Introduction:
In this article I will explain how to integrate gmail mail into asp.net using pop3 server.
Pop3 Commands:
The commands used to retrieve mail from a Pop3 server by an email client are a series of text commands with single line responses from the mail server. The commands and examples used here are defined by RFC 1939- Post Office Protocol- Version 3.
user:
User is the first command after the connection is established. To connect, all you have to do is supply your e-mail user id.
Example Usage:
USER john.smith
PASS:
After having supplied your user name, the next command is to supply your e-mail password.
Example Usage:
PASS ****
STAT:
Returns the number of emails in the mailbox and the number of bytes all the emails are taking on the server.
Example Usage:
STAT
Sample Response: +OK 3 345910
Takes two arguments i.e., the sort number of the email on the server and the number of lines of text to retrieve from the body of the email.
Example Usage:
TOP 1 0
retr:
Takes one argument i.e., the sort number of the email on the server and returns all the headers and lines from the body of the email.
Example Usage:
RETR 1
dele:
Takes one argument i.e., the sort number of the email on the server and deletes it.
Example Usage:
DELE 1
Reset any DELE commands given above. The emails marked to be deleted by DELE command are unmarked.
Example Usage:
RSET
Closes the user session with the server.
Example Usage:
QUIT
Steps:
Create a new WebPage in VS 2008.
Step 1:
Create a Class file named Pop3.cs.
Paste the code below into Pop3.cs:
using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Configuration;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Security;
using System.Net.Sockets;
using System.Text;
using System.Text.RegularExpressions;
using System.Web;
using System.Xml;
namespace mail
{
public class Pop3Client : IDisposable
{
public string Host { get; protected set; }
public int Port { get; protected set; }
public string Email { get; protected set; }
public string Password { get; protected set; }
public bool IsSecure { get; protected set; }
public TcpClient Client { get; protected set; }
public Stream ClientStream { get; protected set; }
public StreamWriter Writer { get; protected set; }
public StreamReader Reader { get; protected set; }
private bool disposed = false;
public Pop3Client(string host, int port, string email, string password): this(host, port, email, password, false){}
public Pop3Client(string host, int port, string email, string password, bool secure)
{
Host = host;
Port = port;
Email = email;
Password = password;
IsSecure = secure;
}
public void Connect()
{
if (Client == null)
Client = new TcpClient();
if (!Client.Connected)
Client.Connect(Host, Port);
if (IsSecure)
{
SslStream secureStream = new SslStream(Client.GetStream());
secureStream.AuthenticateAsClient(Host);
ClientStream = secureStream;
secureStream = null;
}
else
ClientStream = Client.GetStream();
Writer = new StreamWriter(ClientStream);
Reader = new StreamReader(ClientStream);
ReadLine();
Login();
}
public int GetEmailCount()
{
int count = 0;
string response = SendCommand("STAT");
if (IsResponseOk(response))
{
string[] arr = response.Substring(4).Split(' ');
count = Convert.ToInt32(arr[0]);
}
else
count = -1;
return count;
}
public Email FetchEmail(int emailId)
{
if (IsResponseOk(SendCommand("TOP " + emailId + " 0")))
return new Email(ReadLines());
else
return null;
}
public List<Email> FetchEmailList(int start, int count)
{
List<Email> emails = new List<Email>(count);
for (int i = start; i < (start + count); i++)
{
Email email = FetchEmail(i);
if (email != null)
emails.Add(email);
}
return emails;
}
public List<MessagePart> FetchMessageParts(int emailId)
{
if (IsResponseOk(SendCommand("RETR " + emailId)))
return Util.ParseMessageParts(ReadLines());
return null;
}
public void Close()
{
if (Client != null)
{
if (Client.Connected)
Logout();
Client.Close();
Client = null;
}
if (ClientStream != null)
{
ClientStream.Close();
ClientStream = null;
}
if (Writer != null)
{
Writer.Close();
Writer = null;
}
if (Reader != null)
{
Reader.Close();
Reader = null;
}
disposed = true;
}
public void Dispose()
{
if (!disposed)
Close();
}
protected void Login()
{
if ((!IsResponseOk(SendCommand("USER " + Email))) || (!IsResponseOk(SendCommand("PASS " + Password))))
throw new Exception("User/password not accepted");
}
protected void Logout()
{
SendCommand("RSET");
}
protected string SendCommand(string cmdtext)
{
Writer.WriteLine(cmdtext);
Writer.Flush();
return ReadLine();
}
protected string ReadLine()
{
return Reader.ReadLine() + "\r\n";
}
protected string ReadLines()
{
StringBuilder b = new StringBuilder();
while (true)
{
string temp = ReadLine();
if (temp == ".\r\n" || temp.IndexOf("-ERR") != -1)
break;
b.Append(temp);
}
return b.ToString();
}
protected static bool IsResponseOk(string response)
{
if (response.StartsWith("+OK"))
return true;
if (response.StartsWith("-ERR"))
return false;
throw new Exception("Cannot understand server response: " + response);
}
}
public class Email
{
public NameValueCollection Headers { get; protected set; }
public string ContentType { get; protected set; }
public DateTime UtcDateTime { get; protected set; }
public string From { get; protected set; }
public string To { get; protected set; }
public string Subject { get; protected set; }
public Email(string emailText)
{
Headers = Util.ParseHeaders(emailText);
ContentType = Headers["Content-Type"];
From = Headers["From"];
To = Headers["To"];
Subject = Headers["Subject"];
if (Headers["Date"] != null)
try
{
UtcDateTime =Util.ConvertStrToUtcDateTime(Headers["Date"]);
}
catch (FormatException)
{
UtcDateTime = DateTime.MinValue;
}
else
UtcDateTime = DateTime.MinValue;
}
}
public class MessagePart
{
public NameValueCollection Headers { get; protected set; }
public string ContentType { get; protected set; }
public string MessageText { get; protected set; }
public MessagePart(NameValueCollection headers, string messageText)
{
Headers = headers;
ContentType = Headers["Content-Type"];
MessageText = messageText;
}
}
public class Util
{
protected static Regex BoundaryRegex = new Regex("Content-Type: multipart(?:/\\S+;)" + "\\s+[^\r\n]*boundary=\"?(?<boundary>" + "[^\"\r\n]+)\"?\r\n", RegexOptions.IgnoreCase | RegexOptions.Compiled);
protected static Regex UtcDateTimeRegex = new Regex(@"^(?:\w+,\s+)?(?<day>\d+)\s+(?<month>\w+)\s+(?<year>\d+)\s+(?<hour>\d{1,2})" + @":(?<minute>\d{1,2}):(?<second>\d{1,2})\s+(?<offsetsign>\-|\+)(?<offsethours>" + @"\d{2,2})(?<offsetminutes>\d{2,2})(?:.*)$", RegexOptions.IgnoreCase | RegexOptions.Compiled);
public static NameValueCollection ParseHeaders(string headerText)
{
NameValueCollection headers = new NameValueCollection();
StringReader reader = new StringReader(headerText);
string line;
string headerName = null, headerValue;
int colonIndx;
while ((line = reader.ReadLine()) != null)
{
if (line == "")
break;
if (Char.IsLetterOrDigit(line[0]) && (colonIndx = line.IndexOf(':')) != -1)
{
headerName = line.Substring(0, colonIndx);
headerValue = line.Substring(colonIndx + 1).Trim();
headers.Add(headerName, headerValue);
}
else if (headerName != null)
headers[headerName] += " " + line.Trim();
else
throw new FormatException("Could not parse headers");
}
return headers;
}
public static List<MessagePart> ParseMessageParts(string emailText)
{
List<MessagePart> messageParts = new List<MessagePart>();
int newLinesIndx = emailText.IndexOf("\r\n\r\n");
Match m = BoundaryRegex.Match(emailText);
if (m.Index < emailText.IndexOf("\r\n\r\n") && m.Success)
{
string boundary = m.Groups["boundary"].Value;
string startingBoundary = "\r\n--" + boundary;
int startingBoundaryIndx = -1;
while (true)
{
if (startingBoundaryIndx == -1)
startingBoundaryIndx = emailText.IndexOf(startingBoundary);
if (startingBoundaryIndx != -1)
{
int nextBoundaryIndx = emailText.IndexOf(startingBoundary, startingBoundaryIndx + startingBoundary.Length);
if (nextBoundaryIndx != -1 && nextBoundaryIndx != startingBoundaryIndx)
{
string multipartMsg = emailText.Substring(startingBoundaryIndx + startingBoundary.Length, (nextBoundaryIndx - startingBoundaryIndx - startingBoundary.Length));
int headersIndx = multipartMsg.IndexOf("\r\n\r\n");
if (headersIndx == -1)
throw new FormatException("Incompatible multipart message format");
string bodyText = multipartMsg.Substring(headersIndx).Trim();
NameValueCollection headers = Util.ParseHeaders(multipartMsg.Trim());
messageParts.Add(new MessagePart(headers, bodyText));
}
else
break;
startingBoundaryIndx = nextBoundaryIndx;
}
else
break;
}
if (newLinesIndx != -1)
{
string emailBodyText = emailText.Substring(newLinesIndx + 1);
}
}
else
{
int headersIndx = emailText.IndexOf("\r\n\r\n");
if (headersIndx == -1)
throw new FormatException("Incompatible multipart message format");
string bodyText = emailText.Substring(headersIndx).Trim();
NameValueCollection headers = Util.ParseHeaders(emailText);
messageParts.Add(new MessagePart(headers, bodyText));
}
return messageParts;
}
public static DateTime ConvertStrToUtcDateTime(string str)
{
Match m = UtcDateTimeRegex.Match(str);
int day, month, year, hour, min, sec;
if (m.Success)
{
day = Convert.ToInt32(m.Groups["day"].Value);
year = Convert.ToInt32(m.Groups["year"].Value);
hour = Convert.ToInt32(m.Groups["hour"].Value);
min = Convert.ToInt32(m.Groups["minute"].Value);
sec = Convert.ToInt32(m.Groups["second"].Value);
switch (m.Groups["month"].Value)
{
case "Jan":
month = 1;
break;
case "Feb":
month = 2;
break;
case "Mar":
month = 3;
break;
case "Apr":
month = 4;
break;
case "May":
month = 5;
break;
case "Jun":
month = 6;
break;
case "Jul":
month = 7;
break;
case "Aug":
month = 8;
break;
case "Sep":
month = 9;
break;
case "Oct":
month = 10;
break;
case "Nov":
month = 11;
break;
case "Dec":
month = 12;
break;
default:
throw new FormatException("Unknown month.");
}
string offsetSign = m.Groups["offsetsign"].Value;
int offsetHours = Convert.ToInt32(m.Groups["offsethours"].Value);
int offsetMinutes = Convert.ToInt32(m.Groups["offsetminutes"].Value);
DateTime dt = new DateTime(year, month, day, hour, min, sec);
if (offsetSign == "+")
{
dt.AddHours(offsetHours);
dt.AddMinutes(offsetMinutes);
}
else if (offsetSign == "-")
{
dt.AddHours(-offsetHours);
dt.AddMinutes(-offsetMinutes);
}
return dt;
}
throw new FormatException("Incompatible date/time string format");
}
}
}
|
Step 2:
Add a WebPage named as Home.aspx.
Paste this Designing Page into Home.aspx:
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Untitled Page</title>
<style type="text/css">
.style1
{
width: 50%;
}
</style>
</head>
<body>
<form id="form1" runat="server">
<div>
<table class="style1">
<tr>
<td colspan="3">
<h2 style="text-align: center">Welcome To Gmail</h2></td>
</tr>
<tr>
<td>
<asp:Label ID="Label1" runat="server" Text="Gmail ID :"></asp:Label>
</td>
<td>
<asp:TextBox ID="txt_email" runat="server" Width="241px"></asp:TextBox>
</td>
<td>
<asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server"
ControlToValidate="txt_email" ErrorMessage="Invalid Mail Format"
ValidationExpression="\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*"></asp:RegularExpressionValidator>
</td>
</tr>
<tr>
<td>
<asp:Label ID="Label2" runat="server" Text="Password :"></asp:Label>
</td>
<td>
<asp:TextBox ID="txt_password" runat="server" TextMode="Password" Width="239px"></asp:TextBox>
</td>
<td>
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server"
ControlToValidate="txt_password" ErrorMessage="*"></asp:RequiredFieldValidator>
</td>
</tr>
<tr>
<td colspan="3" style="text-align: center">
<asp:Button ID="Button1" runat="server" CausesValidation="False"
onclick="Button1_Click" style="text-align: center" Text="Login" Width="72px" />
</td>
</tr>
</table>
</div>
</form>
</body>
</html>
|
Paste this code into Home.aspx.cs:
using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
public partial class Home : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button1_Click(object sender, EventArgs e)
{
Session["email"] = txt_email.Text;
Session["pwd"] = txt_password.Text;
Response.Redirect("Pop3Client.aspx");
}
}
|
Step 3:
Add a WebPage named as Pop3Client.aspx.
Paste this Designing Page into Pop3Client.aspx:
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title></title>
<style type="text/css">
.emails-table { width: 600px; border: solid 1px #444444; }
.emails-table-header { font-family: "Trebuchet MS"; font-size: 9pt;
background-color: #0099B9; color: white;
border: solid 1px #444444; }
.emails-table-header-cell { font-family: "Georgia"; font-size: 9pt;
font-weight: bold; border: solid 1px #666666; padding: 6px; }
.emails-table-cell { font-family: "Georgia"; font-size: 9pt;
border: solid 1px #666666; padding: 6px; }
.emails-table-footer { border: solid 1px #666666; padding: 3px;
width: 50%; }
.email-datetime { float: right; color: #666666; }
a { font-family: "Lucida Sans Unicode", "Trebuchet MS"; font-size: 9pt;
color: #005B7F; }
a:hover { color:red; }
</style>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Table ID="EmailsTable" CssClass="emails-table" runat="server">
<asp:TableHeaderRow>
<asp:TableHeaderCell CssClass="emails-table-header"
ColumnSpan="4">Listing emails
<asp:Literal ID="EmailFromLiteral" runat="server" />-
<asp:Literal ID="EmailToLiteral" runat="server" /> of
<asp:Literal ID="EmailTotalLiteral" runat="server" /> for
<asp:Literal ID="EmailLiteral" runat="server" />
</asp:TableHeaderCell>
</asp:TableHeaderRow>
<asp:TableRow>
<asp:TableCell CssClass="emails-table-header-cell">
#</asp:TableCell>
<asp:TableCell CssClass="emails-table-header-cell">
From</asp:TableCell>
<asp:TableCell CssClass="emails-table-header-cell">
Subject</asp:TableCell>
<asp:TableCell CssClass="emails-table-header-cell">
Date & Time</asp:TableCell>
</asp:TableRow>
<asp:TableFooterRow>
<asp:TableCell CssClass="emails-table-footer" ColumnSpan="4">
<asp:Table ID="FooterTable" Width="100%"
BorderWidth="0" runat="server">
<asp:TableRow>
<asp:TableCell>
<asp:Literal ID="PreviousPageLiteral" runat="server" />
</asp:TableCell>
<asp:TableCell HorizontalAlign="Right">
<asp:Literal ID="NextPageLiteral" runat="server" />
</asp:TableCell>
</asp:TableRow>
</asp:Table>
</asp:TableCell>
</asp:TableFooterRow>
</asp:Table>
</div>
</form>
</body>
</html>
|
Paste this code into Pop3Client.aspx.cs:
using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Collections.Generic;
using mail;
public partial class Pop3Client : System.Web.UI.Page
{
public const string Host = "pop.gmail.com";
public const int Port = 995;
public string Email ;
public string Password ;
public const int NoOfEmailsPerPage = 5;
public const string SelfLink ="<a href=\"Pop3Client.aspx?page={0}\">{1}</a>";
public const string DisplayEmailLink ="<a href=\"DisplayPop3Email.aspx?emailId={0}\">{1}</a>";
protected void Page_Load(object sender, EventArgs e)
{
int page = 1;
if (Request.QueryString["page"] == null)
{
Response.Redirect("Pop3Client.aspx?page=1");
Response.Flush();
Response.End();
}
else
page = Convert.ToInt32(Request.QueryString["page"]);
try
{
Email = Session["email"].ToString();
Password = Session["pwd"].ToString();
}
catch (Exception ex) { Response.Redirect("Home.aspx"); }
int totalEmails;
List<Email> emails;
string emailAddress;
using (mail.Pop3Client client = new mail.Pop3Client(Host, Port, Email, Password, true))
{
emailAddress = client.Email;
client.Connect();
totalEmails = client.GetEmailCount();
emails = client.FetchEmailList(((page - 1) * NoOfEmailsPerPage) + 1, NoOfEmailsPerPage);
}
int totalPages;
int mod = totalEmails % NoOfEmailsPerPage;
if (mod == 0)
totalPages = totalEmails / NoOfEmailsPerPage;
else
totalPages = ((totalEmails - mod) / NoOfEmailsPerPage) + 1;
for (int i = 0; i < emails.Count; i++)
{
Email email = emails[i];
int emailId = ((page - 1) * NoOfEmailsPerPage) + i + 1;
TableCell noCell = new TableCell();
noCell.CssClass = "emails-table-cell";
noCell.Text = Convert.ToString(emailId);
TableCell fromCell = new TableCell();
fromCell.CssClass = "emails-table-cell";
fromCell.Text = email.From;
TableCell subjectCell = new TableCell();
subjectCell.CssClass = "emails-table-cell";
subjectCell.Style["width"] = "300px";
subjectCell.Text = String.Format(DisplayEmailLink, emailId, email.Subject);
TableCell dateCell = new TableCell();
dateCell.CssClass = "emails-table-cell";
if (email.UtcDateTime != DateTime.MinValue)
dateCell.Text = email.UtcDateTime.ToString();
TableRow emailRow = new TableRow();
emailRow.Cells.Add(noCell);
emailRow.Cells.Add(fromCell);
emailRow.Cells.Add(subjectCell);
emailRow.Cells.Add(dateCell);
EmailsTable.Rows.AddAt(2 + i, emailRow);
}
if (totalPages > 1)
{
if (page > 1)
PreviousPageLiteral.Text = String.Format(SelfLink, page - 1, "Previous Page");
if (page > 0 && page < totalPages)
NextPageLiteral.Text = String.Format(SelfLink, page + 1, "Next Page");
}
EmailFromLiteral.Text = Convert.ToString(((page - 1) * NoOfEmailsPerPage) + 1);
EmailToLiteral.Text = Convert.ToString(page * NoOfEmailsPerPage);
EmailTotalLiteral.Text = Convert.ToString(totalEmails);
EmailLiteral.Text = emailAddress;
}
}
|
Step 4:
Add a WebPage named as DisplayPop3Email.aspx.
Paste this Designing Page into DisplayPop3Email.aspx:
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title></title>
<style type="text/css">
.emails-table { width: 600px; border: solid 1px #444444; }
.emails-table-header { font-family: "Trebuchet MS"; font-size: 9pt;
background-color: #0099B9; font-weight: bold; color: white;
text-align: center; border: solid 1px #444444; }
.emails-table-header-cell { font-family: "Georgia"; font-size: 9pt;
font-weight: bold; border: solid 1px #666666; padding: 6px; }
.emails-table-cell { font-family: "Georgia"; font-size: 9pt;
border: solid 1px #666666; padding: 6px; }
.emails-table-footer { border: solid 1px #666666; padding: 3px;
width: 50%; }
.email-datetime { float: right; color: #666666; }
a { font-family: "Lucida Sans Unicode", "Trebuchet MS"; font-size: 9pt;
color: #005B7F; }
a:hover { color:red; }
pre { font-family: "Georgia"; font-size: 9pt; }
</style>
</head>
<body>
<form id="form1" runat="server">
<asp:Literal ID="DebugLiteral" runat="server" />
<table class="emails-table">
<tr>
<td class="emails-table-header" colspan="2">
Email #<asp:Literal ID="EmailIdLiteral" runat="server" /></td>
</tr>
<tr>
<td class="emails-table-header-cell">Date & Time</td>
<td class="emails-table-cell">
<asp:Literal ID="DateLiteral" runat="server" /></td>
</tr>
<tr>
<td class="emails-table-header-cell">From</td>
<td class="emails-table-cell">
<asp:Literal ID="FromLiteral" runat="server" /></td>
</tr>
<tr>
<td class="emails-table-header-cell">Subject</td>
<td class="emails-table-cell">
<asp:Literal ID="SubjectLiteral" runat="server" /></td>
</tr>
<tr id="AttachementsRow" runat="server">
<td class="emails-table-header-cell">Attachments</td>
<td class="emails-table-cell">
<asp:Literal ID="AttachmentsLiteral" runat="server" /></td>
</tr>
<tr>
<td class="emails-table-cell" colspan="2">
<asp:Literal ID="HeadersLiteral" runat="server" /></td>
</tr>
<tr>
<td class="emails-table-cell" colspan="2">
<asp:Literal ID="BodyLiteral" runat="server" /></td>
</tr>
</table>
</form>
</body>
</html>
|
Paste this code into DisplayPop3Email.aspx.cs:
using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Collections.Generic;
using mail;
using System.Text.RegularExpressions;
using System.Text;
public partial class DisplayPop3Email : System.Web.UI.Page
{
public const string Host = "pop.gmail.com";
public const int Port = 995;
public string Email ;
public string Password;
protected static Regex CharsetRegex = new Regex("charset=\"?(?<charset>[^\\s\"]+)\"?", RegexOptions.IgnoreCase | RegexOptions.Compiled);
protected static Regex QuotedPrintableRegex = new Regex("=(?<hexchars>[0-9a-fA-F]{2,2})", RegexOptions.IgnoreCase | RegexOptions.Compiled);
protected static Regex UrlRegex = new Regex("(?<url>https?://[^\\s\"]+)", RegexOptions.IgnoreCase | RegexOptions.Compiled);
protected static Regex FilenameRegex = new Regex("filename=\"?(?<filename>[^\\s\"]+)\"?", RegexOptions.IgnoreCase | RegexOptions.Compiled);
protected static Regex NameRegex = new Regex("name=\"?(?<filename>[^\\s\"]+)\"?", RegexOptions.IgnoreCase | RegexOptions.Compiled);
protected void Page_Load(object sender, EventArgs e)
{
int emailId = -1;
if (Request.QueryString["emailId"] == null)
{
Response.Redirect("Pop3Client.aspx");
Response.Flush();
Response.End();
}
else
Email = Session["email"].ToString();
Password = Session["pwd"].ToString();
emailId = Convert.ToInt32(Request.QueryString["emailId"]);
Email email = null;
List<MessagePart> msgParts = null;
using (mail.Pop3Client client = new mail.Pop3Client (Host, Port,Email, Password, true))
{
client.Connect();
email = client.FetchEmail(emailId);
msgParts = client.FetchMessageParts(emailId);
}
if (email == null || msgParts == null)
{
Response.Redirect("Pop3Client.aspx");
Response.Flush();
Response.End();
}
MessagePart preferredMsgPart = FindMessagePart(msgParts, "text/html");
if (preferredMsgPart == null)
preferredMsgPart = FindMessagePart(msgParts, "text/plain");
else if (preferredMsgPart == null && msgParts.Count > 0)
preferredMsgPart = msgParts[0];
string contentType, charset, contentTransferEncoding, body = null;
if (preferredMsgPart != null)
{
contentType = preferredMsgPart.Headers["Content-Type"];
charset = "us-ascii";
contentTransferEncoding =preferredMsgPart.Headers["Content-Transfer-Encoding"];
Match m = CharsetRegex.Match(contentType);
if (m.Success)
charset = m.Groups["charset"].Value;
HeadersLiteral.Text = contentType != null ? "Content-Type: " +contentType + "<br />" : string.Empty;
HeadersLiteral.Text += contentTransferEncoding != null ?"Content-Transfer-Encoding: " +contentTransferEncoding : string.Empty;
if (contentTransferEncoding != null)
{
if (contentTransferEncoding.ToLower() == "base64")
body = DecodeBase64String(charset,preferredMsgPart.MessageText);
else if (contentTransferEncoding.ToLower() =="quoted-printable")
body = DecodeQuotedPrintableString(preferredMsgPart.MessageText);
else
body = preferredMsgPart.MessageText;
}
else
body = preferredMsgPart.MessageText;
}
EmailIdLiteral.Text = Convert.ToString(emailId);
DateLiteral.Text = email.UtcDateTime.ToString(); ;
FromLiteral.Text = email.From;
SubjectLiteral.Text = email.Subject;
BodyLiteral.Text = preferredMsgPart != null ? (preferredMsgPart.Headers["Content-Type"].IndexOf("text/plain") != -1 ?"<pre>" + FormatUrls(body) + "</pre>" : body) : null;
ListAttachments(msgParts);
}
protected Decoder GetDecoder(string charset)
{
Decoder decoder;
switch (charset.ToLower())
{
case "utf-7":
decoder = Encoding.UTF7.GetDecoder();
break;
case "utf-8":
decoder = Encoding.UTF8.GetDecoder();
break;
case "us-ascii":
decoder = Encoding.ASCII.GetDecoder();
break;
case "iso-8859-1":
decoder = Encoding.ASCII.GetDecoder();
break;
default:
decoder = Encoding.ASCII.GetDecoder();
break;
}
return decoder;
}
protected string DecodeBase64String(string charset, string encodedString)
{
Decoder decoder = GetDecoder(charset);
byte[] buffer = Convert.FromBase64String(encodedString);
char[] chararr = new char[decoder.GetCharCount(buffer,0, buffer.Length)];
decoder.GetChars(buffer, 0, buffer.Length, chararr, 0);
return new string(chararr);
}
protected string DecodeQuotedPrintableString(string encodedString)
{
StringBuilder b = new StringBuilder();
int startIndx = 0;
MatchCollection matches = QuotedPrintableRegex.Matches(encodedString);
for (int i = 0; i < matches.Count; i++)
{
Match m = matches[i];
string hexchars = m.Groups["hexchars"].Value;
int charcode = Convert.ToInt32(hexchars, 16);
char c = (char)charcode;
if (m.Index > 0)
b.Append(encodedString.Substring(startIndx, (m.Index - startIndx)));
b.Append(c);
startIndx = m.Index + 3;
}
if (startIndx < encodedString.Length)
b.Append(encodedString.Substring(startIndx));
return Regex.Replace(b.ToString(), "=\r\n", "");
}
protected void ListAttachments(List<MessagePart> msgParts)
{
bool attachmentsFound = false;
StringBuilder b = new StringBuilder();
b.Append("<ol>");
foreach (MessagePart p in msgParts)
{
string contentType = p.Headers["Content-Type"];
string contentDisposition = p.Headers["Content-Disposition"];
Match m;
if (contentDisposition != null)
{
m = FilenameRegex.Match(contentDisposition);
if (m.Success)
{
attachmentsFound = true;
b.Append("<li>").Append(m.Groups["filename"].Value).Append("</li>");
}
}
else if (contentType != null)
{
m = NameRegex.Match(contentType);
if (m.Success)
{
attachmentsFound = true;
b.Append("<li>").Append(m.Groups["filename"].Value).Append("</li>");
}
}
}
b.Append("</ol>");
if (attachmentsFound)
AttachmentsLiteral.Text = b.ToString();
else
AttachementsRow.Visible = false;
}
protected MessagePart FindMessagePart(List<MessagePart> msgParts,string contentType)
{
foreach (MessagePart p in msgParts)
if (p.ContentType != null && p.ContentType.IndexOf(contentType) != -1)
return p;
return null;
}
protected string FormatUrls(string plainText)
{
string replacementLink = "<a href=\"${url}\">${url}</a>";
return UrlRegex.Replace(plainText, replacementLink);
}
}
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