add Contact.new_addr()

app/email_utils.py

@@ -381,25 +381,6 @@ def get_orig_message_from_spamassassin_report(msg: Message) -> Message:
             return part
 
 
-def new_addr(old_addr, new_email, user: User) -> str:
-    """replace First Last <first@example.com> by
-    first@example.com by SimpleLogin <new_email>
-
-    `new_email` is a special reply address
-    """
-    name, old_email = parseaddr(old_addr)
-    if user.use_via_format_for_sender:
-        new_name = f"{old_email} via SimpleLogin"
-    else:
-        name = name or ""
-        new_name = (
-            name + (" - " if name else "") + old_email.replace("@", " at ")
-        ).strip()
-
-    new_addr = formataddr((new_name, new_email)).strip()
-    return new_addr.strip()
-
-
 def get_addrs_from_header(msg: Message, header) -> [str]:
     """Get all addresses contained in `header`
     Used for To or CC header.

app/models.py

@@ -749,6 +749,7 @@ class Contact(db.Model, ModelMixin):
     is_cc = db.Column(db.Boolean, nullable=False, default=False, server_default="0")
 
     alias = db.relationship(Alias, backref="contacts")
+    user = db.relationship(User)
 
     def website_send_to(self):
         """return the email address with name.
@@ -785,6 +786,27 @@ class Contact(db.Model, ModelMixin):
         # cannot use formataddr here as this field is for email client, not for MTA
         return f'"{name}" <{self.reply_email}>'
 
+    def new_addr(self):
+        """
+        Replace original email by reply_email. 2 possible formats:
+        - first@example.com by SimpleLogin <reply_email> OR
+        - First Last - first at example.com <reply_email>
+        And return new address with RFC 2047 format
+
+        `new_email` is a special reply address
+        """
+        user = self.user
+        if user.use_via_format_for_sender:
+            new_name = f"{self.website_email} via SimpleLogin"
+        else:
+            name = self.name or ""
+            new_name = (
+                name + (" - " if name else "") + self.website_email.replace("@", " at ")
+            ).strip()
+
+        new_addr = formataddr((new_name, self.reply_email)).strip()
+        return new_addr.strip()
+
     def last_reply(self) -> "EmailLog":
         """return the most recent reply"""
         return (

tests/test_models.py

@@ -4,6 +4,7 @@ import arrow
 import pytest
 
 from app.config import EMAIL_DOMAIN, MAX_NB_EMAIL_FREE_PLAN
+from app.email_utils import parseaddr_unicode
 from app.extensions import db
 from app.models import generate_email, User, Alias, Contact
 
@@ -93,3 +94,43 @@ def test_website_send_to(flask_client):
     c1.name = None
     c1.website_from = "=?UTF-8?B?TmjGoW4gTmd1eeG7hW4=?= <abcd@example.com>"
     assert c1.website_send_to() == '"Nhơn Nguyễn | abcd at example.com" <rep@SL>'
+
+
+def test_new_addr(flask_client):
+    user = User.create(
+        email="a@b.c", password="password", name="Test User", activated=True
+    )
+    db.session.commit()
+
+    alias = Alias.create_new_random(user)
+    db.session.commit()
+
+    # use_via_format_for_sender is by default
+    c1 = Contact.create(
+        user_id=user.id,
+        alias_id=alias.id,
+        website_email="abcd@example.com",
+        reply_email="rep@SL",
+        name="First Last",
+    )
+    db.session.commit()
+    assert c1.new_addr() == '"abcd@example.com via SimpleLogin" <rep@SL>'
+
+    # use_via_format_for_sender = False
+    user.use_via_format_for_sender = False
+    db.session.commit()
+    assert c1.new_addr() == '"First Last - abcd at example.com" <rep@SL>'
+
+    # unicode name
+    c1.name = "Nhơn Nguyễn"
+    db.session.commit()
+    assert (
+        c1.new_addr()
+        == "=?utf-8?q?Nh=C6=A1n_Nguy=E1=BB=85n_-_abcd_at_example=2Ecom?= <rep@SL>"
+    )
+
+    # sanity check for parseaddr_unicode
+    assert parseaddr_unicode(c1.new_addr()) == (
+        "Nhơn Nguyễn - abcd at example.com",
+        "rep@sl",
+    )