mirror of
https://github.com/storytold/vectorcraft.git
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213 lines
9.3 KiB
Rust
213 lines
9.3 KiB
Rust
//! The process-wide set of installed plug-ins.
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//!
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//! Plug-ins are installed per process, not per document: live effects are drawn from every open
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//! document (and from scratch sessions such as previews), and they must find the same plug-ins.
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use std::collections::{BTreeMap, HashSet};
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use std::sync::atomic::{AtomicU64, Ordering};
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use std::sync::{Arc, Mutex, RwLock};
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#[cfg(not(target_arch = "wasm32"))]
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use crate::Error;
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use crate::permissions::Grant;
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use crate::storage::Storage;
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use crate::{Limits, Plugin, Result};
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static PLUGINS: RwLock<BTreeMap<String, Arc<Plugin>>> = RwLock::new(BTreeMap::new());
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static REVISION: AtomicU64 = AtomicU64::new(0);
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/// What the user approved, by plug-in id.
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static GRANTS: RwLock<BTreeMap<String, Grant>> = RwLock::new(BTreeMap::new());
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/// Where each plug-in keeps its settings and cache, by plug-in id.
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static STORAGE: RwLock<BTreeMap<String, Arc<dyn Storage>>> = RwLock::new(BTreeMap::new());
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/// Keeps the settings and cache of plug-in `id` in `storage` from now on (`None`: nowhere, so its
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/// storage calls fail as unavailable). A run of the plug-in reaches only its own id's storage.
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pub fn set_storage(id: &str, storage: Option<Arc<dyn Storage>>) {
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let mut all = STORAGE.write().unwrap_or_else(|e| e.into_inner());
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match storage {
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Some(s) => all.insert(id.to_string(), s),
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None => all.remove(id),
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};
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}
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/// Where plug-in `id` keeps its settings and cache, if anywhere.
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pub fn storage(id: &str) -> Option<Arc<dyn Storage>> {
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STORAGE.read().unwrap_or_else(|e| e.into_inner()).get(id).cloned()
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}
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/// Records what the user approved for a plug-in, replacing an earlier grant for its id.
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pub fn grant(g: Grant) {
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GRANTS.write().unwrap_or_else(|e| e.into_inner()).insert(g.id.clone(), g);
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}
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/// What the user approved for plug-in `id`.
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pub fn granted(id: &str) -> Option<Grant> {
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GRANTS.read().unwrap_or_else(|e| e.into_inner()).get(id).cloned()
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}
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/// Every grant, sorted by id.
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pub fn grants() -> Vec<Grant> {
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GRANTS.read().unwrap_or_else(|e| e.into_inner()).values().cloned().collect()
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}
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/// Forgets what the user approved for `id`; false if nothing was.
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pub fn revoke(id: &str) -> bool {
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GRANTS.write().unwrap_or_else(|e| e.into_inner()).remove(id).is_some()
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}
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/// May `plugin` be installed without asking the user: does it list no permissions, or did the user
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/// already grant its id every permission it lists? A module with other bytes but no new permission
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/// needs no new approval.
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pub fn approved(plugin: &Plugin) -> bool {
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let m = plugin.manifest();
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!m.asks_permissions() || granted(&m.id).is_some_and(|g| g.covers(&m.permissions()))
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}
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/// Installs `plugin`, replacing one with the same id.
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pub fn install(mut plugin: Plugin) -> Arc<Plugin> {
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plugin.set_serial(REVISION.fetch_add(1, Ordering::Relaxed) + 1);
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let p = Arc::new(plugin);
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PLUGINS.write().unwrap_or_else(|e| e.into_inner()).insert(p.id().to_string(), p.clone());
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p
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}
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/// Loads `bytes` with the default limits and installs the plug-in.
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pub fn install_bytes(bytes: &[u8]) -> Result<Arc<Plugin>> {
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Ok(install(Plugin::load(bytes, Limits::default())?))
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}
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pub fn get(id: &str) -> Option<Arc<Plugin>> {
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PLUGINS.read().unwrap_or_else(|e| e.into_inner()).get(id).cloned()
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}
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/// Installed plug-ins, sorted by id.
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pub fn list() -> Vec<Arc<Plugin>> {
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PLUGINS.read().unwrap_or_else(|e| e.into_inner()).values().cloned().collect()
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}
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/// Uninstalls `id`; false if it wasn't installed.
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pub fn remove(id: &str) -> bool {
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let gone = PLUGINS.write().unwrap_or_else(|e| e.into_inner()).remove(id).is_some();
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if gone {
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REVISION.fetch_add(1, Ordering::Relaxed);
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}
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gone
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}
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/// Changes whenever a plug-in is installed or removed (for caches such as menus).
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pub fn revision() -> u64 {
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REVISION.load(Ordering::Relaxed)
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}
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/// `s` as a `&'static str`, for catalogues that hold static strings (effect and menu labels). Each
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/// distinct string is stored once, so memory stays bounded by the plug-ins ever installed.
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pub fn intern(s: &str) -> &'static str {
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static SET: Mutex<Option<HashSet<&'static str>>> = Mutex::new(None);
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let mut set = SET.lock().unwrap_or_else(|e| e.into_inner());
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let set = set.get_or_insert_with(HashSet::new);
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if let Some(v) = set.get(s) {
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return v;
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}
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let v: &'static str = Box::leak(s.to_string().into_boxed_str());
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set.insert(v);
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v
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}
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/// Reads a `.wasm` file (refusing anything that isn't a regular file or exceeds the module limit)
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/// and loads it.
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#[cfg(not(target_arch = "wasm32"))]
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pub fn load_file(path: &std::path::Path, limits: Limits) -> Result<Plugin> {
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use std::io::Read;
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let meta = std::fs::metadata(path).map_err(|e| Error::Io(format!("{}: {e}", path.display())))?;
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if !meta.is_file() {
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return Err(Error::Io(format!("{} is not a file", path.display())));
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}
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if meta.len() > limits.max_module_bytes as u64 {
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return Err(Error::Module(format!("{} is {} bytes (limit {})", path.display(), meta.len(), limits.max_module_bytes)));
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}
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let f = std::fs::File::open(path).map_err(|e| Error::Io(format!("{}: {e}", path.display())))?;
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let mut bytes = Vec::new();
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f.take(limits.max_module_bytes as u64 + 1).read_to_end(&mut bytes).map_err(|e| Error::Io(format!("{}: {e}", path.display())))?;
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Ok(Plugin::load(&bytes, limits)?.with_source(path.display().to_string()))
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}
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/// What [`load_folder`] reports for a plug-in the user disabled.
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pub const DISABLED: &str = "disabled: turn it on again in Help › Safe Mode, for the next launch";
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/// What [`load_folder`] did.
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#[derive(Clone, Debug, Default, PartialEq, Eq)]
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pub struct FolderReport {
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/// Ids of the plug-ins installed.
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pub loaded: Vec<String>,
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/// `(file, error)` for each `.wasm` that failed to load.
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pub failed: Vec<(String, String)>,
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/// The disabled items saved for the next launch changed: a plug-in disabled by its id alone was
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/// found in a file, which is now disabled too ([`crate::safe_mode::disable_file_of`]). The app
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/// saves the list again.
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pub disabled_changed: bool,
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}
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/// Installs every `*.wasm` directly in `dir` (not recursive), in file-name order. A bad module is
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/// reported and skipped, the others still load; so is a heavy one ([`crate::Budget::Heavy`]),
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/// which installs only once the user agrees, and one that lists permissions the user has not
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/// granted its id ([`approved`]).
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#[cfg(not(target_arch = "wasm32"))]
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pub fn load_folder(dir: &std::path::Path) -> Result<FolderReport> {
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load_folder_where(dir, |_| Ok(()), approved)
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}
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/// [`load_folder`], loading only the files `allow` accepts, and of the plug-ins that list
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/// permissions only those `approve` accepts; the others are reported as failed with the reason. A plug-in the user disabled ([`crate::safe_mode::skipped`]) is reported and
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/// skipped, by its file before it loads or by its id after (its file is then disabled too, so the
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/// next load skips it before it runs); the launch marker names each file while it loads
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/// ([`crate::safe_mode::loading`]). In Safe Mode nothing loads ([`Error::SafeMode`]).
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#[cfg(not(target_arch = "wasm32"))]
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pub fn load_folder_where(
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dir: &std::path::Path,
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allow: impl Fn(&std::path::Path) -> std::result::Result<(), String>,
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approve: impl Fn(&Plugin) -> bool,
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) -> Result<FolderReport> {
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use crate::safe_mode::{self, Item};
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safe_mode::check()?;
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let rd = std::fs::read_dir(dir).map_err(|e| Error::Io(format!("{}: {e}", dir.display())))?;
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let mut files: Vec<std::path::PathBuf> =
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rd.filter_map(|e| e.ok().map(|e| e.path())).filter(|p| p.extension().is_some_and(|x| x.eq_ignore_ascii_case("wasm"))).collect();
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files.sort();
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files.truncate(1000);
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let mut report = FolderReport::default();
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for f in files {
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if let Err(why) = allow(&f) {
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report.failed.push((f.display().to_string(), why));
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continue;
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}
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let item = Item::file(f.display().to_string());
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if safe_mode::skipped(&item) {
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report.failed.push((f.display().to_string(), DISABLED.into()));
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continue;
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}
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let token = safe_mode::loading(&item);
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let loaded = load_file(&f, Limits::default());
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safe_mode::loaded(token);
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match loaded {
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Ok(p) if safe_mode::skipped(&Item::of(&p)) => {
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report.disabled_changed |= safe_mode::disable_file_of(&Item::of(&p));
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report.failed.push((f.display().to_string(), DISABLED.into()));
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}
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// A heavy plug-in installs once the user agrees, which loading a folder doesn't ask.
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Ok(p) if p.manifest().budget == crate::Budget::Heavy => {
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report.failed.push((f.display().to_string(), "asks for a heavy budget, which the user allows when installing it on its own".into()));
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}
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Ok(p) if p.manifest().asks_permissions() && !approve(&p) => {
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let asked = crate::permissions::names(&p.manifest().permissions()).join(", ");
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report.failed.push((
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f.display().to_string(),
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format!("needs approval: it asks for {asked}, which the user grants when installing it on its own"),
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));
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}
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Ok(p) => report.loaded.push(install(p).id().to_string()),
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Err(e) => report.failed.push((f.display().to_string(), e.to_string())),
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}
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}
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Ok(report)
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}
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