Send out notifications to users via meta.sr.ht GQL

This moves handling of (potentially) encrypted emails into the
meta.sr.ht API. Emails to external addresses are still sent
(unencrypted) via the core.sr.ht Pyhon module.

todosrht/email.py

@@ -1,9 +1,10 @@
-import html.parser
 import os
 import textwrap
 from string import Template
 from srht.config import cfg, cfgi
-from srht.email import send_email, lookup_key
+from srht.crypto import internal_anon
+from srht.email import send_email
+from srht.graphql import exec_gql
 from srht.oauth import current_user
 from todosrht.types import ParticipantType
 
@@ -15,15 +16,8 @@ def format_lines(text, quote=False):
     return "\n".join(wrapped)
 
 def notify(sub, template, subject, headers, **kwargs):
-    encrypt_key = None
     to = sub.participant
-    if to.participant_type == ParticipantType.email:
-        to = to.email
-    elif to.participant_type == ParticipantType.user:
-        user = to.user
-        to = user.email
-        encrypt_key = lookup_key(user)
-    else:
+    if to.participant_type == ParticipantType.external:
         return
     with open(os.path.join(os.path.dirname(__file__), "emails", template)) as f:
         tmpl = Template(f.read())
@@ -31,4 +25,20 @@ def notify(sub, template, subject, headers, **kwargs):
             'root': origin,
             **kwargs,
         })
-    send_email(body, to, subject, encrypt_key=encrypt_key, **headers)
+    if to.participant_type == ParticipantType.email:
+        to = to.email
+        send_email(body, to, subject, **headers)
+    elif to.participant_type == ParticipantType.user:
+        user = to.user
+        to = user.username
+        msg = f"Subject: {subject}\n"
+        for hdr, val in headers.items():
+            msg += f"{hdr}: {val}\n"
+        msg += "\n" + body
+        email_mutation = """
+        mutation SendEmail($username: String!, $msg: String!) {
+            sendEmailNotification(username: $username, message: $msg)
+        }
+        """
+        r = exec_gql("meta.sr.ht", email_mutation, user=internal_anon,
+            username=to, msg=msg)