Requirement for live agent (#38)

* Create new requirements file to run abilities only if agent paw exists

* Remove debug print statements

* Remove blank lines

* Add requirement for Lightneuron implant

* Adjust blank lines

* Fix syntax

app/requirements/check_lightneuron_registered.py

@@ -0,0 +1,21 @@
+from plugins.stockpile.app.requirements.base_requirement import BaseRequirement
+from app.utility.base_service import BaseService
+
+
+class Requirement(BaseRequirement):
+
+    async def enforce(self, link, operation):
+        """
+        Given a link and the current operation, ensure the ability will only run if the
+        agent with the given ID/PAW is listed in the Agents tab on the Caldera Server GUI.
+        :param link
+        :param operation
+        :return: True if it complies, False if it doesn't
+        """
+        agent_paws = [agent.paw for agent in BaseService.get_service('data_svc').ram['agents']]
+        for uf in link.used:
+            # Remove the "@" character if it appears in the given fact
+            # In order to accomodate the Lightneuron implant ID
+            if uf.value.replace("@", "") in agent_paws:
+                return True
+        return False

app/requirements/check_registered.py

@@ -0,0 +1,17 @@
+from plugins.stockpile.app.requirements.base_requirement import BaseRequirement
+
+
+class Requirement(BaseRequirement):
+
+    async def enforce(self, link, operation):
+        """
+        Given a link and the current operation, ensure will only run if the agent with the given ID/PAW is alive.
+        :param link
+        :param operation
+        :return: True if it complies, False if it doesn't
+        """
+        agent_paws = [agent.paw for agent in await operation.active_agents()]
+        for uf in link.used:
+            if uf.value in agent_paws:
+                return True
+        return False