docs: add webhook code sample (#177)

* docs: add webhook code sample

* update json data

* fixed failing test

* fixed test naming

* converted response to string

* removed convert to str

* moved response object

* lint fix

* 🦉 Updates from OwlBot

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

* Added link to linkinator

* update test

* revised code

* lint fix

* lint fix

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>
Co-authored-by: Justin Beckwith <justin.beckwith@gmail.com>

dialogflow-cx/test/webhook.test.js

@@ -0,0 +1,45 @@
+// 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.
+
+'use strict';
+
+const {assert} = require('chai');
+const {describe, it} = require('mocha');
+const webhook = require('../webhooks');
+
+const request = {
+  body: {
+    fulfillmentInfo: {
+      tag: 'Default Welcome Intent',
+    },
+    text: 'hi',
+    languageCode: 'en',
+  },
+};
+
+describe('create agent', () => {
+  it('should test webhook returns correct response', async () => {
+    const temp = JSON.stringify(request);
+    let response = '';
+
+    const res = {
+      send: function (s) {
+        response = JSON.stringify(s);
+      },
+    };
+
+    webhook.handleWebhook(JSON.parse(temp), res);
+    assert.include(response, 'Hello from a GCF Webhook');
+  });
+});

dialogflow-cx/webhooks.js

@@ -0,0 +1,46 @@
+// 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
+//
+//     https://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.
+
+'use strict';
+
+// [START dialogflow_cx_webhook]
+
+exports.handleWebhook = (request, response) => {
+  const tag = request.body.fulfillmentInfo.tag;
+  let text = '';
+
+  if (tag === 'Default Welcome Intent') {
+    text = 'Hello from a GCF Webhook';
+  } else if (tag === 'get-name') {
+    text = 'My name is Flowhook';
+  } else {
+    text = `There are no fulfillment responses defined for "${tag}"" tag`;
+  }
+
+  const jsonResponse = {
+    fulfillment_response: {
+      messages: [
+        {
+          text: {
+            //fulfillment text response to be sent to the agent
+            text: [text],
+          },
+        },
+      ],
+    },
+  };
+
+  response.send(jsonResponse);
+};
+// [END dialogflow_cx_webhook]