Add command firewall is-open <port> -p <protocol> for apps

share/actionsmap.yml

@@ -1408,6 +1408,25 @@ firewall:
                     help: If not raw, list UPnP forwarded ports instead of open ports
                     action: store_true
 
+        ### firewall_is_open()
+        is-open:
+            action_help: Returns whether the port is open or not.
+            api: GET /firewall/<protocol>/<port>
+            arguments:
+                port:
+                    help: Port or range of ports to close
+                    extra:
+                        pattern: &pattern_port_or_range
+                            - !!str ((^|(?!\A):)([0-9]{1,4}|[1-5][0-9]{4}|6[0-4][0-9]{3}|65[0-4][0-9]{2}|655[0-2][0-9]|6553[0-5])){1,2}?$
+                            - "pattern_port_or_range"
+                -p:
+                    full: --protocol
+                    help: "Protocol type (tcp/udp)"
+                    choices:
+                        - tcp
+                        - udp
+                    default: tcp
+
         ### firewall_open()
         open:
             action_help: Allow connections on a port
@@ -1416,9 +1435,7 @@ firewall:
                 port:
                     help: Port or range of ports to open
                     extra:
-                        pattern: &pattern_port_or_range
-                            - !!str ((^|(?!\A):)([0-9]{1,4}|[1-5][0-9]{4}|6[0-4][0-9]{3}|65[0-4][0-9]{2}|655[0-2][0-9]|6553[0-5])){1,2}?$
-                            - "pattern_port_or_range"
+                        pattern: *pattern_port_or_range
                 -p:
                     full: --protocol
                     help: "Protocol type (tcp/udp)"

src/firewall.py

@@ -255,6 +255,21 @@ def disable(self) -> None:
             self.enabled(False)
 
 
+def firewall_is_open(
+    port: int | str,
+    protocol: str,
+) -> bool:
+    """
+    Returns whether the specified port is open.
+
+    Keyword arguments:
+        port -- Port or range of ports to open
+        protocol -- Protocol type to allow (tcp/udp)
+
+    """
+    return port in firewall_list(raw=False, protocol=protocol, forwarded=False)
+
+
 def firewall_open(
     port: int | str,
     protocol: str,