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openidea/wit/fs.wit
Arnaud Ritti 04b1b863df feat(plugins): add persistent private filesystem directories (#2051)
Closes #1947

Adds API 1.3 `fs.plugin-dir`: a persistent owner-only directory per plugin (0700 directories / 0600 files on Unix, owner-only ACL on Windows), separate from the packaged code, storage and secrets. The plugin reads and writes under it without fs.* grants, can open files there in the editor and pass their paths to approved programs; editor saves keep the protection, restart keeps the content, uninstall removes it. Traversal and symlink escapes into other plugins' directories are rejected (real-Wasm regressions).

Co-authored-by: arnaud-ritti <[email protected]>
2026-11-08 06:53:36 +08:00

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package openidea:[email protected];
/// Files outside the open projects: the configuration of the program a
/// plugin integrates with, a tool installed elsewhere, a licence file.
///
/// A plugin's own WASI has no preopened directory. Every path outside its
/// own `plugin-dir` is checked against its `fs.read:<path>` (reading) or
/// `fs.write:<path>`
/// (writing; it doesn't imply reading) grants; without one covering the path a
/// call returns `denied` naming the capability the manifest has to declare. A
/// file inside a project is `workspace.project.read-file` / `write-file`.
/// `path` is absolute, or starts with `~/` for the user's home.
interface fs {
use types.{error};
use workspace.{file-kind, file-stat};
/// The plugin's persistent private directory, created owner-only (0700,
/// owner-only ACL on Windows), removed on uninstall. Reading and writing
/// under it needs no fs.* grant; files created there are owner-only.
plugin-dir: func() -> result<string, error>;
/// A text file, decoded as the editor decodes it (BOM and encoding
/// detection), at most 16 MiB. Unsaved editor contents win, as they do
/// for `project.read-file`.
read-file: func(path: string) -> result<string, error>;
/// The bytes of a file (images, class files, archives), at most 16 MiB.
read-bytes: func(path: string) -> result<list<u8>, error>;
/// Metadata of an existing path, as `project.stat` reports it; a missing
/// path is `not-found`.
stat: func(path: string) -> result<file-stat, error>;
/// An entry of a directory.
record dir-entry {
/// The entry's name, without its directory.
name: string,
kind: file-kind,
}
/// The entries directly under a directory, sorted by name, at most 4096
/// (like `find-files`); a file is `invalid`.
read-dir: func(path: string) -> result<list<dir-entry>, error>;
/// Replaces the text of a file, or creates it, at most 16 MiB: in one step
/// (a reader never sees half of it), keeping the file's encoding and BOM;
/// a new file is UTF-8. `invalid` when the text can't be written in that
/// encoding, the directory is missing, the path is a directory, or an
/// editor holds unsaved changes for the file (save them first).
write-file: func(path: string, text: string) -> result<_, error>;
/// Replaces the bytes of a file, or creates it, at most 16 MiB, in one
/// step; fails like `write-file`.
write-bytes: func(path: string, bytes: list<u8>) -> result<_, error>;
}