KOreader Sync Server

This is a KOreader sync server, implemented in Rust. It uses the crates axum, sqlx, serde and serde_json.

Requirements

• Rust toolchain for compilation
• A running PostgreSQL server
• Nginx (or Apache) webserver as a reverse proxy, since kosyncrs only listens locally and uses HTTP.

Installation

Just compile it with cargo build --release. You can then copy the executable for example to /usr/local/bin/.

If you want to start the service automatically, you can adapt the example systemd file for your needs. Please pay particularly attention to the PG_URL environment variable.You have to adjust the database username and password.

You can also use nginx as a reverse proxy, so that the sync server listens on port 443. An example file is provided.

Database setup

First, create a new database user and set a password:

$ createuser -P kosync

Then, create a new database which is owned by the newly created user:

$ createdb -O kosync kosync

Connect to the database as user kosync (with psql) and create the database tables:

CREATE TABLE users (
  id BIGSERIAL PRIMARY KEY,
  username TEXT UNIQUE NOT NULL,
  password TEXT
);

CREATE TABLE progresses (
  id BIGSERIAL PRIMARY KEY,
  user_id BIGINT,
  document TEXT NOT NULL,
  progress TEXT NOT NULL,
  percentage REAL NOT NULL,
  device TEXT NOT NULL,
  device_id TEXT NOT NULL,
  timestamp BIGINT NOT NULL,
  FOREIGN KEY (user_id)
     REFERENCES users(id) ON DELETE CASCADE,
  UNIQUE (user_id, document)
);