/
mod.rs
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/
mod.rs
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// Copyright 2019-2023 Tauri Programme within The Commons Conservancy
// SPDX-License-Identifier: Apache-2.0
// SPDX-License-Identifier: MIT
use std::{
env::temp_dir,
path::{Component, Display, Path, PathBuf},
};
use crate::{
plugin::{Builder, TauriPlugin},
Manager, Runtime,
};
use serde::{de::Error as DeError, Deserialize, Deserializer};
use serde_repr::{Deserialize_repr, Serialize_repr};
#[cfg(any(path_all, test))]
mod commands;
mod error;
pub use error::*;
#[cfg(target_os = "android")]
mod android;
#[cfg(not(target_os = "android"))]
mod desktop;
#[cfg(target_os = "android")]
pub(crate) use android::PathResolver;
#[cfg(not(target_os = "android"))]
pub(crate) use desktop::PathResolver;
/// A wrapper for [`PathBuf`] that prevents path traversal.
#[derive(Clone, Debug)]
pub struct SafePathBuf(PathBuf);
impl SafePathBuf {
/// Validates the path for directory traversal vulnerabilities and returns a new [`SafePathBuf`] instance if it is safe.
pub fn new(path: PathBuf) -> std::result::Result<Self, &'static str> {
if path.components().any(|x| matches!(x, Component::ParentDir)) {
Err("cannot traverse directory, rewrite the path without the use of `../`")
} else {
Ok(Self(path))
}
}
/// Returns an object that implements [`std::fmt::Display`] for safely printing paths.
///
/// See [`PathBuf#method.display`] for more information.
pub fn display(&self) -> Display<'_> {
self.0.display()
}
}
impl AsRef<Path> for SafePathBuf {
fn as_ref(&self) -> &Path {
self.0.as_ref()
}
}
impl<'de> Deserialize<'de> for SafePathBuf {
fn deserialize<D>(deserializer: D) -> std::result::Result<Self, D::Error>
where
D: Deserializer<'de>,
{
let path = PathBuf::deserialize(deserializer)?;
SafePathBuf::new(path).map_err(DeError::custom)
}
}
/// A base directory to be used in [`resolve_directory`].
///
/// The base directory is the optional root of a file system operation.
/// If informed by the API call, all paths will be relative to the path of the given directory.
///
/// For more information, check the [`dirs_next` documentation](https://docs.rs/dirs_next/).
#[derive(Serialize_repr, Deserialize_repr, Clone, Copy, Debug)]
#[repr(u16)]
#[non_exhaustive]
pub enum BaseDirectory {
/// The Audio directory.
Audio = 1,
/// The Cache directory.
Cache,
/// The Config directory.
Config,
/// The Data directory.
Data,
/// The LocalData directory.
LocalData,
/// The Document directory.
Document,
/// The Download directory.
Download,
/// The Picture directory.
Picture,
/// The Public directory.
Public,
/// The Video directory.
Video,
/// The Resource directory.
Resource,
/// A temporary directory.
/// Resolves to [`temp_dir`].
Temp,
/// The default app config directory.
/// Resolves to [`BaseDirectory::Config`]`/{bundle_identifier}`.
AppConfig,
/// The default app data directory.
/// Resolves to [`BaseDirectory::Data`]`/{bundle_identifier}`.
AppData,
/// The default app local data directory.
/// Resolves to [`BaseDirectory::LocalData`]`/{bundle_identifier}`.
AppLocalData,
/// The default app cache directory.
/// Resolves to [`BaseDirectory::Cache`]`/{bundle_identifier}`.
AppCache,
/// The default app log directory.
/// Resolves to [`BaseDirectory::Home`]`/Library/Logs/{bundle_identifier}` on macOS
/// and [`BaseDirectory::Config`]`/{bundle_identifier}/logs` on linux and Windows.
AppLog,
/// The Desktop directory.
#[cfg(not(target_os = "android"))]
Desktop,
/// The Executable directory.
#[cfg(not(target_os = "android"))]
Executable,
/// The Font directory.
#[cfg(not(target_os = "android"))]
Font,
/// The Home directory.
#[cfg(not(target_os = "android"))]
Home,
/// The Runtime directory.
#[cfg(not(target_os = "android"))]
Runtime,
/// The Template directory.
#[cfg(not(target_os = "android"))]
Template,
}
impl BaseDirectory {
/// Gets the variable that represents this [`BaseDirectory`] for string paths.
pub fn variable(self) -> &'static str {
match self {
Self::Audio => "$AUDIO",
Self::Cache => "$CACHE",
Self::Config => "$CONFIG",
Self::Data => "$DATA",
Self::LocalData => "$LOCALDATA",
Self::Document => "$DOCUMENT",
Self::Download => "$DOWNLOAD",
Self::Picture => "$PICTURE",
Self::Public => "$PUBLIC",
Self::Video => "$VIDEO",
Self::Resource => "$RESOURCE",
Self::Temp => "$TEMP",
Self::AppConfig => "$APPCONFIG",
Self::AppData => "$APPDATA",
Self::AppLocalData => "$APPLOCALDATA",
Self::AppCache => "$APPCACHE",
Self::AppLog => "$APPLOG",
#[cfg(not(target_os = "android"))]
Self::Desktop => "$DESKTOP",
#[cfg(not(target_os = "android"))]
Self::Executable => "$EXE",
#[cfg(not(target_os = "android"))]
Self::Font => "$FONT",
#[cfg(not(target_os = "android"))]
Self::Home => "$HOME",
#[cfg(not(target_os = "android"))]
Self::Runtime => "$RUNTIME",
#[cfg(not(target_os = "android"))]
Self::Template => "$TEMPLATE",
}
}
/// Gets the [`BaseDirectory`] associated with the given variable, or [`None`] if the variable doesn't match any.
pub fn from_variable(variable: &str) -> Option<Self> {
let res = match variable {
"$AUDIO" => Self::Audio,
"$CACHE" => Self::Cache,
"$CONFIG" => Self::Config,
"$DATA" => Self::Data,
"$LOCALDATA" => Self::LocalData,
"$DOCUMENT" => Self::Document,
"$DOWNLOAD" => Self::Download,
"$PICTURE" => Self::Picture,
"$PUBLIC" => Self::Public,
"$VIDEO" => Self::Video,
"$RESOURCE" => Self::Resource,
"$TEMP" => Self::Temp,
"$APPCONFIG" => Self::AppConfig,
"$APPDATA" => Self::AppData,
"$APPLOCALDATA" => Self::AppLocalData,
"$APPCACHE" => Self::AppCache,
"$APPLOG" => Self::AppLog,
#[cfg(not(target_os = "android"))]
"$DESKTOP" => Self::Desktop,
#[cfg(not(target_os = "android"))]
"$EXE" => Self::Executable,
#[cfg(not(target_os = "android"))]
"$FONT" => Self::Font,
#[cfg(not(target_os = "android"))]
"$HOME" => Self::Home,
#[cfg(not(target_os = "android"))]
"$RUNTIME" => Self::Runtime,
#[cfg(not(target_os = "android"))]
"$TEMPLATE" => Self::Template,
_ => return None,
};
Some(res)
}
}
impl<R: Runtime> PathResolver<R> {
/// Resolves the path with the base directory.
///
/// # Examples
///
/// ```rust,no_run
/// use tauri::{path::BaseDirectory, Manager};
/// tauri::Builder::default()
/// .setup(|app| {
/// let path = app.path().resolve("path/to/something", BaseDirectory::Config)?;
/// assert_eq!(path.to_str().unwrap(), "/home/${whoami}/.config/path/to/something");
/// Ok(())
/// });
/// ```
pub fn resolve<P: AsRef<Path>>(&self, path: P, base_directory: BaseDirectory) -> Result<PathBuf> {
resolve_path::<R>(self, base_directory, Some(path.as_ref().to_path_buf()))
}
/// Parse the given path, resolving a [`BaseDirectory`] variable if the path starts with one.
///
/// # Examples
///
/// ```rust,no_run
/// use tauri::Manager;
/// tauri::Builder::default()
/// .setup(|app| {
/// let path = app.path().parse("$HOME/.bashrc")?;
/// assert_eq!(path.to_str().unwrap(), "/home/${whoami}/.bashrc");
/// Ok(())
/// });
/// ```
pub fn parse<P: AsRef<Path>>(&self, path: P) -> Result<PathBuf> {
let mut p = PathBuf::new();
let mut components = path.as_ref().components();
match components.next() {
Some(Component::Normal(str)) => {
if let Some(base_directory) = BaseDirectory::from_variable(&str.to_string_lossy()) {
p.push(resolve_path::<R>(self, base_directory, None)?);
} else {
p.push(str);
}
}
Some(component) => p.push(component),
None => (),
}
for component in components {
if let Component::ParentDir = component {
continue;
}
p.push(component);
}
Ok(p)
}
}
fn resolve_path<R: Runtime>(
resolver: &PathResolver<R>,
directory: BaseDirectory,
path: Option<PathBuf>,
) -> Result<PathBuf> {
let resolve_resource = matches!(directory, BaseDirectory::Resource);
let mut base_dir_path = match directory {
BaseDirectory::Audio => resolver.audio_dir(),
BaseDirectory::Cache => resolver.cache_dir(),
BaseDirectory::Config => resolver.config_dir(),
BaseDirectory::Data => resolver.data_dir(),
BaseDirectory::LocalData => resolver.local_data_dir(),
BaseDirectory::Document => resolver.document_dir(),
BaseDirectory::Download => resolver.download_dir(),
BaseDirectory::Picture => resolver.picture_dir(),
BaseDirectory::Public => resolver.public_dir(),
BaseDirectory::Video => resolver.video_dir(),
BaseDirectory::Resource => resolver.resource_dir(),
BaseDirectory::Temp => Ok(temp_dir()),
BaseDirectory::AppConfig => resolver.app_config_dir(),
BaseDirectory::AppData => resolver.app_data_dir(),
BaseDirectory::AppLocalData => resolver.app_local_data_dir(),
BaseDirectory::AppCache => resolver.app_cache_dir(),
BaseDirectory::AppLog => resolver.app_log_dir(),
#[cfg(not(target_os = "android"))]
BaseDirectory::Desktop => resolver.desktop_dir(),
#[cfg(not(target_os = "android"))]
BaseDirectory::Executable => resolver.executable_dir(),
#[cfg(not(target_os = "android"))]
BaseDirectory::Font => resolver.font_dir(),
#[cfg(not(target_os = "android"))]
BaseDirectory::Home => resolver.home_dir(),
#[cfg(not(target_os = "android"))]
BaseDirectory::Runtime => resolver.runtime_dir(),
#[cfg(not(target_os = "android"))]
BaseDirectory::Template => resolver.template_dir(),
}?;
if let Some(path) = path {
// use the same path resolution mechanism as the bundler's resource injection algorithm
if resolve_resource {
let mut resource_path = PathBuf::new();
for component in path.components() {
match component {
Component::Prefix(_) => {}
Component::RootDir => resource_path.push("_root_"),
Component::CurDir => {}
Component::ParentDir => resource_path.push("_up_"),
Component::Normal(p) => resource_path.push(p),
}
}
base_dir_path.push(resource_path);
} else {
base_dir_path.push(path);
}
}
Ok(base_dir_path)
}
/// Initializes the plugin.
pub(crate) fn init<R: Runtime>() -> TauriPlugin<R> {
#[allow(unused_mut)]
let mut builder = Builder::new("path");
#[cfg(any(path_all, test))]
{
builder = builder.invoke_handler(crate::generate_handler![
commands::resolve_directory,
commands::resolve,
commands::normalize,
commands::join,
commands::dirname,
commands::extname,
commands::basename,
commands::is_absolute
]);
}
builder
.setup(|app, _api| {
#[cfg(target_os = "android")]
{
let handle = _api.register_android_plugin("app.tauri", "PathPlugin")?;
app.manage(PathResolver(handle));
}
#[cfg(not(target_os = "android"))]
{
app.manage(PathResolver(app.clone()));
}
Ok(())
})
.build()
}
#[cfg(test)]
mod test {
use super::SafePathBuf;
use quickcheck::{Arbitrary, Gen};
use std::path::PathBuf;
impl Arbitrary for SafePathBuf {
fn arbitrary(g: &mut Gen) -> Self {
Self(PathBuf::arbitrary(g))
}
fn shrink(&self) -> Box<dyn Iterator<Item = Self>> {
Box::new(self.0.shrink().map(SafePathBuf))
}
}
}