docs(samples): Adds snippet for validating a form parameter. (#302)

Author: nicain

Dialogflow-CX/webhook_validate_form_parameter.py

@@ -0,0 +1,71 @@
+# Copyright 2021, Google LLC
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
+""" DialogFlow CX: webhook to validate or invalidate form parameters snippet."""
+
+# [START dialogflow_v3beta1_webhook_validate_form_parameter]
+
+# TODO (developer): change entry point to validate_parameter in Cloud Function
+
+
+def validate_parameter(request):
+    """# Webhook to validate or invalidate parameter based on conditions configured by the user."""
+
+    request_dict = request.get_json()
+    param_to_validate = request_dict["pageInfo"]["formInfo"]["parameterInfo"][0][
+        "value"
+    ]
+
+    if param_to_validate > 15:
+        text = "That is too many! Please pick another number."
+        param_state = "INVALID"
+    else:
+        text = "That is a number I can work with!"
+        param_state = "VALID"
+
+    json_response = {
+        "fulfillment_response": {
+            "messages": [
+                {
+                    "text": {
+                        "text": [
+                            text
+                        ],  # fulfillment text response to be sent to the agent
+                    },
+                },
+            ],
+        },
+        "page_info": {
+            "form_info": {
+                "parameter_info": [
+                    {
+                        "displayName": "paramToValidate",
+                        "required": True,
+                        "state": param_state,
+                    },
+                ],
+            },
+        },
+        "sessionInfo": {
+            "parameters": {
+                # Set session parameter to null if your agent needs to reprompt the user
+                "paramToValidate": None
+            },
+        },
+    }
+
+    return json_response
+
+
+# [END dialogflow_v3beta1_webhook_validate_form_parameter]

Dialogflow-CX/webhook_validate_form_parameter_test.py

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+# Copyright 2021, Google LLC
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Test webhook"""
+
+import flask
+import pytest
+
+from webhook_validate_form_parameter import validate_parameter
+
+
+@pytest.fixture(name="app", scope="module")
+def fixture_app():
+    """Flask fixture to pass a flask.Request to the test function"""
+    return flask.Flask(__name__)
+
+
+@pytest.mark.parametrize(
+    "value,expected_response",
+    [
+        (15, "That is a number I can work with!"),
+        (16, "That is too many! Please pick another number."),
+    ],
+)
+def test_validate_parameter(value, expected_response, app):
+    """Parameterized test for validate form parameter webhook snippet."""
+
+    request = {"pageInfo": {"formInfo": {"parameterInfo": [{"value": value}]}}}
+
+    with app.test_request_context(json=request):
+        res = validate_parameter(flask.request)
+        assert (
+            res["fulfillment_response"]["messages"][0]["text"]["text"][0]
+            == expected_response
+        )