Re-introduce autoplay command-line option as an override

CHANGELOG.md

@@ -49,6 +49,10 @@ https://github.com/librespot-org/librespot
 - [core] Cache resolved access points during runtime (breaking)
 - [core] `FileId` is moved out of `SpotifyId`. For now it will be re-exported.
 - [core] Report actual platform data on login
+- [main] `autoplay {on|off}` now acts as an override. If unspecified, `librespot`
+  now follows the setting in the Connect client that controls it. (breaking)
+- [metadata] Most metadata is now retrieved with the `spclient` (breaking)
+- [metadata] Playlists are moved to the `playlist4_external` protobuf (breaking)
 - [playback] The audio decoder has been switched from `lewton` to `Symphonia`.
   This improves the Vorbis sound quality, adds support for MP3 as well as for
   FLAC in the future. (breaking)
@@ -56,8 +60,6 @@ https://github.com/librespot-org/librespot
 - [playback] The passthrough decoder is now feature-gated (breaking)
 - [playback] `rodio`: call play and pause
 - [protocol] protobufs have been updated
-- [metadata] Most metadata is now retrieved with the `spclient` (breaking)
-- [metadata] Playlists are moved to the `playlist4_external` protobuf (breaking)
 
 ### Added
 
@@ -100,13 +102,6 @@ https://github.com/librespot-org/librespot
 - [playback] Handle disappearing and invalid devices better
 - [playback] Handle seek, pause, and play commands while loading
 
-### Removed
-
-- [main] `autoplay` is no longer a command-line option. Instead, librespot now
-  follows the setting in the Connect client that controls it. Applications that
-  use librespot as a library without Connect should now instead use the
-  'autoplay' user attribute in the session.
-
 ## [0.4.2] - 2022-07-29
 
 Besides a couple of small fixes, this point release is mainly to blacklist the

connect/src/spirc.rs

@@ -772,6 +772,12 @@ impl SpircTask {
     fn handle_user_attributes_mutation(&mut self, mutation: UserAttributesMutation) {
         for attribute in mutation.get_fields().iter() {
             let key = attribute.get_name();
+
+            if key == "autoplay" && self.session.config().autoplay.is_some() {
+                trace!("Autoplay override active. Ignoring mutation.");
+                continue;
+            }
+
             if let Some(old_value) = self.session.user_data().attributes.get(key) {
                 let new_value = match old_value.as_ref() {
                     "0" => "1",

core/src/config.rs

@@ -13,6 +13,7 @@ pub struct SessionConfig {
     pub proxy: Option<Url>,
     pub ap_port: Option<u16>,
     pub tmp_dir: PathBuf,
+    pub autoplay: Option<bool>,
 }
 
 impl Default for SessionConfig {
@@ -31,6 +32,7 @@ impl Default for SessionConfig {
             proxy: None,
             ap_port: None,
             tmp_dir: std::env::temp_dir(),
+            autoplay: None,
         }
     }
 }

core/src/session.rs

@@ -438,6 +438,10 @@ impl Session {
     }
 
     pub fn autoplay(&self) -> bool {
+        if let Some(overide) = self.config().autoplay {
+            return overide;
+        }
+
         match self.get_user_attribute("autoplay") {
             Some(value) => matches!(&*value, "1"),
             None => false,

src/main.rs

@@ -197,6 +197,7 @@ fn get_setup() -> Setup {
     const VALID_NORMALISATION_RELEASE_RANGE: RangeInclusive<u64> = 1..=1000;
 
     const AP_PORT: &str = "ap-port";
+    const AUTOPLAY: &str = "autoplay";
     const BACKEND: &str = "backend";
     const BITRATE: &str = "bitrate";
     const CACHE: &str = "cache";
@@ -242,6 +243,7 @@ fn get_setup() -> Setup {
 
     // Mostly arbitrary.
     const AP_PORT_SHORT: &str = "a";
+    const AUTOPLAY_SHORT: &str = "A";
     const BACKEND_SHORT: &str = "B";
     const BITRATE_SHORT: &str = "b";
     const SYSTEM_CACHE_SHORT: &str = "C";
@@ -562,6 +564,12 @@ fn get_setup() -> Setup {
         AP_PORT,
         "Connect to an AP with a specified port 1 - 65535. Available ports are usually 80, 443 and 4070.",
         "PORT",
+    )
+    .optopt(
+        AUTOPLAY_SHORT,
+        AUTOPLAY,
+        "Explicitly set autoplay {on|off}. Defaults to following the client setting.",
+        "OVERRIDE",
     );
 
     #[cfg(feature = "passthrough-decoder")]
@@ -1140,6 +1148,26 @@ fn get_setup() -> Setup {
         0
     };
 
+    // #1046: not all connections are supplied an `autoplay` user attribute to run statelessly.
+    // This knob allows for a manual override.
+    let autoplay = match opt_str(AUTOPLAY) {
+        Some(value) => match value.as_ref() {
+            "on" => Some(true),
+            "off" => Some(false),
+            _ => {
+                invalid_error_msg(
+                    AUTOPLAY,
+                    AUTOPLAY_SHORT,
+                    &opt_str(AUTOPLAY).unwrap_or_default(),
+                    "on, off",
+                    "",
+                );
+                exit(1);
+            }
+        },
+        None => SessionConfig::default().autoplay,
+    };
+
     let connect_config = {
         let connect_default_config = ConnectConfig::default();
 
@@ -1293,7 +1321,8 @@ fn get_setup() -> Setup {
             }
         }),
 		tmp_dir,
-        ..SessionConfig::default()
+		autoplay,
+		..SessionConfig::default()
     };
 
     let player_config = {