[FastAPI] add /rss and /rss/modified

There are slight differences in that, with `python-feedgen`,
an empty description field completely omits the description,
but includes the description when there is one.

Signed-off-by: Kevin Morris <kevr@0cost.org>

test/test_rss.py

@@ -0,0 +1,110 @@
+import logging
+
+from datetime import datetime
+from http import HTTPStatus
+
+import lxml.etree
+import pytest
+
+from fastapi.testclient import TestClient
+
+from aurweb import db
+from aurweb.asgi import app
+from aurweb.models.account_type import AccountType
+from aurweb.models.package import Package
+from aurweb.models.package_base import PackageBase
+from aurweb.models.user import User
+from aurweb.testing import setup_test_db
+
+logger = logging.getLogger(__name__)
+
+
+@pytest.fixture(autouse=True)
+def setup():
+    setup_test_db(
+        Package.__tablename__,
+        PackageBase.__tablename__,
+        User.__tablename__)
+
+
+@pytest.fixture
+def client():
+    yield TestClient(app=app)
+
+
+@pytest.fixture
+def user():
+    account_type = db.query(AccountType,
+                            AccountType.AccountType == "User").first()
+    yield db.create(User, Username="test",
+                    Email="test@example.org",
+                    RealName="Test User",
+                    Passwd="testPassword",
+                    AccountType=account_type)
+
+
+@pytest.fixture
+def packages(user):
+    pkgs = []
+    now = int(datetime.utcnow().timestamp())
+
+    # Create 101 packages; we limit 100 on RSS feeds.
+    for i in range(101):
+        pkgbase = db.create(
+            PackageBase, Maintainer=user, Name=f"test-package-{i}",
+            SubmittedTS=(now + i), ModifiedTS=(now + i), autocommit=False)
+        pkg = db.create(Package, Name=pkgbase.Name, PackageBase=pkgbase,
+                        autocommit=False)
+        pkgs.append(pkg)
+    db.commit()
+    yield pkgs
+
+
+def parse_root(xml):
+    return lxml.etree.fromstring(xml)
+
+
+def test_rss(client, user, packages):
+    with client as request:
+        response = request.get("/rss/")
+    assert response.status_code == int(HTTPStatus.OK)
+
+    # Test that the RSS we got is sorted by descending SubmittedTS.
+    def key_(pkg):
+        return pkg.PackageBase.SubmittedTS
+    packages = list(reversed(sorted(packages, key=key_)))
+
+    # Just take the first 100.
+    packages = packages[:100]
+
+    root = parse_root(response.content)
+    items = root.xpath("//channel/item")
+    assert len(items) == 100
+
+    for i, item in enumerate(items):
+        title = next(iter(item.xpath('./title')))
+        logger.debug(f"title: '{title.text}' vs name: '{packages[i].Name}'")
+        assert title.text == packages[i].Name
+
+
+def test_rss_modified(client, user, packages):
+    with client as request:
+        response = request.get("/rss/modified")
+    assert response.status_code == int(HTTPStatus.OK)
+
+    # Test that the RSS we got is sorted by descending SubmittedTS.
+    def key_(pkg):
+        return pkg.PackageBase.ModifiedTS
+    packages = list(reversed(sorted(packages, key=key_)))
+
+    # Just take the first 100.
+    packages = packages[:100]
+
+    root = parse_root(response.content)
+    items = root.xpath("//channel/item")
+    assert len(items) == 100
+
+    for i, item in enumerate(items):
+        title = next(iter(item.xpath('./title')))
+        logger.debug(f"title: '{title.text}' vs name: '{packages[i].Name}'")
+        assert title.text == packages[i].Name