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// Copyright (C) 2026 Doan Luu Duc Tai <doan@luuduct.ai>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
use anyhow::{Context, Result, ensure};
use rusqlite::{Connection, OptionalExtension, params};
use serde_json::{Value, json};
use std::path::Path;
pub(crate) struct Store {
connection: Connection,
}
impl Store {
pub(crate) fn open(path: &Path) -> Result<Self> {
let connection = Connection::open(path)?;
connection.execute_batch("PRAGMA foreign_keys=ON; PRAGMA journal_mode=DELETE; PRAGMA synchronous=FULL; PRAGMA secure_delete=ON; CREATE TABLE IF NOT EXISTS metadata (key TEXT PRIMARY KEY, value TEXT NOT NULL); CREATE TABLE IF NOT EXISTS conversations (id TEXT PRIMARY KEY, cert TEXT NOT NULL, profile TEXT); CREATE TABLE IF NOT EXISTS messages (seq INTEGER PRIMARY KEY AUTOINCREMENT, conversation TEXT NOT NULL REFERENCES conversations(id), id TEXT NOT NULL UNIQUE, sender TEXT NOT NULL, ciphertext TEXT NOT NULL);")?;
Ok(Self { connection })
}
pub(crate) fn owner(&self) -> Result<Option<String>> {
Ok(self
.connection
.query_row("SELECT value FROM metadata WHERE key='owner'", [], |row| {
row.get(0)
})
.optional()?)
}
pub(crate) fn install_owner(&self, cert: &str) -> Result<()> {
ensure!(self.owner()?.is_none(), "Already initialized");
self.connection
.execute("INSERT INTO metadata VALUES ('owner', ?1)", [cert])?;
Ok(())
}
pub(crate) fn register(&self, id: &str, cert: &str) -> Result<()> {
if self.connection.query_row(
"SELECT EXISTS(SELECT 1 FROM conversations WHERE id=?1)",
[id],
|row| row.get::<_, bool>(0),
)? {
return Ok(());
}
let count: i64 =
self.connection
.query_row("SELECT COUNT(*) FROM conversations", [], |row| row.get(0))?;
ensure!(count < 1000, "Conversation limit reached");
self.connection.execute(
"INSERT INTO conversations (id,cert) VALUES (?1,?2)",
params![id, cert],
)?;
Ok(())
}
pub(crate) fn conversation(&self, id: &str) -> Result<Value> {
let (cert, profile): (String, Option<String>) = self.connection.query_row(
"SELECT cert,profile FROM conversations WHERE id=?1",
[id],
|row| Ok((row.get(0)?, row.get(1)?)),
)?;
let (total, visitor): (i64, i64) = self.connection.query_row(
"SELECT COUNT(*),COALESCE(SUM(sender=?1),0) FROM messages WHERE conversation=?1",
[id],
|row| Ok((row.get(0)?, row.get(1)?)),
)?;
Ok(
json!({"id":id,"public":cert,"profile":profile,"total":total,"visitor_sent":visitor,"owner_sent":total.checked_sub(visitor).context("Counter invariant")?}),
)
}
pub(crate) fn inbox(&self) -> Result<Value> {
let mut statement = self
.connection
.prepare("SELECT id FROM conversations ORDER BY id")?;
let ids = statement
.query_map([], |row| row.get::<_, String>(0))?
.collect::<rusqlite::Result<Vec<_>>>()?;
let conversations = ids
.iter()
.map(|id| self.conversation(id))
.collect::<Result<Vec<_>>>()?;
Ok(json!({"conversations":conversations}))
}
pub(crate) fn profile(&self, id: &str, ciphertext: &str) -> Result<()> {
self.connection.execute(
"UPDATE conversations SET profile=?2 WHERE id=?1 AND profile IS NULL",
params![id, ciphertext],
)?;
Ok(())
}
pub(crate) fn messages(&self, id: &str, count: u64, before: u64) -> Result<Value> {
ensure!(
count <= 50 && before <= i64::MAX.unsigned_abs(),
"Invalid history window"
);
let mut statement = self.connection.prepare("SELECT seq,id,sender,ciphertext FROM messages WHERE conversation=?1 AND (?3=0 OR seq<?3) ORDER BY seq DESC LIMIT ?2")?;
let messages = statement.query_map(params![id,i64::try_from(count)?,i64::try_from(before)?], |row| Ok(json!({"seq":row.get::<_,i64>(0)?,"id":row.get::<_,String>(1)?,"sender":row.get::<_,String>(2)?,"ciphertext":row.get::<_,String>(3)?})))?.collect::<rusqlite::Result<Vec<_>>>()?;
Ok(json!({"conversation":self.conversation(id)?,"messages":messages}))
}
pub(crate) fn send(
&mut self,
conversation: &str,
id: &str,
sender: &str,
ciphertext: &str,
) -> Result<Value> {
let transaction = self.connection.transaction()?;
let existing: Option<(i64, String, String, String)> = transaction
.query_row(
"SELECT seq,conversation,sender,ciphertext FROM messages WHERE id=?1",
[id],
|row| Ok((row.get(0)?, row.get(1)?, row.get(2)?, row.get(3)?)),
)
.optional()?;
if let Some((seq, previous_conversation, previous_sender, previous_ciphertext)) = existing {
ensure!(
previous_conversation == conversation
&& previous_sender == sender
&& previous_ciphertext == ciphertext,
"Conflicting message identifier"
);
transaction.commit()?;
return Ok(json!({"seq":seq,"conversation":self.conversation(conversation)?}));
}
let count: i64 = transaction.query_row(
"SELECT COUNT(*) FROM messages WHERE conversation=?1",
[conversation],
|row| row.get(0),
)?;
let used: i64 = transaction.query_row(
"SELECT COALESCE(SUM(LENGTH(ciphertext)),0) FROM messages",
[],
|row| row.get(0),
)?;
ensure!(
count < 10_000 && used < 1_000_000_000,
"Storage quota reached"
);
transaction.execute(
"INSERT INTO messages (conversation,id,sender,ciphertext) VALUES (?1,?2,?3,?4)",
params![conversation, id, sender, ciphertext],
)?;
let sequence = transaction.last_insert_rowid();
transaction.commit()?;
Ok(json!({"seq":sequence,"conversation":self.conversation(conversation)?}))
}
pub(crate) fn snapshot(&self, destination: &Path) -> Result<()> {
ensure!(!destination.exists(), "Snapshot destination already exists");
self.connection
.backup("main", destination, None::<fn(rusqlite::backup::Progress)>)?;
Ok(())
}
}
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