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MailgunSender.cs
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MailgunSender.cs
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using FluentEmail.Core;
using FluentEmail.Core.Interfaces;
using FluentEmail.Core.Models;
using FluentEmail.Mailgun.HttpHelpers;
using Newtonsoft.Json;
namespace FluentEmail.Mailgun
{
public class MailgunSender : IMailgunSender
{
private readonly string _apiKey;
private readonly string _domainName;
private HttpClient _httpClient;
public MailgunSender(string domainName, string apiKey, MailGunRegion mailGunRegion = MailGunRegion.USA)
{
_domainName = domainName;
_apiKey = apiKey;
string url = string.Empty;
switch(mailGunRegion)
{
case MailGunRegion.USA:
url = $"https://api.mailgun.net/v3/{_domainName}/";
break;
case MailGunRegion.EU:
url = $"https://api.eu.mailgun.net/v3/{_domainName}/";
break;
default:
throw new ArgumentException($"'{mailGunRegion}' is not a valid value for {nameof(mailGunRegion)}");
}
_httpClient = new HttpClient
{
BaseAddress = new Uri(url)
};
_httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Basic", Convert.ToBase64String(Encoding.ASCII.GetBytes($"api:{_apiKey}")));
}
public SendResponse Send(IFluentEmail email, CancellationToken? token = null)
{
return SendAsync(email, token).GetAwaiter().GetResult();
}
public async Task<SendResponse> SendAsync(IFluentEmail email, CancellationToken? token = null)
{
var parameters = BuildMailgunParameters(email);
parameters.Add(new KeyValuePair<string, string>(email.Data.IsHtml ? "html" : "text", email.Data.Body));
if (!string.IsNullOrEmpty(email.Data.PlaintextAlternativeBody))
{
parameters.Add(new KeyValuePair<string, string>("text", email.Data.PlaintextAlternativeBody));
}
var files = BuildMailgunFiles(email);
return await SendAsync(parameters, files, token);
}
private async Task<SendResponse> SendAsync(List<KeyValuePair<string, string>> parameters, List<HttpFile> files, CancellationToken? token = null)
{
token?.ThrowIfCancellationRequested();
var response = await _httpClient.PostMultipart<MailgunResponse>("messages", parameters, files)
.ConfigureAwait(false);
var result = new SendResponse {MessageId = response.Data?.Id};
if (!response.Success)
{
result.ErrorMessages.AddRange(response.Errors.Select(x => x.ErrorMessage));
return result;
}
return result;
}
private static List<HttpFile> BuildMailgunFiles(IFluentEmail email)
{
var files = new List<HttpFile>();
email.Data.Attachments.ForEach(x =>
{
string param;
if (x.IsInline)
param = "inline";
else
param = "attachment";
files.Add(new HttpFile
{
ParameterName = param,
Data = x.Data,
Filename = x.Filename,
ContentType = x.ContentType
});
});
return files;
}
private static List<KeyValuePair<string, string>> BuildMailgunParameters(IFluentEmail email)
{
var parameters = new List<KeyValuePair<string, string>>();
parameters.Add(new KeyValuePair<string, string>("from",
$"{email.Data.FromAddress.Name} <{email.Data.FromAddress.EmailAddress}>"));
email.Data.ToAddresses.ForEach(x =>
{
parameters.Add(new KeyValuePair<string, string>("to", $"{x.Name} <{x.EmailAddress}>"));
});
email.Data.CcAddresses.ForEach(x =>
{
parameters.Add(new KeyValuePair<string, string>("cc", $"{x.Name} <{x.EmailAddress}>"));
});
email.Data.BccAddresses.ForEach(x =>
{
parameters.Add(new KeyValuePair<string, string>("bcc", $"{x.Name} <{x.EmailAddress}>"));
});
email.Data.ReplyToAddresses.ForEach(x =>
{
parameters.Add(new KeyValuePair<string, string>("h:Reply-To", $"{x.Name} <{x.EmailAddress}>"));
});
parameters.Add(new KeyValuePair<string, string>("subject", email.Data.Subject));
email.Data.Tags.ForEach(x => { parameters.Add(new KeyValuePair<string, string>("o:tag", x)); });
foreach (var emailHeader in email.Data.Headers)
{
var key = emailHeader.Key;
if (!key.StartsWith("h:"))
{
key = "h:" + emailHeader.Key;
}
parameters.Add(new KeyValuePair<string, string>(key, emailHeader.Value));
}
return parameters;
}
public async Task<SendResponse> SendWithTemplateAsync(IFluentEmail email, string templateName, object templateData,
CancellationToken? token = null)
{
var parameters = BuildMailgunParameters(email);
var files = BuildMailgunFiles(email);
parameters.Add(new KeyValuePair<string, string>("template", templateName));
parameters.Add(new KeyValuePair<string, string>("h:X-Mailgun-Variables", JsonConvert.SerializeObject(templateData)));
return await SendAsync(parameters, files, token);
}
}
}