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117 lines
3.6 KiB
Rust
117 lines
3.6 KiB
Rust
// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
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use deno_core::op2;
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use deno_core::url::Url;
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use deno_core::OpState;
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use deno_fs::FileSystemRc;
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use node_resolver::NodeResolution;
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use std::borrow::Cow;
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use std::path::Path;
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use std::path::PathBuf;
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use crate::NodePermissions;
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use crate::NodeRequireResolverRc;
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use crate::NodeResolverRc;
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#[must_use = "the resolved return value to mitigate time-of-check to time-of-use issues"]
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fn ensure_read_permission<'a, P>(
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state: &mut OpState,
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file_path: &'a Path,
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) -> Result<Cow<'a, Path>, deno_core::error::AnyError>
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where
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P: NodePermissions + 'static,
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{
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let resolver = state.borrow::<NodeRequireResolverRc>().clone();
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let permissions = state.borrow_mut::<P>();
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resolver.ensure_read_permission(permissions, file_path)
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}
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#[derive(Debug, thiserror::Error)]
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pub enum WorkerThreadsFilenameError {
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#[error(transparent)]
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Permission(deno_core::error::AnyError),
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#[error("{0}")]
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UrlParse(#[from] url::ParseError),
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#[error("Relative path entries must start with '.' or '..'")]
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InvalidRelativeUrl,
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#[error("URL from Path-String")]
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UrlFromPathString,
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#[error("URL to Path-String")]
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UrlToPathString,
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#[error("URL to Path")]
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UrlToPath,
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#[error("File not found [{0:?}]")]
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FileNotFound(PathBuf),
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#[error("Neither ESM nor CJS")]
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NeitherEsmNorCjs,
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#[error("{0}")]
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UrlToNodeResolution(node_resolver::errors::UrlToNodeResolutionError),
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#[error(transparent)]
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Fs(#[from] deno_io::fs::FsError),
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}
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#[op2]
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#[string]
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pub fn op_worker_threads_filename<P>(
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state: &mut OpState,
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#[string] specifier: String,
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) -> Result<String, WorkerThreadsFilenameError>
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where
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P: NodePermissions + 'static,
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{
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if specifier.starts_with("data:") {
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return Ok(specifier);
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}
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let url: Url = if specifier.starts_with("file:") {
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Url::parse(&specifier)?
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} else {
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let path = PathBuf::from(&specifier);
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if path.is_relative() && !specifier.starts_with('.') {
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return Err(WorkerThreadsFilenameError::InvalidRelativeUrl);
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}
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let path = ensure_read_permission::<P>(state, &path)
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.map_err(WorkerThreadsFilenameError::Permission)?;
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let fs = state.borrow::<FileSystemRc>();
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let canonicalized_path =
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deno_path_util::strip_unc_prefix(fs.realpath_sync(&path)?);
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Url::from_file_path(canonicalized_path)
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.map_err(|_| WorkerThreadsFilenameError::UrlFromPathString)?
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};
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let url_path = url
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.to_file_path()
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.map_err(|_| WorkerThreadsFilenameError::UrlToPathString)?;
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let url_path = ensure_read_permission::<P>(state, &url_path)
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.map_err(WorkerThreadsFilenameError::Permission)?;
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let fs = state.borrow::<FileSystemRc>();
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if !fs.exists_sync(&url_path) {
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return Err(WorkerThreadsFilenameError::FileNotFound(
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url_path.to_path_buf(),
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));
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}
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let node_resolver = state.borrow::<NodeResolverRc>();
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match node_resolver
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.url_to_node_resolution(url)
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.map_err(WorkerThreadsFilenameError::UrlToNodeResolution)?
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{
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NodeResolution::Esm(u) => Ok(u.to_string()),
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NodeResolution::CommonJs(u) => wrap_cjs(u),
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NodeResolution::BuiltIn(_) => {
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Err(WorkerThreadsFilenameError::NeitherEsmNorCjs)
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}
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}
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}
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///
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/// Wrap a CJS file-URL and the required setup in a stringified `data:`-URL
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///
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fn wrap_cjs(url: Url) -> Result<String, WorkerThreadsFilenameError> {
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let path = url
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.to_file_path()
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.map_err(|_| WorkerThreadsFilenameError::UrlToPath)?;
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let filename = path.file_name().unwrap().to_string_lossy();
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Ok(format!(
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"data:text/javascript,import {{ createRequire }} from \"node:module\";\
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const require = createRequire(\"{}\"); require(\"./{}\");",
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url, filename,
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))
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}
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