Add canfullfill intent in response builder, corresponding models in d…

…ocs (#42)

Fixes #29

README.rst

@@ -245,6 +245,8 @@ Preview
 
 * `Alexa Presentation Language <https://developer.amazon.com/docs/alexa-presentation-language/apl-overview.html>`__
 
+* `Name-free Interactions <https://developer.amazon.com/docs/custom-skills/understand-name-free-interaction-for-custom-skills.html>`_
+
 
 Got Feedback?
 -------------

ask-sdk-core/ask_sdk_core/response_helper.py

@@ -26,6 +26,7 @@
     from typing import Union
     from ask_sdk_model import Directive
     from ask_sdk_model.ui import Card
+    from ask_sdk_model.canfulfill import CanFulfillIntent
 
 
 PLAIN_TEXT_TYPE = "PlainText"
@@ -47,7 +48,8 @@ def __init__(self):
         """
         self.response = Response(
             output_speech=None, card=None, reprompt=None,
-            directives=None, should_end_session=None)
+            directives=None, should_end_session=None,
+            can_fulfill_intent=None)
 
     def speak(self, speech):
         # type: (str) -> 'ResponseFactory'
@@ -136,6 +138,22 @@ def set_should_end_session(self, should_end_session):
             self.response.should_end_session = should_end_session
         return self
 
+    def set_can_fulfill_intent(self, can_fulfill_intent):
+        # type: (CanFulfillIntent) -> 'ResponseFactory'
+        """Sets CanFulfill intent to the response.
+
+        For more information on CanFulfillIntent, check the name-free
+        interaction doc here: https://developer.amazon.com/docs/custom-skills/understand-name-free-interaction-for-custom-skills.html
+
+        :param can_fulfill_intent: CanFulfill Intent sent back in response.
+        :type can_fulfill_intent: CanFulfillIntent
+        :return: response factory with partial response being built and
+            access from self.response.
+        :rtype: ResponseFactory
+        """
+        self.response.can_fulfill_intent = can_fulfill_intent
+        return self
+
     def __trim_outputspeech(self, speech_output=None):
         # type: (Union[str, None]) -> str
         """Trims the output speech if it already has the

ask-sdk-core/tests/unit/test_response_helper.py

@@ -23,6 +23,9 @@
 from ask_sdk_model.interfaces.display import TextContent
 from ask_sdk_model.interfaces.display import PlainText
 from ask_sdk_model.interfaces.display import RichText
+from ask_sdk_model.canfulfill import (
+    CanFulfillIntent, CanFulfillIntentValues, CanFulfillSlot,
+    CanFulfillSlotValues, CanUnderstandSlotValues)
 
 from ask_sdk_core.response_helper import (
     ResponseFactory, get_text_content, get_plain_text_content,
@@ -131,6 +134,23 @@ def test_trim_outputspeech(self):
             speech=speech_output4).response.output_speech.ssml == "<speak>Hello World</speak>", (
             "The trim_outputspeech method fails to trim the outputspeech")
 
+    def test_set_can_fulfill_intent(self):
+        intent = CanFulfillIntent(
+            can_fulfill=CanFulfillIntentValues.MAYBE,
+            slots={
+                "testSlot": CanFulfillSlot(
+                    can_understand=CanUnderstandSlotValues.YES,
+                    can_fulfill=CanFulfillSlotValues.YES
+                )
+            }
+        )
+        response_factory = self.response_factory.set_can_fulfill_intent(
+            can_fulfill_intent=intent)
+
+        assert response_factory.response.can_fulfill_intent == intent, (
+            "The set_can_fulfill_intent method of ResponseFactory fails to "
+            "set can_fulfill_intent value")
+
 
 class TestTextHelper(unittest.TestCase):
     def test_build_primary_text_default(self):

docs/en/SDK_SUPPORTED_ALEXA_CAPABILITIES.rst

@@ -50,3 +50,5 @@ Preview
 * `Connections <https://developer.amazon.com/blogs/alexa/post/7b332b32-893e-4cad-be07-a5877efcbbb4/skill-connections-preview-now-skills-can-work-together-to-help-customers-get-more-done>`__
 
 * `Alexa Presentation Language <https://developer.amazon.com/docs/alexa-presentation-language/apl-overview.html>`__
+
+* `Name-free Interactions <https://developer.amazon.com/docs/custom-skills/understand-name-free-interaction-for-custom-skills.html>`_

docs/en/models/ask_sdk_model.canfulfill.rst

@@ -0,0 +1,57 @@
+ask_sdk_model.canfulfill package
+================================
+
+Submodules
+----------
+
+.. note::
+
+    Canonical imports have been added in the ``__init__.py`` of the package.
+    This helps in importing the class directly from the package, than
+    through the module.
+
+    For eg: if ``package a`` has ``module b`` with
+    ``class C``, you can do ``from a import C`` instead of
+    ``from a.b import C``.
+
+ask\_sdk\_model.canfulfill.can\_fulfill\_intent module
+------------------------------------------------------
+
+.. automodule:: ask_sdk_model.canfulfill.can_fulfill_intent
+    :members:
+    :show-inheritance:
+
+ask\_sdk\_model.canfulfill.can\_fulfill\_intent\_request module
+---------------------------------------------------------------
+
+.. automodule:: ask_sdk_model.canfulfill.can_fulfill_intent_request
+    :members:
+    :show-inheritance:
+
+ask\_sdk\_model.canfulfill.can\_fulfill\_intent\_values module
+--------------------------------------------------------------
+
+.. automodule:: ask_sdk_model.canfulfill.can_fulfill_intent_values
+    :members:
+    :show-inheritance:
+
+ask\_sdk\_model.canfulfill.can\_fulfill\_slot module
+----------------------------------------------------
+
+.. automodule:: ask_sdk_model.canfulfill.can_fulfill_slot
+    :members:
+    :show-inheritance:
+
+ask\_sdk\_model.canfulfill.can\_fulfill\_slot\_values module
+------------------------------------------------------------
+
+.. automodule:: ask_sdk_model.canfulfill.can_fulfill_slot_values
+    :members:
+    :show-inheritance:
+
+ask\_sdk\_model.canfulfill.can\_understand\_slot\_values module
+---------------------------------------------------------------
+
+.. automodule:: ask_sdk_model.canfulfill.can_understand_slot_values
+    :members:
+    :show-inheritance:

docs/en/models/ask_sdk_model.rst

@@ -13,6 +13,7 @@ Subpackages
 .. toctree::
   :maxdepth: 1
 
+  ask_sdk_model.canfulfill
   ask_sdk_model.dialog
   ask_sdk_model.events
   ask_sdk_model.interfaces