docs: added webhook sample (#876)

Author: galz10

dialogflow/system-test/webhook.test.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
+//
+//      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('../webhook');
+
+const request = {
+  body: {
+    queryResult: {
+      intent: {
+        name: 'projects/galstarter-316823/agent/intents/00c2877d-2440-447f-8dc1-045623a55bd4',
+        displayName: 'Default Welcome Intent',
+      },
+    },
+  },
+};
+
+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/webhook.js

@@ -0,0 +1,64 @@
+// 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_es_webhook]
+
+exports.handleWebhook = (request, response) => {
+  const tag = request.body.queryResult.intent.displayName;
+
+  let jsonResponse = {};
+  if (tag === 'Default Welcome Intent') {
+    //fulfillment response to be sent to the agent if the request tag is equal to "welcome tag"
+    jsonResponse = {
+      fulfillment_messages: [
+        {
+          text: {
+            //fulfillment text response to be sent to the agent
+            text: ['Hello from a GCF Webhook'],
+          },
+        },
+      ],
+    };
+  } else if (tag === 'get-name') {
+    //fulfillment response to be sent to the agent if the request tag is equal to "welcome tag"
+    jsonResponse = {
+      fulfillment_messages: [
+        {
+          text: {
+            //fulfillment text response to be sent to the agent
+            text: ['My name is Flowhook'],
+          },
+        },
+      ],
+    };
+  } else {
+    jsonResponse = {
+      //fulfillment text response to be sent to the agent if there are no defined responses for the specified tag
+      fulfillment_messages: [
+        {
+          text: {
+            ////fulfillment text response to be sent to the agent
+            text: [
+              `There are no fulfillment responses defined for "${tag}"" tag`,
+            ],
+          },
+        },
+      ],
+    };
+  }
+  response.send(jsonResponse);
+};
+// [END dialogflow_es_webhook]