fix(fastapi): sanitize PP/O parameters for package search

This definitely leaked through in more areas. We'll need to reuse
this new utility function in a few other routes in upcoming commits.

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

aurweb/routers/packages.py

@@ -30,8 +30,11 @@ async def packages_get(request: Request, context: Dict[str, Any],
     context["q"] = dict(request.query_params)
 
     # Per page and offset.
-    per_page = context["PP"] = int(request.query_params.get("PP", 50))
-    offset = context["O"] = int(request.query_params.get("O", 0))
+    offset, per_page = util.sanitize_params(
+        request.query_params.get("O", defaults.O),
+        request.query_params.get("PP", defaults.PP))
+    context["O"] = offset
+    context["PP"] = per_page
 
     # Query search by.
     search_by = context["SeB"] = request.query_params.get("SeB", "nd")

aurweb/util.py

@@ -7,7 +7,7 @@ import secrets
 import string
 
 from datetime import datetime
-from typing import Any, Callable, Dict, Iterable
+from typing import Any, Callable, Dict, Iterable, Tuple
 from urllib.parse import urlencode, urlparse
 from zoneinfo import ZoneInfo
 
@@ -18,7 +18,7 @@ from jinja2 import pass_context
 
 import aurweb.config
 
-from aurweb import logging
+from aurweb import defaults, logging
 
 logger = logging.get_logger(__name__)
 
@@ -155,3 +155,17 @@ def get_ssh_fingerprints():
 def apply_all(iterable: Iterable, fn: Callable):
     for item in iterable:
         fn(item)
+
+
+def sanitize_params(offset: str, per_page: str) -> Tuple[int, int]:
+    try:
+        offset = int(offset)
+    except ValueError:
+        offset = defaults.O
+
+    try:
+        per_page = int(per_page)
+    except ValueError:
+        per_page = defaults.PP
+
+    return (offset, per_page)

test/test_packages_routes.py

@@ -486,15 +486,11 @@ def test_pkgbase(client: TestClient, package: Package):
 
 
 def test_packages(client: TestClient, packages: List[Package]):
-    """ Test the / packages route with defaults.
-
-    Defaults:
-        50 results per page
-        offset of 0
-    """
     with client as request:
         response = request.get("/packages", params={
-            "SeB": "X"  # "X" isn't valid, defaults to "nd"
+            "SeB": "X",  # "X" isn't valid, defaults to "nd"
+            "PP": "1 or 1",
+            "O": "0 or 0"
         })
     assert response.status_code == int(HTTPStatus.OK)