public static Task WriteStatusAsync(this ImapStream stream, string status, string message)
{
return(stream.WriteLineAsync(status + " " + message));
}
/// <summary>
/// https://tools.ietf.org/html/rfc3501#section-2.2.1
/// https://tools.ietf.org/html/rfc3501#section-4.3
/// </summary>
public static async Task <CommandLine> ReadCommandAsync(this ImapStream stream)
{
var line = await stream.ReadLineAsync();
while (String.IsNullOrEmpty(line))
{
await stream.WriteLineAsync("* BAD Empty command line");
line = await stream.ReadLineAsync();
}
var spl = line.Split(new char[] { ' ' }, 3);
// No command name
if (spl.Length < 2)
{
return(null);
}
var result = new CommandLine
{
Tag = spl[0],
Name = spl[1].ToUpperInvariant()
};
// No argument
if (spl.Length < 3)
{
return(result);
}
// Rest part as default argument
result.Args = spl[2];
// APPEND is special to handle later
if (result.Name == "APPEND")
{
return(result);
}
var partialArgs = ArgumentUtility.Parse(result.Args);
// One line command
if (partialArgs.Size == null)
{
return(result);
}
/* Continous command
* R <tag> <command> <partial argument>{<continue size>}
* W + Continue.
* R ...
* R <partial argument>{<continue size>}
* W + Continue.
* R ...
* R <end argument>
*/
var builder = new StringBuilder();
while (partialArgs.Size != null)
{
builder.Append(partialArgs.Args);
await stream.WriteLineAsync("+ Continue.");
// Read bytes secified by literal {size}
var bytes = await stream.ReadAsync(partialArgs.Size.Value);
builder.Append(TextUtils.QuoteString(Encoding.UTF8.GetString(bytes)));
// Try to read last line
line = await stream.ReadLineAsync();
partialArgs = ArgumentUtility.Parse(line);
}
builder.Append(partialArgs.Args);
result.Args = builder.ToString();
return(result);
}