qbzd: install the rustls process-level CryptoProvider

The rustls crypto provider was not installed for `qbzd`, which caused the
process to panic:

> thread 'tokio-rt-worker' (15737) panicked at [...]/rustls-0.23.37/src/crypto/mod.rs:249:14:
>
> Could not automatically determine the process-level CryptoProvider from
> Rustls crate features.
> Call CryptoProvider::install_default() before this point to select a
> provider manually, or make sure exactly one of the 'aws-lc-rs' and 'ring'
> features is enabled.
> See the documentation of the CryptoProvider type for more information.

The function `ensure_crypto_provider()` was defined in the `qbz-cast` crate
which is obviously not a dependency of `qbzd`.

This commit moves `ensure_crypto_provider()` to `qbz-app`, calls it from `qbzd`
and updates `qbz` accordingly.

crates/Cargo.lock

@@ -5943,6 +5943,7 @@ dependencies = [
  "rand 0.10.1",
  "reqwest",
  "rusqlite",
+ "rustls",
  "serde",
  "serde_json",
  "tokio",
@@ -5998,7 +5999,6 @@ dependencies = [
  "mdns-sd",
  "rupnp",
  "rust_cast",
- "rustls",
  "serde",
  "serde_json",
  "thiserror 2.0.18",

crates/qbz-app/Cargo.toml

@@ -24,3 +24,6 @@ chrono = { workspace = true }
 md-5 = { workspace = true }
 base64 = { workspace = true }
 rand = "0.10"
+
+# TLS provider selection
+rustls = { version = "0.23", features = ["aws_lc_rs"] }

crates/qbz-app/src/lib.rs

@@ -10,3 +10,20 @@ pub mod session_store;
 pub mod shell;
 pub mod settings;
 pub mod user_data;
+
+/// Install the rustls process-level `CryptoProvider` (aws-lc-rs) exactly once.
+///
+/// Idempotent (a second call is a no-op); harmless if some other component
+/// already installed a default (`install_default` then returns Err, ignored).
+pub fn ensure_crypto_provider() {
+    use std::sync::Once;
+    static INIT: Once = Once::new();
+    INIT.call_once(|| {
+        if rustls::crypto::aws_lc_rs::default_provider()
+            .install_default()
+            .is_err()
+        {
+            log::debug!("[app] rustls CryptoProvider already installed");
+        }
+    });
+}

crates/qbz-cast/Cargo.toml

@@ -8,12 +8,6 @@ description = "Casting support for QBZ - Chromecast, DLNA"
 # Chromecast
 rust_cast = "0.21"
 
-# TLS provider selection. rust_cast uses rustls; in the multi-crate binary both
-# the aws-lc-rs and ring providers end up enabled (reqwest pulls ring), so
-# rustls can't auto-pick one and panics on connect. We install aws-lc-rs
-# explicitly before connecting (see `ensure_crypto_provider`).
-rustls = { version = "0.23", features = ["aws_lc_rs"] }
-
 # mDNS discovery
 mdns-sd = "0.11"
 

crates/qbz-cast/src/chromecast/thread.rs

@@ -75,9 +75,6 @@ impl ChromecastHandle {
 
     /// Connect to a Chromecast device
     pub fn connect(&self, ip: String, port: u16) -> Result<(), CastError> {
-        // rust_cast opens a rustls TLS channel; make sure a CryptoProvider is
-        // installed first (the worker thread would otherwise panic).
-        crate::ensure_crypto_provider();
         let (reply_tx, reply_rx) = mpsc::channel();
         self.sender
             .send(CastCommand::Connect {

crates/qbz-cast/src/dlna/device.rs

@@ -60,9 +60,6 @@ pub struct DlnaConnection {
 impl DlnaConnection {
     /// Connect to a DLNA device and discover service URLs
     pub async fn connect(device: DiscoveredDlnaDevice) -> Result<Self, DlnaError> {
-        // Defensive: the device-description fetch may go over TLS in some
-        // setups; ensure a rustls CryptoProvider is installed (idempotent).
-        crate::ensure_crypto_provider();
         let device_url: Uri = device
             .url
             .parse()

crates/qbz-cast/src/lib.rs

@@ -38,25 +38,3 @@ pub use dlna::{
 /// Cast device type alias for backwards compatibility
 pub type CastDevice = CastDeviceConnection;
 
-/// Install the rustls process-level `CryptoProvider` (aws-lc-rs) exactly once.
-///
-/// `rust_cast` opens a TLS control channel to the Chromecast via rustls. In the
-/// full QBZ binary BOTH the `aws-lc-rs` and `ring` providers are enabled (reqwest
-/// pulls `ring`, rust_cast pulls `aws-lc-rs`), so rustls can't auto-select one
-/// and panics with "Could not automatically determine the process-level
-/// CryptoProvider". Installing one explicitly before any TLS use fixes it.
-///
-/// Idempotent (a second call is a no-op); harmless if some other component
-/// already installed a default (`install_default` then returns Err, ignored).
-pub fn ensure_crypto_provider() {
-    use std::sync::Once;
-    static INIT: Once = Once::new();
-    INIT.call_once(|| {
-        if rustls::crypto::aws_lc_rs::default_provider()
-            .install_default()
-            .is_err()
-        {
-            log::debug!("[cast] rustls CryptoProvider already installed");
-        }
-    });
-}

crates/qbz/src/main.rs

@@ -8120,17 +8120,8 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
     // Large/XL (and shrink RAM at Small). Set before any artwork job runs.
     crate::artwork::set_ui_scale_factor(ui_scale_factor);
 
-    // Install the rustls process-level CryptoProvider ONCE, before ANY TLS use.
-    // The full binary compiles BOTH rustls providers (aws-lc-rs via qbz-cast's
-    // rust_cast, ring via reqwest), so rustls cannot auto-select one and panics
-    // ("Could not automatically determine the process-level CryptoProvider") the
-    // first time a TLS connection opens. Previously this was only installed lazily
-    // on the cast paths, so QConnect's tokio-tungstenite WebSocket (it opens a
-    // rustls TLS channel on its own worker thread) panicked when the user joined a
-    // session WITHOUT ever casting. Installing here at startup covers every TLS
-    // consumer — QConnect, cast, reqwest — regardless of which connects first.
-    // Idempotent (the cast paths still call it; the second call is a no-op).
-    qbz_cast::ensure_crypto_provider();
+    // Install the rustls process-level `CryptoProvider`
+    qbz_app::ensure_crypto_provider();
 
     let tokio_rt = tokio::runtime::Runtime::new()?;
     let _enter = tokio_rt.enter();

crates/qbzd/src/main.rs

@@ -256,6 +256,9 @@ enum ConfigCmd { Path, Show { #[arg(long)] json: bool } }
 
 #[tokio::main]
 async fn main() {
+    // Install the rustls process-level `CryptoProvider`
+    qbz_app::ensure_crypto_provider();
+
     let cli = Cli::parse();
     let code = match cli.cmd {
         Cmd::Version { json } => {