Allow specifying IP address to listen on

config.toml.example

@@ -1,5 +1,5 @@
 padlock-secret = ""
-port = 80
+listen = "[::]:80"
 
 [database]
 connection-string = "sqlite://sqlite.db"

src/config.rs

@@ -1,13 +1,20 @@
+use std::net::{Ipv6Addr, SocketAddr, SocketAddrV6};
+
 use serde::Deserialize;
 
 use crate::secrets::PadlockGenerationSecret;
 
+fn default_listen_addr() -> SocketAddr {
+    SocketAddr::V6(SocketAddrV6::new(Ipv6Addr::UNSPECIFIED, 80, 0, 0))
+}
+
 #[derive(Debug, Clone, Deserialize)]
 #[serde(rename_all = "kebab-case")]
 pub struct Config {
     #[serde(with = "hex::serde")]
     pub padlock_secret: PadlockGenerationSecret,
-    pub port: u16,
+    #[serde(default = "default_listen_addr")]
+    pub listen: SocketAddr,
 
     pub database: DatabaseConfig,
     #[serde(default)]

src/main.rs

@@ -99,7 +99,7 @@ async fn main() -> Result<()> {
     ));
 
     tokio::spawn(server::run(
-        config.port,
+        config.listen,
         user_authenticator,
         padlock_generator,
         user_server_key_generator,

src/server.rs

@@ -1,4 +1,4 @@
-use std::{net::Ipv6Addr, sync::Arc};
+use std::{net::SocketAddr, sync::Arc};
 
 use axum::{
     extract::{Query, State},
@@ -7,6 +7,7 @@ use axum::{
     routing::{get, post},
     Form, Json, Router,
 };
+use color_eyre::eyre::Context;
 use secrecy::ExposeSecret;
 use serde::{Deserialize, Serialize};
 use tracing::{event, instrument, Level};
@@ -25,7 +26,7 @@ struct AppState {
 
 #[instrument]
 pub async fn run(
-    port: u16,
+    listen: SocketAddr,
     user_authenticator: Arc<UserAuthenticator>,
     server_padlock_generator: Arc<ServerPadlockGenerator>,
     user_server_key_generator: Arc<UserServerKeyGenerator>,
@@ -49,7 +50,9 @@ pub async fn run(
         )
         .with_state(app_state);
 
-    let listener = tokio::net::TcpListener::bind((Ipv6Addr::UNSPECIFIED, port)).await?;
+    let listener = tokio::net::TcpListener::bind(listen)
+        .await
+        .context(format!("Failed to listen on {listen}"))?;
     axum::serve(listener, app).await?;
 
     Ok(())