/// <summary>
/// 初始化邮件体
/// </summary>
public MailMessage()
{
var now = DateTime.Now;
this.messageId = MailCommon.BuildMessageID(now);
//this.boundary = MailCommon.BuildBoundary(now);
this.boundary = this.messageId;
}
/// <summary>
/// 创建用于邮件体的邮件地址集合的数组
/// </summary>
/// <param name="addressList">须要处理的集合</param>
/// <param name="encoding"></param>
/// <returns>返回字符串型式数组</returns>
public static string JoinAddressList(List <MailAddress> addressList, Encoding encoding)
{
var array = new string[addressList.Count];
for (int i = 0, l = addressList.Count; i < l; i++)
{
var address = addressList[i];
array[i] = MailCommon.Base64EncodeAddress(address.Name, address.Address, encoding);
}
var result = string.Join(",", array);
return(result);
}
///// <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 + ">");
}
private string GenerateBody()
{
if (string.IsNullOrEmpty(this.Body))
{
throw new InvalidOperationException("message.Body is empty");
}
//编码完成
var body = Convert.ToBase64String(this.encoding.GetBytes(this.Body));
var sb = new StringBuilder();
//begin
sb.Append("--");
sb.Append(this.boundary);
sb.Append(MailCommon.NewLine); //分隔完成
if (this.IsBodyHtml == true)
{
sb.Append("Content-Type: text/html; charset=" + this.encoding.HeaderName);
}
else
{
sb.Append("Content-Type: text/plain; charset=" + this.encoding.HeaderName);
}
sb.Append(MailCommon.NewLine);
sb.Append("Content-Transfer-Encoding: base64");
sb.Append(MailCommon.NewLine);
sb.Append(MailCommon.NewLine);
sb.Append(MailCommon.Line76Break(body));
sb.Append(MailCommon.NewLine);
sb.Append(MailCommon.NewLine);
//end
// "--" + this.Boundary + "--" + MailCommon.NewLine;
sb.Append("--");
sb.Append(this.Boundary);
sb.Append("--");
sb.Append(MailCommon.NewLine);
return(sb.ToString());
}
/// <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());
}
/// <summary>
/// DKIM message
/// </summary>
/// <param name="message"></param>
/// <returns></returns>
public string Sign(MailMessage message)
{
//http://dkimcore.org/specification.html#1
//DKIM-Signature: v=1;a=rsa-sha256;bh=BODYHASH;c=relaxed;d=TOKEN;h=HEADERS;s=SELECTOR;b=SIGNATURE
//http://www.dkim.org/specs/rfc4871-dkimbase.html#dkim-sig-hdr
/*
* DKIM-Signature: v=1; a=rsa-sha256; c=simple/relaxed; d=domain.com;
* h=From:To:Subject:Date; q=dns/txt; s=newsletter17100; t=1510020630;
* bh=+5tUEqyyuolGsLc9usglUSkelpZtxEkEWKaGC21PSEM=;
* b=
*/
var dsLength = "DKIM-Signature: ".Length;
var build = new StringBuilder(128);
build.Append("DKIM-Signature:");
build.Append(" v=1;");
//
string algorithm = this.algorithm == DKIMAlgorithm.RSASha1 ? "rsa-sha1" : "rsa-sha256";
build.Append(" a=").Append(algorithm).Append(';');
//c=header type / bodey type;
string htype = this.headerType == DKIMType.Simple ? "simple" : "relaxed";
string bType = this.bodyType == DKIMType.Simple ? "simple" : "relaxed";
//build.Append(" c=simple/relaxed;");
build.Append(" c=").Append(htype).Append('/').Append(bType).Append(';').Append(MailCommon.NewLine);
//create time
long unixtime = Adf.UnixTimestampHelper.ToInt64Timestamp();
build.Append("\tt=").Append(unixtime).Append(';');
build.Append(" q=dns/txt;").Append(MailCommon.NewLine);
// domain
build.Append("\td=").Append(domain).Append(';');
// DNS selector
build.Append(" s=").Append(selector).Append(';').Append(MailCommon.NewLine);
//headers
build.Append("\th=").Append(string.Join(":", this.signHeaders)).Append(';').Append(MailCommon.NewLine);
//body hash
var body = "";
if (this.bodyType == DKIMType.Relaxed)
{
body = this.RelaxedBodyCanonicalization(message.GetBody());
}
else
{
body = this.SimpleBodyCanonicalization(message.GetBody());
}
var bodyBytes = message.Encoding.GetBytes(body);
var bodySigned = this.Hash(bodyBytes);
var bodyHash = Convert.ToBase64String(bodySigned);
build.Append("\tbh=").Append(bodyHash).Append(';').Append(MailCommon.NewLine);
//b
build.Append("\tb=");
//build string
/*
* DKIM-Signature: v=1; a=rsa-sha256; c=simple/relaxed; d=caping.co.id;
* s=newsletter17800; q=dns/txt; t=1510023325; h=From:To:Subject:Date;
* h=yklAmb1CNh0SAfmrk97PlZTEHrGKV94Ps6R7KDwLLoo=;
* b=
*/
//set current DKIM-Signature
var dkimHead = build.ToString(dsLength, build.Length - dsLength);
message.OutputHeaders["DKIM-Signature"] = dkimHead;
var headers = "";
if (this.headerType == DKIMType.Relaxed)
{
headers = this.RelaxedHeaderCanonicalization(message.OutputHeaders);
}
else
{
headers = this.SimpleHeaderCanonicalization(message.OutputHeaders);
}
var headerBytes = message.Encoding.GetBytes(headers);
var headerSigned = this.Sign(headerBytes);
// assumes signature ends with "b="
var b = Convert.ToBase64String(headerSigned);
b = MailCommon.Line76Break("b=" + b, "\t");
//remove last b
build.Length -= "\tb=".Length;
//append b
build.Append(b);
//update DKIM-Signature
dkimHead = build.ToString(dsLength, build.Length - dsLength);
message.OutputHeaders["DKIM-Signature"] = dkimHead;
var signed = build.ToString();
return(signed);
}
