2024 edition

Reviewed-on: #1

Cargo.toml

@@ -1,13 +1,13 @@
 [package]
 name = "kosyncrs"
-version = "1.0.1"
-edition = "2021"
+version = "2.1.0"
+edition = "2024"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-axum = "0.6.20"
-redis = { version = "0.23.3", features = ["tokio-comp"] }
+axum = "0.8.1"
 serde = { version = "1.0.188", features = ["derive"] }
 serde_json = "1.0.107"
+sqlx = { version = "0.8.3", features = ["runtime-tokio", "postgres"] }
 tokio = { version = "1.32.0", features = ["macros", "rt-multi-thread"] }

LICENSE

@@ -0,0 +1,674 @@
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+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU 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 General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.

README.md

@@ -1,5 +1,48 @@
-# KOreader Sync Server
-This is a KOreader sync server, implemented in Rust.
+# 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 adopt the example systemd file for your needs. You can also use nginx as a reverse proxy, so that the sync server listens on port 443.
+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* (for example with psql) and create the database tables:
+```sql
+CREATE TABLE users (
+  id BIGSERIAL PRIMARY KEY,
+  username TEXT UNIQUE NOT NULL,
+  password TEXT
+);
+
+CREATE TABLE progresses (
+  id BIGSERIAL PRIMARY KEY,
+  user_id BIGINT NOT NULL,
+  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)
+);
+```

python/redis2pg.py

@@ -0,0 +1,52 @@
+#!/usr/bin/env python3
+
+import psycopg2
+import re
+import redis
+
+con = redis.Redis()
+
+pgcon = psycopg2.connect("postgresql://kosync:mypassword@localhost/kosync")
+pgcur = pgcon.cursor()
+
+userkeys = con.keys('user:*:key')
+
+for key in userkeys:
+    key = key.decode('utf-8')
+    match = re.search('user:(.*):key', key)
+    username = match.group(1)
+    password = con.get(key).decode('utf-8')
+
+    documentkeys = con.keys('user:' + username + ':document:*')
+    if len(documentkeys) == 0:
+        print("Skipped:", username)
+        continue
+    
+    pgcur.execute("INSERT INTO users (username, password) VALUES (%s, %s) ON CONFLICT (username) DO UPDATE SET username = %s, password = %s",
+                  (username, password, username, password))
+
+    pgcur.execute("SELECT id FROM users WHERE username = %s", (username,))
+    res = pgcur.fetchone()
+    user_id = res[0]
+
+    for dockey in documentkeys:
+        dockey = dockey.decode('utf-8')
+
+        match = re.search("user:.*:(.*)", dockey)
+        document = match.group(1)
+
+        docvals = con.hgetall(dockey)
+
+        progress = docvals[b"progress"].decode()
+        percentage = docvals[b"percentage"].decode()
+        device = docvals[b"device"].decode()
+        device_id = docvals[b"device_id"].decode()
+        timestamp = docvals[b"timestamp"].decode()
+
+        pgcur.execute("INSERT INTO progresses (user_id, document, progress, percentage, device, device_id, timestamp) VALUES (%s, %s, %s, %s, %s, %s, %s) ON CONFLICT (user_id, document) DO UPDATE SET user_id = %s, document = %s, progress = %s, percentage = %s, device = %s, device_id = %s, timestamp = %s",
+                      (user_id, document, progress, percentage, device, device_id, timestamp, user_id, document, progress, percentage, device, device_id, timestamp))
+
+pgcon.commit()
+
+pgcur.close()
+pgcon.close()

src/main.rs

@@ -1,16 +1,36 @@
+/*
+kosyncrs - A reading progress sync server for KOReader
+Copyright (C) 2025  Martin Brodbeck <martin@brodbeck-online.de>
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU 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 General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
 use axum::{
-    extract::Path, http::HeaderMap, http::StatusCode, routing::get, routing::post, routing::put,
+    extract::{Path, State},
+    http::HeaderMap,
+    http::StatusCode,
+    routing::get,
+    routing::post,
+    routing::put,
     Json, Router,
 };
+use serde::{Deserialize, Serialize};
+use serde_json::{json, Value};
+use sqlx::{postgres::PgPoolOptions, PgExecutor, PgPool};
 
-use serde::Deserialize;
-
-use redis::Commands;
-use serde::Serialize;
-use serde_json::json;
-use serde_json::Value;
-
-use std::time::{SystemTime, UNIX_EPOCH};
+use std::env;
+use std::time::{Duration, SystemTime, UNIX_EPOCH};
 
 #[derive(Deserialize)]
 pub struct User {
@@ -34,44 +54,73 @@ pub struct GetProgress {
     percentage: f32,
     device: String,
     device_id: String,
-    timestamp: u64,
+    timestamp: i64,
 }
 
+const VERSION: &str = env!("CARGO_PKG_VERSION");
+
 #[tokio::main]
 async fn main() {
+    let pg_url: String = env::var("PG_URL")
+        .ok()
+        .and_then(|v| v.parse().ok())
+        .unwrap();
+    let listen_port: String = env::var("PORT").ok().and_then(|v| v.parse().ok()).unwrap();
+
+    let db_pool = PgPoolOptions::new()
+        .max_connections(64)
+        .acquire_timeout(Duration::from_secs(5))
+        .connect(&pg_url)
+        .await
+        .expect("Can't connect to database.");
+
     // build our application with a single route
     let app = Router::new()
         .route("/", get(root))
         .route("/users/create", post(create_user))
         .route("/users/auth", get(auth_user))
         .route("/syncs/progress", put(update_progress))
-        .route("/syncs/progress/:document", get(get_progress))
-        .route("/healthcheck", get(healthcheck));
+        .route("/syncs/progress/{document}", get(get_progress))
+        .route("/healthcheck", get(healthcheck))
+        .route("/version", get(version))
+        .with_state(db_pool);
 
-    // run it with hyper on localhost:3000
-    axum::Server::bind(&"127.0.0.1:3003".parse().unwrap())
-        .serve(app.into_make_service())
-        .await
-        .unwrap();
+    let mut bind_with = "127.0.0.1:".to_owned();
+    bind_with += &listen_port;
+    let listener = tokio::net::TcpListener::bind(bind_with).await.unwrap();
+    axum::serve(listener, app).await.unwrap();
 }
 
 async fn root() -> &'static str {
     "KOreader sync server"
 }
 
-async fn create_user(Json(payload): Json<User>) -> (StatusCode, Json<Value>) {
-    let client = redis::Client::open("redis://127.0.0.1/").unwrap();
-    let mut con = client.get_connection().unwrap();
+async fn version() -> &'static str {
+    VERSION
+}
 
-    let username = payload.username;
+async fn create_user(
+    State(db_pool): State<PgPool>,
+    Json(payload): Json<User>,
+) -> (StatusCode, Json<Value>) {
+    let username = payload.username.trim().to_owned();
     let password = payload.password;
 
-    let user_key = format!("user:{username}:key");
+    let row: (i64,) = sqlx::query_as("SELECT COUNT(id) FROM users WHERE username = $1")
+        .bind(&username)
+        .fetch_one(&db_pool)
+        .await
+        .unwrap();
 
-    let does_exist: bool = con.exists(&user_key).unwrap();
+    let does_exist: bool = if row.0 >= 1 { true } else { false };
 
     if does_exist == false {
-        let _: () = con.set(&user_key, password).unwrap();
+        sqlx::query("INSERT INTO users (username, password) VALUES ($1, $2)")
+            .bind(&username)
+            .bind(&password)
+            .execute(&db_pool)
+            .await
+            .unwrap();
     } else {
         return (
             StatusCode::PAYMENT_REQUIRED,
@@ -82,110 +131,156 @@ async fn create_user(Json(payload): Json<User>) -> (StatusCode, Json<Value>) {
     (StatusCode::CREATED, Json(json!({ "username" : username })))
 }
 
-fn authorize(username: &str, password: &str) -> bool {
-    let client = redis::Client::open("redis://127.0.0.1/").unwrap();
-    let mut con = client.get_connection().unwrap();
-
+async fn authorize(db: impl PgExecutor<'_>, username: &str, password: &str) -> bool {
     if username.is_empty() || password.is_empty() {
         return false;
     }
 
-    let user_key = format!("user:{username}:key");
+    let row: Option<(String,)> = sqlx::query_as("SELECT password FROM users WHERE username = $1")
+        .bind(&username)
+        .fetch_optional(db)
+        .await
+        .unwrap();
 
-    let redis_pw: String = con.get(&user_key).unwrap();
-
-    if password != redis_pw {
-        return false;
+    if let Some(val) = row {
+        return password == val.0;
     }
 
-    true
+    false
 }
 
-async fn auth_user(headers: HeaderMap) -> (StatusCode, Json<Value>) {
-    let username = headers["x-auth-user"].to_str().unwrap_or("");
+async fn auth_user(State(db_pool): State<PgPool>, headers: HeaderMap) -> (StatusCode, Json<Value>) {
+    let username = headers["x-auth-user"].to_str().unwrap_or("").trim();
     let password = headers["x-auth-key"].to_str().unwrap_or("");
 
-    if authorize(&username, &password) == false {
-        return (
-            StatusCode::UNAUTHORIZED,
-            Json(json!({"message" : "Unauthorized"})),
-        );
+    let mut tx = db_pool.begin().await.unwrap();
+
+    if authorize(&mut *tx, username, password).await == true {
+        return (StatusCode::OK, Json(json!({"authorized" : "OK"})));
     }
 
-    (StatusCode::OK, Json(json!({"authorized" : "OK"})))
+    tx.commit().await.unwrap();
+
+    (
+        StatusCode::UNAUTHORIZED,
+        Json(json!({"message" : "Unauthorized"})),
+    )
 }
 
-async fn update_progress(headers: HeaderMap, Json(payload): Json<UpdateProgress>) -> StatusCode {
-    let username = headers["x-auth-user"].to_str().unwrap_or("");
+async fn update_progress(
+    State(db_pool): State<PgPool>,
+    headers: HeaderMap,
+    Json(payload): Json<UpdateProgress>,
+) -> StatusCode {
+    let username = headers["x-auth-user"].to_str().unwrap_or("").trim();
     let password = headers["x-auth-key"].to_str().unwrap_or("");
 
-    if authorize(username, password) == false {
+    let mut tx = db_pool.begin().await.unwrap();
+
+    if authorize(&mut *tx, username, password).await == false {
         return StatusCode::UNAUTHORIZED;
     }
 
-    let client = redis::Client::open("redis://127.0.0.1/").unwrap();
-    let mut con = client.get_connection().unwrap();
+    tx.commit().await.unwrap();
 
     let timestamp = SystemTime::now()
         .duration_since(UNIX_EPOCH)
         .unwrap()
         .as_secs();
-    let document = payload.document;
 
-    let doc_key = format!("user:{username}:document:{document}");
-    let _: () = con
-        .hset_multiple(
-            &doc_key,
-            &[
-                ("percentage", &payload.percentage.to_string()),
-                ("progress", &payload.progress),
-                ("device", &payload.device),
-                ("device_id", &payload.device_id),
-                ("timestamp", &timestamp.to_string()),
-            ],
-        )
+    let user_row: (i64,) = sqlx::query_as("SELECT id FROM users WHERE username = $1")
+        .bind(&username)
+        .fetch_one(&db_pool)
+        .await
         .unwrap();
 
+    let user_id = user_row.0;
+
+    let mut tx = db_pool.begin().await.unwrap();
+
+    let doc_row = sqlx::query("SELECT 1 FROM progresses WHERE user_id = $1 AND document = $2")
+        .bind(user_id)
+        .bind(&payload.document)
+        .fetch_optional(&mut *tx)
+        .await
+        .unwrap();
+
+    if doc_row.is_none() {
+        sqlx::query("INSERT INTO progresses (user_id, document, progress, percentage, device, device_id, timestamp) VALUES ($1, $2, $3, $4, $5, $6, $7)")
+                .bind(user_id)
+                .bind(&payload.document)
+                .bind(&payload.progress)
+                .bind(&payload.percentage)
+                .bind(&payload.device)
+                .bind(&payload.device_id)
+                .bind(timestamp as i64)
+                .execute(&mut *tx)
+                .await
+                .unwrap();
+    } else {
+        sqlx::query("UPDATE progresses SET progress = $3, percentage = $4, device = $5, device_id = $6, timestamp = $7 WHERE user_id = $1 AND document = $2")
+                .bind(user_id)
+                .bind(&payload.document)
+                .bind(&payload.progress)
+                .bind(&payload.percentage)
+                .bind(&payload.device)
+                .bind(&payload.device_id)
+                .bind(timestamp as i64)
+                .execute(&mut *tx)
+                .await
+                .unwrap();
+    }
+
+    tx.commit().await.unwrap();
+
     StatusCode::OK
 }
 
 async fn get_progress(
+    State(db_pool): State<PgPool>,
     headers: HeaderMap,
     Path(document): Path<String>,
 ) -> (StatusCode, Json<Value>) {
-    let username = headers["x-auth-user"].to_str().unwrap_or("");
+    let username = headers["x-auth-user"].to_str().unwrap_or("").trim();
     let password = headers["x-auth-key"].to_str().unwrap_or("");
 
-    if authorize(username, password) == false {
+    let mut tx = db_pool.begin().await.unwrap();
+
+    if authorize(&mut *tx, username, password).await == false {
         return (StatusCode::UNAUTHORIZED, Json(json!("")));
     }
 
-    let client = redis::Client::open("redis://127.0.0.1/").unwrap();
-    let mut con = client.get_connection().unwrap();
+    tx.commit().await.unwrap();
 
-    let doc_key = format!("user:{username}:document:{document}");
+    let row: (i64,) = sqlx::query_as("SELECT id FROM users WHERE username = $1")
+        .bind(&username)
+        .fetch_one(&db_pool)
+        .await
+        .unwrap();
 
-    let values: Vec<String> = con
-        .hget(
-            doc_key,
-            &["percentage", "progress", "device", "device_id", "timestamp"],
-        )
-        .unwrap_or_default();
+    let user_id = row.0;
 
-    if values.is_empty() {
-        return (StatusCode::OK, Json(json!({})));
+    let row: Option<(f32, String, String, String, i64)> = sqlx::query_as("SELECT percentage, progress, device, device_id, timestamp FROM progresses WHERE user_id = $1 AND document = $2")
+        .bind(user_id)
+        .bind(&document)
+        .fetch_optional(&db_pool)
+        .await
+        .unwrap();
+
+    if let Some(val) = row {
+        let progress = GetProgress {
+            percentage: val.0,
+            progress: val.1,
+            device: val.2,
+            device_id: val.3,
+            timestamp: val.4,
+            document,
+        };
+
+        return (StatusCode::OK, Json(json!(progress)));
     }
 
-    let res = GetProgress {
-        percentage: values[0].parse().unwrap(),
-        progress: values[1].clone(),
-        device: values[2].clone(),
-        device_id: values[3].clone(),
-        timestamp: values[4].parse().unwrap(),
-        document,
-    };
-
-    (StatusCode::OK, Json(json!(res)))
+    (StatusCode::OK, Json(json!("")))
 }
 
 async fn healthcheck() -> (StatusCode, Json<Value>) {

systemd/kosyncrs.service

@@ -2,7 +2,7 @@
 Description=KOReader Sync Server
 After=syslog.target
 After=network.target
-After=redis.service
+After=postgresql.service
 
 [Service]
 RestartSec=2s
@@ -11,6 +11,7 @@ User=myuser
 Group=users
 WorkingDirectory=/home/myuser
 ExecStart=/usr/local/bin/kosyncrs
+Environment=PG_URL=postgresql://kosync:password@localhost/kosync PORT=3003
 Restart=always
 
 [Install]