/// <summary>
/// Default constructor.
/// </summary>
/// <param name="messages"></param>
/// <param name="messageID">Internal messageID.</param>
/// <param name="UID">Message UID. NOTE: message uid must increase all the time, for new messages.</param>
/// <param name="flags">Message flags.</param>
/// <param name="size">Message size.</param>
/// <param name="date">Message receive date.</param>
internal IMAP_Message(IMAP_Messages messages, string messageID, int UID, IMAP_MessageFlags flags, long size, DateTime date)
{
m_Messages = messages;
m_MessageID = messageID;
m_UID = UID;
m_Flags = flags;
m_Size = size;
m_Date = date;
}
/// <summary>
/// Default constructor.
/// </summary>
/// <param name="messages"></param>
/// <param name="messageID">Internal messageID.</param>
/// <param name="UID">Message UID. NOTE: message uid must increase all the time, for new messages.</param>
/// <param name="flags">Message flags.</param>
/// <param name="size">Message size.</param>
/// <param name="date">Message receive date.</param>
internal IMAP_Message(IMAP_Messages messages,string messageID,int UID,IMAP_MessageFlags flags,long size,DateTime date)
{
m_Messages = messages;
m_MessageID = messageID;
m_UID = UID;
m_Flags = flags;
m_Size = size;
m_Date = date;
}
/// <summary>
/// Raises event 'GetMessagesInfo'.
/// </summary>
/// <param name="session">Reference to IMAP session.</param>
/// <param name="mailbox">Mailbox which messages info to get.</param>
/// <returns></returns>
internal IMAP_Messages OnGetMessagesInfo(IMAP_Session session, string mailbox)
{
IMAP_Messages messages = new IMAP_Messages(mailbox);
if (this.GetMessagesInfo != null)
{
this.GetMessagesInfo(session, messages);
}
return(messages);
}
/// <summary>
/// Raises event 'GetMessagesInfo'.
/// </summary>
/// <param name="session">Reference to IMAP session.</param>
/// <param name="mailbox">Mailbox which messages info to get.</param>
/// <returns></returns>
internal IMAP_Messages OnGetMessagesInfo(IMAP_Session session,string mailbox)
{
IMAP_Messages messages = new IMAP_Messages(mailbox);
if(this.GetMessagesInfo != null){
this.GetMessagesInfo(session,messages);
}
return messages;
}
private void Examine(string cmdTag,string argsText)
{
/* Rfc 3501 6.3.2 EXAMINE Command
Arguments: mailbox name
Responses: REQUIRED untagged responses: FLAGS, EXISTS, RECENT
REQUIRED OK untagged responses: UNSEEN, PERMANENTFLAGS,
UIDNEXT, UIDVALIDITY
Result: OK - examine completed, now in selected state
NO - examine failure, now in authenticated state: no
such mailbox, can't access mailbox
BAD - command unknown or arguments invalid
The EXAMINE command is identical to SELECT and returns the same
output; however, the selected mailbox is identified as read-only.
No changes to the permanent state of the mailbox, including
per-user state, are permitted; in particular, EXAMINE MUST NOT
cause messages to lose the \Recent flag.
The text of the tagged OK response to the EXAMINE command MUST
begin with the "[READ-ONLY]" response code.
Example: C: A932 EXAMINE blurdybloop
S: * 17 EXISTS
S: * 2 RECENT
S: * OK [UNSEEN 8] Message 8 is first unseen
S: * OK [UIDVALIDITY 3857529045] UIDs valid
S: * OK [UIDNEXT 4392] Predicted next UID
S: * FLAGS (\Answered \Flagged \Deleted \Seen \Draft)
S: * OK [PERMANENTFLAGS ()] No permanent flags permitted
S: A932 OK [READ-ONLY] EXAMINE completed
*/
if(!m_Authenticated){
m_pSocket.SendLine(cmdTag + " NO Authenticate first !");
return;
}
string[] args = ParseParams(argsText);
if(args.Length != 1){
m_pSocket.SendLine(cmdTag + " BAD EXAMINE invalid arguments");
return;
}
IMAP_Messages messages = m_pServer.OnGetMessagesInfo(this,args[0]);
if(messages.ErrorText == null){
messages.ReadOnly = true;
m_Messages = messages;
m_SelectedMailbox = argsText;
string response = "";
response += "* FLAGS (\\Answered \\Flagged \\Deleted \\Seen \\Draft)\r\n";
response += "* " + m_Messages.Count + " EXISTS\r\n";
response += "* " + m_Messages.RecentCount + " RECENT\r\n";
response += "* OK [UNSEEN " + m_Messages.FirstUnseen + "] Message " + m_Messages.FirstUnseen + " is first unseen\r\n";
response += "* OK [UIDVALIDITY " + m_Messages.MailboxUID + "] UIDs valid\r\n";
response += "* OK [UIDNEXT " + m_Messages.UID_Next + "] Predicted next UID\r\n";
response += "* OK [PERMANENTFLAGS (\\Answered \\Flagged \\Deleted \\Seen \\Draft)] Available permanent falgs\r\n";
response += cmdTag + " OK [READ-ONLY] EXAMINE Completed\r\n";
m_pSocket.SendData(response);
}
else{
m_pSocket.SendLine(cmdTag + " NO " + messages.ErrorText);
}
}
//--- End of non-Authenticated State
//--- Authenticated State ------
#region function Select
private void Select(string cmdTag,string argsText)
{
/* Rfc 3501 6.3.1 SELECT Command
Arguments: mailbox name
Responses: REQUIRED untagged responses: FLAGS, EXISTS, RECENT
REQUIRED OK untagged responses: UNSEEN, PERMANENTFLAGS,
UIDNEXT, UIDVALIDITY
Result: OK - select completed, now in selected state
NO - select failure, now in authenticated state: no
such mailbox, can't access mailbox
BAD - command unknown or arguments invalid
The SELECT command selects a mailbox so that messages in the
mailbox can be accessed. Before returning an OK to the client,
the server MUST send the following untagged data to the client.
Note that earlier versions of this protocol only required the
FLAGS, EXISTS, and RECENT untagged data; consequently, client
implementations SHOULD implement default behavior for missing data
as discussed with the individual item.
FLAGS Defined flags in the mailbox. See the description
of the FLAGS response for more detail.
<n> EXISTS The number of messages in the mailbox. See the
description of the EXISTS response for more detail.
<n> RECENT The number of messages with the \Recent flag set.
See the description of the RECENT response for more
detail.
OK [UNSEEN <n>]
The message sequence number of the first unseen
message in the mailbox. If this is missing, the
client can not make any assumptions about the first
unseen message in the mailbox, and needs to issue a
SEARCH command if it wants to find it.
OK [PERMANENTFLAGS (<list of flags>)]
A list of message flags that the client can change
permanently. If this is missing, the client should
assume that all flags can be changed permanently.
OK [UIDNEXT <n>]
The next unique identifier value. Refer to section
2.3.1.1 for more information. If this is missing,
the client can not make any assumptions about the
next unique identifier value.
OK [UIDVALIDITY <n>]
The unique identifier validity value. Refer to
section 2.3.1.1 for more information. If this is
missing, the server does not support unique
identifiers.
Only one mailbox can be selected at a time in a connection;
simultaneous access to multiple mailboxes requires multiple
connections. The SELECT command automatically deselects any
currently selected mailbox before attempting the new selection.
Consequently, if a mailbox is selected and a SELECT command that
fails is attempted, no mailbox is selected.
If the client is permitted to modify the mailbox, the server
SHOULD prefix the text of the tagged OK response with the
"[READ-WRITE]" response code.
If the client is not permitted to modify the mailbox but is
permitted read access, the mailbox is selected as read-only, and
the server MUST prefix the text of the tagged OK response to
SELECT with the "[READ-ONLY]" response code. Read-only access
through SELECT differs from the EXAMINE command in that certain
read-only mailboxes MAY permit the change of permanent state on a
per-user (as opposed to global) basis. Netnews messages marked in
a server-based .newsrc file are an example of such per-user
permanent state that can be modified with read-only mailboxes.
Example: C: A142 SELECT INBOX
S: * 172 EXISTS
S: * 1 RECENT
S: * OK [UNSEEN 12] Message 12 is first unseen
S: * OK [UIDVALIDITY 3857529045] UIDs valid
S: * OK [UIDNEXT 4392] Predicted next UID
S: * FLAGS (\Answered \Flagged \Deleted \Seen \Draft)
S: * OK [PERMANENTFLAGS (\Deleted \Seen \*)] Limited
S: A142 OK [READ-WRITE] SELECT completed
*/
if(!m_Authenticated){
m_pSocket.SendLine(cmdTag + " NO Authenticate first !");
return;
}
string[] args = ParseParams(argsText);
if(args.Length != 1){
m_pSocket.SendLine(cmdTag + " BAD SELECT invalid arguments");
return;
}
IMAP_Messages messages = m_pServer.OnGetMessagesInfo(this,args[0]);
if(messages.ErrorText == null){
m_Messages = messages;
m_SelectedMailbox = args[0];
string response = "";
response += "* FLAGS (\\Answered \\Flagged \\Deleted \\Seen \\Draft)\r\n";
response += "* " + m_Messages.Count + " EXISTS\r\n";
response += "* " + m_Messages.RecentCount + " RECENT\r\n";
response += "* OK [UNSEEN " + m_Messages.FirstUnseen + "] Message " + m_Messages.FirstUnseen + " is first unseen\r\n";
response += "* OK [UIDVALIDITY " + m_Messages.MailboxUID + "] UIDs valid\r\n";
response += "* OK [UIDNEXT " + m_Messages.UID_Next + "] Predicted next UID\r\n";
response += "* OK [PERMANENTFLAGS (\\Answered \\Flagged \\Deleted \\Seen \\Draft)] Available permanent flags\r\n";
response += cmdTag + " OK [" + (m_Messages.ReadOnly ? "READ-ONLY" : "READ-WRITE") + "] SELECT Completed\r\n";
m_pSocket.SendData(response);
}
else{
m_pSocket.SendLine(cmdTag + " NO " + messages.ErrorText);
}
}
private void Noop(string cmdTag)
{
/* RFC 3501 6.1.2 NOOP Command
Arguments: none
Responses: no specific responses for this command (but see below)
Result: OK - noop completed
BAD - command unknown or arguments invalid
The NOOP command always succeeds. It does nothing.
Since any command can return a status update as untagged data, the
NOOP command can be used as a periodic poll for new messages or
message status updates during a period of inactivity. The NOOP
command can also be used to reset any inactivity autologout timer
on the server.
Example: C: a002 NOOP
S: a002 OK NOOP completed
*/
// If there is selected mailobx, see if messages status has changed
if(m_SelectedMailbox.Length > 0){
// Get status
IMAP_Messages messages = m_pServer.OnGetMessagesInfo(this,m_SelectedMailbox);
// messages status has changed
if(messages.Count != m_Messages.Count || messages.RecentCount != m_Messages.RecentCount){
m_Messages = messages;
string reply = "";
reply += "* " + m_Messages.Count + " EXISTS\r\n";
reply += "* " + m_Messages.RecentCount + " RECENT\r\n";
m_pSocket.SendData(reply);
}
}
m_pSocket.SendLine(cmdTag + " OK NOOP completed");
}
private void Expunge(string cmdTag)
{
/* RFC 3501 6.4.3 EXPUNGE Command
Arguments: none
Responses: untagged responses: EXPUNGE
Result: OK - expunge completed
NO - expunge failure: can't expunge (e.g., permission
denied)
BAD - command unknown or arguments invalid
The EXPUNGE command permanently removes all messages that have the
\Deleted flag set from the currently selected mailbox. Before
returning an OK to the client, an untagged EXPUNGE response is
sent for each message that is removed.
The EXPUNGE response reports that the specified message sequence
number has been permanently removed from the mailbox. The message
sequence number for each successive message in the mailbox is
IMMEDIATELY DECREMENTED BY 1, and this decrement is reflected in
message sequence numbers in subsequent responses (including other
untagged EXPUNGE responses).
Example: C: A202 EXPUNGE
S: * 3 EXPUNGE
S: * 3 EXPUNGE
S: * 5 EXPUNGE
S: * 8 EXPUNGE
S: A202 OK EXPUNGE completed
Note: In this example, messages 3, 4, 7, and 11 had the
\Deleted flag set. See the description of the EXPUNGE
response for further explanation.
*/
if(!m_Authenticated){
m_pSocket.SendLine(cmdTag + " NO Authenticate first !");
return;
}
if(m_SelectedMailbox.Length == 0){
m_pSocket.SendLine(cmdTag + " NO Select mailbox first !");
return;
}
IMAP_Message[] messages = m_Messages.GetDeleteMessages();
for(int i=0;i<messages.Length;i++){
IMAP_Message msg = messages[i];
string errorText = m_pServer.OnDeleteMessage(this,msg);
if(errorText == null){
m_pSocket.SendLine("* " + msg.MessageNo + " EXPUNGE");
m_Messages.RemoveMessage(msg);
}
else{
m_pSocket.SendLine(cmdTag + " NO " + errorText);
return;
}
}
// Refresh m_Messages to reflect deletion
m_Messages = m_pServer.OnGetMessagesInfo(this,this.SelectedMailbox);
m_pSocket.SendLine(cmdTag + " OK EXPUNGE completed");
}
private void Close(string cmdTag)
{
/* RFC 3501 6.4.2 CLOSE Command
Arguments: none
Responses: no specific responses for this command
Result: OK - close completed, now in authenticated state
BAD - command unknown or arguments invalid
The CLOSE command permanently removes from the currently selected
mailbox all messages that have the \Deleted flag set, and returns
to authenticated state from selected state. No untagged EXPUNGE
responses are sent.
No messages are removed, and no error is given, if the mailbox is
selected by an EXAMINE command or is otherwise selected read-only.
Even if a mailbox is selected, a SELECT, EXAMINE, or LOGOUT
command MAY be issued without previously issuing a CLOSE command.
The SELECT, EXAMINE, and LOGOUT commands implicitly close the
currently selected mailbox without doing an expunge. However,
when many messages are deleted, a CLOSE-LOGOUT or CLOSE-SELECT
sequence is considerably faster than an EXPUNGE-LOGOUT or
EXPUNGE-SELECT because no untagged EXPUNGE responses (which the
client would probably ignore) are sent.
Example: C: A341 CLOSE
S: A341 OK CLOSE completed
*/
if(!m_Authenticated){
m_pSocket.SendLine(cmdTag + " NO Authenticate first !");
return;
}
if(m_SelectedMailbox.Length == 0){
m_pSocket.SendLine(cmdTag + " NO Select mailbox first !");
return;
}
if(!m_Messages.ReadOnly){
IMAP_Message[] messages = m_Messages.GetDeleteMessages();
foreach(IMAP_Message msg in messages){
m_pServer.OnDeleteMessage(this,msg);
}
}
m_SelectedMailbox = "";
m_Messages = null;
m_pSocket.SendLine(cmdTag + " OK CLOSE completed");
}