Uploading files

Now, let's do the opposite command: STOR to upload a file on the server.

As always, we'll add a case in the handle_cmd() method:

#[async]
fn handle_cmd(mut self, cmd: Command) -> Result<Self> {
    match cmd {
        Command::Stor(file) => self = await!(self.stor(file))?,
        // …
    }
}

Here is the start of the corresponding method:

use std::io::Write;

#[async]
fn stor(mut self, path: PathBuf) -> Result<Self> {
    if self.data_reader.is_some() {
        if invalid_path(&path) {
            let error: io::Error = io::ErrorKind::PermissionDenied.into();
            return Err(error.into());
        }
        let path = self.cwd.join(path);
        self = await!(self.send(Answer::new(ResultCode::DataConnectionAlreadyOpen, 
         "Starting to send file...")))?;

Once again, we check that the data channel is opened. Then, we use a new function to check that the path is valid, by which we mean it does not contain ... In the other cases, we used another...