Implement turn server settings

this fills out the infos in /_matrix/client/r0/voip/turnServer with
values specified in the server config

src/client_server/voip.rs

@@ -1,4 +1,4 @@
-use crate::ConduitResult;
+use crate::{database::DatabaseGuard, ConduitResult};
 use ruma::api::client::r0::voip::get_turn_server_info;
 use std::time::Duration;
 
@@ -9,13 +9,13 @@ use rocket::get;
 ///
 /// TODO: Returns information about the recommended turn server.
 #[cfg_attr(feature = "conduit_bin", get("/_matrix/client/r0/voip/turnServer"))]
-#[tracing::instrument]
+#[tracing::instrument(skip(db))]
-pub async fn turn_server_route() -> ConduitResult<get_turn_server_info::Response> {
+pub async fn turn_server_route(db: DatabaseGuard) -> ConduitResult<get_turn_server_info::Response> {
     Ok(get_turn_server_info::Response {
-        username: "".to_owned(),
+        username: db.globals.turn_username().clone(),
-        password: "".to_owned(),
+        password: db.globals.turn_password().clone(),
-        uris: Vec::new(),
+        uris: db.globals.turn_uris().to_vec(),
-        ttl: Duration::from_secs(60 * 60 * 24),
+        ttl: Duration::from_secs(db.globals.turn_ttl()),
     }
     .into())
 }

src/database.rs

@@ -74,6 +74,14 @@ pub struct Config {
     trusted_servers: Vec<Box<ServerName>>,
     #[serde(default = "default_log")]
     pub log: String,
+    #[serde(default)]
+    turn_username: String,
+    #[serde(default)]
+    turn_password: String,
+    #[serde(default = "Vec::new")]
+    turn_uris: Vec<String>,
+    #[serde(default = "default_turn_ttl")]
+    turn_ttl: u64,
 
     #[serde(flatten)]
     catchall: BTreeMap<String, IgnoredAny>,
@@ -131,6 +139,10 @@ fn default_log() -> String {
     "info,state_res=warn,rocket=off,_=off,sled=off".to_owned()
 }
 
+fn default_turn_ttl() -> u64 {
+    60 * 60 * 24
+}
+
 #[cfg(feature = "sled")]
 pub type Engine = abstraction::sled::Engine;
 

src/database/globals.rs

@@ -226,6 +226,22 @@ impl Globals {
         self.jwt_decoding_key.as_ref()
     }
 
+    pub fn turn_password(&self) -> &String {
+        &self.config.turn_password
+    }
+
+    pub fn turn_ttl(&self) -> u64 {
+        self.config.turn_ttl
+    }
+
+    pub fn turn_uris(&self) -> &[String] {
+        &self.config.turn_uris
+    }
+
+    pub fn turn_username(&self) -> &String {
+        &self.config.turn_username
+    }
+
     /// TODO: the key valid until timestamp is only honored in room version > 4
     /// Remove the outdated keys and insert the new ones.
     ///