/// <summary>
/// Deletes specified message from recycle bin.
/// </summary>
/// <param name="messageID">Message ID which to restore.</param>
public static void DeleteRecycleBinMessage(string messageID)
{
using(FileStream fs = GetFile()){
int delRowCount = 0;
StreamLineReader r = new StreamLineReader(fs);
long pos = fs.Position;
string line = r.ReadLineString();
while(line != null){
// Skip comment lines
if(!line.StartsWith("#")){
// Skip deleted row
if(line.StartsWith("\0")){
delRowCount++;
}
else{
string[] row = TextUtils.SplitQuotedString(line,' ');
// Delete row
if(row[0] == messageID){
string user = row[2];
string folder = TextUtils.UnQuoteString(row[3]);
// Delete message
File.Delete(m_RecycleBinPath + messageID + ".eml");
// Delete row
byte[] linebytes = new byte[fs.Position - pos - 2];
fs.Position = pos;
fs.Write(linebytes,0,linebytes.Length);
fs.Position += 2; // CRLF
delRowCount++;
break;
}
}
}
pos = fs.Position;
line = r.ReadLineString();
}
// There are many deleted rows, vacuum(remove deleted rows) flags database.
if(delRowCount > 500){
Vacuum(fs);
}
}
}
/// <summary>
/// Deletes specified message all users flags.
/// </summary>
/// <param name="folder">Folder.</param>
/// <param name="uid">Message UID.</param>
public static void DeleteFlags(string folder,int uid)
{
using(FileStream fs = GetFlagsFile(null,folder)){
int delRowCount = 0;
StreamLineReader r = new StreamLineReader(fs);
long pos = fs.Position;
string line = r.ReadLineString();
while(line != null){
// Skip comment lines
if(!line.StartsWith("#")){
// Skip deleted row
if(line.StartsWith("\0")){
delRowCount++;
}
else{
string[] userID_uid_flags = line.Split(' ');
// Delete row
if(Convert.ToInt32(userID_uid_flags[1]) == uid){
byte[] linebytes = new byte[fs.Position - pos - 2];
fs.Position = pos;
fs.Write(linebytes,0,linebytes.Length);
fs.Position += 2; // CRLF
delRowCount++;
}
}
}
pos = fs.Position;
line = r.ReadLineString();
}
// There are many deleted rows, vacuum(remove deleted rows) flags database.
if(delRowCount > 500){
Vacuum(fs);
}
}
}
/// <summary>
/// Default constructor.
/// </summary>
/// <param name="fs">Message file stream.</param>
public _InternalHeader(FileStream fs)
{
m_pFile = fs;
StreamLineReader r = new StreamLineReader(fs);
string line = r.ReadLineString();
if(line!= null && line.ToLower() == "<internalheader>"){
line = r.ReadLineString();
while(line.ToLower() != "</internalheader>"){
if(line.ToLower().StartsWith("#-messageflags:")){
m_MessageFlags = (IMAP_MessageFlags)Enum.Parse(typeof(IMAP_MessageFlags),line.Substring(15).Trim());
}
else if(line.ToLower().StartsWith("#-envelope:")){
m_Envelope = line.Substring(11).Trim();
}
else if(line.ToLower().StartsWith("#-body:")){
m_Body = line.Substring(7).Trim();
}
line = r.ReadLineString();
}
// Remove internal header
if(fs.CanWrite){
byte[] data = new byte[fs.Length - fs.Position];
fs.Read(data,0,data.Length);
fs.Position = 0;
fs.Write(data,0,data.Length);
fs.SetLength(data.Length);
fs.Position = 0;
}
}
// Internal header doesn't exist
else{
fs.Position = 0;
}
}
/// <summary>
/// Vacuums flags database, deletes deleted rows empty used space from file.
/// </summary>
/// <param name="fs">Database file stream.</param>
private static void Vacuum(FileStream fs)
{
MemoryStream buffer = new MemoryStream();
fs.Position = 0;
StreamLineReader r = new StreamLineReader(fs);
string line = r.ReadLineString();
while(line != null){
// Skip deleted rows
if(!line.StartsWith("\0")){
byte[] lineBytes = System.Text.Encoding.ASCII.GetBytes(line + "\r\n");
buffer.Write(lineBytes,0,lineBytes.Length);
}
line = r.ReadLineString();
}
fs.SetLength(buffer.Length);
fs.Position = 0;
buffer.WriteTo(fs);
}
/// <summary>
/// Restores specified message from recycle bin.
/// </summary>
/// <param name="messageID">Message ID which to restore.</param>
/// <param name="api">Reference to API.</param>
public static void RestoreFromRecycleBin(string messageID,IMailServerApi api)
{
using(FileStream fs = GetFile()){
int delRowCount = 0;
StreamLineReader r = new StreamLineReader(fs);
long pos = fs.Position;
string line = r.ReadLineString();
while(line != null){
// Skip comment lines
if(!line.StartsWith("#")){
// Skip deleted row
if(line.StartsWith("\0")){
delRowCount++;
}
else{
string[] row = TextUtils.SplitQuotedString(line,' ');
// Delete row
if(row[0] == messageID){
string user = row[2];
string folder = TextUtils.UnQuoteString(row[3]);
// Store message back to original user folder
using(FileStream stream = File.OpenRead(m_RecycleBinPath + messageID + ".eml")){
// If folder doesn't exist, create it
if(!api.FolderExists(user + "/" + folder)){
api.CreateFolder("system",user,folder);
}
api.StoreMessage("system",user,folder,stream,DateTime.Now,new string[]{"Recent"});
}
// Delete row
byte[] linebytes = new byte[fs.Position - pos - 2];
fs.Position = pos;
fs.Write(linebytes,0,linebytes.Length);
fs.Position += 2; // CRLF
delRowCount++;
// Delete recycle bin message
File.Delete(m_RecycleBinPath + messageID + ".eml");
break;
}
}
}
pos = fs.Position;
line = r.ReadLineString();
}
// There are many deleted rows, vacuum(remove deleted rows) flags database.
if(delRowCount > 500){
Vacuum(fs);
}
}
}
/// <summary>
/// Gets recycle bin message stream. NOTE: This method caller must take care of closing stream.
/// </summary>
/// <param name="messageID">Message ID if of message what to get.</param>
/// <returns></returns>
public static Stream GetRecycleBinMessage(string messageID)
{
using(FileStream fs = GetFile()){
int delRowCount = 0;
StreamLineReader r = new StreamLineReader(fs);
long pos = fs.Position;
string line = r.ReadLineString();
while(line != null){
// Skip comment lines
if(!line.StartsWith("#")){
// Skip deleted row
if(line.StartsWith("\0")){
delRowCount++;
}
else{
string[] row = TextUtils.SplitQuotedString(line,' ');
// Delete row
if(row[0] == messageID){
string user = row[2];
string folder = TextUtils.UnQuoteString(row[3]);
// Store message back to original user folder
FileStream stream = File.OpenRead(m_RecycleBinPath + messageID + ".eml");
return stream;
}
}
}
pos = fs.Position;
line = r.ReadLineString();
}
}
throw new Exception("Specified message doesn't exist !");
}
/// <summary>
/// Sets specified message flags for specified user.
/// </summary>
/// <param name="userID">User ID.</param>
/// <param name="folder">Folder.</param>
/// <param name="uid">Message UID.</param>
/// <param name="flags">Message flags.</param>
public static void SetFlags(string userID,string folder,int uid,IMAP_MessageFlags flags)
{
using(FileStream fs = GetFlagsFile(userID,folder)){
StreamLineReader r = new StreamLineReader(fs);
long pos = fs.Position;
string line = r.ReadLineString();
while(line != null){
// Skip comment lines
if(!line.StartsWith("#")){
string[] userID_uid_flags = line.Split(' ');
// Update user message flags
if(userID_uid_flags[0] == userID && Convert.ToInt32(userID_uid_flags[1]) == uid){
fs.Position = pos;
byte[] record1 = System.Text.Encoding.ASCII.GetBytes(userID + " " + uid.ToString("d10") + " " + ((int)flags).ToString("d4") + "\r\n");
fs.Write(record1,0,record1.Length);
return;
}
}
pos = fs.Position;
line = r.ReadLineString();
}
// If we reach here, then specified user has no flags for specified message, add new record.
byte[] record = System.Text.Encoding.ASCII.GetBytes(userID + " " + uid.ToString("d10") + " " + ((int)flags).ToString("d4") + "\r\n");
fs.Write(record,0,record.Length);
}
}
