Twilio binding for Azure Functions

The following example shows a C# function that sends a text message when triggered by a queue message.

using Microsoft.Azure.WebJobs;
using Microsoft.Extensions.Logging;
using Newtonsoft.Json.Linq;
using Twilio.Rest.Api.V2010.Account;
using Twilio.Types;
namespace TwilioQueueOutput
{
    public static class QueueTwilio
    {
        [FunctionName("QueueTwilio")]
        [return: TwilioSms(AccountSidSetting = "TwilioAccountSid", AuthTokenSetting = "TwilioAuthToken", From = "+1425XXXXXXX")]
        public static CreateMessageOptions Run(
        [QueueTrigger("myqueue-items", Connection = "AzureWebJobsStorage")] JObject order,
        ILogger log)
        {
            log.LogInformation($"C# Queue trigger function processed: {order}");

            var message = new CreateMessageOptions(new PhoneNumber(order["mobileNumber"].ToString()))
            {
                Body = $"Hello {order["name"]}, thanks for your order!"
            };

            return message;
        }
    }
}

This example uses the TwilioSms attribute with the method return value. An alternative is to use the attribute with an out CreateMessageOptions parameter or an ICollector<CreateMessageOptions> or IAsyncCollector<CreateMessageOptions> parameter.

The following example shows a Twilio output binding in a function.json file and a C# script function that uses the binding. The function uses an out parameter to send a text message.

Here's binding data in the function.json file:

Example function.json:

{
  "type": "twilioSms",
  "name": "message",
  "accountSidSetting": "TwilioAccountSid",
  "authTokenSetting": "TwilioAuthToken",
  "from": "+1425XXXXXXX",
  "direction": "out",
  "body": "Azure Functions Testing"
}

Here's C# script code:

#r "Newtonsoft.Json"
#r "Twilio"
#r "Microsoft.Azure.WebJobs.Extensions.Twilio"

using System;
using Microsoft.Extensions.Logging;
using Newtonsoft.Json;
using Microsoft.Azure.WebJobs.Extensions.Twilio;
using Twilio.Rest.Api.V2010.Account;
using Twilio.Types;

public static void Run(string myQueueItem, out CreateMessageOptions message,  ILogger log)
{
    log.LogInformation($"C# Queue trigger function processed: {myQueueItem}");

    // In this example the queue item is a JSON string representing an order that contains the name of a
    // customer and a mobile number to send text updates to.
    dynamic order = JsonConvert.DeserializeObject(myQueueItem);
    string msg = "Hello " + order.name + ", thank you for your order.";

    // You must initialize the CreateMessageOptions variable with the "To" phone number.
    message = new CreateMessageOptions(new PhoneNumber("+1704XXXXXXX"));

    // A dynamic message can be set instead of the body in the output binding. In this example, we use
    // the order information to personalize a text message.
    message.Body = msg;
}

You can't use out parameters in asynchronous code. Here's an asynchronous C# script code example:

#r "Newtonsoft.Json"
#r "Twilio"
#r "Microsoft.Azure.WebJobs.Extensions.Twilio"

using System;
using Microsoft.Extensions.Logging;
using Newtonsoft.Json;
using Microsoft.Azure.WebJobs.Extensions.Twilio;
using Twilio.Rest.Api.V2010.Account;
using Twilio.Types;

public static async Task Run(string myQueueItem, IAsyncCollector<CreateMessageOptions> message,  ILogger log)
{
    log.LogInformation($"C# Queue trigger function processed: {myQueueItem}");

    // In this example the queue item is a JSON string representing an order that contains the name of a
    // customer and a mobile number to send text updates to.
    dynamic order = JsonConvert.DeserializeObject(myQueueItem);
    string msg = "Hello " + order.name + ", thank you for your order.";

    // You must initialize the CreateMessageOptions variable with the "To" phone number.
    CreateMessageOptions smsText = new CreateMessageOptions(new PhoneNumber("+1704XXXXXXX"));

    // A dynamic message can be set instead of the body in the output binding. In this example, we use
    // the order information to personalize a text message.
    smsText.Body = msg;

    await message.AddAsync(smsText);
}

The following example shows a Twilio output binding in a function.json file and a JavaScript function that uses the binding.

Here's binding data in the function.json file:

Example function.json:

{
  "type": "twilioSms",
  "name": "message",
  "accountSidSetting": "TwilioAccountSid",
  "authTokenSetting": "TwilioAuthToken",
  "from": "+1425XXXXXXX",
  "direction": "out",
  "body": "Azure Functions Testing"
}

Here's the JavaScript code:

module.exports = function (context, myQueueItem) {
    context.log('Node.js queue trigger function processed work item', myQueueItem);

    // In this example the queue item is a JSON string representing an order that contains the name of a
    // customer and a mobile number to send text updates to.
    var msg = "Hello " + myQueueItem.name + ", thank you for your order.";

    // Even if you want to use a hard coded message in the binding, you must at least
    // initialize the message binding.
    context.bindings.message = {};

    // A dynamic message can be set instead of the body in the output binding. The "To" number 
    // must be specified in code. 
    context.bindings.message = {
        body : msg,
        to : myQueueItem.mobileNumber
    };

    context.done();
};

The following example shows how to send an SMS message using the output binding as defined in the following function.json.

    {
      "type": "twilioSms",
      "name": "twilioMessage",
      "accountSidSetting": "TwilioAccountSID",
      "authTokenSetting": "TwilioAuthToken",
      "from": "+1XXXXXXXXXX",
      "direction": "out",
      "body": "Azure Functions Testing"
    }

You can pass a serialized JSON object to the func.Out parameter to send the SMS message.

import logging
import json
import azure.functions as func

def main(req: func.HttpRequest, twilioMessage: func.Out[str]) -> func.HttpResponse:

    message = req.params.get('message')
    to = req.params.get('to')

    value = {
      "body": message,
      "to": to
    }

    twilioMessage.set(json.dumps(value))

    return func.HttpResponse(f"Message sent")

The following example shows how to use the TwilioSmsOutput annotation to send an SMS message. Values for to, from, and body are required in the attribute definition even if you override them programmatically.

package com.function;

import java.util.*;
import com.microsoft.azure.functions.annotation.*;
import com.microsoft.azure.functions.*;

public class TwilioOutput {

    @FunctionName("TwilioOutput")
    public HttpResponseMessage run(
            @HttpTrigger(name = "req", methods = { HttpMethod.GET, HttpMethod.POST },
                authLevel = AuthorizationLevel.FUNCTION) HttpRequestMessage<Optional<String>> request,
            @TwilioSmsOutput(
                name = "twilioMessage",
                accountSid = "AzureWebJobsTwilioAccountSID",
                authToken = "AzureWebJobsTwilioAuthToken",
                to = "+1XXXXXXXXXX",
                body = "From Azure Functions",
                from = "+1XXXXXXXXXX") OutputBinding<String> twilioMessage,
            final ExecutionContext context) {

        String message = request.getQueryParameters().get("message");
        String to = request.getQueryParameters().get("to");

        StringBuilder builder = new StringBuilder()
            .append("{")
            .append("\"body\": \"%s\",")
            .append("\"to\": \"%s\"")
            .append("}");

        final String body = String.format(builder.toString(), message, to);

        twilioMessage.setValue(body);

        return request.createResponseBuilder(HttpStatus.OK).body("Message sent").build();
    }
}

In C# class libraries, use the TwilioSms attribute.

For information about attribute properties that you can configure, see Configuration. Here's a TwilioSms attribute example in a method signature:

[FunctionName("QueueTwilio")]
[return: TwilioSms(AccountSidSetting = "TwilioAccountSid", AuthTokenSetting = "TwilioAuthToken", From = "+1425XXXXXXX")]
public static CreateMessageOptions Run(
[QueueTrigger("myqueue-items", Connection = "AzureWebJobsStorage")] JObject order, ILogger log)
{
    ...
}

For a complete example, see C# example.

Attributes are not supported by C# Script.

Attributes are not supported by JavaScript.

Attributes are not supported by Python.

Place TwilioSmsOutput annotation on an OutputBinding<T> parameter where T may be any native Java type such as int, String, byte[], or a POJO type.