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Add support for inline images for MailKit #360

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Add support for inline images for MailKit #360

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14 changes: 12 additions & 2 deletions src/Senders/FluentEmail.MailKit/MailKitSender.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -219,8 +219,18 @@ private MimeMessage CreateMailMessage(IFluentEmail email)

data.Attachments.ForEach(x =>
{
var attachment = builder.Attachments.Add(x.Filename, x.Data, ContentType.Parse(x.ContentType));
attachment.ContentId = x.ContentId;
var contentType = ContentType.Parse(x.ContentType);

if (x.IsInline)
{
var attachment = builder.LinkedResources.Add(x.Filename, x.Data, contentType);
attachment.ContentId = x.ContentId ?? x.Filename;
}
else
{
var attachment = builder.Attachments.Add(x.Filename, x.Data, contentType);
attachment.ContentId = x.ContentId;
}
});


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75 changes: 75 additions & 0 deletions test/FluentEmail.Core.Tests/MailKitSmtpSenderTests.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -92,6 +92,81 @@ public async Task CanSendEmailWithAttachments()
Assert.IsNotEmpty(files);
}

[Test]
[TestCase]
[TestCase("logotest.png")]
public async Task CanSendEmailWithInlineImages(string contentId = null)
{
using (var stream = File.OpenRead($"{Path.Combine(Directory.GetCurrentDirectory(), "logotest.png")}"))
{
var attachment = new Attachment
{
IsInline = true,
Data = stream,
ContentType = "image/png",
Filename = "logotest.png",
ContentId = contentId
};

var email = Email
.From(fromEmail)
.To(toEmail)
.Subject(subject)
.Body("<html>Inline image here: <img src=\"cid:logotest.png\">" +
"<p>You should see an image without an attachment, or without a download prompt, depending on the email client.</p></html>", true)
.Attach(attachment);

var response = await email.SendAsync();

var files = Directory.EnumerateFiles(tempDirectory, "*.eml");
Assert.IsTrue(response.Successful);
Assert.IsNotEmpty(files);
}
}

[Test]
public async Task CanSendEmailWithInlineImagesAndAttachmentTogether()
{
var attachmentStream = new MemoryStream();
var sw = new StreamWriter(attachmentStream);
sw.WriteLine("Hey this is some text in an attachment");
sw.Flush();
attachmentStream.Seek(0, SeekOrigin.Begin);

var attachment = new Attachment
{
Data = attachmentStream,
ContentType = "text/plain",
Filename = "MailKitAttachment.txt",
};

using var inlineStream = File.OpenRead($"{Path.Combine(Directory.GetCurrentDirectory(), "logotest.png")}");

var attachmentInline = new Attachment
{
IsInline = true,
Data = inlineStream,
ContentType = "image/png",
Filename = "logotest.png",
};

var email = Email
.From(fromEmail)
.To(toEmail)
.Subject(subject)
.Body("<html>Inline image here: <img src=\"cid:logotest.png\">" +
"<p>You should see an image inline without a picture attachment.</p>" +
"<p>A single .txt file should also be attached.</p></html>", true)
.Attach(attachment)
.Attach(attachmentInline);

var response = await email.SendAsync();

var files = Directory.EnumerateFiles(tempDirectory, "*.eml");
Assert.IsTrue(response.Successful);
Assert.IsNotEmpty(files);
}

[Test]
public async Task CanSendAsyncHtmlAndPlaintextTogether()
{
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