Rename feature_flags to experimental_client_feature_flags

Additionally, use a caret (^) instead of an exclamation mark (!) to disable features

src/api/core/mod.rs

@@ -54,7 +54,7 @@ use crate::{
     auth::Headers,
     db::DbConn,
     error::Error,
-    util::{get_reqwest_client, parse_feature_flags},
+    util::{get_reqwest_client, parse_experimental_client_feature_flags},
 };
 
 #[derive(Serialize, Deserialize, Debug)]
@@ -192,8 +192,8 @@ fn version() -> Json<&'static str> {
 #[get("/config")]
 fn config() -> Json<Value> {
     let domain = crate::CONFIG.domain();
-    let feature_states = parse_feature_flags(&crate::CONFIG.feature_flags());
+    let feature_states = parse_experimental_client_feature_flags(&crate::CONFIG.experimental_client_feature_flags());
-    let mut config = json!({
+    Json(json!({
         // Note: The clients use this version to handle backwards compatibility concerns
         // This means they expect a version that closely matches the Bitwarden server version
         // We should make sure that we keep this updated when we support the new server features
@@ -213,10 +213,9 @@ fn config() -> Json<Value> {
           "notifications": format!("{domain}/notifications"),
           "sso": "",
         },
+        "feature_states": feature_states,
         "object": "config",
-    });
+    }))
-    config["featureStates"] = serde_json::to_value(feature_states).unwrap();
-    Json(config)
 }
 
 pub fn catchers() -> Vec<Catcher> {

src/config.rs

@@ -9,7 +9,7 @@ use reqwest::Url;
 use crate::{
     db::DbConnType,
     error::Error,
-    util::{get_env, get_env_bool, parse_feature_flags},
+    util::{get_env, get_env_bool, parse_experimental_client_feature_flags},
 };
 
 static CONFIG_FILE: Lazy<String> = Lazy::new(|| {
@@ -548,9 +548,9 @@ make_config! {
         authenticator_disable_time_drift: bool, true, def, false;
 
         /// Customize the enabled feature flags on the clients |> This is a comma separated list of feature flags to en-/disable.
-        /// Features are enabled by default which can be overridden by prefixing the feature with a `!`.
+        /// Features are enabled by default which can be overridden by prefixing the feature with a `^`.
         /// Autofill v2 is disabled by default because it is causing issues https://github.com/dani-garcia/vaultwarden/discussions/4052
-        feature_flags: String, false, def, "!autofill-v2,fido2-vault-credentials".to_string();
+        experimental_client_feature_flags: String, false, def, "^autofill-v2,fido2-vault-credentials".to_string();
 
         /// Require new device emails |> When a user logs in an email is required to be sent.
         /// If sending the email fails the login attempt will fail.
@@ -756,16 +756,15 @@ fn validate_config(cfg: &ConfigItems) -> Result<(), Error> {
         )
     }
 
-    const SUPPORTED_FLAGS: &[&str] = &[
+    const KNOWN_FLAGS: &[&str] = &[
         "autofill-overlay",
         "autofill-v2",
         "browser-fileless-import",
-        "display-kdf-iteration-warning",
         "fido2-vault-credentials",
     ];
-    for flag in parse_feature_flags(&cfg.feature_flags).keys() {
+    for flag in parse_experimental_client_feature_flags(&cfg.experimental_client_feature_flags).keys() {
-        if !SUPPORTED_FLAGS.contains(&flag.as_str()) {
+        if !KNOWN_FLAGS.contains(&flag.as_str()) {
-            err!(format!("Feature flag {flag:?} is not supported."));
+            err!(format!("The experimental client feature flag {flag:?} is unrecognized. Please ensure the feature flag is spelled correctly, a caret (^) is used for disabling and that it is supported in this version."));
         }
     }
 

src/util.rs

@@ -749,14 +749,14 @@ pub fn convert_json_key_lcase_first(src_json: Value) -> Value {
     }
 }
 
-/// Parses the feature flags string into a HashMap.
+/// Parses the experimental client feature flags string into a HashMap.
-pub fn parse_feature_flags(feature_flags: &str) -> HashMap<String, bool> {
+pub fn parse_experimental_client_feature_flags(experimental_client_feature_flags: &str) -> HashMap<String, bool> {
-    let feature_flags_lowercase = feature_flags.to_lowercase();
+    let experimental_client_feature_flags_lowercase = experimental_client_feature_flags.to_lowercase();
-    let features = feature_flags_lowercase.split(',').map(|f| f.trim()).collect::<Vec<_>>();
+    let features = experimental_client_feature_flags_lowercase.split(',').map(|f| f.trim()).collect::<Vec<_>>();
     let mut feature_states: HashMap<String, bool> = HashMap::new();
 
     for feature in features {
-        let is_enabled = !feature.starts_with('!');
+        let is_enabled = !feature.starts_with('^');
         let flag = if is_enabled {
             feature
         } else {