fix: embed uploaded logo in emails

tests/test_email_auth_service.py

@@ -0,0 +1,41 @@
+from types import SimpleNamespace
+
+from bot.services.email_auth_service import EmailAuthService
+from bot.services.email_templates import EmailInlineImage
+
+
+def _settings():
+    return SimpleNamespace(
+        SMTP_FROM_NAME="Mini Shop",
+        SMTP_FROM_EMAIL="noreply@example.com",
+        WEBAPP_TITLE="Mini Shop",
+    )
+
+
+def test_build_email_message_attaches_inline_images_to_html_part():
+    service = EmailAuthService(_settings())
+
+    message = service._build_email_message(
+        email="user@example.com",
+        subject="Login code",
+        body="Your code: 123456",
+        html_body='<img src="cid:webapp-logo" alt="">',
+        inline_images=(
+            EmailInlineImage(
+                content_id="webapp-logo",
+                content_type="image/png",
+                data=b"\x89PNG\r\n\x1a\nlogo",
+            ),
+        ),
+    )
+
+    related_part = message.get_body(("related",))
+    assert related_part is not None
+    html_part = related_part.get_body(("html",))
+    assert html_part is not None
+    related_images = [part for part in related_part.iter_attachments()]
+
+    assert len(related_images) == 1
+    assert related_images[0].get_content_type() == "image/png"
+    assert related_images[0]["Content-ID"] == "<webapp-logo>"
+    assert related_images[0].get_content_disposition() == "inline"