Add include/exclude filter support for pull-through caching

fixes: #706

Author: gerrod3

Diff for: CHANGES/706.feature

@@ -0,0 +1 @@
+Pull-through caching now respects the include/exclude filters on the upstream remote.

Diff for: docs/user/guides/publish.md

@@ -88,6 +88,9 @@ from the remote source and have Pulp store that package as orphaned content.
 pulp python distribution update --name foo --remote bar
 ```
 
+!!! note
+    Pull-through caching will respect the includes/excludes filters on the supplied remote.
+
 !!! warning
     Support for pull-through caching is provided as a tech preview in Pulp 3.
     Functionality may not work or may be incomplete. Also, backwards compatibility when upgrading

Diff for: pulp_python/app/pypi/views.py

@@ -1,6 +1,7 @@
+import json
 import logging
-import requests
 
+from aiohttp.client_exceptions import ClientError
 from rest_framework.viewsets import ViewSet
 from rest_framework.response import Response
 from django.core.exceptions import ObjectDoesNotExist
@@ -15,19 +16,21 @@
     Http404,
     HttpResponseForbidden,
     HttpResponseBadRequest,
-    StreamingHttpResponse
+    StreamingHttpResponse,
+    HttpResponse,
 )
 from drf_spectacular.utils import extend_schema
 from dynaconf import settings
 from itertools import chain
 from packaging.utils import canonicalize_name
 from urllib.parse import urljoin, urlparse, urlunsplit
 from pathlib import PurePath
-from pypi_simple import parse_links_stream_response
+from pypi_simple import ACCEPT_JSON_PREFERRED, ProjectPage
 
 from pulpcore.plugin.viewsets import OperationPostponedResponse
 from pulpcore.plugin.tasking import dispatch
 from pulpcore.plugin.util import get_domain
+from pulpcore.plugin.exceptions import TimeoutException
 from pulp_python.app.models import (
     PythonDistribution,
     PythonPackageContent,
@@ -37,14 +40,15 @@
     SummarySerializer,
     PackageMetadataSerializer,
     PackageUploadSerializer,
-    PackageUploadTaskSerializer
+    PackageUploadTaskSerializer,
 )
 from pulp_python.app.utils import (
     write_simple_index,
     write_simple_detail,
     python_content_to_json,
     PYPI_LAST_SERIAL,
     PYPI_SERIAL_CONSTANT,
+    get_remote_package_filter,
 )
 
 from pulp_python.app import tasks
@@ -233,27 +237,36 @@ def list(self, request, path):
 
     def pull_through_package_simple(self, package, path, remote):
         """Gets the package's simple page from remote."""
-        def parse_url(link):
-            parsed = urlparse(link.url)
-            digest, _, value = parsed.fragment.partition('=')
+        def parse_package(release_package):
+            parsed = urlparse(release_package.url)
             stripped_url = urlunsplit(chain(parsed[:3], ("", "")))
-            redirect = f'{path}/{link.text}?redirect={stripped_url}'
-            d_url = urljoin(self.base_content_url, redirect)
-            return link.text, d_url, value if digest == 'sha256' else ''
+            redirect_path = f'{path}/{release_package.filename}?redirect={stripped_url}'
+            d_url = urljoin(self.base_content_url, redirect_path)
+            return release_package.filename, d_url, release_package.digests.get("sha256", "")
+
+        rfilter = get_remote_package_filter(remote)
+        if not rfilter.filter_project(package):
+            raise Http404(f"{package} does not exist.")
 
         url = remote.get_remote_artifact_url(f'simple/{package}/')
-        kwargs = {}
-        if proxy_url := remote.proxy_url:
-            if remote.proxy_username or remote.proxy_password:
-                parsed_proxy = urlparse(proxy_url)
-                netloc = f"{remote.proxy_username}:{remote.proxy_password}@{parsed_proxy.netloc}"
-                proxy_url = urlunsplit((parsed_proxy.scheme, netloc, "", "", ""))
-            kwargs["proxies"] = {"http": proxy_url, "https": proxy_url}
-
-        response = requests.get(url, stream=True, **kwargs)
-        links = parse_links_stream_response(response)
-        packages = (parse_url(link) for link in links)
-        return StreamingHttpResponse(write_simple_detail(package, packages, streamed=True))
+        remote.headers = remote.headers or []
+        remote.headers.append({"Accept": ACCEPT_JSON_PREFERRED})
+        downloader = remote.get_downloader(url=url, max_retries=1)
+        try:
+            d = downloader.fetch()
+        except ClientError:
+            return HttpResponse(f"Failed to fetch {package} from {remote.url}.", status=502)
+        except TimeoutException:
+            return HttpResponse(f"{remote.url} timed out while fetching {package}.", status=504)
+
+        if d.headers["content-type"] == "application/vnd.pypi.simple.v1+json":
+            page = ProjectPage.from_json_data(json.load(open(d.path, "rb")), base_url=remote.url)
+        else:
+            page = ProjectPage.from_html(package, open(d.path, "rb").read(), base_url=remote.url)
+        packages = [
+            parse_package(p) for p in page.packages if rfilter.filter_release(package, p.version)
+        ]
+        return HttpResponse(write_simple_detail(package, packages))
 
     @extend_schema(operation_id="pypi_simple_package_read", summary="Get package simple page")
     def retrieve(self, request, path, package):

Diff for: pulp_python/app/utils.py

@@ -7,7 +7,8 @@
 from django.conf import settings
 from jinja2 import Template
 from packaging.utils import canonicalize_name
-from packaging.version import parse
+from packaging.requirements import Requirement
+from packaging.version import parse, InvalidVersion
 
 
 PYPI_LAST_SERIAL = "X-PYPI-LAST-SERIAL"
@@ -356,3 +357,80 @@ def write_simple_detail(project_name, project_packages, streamed=False):
     detail = Template(simple_detail_template)
     context = {"project_name": project_name, "project_packages": project_packages}
     return detail.stream(**context) if streamed else detail.render(**context)
+
+
+class PackageIncludeFilter:
+    """A special class to help filter Package's based on a remote's include/exclude"""
+
+    def __init__(self, remote):
+        self.remote = remote.cast()
+        self._filter_includes = self._parse_packages(self.remote.includes)
+        self._filter_excludes = self._parse_packages(self.remote.excludes)
+
+    def _parse_packages(self, packages):
+        config = defaultdict(lambda: defaultdict(list))
+        for value in packages:
+            requirement = Requirement(value)
+            requirement.name = canonicalize_name(requirement.name)
+            if requirement.specifier:
+                requirement.specifier.prereleases = True
+                config["range"][requirement.name].append(requirement)
+            else:
+                config["full"][requirement.name].append(requirement)
+        return config
+
+    def filter_project(self, project_name):
+        """Return true/false if project_name would be allowed through remote's filters."""
+        project_name = canonicalize_name(project_name)
+        include_full = self._filter_includes.get("full", {})
+        include_range = self._filter_includes.get("range", {})
+        include = set(include_range.keys()).union(include_full.keys())
+        if include and project_name not in include:
+            return False
+
+        exclude_full = self._filter_excludes.get("full", {})
+        if project_name in exclude_full:
+            return False
+
+        return True
+
+    def filter_release(self, project_name, version):
+        """Returns true/false if release would be allowed through remote's filters."""
+        project_name = canonicalize_name(project_name)
+        if not self.filter_project(project_name):
+            return False
+
+        try:
+            version = parse(version)
+        except InvalidVersion:
+            return False
+
+        include_range = self._filter_includes.get("range", {})
+        if project_name in include_range:
+            for req in include_range[project_name]:
+                if version in req.specifier:
+                    break
+            else:
+                return False
+
+        exclude_range = self._filter_excludes.get("range", {})
+        if project_name in exclude_range:
+            for req in exclude_range[project_name]:
+                if version in req.specifier:
+                    return False
+
+        return True
+
+
+_remote_filters = {}
+
+
+def get_remote_package_filter(remote):
+    if date_filter_tuple := _remote_filters.get(remote.pulp_id):
+        last_update, rfilter = date_filter_tuple
+        if last_update == remote.pulp_last_updated:
+            return rfilter
+
+    rfilter = PackageIncludeFilter(remote)
+    _remote_filters[remote.pulp_id] = (remote.pulp_last_updated, rfilter)
+    return rfilter

Diff for: pulp_python/tests/functional/api/test_full_mirror.py

@@ -5,17 +5,20 @@
 from pulp_python.tests.functional.constants import (
     PYPI_URL,
     PYTHON_XS_FIXTURE_CHECKSUMS,
+    PYTHON_SM_PROJECT_SPECIFIER,
+    PYTHON_SM_FIXTURE_RELEASES,
 )
 
 from pypi_simple import ProjectPage
+from packaging.version import parse
 from urllib.parse import urljoin, urlsplit
 
 
 def test_pull_through_install(
     python_bindings, python_remote_factory, python_distribution_factory, delete_orphans_pre
 ):
     """Tests that a pull-through distro can be installed from."""
-    remote = python_remote_factory(url=PYPI_URL)
+    remote = python_remote_factory(url=PYPI_URL, includes=[])
     distro = python_distribution_factory(remote=remote.pulp_href)
     PACKAGE = "pulpcore-releases"
 
@@ -40,7 +43,7 @@ def test_pull_through_install(
 @pytest.mark.parallel
 def test_pull_through_simple(python_remote_factory, python_distribution_factory, pulp_content_url):
     """Tests that the simple page is properly modified when requesting a pull-through."""
-    remote = python_remote_factory(url=PYPI_URL)
+    remote = python_remote_factory(url=PYPI_URL, includes=["shelf-reader"])
     distro = python_distribution_factory(remote=remote.pulp_href)
 
     url = f"{distro.base_url}simple/shelf-reader/"
@@ -54,6 +57,44 @@ def test_pull_through_simple(python_remote_factory, python_distribution_factory,
         assert PYTHON_XS_FIXTURE_CHECKSUMS[package.filename] == package.digests["sha256"]
 
 
+@pytest.mark.parallel
+def test_pull_through_filter(python_remote_factory, python_distribution_factory):
+    """Tests that pull-through respects the includes/excludes filter on the remote."""
+    remote = python_remote_factory(url=PYPI_URL, includes=["shelf-reader"])
+    distro = python_distribution_factory(remote=remote.pulp_href)
+
+    r = requests.get(f"{distro.base_url}simple/pulpcore/")
+    assert r.status_code == 404
+    assert r.json() == {"detail": "pulpcore does not exist."}
+
+    r = requests.get(f"{distro.base_url}simple/shelf-reader/")
+    assert r.status_code == 200
+
+    # Test complex include specifiers
+    remote = python_remote_factory(includes=PYTHON_SM_PROJECT_SPECIFIER)
+    distro = python_distribution_factory(remote=remote.pulp_href)
+    for package, releases in PYTHON_SM_FIXTURE_RELEASES.items():
+        url = f"{distro.base_url}simple/{package}/"
+        project_page = ProjectPage.from_response(requests.get(url), package)
+        packages = {p.filename for p in project_page.packages if not parse(p.version).is_prerelease}
+        assert packages == set(releases)
+
+    # Test exclude logic
+    remote = python_remote_factory(includes=[], excludes=["django"])
+    distro = python_distribution_factory(remote=remote.pulp_href)
+
+    r = requests.get(f"{distro.base_url}simple/django/")
+    assert r.status_code == 404
+    assert r.json() == {"detail": "django does not exist."}
+
+    r = requests.get(f"{distro.base_url}simple/pulpcore/")
+    assert r.status_code == 502
+    assert r.text == f"Failed to fetch pulpcore from {remote.url}."
+
+    r = requests.get(f"{distro.base_url}simple/shelf-reader/")
+    assert r.status_code == 200
+
+
 @pytest.mark.parallel
 def test_pull_through_with_repo(
     python_repo_with_sync, python_remote_factory, python_distribution_factory