TwilioSmsSender.cs

using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
using Twilio.Clients;
using Twilio.Rest.Api.V2010.Account;
using Twilio.Types;

namespace Pact.Sms;

/// <summary>
/// An SMS &amp; Voice service implementation using Twilio (https://www.twilio.com/)
/// For docs on implementing the voice endpoint, refer to: https://www.twilio.com/docs/voice/tutorials/how-to-respond-to-incoming-phone-calls-csharp
/// </summary>
public class TwilioSmsSender : ISmsSender
{
    private readonly ILogger<TwilioSmsSender> _logger;
    private readonly ITwilioRestClient _twilio;
    private readonly SmsSettings _settings;

    public TwilioSmsSender(IOptions<SmsSettings> smsSettings,
        ILogger<TwilioSmsSender> logger,
        ITwilioRestClient twilio)
    {
        _settings = smsSettings.Value;
        _twilio = twilio;
        _logger = logger;
    }
        
    ///<inheritdoc/>
    public bool SupportsVoice => true;

    ///<inheritdoc/>
    public async Task SendVoiceAsync(string number, string callbackUrl)
    {
        _logger.LogInformation("> Voice Sending => {Number}, {CallbackUrl}", number, callbackUrl);

        var to = new PhoneNumber(number);
        var from = new PhoneNumber(_settings.From);

        var call = await CallResource.CreateAsync(to, from, url: new Uri(callbackUrl), client: _twilio).ConfigureAwait(false);

        _logger.LogInformation(">> Voice Sent => {Number}, {CallbackUrl}, {Sid}", number, callbackUrl, call?.Sid);
    }

    ///<inheritdoc/>
    public async Task SendSmsAsync(string number, string message)
    {
        _logger.LogInformation("> Sms Sending => {Number}, {Message}", number, message);

        var to = new PhoneNumber(number);
        var from = new PhoneNumber(_settings.From);

        await MessageResource.CreateAsync(to, from: from, body: message, client: _twilio).ConfigureAwait(false);

        _logger.LogInformation(">> Sms Sent => {Number}, {Message}", number, message);
    }
}