Merge pull request TwilioDevEd#963 from TwilioDevEd/serverless-cookies-state

feat: add code snippets for serverless cookie state examples

Author: stern-shawn

serverless/examples/cookies/state-long/meta.json

@@ -0,0 +1,5 @@
+{
+    "title": "Add counter state to an SMS response that persists for four hours",
+    "type": "server"
+}
+  

serverless/examples/cookies/state-long/state-long-function.js

@@ -0,0 +1,36 @@
+exports.handler = (context, event, callback) => {
+  // Initialize a new Response and some TwiML
+  const response = new Twilio.Response();
+  const twiml = new Twilio.twiml.MessagingResponse();
+
+  // Cookies are accessed by name from the event.request.cookies object
+  // If the user doesn't have a count yet, initialize it to zero. Cookies are
+  // always strings, so you'll need to convert the count to a number
+  const count = Number(event.request.cookies.count) || 0;
+
+  // Return a dynamic message based on if this is the first message or not
+  const message =
+    count > 0
+      ? `Your current count is ${count}`
+      : 'Hello, thanks for the new message!';
+
+  twiml.message(message);
+
+  response
+    // Add the stringified TwiML to the response body
+    .setBody(twiml.toString())
+    // Since we're returning TwiML, the content type must be XML
+    .appendHeader('Content-Type', 'text/xml')
+    // You can increment the count state for the next message, or any other
+    // operation that makes sense for your application's needs. Use the
+    // third argument of setCookie to set cookie attributes, such as making
+    // count last for the max of 4 hours instead of the default 1 hour
+    .setCookie('count', (count + 1).toString(), [
+      'HttpOnly',
+      'Secure',
+      'SameSite=Strict',
+      'Max-Age=14400',
+    ]);
+
+  return callback(null, response);
+};

serverless/examples/cookies/state/meta.json

@@ -0,0 +1,5 @@
+{
+    "title": "Add counter state to an SMS response",
+    "type": "server"
+}
+  

serverless/examples/cookies/state/state-function.js

@@ -0,0 +1,30 @@
+exports.handler = (context, event, callback) => {
+  // Initialize a new Response and some TwiML
+  const response = new Twilio.Response();
+  const twiml = new Twilio.twiml.MessagingResponse();
+
+  // Cookies are accessed by name from the event.request.cookies object
+  // If the user doesn't have a count yet, initialize it to zero. Cookies are
+  // always strings, so you'll need to convert the count to a number
+  const count = Number(event.request.cookies.count) || 0;
+
+  // Return a dynamic message based on if this is the first message or not
+  const message =
+    count > 0
+      ? `Your current count is ${count}`
+      : 'Hello, thanks for the new message!';
+
+  twiml.message(message);
+
+  response
+    // Add the stringified TwiML to the response body
+    .setBody(twiml.toString())
+    // Since we're returning TwiML, the content type must be XML
+    .appendHeader('Content-Type', 'text/xml')
+    // You can increment the count state for the next message, or any other
+    // operation that makes sense for your application's needs. Remember
+    // that cookies are always stored as strings
+    .setCookie('count', (count + 1).toString());
+
+  return callback(null, response);
+};