feat(runtime): Allow embedders to perform additional access checks on file open

cli/node.rs

@@ -112,7 +112,7 @@ impl CjsCodeAnalyzer for CliCjsCodeAnalyzer {
       Some(source) => source,
       None => self
         .fs
-        .read_text_file_sync(&specifier.to_file_path().unwrap())?,
+        .read_text_file_sync(&specifier.to_file_path().unwrap(), None)?,
     };
     let analysis = self.inner_cjs_analysis(specifier, &source)?;
     match analysis {

cli/resolver.rs

@@ -298,7 +298,7 @@ impl NpmModuleLoader {
     let file_path = specifier.to_file_path().unwrap();
     let code = self
       .fs
-      .read_text_file_sync(&file_path)
+      .read_text_file_sync(&file_path, None)
       .map_err(AnyError::from)
       .with_context(|| {
         if file_path.is_dir() {

cli/standalone/file_system.rs

@@ -5,6 +5,7 @@ use std::path::PathBuf;
 use std::rc::Rc;
 use std::sync::Arc;
 
+use deno_runtime::deno_fs::AccessCheckCb;
 use deno_runtime::deno_fs::FileSystem;
 use deno_runtime::deno_fs::FsDirEntry;
 use deno_runtime::deno_fs::FsFileType;
@@ -47,6 +48,7 @@ impl DenoCompileFileSystem {
         create_new: false,
         mode: None,
       },
+      None,
       &old_file_bytes,
     )
   }
@@ -75,22 +77,24 @@ impl FileSystem for DenoCompileFileSystem {
     &self,
     path: &Path,
     options: OpenOptions,
+    access_check: Option<AccessCheckCb>,
   ) -> FsResult<Rc<dyn File>> {
     if self.0.is_path_within(path) {
       Ok(self.0.open_file(path)?)
     } else {
-      RealFs.open_sync(path, options)
+      RealFs.open_sync(path, options, access_check)
     }
   }
-  async fn open_async(
-    &self,
+  async fn open_async<'a>(
+    &'a self,
     path: PathBuf,
     options: OpenOptions,
+    access_check: Option<AccessCheckCb<'a>>,
   ) -> FsResult<Rc<dyn File>> {
     if self.0.is_path_within(&path) {
       Ok(self.0.open_file(&path)?)
     } else {
-      RealFs.open_async(path, options).await
+      RealFs.open_async(path, options, access_check).await
     }
   }
 

cli/util/gitignore.rs

@@ -105,7 +105,7 @@ impl GitIgnoreTree {
     });
     let current = self
       .fs
-      .read_text_file_sync(&dir_path.join(".gitignore"))
+      .read_text_file_sync(&dir_path.join(".gitignore"), None)
       .ok()
       .and_then(|text| {
         let mut builder = ignore::gitignore::GitignoreBuilder::new(dir_path);

ext/fs/in_memory_fs.rs

@@ -19,6 +19,7 @@ use deno_io::fs::FsError;
 use deno_io::fs::FsResult;
 use deno_io::fs::FsStat;
 
+use crate::interface::AccessCheckCb;
 use crate::interface::FsDirEntry;
 use crate::interface::FsFileType;
 use crate::FileSystem;
@@ -48,6 +49,7 @@ impl InMemoryFs {
         .write_file_sync(
           &path,
           OpenOptions::write(true, false, false, None),
+          None,
           &text.into_bytes(),
         )
         .unwrap();
@@ -82,15 +84,17 @@ impl FileSystem for InMemoryFs {
     &self,
     _path: &Path,
     _options: OpenOptions,
+    _access_check: Option<AccessCheckCb>,
   ) -> FsResult<Rc<dyn File>> {
     Err(FsError::NotSupported)
   }
-  async fn open_async(
-    &self,
+  async fn open_async<'a>(
+    &'a self,
     path: PathBuf,
     options: OpenOptions,
+    access_check: Option<AccessCheckCb<'a>>,
   ) -> FsResult<Rc<dyn File>> {
-    self.open_sync(&path, options)
+    self.open_sync(&path, options, access_check)
   }
 
   fn mkdir_sync(
@@ -350,6 +354,7 @@ impl FileSystem for InMemoryFs {
     &self,
     path: &Path,
     options: OpenOptions,
+    _access_check: Option<AccessCheckCb>,
     data: &[u8],
   ) -> FsResult<()> {
     let path = normalize_path(path);
@@ -397,16 +402,21 @@ impl FileSystem for InMemoryFs {
     }
   }
 
-  async fn write_file_async(
-    &self,
+  async fn write_file_async<'a>(
+    &'a self,
     path: PathBuf,
     options: OpenOptions,
+    access_check: Option<AccessCheckCb<'a>>,
     data: Vec<u8>,
   ) -> FsResult<()> {
-    self.write_file_sync(&path, options, &data)
+    self.write_file_sync(&path, options, access_check, &data)
   }
 
-  fn read_file_sync(&self, path: &Path) -> FsResult<Vec<u8>> {
+  fn read_file_sync(
+    &self,
+    path: &Path,
+    _access_check: Option<AccessCheckCb>,
+  ) -> FsResult<Vec<u8>> {
     let entry = self.get_entry(path);
     match entry {
       Some(entry) => match &*entry {
@@ -419,7 +429,11 @@ impl FileSystem for InMemoryFs {
       None => Err(FsError::Io(Error::new(ErrorKind::NotFound, "Not found"))),
     }
   }
-  async fn read_file_async(&self, path: PathBuf) -> FsResult<Vec<u8>> {
-    self.read_file_sync(&path)
+  async fn read_file_async<'a>(
+    &'a self,
+    path: PathBuf,
+    access_check: Option<AccessCheckCb<'a>>,
+  ) -> FsResult<Vec<u8>> {
+    self.read_file_sync(&path, access_check)
   }
 }

ext/fs/interface.rs

@@ -80,6 +80,25 @@ pub struct FsDirEntry {
 #[allow(clippy::disallowed_types)]
 pub type FileSystemRc = crate::sync::MaybeArc<dyn FileSystem>;
 
+pub trait AccessCheckFn:
+  for<'a> FnMut(
+  bool,
+  &'a Path,
+  &'a OpenOptions,
+) -> FsResult<std::borrow::Cow<'a, Path>>
+{
+}
+impl<T> AccessCheckFn for T where
+  T: for<'a> FnMut(
+    bool,
+    &'a Path,
+    &'a OpenOptions,
+  ) -> FsResult<std::borrow::Cow<'a, Path>>
+{
+}
+
+pub type AccessCheckCb<'a> = &'a mut (dyn AccessCheckFn + 'a);
+
 #[async_trait::async_trait(?Send)]
 pub trait FileSystem: std::fmt::Debug + MaybeSend + MaybeSync {
   fn cwd(&self) -> FsResult<PathBuf>;
@@ -91,11 +110,13 @@ pub trait FileSystem: std::fmt::Debug + MaybeSend + MaybeSync {
     &self,
     path: &Path,
     options: OpenOptions,
+    access_check: Option<AccessCheckCb>,
   ) -> FsResult<Rc<dyn File>>;
-  async fn open_async(
-    &self,
+  async fn open_async<'a>(
+    &'a self,
     path: PathBuf,
     options: OpenOptions,
+    access_check: Option<AccessCheckCb<'a>>,
   ) -> FsResult<Rc<dyn File>>;
 
   fn mkdir_sync(&self, path: &Path, recursive: bool, mode: u32)
@@ -202,38 +223,48 @@ pub trait FileSystem: std::fmt::Debug + MaybeSend + MaybeSync {
     &self,
     path: &Path,
     options: OpenOptions,
+    access_check: Option<AccessCheckCb>,
     data: &[u8],
   ) -> FsResult<()> {
-    let file = self.open_sync(path, options)?;
+    let file = self.open_sync(path, options, access_check)?;
     if let Some(mode) = options.mode {
       file.clone().chmod_sync(mode)?;
     }
     file.write_all_sync(data)?;
     Ok(())
   }
-  async fn write_file_async(
-    &self,
+  async fn write_file_async<'a>(
+    &'a self,
     path: PathBuf,
     options: OpenOptions,
+    access_check: Option<AccessCheckCb<'a>>,
     data: Vec<u8>,
   ) -> FsResult<()> {
-    let file = self.open_async(path, options).await?;
+    let file = self.open_async(path, options, access_check).await?;
     if let Some(mode) = options.mode {
       file.clone().chmod_async(mode).await?;
     }
     file.write_all(data.into()).await?;
     Ok(())
   }
 
-  fn read_file_sync(&self, path: &Path) -> FsResult<Vec<u8>> {
+  fn read_file_sync(
+    &self,
+    path: &Path,
+    access_check: Option<AccessCheckCb>,
+  ) -> FsResult<Vec<u8>> {
     let options = OpenOptions::read();
-    let file = self.open_sync(path, options)?;
+    let file = self.open_sync(path, options, access_check)?;
     let buf = file.read_all_sync()?;
     Ok(buf)
   }
-  async fn read_file_async(&self, path: PathBuf) -> FsResult<Vec<u8>> {
+  async fn read_file_async<'a>(
+    &'a self,
+    path: PathBuf,
+    access_check: Option<AccessCheckCb<'a>>,
+  ) -> FsResult<Vec<u8>> {
     let options = OpenOptions::read();
-    let file = self.open_async(path, options).await?;
+    let file = self.open_async(path, options, access_check).await?;
     let buf = file.read_all_async().await?;
     Ok(buf)
   }
@@ -253,14 +284,22 @@ pub trait FileSystem: std::fmt::Debug + MaybeSend + MaybeSync {
     self.stat_sync(path).is_ok()
   }
 
-  fn read_text_file_sync(&self, path: &Path) -> FsResult<String> {
-    let buf = self.read_file_sync(path)?;
+  fn read_text_file_sync(
+    &self,
+    path: &Path,
+    access_check: Option<AccessCheckCb>,
+  ) -> FsResult<String> {
+    let buf = self.read_file_sync(path, access_check)?;
     String::from_utf8(buf).map_err(|err| {
       std::io::Error::new(std::io::ErrorKind::InvalidData, err).into()
     })
   }
-  async fn read_text_file_async(&self, path: PathBuf) -> FsResult<String> {
-    let buf = self.read_file_async(path).await?;
+  async fn read_text_file_async<'a>(
+    &'a self,
+    path: PathBuf,
+    access_check: Option<AccessCheckCb<'a>>,
+  ) -> FsResult<String> {
+    let buf = self.read_file_async(path, access_check).await?;
     String::from_utf8(buf).map_err(|err| {
       std::io::Error::new(std::io::ErrorKind::InvalidData, err).into()
     })

ext/fs/lib.rs

@@ -7,6 +7,8 @@ mod std_fs;
 pub mod sync;
 
 pub use crate::in_memory_fs::InMemoryFs;
+pub use crate::interface::AccessCheckCb;
+pub use crate::interface::AccessCheckFn;
 pub use crate::interface::FileSystem;
 pub use crate::interface::FileSystemRc;
 pub use crate::interface::FsDirEntry;
@@ -20,9 +22,18 @@ use crate::ops::*;
 
 use deno_core::error::AnyError;
 use deno_core::OpState;
+use deno_io::fs::FsError;
 use std::path::Path;
 
-pub trait FsPermissions {
+pub trait FsPermissions: Send + Sync {
+  fn check_open<'a>(
+    &mut self,
+    resolved: bool,
+    read: bool,
+    write: bool,
+    path: &'a Path,
+    api_name: &str,
+  ) -> Result<std::borrow::Cow<'a, Path>, FsError>;
   fn check_read(&mut self, path: &Path, api_name: &str)
     -> Result<(), AnyError>;
   fn check_read_all(&mut self, api_name: &str) -> Result<(), AnyError>;
@@ -50,19 +61,20 @@ pub trait FsPermissions {
     api_name: &str,
   ) -> Result<(), AnyError>;
 
-  fn check(
+  fn check<'a>(
     &mut self,
+    resolved: bool,
     open_options: &OpenOptions,
-    path: &Path,
+    path: &'a Path,
     api_name: &str,
-  ) -> Result<(), AnyError> {
-    if open_options.read {
-      self.check_read(path, api_name)?;
-    }
-    if open_options.write || open_options.append {
-      self.check_write(path, api_name)?;
-    }
-    Ok(())
+  ) -> Result<std::borrow::Cow<'a, Path>, FsError> {
+    self.check_open(
+      resolved,
+      open_options.read,
+      open_options.write || open_options.append,
+      path,
+      api_name,
+    )
   }
 }