Bridge plaintext mentions of Telegram puppets into Telegram mentions

mautrix_telegram/__main__.py

@@ -35,6 +35,7 @@ from .user import init as init_user, User
 from .bot import init as init_bot
 from .portal import init as init_portal
 from .puppet import init as init_puppet
+from .formatter import init as init_formatter
 from .public import PublicBridgeWebsite
 from .context import Context
 
@@ -99,6 +100,7 @@ with appserv.run(config["appservice.hostname"], config["appservice.port"]) as st
     init_abstract_user(context)
     context.bot = init_bot(context)
     context.mx = MatrixHandler(context)
+    init_formatter(context)
     init_portal(context)
     init_puppet(context)
     startup_actions = init_user(context) + [start, context.mx.init_as_bot()]

mautrix_telegram/formatter/__init__.py

@@ -1,2 +1,8 @@
-from .from_matrix import matrix_reply_to_telegram, matrix_to_telegram, matrix_text_to_telegram
+from .from_matrix import (matrix_reply_to_telegram, matrix_to_telegram, matrix_text_to_telegram,
-from .from_telegram import telegram_reply_to_matrix, telegram_to_matrix
+                          init_mx)
+from .from_telegram import (telegram_reply_to_matrix, telegram_to_matrix, init_tg)
+
+
+def init(context):
+    init_mx(context)
+    init_tg(context)

mautrix_telegram/formatter/from_matrix.py

@@ -219,11 +219,46 @@ class MatrixParser(HTMLParser):
 
 
 command_regex = re.compile("(\s|^)!([A-Za-z0-9@]+)")
+plain_mention_regex = None
 
 
 def matrix_text_to_telegram(text):
     text = command_regex.sub(r"\1/\2", text)
-    return text
+    entities, pmr_replacer = plain_mention_to_text()
+    text = plain_mention_regex.sub(pmr_replacer, text)
+    return text, entities
+
+
+def plain_mention_to_text():
+    entities = []
+
+    def replacer(match):
+        puppet = pu.Puppet.find_by_displayname(match.group(2))
+        if puppet:
+            offset = match.start()
+            length = match.end() - offset
+            if puppet.username:
+                entity = MessageEntityMention(offset, length)
+                text = f"@{puppet.username}"
+            else:
+                entity = InputMessageEntityMentionName(offset, length,
+                                                       user_id=InputUser(puppet.tgid, 0))
+                text = puppet.displayname
+            entities.append(entity)
+            return text
+        return "".join(match.groups())
+
+    return entities, replacer
+
+
+def plain_mention_to_html(match):
+    puppet = pu.Puppet.find_by_displayname(match.group(2))
+    if puppet:
+        return (f"{match.group(1)}"
+                f"<a href='https://matrix.to/#/{puppet.mxid}'>"
+                f"{puppet.displayname}"
+                "</a>")
+    return "".join(match.groups())
 
 
 def matrix_to_telegram(html):
@@ -231,6 +266,7 @@ def matrix_to_telegram(html):
         parser = MatrixParser()
         html = html.replace("\n", "")
         html = command_regex.sub(r"\1<command>\2</command>", html)
+        html = plain_mention_regex.sub(plain_mention_to_html, html)
         parser.feed(add_surrogates(html))
         return remove_surrogates(parser.text.strip()), parser.entities
     except Exception:
@@ -258,3 +294,11 @@ def matrix_reply_to_telegram(content, tg_space, room_id=None):
     except KeyError:
         pass
     return None
+
+
+def init_mx(context):
+    global plain_mention_regex
+    config = context.config
+    dn_template = config.get("bridge.displayname_template", "{displayname} (Telegram)")
+    dn_template = re.escape(dn_template).replace(re.escape("{displayname}"), "[^>]+")
+    plain_mention_regex = re.compile(f"(\s|^)({dn_template})")

mautrix_telegram/formatter/from_telegram.py

@@ -254,3 +254,7 @@ def _parse_url(html, entity_text, url):
         url = "http://" + url
     html.append(f"<a href='{url}'>{entity_text}</a>")
     return False
+
+
+def init_tg(context):
+    pass

mautrix_telegram/portal.py

@@ -594,12 +594,9 @@ class Portal:
             for entity in entities:
                 if isinstance(entity, InputMessageEntityMentionName):
                     entity.user_id = await client.get_input_entity(entity.user_id.user_id)
-
-            return await client.send_message(self.peer, message, entities=entities,
-                                             reply_to=reply_to)
         else:
-            message = formatter.matrix_text_to_telegram(message["body"])
+            message, entities = formatter.matrix_text_to_telegram(message["body"])
-            return await client.send_message(self.peer, message, reply_to=reply_to)
+        return await client.send_message(self.peer, message, reply_to=reply_to)
 
     async def _handle_matrix_file(self, client, message, reply_to):
         file = await self.main_intent.download_file(message["url"])

mautrix_telegram/puppet.py

@@ -191,6 +191,21 @@ class Puppet:
 
         return None
 
+    @classmethod
+    def find_by_displayname(cls, displayname):
+        if not displayname:
+            return None
+
+        for _, puppet in cls.cache.items():
+            if puppet.displayname and puppet.displayname == displayname:
+                return puppet
+
+        puppet = DBPuppet.query.filter(DBPuppet.displayname == displayname).one_or_none()
+        if puppet:
+            return cls.from_db(puppet)
+
+        return None
+
 
 def init(context):
     global config