feat(urllib.request): add importlib resource handler

src/byteb4rb1e/utils/urllib/request.py

@@ -1,4 +1,6 @@
+import email
 import importlib.resources
+import mimetypes
 from urllib.request import URLError
 import urllib.request
 
@@ -6,15 +8,13 @@ import urllib.request
 class PkgHandler(urllib.request.BaseHandler):
     """
     """
-    def pkg_open(self, req):
+    def pkg_open(self, req) -> urllib.request.addinfourl:
         pkg_files = importlib.resources.files(req.host)
 
-        raise Exception(sorted(pkg_files.glob('**/*')))
-
         try:
-            fh = list(
+            fh = next(
                 pkg_files.glob(req.selector.lstrip('//'))
-            )[0].open('rb')
+            ).open('rb')
         except Exception as e:
             raise URLError(f'{e.__class__.__name__}: {e}') from e
 
@@ -22,15 +22,17 @@ class PkgHandler(urllib.request.BaseHandler):
         size = fh.tell();
         fh.seek(0);
 
-        mtype, _ = mimetypes.guess_type(url)
+        mtype, _ = mimetypes.guess_type(req.selector)
 
         headers = email.message_from_string(
             'Content-Type: %s\nContent-Length: %d\n' %
             (mtype or 'text/plain', size)
         )
 
-        if not mtype or mtype.starts_with('text/'):
+        if not mtype or mtype.startswith('text/'):
             fh.close()
-            fh = importlib.resources.files(req.host).glob(req.selector)[0].open('r')
+            fh = next(
+                pkg_files.glob(req.selector.lstrip('//'))
+            ).open('r')
 
-        return urllib.request.addinfourl(fh, header)
+        return urllib.request.addinfourl(fh, headers, None)