Wire appsettings.json Config into main: bind address and credential store population

src/config.rs

@@ -0,0 +1,40 @@
+use serde::Deserialize;
+use std::path::Path;
+
+#[derive(Debug, Deserialize, Clone)]
+pub struct CredentialEntry {
+    pub username: String,
+    pub password: String,
+}
+
+#[derive(Debug, Deserialize, Clone)]
+pub struct ServerOptions {
+    /// Listen address, e.g. "0.0.0.0:3478"
+    pub bind: String,
+    /// Optional TLS: cert/key paths (not used in MVP)
+    pub tls_cert: Option<String>,
+    pub tls_key: Option<String>,
+}
+
+#[derive(Debug, Deserialize, Clone)]
+pub struct Config {
+    /// Server options
+    pub server: ServerOptions,
+    /// Initial credentials to populate the credential store
+    #[serde(default)]
+    pub credentials: Vec<CredentialEntry>,
+}
+
+impl Config {
+    /// Load configuration from a JSON file path
+    pub fn from_file<P: AsRef<Path>>(p: P) -> anyhow::Result<Self> {
+        let s = std::fs::read_to_string(p)?;
+        let cfg: Config = serde_json::from_str(&s)?;
+        Ok(cfg)
+    }
+
+    /// Try to load `appsettings.json` from current working directory as a convenience
+    pub fn load_default() -> anyhow::Result<Self> {
+        Self::from_file("appsettings.json")
+    }
+}

src/lib.rs

@@ -5,6 +5,7 @@ pub mod auth;
 pub mod traits;
 pub mod models;
 pub mod alloc;
+pub mod config;
 
 pub use crate::auth::*;
 pub use crate::stun::*;

src/main.rs

@@ -9,6 +9,7 @@ use niom_turn::auth::InMemoryStore;
 use niom_turn::stun::{parse_message, build_401_response, find_message_integrity, validate_message_integrity, build_success_response, encode_xor_relayed_address};
 use niom_turn::traits::CredentialStore;
 use niom_turn::alloc::AllocationManager;
+use niom_turn::config::Config;
 
 #[tokio::main]
 async fn main() -> anyhow::Result<()> {
@@ -16,12 +17,33 @@ async fn main() -> anyhow::Result<()> {
 
     info!("niom-turn starting");
 
-    // config
+    // config: try to load appsettings.json, otherwise fall back to defaults
-    let bind_addr: SocketAddr = "0.0.0.0:3478".parse()?;
+    let cfg = match Config::load_default() {
+        Ok(c) => {
+            info!("loaded config from appsettings.json");
+            c
+        }
+        Err(e) => {
+            info!("no appsettings.json found or failed to load: {} — using defaults", e);
+            // defaults
+            Config {
+                server: niom_turn::config::ServerOptions {
+                    bind: "0.0.0.0:3478".to_string(),
+                    tls_cert: None,
+                    tls_key: None,
+                },
+                credentials: vec![niom_turn::config::CredentialEntry { username: "testuser".into(), password: "secretpassword".into() }],
+            }
+        }
+    };
 
-    // Initialize credential store (MVP demo user)
+    let bind_addr: SocketAddr = cfg.server.bind.parse()?;
+
+    // Initialize credential store and populate from config
     let creds = InMemoryStore::new();
-    creds.insert("testuser", "secretpassword");
+    for c in cfg.credentials.iter() {
+        creds.insert(&c.username, &c.password);
+    }
 
     // UDP listener for TURN/STUN
     let udp = UdpSocket::bind(bind_addr).await?;