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//! The Node host's state dir (javascript/src/server createNodeContext): <state>/store.db rows
//! (ns, id, value JSON, revision) and secret settings sealed with <state>/secret.key (AES-256-GCM,
//! additional data "<plugin>:settings:<name>"), byte compatible, so the JS and Rust CLIs share
//! one saved session, attest keys, did:keys and managed_records ledger.
use std::fs::{self, OpenOptions};
use std::io::{ErrorKind, Write};
use std::os::unix::fs::{DirBuilderExt, OpenOptionsExt};
use std::path::Path;
use std::sync::{Arc, Mutex};
use aes_gcm::aead::{Aead, KeyInit, Payload};
use aes_gcm::{Aes256Gcm, Nonce};
use base64::Engine;
use base64::engine::general_purpose::STANDARD;
use rand_core::{OsRng, RngCore};
use rusqlite::{Connection, OptionalExtension, params};
use serde_json::{Value, json};
use crate::BoxFut;
use crate::run::Ledger;
pub fn random_bytes<const N: usize>() -> [u8; N] {
let mut out = [0; N];
OsRng.fill_bytes(&mut out);
out
}
/// crypto.randomUUID().
pub fn uuid() -> String {
let mut b = random_bytes::<16>();
b[6] = (b[6] & 0x0f) | 0x40;
b[8] = (b[8] & 0x3f) | 0x80;
let h: String = b.iter().map(|x| format!("{x:02x}")).collect();
format!(
"{}-{}-{}-{}-{}",
&h[..8],
&h[8..12],
&h[12..16],
&h[16..20],
&h[20..]
)
}
/// Base64 as atob / Uint8Array.fromBase64 read it: either alphabet, padding optional.
pub fn unbase64(text: &str) -> Result<Vec<u8>, String> {
let clean: String = text
.chars()
.filter(|c| !c.is_whitespace() && *c != '=')
.map(|c| match c {
'-' => '+',
'_' => '/',
c => c,
})
.collect();
base64::engine::general_purpose::STANDARD_NO_PAD
.decode(clean)
.map_err(|e| format!("invalid base64: {e}"))
}
#[derive(Clone)]
pub struct Store {
db: Arc<Mutex<Connection>>,
key: [u8; 32],
pub id: String,
}
impl Store {
pub fn open(state_dir: &Path, id: &str) -> Result<Self, String> {
fs::DirBuilder::new()
.recursive(true)
.mode(0o700)
.create(state_dir)
.map_err(|e| format!("{}: {e}", state_dir.display()))?;
let db = Connection::open(state_dir.join("store.db")).map_err(|e| e.to_string())?;
db.busy_timeout(std::time::Duration::from_secs(5))
.map_err(|e| e.to_string())?;
db.execute("CREATE TABLE IF NOT EXISTS rows (ns TEXT NOT NULL, id TEXT NOT NULL, value TEXT NOT NULL, revision TEXT NOT NULL, PRIMARY KEY (ns, id))", []).map_err(|e| e.to_string())?;
let key = secret_key(&state_dir.join("secret.key"))?;
Ok(Self {
db: Arc::new(Mutex::new(db)),
key,
id: id.into(),
})
}
pub fn get(&self, ns: &str, id: &str) -> Result<Option<Value>, String> {
let db = self.db.lock().unwrap();
let found: Option<String> = db
.query_row(
"SELECT value FROM rows WHERE ns = ? AND id = ?",
params![ns, id],
|r| r.get(0),
)
.optional()
.map_err(|e| e.to_string())?;
found
.map(|v| serde_json::from_str(&v).map_err(|e| e.to_string()))
.transpose()
}
pub fn put(&self, ns: &str, id: &str, value: &Value) -> Result<(), String> {
let db = self.db.lock().unwrap();
db.execute(
"INSERT INTO rows (ns, id, value, revision) VALUES (?, ?, ?, ?) ON CONFLICT DO UPDATE SET value = excluded.value, revision = excluded.revision",
params![ns, id, value.to_string(), uuid()],
)
.map(drop)
.map_err(|e| e.to_string())
}
pub fn delete(&self, ns: &str, id: &str) -> Result<bool, String> {
let db = self.db.lock().unwrap();
db.execute("DELETE FROM rows WHERE ns = ? AND id = ?", params![ns, id])
.map(|n| n > 0)
.map_err(|e| e.to_string())
}
fn aad(&self, name: &str) -> String {
format!("{}:settings:{name}", self.id)
}
/// ctx.settings.get for a secret setting (plain values pass through, as settingsAccess does).
pub fn setting(&self, name: &str) -> Result<Option<Value>, String> {
let Some(value) = self.get(&format!("{}:settings", self.id), name)? else {
return Ok(None);
};
let Some(secret) = value.get("$secret") else {
return Ok(Some(value));
};
let field = |k: &str| {
secret
.get(k)
.and_then(Value::as_str)
.ok_or_else(|| format!("setting {name}: bad $secret"))
.and_then(unbase64)
};
let (iv, data) = (field("iv")?, field("data")?);
let cipher = Aes256Gcm::new_from_slice(&self.key).expect("32-byte key");
let iv: [u8; 12] = iv
.try_into()
.map_err(|_| format!("setting {name}: bad $secret iv"))?;
let plain = cipher
.decrypt(
&Nonce::from(iv),
Payload {
msg: &data,
aad: self.aad(name).as_bytes(),
},
)
.map_err(|_| format!("setting {name}: cannot open (another secret.key?)"))?;
serde_json::from_slice(&plain)
.map(Some)
.map_err(|e| e.to_string())
}
/// ctx.settings.set for a secret setting: sealed with secret.key.
pub fn set_setting(&self, name: &str, value: &Value) -> Result<(), String> {
let iv = random_bytes::<12>();
let cipher = Aes256Gcm::new_from_slice(&self.key).expect("32-byte key");
let data = cipher
.encrypt(
&Nonce::from(iv),
Payload {
msg: value.to_string().as_bytes(),
aad: self.aad(name).as_bytes(),
},
)
.map_err(|e| e.to_string())?;
self.put(
&format!("{}:settings", self.id),
name,
&json!({ "$secret": { "iv": STANDARD.encode(iv), "data": STANDARD.encode(data) } }),
)
}
/// Take the lease `name` now if nobody holds it (or its holder's lease ran out), held until the guard
/// drops: the lock rows every process sharing the state dir sees, as javascript/src/server
/// createNodeContext's ctx.lock and ctx.lease take them ("<id>:locks" / name -> { owner, until }, in
/// BEGIN IMMEDIATE). None while another task or process holds it; one that died loses it after `ttl`.
pub fn try_lock(&self, name: &str, ttl: std::time::Duration) -> Result<Option<Lease>, String> {
let ns = format!("{}:locks", self.id);
let mut db = self.db.lock().unwrap();
let tx = db
.transaction_with_behavior(rusqlite::TransactionBehavior::Immediate)
.map_err(|e| e.to_string())?;
let held: Option<String> = tx
.query_row("SELECT value FROM rows WHERE ns = ? AND id = ?", params![ns, name], |r| r.get(0))
.optional()
.map_err(|e| e.to_string())?;
let now = crate::now_ms();
let until = held.and_then(|v| serde_json::from_str::<Value>(&v).ok()?.get("until")?.as_f64());
if until.is_some_and(|until| until > now as f64) {
return Ok(None);
}
let revision = uuid();
tx.execute(
"INSERT INTO rows (ns, id, value, revision) VALUES (?, ?, ?, ?) ON CONFLICT DO UPDATE SET value = excluded.value, revision = excluded.revision",
params![ns, name, json!({ "owner": revision, "until": now + ttl.as_millis() as u64 }).to_string(), revision],
)
.map_err(|e| e.to_string())?;
tx.commit().map_err(|e| e.to_string())?;
Ok(Some(Lease { store: self.clone(), ns, name: name.into(), revision }))
}
/// Wait for the lease `name` (polling while another task or process holds it): a lock across every
/// process sharing the state dir, held until the guard drops.
pub async fn lock(&self, name: &str, ttl: std::time::Duration) -> Result<Lease, String> {
loop {
if let Some(lease) = self.try_lock(name, ttl)? {
return Ok(lease);
}
tokio::time::sleep(std::time::Duration::from_millis(25)).await;
}
}
/// The did:key sealed under `name` in the "didkeys" setting, made and saved on first use. The
/// read-modify-write runs under the "didkeys" lease, so runs and processes that first use different
/// modules at once keep every key (javascript/src/server/cli.mjs takes the same lease).
pub async fn didkey(&self, name: &str) -> Result<crate::crypto::DidKey, String> {
let _lease = self.lock("didkeys", std::time::Duration::from_secs(10)).await?;
let mut keys = self.setting("didkeys")?.unwrap_or_else(|| json!({}));
let key = crate::crypto::DidKey::new(keys.get(name))?;
if keys.get(name).is_none() {
keys[name] = key.jwk.clone();
self.set_setting("didkeys", &keys)?;
}
Ok(key)
}
/// ctx.storage.<name> as the run-module ledger.
pub fn ledger(&self, name: &str) -> Arc<dyn Ledger> {
Arc::new(Collection {
store: self.clone(),
ns: format!("{}:storage:{name}", self.id),
})
}
}
/// A held Store::lock or try_lock; dropping it gives the lease back.
pub struct Lease {
store: Store,
ns: String,
name: String,
revision: String,
}
impl Lease {
/// Extend it by ttl from now (a long holder renews before it runs out); false once it is no longer ours.
pub fn renew(&self, ttl: std::time::Duration) -> Result<bool, String> {
let value = json!({ "owner": self.revision, "until": crate::now_ms() + ttl.as_millis() as u64 }).to_string();
let db = self.store.db.lock().unwrap();
db.execute("UPDATE rows SET value = ? WHERE ns = ? AND id = ? AND revision = ?", params![value, self.ns, self.name, self.revision])
.map(|n| n > 0)
.map_err(|e| e.to_string())
}
}
impl Drop for Lease {
fn drop(&mut self) {
let db = self.store.db.lock().unwrap();
let _ = db.execute("DELETE FROM rows WHERE ns = ? AND id = ? AND revision = ?", params![self.ns, self.name, self.revision]);
}
}
// 32 bytes in <state>/secret.key (0600), created on first use.
fn secret_key(path: &Path) -> Result<[u8; 32], String> {
let raw = match fs::read(path) {
Ok(raw) => raw,
Err(e) if e.kind() == ErrorKind::NotFound => {
let fresh = random_bytes::<32>();
match OpenOptions::new()
.write(true)
.create_new(true)
.mode(0o600)
.open(path)
{
Ok(mut f) => f
.write_all(&fresh)
.map(|_| fresh.to_vec())
.map_err(|e| e.to_string())?,
Err(e) if e.kind() == ErrorKind::AlreadyExists => {
fs::read(path).map_err(|e| e.to_string())?
}
Err(e) => return Err(e.to_string()),
}
}
Err(e) => return Err(e.to_string()),
};
raw.try_into()
.map_err(|_| format!("{} must hold 32 bytes", path.display()))
}
struct Collection {
store: Store,
ns: String,
}
impl Ledger for Collection {
fn get(&self, uri: &str) -> BoxFut<'_, Result<Option<Value>, String>> {
let found = self
.store
.get(&self.ns, uri)
.map(|v| v.filter(|v| !v.is_null()));
Box::pin(async move { found })
}
fn put(&self, uri: String, value: Value) -> BoxFut<'_, Result<(), String>> {
let done = self.store.put(&self.ns, &uri, &value);
Box::pin(async move { done })
}
fn delete(&self, uri: String) -> BoxFut<'_, Result<(), String>> {
let done = self.store.delete(&self.ns, &uri).map(drop);
Box::pin(async move { done })
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn sealed_settings_round_trip_and_stay_sealed_on_disk() {
let dir = std::env::temp_dir().join(format!("atlibs-host-store-{}", uuid()));
let store = Store::open(&dir, "atlibs-server").unwrap();
store
.set_setting("session", &json!({ "accessJwt": "secret-token" }))
.unwrap();
assert_eq!(
store.setting("session").unwrap(),
Some(json!({ "accessJwt": "secret-token" }))
);
let raw = store
.get("atlibs-server:settings", "session")
.unwrap()
.unwrap();
assert!(raw["$secret"]["iv"].is_string() && !raw.to_string().contains("secret-token"));
let again = Store::open(&dir, "atlibs-server").unwrap();
assert_eq!(
again.setting("session").unwrap(),
Some(json!({ "accessJwt": "secret-token" }))
);
assert_eq!(fs::metadata(dir.join("secret.key")).unwrap().len(), 32);
fs::remove_dir_all(dir).unwrap();
}
}
