///// <summary>
///// 将一个数组合并成符合邮件的每行最大76字符字符串，结果追加至字符构建对象
///// </summary>
///// <param name="list"></param>
///// <param name="builder"></param>
///// <param name="lineStart">每行初始字符</param>
//public static void JoinLine76Break(StringBuilder builder, IList<string> list, string lineStart)
//{
// var lineLength = builder.Length;
// var lineStartLength = lineStart.Length;
// if (lineStartLength > 76)
// {
// throw new ArgumentOutOfRangeException("lineStart", "length limit less than 76.");
// }
// for (int i = 0, l = list.Count; i < l; i++)
// {
// var itemLength = list[i].Length;
// if (lineLength + itemLength > 76)
// {
// builder.Append(MailCommon.NewLine);
// builder.Append(lineStart);
// lineLength = itemLength + lineStartLength;
// }
// else
// {
// lineLength += itemLength;
// }
// builder.Append(list[i]);
// }
//}
/// <summary>
/// 编码邮件地址头
/// </summary>
/// <param name="name"></param>
/// <param name="address"></param>
/// <param name="encoding"></param>
/// <returns></returns>
public static string Base64EncodeAddress(string name, string address, Encoding encoding)
{
//判断姓名是否为空
if (string.IsNullOrEmpty(name))
{
name = address.Split('@')[0];
}
//判断姓名是否为键盘可打印，如果是，则不进行编码，如果不是，则进行编码
if (MailCommon.IsAscii(name) == false)
{
name = MailCommon.Base64EncodHead(name, encoding);
}
return("\"" + name + "\" <" + address + ">");
}
/// <summary>
/// 获取邮件头，并填充 OutputHeaders
/// </summary>
/// <exception cref="InvalidOperationException">message.From invalid or message.To is empty or subject is empty</exception>
/// <returns></returns>
public string GetHead()
{
if (this.From == null || string.IsNullOrEmpty(this.From.Address))
{
throw new InvalidOperationException("message.From invalid");
}
if (this.To == null || this.To.Count == 0)
{
throw new InvalidOperationException("message.To is empty");
}
if (string.IsNullOrEmpty(this.Subject))
{
throw new InvalidOperationException("subject is empty");
}
this.outputHeaders = new NameValueCollection(15 + this.headers.Count);
StringBuilder sb = new StringBuilder();
//message id
var messageId = "<" + this.messageId + ">";
sb.Append("Message-ID: ");
sb.Append(messageId);
sb.Append(MailCommon.NewLine);
outputHeaders["Message-ID"] = messageId;
//from
var from = MailCommon.Base64EncodeAddress(this.From.Name, this.From.Address, this.encoding);
sb.Append("From: ");
sb.Append(from);
sb.Append(MailCommon.NewLine);
outputHeaders["From"] = from;
//replay
if (this.ReplyTo != null)
{
var replayTo = MailCommon.Base64EncodeAddress(this.ReplyTo.Name, this.ReplyTo.Address, this.encoding);
sb.Append("Replay-To: ");
sb.Append(replayTo);
sb.Append(MailCommon.NewLine);
outputHeaders["Replay-To"] = replayTo;
}
//to
var to = MailCommon.JoinAddressList(this.to, this.encoding);
sb.Append("To: ");
sb.Append(to);
sb.Append(MailCommon.NewLine);
outputHeaders["To"] = to;
//cc
if (this.cc != null && this.cc.Count > 0)
{
var cc = MailCommon.JoinAddressList(this.cc, this.encoding);
sb.Append("CC: ");
sb.Append(cc);
sb.Append(MailCommon.NewLine);
outputHeaders["CC"] = cc;
}
//Subject
var subject = "";
sb.Append("Subject: ");
if (MailCommon.IsAscii(this.Subject))
{
subject = this.Subject;
}
else
{
subject = MailCommon.Base64EncodHead(this.Subject, this.encoding);
}
sb.Append(subject);
sb.Append(MailCommon.NewLine);
outputHeaders["Subject"] = subject;
//Data
var date = DateTime.UtcNow.ToString("R");
sb.Append("Date: ");
sb.Append(date);
sb.Append(MailCommon.NewLine);
outputHeaders["Date"] = date;
//Mime
sb.Append(MailCommon.MimeVersion);
sb.Append(MailCommon.NewLine);
outputHeaders["MIME-Version"] = "1.0";
//priority
if (this.Priority != MailPriority.Normal)
{
sb.Append("X-Priority: ");
sb.Append((int)this.Priority);
sb.Append(MailCommon.NewLine);
outputHeaders["X-Priority"] = ((int)this.Priority).ToString();
}
//Mailer
sb.Append(MailCommon.Mailer);
sb.Append(MailCommon.NewLine);
outputHeaders["X-Mailer"] = "http://www.aooshi.org/adf/";
//Content-Type
//sb.Append(CreateContentType());
var contentType = "multipart/alternative;\r\n\tboundary=\"" + this.boundary + "\"";
sb.Append("Content-Type: ");
sb.Append(contentType);
sb.Append(MailCommon.NewLine);
outputHeaders["Content-Type"] = contentType;
//encoding
sb.Append("Content-Transfer-Encoding: base64");
sb.Append(MailCommon.NewLine);
outputHeaders["Content-Transfer-Encoding"] = "base64";
//custom headers
foreach (var key in this.headers.AllKeys)
{
sb.Append(key);
sb.Append(": ");
sb.Append(this.headers[key]);
sb.Append(MailCommon.NewLine);
//
outputHeaders[key] = this.headers[key];
}
//dkim
var dkim = this.dkim;
if (dkim != null)
{
var dkimValue = dkim.Sign(this);
//
sb.Insert(0, dkimValue + MailCommon.NewLine);
}
//
sb.Append(MailCommon.NewLine);
return(sb.ToString());
}