bicep/matrix: enable smtp auth

yolo lmao

hosts/bicep/services/matrix/smtp-authenticator/smtp_auth_provider.py

@@ -0,0 +1,45 @@
+from typing import Awaitable, Callable, Optional, Tuple
+
+from smtplib import SMTP_SSL as SMTP
+
+import synapse
+from synapse import module_api
+
+
+class SMTPAuthProvider:
+    def __init__(self, config: dict, api: module_api):
+        self.api = api
+
+        self.config = config
+
+        api.register_password_auth_provider_callbacks(
+            auth_checkers={
+                ("m.login.password", ("password",)): self.check_pass,
+            },
+        )
+
+    async def check_pass(
+        self,
+        username: str,
+        login_type: str,
+        login_dict: "synapse.module_api.JsonDict",
+    ):
+        if login_type != "m.login.password":
+            return None
+
+        result = False
+        with SMTP(self.config["smtp_host"]) as smtp:
+            password = login_dict.get("password")
+            try:
+                smtp.login(username, password)
+                result = True
+            except:
+                return None
+
+        if result == True:
+            userid = self.api.get_qualified_user_id(username)
+            if not self.api.check_user_exists(userid):
+                self.api.register_user(username)
+            return (userid, None)
+        else:
+            return None