chore: extract alias recipient name into function (#2252)

app/alias_utils.py

@@ -1,6 +1,7 @@
 import csv
 from io import StringIO
 import re
+from dataclasses import dataclass
 from typing import Optional, Tuple
 
 from email_validator import validate_email, EmailNotValidError
@@ -23,6 +24,7 @@ from app.email_utils import (
     send_cannot_create_domain_alias,
     send_email,
     render,
+    sl_formataddr,
 )
 from app.errors import AliasInTrashError
 from app.events.event_dispatcher import EventDispatcher
@@ -541,3 +543,31 @@ def change_alias_status(alias: Alias, enabled: bool, commit: bool = False):
 
     if commit:
         Session.commit()
+
+
+@dataclass
+class AliasRecipientName:
+    name: str
+    message: Optional[str] = None
+
+
+def get_alias_recipient_name(alias: Alias) -> AliasRecipientName:
+    """
+    Logic:
+    1. If alias has name, use it
+    2. If alias has custom domain, and custom domain has name, use it
+    3. Otherwise, use the alias email as the recipient
+    """
+    if alias.name:
+        return AliasRecipientName(
+            name=sl_formataddr((alias.name, alias.email)),
+            message=f"Put alias name {alias.name} in from header",
+        )
+    elif alias.custom_domain:
+        if alias.custom_domain.name:
+            return AliasRecipientName(
+                name=sl_formataddr((alias.custom_domain.name, alias.email)),
+                message=f"Put domain default alias name {alias.custom_domain.name} in from header",
+            )
+    else:
+        return AliasRecipientName(name=alias.email)

email_handler.py

@@ -53,7 +53,11 @@ from flanker.addresslib.address import EmailAddress
 from sqlalchemy.exc import IntegrityError
 
 from app import pgp_utils, s3, config, contact_utils
-from app.alias_utils import try_auto_create, change_alias_status
+from app.alias_utils import (
+    try_auto_create,
+    change_alias_status,
+    get_alias_recipient_name,
+)
 from app.config import (
     EMAIL_DOMAIN,
     URL,
@@ -1161,23 +1165,11 @@ def handle_reply(envelope, msg: Message, rcpt_to: str) -> (bool, str):
 
     Session.commit()
 
-    # make the email comes from alias
-    from_header = alias.email
-    # add alias name from alias
-    if alias.name:
-        LOG.d("Put alias name %s in from header", alias.name)
-        from_header = sl_formataddr((alias.name, alias.email))
-    elif alias.custom_domain:
-        # add alias name from domain
-        if alias.custom_domain.name:
-            LOG.d(
-                "Put domain default alias name %s in from header",
-                alias.custom_domain.name,
-            )
-            from_header = sl_formataddr((alias.custom_domain.name, alias.email))
-
-    LOG.d("From header is %s", from_header)
-    add_or_replace_header(msg, headers.FROM, from_header)
+    recipient_name = get_alias_recipient_name(alias)
+    if recipient_name.message:
+        LOG.d(recipient_name.message)
+    LOG.d("From header is %s", recipient_name.name)
+    add_or_replace_header(msg, headers.FROM, recipient_name.name)
 
     try:
         if str(msg[headers.TO]).lower() == "undisclosed-recipients:;":

tests/test_alias_utils.py

@@ -4,6 +4,7 @@ from app.alias_utils import (
     delete_alias,
     check_alias_prefix,
     get_user_if_alias_would_auto_create,
+    get_alias_recipient_name,
     try_auto_create,
 )
 from app.config import ALIAS_DOMAINS
@@ -18,7 +19,8 @@ from app.models import (
     User,
     DomainDeletedAlias,
 )
-from tests.utils import create_new_user, random_domain, random_token
+from app.utils import random_string
+from tests.utils import create_new_user, random_domain, random_token, random_email
 
 
 def test_delete_alias(flask_client):
@@ -131,3 +133,72 @@ def test_auto_create_alias(flask_client):
             assert result, f"Case {test_id} - Failed address {address}"
         else:
             assert result is None, f"Case {test_id} - Failed address {address}"
+
+
+# get_alias_recipient_name
+def test_get_alias_recipient_name_no_overrides():
+    user = create_new_user()
+    alias = Alias.create(
+        user_id=user.id,
+        email=random_email(),
+        mailbox_id=user.default_mailbox_id,
+        commit=True,
+    )
+    res = get_alias_recipient_name(alias)
+    assert res.message is None
+    assert res.name == alias.email
+
+
+def test_get_alias_recipient_name_alias_name():
+    user = create_new_user()
+    alias = Alias.create(
+        user_id=user.id,
+        email=random_email(),
+        mailbox_id=user.default_mailbox_id,
+        name=random_string(),
+        commit=True,
+    )
+    res = get_alias_recipient_name(alias)
+    assert res.message is not None
+    assert res.name == f"{alias.name} <{alias.email}>"
+
+
+def test_get_alias_recipient_alias_with_name_and_custom_domain_name():
+    user = create_new_user()
+    custom_domain = CustomDomain.create(
+        user_id=user.id,
+        domain=random_domain(),
+        name=random_string(),
+        verified=True,
+    )
+    alias = Alias.create(
+        user_id=user.id,
+        email=random_email(),
+        mailbox_id=user.default_mailbox_id,
+        name=random_string(),
+        custom_domain_id=custom_domain.id,
+        commit=True,
+    )
+    res = get_alias_recipient_name(alias)
+    assert res.message is not None
+    assert res.name == f"{alias.name} <{alias.email}>"
+
+
+def test_get_alias_recipient_alias_without_name_and_custom_domain_name():
+    user = create_new_user()
+    custom_domain = CustomDomain.create(
+        user_id=user.id,
+        domain=random_domain(),
+        name=random_string(),
+        verified=True,
+    )
+    alias = Alias.create(
+        user_id=user.id,
+        email=random_email(),
+        mailbox_id=user.default_mailbox_id,
+        custom_domain_id=custom_domain.id,
+        commit=True,
+    )
+    res = get_alias_recipient_name(alias)
+    assert res.message is not None
+    assert res.name == f"{custom_domain.name} <{alias.email}>"