Enable negation when parsing monthdays and weekdays

This change enables parsing of the "!" character for monthdays
and weekdays paraemters of a firewall redirect object when present
in UCI configuration.

This change does not add support for negation in NetJSON config.

netjsonconfig/backends/openwrt/converters/firewall.py

@@ -205,7 +205,31 @@ def __netjson_redirect(self, redirect):
                     redirect["proto"] = ["tcp", "udp"]
                 else:
                     redirect["proto"] = [proto]
+
+        if "weekdays" in redirect:
+            weekdays = redirect["weekdays"]
+            if not isinstance(weekdays, list):
+                weekdays = weekdays.split()
+            # UCI allows the first entry to be "!" which means negate the remaining
+            # entries
+            if weekdays[0] == "!":
+                all_days = ["sun", "mon", "tue", "wed", "thu", "fri", "sat"]
+                wd = set([x for x in weekdays[1:]])
+                redirect["weekdays"] = list(set(all_days) - wd)
+                # Sort the days for predictability when testing
+                redirect["weekdays"].sort(key=lambda v: all_days.index(v))
+
         if "monthdays" in redirect:
-            redirect["monthdays"] = [int(x) for x in redirect["monthdays"]]
+            monthdays = redirect["monthdays"]
+            if not isinstance(monthdays, list):
+                monthdays = monthdays.split()
+            # UCI allows the first entry to be "!" which means negate the remaining
+            # entries
+            if monthdays[0] == "!":
+                all_days = set(range(1,32))
+                md = set([int(x) for x in monthdays[1:]])
+                redirect["monthdays"] = list(all_days - md)
+            else:
+                redirect["monthdays"] = [int(x) for x in monthdays]
 
         return self.type_cast(redirect)

tests/openwrt/test_firewall.py

@@ -484,3 +484,43 @@ def test_redirect_monthdays_validation_error_2(self):
         o = OpenWrt({"firewall": {"redirects": [{"monthdays": [0, 2, 8]}]}})
         with self.assertRaises(ValidationError):
             o.validate()
+
+    _redirect_3_uci = textwrap.dedent(
+        """\
+        package firewall
+
+        config defaults 'defaults'
+
+        config redirect 'redirect_Adblock DNS, port 53'
+            option name 'Adblock DNS, port 53'
+            option src 'lan'
+            option proto 'tcpudp'
+            option src_dport '53'
+            option dest_port '53'
+            option target 'DNAT'
+            option weekdays '! mon tue wed'
+            option monthdays '! 1 2 3 4 5'
+        """
+    )
+
+    _redirect_3_netjson = {
+        "firewall": {
+            "redirects": [
+                {
+                    "name": "Adblock DNS, port 53",
+                    "src": "lan",
+                    "proto": ["tcp", "udp"],
+                    "src_dport": "53",
+                    "dest_port": "53",
+                    "target": "DNAT",
+                    "weekdays": ["sun", "thu", "fri", "sat"],
+                    "monthdays": [6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31],
+                }
+            ]
+        }
+    }
+
+    def test_parse_redirect_3(self):
+        o = OpenWrt(native=self._redirect_3_uci)
+        print(o.config)
+        self.assertEqual(o.config, self._redirect_3_netjson)