Update relay-sms.protected.js

masked-number/functions/relay-sms.protected.js

@@ -1,38 +1,100 @@
+/*
+ * Masking your phone number for SMS Forwarding and Responding
+ *
+ * Description:
+ * This function acts as a message-forwarding service 
+ * If the message comes from the user, it forwards the message to another number. 
+ * If it comes from someone else, it forwards it to the user.
+ *
+ * Contents:
+ * 1. Initialize Client and Response
+ * 2. Sender Check
+ * 3. Extracting Recipient and Message
+ * 4. Sending the Message
+ * 5. Handling Messages from Other Senders
+ */
+
+/*
+ * 1. Initialize client and response 
+ *
+ * Here you can initialize a Twilio client (client) to interact with Twilio's API.
+ *
+ * A twiml object is created to generate TwiML (Twilio Markup Language) responses, 
+ * which are instructions that tell Twilio how to respond to an incoming message.
+ */
+
+// Defines the main function handler for the Twilio Function.
 exports.handler = async function (context, event, callback) {
   const client = context.getTwilioClient();
   const twiml = new Twilio.twiml.MessagingResponse();
 
+/*
+ * 2. Checking the Sender 
+ *
+ * Here you can checks if the message came from a specific number. 
+ * This condition ensures that only the user with this phone number can send outgoing messages.
+ */
   if (event.From === context.MY_PHONE_NUMBER) {
+    // Looks for a : in the message body to separate the recipient's phone number from the message text.
     const separatorPosition = event.Body.indexOf(':');
 
+    // If there is no :, a response is sent to the sender with a message explaining the required format: recipientPhoneNumber: message.
     if (separatorPosition < 1) {
       twiml.message(
         'You need to specify a recipient number and a ":" before the message. For example, "+12223334444: message".'
       );
+
+  /*
+   * 3. Extracting Recipient and Message
+   * 
+   * Here you can processes the incoming message body 
+   * to extract the recipient's phone number and the actual message content
+   */
+
     } else {
+      // Extracts the recipient's phone number from the part of the message before the : and removes any extra whitespace.
       const recipientNumber = event.Body.substr(0, separatorPosition).trim();
+
+      // Extracts the actual message from the part of the message after the :.
       const messageBody = event.Body.substr(separatorPosition + 1).trim();
 
+   /*
+   * 4. Sending the Message
+   * 
+   * Here a try-catch block attempts to send an SMS message using the Twilio API
+   */     
       try {
+        // Sends the SMS to recipientNumber with the message messageBody.
         await client.messages.create({
           to: recipientNumber,
           from: event.To,
           body: messageBody,
         });
 
+        // If successful, callback(null) is called to signal that the function executed successfully without returning any TwiML.
         return callback(null);
+
+      // If there is an error (e.g., an invalid phone number), a failure message is sent to the sender explaining that the phone number might be incorrect.
       } catch (err) {
         twiml.message(
           'There was an issue with the phone number you entered; please verify it is correct and try again.'
         );
       }
     }
-  } else {
+  }
+
+/*
+ * 5. Handling Messages from Other Senders
+ * 
+ * If the message is not from context.MY_PHONE_NUMBER, 
+ * the function forwards it to the number stored in context.MY_PHONE_NUMBER, 
+ */
+  else {
     twiml.message(
       { to: context.MY_PHONE_NUMBER },
       `${event.From}: ${event.Body}`
     );
   }
-
+  // Sends the generated TwiML response back to Twilio, which in turn sends it as an SMS response to the original sender.
   return callback(null, twiml);
 };