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use std::ffi::OsStr;
use std::fs;
use std::fs::{File, OpenOptions};
use std::io::Write;
use std::path::Path;
use crate::constant::{permission, scp};
use crate::error::{SshError, SshErrorKind, SshResult};
use crate::slog::log;
use crate::channel_scp::{ChannelScp, ScpFile, check_path};
use crate::util;
impl ChannelScp {
pub fn download<S: AsRef<OsStr> + ?Sized>(&mut self, local_path: &S, remote_path: &S) -> SshResult<()> {
let local_path = Path::new(local_path);
let remote_path = Path::new(remote_path);
check_path(local_path)?;
check_path(remote_path)?;
let local_path_str = local_path.to_str().unwrap();
let remote_path_str = remote_path.to_str().unwrap();
self.local_path = local_path.to_path_buf();
log::info!("start to download files, \
remote [{}] files will be synchronized to the local [{}] folder.", remote_path_str, local_path_str);
self.exec_scp(self.command_init(remote_path_str, scp::SOURCE).as_str())?;
let mut scp_file = ScpFile::new();
scp_file.local_path = self.local_path.clone();
self.process_d(&mut scp_file)?;
Ok(())
}
fn process_d(&mut self, scp_file: &mut ScpFile) -> SshResult<()> {
loop {
self.send_end()?;
let data = self.read_data()?;
if data.is_empty() {
break;
}
let code = &data[0];
match *code {
scp::T => {
let (modify_time, access_time) = file_time(data)?;
scp_file.modify_time = modify_time;
scp_file.access_time = access_time;
}
scp::C => self.process_file_d(data, scp_file)?,
scp::D => self.process_dir_d(data, scp_file)?,
scp::E => {
match scp_file.local_path.parent() {
None => {}
Some(v) => {
let buf = v.to_path_buf();
if !buf.eq(&self.local_path) {
scp_file.local_path = buf;
}
}
}
}
scp::ERR | scp::FATAL_ERR =>
return Err(SshError::from(SshErrorKind::ScpError(util::from_utf8(data)?))),
_ => return Err(SshError::from(SshErrorKind::ScpError("unknown error.".to_string())))
}
}
log::info!("files download successful.");
Ok(())
}
fn process_dir_d(&mut self, data: Vec<u8>, scp_file: &mut ScpFile) -> SshResult<()> {
let string = util::from_utf8(data)?;
let dir_info = string.trim();
let split = dir_info.split(" ").collect::<Vec<&str>>();
match split.get(2) {
None => return Ok(()),
Some(v) => scp_file.name = v.to_string()
}
scp_file.is_dir = true;
let buf = scp_file.local_path.join(&scp_file.name);
log::debug!("name: [{}] size: [0], type: [dir] start download.", scp_file.name);
if !buf.exists() {
fs::create_dir(buf.as_path())?;
}
scp_file.local_path = buf;
match File::open(scp_file.local_path.as_path()) {
Ok(file) => {
self.sync_permissions(scp_file, file);
}
Err(e) => {
log::error!("failed to open the folder, \
it is possible that the path does not exist, \
which does not affect subsequent operations. \
error info: {:?}", e);
return Err(SshError::from(SshErrorKind::ScpError(format!("file open error: {}", e.to_string()))))
}
};
log::debug!("dir: [{}] download completed.", scp_file.name);
Ok(())
}
fn process_file_d(&mut self, data: Vec<u8>, scp_file: &mut ScpFile) -> SshResult<()> {
let string = util::from_utf8(data)?;
let file_info = string.trim();
let split = file_info.split(" ").collect::<Vec<&str>>();
let size_str = *split.get(1).unwrap_or(&"0");
let size = util::str_to_i64(size_str)?;
scp_file.size = size as u64;
match split.get(2) {
None => return Ok(()),
Some(v) => scp_file.name = v.to_string()
}
scp_file.is_dir = false;
self.save_file(scp_file)?;
Ok(())
}
fn save_file(&mut self, scp_file: &mut ScpFile) -> SshResult<()> {
log::debug!("name: [{}] size: [{}] type: [file] start download.", scp_file.name, scp_file.size);
let path = scp_file.local_path.join(scp_file.name.as_str());
if path.exists() {
fs::remove_file(path.as_path())?;
}
let mut file = match OpenOptions::new()
.write(true)
.append(true)
.create(true)
.open(path.as_path()) {
Ok(v) => v,
Err(e) => {
log::error!("file processing error, error info: {}", e);
return Err(SshError::from(SshErrorKind::ScpError(format!("{:?} file processing exception", path))))
}
};
self.send_end()?;
let mut count = 0;
loop {
let data = self.read_data()?;
if data.is_empty() { continue }
count += data.len() as u64;
if count == scp_file.size + 1 {
if let Err(e) = file.write_all(&data[..(data.len() - 1)]) {
return Err(SshError::from(e))
}
break;
}
if let Err(e) = file.write_all(&data) {
return Err(SshError::from(e))
}
}
self.sync_permissions(scp_file, file);
log::debug!("file: [{}] download completed.", scp_file.name);
Ok(())
}
fn sync_permissions(&self, scp_file: &mut ScpFile, file: File) {
let modify_time = filetime::FileTime::from_unix_time(scp_file.modify_time, 0);
let access_time = filetime::FileTime::from_unix_time(scp_file.access_time, 0);
if let Err(e) = filetime::set_file_times(scp_file.local_path.as_path(), access_time, modify_time) {
log::error!("the file time synchronization is abnormal,\
which may be caused by the operating system,\
which does not affect subsequent operations.\
error info: {:?}", e)
}
#[cfg(any(target_os = "linux", target_os = "macos"))]
{
use std::os::unix::fs::PermissionsExt;
match u32::from_str_radix(match scp_file.is_dir {
true => permission::DIR,
false => permission::FILE
}, 8) {
Ok(mode) => {
if let Err(_) = file.set_permissions(fs::Permissions::from_mode(mode)) {
log::error!("the operating system does not allow modification of file permissions, \
which does not affect subsequent operations.");
}
}
Err(v) => {
log::error!("Unknown error {}", v)
}
}
}
}
}
fn file_time(v: Vec<u8>) -> SshResult<(i64, i64)> {
let mut t = vec![];
for x in v {
if x == 'T' as u8
|| x == 32
|| x == 10 {
continue
}
t.push(x)
}
let a = t.len() / 2;
let ct = util::from_utf8((&t[..(a - 1)]).to_vec())?;
let ut = util::from_utf8((&t[a..(t.len() -1)]).to_vec())?;
Ok((util::str_to_i64(&ct)?, util::str_to_i64(&ut)?))
}
