/*
* The UID command has two forms. In the first form, it takes as its
* arguments a COPY, FETCH, or STORE command with arguments
* appropriate for the associated command. However, the numbers in
* the sequence set argument are unique identifiers instead of
* message sequence numbers. Sequence set ranges are permitted, but
* there is no guarantee that unique identifiers will be contiguous...
*
* In the second form, the UID command takes a SEARCH command with
* SEARCH command arguments. The interpretation of the arguments is
* the same as with SEARCH; however, the numbers returned in a SEARCH
* response for a UID SEARCH command are unique identifiers instead of message sequence numbers.
*/
public static void UID(string command, Connection connectionState)
{
var tag = command.Split(' ').First();
if (connectionState.SelectedState)
{
if (command.ToLower().Contains("fetch"))
{
if (IMAP_Fetch.TryFetch(command, connectionState, true))
{
connectionState.SendToStream($"{tag} OK UID FETCH completed");
}
}
else if (command.ToLower().Contains("search"))
{
var commandParams = IMAP_Fetch.ParseFetchCommand(command);
var messagesNums = IMAP_Search.Search(commandParams.Skip(1).ToArray(), connectionState);
if (messagesNums.First() != -1)
{
string response = "";
foreach (var messageNum in messagesNums)
{
foreach (var message in connectionState.SelectedMailBox.EmailMessages)
{
if (message.MsgNum == messageNum)
{
response += $"{message.MessageId} ";
break;
}
}
}
connectionState.SendToStream($"* SEARCH {response}");
connectionState.SendToStream($"{command[0]} OK UID completed");
}
else
{
connectionState.SendToStream($"{command[0]} BAD - this command is not supported");
}
}
}
else
{
connectionState.SendToStream($"{tag} BAD - command unknown or arguments invalid");
}
}
/*
* The FETCH command retrieves data associated with a message in the
* mailbox. The data items to be fetched can be either a single atom
* or a parenthesized list.
* Most data items, identified in the formal syntax under the
* msg-att-static rule, are static and MUST NOT change for any
* particular message. Other data items, identified in the formal
* syntax under the msg-att-dynamic rule, MAY change, either as a
* result of a STORE command or due to external events.
* For example, if a client receives an ENVELOPE for a
* message when it already knows the envelope, it can
* safely ignore the newly transmitted envelope.
* There are three macros which specify commonly-used sets of data
* items, and can be used instead of data items. A macro must be
* used by itself, and not in conjunction with other macros or data
* items.
*/
public static void Fetch(string command, Connection connectionState)
{
var tag = command.Split(' ').First();
if (connectionState.SelectedState)
{
if (IMAP_Fetch.TryFetch(command, connectionState, false))
{
connectionState.SendToStream($"{tag} OK FETCH completed");
}
else
{
connectionState.SendToStream($"{tag} NO - fetch error: can’t fetch that data");
}
}
else
{
connectionState.SendToStream($"{tag} BAD - command unknown or arguments invalid");
}
}
