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use crate::file::{FdFlags, FileCaps, FileType, Filestat, OFlags, WasiFile};
use crate::{Error, ErrorExt, SystemTimeSpec};
use bitflags::bitflags;
use std::any::Any;
use std::path::PathBuf;
#[wiggle::async_trait]
pub trait WasiDir: Send + Sync {
fn as_any(&self) -> &dyn Any;
async fn open_file(
&self,
symlink_follow: bool,
path: &str,
oflags: OFlags,
read: bool,
write: bool,
fdflags: FdFlags,
) -> Result<Box<dyn WasiFile>, Error>;
async fn open_dir(&self, symlink_follow: bool, path: &str) -> Result<Box<dyn WasiDir>, Error>;
async fn create_dir(&self, path: &str) -> Result<(), Error>;
async fn readdir(
&self,
cursor: ReaddirCursor,
) -> Result<Box<dyn Iterator<Item = Result<ReaddirEntity, Error>> + Send>, Error>;
async fn symlink(&self, old_path: &str, new_path: &str) -> Result<(), Error>;
async fn remove_dir(&self, path: &str) -> Result<(), Error>;
async fn unlink_file(&self, path: &str) -> Result<(), Error>;
async fn read_link(&self, path: &str) -> Result<PathBuf, Error>;
async fn get_filestat(&self) -> Result<Filestat, Error>;
async fn get_path_filestat(&self, path: &str, follow_symlinks: bool)
-> Result<Filestat, Error>;
async fn rename(
&self,
path: &str,
dest_dir: &dyn WasiDir,
dest_path: &str,
) -> Result<(), Error>;
async fn hard_link(
&self,
path: &str,
target_dir: &dyn WasiDir,
target_path: &str,
) -> Result<(), Error>;
async fn set_times(
&self,
path: &str,
atime: Option<SystemTimeSpec>,
mtime: Option<SystemTimeSpec>,
follow_symlinks: bool,
) -> Result<(), Error>;
}
pub(crate) struct DirEntry {
caps: DirCaps,
file_caps: FileCaps,
preopen_path: Option<PathBuf>,
dir: Box<dyn WasiDir>,
}
impl DirEntry {
pub fn new(
caps: DirCaps,
file_caps: FileCaps,
preopen_path: Option<PathBuf>,
dir: Box<dyn WasiDir>,
) -> Self {
DirEntry {
caps,
file_caps,
preopen_path,
dir,
}
}
pub fn capable_of_dir(&self, caps: DirCaps) -> Result<(), Error> {
if self.caps.contains(caps) {
Ok(())
} else {
let missing = caps & !self.caps;
let err = if missing.intersects(DirCaps::READDIR) {
Error::not_dir()
} else {
Error::perm()
};
Err(err.context(format!("desired rights {:?}, has {:?}", caps, self.caps)))
}
}
pub fn capable_of_file(&self, caps: FileCaps) -> Result<(), Error> {
if self.file_caps.contains(caps) {
Ok(())
} else {
Err(Error::perm().context(format!(
"desired rights {:?}, has {:?}",
caps, self.file_caps
)))
}
}
pub fn drop_caps_to(&mut self, caps: DirCaps, file_caps: FileCaps) -> Result<(), Error> {
self.capable_of_dir(caps)?;
self.capable_of_file(file_caps)?;
self.caps = caps;
self.file_caps = file_caps;
Ok(())
}
pub fn child_dir_caps(&self, desired_caps: DirCaps) -> DirCaps {
self.caps & desired_caps
}
pub fn child_file_caps(&self, desired_caps: FileCaps) -> FileCaps {
self.file_caps & desired_caps
}
pub fn get_dir_fdstat(&self) -> DirFdStat {
DirFdStat {
dir_caps: self.caps,
file_caps: self.file_caps,
}
}
pub fn preopen_path(&self) -> &Option<PathBuf> {
&self.preopen_path
}
}
pub trait DirEntryExt {
fn get_cap(&self, caps: DirCaps) -> Result<&dyn WasiDir, Error>;
}
impl DirEntryExt for DirEntry {
fn get_cap(&self, caps: DirCaps) -> Result<&dyn WasiDir, Error> {
self.capable_of_dir(caps)?;
Ok(&*self.dir)
}
}
bitflags! {
pub struct DirCaps: u32 {
const CREATE_DIRECTORY = 0b1;
const CREATE_FILE = 0b10;
const LINK_SOURCE = 0b100;
const LINK_TARGET = 0b1000;
const OPEN = 0b10000;
const READDIR = 0b100000;
const READLINK = 0b1000000;
const RENAME_SOURCE = 0b10000000;
const RENAME_TARGET = 0b100000000;
const SYMLINK = 0b1000000000;
const REMOVE_DIRECTORY = 0b10000000000;
const UNLINK_FILE = 0b100000000000;
const PATH_FILESTAT_GET = 0b1000000000000;
const PATH_FILESTAT_SET_TIMES = 0b10000000000000;
const FILESTAT_GET = 0b100000000000000;
const FILESTAT_SET_TIMES = 0b1000000000000000;
}
}
#[derive(Debug, Clone)]
pub struct DirFdStat {
pub file_caps: FileCaps,
pub dir_caps: DirCaps,
}
pub(crate) trait TableDirExt {
fn get_dir(&self, fd: u32) -> Result<&DirEntry, Error>;
fn is_preopen(&self, fd: u32) -> bool;
}
impl TableDirExt for crate::table::Table {
fn get_dir(&self, fd: u32) -> Result<&DirEntry, Error> {
self.get(fd)
}
fn is_preopen(&self, fd: u32) -> bool {
if self.is::<DirEntry>(fd) {
let dir_entry: &DirEntry = self.get(fd).unwrap();
dir_entry.preopen_path.is_some()
} else {
false
}
}
}
#[derive(Debug, Clone)]
pub struct ReaddirEntity {
pub next: ReaddirCursor,
pub inode: u64,
pub name: String,
pub filetype: FileType,
}
#[derive(Debug, Copy, Clone)]
pub struct ReaddirCursor(u64);
impl From<u64> for ReaddirCursor {
fn from(c: u64) -> ReaddirCursor {
ReaddirCursor(c)
}
}
impl From<ReaddirCursor> for u64 {
fn from(c: ReaddirCursor) -> u64 {
c.0
}
}
