Generalize static file setup.

src/allmydata/web/common.py

@@ -4,6 +4,8 @@ Ported to Python 3.
 from __future__ import annotations
 
 from six import ensure_str
+from importlib.resources import files as resource_files, as_file
+from contextlib import ExitStack
 
 from typing import Optional, Union, TypeVar, overload
 from typing_extensions import Literal
@@ -29,6 +31,7 @@ from twisted.web import (
     http,
     resource,
     template,
+    static,
 )
 from twisted.web.iweb import (
     IRequest,
@@ -852,3 +855,28 @@ def get_keypair(request: IRequest) -> tuple[PublicKey, PrivateKey] | None:
         return None
     privkey, pubkey = create_signing_keypair_from_string(urlsafe_b64decode(privkey_der))
     return pubkey, privkey
+
+
+class StaticFiles:
+    """
+    Serve static files includes as resources.
+
+    Package resources may be on the filesystem, or they may be in a zip
+    or something, so we need to do a bit more work to serve them as
+    static files.
+    """
+
+    def __init__(self):
+        self._temporary_file_manager = ExitStack()
+
+    @classmethod
+    def add_static_children(cls, root: IResource):
+        """Add static files from C{allmydata.web} to the given resource."""
+        self = cls()
+        static_dir = resource_files("allmydata.web") / "static"
+        for child in static_dir.iterdir():
+            child_path = child.name.encode("utf-8")
+            root.putChild(child_path, static.File(
+                self._temporary_file_manager.enter_context(as_file(child))
+            ))
+        root.__static_files_cleanup = self

src/allmydata/web/introweb.py

@@ -1,26 +1,16 @@
 """
 Ported to Python 3.
 """
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-from __future__ import unicode_literals
-
-from future.utils import PY2
-if PY2:
-    from future.builtins import filter, map, zip, ascii, chr, hex, input, next, oct, open, pow, round, super, bytes, dict, list, object, range, str, max, min  # noqa: F401
-
-import time, os
-from pkg_resources import resource_filename
+import time
 from twisted.web.template import Element, XMLFile, renderElement, renderer
 from twisted.python.filepath import FilePath
-from twisted.web import static
 import allmydata
 from allmydata.util import idlib, jsonbytes as json
 from allmydata.web.common import (
     render_time,
     MultiFormatResource,
     SlotsSequenceElement,
+    StaticFiles
 )
 
 
@@ -38,9 +28,7 @@ class IntroducerRoot(MultiFormatResource):
         self.introducer_service = introducer_node.getServiceNamed("introducer")
         # necessary as a root Resource
         self.putChild(b"", self)
-        static_dir = resource_filename("allmydata.web", "static")
-        for filen in os.listdir(static_dir):
-            self.putChild(filen.encode("utf-8"), static.File(os.path.join(static_dir, filen)))
+        StaticFiles.add_static_children(self)
 
     def _create_element(self):
         """

src/allmydata/web/root.py

@@ -4,8 +4,6 @@ Ported to Python 3.
 import os
 import time
 from urllib.parse import quote as urlquote
-from importlib.resources import files as resource_files, as_file
-from contextlib import ExitStack
 
 from hyperlink import DecodedURL, URL
 from twisted.web import (
@@ -46,6 +44,7 @@ from allmydata.web.common import (
     render_time_delta,
     render_time,
     render_time_attr,
+    StaticFiles,
 )
 from allmydata.web.private import (
     create_private_tree,
@@ -243,22 +242,9 @@ class Root(MultiFormatResource):
         self.putChild(b"named", FileHandler(client))
         self.putChild(b"status", status.Status(client.get_history()))
         self.putChild(b"statistics", status.Statistics(client.stats_provider))
-
-        # Package resources may be on the filesystem, or they may be in a zip
-        # or something, so we need to do a bit more work to serve them as
-        # static files.
-        self._temporary_file_manager = ExitStack()
-        static_dir = resource_files("allmydata.web") / "static"
-        for child in static_dir.iterdir():
-            child_path = child.name.encode("utf-8")
-            self.putChild(child_path, static.File(
-                self._temporary_file_manager.enter_context(as_file(child))
-            ))
-
         self.putChild(b"report_incident", IncidentReporter())
 
-    def __del__(self):
-        self._temporary_file_manager.close()
+        StaticFiles.add_static_children(self)
 
     @exception_to_child
     def getChild(self, path, request):