Add static select to block kit library (#203)

Added static select to block kit and action handler for this type of action

response/slack/block_kit.py

@@ -146,3 +146,38 @@ def serialize(self):
             "type": self.text_type,
             "text": self.text if not self.title else f"*{self.title}*\n{text}",
         }
+
+
+class StaticSelectOption:
+    def __init__(self, text, value):
+        self.text = text
+        self.value = value
+
+    def serialize(self):
+        return {
+            "text": {"type": "plain_text", "emoji": True, "text": self.text},
+            "value": self.value,
+        }
+
+
+class StaticSelect:
+    def __init__(self, options, action_id, placeholder_text=None):
+        self.options = options
+        self.placeholder_text = placeholder_text
+        self.action_id = action_id
+
+    def serialize(self):
+        serialized = {
+            "type": "static_select",
+            "action_id": self.action_id,
+            "options": [o.serialize() for o in self.options],
+        }
+
+        if self.placeholder_text:
+            serialized["placeholder"] = {
+                "type": "plain_text",
+                "emoji": True,
+                "text": self.placeholder_text,
+            }
+
+        return serialized

response/slack/decorators/action_handler.py

@@ -11,13 +11,11 @@
 
 
 class ActionContext:
-    def __init__(
-        self, incident, user_id, message, button_value, trigger_id, response_url
-    ):
+    def __init__(self, incident, user_id, message, value, trigger_id, response_url):
         self.incident = incident
         self.user_id = user_id
         self.message = message
-        self.button_value = button_value
+        self.value = value
         self.trigger_id = trigger_id
         self.response_url = response_url
 
@@ -39,8 +37,10 @@ def remove_action_handler(callback_id):
 @after_response.enable
 def handle_action(payload):
     actions = payload["actions"]
+
     if actions:
-        action_id = actions[0]["action_id"]
+        action = actions[0]
+        action_id = action["action_id"]
 
         if action_id not in SLACK_ACTION_MAPPINGS:
             logger.error(f"Can't find handler for action id {action_id}")
@@ -50,19 +50,27 @@ def handle_action(payload):
 
         user_id = payload["user"]["id"]
         channel_id = payload["channel"]["id"]
-        button_value = actions[0]["value"]
         message = payload["message"]
         trigger_id = payload["trigger_id"]
         response_url = payload["response_url"]
 
+        action_type = action["type"]
+        if action_type == "button":
+            value = action["value"]
+        elif action_type == "static_select":
+            value = action["selected_option"]["value"]
+        else:
+            logger.error(f"Can't handle action with type {action_type}")
+            return
+
         # we want to tie all actions to an incident, and have two ways to do this:
         # - if action comes from a comms channel, lookup the incident by comms channel id
         # - if not in comms channel, we rely on the button value containing the incident id
         try:
             comms_channel = CommsChannel.objects.get(channel_id=channel_id)
             incident = comms_channel.incident
         except CommsChannel.DoesNotExist:
-            incident_id = button_value
+            incident_id = value
             incident = Incident.objects.get(pk=incident_id)
         except Incident.DoesNotExist:
             logger.error(
@@ -74,7 +82,7 @@ def handle_action(payload):
             incident=incident,
             user_id=user_id,
             message=message,
-            button_value=button_value,
+            value=value,
             trigger_id=trigger_id,
             response_url=response_url,
         )