feat(Spotify - Spoof Client): Fix issues like songs skipping by spoofing to iOS

extensions/spotify/build.gradle.kts

@@ -7,7 +7,6 @@ dependencies {
     compileOnly(project(":extensions:spotify:stub"))
     compileOnly(libs.annotation)
 
-    implementation(project(":extensions:spotify:utils"))
     implementation(libs.nanohttpd)
     implementation(libs.protobuf.javalite)
 }

extensions/spotify/src/main/java/app/revanced/extension/spotify/misc/fix/ClientTokenService.java

@@ -0,0 +1,115 @@
+package app.revanced.extension.spotify.misc.fix;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import app.revanced.extension.shared.Logger;
+import app.revanced.extension.spotify.misc.fix.clienttoken.data.v0.ClienttokenHttp.*;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.HttpURLConnection;
+import java.net.URL;
+
+import static app.revanced.extension.spotify.misc.fix.Constants.*;
+
+class ClientTokenService {
+    private static final String IOS_CLIENT_ID = "58bd3c95768941ea9eb4350aaa033eb3";
+    private static final String IOS_USER_AGENT;
+
+    static {
+        String clientVersion = getClientVersion();
+        int commitHashIndex = clientVersion.lastIndexOf(".");
+        String version = clientVersion.substring(
+                clientVersion.indexOf("-") + 1,
+                clientVersion.lastIndexOf(".", commitHashIndex - 1)
+        );
+
+        IOS_USER_AGENT = "Spotify/" + version + " iOS/" + getSystemVersion() + " (" + getHardwareMachine() + ")";
+    }
+
+    private static final ConnectivitySdkData.Builder IOS_CONNECTIVITY_SDK_DATA =
+            ConnectivitySdkData.newBuilder()
+                    .setPlatformSpecificData(PlatformSpecificData.newBuilder()
+                            .setIos(NativeIOSData.newBuilder()
+                                    .setHwMachine(getHardwareMachine())
+                                    .setSystemVersion(getSystemVersion())
+                            )
+                    );
+
+    private static final ClientDataRequest.Builder IOS_CLIENT_DATA_REQUEST =
+            ClientDataRequest.newBuilder()
+                    .setClientVersion(getClientVersion())
+                    .setClientId(IOS_CLIENT_ID);
+
+    private static final ClientTokenRequest.Builder IOS_CLIENT_TOKEN_REQUEST =
+            ClientTokenRequest.newBuilder()
+                    .setRequestType(ClientTokenRequestType.REQUEST_CLIENT_DATA_REQUEST);
+
+
+    @NonNull
+    static ClientTokenRequest newIOSClientTokenRequest(String deviceId) {
+        Logger.printInfo(() -> "Creating new iOS client token request with device ID: " + deviceId);
+
+        return IOS_CLIENT_TOKEN_REQUEST
+                .setClientData(IOS_CLIENT_DATA_REQUEST
+                        .setConnectivitySdkData(IOS_CONNECTIVITY_SDK_DATA
+                                .setDeviceId(deviceId)
+                        )
+                )
+                .build();
+    }
+
+    @Nullable
+    static ClientTokenResponse getClientTokenResponse(@NonNull ClientTokenRequest request) {
+        if (request.getRequestType() == ClientTokenRequestType.REQUEST_CLIENT_DATA_REQUEST) {
+            Logger.printInfo(() -> "Requesting iOS client token");
+            String deviceId = request.getClientData().getConnectivitySdkData().getDeviceId();
+            request = newIOSClientTokenRequest(deviceId);
+        }
+
+        ClientTokenResponse response;
+        try {
+            response = requestClientToken(request);
+        } catch (IOException ex) {
+            Logger.printException(() -> "Failed to handle request", ex);
+            return null;
+        }
+
+        return response;
+    }
+
+    @NonNull
+    private static ClientTokenResponse requestClientToken(@NonNull ClientTokenRequest request) throws IOException {
+        HttpURLConnection urlConnection = (HttpURLConnection) new URL(CLIENT_TOKEN_API_URL).openConnection();
+        urlConnection.setRequestMethod("POST");
+        urlConnection.setDoOutput(true);
+        urlConnection.setRequestProperty("Content-Type", "application/x-protobuf");
+        urlConnection.setRequestProperty("Accept", "application/x-protobuf");
+        urlConnection.setRequestProperty("User-Agent", IOS_USER_AGENT);
+
+        byte[] requestArray = request.toByteArray();
+        urlConnection.setFixedLengthStreamingMode(requestArray.length);
+        urlConnection.getOutputStream().write(requestArray);
+
+        try (InputStream inputStream = urlConnection.getInputStream()) {
+            return ClientTokenResponse.parseFrom(inputStream);
+        }
+    }
+
+    @Nullable
+    static ClientTokenResponse serveClientTokenRequest(@NonNull InputStream inputStream) {
+        ClientTokenRequest request;
+        try {
+            request = ClientTokenRequest.parseFrom(inputStream);
+        } catch (IOException ex) {
+            Logger.printException(() -> "Failed to parse request from input stream", ex);
+            return null;
+        }
+        Logger.printInfo(() -> "Request of type: " + request.getRequestType());
+
+        ClientTokenResponse response = getClientTokenResponse(request);
+        if (response != null) Logger.printInfo(() -> "Response of type: " + response.getResponseType());
+
+        return response;
+    }
+}

extensions/spotify/src/main/java/app/revanced/extension/spotify/misc/fix/Constants.java

@@ -0,0 +1,26 @@
+package app.revanced.extension.spotify.misc.fix;
+
+import androidx.annotation.NonNull;
+
+class Constants {
+    static final String CLIENT_TOKEN_API_PATH = "/v1/clienttoken";
+    static final String CLIENT_TOKEN_API_URL = "https://clienttoken.spotify.com" + CLIENT_TOKEN_API_PATH;
+
+    // Modified by a patch. Do not touch.
+    @NonNull
+    static String getClientVersion() {
+        return "";
+    }
+
+    // Modified by a patch. Do not touch.
+    @NonNull
+    static String getSystemVersion() {
+        return "";
+    }
+
+    // Modified by a patch. Do not touch.
+    @NonNull
+    static String getHardwareMachine() {
+        return "";
+    }
+}