """
+
+        :param reply_to: Full JID of the quoted author
+        :param reply_id: ID of the message to reply to
+        """
+        msg = self.xmpp.make_message(**msg_kwargs)
+        msg["reply"]["to"] = reply_to
+        msg["reply"]["id"] = reply_id
+        msg.send()
diff --git a/slixmpp/plugins/xep_0461/stanza.py b/slixmpp/plugins/xep_0461/stanza.py
new file mode 100644
index 00000000..b99b2745
--- /dev/null
+++ b/slixmpp/plugins/xep_0461/stanza.py
@@ -0,0 +1,47 @@
+from slixmpp.stanza import Message
+from slixmpp.xmlstream import ElementBase, register_stanza_plugin
+
+NS = "urn:xmpp:reply:0"
+
+
+class Reply(ElementBase):
+    namespace = NS
+    name = "reply"
+    plugin_attrib = "reply"
+    interfaces = {"id", "to"}
+
+
+class FeatureFallBack(ElementBase):
+    # should also be a multi attrib
+    namespace = "urn:xmpp:feature-fallback:0"
+    name = "fallback"
+    plugin_attrib = "feature_fallback"
+    interfaces = {"for"}
+
+    def get_stripped_body(self):
+        # only works for a single fallback_body attrib
+        start = self["fallback_body"]["start"]
+        end = self["fallback_body"]["end"]
+        body = self.parent()["body"]
+        try:
+            start = int(start)
+            end = int(end)
+        except ValueError:
+            return body
+        else:
+            return body[:start] + body[end:]
+
+
+class FallBackBody(ElementBase):
+    # According to https://xmpp.org/extensions/inbox/compatibility-fallback.html
+    # this should be a multi_attrib *but* since it's a protoXEP, we'll see...
+    namespace = FeatureFallBack.namespace
+    name = "body"
+    plugin_attrib = "fallback_body"
+    interfaces = {"start", "end"}
+
+
+def register_plugins():
+    register_stanza_plugin(Message, Reply)
+    register_stanza_plugin(Message, FeatureFallBack)
+    register_stanza_plugin(FeatureFallBack, FallBackBody)