feat: Add --wns option to handle WNS header

Microsoft has introduced [extra
header](https://learn.microsoft.com/en-us/windows/apps/design/shell/tiles-and-notifications/push-request-response-headers#request-parameters)
requirements for incoming push messages. I kind of want to avoid adding
a lot of system specific smarts to pywebpush, mostly because that's an
endless road of feature creep. The preferred way to handle this would be
to include the extra, call specific headers in the `webpush(...,
headers=dict(...))` argument.

Closes #162

pywebpush/__init__.py

@@ -424,9 +424,10 @@ def send(self, *args, **kwargs) -> Union[Response, str]:
             **params,
         )
         self.verb(
-            "\nResponse:\n\tcode: {}\n\tbody: {}\n",
+            "\nResponse:\n\tcode: {}\n\tbody: {}\n\theaders: {}",
             resp.status_code,
             resp.text or "Empty",
+            resp.headers or "None"
         )
         return resp
 

pywebpush/__main__.py

@@ -2,6 +2,7 @@
 import os
 import json
 import logging
+import math
 
 from requests import JSONDecodeError
 
@@ -15,6 +16,11 @@ def get_config():
     parser.add_argument("--head", help="Header Info JSON file")
     parser.add_argument("--claims", help="Vapid claim file")
     parser.add_argument("--key", help="Vapid private key file path")
+    parser.add_argument(
+        "--wns",
+        help="Include WNS cache header based on TTL",
+        default=False,
+        action="store_true")
     parser.add_argument(
         "--curl",
         help="Don't send, display as curl command",
@@ -53,6 +59,15 @@ def get_config():
                     args.head = json.loads(r.read())
                 except JSONDecodeError as e:
                     raise WebPushException("Could not read the header arguments: {}", e)
+        # Set the default "TTL"
+        args.head["ttl"] = args.head.get("ttl", "0")
+        if args.wns:
+            # NOTE: Microsoft also requires `X-WNS-Type` as
+            # `tile`, `toast`, `badge` or `raw`. This is not provided by this code.
+            if int(args.head.get("ttl", "0")) > 0:
+                args.head["x-wns-cache-policy"] = "cache"
+            else:
+                args.head["x-wns-cache-policy"] = "no-cache"
         if args.claims:
             if not args.key:
                 raise WebPushException("No private --key specified for claims")