Add support for supportedOperations to Alexa.PlaybackController (#28212)

* Added support for supportedOperations to Alexa.PlaybackController

* Added support for supportedOperations to Alexa.PlaybackController

homeassistant/components/alexa/capabilities.py

@@ -17,6 +17,7 @@ from homeassistant.const import (
     STATE_UNKNOWN,
 )
 import homeassistant.components.climate.const as climate
+import homeassistant.components.media_player.const as media_player
 from homeassistant.components.alarm_control_panel import ATTR_CODE_FORMAT, FORMAT_NUMBER
 from homeassistant.components import light, fan, cover
 import homeassistant.util.color as color_util
@@ -110,6 +111,11 @@ class AlexaCapability:
         """Return the Configuration object."""
         return []
 
+    @staticmethod
+    def supported_operations():
+        """Return the supportedOperations object."""
+        return []
+
     def serialize_discovery(self):
         """Serialize according to the Discovery API."""
         result = {"type": "AlexaInterface", "interface": self.name(), "version": "3"}
@@ -150,6 +156,10 @@ class AlexaCapability:
         if instance is not None:
             result["instance"] = instance
 
+        supported_operations = self.supported_operations()
+        if supported_operations:
+            result["supportedOperations"] = supported_operations
+
         return result
 
     def serialize_properties(self):
@@ -484,6 +494,28 @@ class AlexaPlaybackController(AlexaCapability):
         """Return the Alexa API name of this interface."""
         return "Alexa.PlaybackController"
 
+    def supported_operations(self):
+        """Return the supportedOperations object.
+
+        Supported Operations: FastForward, Next, Pause, Play, Previous, Rewind, StartOver, Stop
+        """
+        supported_features = self.entity.attributes.get(ATTR_SUPPORTED_FEATURES, 0)
+
+        operations = {
+            media_player.SUPPORT_NEXT_TRACK: "Next",
+            media_player.SUPPORT_PAUSE: "Pause",
+            media_player.SUPPORT_PLAY: "Play",
+            media_player.SUPPORT_PREVIOUS_TRACK: "Previous",
+            media_player.SUPPORT_STOP: "Stop",
+        }
+
+        supported_operations = []
+        for operation in operations:
+            if operation & supported_features:
+                supported_operations.append(operations[operation])
+
+        return supported_operations
+
 
 class AlexaInputController(AlexaCapability):
     """Implements Alexa.InputController.

tests/components/alexa/test_smart_home.py

@@ -726,7 +726,7 @@ async def test_media_player(hass):
     assert appliance["displayCategories"][0] == "TV"
     assert appliance["friendlyName"] == "Test media player"
 
-    assert_endpoint_capabilities(
+    capabilities = assert_endpoint_capabilities(
         appliance,
         "Alexa.InputController",
         "Alexa.PowerController",
@@ -737,6 +737,13 @@ async def test_media_player(hass):
         "Alexa.ChannelController",
     )
 
+    playback_capability = get_capability(capabilities, "Alexa.PlaybackController")
+    assert playback_capability is not None
+    supported_operations = playback_capability["supportedOperations"]
+    operations = ["Play", "Pause", "Stop", "Next", "Previous"]
+    for operation in operations:
+        assert operation in supported_operations
+
     await assert_power_controller_works(
         "media_player#test", "media_player.turn_on", "media_player.turn_off", hass
     )