/// <summary>
/// 对邮件内容进行签名，如果出错将返回错误
/// </summary>
public Result Sign(MailMessage message)
{
var rtv = new Result();
message.Headers.Set(DKIMTimeKeyT, DateTime.Now.ToUniversalTime().ToString("r").Replace("GMT", "+000"));
message.Headers.Remove(EMail_DKIM.DKIMTimeKeyTS);
var rawRes = EMail_DKIM_MailMessageText.ToRAW(message);
if (rawRes.IsError)
{
rawRes.errorTo(rtv);
return(rtv);
}
var signRes = Sign(rawRes.Value);
if (signRes.IsError)
{
rawRes.errorTo(rtv);
return(rtv);
}
message.Headers.Set(DKIMKey, signRes.Value);
return(rtv);
}
/// <summary>
/// 获取待签名的header
///
/// signParams="...; b="。
///
/// dkimKeyOrNull为null时会格式化signParams用于对发送邮件进行签名，如果是验证签名必须提供这个key，因为不知道源格式是什么样的字符串，而且不会对signParams做任何处理。
///
/// signHeaderNames要一起签名的header，From一定会有。
///
/// 返回内容(relaxed/simple https://service.mail.qq.com/cgi-bin/help?subtype=1&id=16&no=1001507)：
/// k:v
/// k:v
/// DKIM-Signature:...; b=
/// </summary>
public Result <string> GetSignHeader(bool relaxed, string signParams, string dkimKeyOrNull, List <string> signHeaderNames)
{
var rtv = new Result <string>();
var headVals = new List <string>();
Action <string, string> addHead = (key, val) => {
if (relaxed)
{
val = ReduceWitespace(val.Trim());
headVals.Add(key.Trim().ToLower() + ":" + val);
}
else
{
headVals.Add(key + ":" + val);
}
};
foreach (var key in signHeaderNames)
{
var val = GetHeader(key);
addHead(key, val);
}
if (dkimKeyOrNull != null)
{
addHead(dkimKeyOrNull, signParams);
}
else
{
//生成空白签名内部格式，签名专用
var msg = new MailMessage("*****@*****.**", "*****@*****.**");
msg.HeadersEncoding = Encoding.UTF8;
msg.Subject = new string('a', 1024);
msg.Body = new string('a', 1024);
msg.Headers.Add(EMail_DKIM.DKIMKey, signParams + new string('0', 70));
var rawRes = EMail_DKIM_MailMessageText.ToRAW(msg);
if (rawRes.IsError)
{
rawRes.errorTo(rtv);
return(rtv);
}
var wDkim = rawRes.Value.GetHeader(EMail_DKIM.DKIMKey);
wDkim = wDkim.Substring(0, wDkim.Length - 70);
addHead(EMail_DKIM.DKIMKey, wDkim);
}
rtv.Value = headVals.join("\r\n");
return(rtv);
}
static void EMailTest()
{
var domain = "test.localhost";
var selector = "op";
//DKIM签名私钥
var rsa = new RSA.RSA(@"
-----BEGIN RSA PRIVATE KEY-----
MIIBOwIBAAJBALYyNggDBZ2SjrnZsOolGW1UWjf5Mt6P3zmitHctuOv8TvkdAAnH
knzM8soIWXFUjQ3yTSweJ54hvX2UmDpjEe0CAwEAAQJAM7vkLbg18v03e7w9iO7J
3opyJ6yh7iJqHyJ9Hc4k0RTT69q+rTWky2NNOQjDIb7dFiN8soXSttkgxJWHpvS1
XQIhANphUALecb2vyi9fVtZsLf+IPHQQSxmaRwpszmXqvD/jAiEA1ZUp/cLuPhvL
aVGoAOpMI3+tTrAS+rD4ynS9m+pQb+8CIQDWGgQ029wNyhRi/4kGrocmeW4zqGnI
zy4JNYXh/BLWWwIgMnLhUEdS7uixy1a2UEEHavslfIiqcvyKR4f7oXBfP5ECIQDK
B4JqZMGSBWkvkoGZOoTEr5UF7/EUeZIjux3wm2wYXA==
-----END RSA PRIVATE KEY-----
", true);
Console.WriteLine("【DKIM测试公钥512位（PEM）】：");
Console.WriteLine(rsa.ToPEM_PKCS1(true));
Console.WriteLine();
var dkim = new EMail_DKIM(domain, selector, rsa);
Action <Action <EMail> > create = (call) => {
//投递邮件给qq服务器
using (var email = new EMail()) { //new EMail("mx1.qq.com", 25)，默认会自动解析收件箱的mx记录，得到smtp服务器地址，如果是要通过发件服务器来发送，则需要手动填写为发件服务器地址
//使用签名
email.TryUseDKIM(dkim);
email.FromEmail = "test@" + domain;
email.ToEmail("*****@*****.**"); //改成有效的邮箱地址
//添加附件
email.AddAttachment("abc文本内容123", "文本.txt");
email.AddAttachment("未命名文件内容，红红火火恍恍惚惚", "");
call(email);
}
};
create((email) => {
//发送邮件出去，去垃圾箱找，如果私钥是域名设置的话正常点
var res = email.Send("标题", "内容");
Console.WriteLine("【邮件发送】");
Console.WriteLine(res.IsError ? "失败：" + res.ErrorMessage : "成功");
Console.WriteLine();
});
create((email) => {
int len;
var msg = email.BuildMessage("标题", "内容", out len).Value;
//手动签名
dkim.Sign(msg);
//获取邮件内容
var raw = EMail_DKIM_MailMessageText.ToRAW(msg);
if (raw.IsError)
{
Console.WriteLine("获取邮件内容出错：" + raw.ErrorMessage);
return;
}
Console.WriteLine("【验证签名】");
Console.WriteLine(dkim.Verify(raw.Value) ? "合法" : "非法");
Console.WriteLine();
Console.WriteLine("【邮件(.eml)内容】");
Console.WriteLine(raw.Value.Raw);
});
create((email) => {
//设置发送到文件夹内，保存邮件，不投递
var dir = "d:/.email测试保存邮件文件夹";
Directory.CreateDirectory(dir);
email.OnSendBefore = (msg, smtp) => {
smtp.DeliveryMethod = SmtpDeliveryMethod.SpecifiedPickupDirectory;
smtp.PickupDirectoryLocation = dir;
return(true);
};
var res = email.Send("标题", "内容");
Console.WriteLine("【另类保存】");
Console.WriteLine("目录：" + dir);
Console.WriteLine("结果：" + (res.IsError ? "失败，" + res.ErrorMessage : "已保存"));
});
}
