SeanOMik/gluetun-qbit-port-updater
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[package]
name = "gluetun-qbit-port-updater"
version = "0.1.0"
edition = "2021"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
anyhow = "1.0.75"
figment = { version = "0.10.12", features = ["env"] }
notify = "6.1.1"
reqwest = { version = "0.11.22", features = ["blocking"] }
serde = { version = "1.0.193", features = ["serde_derive"] }

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FROM rust:alpine3.14 as builder
# update packages
RUN apk update
RUN apk add build-base pkgconfig
# Install rust toolchains
RUN rustup toolchain install stable
RUN rustup default stable
# Build dependencies only. Separate these for caches
RUN cargo install cargo-build-deps
# Copy application now
WORKDIR /app
COPY ./ /app
RUN cargo build-deps --release
# Build the release executable.
RUN cargo build --release
# Runner stage.
FROM alpine
# update packages
RUN apk update
RUN apk add zfs
ARG UNAME=port_updater
ARG UID=1000
ARG GID=1000
# Add user and copy the executable from the build stage.
RUN adduser --disabled-password --gecos "" $UNAME -s -G $GID -u $UID
COPY --from=builder --chown=$UID:$GID /app/target/release/gluetun-qbit-port-updater /app/gluetun-qbit-port-updater
USER $UNAME
WORKDIR /app
ENTRYPOINT [ "/app/gluetun-qbit-port-updater" ]

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# Gluetun Qbittorrent Port Updater
Automatically updates qBittorrent's listening port to the port forwarded by [Gluetun](https://github.com/qdm12/gluetun/).
## Configuration
Currently the only configuration method is through environmental variables:
| Name | Description | Example | Required |
|---|---|---|---|
| PORT_UPD_QBITTORRENT_LOGIN | The login information for the webui. | admin | false |
| PORT_UPD_QBITTORRENT_PASSWORD | The password for the webui. | adminadmin | false |
| PORT_UPD_QBITTORRENT_PORT | The port of the webui. | 8080 | true |
| PORT_UPD_QBITTORRENT_HOST | The host of the webui. | localhost | true |
| PORT_UPD_PORT_FILE | The path to the file that contains the port. | `/tmp/gluetun/forwarded_port` | true |

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use std::{path::Path, time::Duration, sync::Arc, collections::HashMap};
use figment::{Figment, providers::Env};
use notify::{RecursiveMode, Watcher, Event, EventKind, event::{ModifyKind, DataChange}};
use serde::Deserialize;
#[derive(Debug, PartialEq, Deserialize)]
struct Config {
qbittorrent_login: Option<String>,
qbittorrent_password: Option<String>,
qbittorrent_https: Option<bool>,
qbittorrent_port: u32,
qbittorrent_host: String,
port_file: String,
}
impl Config {
fn https_str(&self) -> String {
if self.qbittorrent_https.unwrap_or(false) {
"https".to_string()
} else {
"http".to_string()
}
}
fn qbit_full_url(&self) -> String {
format!("{}://{}:{}", self.https_str(), self.qbittorrent_host, self.qbittorrent_port)
}
}
fn main() -> anyhow::Result<()> {
let config: Arc<Config> = Arc::new(Figment::new()
.merge(Env::prefixed("PORT_UPD_"))
.extract()?);
let port_path = Path::new(&config.port_file);
while !port_path.exists() {
println!("Couldn't find {}", config.port_file);
println!("Trying again in 10 seconds");
std::thread::sleep(Duration::from_secs(10));
}
let config_clone = config.clone();
let mut watcher = notify::recommended_watcher(move |res: Result<Event, notify::Error>| {
match res {
Ok(e) => {
//println!("e: {:?}", e);
if e.kind == EventKind::Modify(ModifyKind::Data(DataChange::Content))
|| e.kind.is_create() || e.kind.is_access() {
update_port(config_clone.clone()).unwrap();
}
},
Err(e) => println!("watch error: {:?}", e),
}
})?;
// update the port once on start in the case that gluetun got connected before this started
update_port(config.clone()).unwrap();
loop {
watcher.watch(port_path, RecursiveMode::Recursive)?;
}
}
fn update_port(config: Arc<Config>) -> anyhow::Result<()> {
let qbit_url = config.qbit_full_url();
let client = reqwest::blocking::Client::new();
let mut cookie_header = "".to_string();
if let (Some(login), Some(pass)) = (config.qbittorrent_login.clone(),
config.qbittorrent_password.clone()) {
let login_url = format!("{}/api/v2/auth/login", qbit_url);
let mut form = HashMap::new();
form.insert("username", login);
form.insert("password", pass);
let res = client.get(login_url)
.form(&form)
.send()?;
let cookie = res.headers().get("Set-Cookie").expect("Login failed");
let cookie = cookie.to_str().unwrap();
let sid_start = cookie.find("SID=").unwrap();
let sid_end = cookie.find(";").unwrap();
let sid = &cookie[sid_start..sid_end];
let cookie = format!("SID={};", sid);
cookie_header = cookie;
}
let new_port = std::fs::read_to_string(&config.port_file)?;
let new_port = new_port.trim();
let mut form = HashMap::new();
let json = format!("{{\"listen_port\": \"{}\"}}", new_port);
form.insert("json", json);
let url = format!("{}/api/v2/app/setPreferences", qbit_url);
let _body = client.post(url)
.form(&form)
.header("Cookie", cookie_header)
.send()?
.error_for_status()?;
println!("Successfully updated qbittorrent to port {}", new_port);
Ok(())
}