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use super::error::Error;
use async_trait::async_trait;
use chrono::prelude::{DateTime, Utc};
use itertools::Itertools;
use log::warn;
use std::{
fmt::{self, Debug, Formatter},
path::Path,
result,
time::SystemTime,
};
use tokio::io::AsyncRead;
pub const FEATURE_RESTART: u32 = 0b0000_0001;
pub type Result<T> = result::Result<T, Error>;
pub trait Metadata {
fn len(&self) -> u64;
fn is_empty(&self) -> bool {
self.len() == 0
}
fn is_dir(&self) -> bool;
fn is_file(&self) -> bool;
fn is_symlink(&self) -> bool;
fn modified(&self) -> Result<SystemTime>;
fn gid(&self) -> u32;
fn uid(&self) -> u32;
}
#[derive(Clone)]
pub struct Fileinfo<P, M>
where
P: AsRef<Path>,
M: Metadata,
{
pub path: P,
pub metadata: M,
}
impl<P, M> std::fmt::Display for Fileinfo<P, M>
where
P: AsRef<Path>,
M: Metadata,
{
fn fmt(&self, f: &mut Formatter) -> fmt::Result {
let modified: String = self
.metadata
.modified()
.map(|x| DateTime::<Utc>::from(x).format("%b %d %H:%M").to_string())
.unwrap_or_else(|_| "-".to_string());
let basename = self.path.as_ref().components().last();
let path = match basename {
Some(v) => v.as_os_str().to_string_lossy(),
None => {
warn!("error parsing path components");
return Err(std::fmt::Error);
}
};
#[allow(clippy::write_literal)]
write!(
f,
"{filetype}{permissions} {owner:>12} {group:>12} {size:#14} {modified:>12} {path}",
filetype = if self.metadata.is_dir() {
"d"
} else if self.metadata.is_symlink() {
"l"
} else {
"-"
},
permissions = "rwxr-xr-x",
owner = self.metadata.uid(),
group = self.metadata.gid(),
size = self.metadata.len(),
modified = modified,
path = path,
)
}
}
#[async_trait]
pub trait StorageBackend<U: Sync + Send + Debug>: Send + Sync + Debug {
type File: AsyncRead + Sync + Send + Unpin;
type Metadata: Metadata + Sync + Send;
fn supported_features(&self) -> u32 {
0
}
async fn metadata<P: AsRef<Path> + Send + Debug>(&self, user: &Option<U>, path: P) -> Result<Self::Metadata>;
async fn list<P: AsRef<Path> + Send + Debug>(&self, user: &Option<U>, path: P) -> Result<Vec<Fileinfo<std::path::PathBuf, Self::Metadata>>>
where
<Self as StorageBackend<U>>::Metadata: Metadata;
#[allow(clippy::type_complexity)]
#[tracing_attributes::instrument]
async fn list_fmt<P>(&self, user: &Option<U>, path: P) -> std::result::Result<std::io::Cursor<Vec<u8>>, Error>
where
P: AsRef<Path> + Send + Debug,
Self::Metadata: Metadata + 'static,
{
let list = self.list(user, path).await?;
let file_infos: Vec<u8> = list.iter().map(|fi| format!("{}\r\n", fi).into_bytes()).concat();
Ok(std::io::Cursor::new(file_infos))
}
#[allow(clippy::type_complexity)]
#[tracing_attributes::instrument]
async fn nlst<P>(&self, user: &Option<U>, path: P) -> std::result::Result<std::io::Cursor<Vec<u8>>, std::io::Error>
where
P: AsRef<Path> + Send + Debug,
Self::Metadata: Metadata + 'static,
{
let list = self.list(user, path).await.map_err(|_| std::io::Error::from(std::io::ErrorKind::Other))?;
let bytes = list
.iter()
.map(|file| {
let info = file.path.file_name().unwrap_or_else(|| std::ffi::OsStr::new("")).to_str().unwrap_or("");
format!("{}\r\n", info).into_bytes()
})
.concat();
Ok(std::io::Cursor::new(bytes))
}
async fn get<P: AsRef<Path> + Send + Debug>(&self, user: &Option<U>, path: P, start_pos: u64) -> Result<Self::File>;
async fn put<P: AsRef<Path> + Send + Debug, R: tokio::io::AsyncRead + Send + Sync + Unpin + 'static>(
&self,
user: &Option<U>,
input: R,
path: P,
start_pos: u64,
) -> Result<u64>;
async fn del<P: AsRef<Path> + Send + Debug>(&self, user: &Option<U>, path: P) -> Result<()>;
async fn mkd<P: AsRef<Path> + Send + Debug>(&self, user: &Option<U>, path: P) -> Result<()>;
async fn rename<P: AsRef<Path> + Send + Debug>(&self, user: &Option<U>, from: P, to: P) -> Result<()>;
async fn rmd<P: AsRef<Path> + Send + Debug>(&self, user: &Option<U>, path: P) -> Result<()>;
async fn cwd<P: AsRef<Path> + Send + Debug>(&self, user: &Option<U>, path: P) -> Result<()>;
}