commit 51e16359debcedcd751562bab1dcc72f189dda77
Author: Bluemangoo <chenfy2006@qq.com>
Date:   Sat Jun 20 23:03:06 2026 +0800

    Initial Commit

diff --git a/.gitignore b/.gitignore
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index 0000000..96ef862
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diff --git a/assets-updater/Cargo.toml b/assets-updater/Cargo.toml
new file mode 100644
index 0000000..15aa5f0
--- /dev/null
+++ b/assets-updater/Cargo.toml
@@ -0,0 +1,25 @@
+[package]
+name = "assets-updater"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+common = { path = "../common" }
+
+aes = { workspace = true }
+tokio = { workspace = true, features = ["process"] }
+rmp-serde = { workspace = true }
+hex = { workspace = true }
+cbc = { workspace = true }
+tempfile = { workspace = true }
+chrono = { workspace = true, features = ["serde"] }
+reqwest = { workspace = true }
+serde = { workspace = true, features = ["derive"] }
+regex = { workspace = true }
+yaml_serde = { workspace = true }
+image = { workspace = true }
+cridecoder = { workspace = true }
+thiserror = { workspace = true }
+log = { workspace = true }
+cipher = { workspace = true, features = ["block-padding"] }
+twox-hash = { workspace = true, features = ["xxhash3_128"] }
diff --git a/assets-updater/src/core/asset_execution.rs b/assets-updater/src/core/asset_execution.rs
new file mode 100644
index 0000000..6f02211
--- /dev/null
+++ b/assets-updater/src/core/asset_execution.rs
@@ -0,0 +1,384 @@
+use std::collections::HashMap;
+use std::path::PathBuf;
+use std::time::Duration;
+
+use crate::core::config::{AppConfig, RegionConfig, RegionProviderConfig};
+use crate::core::errors::AssetExecutionError;
+use crate::core::export_pipeline::extract_unity_asset_bundle;
+use crate::core::retry::retry_async;
+use aes::cipher::block_padding::Pkcs7;
+use aes::cipher::{BlockDecryptMut, KeyIvInit};
+use chrono::FixedOffset;
+use common::updater::{AssetCategory, SyncContext};
+use reqwest::header::{
+    ACCEPT, ACCEPT_ENCODING, ACCEPT_LANGUAGE, CONNECTION, COOKIE, HeaderMap, HeaderValue,
+    SET_COOKIE, USER_AGENT,
+};
+use serde::{Deserialize, Serialize};
+
+type Aes128CbcDec = cbc::Decryptor<aes::Aes128>;
+type Aes192CbcDec = cbc::Decryptor<aes::Aes192>;
+type Aes256CbcDec = cbc::Decryptor<aes::Aes256>;
+
+/// Deserializes a msgpack/JSON null or missing value as an empty String.
+/// Go silently coerces nil → zero value for non-pointer types; this helper
+/// mirrors that behavior for String fields.
+fn de_null_as_empty_string<'de, D>(deserializer: D) -> Result<String, D::Error>
+where
+    D: serde::Deserializer<'de>,
+{
+    Ok(Option::<String>::deserialize(deserializer)?.unwrap_or_default())
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct AssetBundleDetail {
+    #[serde(rename = "bundleName", deserialize_with = "de_null_as_empty_string")]
+    pub bundle_name: String,
+    #[serde(rename = "cacheFileName", deserialize_with = "de_null_as_empty_string")]
+    pub cache_file_name: String,
+    #[serde(
+        rename = "cacheDirectoryName",
+        deserialize_with = "de_null_as_empty_string"
+    )]
+    pub cache_directory_name: String,
+    // nuverse regions use `crc` instead of `hash`; the server may send nil here.
+    #[serde(rename = "hash", deserialize_with = "de_null_as_empty_string")]
+    pub hash: String,
+    #[serde(rename = "category")]
+    pub category: AssetCategory,
+    #[serde(rename = "crc")]
+    pub crc: i64,
+    #[serde(rename = "fileSize")]
+    pub file_size: i64,
+    #[serde(rename = "dependencies")]
+    pub dependencies: Vec<String>,
+    #[serde(rename = "paths", default)]
+    pub paths: Vec<String>,
+    #[serde(rename = "isBuiltin")]
+    pub is_builtin: bool,
+    #[serde(rename = "isRelocate")]
+    pub is_relocate: Option<bool>,
+    #[serde(rename = "md5Hash")]
+    pub md5_hash: Option<String>,
+    #[serde(rename = "downloadPath")]
+    pub download_path: Option<String>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct AssetBundleInfo {
+    #[serde(rename = "version")]
+    pub version: Option<String>,
+    #[serde(rename = "os")]
+    pub os: Option<String>,
+    #[serde(rename = "bundles")]
+    pub bundles: HashMap<String, AssetBundleDetail>,
+}
+
+#[derive(Debug, Clone)]
+pub struct AssetExecutionContext {
+    client: reqwest::Client,
+    region_name: String,
+    region: RegionConfig,
+    retry: crate::core::config::RetryConfig,
+    runtime_cookie: Option<String>,
+    resolved_asset_version: Option<String>,
+    pub sync_context: SyncContext,
+}
+
+impl AssetExecutionContext {
+    pub fn new(
+        app_config: &AppConfig,
+        sync_context: &SyncContext,
+        region: &RegionConfig,
+    ) -> Result<Self, AssetExecutionError> {
+        let mut headers = HeaderMap::new();
+        headers.insert(ACCEPT, HeaderValue::from_static("*/*"));
+        headers.insert(
+            USER_AGENT,
+            HeaderValue::from_static("ProductName/134 CFNetwork/1408.0.4 Darwin/22.5.0"),
+        );
+        headers.insert(CONNECTION, HeaderValue::from_static("keep-alive"));
+        headers.insert(
+            ACCEPT_ENCODING,
+            HeaderValue::from_static("gzip, deflate, br"),
+        );
+        headers.insert(
+            ACCEPT_LANGUAGE,
+            HeaderValue::from_static("zh-CN,zh-Hans;q=0.9"),
+        );
+        headers.insert(
+            "X-Unity-Version",
+            HeaderValue::from_str(&region.runtime.unity_version)
+                .map_err(|err| AssetExecutionError::HttpClient(err.to_string()))?,
+        );
+
+        let mut builder = reqwest::Client::builder()
+            .default_headers(headers)
+            .connect_timeout(Duration::from_secs(10))
+            .timeout(Duration::from_secs(180))
+            .pool_max_idle_per_host(100)
+            .tcp_keepalive(Duration::from_secs(30));
+
+        if let Some(proxy) = &app_config.execution.proxy
+            && !proxy.is_empty()
+        {
+            builder = builder.proxy(
+                reqwest::Proxy::all(proxy)
+                    .map_err(|err| AssetExecutionError::HttpClient(err.to_string()))?,
+            );
+        } else {
+            builder = builder.no_proxy();
+        }
+
+        Ok(Self {
+            client: builder
+                .build()
+                .map_err(|err| AssetExecutionError::HttpClient(err.to_string()))?,
+            sync_context: sync_context.clone(),
+            region_name: sync_context.region.clone(),
+            region: region.clone(),
+            retry: app_config.execution.retry.clone(),
+            runtime_cookie: None,
+            resolved_asset_version: sync_context.asset_version.clone(),
+        })
+    }
+
+    pub async fn download(
+        &self,
+        task: &str,
+        app_config: &AppConfig,
+    ) -> Result<(PathBuf, /*single file*/ bool), AssetExecutionError> {
+        let ctx = self.clone();
+        ctx.download_and_export_bundle(app_config, task).await
+    }
+
+    fn render_bundle_url(&self, task: &str) -> Result<String, AssetExecutionError> {
+        match &self.region.provider {
+            RegionProviderConfig::ColorfulPalette {
+                asset_bundle_url_template,
+                profile_hash,
+                ..
+            } => {
+                let asset_version =
+                    self.sync_context.asset_version.as_deref().ok_or_else(|| {
+                        AssetExecutionError::MissingAssetVersionOrHash {
+                            region: self.region_name.clone(),
+                        }
+                    })?;
+                let asset_hash = self.sync_context.asset_hash.as_deref().ok_or_else(|| {
+                    AssetExecutionError::MissingAssetVersionOrHash {
+                        region: self.region_name.clone(),
+                    }
+                })?;
+
+                Ok(asset_bundle_url_template
+                    .replace("{bundle_path}", task)
+                    .replace("{asset_version}", asset_version)
+                    .replace("{asset_hash}", asset_hash)
+                    .replace("{env}", "production")
+                    .replace("{hash}", profile_hash)
+                    + &time_arg_jst())
+            }
+            RegionProviderConfig::Nuverse {
+                asset_bundle_url_template,
+                ..
+            } => {
+                let app_version = self.sync_context.app_version.as_ref().ok_or_else(|| {
+                    AssetExecutionError::MissingAppVersion {
+                        region: self.region_name.clone(),
+                    }
+                })?;
+                let asset_version = self
+                    .resolved_asset_version
+                    .as_deref()
+                    .unwrap_or("<resolved-asset-version>");
+                Ok(asset_bundle_url_template
+                    .replace("{bundle_path}", task)
+                    .replace("{app_version}", app_version)
+                    .replace("{asset_version}", asset_version)
+                    + &time_arg_jst())
+            }
+        }
+    }
+
+    async fn get_with_retry(&self, url: &str) -> Result<Vec<u8>, AssetExecutionError> {
+        retry_async(
+            &self.retry,
+            "http get",
+            |_| async {
+                let mut request = self.client.get(url);
+                if let Some(cookie) = &self.runtime_cookie {
+                    request = request.header(COOKIE, cookie);
+                }
+                match request.send().await {
+                    Ok(response) if response.status().is_success() => {
+                        Ok(response.bytes().await?.to_vec())
+                    }
+                    Ok(response) => Err(AssetExecutionError::HttpStatus {
+                        url: url.to_string(),
+                        status: response.status().as_u16(),
+                    }),
+                    Err(err) => Err(AssetExecutionError::Http(err)),
+                }
+            },
+            is_retryable_http_error,
+        )
+        .await
+    }
+
+    pub async fn fetch_runtime_cookies(&mut self) -> Result<(), AssetExecutionError> {
+        let url = "https://issue.sekai.colorfulpalette.org/api/signature".to_string();
+        self.runtime_cookie = retry_async(
+            &self.retry,
+            "cookie bootstrap",
+            |_| async {
+                let response = self.client.post(&url).send().await?;
+                if response.status().is_success() {
+                    Ok(response
+                        .headers()
+                        .get(SET_COOKIE)
+                        .and_then(|value| value.to_str().ok())
+                        .map(str::to_string))
+                } else {
+                    Err(AssetExecutionError::HttpStatus {
+                        url: url.clone(),
+                        status: response.status().as_u16(),
+                    })
+                }
+            },
+            is_retryable_http_error,
+        )
+        .await?;
+        Ok(())
+    }
+
+    async fn download_and_export_bundle(
+        &self,
+        app_config: &AppConfig,
+        task: &str,
+    ) -> Result<(PathBuf, bool), AssetExecutionError> {
+        let bundle_url = self.render_bundle_url(task)?;
+        let body = self.get_with_retry(&bundle_url).await?;
+        let deobfuscated = deobfuscate(&body);
+
+        let temp_file = std::env::temp_dir()
+            .join("sekai-updater")
+            .join("obf")
+            .join(&self.region_name)
+            .join(task);
+        if let Some(parent) = temp_file.parent() {
+            std::fs::create_dir_all(parent).map_err(|source| {
+                AssetExecutionError::CreateTempDir {
+                    path: parent.to_path_buf(),
+                    source,
+                }
+            })?;
+        }
+        std::fs::write(&temp_file, deobfuscated).map_err(|source| {
+            AssetExecutionError::WriteTempFile {
+                path: temp_file.clone(),
+                source,
+            }
+        })?;
+        let export_result = extract_unity_asset_bundle(
+            app_config,
+            &self.sync_context,
+            &self.region,
+            &temp_file,
+            task,
+            task,
+        )
+        .await;
+        let _ = std::fs::remove_file(&temp_file);
+        export_result.map_err(Into::into)
+    }
+}
+
+fn is_retryable_http_error(err: &AssetExecutionError) -> bool {
+    match err {
+        AssetExecutionError::Http(_) => true,
+        AssetExecutionError::HttpStatus { status, .. } => *status >= 500,
+        _ => false,
+    }
+}
+
+pub fn decrypt_asset_bundle_info(
+    aes_key_hex: &str,
+    aes_iv_hex: &str,
+    content: &[u8],
+) -> Result<AssetBundleInfo, AssetExecutionError> {
+    if content.is_empty() {
+        return Err(AssetExecutionError::EmptyEncryptedContent);
+    }
+    if !content.len().is_multiple_of(16) {
+        return Err(AssetExecutionError::InvalidEncryptedBlockSize);
+    }
+
+    let key = hex::decode(aes_key_hex)
+        .map_err(|err| AssetExecutionError::InvalidAesKeyHex(err.to_string()))?;
+    let iv = hex::decode(aes_iv_hex)
+        .map_err(|err| AssetExecutionError::InvalidAesIvHex(err.to_string()))?;
+    if iv.len() != 16 {
+        return Err(AssetExecutionError::InvalidAesIvLength { got: iv.len() });
+    }
+
+    let mut buf = content.to_vec();
+    let decrypted = match key.len() {
+        16 => Aes128CbcDec::new_from_slices(&key, &iv)
+            .map_err(|err| AssetExecutionError::AssetInfoDecode(err.to_string()))?
+            .decrypt_padded_mut::<Pkcs7>(&mut buf)
+            .map_err(|err| AssetExecutionError::AssetInfoDecode(err.to_string()))?,
+        24 => Aes192CbcDec::new_from_slices(&key, &iv)
+            .map_err(|err| AssetExecutionError::AssetInfoDecode(err.to_string()))?
+            .decrypt_padded_mut::<Pkcs7>(&mut buf)
+            .map_err(|err| AssetExecutionError::AssetInfoDecode(err.to_string()))?,
+        32 => Aes256CbcDec::new_from_slices(&key, &iv)
+            .map_err(|err| AssetExecutionError::AssetInfoDecode(err.to_string()))?
+            .decrypt_padded_mut::<Pkcs7>(&mut buf)
+            .map_err(|err| AssetExecutionError::AssetInfoDecode(err.to_string()))?,
+        _ => {
+            return Err(AssetExecutionError::AssetInfoDecode(format!(
+                "unsupported AES key length {}",
+                key.len()
+            )));
+        }
+    };
+
+    rmp_serde::from_slice::<AssetBundleInfo>(decrypted)
+        .map_err(|err| AssetExecutionError::AssetInfoDecode(err.to_string()))
+}
+
+pub fn deobfuscate(data: &[u8]) -> Vec<u8> {
+    const SIMPLE: [u8; 4] = [0x20, 0x00, 0x00, 0x00];
+    const XOR_HEADER: [u8; 4] = [0x10, 0x00, 0x00, 0x00];
+
+    if data.starts_with(&SIMPLE) {
+        return data[4..].to_vec();
+    }
+
+    if data.starts_with(&XOR_HEADER) {
+        let body = &data[4..];
+        if body.len() < 128 {
+            return body.to_vec();
+        }
+
+        let mut header = vec![0u8; 128];
+        let pattern = [0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00];
+        for idx in 0..128 {
+            header[idx] = body[idx] ^ pattern[idx % pattern.len()];
+        }
+        let mut output = header;
+        output.extend_from_slice(&body[128..]);
+        return output;
+    }
+
+    data.to_vec()
+}
+
+fn time_arg_jst() -> String {
+    let tz = FixedOffset::east_opt(9 * 3600).unwrap();
+    format!(
+        "?t={}",
+        chrono::Utc::now().with_timezone(&tz).format("%Y%m%d%H%M%S")
+    )
+}
diff --git a/assets-updater/src/core/codec.rs b/assets-updater/src/core/codec.rs
new file mode 100644
index 0000000..6c4b1dd
--- /dev/null
+++ b/assets-updater/src/core/codec.rs
@@ -0,0 +1,89 @@
+use std::fs::File;
+use std::path::{Path, PathBuf};
+
+use cridecoder::{extract_acb_from_file, extract_usm_file, HcaDecoder};
+use serde::Serialize;
+
+use crate::core::errors::CodecError;
+
+pub const CODEC_BACKEND: &str = "crates.io:cridecoder@0.1.1";
+
+#[derive(Debug, Clone, Serialize)]
+pub struct CodecSummary {
+    pub backend: &'static str,
+    pub supports_acb: bool,
+    pub supports_usm: bool,
+    pub supports_hca_to_wav: bool,
+    pub supports_usm_metadata: bool,
+}
+
+pub fn codec_summary() -> CodecSummary {
+    CodecSummary {
+        backend: CODEC_BACKEND,
+        supports_acb: true,
+        supports_usm: true,
+        supports_hca_to_wav: true,
+        supports_usm_metadata: true,
+    }
+}
+
+pub fn export_acb(input: &Path, output_dir: &Path) -> Result<Option<Vec<String>>, CodecError> {
+    extract_acb_from_file(input, output_dir).map_err(|err| CodecError::Acb(err.to_string()))
+}
+
+pub fn export_usm(input: &Path, output_dir: &Path) -> Result<Vec<PathBuf>, CodecError> {
+    let outputs = extract_usm_file(input, output_dir, None, false)
+        .map_err(|err| CodecError::Usm(err.to_string()))?;
+    normalize_usm_output_names(input, outputs)
+}
+
+pub fn read_usm_metadata(input: &Path) -> Result<cridecoder::usm::Metadata, CodecError> {
+    cridecoder::usm::read_metadata_file(input).map_err(|err| CodecError::Metadata(err.to_string()))
+}
+
+pub fn decode_hca_to_wav(input: &Path, output: &Path) -> Result<(), CodecError> {
+    let input_path = input
+        .to_str()
+        .ok_or_else(|| CodecError::NonUtf8Path(input.to_path_buf()))?;
+
+    let mut decoder =
+        HcaDecoder::from_file(input_path).map_err(|err| CodecError::Hca(err.to_string()))?;
+    let mut file = File::create(output).map_err(|source| CodecError::Io {
+        path: output.to_path_buf(),
+        source,
+    })?;
+    decoder
+        .decode_to_wav(&mut file)
+        .map_err(|err| CodecError::Hca(err.to_string()))
+}
+
+fn normalize_usm_output_names(
+    input: &Path,
+    outputs: Vec<PathBuf>,
+) -> Result<Vec<PathBuf>, CodecError> {
+    let input_stem = input
+        .file_stem()
+        .and_then(|stem| stem.to_str())
+        .ok_or_else(|| CodecError::NonUtf8Path(input.to_path_buf()))?;
+
+    let mut normalized = Vec::with_capacity(outputs.len());
+    for output in outputs {
+        let ext = output
+            .extension()
+            .and_then(|ext| ext.to_str())
+            .ok_or_else(|| CodecError::NonUtf8Path(output.clone()))?;
+        let target = output.with_file_name(format!("{input_stem}.{ext}"));
+
+        if output != target {
+            std::fs::rename(&output, &target).map_err(|source| CodecError::Io {
+                path: target.clone(),
+                source,
+            })?;
+            normalized.push(target);
+        } else {
+            normalized.push(output);
+        }
+    }
+
+    Ok(normalized)
+}
diff --git a/assets-updater/src/core/config.rs b/assets-updater/src/core/config.rs
new file mode 100644
index 0000000..e5b9938
--- /dev/null
+++ b/assets-updater/src/core/config.rs
@@ -0,0 +1,167 @@
+use std::collections::BTreeMap;
+
+use serde::{Deserialize, Serialize};
+
+use crate::core::errors::ConfigError;
+
+#[derive(Debug, Clone, Default, Serialize, Deserialize)]
+#[serde(default)]
+pub struct AppConfig {
+    pub execution: ExecutionConfig,
+    pub tools: ToolsConfig,
+    pub concurrency: ConcurrencyConfig,
+    pub regions: BTreeMap<String, RegionConfig>,
+}
+
+impl AppConfig {
+    pub fn validate(&self) -> Result<(), ConfigError> {
+        for region_name in self.regions.keys() {
+            if region_name.to_lowercase() != *region_name {
+                return Err(ConfigError::InvalidRegionName(region_name.clone()));
+            }
+        }
+
+        Ok(())
+    }
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(default)]
+pub struct ToolsConfig {
+    pub ffmpeg_path: String,
+    pub asset_studio_cli_path: Option<String>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(default)]
+pub struct ExecutionConfig {
+    pub proxy: Option<String>,
+    pub timeout_seconds: u64,
+    pub allow_cancel: bool,
+    pub retry: RetryConfig,
+}
+
+impl Default for ExecutionConfig {
+    fn default() -> Self {
+        Self {
+            proxy: None,
+            timeout_seconds: 300,
+            allow_cancel: true,
+            retry: RetryConfig::default(),
+        }
+    }
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(default)]
+pub struct RetryConfig {
+    pub attempts: usize,
+    pub initial_backoff_ms: u64,
+    pub max_backoff_ms: u64,
+}
+
+impl Default for RetryConfig {
+    fn default() -> Self {
+        Self {
+            attempts: 4,
+            initial_backoff_ms: 1_000,
+            max_backoff_ms: 4_000,
+        }
+    }
+}
+
+impl Default for ToolsConfig {
+    fn default() -> Self {
+        Self {
+            ffmpeg_path: "ffmpeg".to_string(),
+            asset_studio_cli_path: None,
+        }
+    }
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(default)]
+pub struct ConcurrencyConfig {
+    pub download: usize,
+    pub upload: usize,
+    pub acb: usize,
+    pub usm: usize,
+    pub hca: usize,
+}
+
+impl Default for ConcurrencyConfig {
+    fn default() -> Self {
+        Self {
+            download: 4,
+            upload: 4,
+            acb: 8,
+            usm: 4,
+            hca: 16,
+        }
+    }
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize, Default)]
+#[serde(default)]
+pub struct RegionConfig {
+    pub provider: RegionProviderConfig,
+    pub crypto: CryptoConfig,
+    pub runtime: RegionRuntimeConfig,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(tag = "kind", rename_all = "snake_case")]
+pub enum RegionProviderConfig {
+    ColorfulPalette {
+        asset_info_url_template: String,
+        asset_bundle_url_template: String,
+        profile_hash: String,
+    },
+    Nuverse {
+        asset_version_url: String,
+        asset_info_url_template: String,
+        asset_bundle_url_template: String,
+        #[serde(default)]
+        required_cookies: bool,
+        #[serde(default)]
+        cookie_bootstrap_url: Option<String>,
+    },
+}
+
+impl Default for RegionProviderConfig {
+    fn default() -> Self {
+        Self::ColorfulPalette {
+            asset_info_url_template: String::new(),
+            asset_bundle_url_template: String::new(),
+            profile_hash: String::new(),
+        }
+    }
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize, Default)]
+#[serde(default)]
+pub struct CryptoConfig {
+    pub aes_key_hex: Option<String>,
+    pub aes_iv_hex: Option<String>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(default)]
+pub struct RegionRuntimeConfig {
+    pub unity_version: String,
+}
+
+impl Default for RegionRuntimeConfig {
+    fn default() -> Self {
+        Self {
+            unity_version: "2022.3.21f1".to_string(),
+        }
+    }
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize, Default)]
+#[serde(default)]
+pub struct RegionPathsConfig {
+    pub asset_save_dir: Option<String>,
+    pub downloaded_asset_record_file: Option<String>,
+}
diff --git a/assets-updater/src/core/errors.rs b/assets-updater/src/core/errors.rs
new file mode 100644
index 0000000..8294774
--- /dev/null
+++ b/assets-updater/src/core/errors.rs
@@ -0,0 +1,144 @@
+use std::path::PathBuf;
+
+use thiserror::Error;
+
+#[derive(Debug, Error)]
+pub enum ConfigError {
+    #[error("failed to read config file {path}: {source}")]
+    Read {
+        path: PathBuf,
+        #[source]
+        source: std::io::Error,
+    },
+    #[error("failed to parse config file {path}: {source}")]
+    Parse {
+        path: PathBuf,
+        #[source]
+        source: yaml_serde::Error,
+    },
+    #[error("config_version must be 2, got {0}")]
+    UnsupportedVersion(u32),
+    #[error("no v2 config file found; tried: {0}")]
+    MissingConfigFile(String),
+    #[error("invalid region key `{0}`; region keys must be lowercase")]
+    InvalidRegionName(String),
+    #[error("missing required environment variable `{name}` referenced by `{field}`")]
+    MissingEnvironmentVariable { field: String, name: String },
+}
+
+#[derive(Debug, Error)]
+pub enum RegionError {
+    #[error("region `{0}` not found")]
+    NotFound(String),
+    #[error("region `{0}` is disabled")]
+    Disabled(String),
+}
+
+
+#[derive(Debug, Error)]
+pub enum CodecError {
+    #[error("path {0} is not valid UTF-8 for cridecoder file APIs")]
+    NonUtf8Path(PathBuf),
+    #[error("io error at {path}: {source}")]
+    Io {
+        path: PathBuf,
+        #[source]
+        source: std::io::Error,
+    },
+    #[error("ACB extraction failed: {0}")]
+    Acb(String),
+    #[error("USM extraction failed: {0}")]
+    Usm(String),
+    #[error("USM metadata read failed: {0}")]
+    Metadata(String),
+    #[error("HCA decode failed: {0}")]
+    Hca(String),
+}
+
+#[derive(Debug, Error)]
+pub enum ExportPipelineError {
+    #[error(transparent)]
+    Codec(#[from] CodecError),
+    #[error("io error at {path}: {source}")]
+    Io {
+        path: PathBuf,
+        #[source]
+        source: std::io::Error,
+    },
+    #[error("image codec error at {path}: {source}")]
+    Image {
+        path: PathBuf,
+        #[source]
+        source: image::ImageError,
+    },
+    #[error("failed to spawn command `{program}`: {source}")]
+    Spawn {
+        program: String,
+        #[source]
+        source: std::io::Error,
+    },
+    #[error("command `{program}` failed with status {status}: {stderr}")]
+    CommandFailed {
+        program: String,
+        status: String,
+        stderr: String,
+    },
+    #[error("failed to spawn worker `{worker}`: {source}")]
+    WorkerSpawn {
+        worker: String,
+        #[source]
+        source: std::io::Error,
+    },
+    #[error("worker `{worker}` panicked: {message}")]
+    WorkerPanic { worker: String, message: String },
+}
+
+#[derive(Debug, Error)]
+pub enum AssetExecutionError {
+    #[error(transparent)]
+    Region(#[from] RegionError),
+    #[error(transparent)]
+    ExportPipeline(#[from] ExportPipelineError),
+    #[error("http request failed: {0}")]
+    Http(#[from] reqwest::Error),
+    #[error("failed to initialize HTTP client: {0}")]
+    HttpClient(String),
+    #[error("HTTP request to {url} returned status {status}")]
+    HttpStatus { url: String, status: u16 },
+    #[error("region `{region}` is missing asset_save_dir")]
+    MissingAssetSaveDir { region: String },
+    #[error("nuverse region `{region}` requires asset_version and asset_hash")]
+    MissingAppVersion { region: String },
+    #[error("colorful_palette region `{region}` requires asset_version and asset_hash")]
+    MissingAssetVersionOrHash { region: String },
+    #[error("colorful_palette region `{region}` is missing profile hash for `{profile}`")]
+    MissingProfileHash { region: String, profile: String },
+    #[error("region `{region}` is missing AES key or IV configuration")]
+    MissingCryptoConfig { region: String },
+    #[error("invalid AES key hex: {0}")]
+    InvalidAesKeyHex(String),
+    #[error("invalid AES IV hex: {0}")]
+    InvalidAesIvHex(String),
+    #[error("invalid AES IV length: got {got}, want 16")]
+    InvalidAesIvLength { got: usize },
+    #[error("encrypted content cannot be empty")]
+    EmptyEncryptedContent,
+    #[error("encrypted content length is not a multiple of AES block size")]
+    InvalidEncryptedBlockSize,
+    #[error("failed to decrypt or deserialize asset info: {0}")]
+    AssetInfoDecode(String),
+    #[error("failed to create temp directory for {path}: {source}")]
+    CreateTempDir {
+        path: PathBuf,
+        #[source]
+        source: std::io::Error,
+    },
+    #[error("failed to write temp file {path}: {source}")]
+    WriteTempFile {
+        path: PathBuf,
+        #[source]
+        source: std::io::Error,
+    },
+    #[error("job execution cancelled")]
+    Cancelled,
+}
diff --git a/assets-updater/src/core/export_pipeline.rs b/assets-updater/src/core/export_pipeline.rs
new file mode 100644
index 0000000..63b45cb
--- /dev/null
+++ b/assets-updater/src/core/export_pipeline.rs
@@ -0,0 +1,774 @@
+use std::collections::VecDeque;
+use std::path::{Path, PathBuf};
+use std::sync::{Arc, Mutex};
+
+use crate::core::codec;
+use crate::core::config::{AppConfig, RegionConfig};
+use crate::core::errors::ExportPipelineError;
+use crate::core::media::{
+    FrameRate, convert_m2v_to_mp4, convert_usm_to_mp4, convert_wav_to_flac, convert_wav_to_mp3,
+};
+use crate::core::retry::retry_async;
+use common::updater::SyncContext;
+use image::codecs::webp::WebPEncoder;
+use image::{ExtendedColorType, ImageReader};
+use log::debug;
+use serde::Serialize;
+use tokio::process::Command;
+
+#[derive(Debug, Clone, Copy)]
+struct AssetStudioCliCapabilities {
+    filter_exclude_mode: bool,
+    filter_blacklist_mode: bool,
+    sekai_keep_single_container_filename: bool,
+}
+
+#[derive(Debug, Clone, Serialize, Default)]
+pub struct PostProcessSummary {
+    pub export_root: PathBuf,
+    pub generated_files: Vec<PathBuf>,
+}
+
+pub fn get_export_group(export_path: &str) -> &'static str {
+    if export_path.is_empty() {
+        return "container";
+    }
+
+    let normalized = export_path
+        .replace('\\', "/")
+        .trim_start_matches('/')
+        .to_lowercase();
+
+    for prefix in [
+        "event/center",
+        "event/thumbnail",
+        "gacha/icon",
+        "fix_prefab/mc_new",
+        "mysekai/character/",
+    ] {
+        if normalized.starts_with(prefix) {
+            return "containerFull";
+        }
+    }
+
+    "container"
+}
+
+pub fn get_hex_index(input: &str) -> String {
+    let hash_val = twox_hash::XxHash3_128::oneshot(input.as_bytes());
+    format!("{:032x}", hash_val)
+}
+
+pub fn empty_dir(base: PathBuf, name: String) -> PathBuf {
+    let mut dir = base.join(&name);
+    let mut cnt = 1;
+    while dir.exists() {
+        dir = base.join(format!("{}_{}", &name, cnt));
+        cnt += 1;
+    }
+    std::fs::create_dir_all(&dir).unwrap();
+    dir
+}
+
+pub async fn extract_unity_asset_bundle(
+    app_config: &AppConfig,
+    sync_context: &SyncContext,
+    region: &RegionConfig,
+    asset_bundle_file: &Path,
+    export_path: &str,
+    download_path: &str,
+) -> Result<(PathBuf, bool), ExportPipelineError> {
+    let hash = get_hex_index(export_path);
+    let output_dir = empty_dir(
+        std::env::temp_dir()
+            .join("sekai-updater")
+            .join("extract")
+            .join(&sync_context.region),
+        hash,
+    );
+    let Some(asset_studio_cli_path) = app_config.tools.asset_studio_cli_path.as_deref() else {
+        return Ok((asset_bundle_file.parent().unwrap().to_path_buf(), true));
+    };
+
+    let exclude_path_prefix = "assets/sekai/assetbundle/resources/ondemand".to_string();
+    let actual_export_path = output_dir.join(export_path);
+
+    debug!("{}", actual_export_path.to_string_lossy());
+    let capabilities = detect_assetstudio_cli_capabilities(asset_studio_cli_path);
+    let args = build_assetstudio_export_args(
+        asset_bundle_file,
+        output_dir.as_path(),
+        export_path,
+        &exclude_path_prefix,
+        region,
+        sync_context,
+        capabilities,
+    );
+
+    retry_async(
+        &app_config.execution.retry,
+        "assetstudio export",
+        |_| async {
+            let output = Command::new(asset_studio_cli_path)
+                .args(&args)
+                .output()
+                .await
+                .map_err(|source| ExportPipelineError::Spawn {
+                    program: asset_studio_cli_path.to_string(),
+                    source,
+                })?;
+
+            if output.status.success() {
+                Ok(())
+            } else {
+                Err(ExportPipelineError::CommandFailed {
+                    program: asset_studio_cli_path.to_string(),
+                    status: output.status.to_string(),
+                    stderr: String::from_utf8_lossy(&output.stderr).trim().to_string(),
+                })
+            }
+        },
+        is_retryable_command_error,
+    )
+    .await?;
+
+    let mut count = 0;
+    let mut is_bundle_name_file = true;
+    let download_name = match download_path.rsplit_once("/") {
+        None => download_path,
+        Some((_, name)) => name,
+    };
+    walk(&output_dir, &mut |f| {
+        count += 1;
+        let file_name = f.file_name().unwrap().to_string_lossy();
+        is_bundle_name_file = is_bundle_name_file
+            && match file_name.rsplit_once(".") {
+                Some((name, _)) => name.eq_ignore_ascii_case(download_name),
+                None => file_name.eq_ignore_ascii_case(download_name),
+            }
+    })?;
+
+    post_process_exported_files(app_config, sync_context, region, &output_dir).await?;
+    Ok((output_dir, is_bundle_name_file && count <= 1))
+}
+
+pub async fn post_process_exported_files(
+    app_config: &AppConfig,
+    sync_context: &SyncContext,
+    region: &RegionConfig,
+    export_path: &Path,
+) -> Result<(), ExportPipelineError> {
+    if !export_path.exists() {
+        return Ok(());
+    }
+
+    handle_usm_files(
+        export_path,
+        sync_context,
+        &app_config.tools.ffmpeg_path,
+        &app_config.execution.retry,
+    )
+    .await?;
+    handle_acb_files(
+        export_path,
+        sync_context,
+        region,
+        &app_config.tools.ffmpeg_path,
+        &app_config.execution.retry,
+        app_config.concurrency.acb,
+        app_config.concurrency.hca,
+    )
+    .await?;
+    handle_png_conversion(export_path, sync_context, region).await?;
+
+    Ok(())
+}
+
+async fn handle_usm_files(
+    export_path: &Path,
+    sync_context: &SyncContext,
+    ffmpeg_path: &str,
+    retry: &crate::core::config::RetryConfig,
+) -> Result<Vec<PathBuf>, ExportPipelineError> {
+    let usm_files = find_files_by_extension(export_path, "usm")?;
+    if !sync_context.export.usm.export || !sync_context.export.usm.decode || usm_files.is_empty() {
+        return Ok(Vec::new());
+    }
+
+    let mut out: Vec<PathBuf> = vec![];
+
+    for f in usm_files {
+        out.append(&mut process_usm_file(&f, sync_context, ffmpeg_path, retry).await?);
+    }
+    Ok(out)
+}
+
+async fn process_usm_file(
+    usm_file: &Path,
+    sync_context: &SyncContext,
+    ffmpeg_path: &str,
+    retry: &crate::core::config::RetryConfig,
+) -> Result<Vec<PathBuf>, ExportPipelineError> {
+    let output_name = usm_file
+        .file_stem()
+        .and_then(|stem| stem.to_str())
+        .ok_or_else(|| ExportPipelineError::Io {
+            path: usm_file.to_path_buf(),
+            source: std::io::Error::new(std::io::ErrorKind::InvalidData, "invalid usm file name"),
+        })?
+        .to_string();
+
+    if sync_context.export.video.convert_to_mp4
+        && sync_context.export.video.direct_usm_to_mp4_with_ffmpeg
+    {
+        let mp4 = usm_file
+            .parent()
+            .unwrap()
+            .join(format!("{output_name}.mp4"));
+        convert_usm_to_mp4(usm_file, &mp4, ffmpeg_path, retry).await?;
+        remove_file_if_exists(usm_file)?;
+        return Ok(vec![mp4]);
+    }
+
+    let metadata = codec::read_usm_metadata(usm_file).ok();
+    let frame_rate = metadata
+        .as_ref()
+        .and_then(|metadata| metadata.video_frame_rate())
+        .filter(|(_, denominator)| *denominator > 0)
+        .map(FrameRate::from_tuple);
+    let extracted = codec::export_usm(usm_file, usm_file.parent().unwrap())?;
+    let mut generated = extracted.clone();
+
+    if sync_context.export.video.convert_to_mp4 {
+        for extracted_file in extracted {
+            if extracted_file
+                .extension()
+                .and_then(|ext| ext.to_str())
+                .map(|ext| ext.eq_ignore_ascii_case("m2v"))
+                .unwrap_or(false)
+            {
+                let mp4 = usm_file
+                    .parent()
+                    .unwrap()
+                    .join(format!("{output_name}.mp4"));
+                convert_m2v_to_mp4(
+                    &extracted_file,
+                    &mp4,
+                    sync_context.export.video.remove_m2v,
+                    ffmpeg_path,
+                    frame_rate,
+                    retry,
+                )
+                .await?;
+                generated.push(mp4);
+                if sync_context.export.video.remove_m2v {
+                    generated.retain(|path| path != &extracted_file);
+                }
+            }
+        }
+    }
+
+    remove_file_if_exists(usm_file)?;
+    Ok(generated)
+}
+
+async fn handle_acb_files(
+    export_path: &Path,
+    sync_context: &SyncContext,
+    region: &RegionConfig,
+    ffmpeg_path: &str,
+    retry: &crate::core::config::RetryConfig,
+    acb_concurrency: usize,
+    hca_concurrency: usize,
+) -> Result<Vec<PathBuf>, ExportPipelineError> {
+    let acb_files = find_files_by_extension(export_path, "acb")?;
+    if !sync_context.export.acb.export || !sync_context.export.acb.decode || acb_files.is_empty() {
+        return Ok(Vec::new());
+    }
+
+    let export_path = export_path.to_path_buf();
+    let region = region.clone();
+    let sync_context = sync_context.clone();
+    let ffmpeg_path = ffmpeg_path.to_string();
+    let retry = retry.clone();
+    run_path_tasks(acb_files, acb_concurrency, move |acb_file| {
+        process_acb_file(
+            &acb_file,
+            &export_path,
+            &sync_context,
+            &region,
+            &ffmpeg_path,
+            &retry,
+            hca_concurrency,
+        )
+    })
+}
+
+fn process_acb_file(
+    acb_file: &Path,
+    _output_dir: &Path,
+    sync_context: &SyncContext,
+    region: &RegionConfig,
+    ffmpeg_path: &str,
+    retry: &crate::core::config::RetryConfig,
+    hca_concurrency: usize,
+) -> Result<Vec<PathBuf>, ExportPipelineError> {
+    let parent_dir = acb_file.parent().ok_or_else(|| ExportPipelineError::Io {
+        path: acb_file.to_path_buf(),
+        source: std::io::Error::new(std::io::ErrorKind::NotFound, "missing parent directory"),
+    })?;
+    let extract_dir = tempfile::Builder::new()
+        .prefix("acb-extract-")
+        .tempdir_in(parent_dir)
+        .map_err(|source| ExportPipelineError::Io {
+            path: parent_dir.to_path_buf(),
+            source,
+        })?;
+
+    let _ = codec::export_acb(acb_file, extract_dir.path())?;
+    let mut hca_files = find_files_by_extension(extract_dir.path(), "hca")?;
+
+    let acb_path_lower = acb_file.to_string_lossy().replace('\\', "/").to_lowercase();
+    if acb_path_lower.contains("music/long") {
+        hca_files.retain(|path| {
+            let lower = path
+                .file_name()
+                .and_then(|name| name.to_str())
+                .unwrap_or_default()
+                .to_lowercase();
+            !(lower.ends_with("_vr.hca") || lower.ends_with("_screen.hca"))
+        });
+    }
+
+    if !sync_context.export.hca.decode {
+        remove_file_if_exists(acb_file)?;
+        return Ok(Vec::new());
+    }
+
+    let extract_output_dir = extract_dir.path().to_path_buf();
+    let region = region.clone();
+    let sync_context = sync_context.clone();
+    let ffmpeg_path = ffmpeg_path.to_string();
+    let retry = retry.clone();
+    let generated = run_path_tasks(hca_files, hca_concurrency, move |hca_file| {
+        process_hca_file(
+            &hca_file,
+            &extract_output_dir,
+            &sync_context,
+            &region,
+            &ffmpeg_path,
+            &retry,
+        )
+    })?;
+    let final_outputs = move_result_files(acb_file.parent().unwrap(), &generated)?;
+
+    remove_file_if_exists(acb_file)?;
+    Ok(final_outputs)
+}
+
+fn process_hca_file(
+    hca_file: &Path,
+    output_dir: &Path,
+    sync_context: &SyncContext,
+    _: &RegionConfig,
+    ffmpeg_path: &str,
+    retry: &crate::core::config::RetryConfig,
+) -> Result<Vec<PathBuf>, ExportPipelineError> {
+    let base_name = hca_file
+        .file_stem()
+        .and_then(|stem| stem.to_str())
+        .ok_or_else(|| ExportPipelineError::Io {
+            path: hca_file.to_path_buf(),
+            source: std::io::Error::new(std::io::ErrorKind::InvalidData, "invalid hca file name"),
+        })?;
+
+    let wav_file = hca_file.with_extension("wav");
+    codec::decode_hca_to_wav(hca_file, &wav_file)?;
+    remove_file_if_exists(hca_file)?;
+
+    let mut generated = vec![wav_file.clone()];
+    if sync_context.export.audio.convert_to_mp3 {
+        let mp3 = output_dir.join(format!("{base_name}.mp3"));
+        convert_wav_to_mp3(&wav_file, &mp3, ffmpeg_path, retry)?;
+        if sync_context.export.audio.remove_wav {
+            remove_file_if_exists(&wav_file)?;
+            generated.retain(|path| path != &wav_file);
+        }
+        generated.push(mp3);
+    } else if sync_context.export.audio.convert_to_flac {
+        let flac = output_dir.join(format!("{base_name}.flac"));
+        convert_wav_to_flac(&wav_file, &flac, ffmpeg_path, retry)?;
+        if sync_context.export.audio.remove_wav {
+            remove_file_if_exists(&wav_file)?;
+            generated.retain(|path| path != &wav_file);
+        }
+        generated.push(flac);
+    } else if sync_context.export.audio.remove_wav {
+        remove_file_if_exists(&wav_file)?;
+        generated.clear();
+    }
+
+    let final_outputs = move_result_files(hca_file.parent().unwrap(), &generated)?;
+    Ok(final_outputs)
+}
+
+async fn handle_png_conversion(
+    export_path: &Path,
+    sync_context: &SyncContext,
+    _: &RegionConfig,
+) -> Result<Vec<PathBuf>, ExportPipelineError> {
+    if !sync_context.export.images.convert_to_webp {
+        return Ok(Vec::new());
+    }
+
+    let png_files = find_files_by_extension(export_path, "png")?;
+    let mut generated = Vec::new();
+    for png_file in png_files {
+        let webp = png_file.with_extension("webp");
+        convert_png_to_webp(&png_file, &webp)?;
+        generated.push(webp.clone());
+        if sync_context.export.images.remove_png {
+            remove_file_if_exists(&png_file)?;
+        }
+    }
+    Ok(generated)
+}
+
+fn convert_png_to_webp(png_file: &Path, webp_file: &Path) -> Result<(), ExportPipelineError> {
+    let image = ImageReader::open(png_file)
+        .map_err(|source| ExportPipelineError::Io {
+            path: png_file.to_path_buf(),
+            source,
+        })?
+        .decode()
+        .map_err(|source| ExportPipelineError::Image {
+            path: png_file.to_path_buf(),
+            source,
+        })?;
+    let rgba = image.to_rgba8();
+    let (width, height) = rgba.dimensions();
+    let writer = std::fs::File::create(webp_file).map_err(|source| ExportPipelineError::Io {
+        path: webp_file.to_path_buf(),
+        source,
+    })?;
+    let writer = std::io::BufWriter::new(writer);
+
+    WebPEncoder::new_lossless(writer)
+        .encode(rgba.as_raw(), width, height, ExtendedColorType::Rgba8)
+        .map_err(|source| ExportPipelineError::Image {
+            path: webp_file.to_path_buf(),
+            source,
+        })
+}
+
+fn is_retryable_command_error(err: &ExportPipelineError) -> bool {
+    match err {
+        ExportPipelineError::Spawn { source, .. } => matches!(
+            source.kind(),
+            std::io::ErrorKind::Interrupted
+                | std::io::ErrorKind::TimedOut
+                | std::io::ErrorKind::WouldBlock
+                | std::io::ErrorKind::BrokenPipe
+                | std::io::ErrorKind::ConnectionReset
+                | std::io::ErrorKind::ConnectionAborted
+                | std::io::ErrorKind::ConnectionRefused
+        ),
+        ExportPipelineError::CommandFailed { .. } => true,
+        _ => false,
+    }
+}
+
+fn build_assetstudio_export_args(
+    asset_bundle_file: &Path,
+    output_dir: &Path,
+    export_path: &str,
+    exclude_path_prefix: &str,
+    region: &RegionConfig,
+    sync_context: &SyncContext,
+    capabilities: AssetStudioCliCapabilities,
+) -> Vec<String> {
+    let mut args = vec![
+        asset_bundle_file.to_string_lossy().to_string(),
+        "-m".to_string(),
+        "export".to_string(),
+        "-t".to_string(),
+        "monoBehaviour,textAsset,tex2d,tex2dArray,audio".to_string(),
+        "-g".to_string(),
+        get_export_group(export_path).to_string(),
+        "-f".to_string(),
+        "assetName".to_string(),
+        "-o".to_string(),
+        output_dir.to_string_lossy().to_string(),
+        "--strip-path-prefix".to_string(),
+        exclude_path_prefix.to_string(),
+        "-r".to_string(),
+    ];
+
+    if capabilities.filter_exclude_mode {
+        args.push("--filter-exclude-mode".to_string());
+    } else if capabilities.filter_blacklist_mode {
+        args.push("--filter-blacklist-mode".to_string());
+    }
+
+    args.push("--filter-with-regex".to_string());
+
+    if capabilities.sekai_keep_single_container_filename {
+        args.push("--sekai-keep-single-container-filename".to_string());
+    }
+
+    if !region.runtime.unity_version.is_empty() {
+        args.push("--unity-version".to_string());
+        args.push(region.runtime.unity_version.clone());
+    }
+
+    let mut excluded_exts = Vec::new();
+    if !sync_context.export.usm.export {
+        excluded_exts.push("usm");
+    }
+    if !sync_context.export.acb.export {
+        excluded_exts.push("acb");
+    }
+    if !excluded_exts.is_empty() {
+        args.push("--filter-by-name".to_string());
+        args.push(format!(r".*\.({})$", excluded_exts.join("|")));
+    }
+
+    args
+}
+
+fn detect_assetstudio_cli_capabilities(asset_studio_cli_path: &str) -> AssetStudioCliCapabilities {
+    static CACHE: std::sync::OnceLock<
+        Mutex<std::collections::HashMap<String, AssetStudioCliCapabilities>>,
+    > = std::sync::OnceLock::new();
+    let cache = CACHE.get_or_init(|| Mutex::new(std::collections::HashMap::new()));
+
+    if let Some(cached) = cache.lock().unwrap().get(asset_studio_cli_path).copied() {
+        return cached;
+    }
+
+    let fallback = AssetStudioCliCapabilities {
+        filter_exclude_mode: true,
+        filter_blacklist_mode: false,
+        sekai_keep_single_container_filename: true,
+    };
+
+    let detected = match std::process::Command::new(asset_studio_cli_path)
+        .arg("--help")
+        .output()
+    {
+        Ok(output) => {
+            let help = format!(
+                "{}\n{}",
+                String::from_utf8_lossy(&output.stdout),
+                String::from_utf8_lossy(&output.stderr)
+            );
+            AssetStudioCliCapabilities {
+                filter_exclude_mode: help.contains("--filter-exclude-mode"),
+                filter_blacklist_mode: help.contains("--filter-blacklist-mode"),
+                sekai_keep_single_container_filename: help
+                    .contains("--sekai-keep-single-container-filename"),
+            }
+        }
+        Err(_) => fallback,
+    };
+
+    cache
+        .lock()
+        .unwrap()
+        .insert(asset_studio_cli_path.to_string(), detected);
+    detected
+}
+
+fn move_result_files(
+    output_dir: &Path,
+    generated: &[PathBuf],
+) -> Result<Vec<PathBuf>, ExportPipelineError> {
+    let mut final_outputs = Vec::new();
+    for path in generated {
+        let file_name = match path.file_name() {
+            Some(name) => name,
+            None => continue,
+        };
+        let destination = output_dir.join(file_name);
+        if path != &destination {
+            std::fs::rename(path, &destination).map_err(|source| ExportPipelineError::Io {
+                path: destination.clone(),
+                source,
+            })?;
+            final_outputs.push(destination);
+        } else if destination.exists() {
+            final_outputs.push(destination);
+        }
+    }
+    Ok(final_outputs)
+}
+
+fn run_path_tasks<F>(
+    paths: Vec<PathBuf>,
+    concurrency: usize,
+    task: F,
+) -> Result<Vec<PathBuf>, ExportPipelineError>
+where
+    F: Fn(PathBuf) -> Result<Vec<PathBuf>, ExportPipelineError> + Send + Sync + 'static,
+{
+    if paths.is_empty() {
+        return Ok(Vec::new());
+    }
+
+    let worker_count = concurrency.max(1).min(paths.len());
+    let queue = Arc::new(Mutex::new(VecDeque::from(paths)));
+    let results = Arc::new(Mutex::new(Vec::<PathBuf>::new()));
+    let first_error = Arc::new(Mutex::new(None::<ExportPipelineError>));
+    let task = Arc::new(task);
+    let mut handles = Vec::with_capacity(worker_count);
+    const WORKER_STACK_SIZE: usize = 32 * 1024 * 1024;
+
+    for _ in 0..worker_count {
+        let queue = queue.clone();
+        let results = results.clone();
+        let first_error = first_error.clone();
+        let task = task.clone();
+        let worker_name = "export-task".to_string();
+        let handle = std::thread::Builder::new()
+            .name(worker_name.clone())
+            .stack_size(WORKER_STACK_SIZE)
+            .spawn(move || {
+                loop {
+                    if first_error.lock().unwrap().is_some() {
+                        break;
+                    }
+
+                    let next_path = queue.lock().unwrap().pop_front();
+                    let Some(path) = next_path else {
+                        break;
+                    };
+
+                    match task(path) {
+                        Ok(mut generated) => results.lock().unwrap().append(&mut generated),
+                        Err(err) => {
+                            let mut first = first_error.lock().unwrap();
+                            if first.is_none() {
+                                *first = Some(err);
+                            }
+                            break;
+                        }
+                    }
+                }
+            })
+            .map_err(|source| ExportPipelineError::WorkerSpawn {
+                worker: worker_name,
+                source,
+            })?;
+        handles.push(handle);
+    }
+
+    for handle in handles {
+        handle
+            .join()
+            .map_err(|panic| ExportPipelineError::WorkerPanic {
+                worker: "export task".to_string(),
+                message: panic_message(panic),
+            })?;
+    }
+
+    if let Some(err) = first_error.lock().unwrap().take() {
+        return Err(err);
+    }
+
+    let mut results = results.lock().unwrap();
+    Ok(std::mem::take(&mut *results))
+}
+
+fn panic_message(panic: Box<dyn std::any::Any + Send>) -> String {
+    if let Some(message) = panic.downcast_ref::<&str>() {
+        (*message).to_string()
+    } else if let Some(message) = panic.downcast_ref::<String>() {
+        message.clone()
+    } else {
+        "unknown worker panic".to_string()
+    }
+}
+
+pub fn find_files(dir: &Path) -> Result<Vec<PathBuf>, ExportPipelineError> {
+    let mut files = Vec::new();
+    walk(dir, &mut |path| {
+        files.push(path.to_path_buf());
+    })?;
+    Ok(files)
+}
+
+pub fn find_files_by_extension(dir: &Path, ext: &str) -> Result<Vec<PathBuf>, ExportPipelineError> {
+    let target_ext = ext.to_lowercase();
+    let mut files = Vec::new();
+    walk(dir, &mut |path| {
+        if path
+            .extension()
+            .and_then(|value| value.to_str())
+            .map(|value| value.eq_ignore_ascii_case(&target_ext))
+            .unwrap_or(false)
+        {
+            files.push(path.to_path_buf());
+        }
+    })?;
+    Ok(files)
+}
+
+pub fn find_files_by_extensions<P>(
+    dir: &Path,
+    ext: &[P],
+) -> Result<Vec<PathBuf>, ExportPipelineError>
+where
+    P: AsRef<str>,
+{
+    let target_ext = ext
+        .iter()
+        .map(|x| x.as_ref().to_lowercase())
+        .collect::<Vec<_>>();
+    let mut files = Vec::new();
+    walk(dir, &mut |path| {
+        if path
+            .extension()
+            .and_then(|value| value.to_str())
+            .map(|value| target_ext.contains(&value.to_lowercase()))
+            .unwrap_or(false)
+        {
+            files.push(path.to_path_buf());
+        }
+    })?;
+    Ok(files)
+}
+
+fn walk(dir: &Path, f: &mut dyn FnMut(&Path)) -> Result<(), ExportPipelineError> {
+    for entry in std::fs::read_dir(dir).map_err(|source| ExportPipelineError::Io {
+        path: dir.to_path_buf(),
+        source,
+    })? {
+        let entry = entry.map_err(|source| ExportPipelineError::Io {
+            path: dir.to_path_buf(),
+            source,
+        })?;
+        let path = entry.path();
+        let file_type = entry
+            .file_type()
+            .map_err(|source| ExportPipelineError::Io {
+                path: path.clone(),
+                source,
+            })?;
+        if file_type.is_dir() {
+            walk(&path, f)?;
+        } else {
+            f(&path);
+        }
+    }
+    Ok(())
+}
+
+fn remove_file_if_exists(path: &Path) -> Result<(), ExportPipelineError> {
+    if path.exists() {
+        std::fs::remove_file(path).map_err(|source| ExportPipelineError::Io {
+            path: path.to_path_buf(),
+            source,
+        })?;
+    }
+    Ok(())
+}
diff --git a/assets-updater/src/core/media.rs b/assets-updater/src/core/media.rs
new file mode 100644
index 0000000..b79997a
--- /dev/null
+++ b/assets-updater/src/core/media.rs
@@ -0,0 +1,229 @@
+use std::fmt::{Display, Formatter};
+use std::path::Path;
+
+use tokio::process::Command;
+
+use crate::core::config::RetryConfig;
+use crate::core::errors::ExportPipelineError;
+use crate::core::retry::{retry_async, retry_sync};
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub struct FrameRate {
+    pub numerator: i32,
+    pub denominator: i32,
+}
+
+impl FrameRate {
+    pub fn from_tuple((numerator, denominator): (i32, i32)) -> Self {
+        Self {
+            numerator,
+            denominator,
+        }
+    }
+}
+
+impl Display for FrameRate {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        if self.denominator <= 1 {
+            write!(f, "{}", self.numerator)
+        } else {
+            write!(f, "{}/{}", self.numerator, self.denominator)
+        }
+    }
+}
+
+pub async fn convert_usm_to_mp4(
+    usm_file: &Path,
+    mp4_file: &Path,
+    ffmpeg_path: &str,
+    retry: &RetryConfig,
+) -> Result<(), ExportPipelineError> {
+    retry_async(
+        retry,
+        "ffmpeg usm->mp4",
+        |_| async {
+            run_ffmpeg(
+                ffmpeg_path,
+                &[
+                    "-i",
+                    &usm_file.to_string_lossy(),
+                    "-c:v",
+                    "libx264",
+                    "-c:a",
+                    "aac",
+                    "-b:a",
+                    "192k",
+                    "-movflags",
+                    "+faststart",
+                    "-y",
+                    &mp4_file.to_string_lossy(),
+                ],
+            )
+            .run_async()
+            .await
+        },
+        is_retryable_command_error,
+    )
+    .await
+}
+
+pub async fn convert_m2v_to_mp4(
+    m2v_file: &Path,
+    mp4_file: &Path,
+    delete_original: bool,
+    ffmpeg_path: &str,
+    frame_rate: Option<FrameRate>,
+    retry: &RetryConfig,
+) -> Result<(), ExportPipelineError> {
+    let mut args = Vec::new();
+    if let Some(rate) = frame_rate {
+        args.push("-r".to_string());
+        args.push(rate.to_string());
+    }
+    args.push("-i".to_string());
+    args.push(m2v_file.to_string_lossy().to_string());
+    args.push("-c:v".to_string());
+    args.push("libx264".to_string());
+    if let Some(rate) = frame_rate {
+        args.push("-r".to_string());
+        args.push(rate.to_string());
+    }
+    args.push("-y".to_string());
+    args.push(mp4_file.to_string_lossy().to_string());
+
+    retry_async(
+        retry,
+        "ffmpeg m2v->mp4",
+        |_| async {
+            let refs: Vec<&str> = args.iter().map(String::as_str).collect();
+            run_ffmpeg(ffmpeg_path, &refs).run_async().await
+        },
+        is_retryable_command_error,
+    )
+    .await?;
+    if delete_original && m2v_file.exists() {
+        std::fs::remove_file(m2v_file).map_err(|source| ExportPipelineError::Io {
+            path: m2v_file.to_path_buf(),
+            source,
+        })?;
+    }
+    Ok(())
+}
+
+pub fn convert_wav_to_mp3(
+    wav_file: &Path,
+    mp3_file: &Path,
+    ffmpeg_path: &str,
+    retry: &RetryConfig,
+) -> Result<(), ExportPipelineError> {
+    retry_sync(
+        retry,
+        "ffmpeg wav->mp3",
+        |_| {
+            run_ffmpeg_sync(
+                ffmpeg_path,
+                &[
+                    "-i",
+                    &wav_file.to_string_lossy(),
+                    "-b:a",
+                    "320k",
+                    "-y",
+                    &mp3_file.to_string_lossy(),
+                ],
+            )
+        },
+        is_retryable_command_error,
+    )
+}
+
+pub fn convert_wav_to_flac(
+    wav_file: &Path,
+    flac_file: &Path,
+    ffmpeg_path: &str,
+    retry: &RetryConfig,
+) -> Result<(), ExportPipelineError> {
+    retry_sync(
+        retry,
+        "ffmpeg wav->flac",
+        |_| {
+            run_ffmpeg_sync(
+                ffmpeg_path,
+                &[
+                    "-i",
+                    &wav_file.to_string_lossy(),
+                    "-compression_level",
+                    "12",
+                    "-y",
+                    &flac_file.to_string_lossy(),
+                ],
+            )
+        },
+        is_retryable_command_error,
+    )
+}
+
+fn run_ffmpeg<'a>(ffmpeg_path: &'a str, args: &'a [&'a str]) -> FfmpegCommand<'a> {
+    FfmpegCommand { ffmpeg_path, args }
+}
+
+fn run_ffmpeg_sync(ffmpeg_path: &str, args: &[&str]) -> Result<(), ExportPipelineError> {
+    let output = std::process::Command::new(ffmpeg_path)
+        .args(args)
+        .output()
+        .map_err(|source| ExportPipelineError::Spawn {
+            program: ffmpeg_path.to_string(),
+            source,
+        })?;
+    map_command_output(ffmpeg_path, output)
+}
+
+struct FfmpegCommand<'a> {
+    ffmpeg_path: &'a str,
+    args: &'a [&'a str],
+}
+
+impl<'a> FfmpegCommand<'a> {
+    async fn run_async(self) -> Result<(), ExportPipelineError> {
+        let output = Command::new(self.ffmpeg_path)
+            .args(self.args)
+            .output()
+            .await
+            .map_err(|source| ExportPipelineError::Spawn {
+                program: self.ffmpeg_path.to_string(),
+                source,
+            })?;
+        map_command_output(self.ffmpeg_path, output)
+    }
+}
+
+fn is_retryable_command_error(err: &ExportPipelineError) -> bool {
+    match err {
+        ExportPipelineError::Spawn { source, .. } => matches!(
+            source.kind(),
+            std::io::ErrorKind::Interrupted
+                | std::io::ErrorKind::TimedOut
+                | std::io::ErrorKind::WouldBlock
+                | std::io::ErrorKind::BrokenPipe
+                | std::io::ErrorKind::ConnectionReset
+                | std::io::ErrorKind::ConnectionAborted
+                | std::io::ErrorKind::ConnectionRefused
+        ),
+        ExportPipelineError::CommandFailed { .. } => true,
+        _ => false,
+    }
+}
+
+fn map_command_output(
+    program: &str,
+    output: std::process::Output,
+) -> Result<(), ExportPipelineError> {
+    if output.status.success() {
+        Ok(())
+    } else {
+        Err(ExportPipelineError::CommandFailed {
+            program: program.to_string(),
+            status: output.status.to_string(),
+            stderr: String::from_utf8_lossy(&output.stderr).trim().to_string(),
+        })
+    }
+}
diff --git a/assets-updater/src/core/mod.rs b/assets-updater/src/core/mod.rs
new file mode 100644
index 0000000..95d60d8
--- /dev/null
+++ b/assets-updater/src/core/mod.rs
@@ -0,0 +1,7 @@
+pub mod asset_execution;
+pub mod config;
+pub mod export_pipeline;
+pub mod retry;
+pub mod media;
+pub mod codec;
+pub mod errors;
\ No newline at end of file
diff --git a/assets-updater/src/core/retry.rs b/assets-updater/src/core/retry.rs
new file mode 100644
index 0000000..921247f
--- /dev/null
+++ b/assets-updater/src/core/retry.rs
@@ -0,0 +1,83 @@
+use std::fmt::Display;
+use std::future::Future;
+use std::time::Duration;
+use log::warn;
+use tokio::time::sleep;
+
+use crate::core::config::RetryConfig;
+
+pub async fn retry_async<T, E, Op, Fut, ShouldRetry>(
+    config: &RetryConfig,
+    operation: &str,
+    mut op: Op,
+    should_retry: ShouldRetry,
+) -> Result<T, E>
+where
+    E: Display,
+    Op: FnMut(usize) -> Fut,
+    Fut: Future<Output = Result<T, E>>,
+    ShouldRetry: Fn(&E) -> bool,
+{
+    let attempts = config.attempts.max(1);
+    for attempt in 1..=attempts {
+        match op(attempt).await {
+            Ok(value) => return Ok(value),
+            Err(err) if attempt < attempts && should_retry(&err) => {
+                let delay = backoff_delay(config, attempt);
+                warn!(
+                    "operation '{}' failed after {} attempt(s) with error: {}, retrying in {} ms",
+                    operation,
+                    attempt,
+                    err,
+                    delay.as_millis()
+                );
+                sleep(delay).await;
+            }
+            Err(err) => return Err(err),
+        }
+    }
+
+    unreachable!("retry_async must return from within the attempt loop")
+}
+
+pub fn retry_sync<T, E, Op, ShouldRetry>(
+    config: &RetryConfig,
+    operation: &str,
+    mut op: Op,
+    should_retry: ShouldRetry,
+) -> Result<T, E>
+where
+    E: Display,
+    Op: FnMut(usize) -> Result<T, E>,
+    ShouldRetry: Fn(&E) -> bool,
+{
+    let attempts = config.attempts.max(1);
+    for attempt in 1..=attempts {
+        match op(attempt) {
+            Ok(value) => return Ok(value),
+            Err(err) if attempt < attempts && should_retry(&err) => {
+                let delay = backoff_delay(config, attempt);
+                warn!(
+                    "operation '{}' failed after {} attempt(s) with error: {}, retrying in {} ms",
+                    operation,
+                    attempt,
+                    err,
+                    delay.as_millis()
+                );
+                std::thread::sleep(delay);
+            }
+            Err(err) => return Err(err),
+        }
+    }
+
+    unreachable!("retry_sync must return from within the attempt loop")
+}
+
+fn backoff_delay(config: &RetryConfig, attempt: usize) -> Duration {
+    let base = config.initial_backoff_ms.max(1);
+    let max = config.max_backoff_ms.max(base);
+    let multiplier = 1u64
+        .checked_shl(attempt.saturating_sub(1) as u32)
+        .unwrap_or(u64::MAX);
+    Duration::from_millis(base.saturating_mul(multiplier).min(max))
+}
diff --git a/assets-updater/src/lib.rs b/assets-updater/src/lib.rs
new file mode 100644
index 0000000..5a7ca06
--- /dev/null
+++ b/assets-updater/src/lib.rs
@@ -0,0 +1 @@
+pub mod core;
diff --git a/cargo.toml b/cargo.toml
new file mode 100644
index 0000000..e66d993
--- /dev/null
+++ b/cargo.toml
@@ -0,0 +1,28 @@
+[workspace]
+resolver = "3"
+members = ["entry", "common", "assets-updater", "test-main"]
+
+#[profile.dev]
+#codegen-units = 4
+
+[workspace.dependencies]
+anyhow = "1.0.102"
+log = "0.4.29"
+serde = "1.0.228"
+serde_json = "1.0.150"
+tokio = "1.51.0"
+aes = "0.8.4"
+rmp-serde = "1.3.1"
+hex = "0.4.3"
+cbc = "0.1.2"
+tempfile = "3.27.0"
+chrono = "0.4.44"
+reqwest = "0.13.2"
+regex = "1.12.3"
+yaml_serde = "0.10.4"
+image = "0.25.10"
+cridecoder = "0.1.1"
+thiserror = "2.0.18"
+cipher = "0.4.4"
+twox-hash = "2.1.2"
+
diff --git a/common/Cargo.toml b/common/Cargo.toml
new file mode 100644
index 0000000..248f35f
--- /dev/null
+++ b/common/Cargo.toml
@@ -0,0 +1,7 @@
+[package]
+name = "common"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+serde = { workspace = true, features = ["derive"] }
\ No newline at end of file
diff --git a/common/src/lib.rs b/common/src/lib.rs
new file mode 100644
index 0000000..e126084
--- /dev/null
+++ b/common/src/lib.rs
@@ -0,0 +1 @@
+pub mod updater;
\ No newline at end of file
diff --git a/common/src/updater.rs b/common/src/updater.rs
new file mode 100644
index 0000000..568b1d1
--- /dev/null
+++ b/common/src/updater.rs
@@ -0,0 +1,161 @@
+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct SyncContext {
+    pub region: String,
+    #[serde(default)]
+    pub export: RegionExportConfig,
+    #[serde(default)]
+    pub asset_version: Option<String>,
+    #[serde(default)]
+    pub asset_hash: Option<String>,
+    #[serde(default)]
+    pub app_version: Option<String>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize, Default)]
+#[serde(default)]
+pub struct RegionFiltersConfig {
+    #[serde(default)]
+    pub start_app: Vec<String>,
+    #[serde(default)]
+    pub on_demand: Vec<String>,
+    #[serde(default)]
+    pub skip: Vec<String>,
+    #[serde(default)]
+    pub file_ext: Vec<String>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize, Default)]
+#[serde(default)]
+pub struct RegionExportConfig {
+    #[serde(default)]
+    pub usm: UsmExportConfig,
+    #[serde(default)]
+    pub acb: AcbExportConfig,
+    #[serde(default)]
+    pub hca: HcaExportConfig,
+    #[serde(default)]
+    pub images: ImageExportConfig,
+    #[serde(default)]
+    pub video: VideoExportConfig,
+    #[serde(default)]
+    pub audio: AudioExportConfig,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(default)]
+pub struct UsmExportConfig {
+    pub export: bool,
+    pub decode: bool,
+}
+
+impl Default for UsmExportConfig {
+    fn default() -> Self {
+        Self {
+            export: true,
+            decode: true,
+        }
+    }
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(default)]
+pub struct AcbExportConfig {
+    pub export: bool,
+    pub decode: bool,
+}
+
+impl Default for AcbExportConfig {
+    fn default() -> Self {
+        Self {
+            export: true,
+            decode: true,
+        }
+    }
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(default)]
+pub struct HcaExportConfig {
+    pub decode: bool,
+}
+
+impl Default for HcaExportConfig {
+    fn default() -> Self {
+        Self { decode: true }
+    }
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize, Default)]
+#[serde(default)]
+pub struct ImageExportConfig {
+    pub convert_to_webp: bool,
+    pub remove_png: bool,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(default)]
+pub struct VideoExportConfig {
+    pub convert_to_mp4: bool,
+    pub direct_usm_to_mp4_with_ffmpeg: bool,
+    pub remove_m2v: bool,
+}
+
+impl Default for VideoExportConfig {
+    fn default() -> Self {
+        Self {
+            convert_to_mp4: true,
+            direct_usm_to_mp4_with_ffmpeg: false,
+            remove_m2v: true,
+        }
+    }
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(default)]
+pub struct AudioExportConfig {
+    pub convert_to_mp3: bool,
+    pub convert_to_flac: bool,
+    pub remove_wav: bool,
+}
+
+impl Default for AudioExportConfig {
+    fn default() -> Self {
+        Self {
+            convert_to_mp3: true,
+            convert_to_flac: false,
+            remove_wav: true,
+        }
+    }
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct DownloadTask {
+    pub download_path: String,
+    pub bundle_path: String,
+    pub bundle_hash: String,
+    pub category: AssetCategory,
+}
+
+#[derive(Debug, Clone, Serialize, PartialEq, Eq)]
+pub enum AssetCategory {
+    StartApp,
+    OnDemand,
+    Other(String),
+}
+
+impl<'de> Deserialize<'de> for AssetCategory {
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: serde::Deserializer<'de>,
+    {
+        // Treat nil/null as Other("") — matches Go's zero-value coercion.
+        let raw = Option::<String>::deserialize(deserializer)?.unwrap_or_default();
+        Ok(match raw.as_str() {
+            "StartApp" | "startApp" => Self::StartApp,
+            "OnDemand" | "onDemand" => Self::OnDemand,
+            other => Self::Other(other.to_string()),
+        })
+    }
+}
diff --git a/entry/Cargo.toml b/entry/Cargo.toml
new file mode 100644
index 0000000..5ea66fc
--- /dev/null
+++ b/entry/Cargo.toml
@@ -0,0 +1,20 @@
+[package]
+name = "entry"
+version = "0.1.0"
+edition = "2024"
+
+[lib]
+name = "sekai_sync_lib"
+crate-type = ["rlib", "cdylib"]
+
+[dependencies]
+common = { path = "../common" }
+assets-updater = { path = "../assets-updater" }
+
+tokio = { workspace = true, features = ["macros", "rt", "rt-multi-thread"] }
+serde = { workspace = true, features = ["derive"] }
+serde_json = { workspace = true }
+reqwest = { workspace = true, features = ["json"] }
+log = { workspace = true }
+anyhow = { workspace = true }
+simplelog = "0.12.2"
\ No newline at end of file
diff --git a/entry/src/data.rs b/entry/src/data.rs
new file mode 100644
index 0000000..d5eb9ee
--- /dev/null
+++ b/entry/src/data.rs
@@ -0,0 +1,123 @@
+use crate::CONFIG;
+use serde::{Deserialize, Serialize};
+use std::path::PathBuf;
+
+#[derive(Debug)]
+pub struct Config {
+    pub cwd: String,
+    pub name: String,
+    pub as_path: String, // AssetStudio
+}
+impl Config {
+    pub fn cache_dir(&self) -> PathBuf {
+        PathBuf::from(&self.cwd).join("cache").join(&self.name)
+    }
+    pub fn data_dir(&self) -> PathBuf {
+        PathBuf::from(&self.cwd).join("data").join(&self.name)
+    }
+}
+#[derive(Debug, Default)]
+pub struct OptConfig {
+    pub proxy: Option<String>,
+    pub ghp: Option<String>,
+}
+
+impl OptConfig {
+    pub const fn new() -> Self {
+        Self {
+            proxy: None,
+            ghp: None,
+        }
+    }
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct State {
+    pub git_hash: Option<String>,
+    pub master_hash: Option<String>,
+    pub event_id: Option<u64>,
+}
+impl State {
+    fn load(x: &str) -> Self {
+        serde_json::from_str(x).unwrap()
+    }
+
+
+    pub const fn new() -> Self {
+        Self {
+            git_hash: None,
+            master_hash: None,
+            event_id: None,
+        }
+    }
+
+    pub fn init(&mut self) -> anyhow::Result<()> {
+        let path = CONFIG.get().unwrap().data_dir().join("state.json");
+        if path.exists() {
+            let i = Self::load(&std::fs::read_to_string(path)?);
+            self.git_hash = i.git_hash;
+            self.master_hash = i.master_hash;
+            self.event_id = i.event_id;
+        }
+        Ok(())
+    }
+
+    pub fn save(&self) {
+        let d = CONFIG.get().unwrap().data_dir();
+        std::fs::create_dir_all(&d).unwrap();
+        let json = serde_json::to_string(self).unwrap();
+        std::fs::write(d.join("state.json"), json).unwrap();
+    }
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct EventStory {
+    pub id: u64,
+    #[serde(rename = "eventId")]
+    pub event_id: u64,
+    // outline: String,
+    #[serde(rename = "assetbundleName")]
+    pub assetbundle_name: String,
+}
+
+// 用这个找是因为这个文件小一点（（（
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct CardEpisode {
+    pub id: u64,
+    pub seq: u64,
+    #[serde(rename = "cardId")]
+    pub card_id: u64,
+    #[serde(rename = "assetbundleName")]
+    pub assetbundle_name: String,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct EventCard {
+    pub id: u64,
+    #[serde(rename = "cardId")]
+    pub card_id: u64,
+    #[serde(rename = "eventId")]
+    pub event_id: u64,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct CurrentVersion {
+    #[serde(rename = "appHash")]
+    pub app_hash: String,
+    #[serde(rename = "systemProfile")]
+    pub system_profile: String,
+    #[serde(rename = "appVersion")]
+    pub app_version: String,
+    #[serde(rename = "assetVersion")]
+    pub asset_version: String,
+    #[serde(rename = "dataVersion")]
+    pub data_version: String,
+    #[serde(rename = "assetHash")]
+    pub asset_hash: String,
+}
+
+#[derive(Debug, Clone, Serialize)]
+pub struct FetchResult{
+    pub event_id: u64,
+    pub card_paths: Vec<PathBuf>,
+}
\ No newline at end of file
diff --git a/entry/src/download.rs b/entry/src/download.rs
new file mode 100644
index 0000000..978d420
--- /dev/null
+++ b/entry/src/download.rs
@@ -0,0 +1,60 @@
+use crate::{CONFIG, OPT_CONFIG};
+use crate::github::get_master_data;
+use assets_updater::core::asset_execution::AssetExecutionContext;
+use assets_updater::core::config::{AppConfig, CryptoConfig, ExecutionConfig, RegionConfig, RegionProviderConfig, RegionRuntimeConfig, ToolsConfig};
+use assets_updater::core::errors::AssetExecutionError;
+use common::updater::SyncContext;
+use std::path::PathBuf;
+
+pub struct Downloader {
+    exec: AssetExecutionContext,
+    app_config: AppConfig,
+}
+impl Downloader {
+    pub async fn new() -> anyhow::Result<Downloader> {
+        let master_data = get_master_data().await?;
+        let mut execution = ExecutionConfig::default();
+        // if let Ok(opt_conf) = &OPT_CONFIG.read()
+        //     && let Some(proxy) = &opt_conf.proxy
+        // {
+        //     execution.proxy = Some(proxy.to_string());
+        // }
+        let app_config = AppConfig {
+            execution,
+            tools: ToolsConfig{
+                asset_studio_cli_path : Some(CONFIG.get().unwrap().as_path.clone()),
+                ..Default::default()
+            },
+            ..Default::default()
+        };
+
+        let mut exec = AssetExecutionContext::new(&app_config, &SyncContext{
+            region: "jp".to_string(),
+            export: Default::default(),
+            asset_version: Some(master_data.asset_version),
+            asset_hash: Some(master_data.asset_hash),
+            app_version: Some(master_data.app_version),
+        }, &RegionConfig {
+            provider: RegionProviderConfig::ColorfulPalette {
+                asset_info_url_template: "https://{env}-{hash}-assetbundle-info.sekai.colorfulpalette.org/api/version/{asset_version}/{asset_hash}/os/ios".to_owned(),
+                asset_bundle_url_template: "https://{env}-{hash}-assetbundle.sekai.colorfulpalette.org/{asset_version}/{asset_hash}/ios/{bundle_path}".to_owned(),
+                profile_hash: "cf2d2388".to_owned(),
+            },
+            crypto: CryptoConfig{
+                aes_iv_hex: Some("6732666343305a637a4e394d544a3631".to_owned()),
+                aes_key_hex: Some("6d737833495630693958453575595a31".to_owned()),
+            },
+            runtime: RegionRuntimeConfig{
+                unity_version: "2022.3.21f1".to_owned()
+            },
+        })?;
+        exec.fetch_runtime_cookies().await?;
+        Ok(Downloader { exec, app_config })
+    }
+    pub async fn pull(
+        &self,
+        bundle_path: &str,
+    ) -> Result<(PathBuf, /*single file*/ bool), AssetExecutionError> {
+        self.exec.download(bundle_path, &self.app_config).await
+    }
+}
diff --git a/entry/src/github.rs b/entry/src/github.rs
new file mode 100644
index 0000000..3d5892b
--- /dev/null
+++ b/entry/src/github.rs
@@ -0,0 +1,84 @@
+use crate::data::CurrentVersion;
+use crate::{OPT_CONFIG, STORE, UA};
+use anyhow::anyhow;
+use reqwest::Client;
+use serde::Deserialize;
+
+const COMMIT_URL: &str = "https://api.github.com/repos/Team-Haruki/haruki-sekai-master/commits?path=master/events.json&per_page=1";
+
+#[derive(Debug, Deserialize)]
+struct CommitResponse {
+    sha: String,
+}
+
+fn http_client() -> anyhow::Result<Client> {
+    let mut builder = Client::builder();
+    if let Ok(opt_conf) = &OPT_CONFIG.read() {
+        if let Some(proxy) = &opt_conf.proxy {
+            builder = builder.proxy(reqwest::Proxy::all(proxy)?);
+        }
+        if let Some(ghp) = &opt_conf.ghp {
+            builder = builder.default_headers({
+                let mut headers = reqwest::header::HeaderMap::new();
+                headers.insert(
+                    reqwest::header::AUTHORIZATION,
+                    format!("Bearer {ghp}").parse()?,
+                );
+                headers.insert(reqwest::header::USER_AGENT, UA.parse()?);
+                headers
+            });
+        }
+    }
+    Ok(builder.build()?)
+}
+
+pub async fn fetch_last_hash() -> anyhow::Result<String> {
+    let resp = http_client()?.get(COMMIT_URL).send().await?;
+    let text = resp.text().await?;
+    let data: Vec<CommitResponse> = serde_json::from_str(&text)?;
+    Ok(data.first().ok_or(anyhow!(""))?.sha.clone())
+}
+
+pub fn raw_url(path: &str) -> String {
+    "https://raw.githubusercontent.com/Team-Haruki/haruki-sekai-master/refs/heads/main/".to_owned()
+        + path
+}
+
+pub async fn sync_data() -> anyhow::Result<()> {
+    let client = http_client()?;
+    let events_cards = &client
+        .get(raw_url("master/eventCards.json"))
+        .send()
+        .await?
+        .text()
+        .await?;
+    let event_stories = &client
+        .get(raw_url("master/eventStories.json"))
+        .send()
+        .await?
+        .text()
+        .await?;
+    let card_episodes = &client
+        .get(raw_url("master/cardEpisodes.json"))
+        .send()
+        .await?
+        .text()
+        .await?;
+    let mut store = STORE.write().map_err(|e| anyhow!("{}", e))?;
+    store.set_event_cards(serde_json::from_str(events_cards)?);
+    store.set_event_stories(serde_json::from_str(event_stories)?);
+    store.set_card_episodes(serde_json::from_str(card_episodes)?);
+
+    Ok(())
+}
+
+pub async fn get_master_data() -> anyhow::Result<CurrentVersion> {
+    let client = http_client()?;
+    let text = client
+        .get(raw_url("versions/current_version.json"))
+        .send()
+        .await?
+        .text()
+        .await?;
+    Ok(serde_json::from_str(&text)?)
+}
diff --git a/entry/src/lib.rs b/entry/src/lib.rs
new file mode 100644
index 0000000..67e1845
--- /dev/null
+++ b/entry/src/lib.rs
@@ -0,0 +1,125 @@
+mod data;
+mod download;
+mod github;
+mod main_loop;
+mod store;
+
+use crate::data::{Config, FetchResult, OptConfig, State};
+use crate::main_loop::main;
+use crate::store::Store;
+use log::{LevelFilter, debug};
+use simplelog::{ColorChoice, TermLogger, TerminalMode};
+use std::ffi::{CStr, CString, c_char};
+use std::sync::{OnceLock, RwLock};
+use std::thread;
+use std::time::Duration;
+use tokio::runtime::Runtime;
+
+pub static CONFIG: OnceLock<Config> = OnceLock::new();
+pub static OPT_CONFIG: RwLock<OptConfig> = RwLock::new(OptConfig::new());
+pub static PROVIDE: RwLock<Option<FetchResult>> = RwLock::new(None);
+pub static STORE: RwLock<Store> = RwLock::new(Store::new());
+pub static STATE: RwLock<State> = RwLock::new(State::new());
+
+pub const UA: &str = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/149.0.0.0 Safari/537.36";
+
+unsafe fn parse_str(x: *const c_char) -> String {
+    if x.is_null() {
+        return "".to_owned();
+    }
+    let c_str = unsafe { CStr::from_ptr(x) };
+    c_str.to_string_lossy().into_owned()
+}
+
+macro_rules! def_opt_str_setter {
+    ($name: ident) => {
+        /// # Safety
+        #[unsafe(no_mangle)]
+        pub unsafe extern "C" fn $name(x: *const c_char) {
+            let x = unsafe { parse_str(x) };
+            if x.is_empty() {
+                OPT_CONFIG.write().unwrap().$name = None;
+            } else {
+                OPT_CONFIG.write().unwrap().$name = Some(x);
+            }
+        }
+    };
+}
+
+def_opt_str_setter!(proxy);
+def_opt_str_setter!(ghp);
+
+/// # Safety
+#[unsafe(no_mangle)]
+pub unsafe extern "C" fn boot(
+    cwd: *const c_char,
+    name: *const c_char,
+    as_path: *const c_char,
+) -> i32 {
+    unsafe {
+        CONFIG
+            .set(Config {
+                cwd: parse_str(cwd),
+                name: parse_str(name),
+                as_path: parse_str(as_path),
+            })
+            .unwrap();
+    }
+    STATE
+        .write()
+        .unwrap()
+        .init()
+        .expect("Failed to initialize state");
+    *STORE.write().unwrap() = Store::load();
+    // TermLogger::init(
+    //     LevelFilter::Debug,
+    //     simplelog::Config::default(),
+    //     TerminalMode::Mixed,
+    //     ColorChoice::Auto,
+    // )
+    // .unwrap();
+    thread::spawn(|| {
+        let rt = Runtime::new().expect("Failed to create Tokio runtime");
+
+        rt.block_on(keep_loop());
+    });
+
+    0
+}
+
+/// # Safety
+#[unsafe(no_mangle)]
+pub unsafe extern "C" fn fetch_data() -> *mut c_char {
+    let mut provide = PROVIDE.write().unwrap();
+    if provide.is_none() {
+        return std::ptr::null_mut();
+    }
+    let result = provide.take().unwrap();
+    *provide = None;
+
+    let json_string = serde_json::to_string(&result).unwrap();
+
+    let c_str = CString::new(json_string).unwrap();
+    c_str.into_raw()
+}
+
+/// # Safety
+#[unsafe(no_mangle)]
+pub unsafe extern "C" fn free_string(s: *mut c_char) {
+    if s.is_null() {
+        return;
+    }
+    unsafe {
+        let _ = CString::from_raw(s);
+    }
+}
+
+async fn keep_loop() {
+    loop {
+        debug!("loop_start");
+        if let Err(err) = main().await {
+            println!("Error: {}", err);
+        }
+        tokio::time::sleep(Duration::from_secs(60)).await;
+    }
+}
diff --git a/entry/src/main_loop.rs b/entry/src/main_loop.rs
new file mode 100644
index 0000000..7832304
--- /dev/null
+++ b/entry/src/main_loop.rs
@@ -0,0 +1,91 @@
+use crate::data::{FetchResult, State};
+use crate::download::Downloader;
+use crate::github::{fetch_last_hash, sync_data};
+use crate::{CONFIG, PROVIDE, STATE, STORE};
+use anyhow::anyhow;
+use assets_updater::core::export_pipeline::find_files;
+use std::fs;
+use log::debug;
+
+pub async fn main() -> anyhow::Result<()> {
+    let current_hash = fetch_last_hash().await?;
+    let old_state = {
+        let mut l = STATE.read();
+        if l.is_err() {
+            STATE.clear_poison();
+            drop(l);
+            let mut s = STATE.write().map_err(|e| anyhow!("{}", e))?;
+            *s = State::new();
+            let _ = s.init();
+            drop(s);
+            l = STATE.read();
+        }
+        if let Ok(state) = l {
+            state.clone()
+        } else {
+            State::new()
+        }
+    };
+    if let Some(old_hash) = &old_state.git_hash
+        && old_hash == &current_hash
+    {
+        return Ok(());
+    }
+    // hash updated
+
+    sync_data().await?;
+    let store = STORE.read().map_err(|e| anyhow!("{}", e))?;
+    let event = store.find_last_event();
+    if event
+        .as_ref()
+        .zip(old_state.event_id.as_ref())
+        .is_none_or(|(e, id)| &e.event_id == id)
+    {
+        let mut state = STATE.write().map_err(|e| anyhow!("{}", e))?;
+        state.git_hash = Some(current_hash);
+        if let Some(event) = event {
+            state.event_id = Some(event.event_id);
+        }
+        state.save();
+        return Ok(());
+    }
+    let event = event.unwrap();
+    // event updated
+
+    let cards = store.find_cards_by_event(event.event_id);
+    drop(store);
+    let downloader = Downloader::new().await?;
+    let mut images = Vec::new();
+    let cache_dir = CONFIG.get().unwrap().cache_dir();
+    for card in cards {
+        debug!("Pulling card {} from bundle {}", card.card_id, card.assetbundle_name);
+        let dir = downloader
+            .pull(&format!("character/member/{}", card.assetbundle_name))
+            .await?;
+        let files = find_files(&dir.0)?;
+        for file in files {
+            if file.is_file() && file.extension().map(|ext| ext == "png").unwrap_or(false) {
+                let new_filename = format!(
+                    "{}_{}",
+                    card.assetbundle_name,
+                    file.file_name().unwrap().to_str().unwrap()
+                );
+                let new_file = cache_dir.join(new_filename);
+                fs::copy(&file, &new_file)?;
+                fs::remove_file(&file)?;
+                images.push(new_file);
+            }
+        }
+    }
+
+    *PROVIDE.write().map_err(|e| anyhow!("{}", e))? = Some(FetchResult {
+        event_id: event.event_id,
+        card_paths: images,
+    });
+    let mut state = STATE.write().map_err(|e| anyhow!("{}", e))?;
+    state.git_hash = Some(current_hash);
+    state.event_id = Some(event.event_id);
+    state.save();
+
+    Ok(())
+}
diff --git a/entry/src/store.rs b/entry/src/store.rs
new file mode 100644
index 0000000..299df67
--- /dev/null
+++ b/entry/src/store.rs
@@ -0,0 +1,97 @@
+use crate::CONFIG;
+use crate::data::{CardEpisode, EventCard, EventStory};
+use serde::Serialize;
+use serde::de::DeserializeOwned;
+use std::fs;
+use std::path::PathBuf;
+
+#[derive(Debug, Default)]
+pub struct Store {
+    pub event_stories: Vec<EventStory>,
+    pub card_episodes: Vec<CardEpisode>,
+    pub event_cards: Vec<EventCard>,
+}
+
+impl Store {
+    pub const fn new() -> Self {
+        Self {
+            event_cards: Vec::new(),
+            card_episodes: Vec::new(),
+            event_stories: Vec::new(),
+        }
+    }
+
+    pub fn load() -> Self {
+        let cache_dir = CONFIG.get().unwrap().cache_dir();
+
+        // 确保缓存目录存在
+        if !cache_dir.exists() {
+            let _ = fs::create_dir_all(&cache_dir);
+        }
+
+        Self {
+            event_stories: Self::load_file(&cache_dir.join("event_stories.json")),
+            card_episodes: Self::load_file(&cache_dir.join("card_episodes.json")),
+            event_cards: Self::load_file(&cache_dir.join("event_cards.json")),
+        }
+    }
+
+    fn load_file<T: DeserializeOwned>(path: &PathBuf) -> Vec<T> {
+        fs::read_to_string(path)
+            .ok()
+            .and_then(|content| serde_json::from_str(&content).ok())
+            .unwrap_or_default()
+    }
+
+    fn save_file<T: Serialize>(path: &PathBuf, data: &Vec<T>) {
+        if let Ok(content) = serde_json::to_string_pretty(data) {
+            let _ = fs::write(path, content);
+        }
+    }
+
+    pub fn set_event_stories(&mut self, data: Vec<EventStory>) {
+        self.event_stories = data;
+        let path = CONFIG.get().unwrap().cache_dir().join("event_stories.json");
+        Self::save_file(&path, &self.event_stories);
+    }
+
+    pub fn set_card_episodes(&mut self, data: Vec<CardEpisode>) {
+        self.card_episodes = data;
+        let path = CONFIG.get().unwrap().cache_dir().join("card_episodes.json");
+        Self::save_file(&path, &self.card_episodes);
+    }
+
+    pub fn set_event_cards(&mut self, data: Vec<EventCard>) {
+        self.event_cards = data;
+        let path = CONFIG.get().unwrap().cache_dir().join("event_cards.json");
+        Self::save_file(&path, &self.event_cards);
+    }
+
+    pub fn save_all(&self) {
+        let cache_dir = CONFIG.get().unwrap().cache_dir();
+        Self::save_file(&cache_dir.join("event_stories.json"), &self.event_stories);
+        Self::save_file(&cache_dir.join("card_episodes.json"), &self.card_episodes);
+        Self::save_file(&cache_dir.join("event_cards.json"), &self.event_cards);
+    }
+
+    pub fn find_last_event(&self) -> Option<EventStory> {
+        self.event_stories
+            .iter()
+            .max_by_key(|s| s.event_id)
+            .cloned()
+    }
+
+    pub fn find_cards_by_event(&self, event_id: u64) -> Vec<CardEpisode> {
+        self.event_cards
+            .iter()
+            .filter(|e| e.event_id == event_id)
+            .filter_map(|c| {
+                self.card_episodes
+                    .iter()
+                    .rev()
+                    .find(|e| e.card_id == c.card_id)
+            })
+            .cloned()
+            .collect()
+    }
+}
diff --git a/test-main/Cargo.toml b/test-main/Cargo.toml
new file mode 100644
index 0000000..153c785
--- /dev/null
+++ b/test-main/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "test-main"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+entry = { path = "../entry" }
+
+simplelog = "0.12.2"
\ No newline at end of file
diff --git a/test-main/src/main.rs b/test-main/src/main.rs
new file mode 100644
index 0000000..1d9272b
--- /dev/null
+++ b/test-main/src/main.rs
@@ -0,0 +1,30 @@
+use simplelog::{ColorChoice, Config, LevelFilter, TermLogger, TerminalMode};
+use sekai_sync_lib::{boot, ghp, proxy};
+
+fn main() {
+    let _proxy = "http://127.0.0.1:7890";
+    let _cwd = "D:\\Workspace\\sekai-sync-lib\\target";
+    let _name = "sekai-sync-lib";
+    let _as_path = "D:\\Workspace\\AssetStudio\\AssetStudioCLI\\bin\\Release\\net9.0\\AssetStudioModCLI.exe";
+    let _ghp = "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";
+    //
+    // TermLogger::init(
+    //     LevelFilter::Debug,
+    //     Config::default(),
+    //     TerminalMode::Mixed,
+    //     ColorChoice::Auto,
+    // ).unwrap();
+
+    macro_rules! cstr {
+        ($v:expr) => {
+            std::ffi::CString::new($v).unwrap().as_ptr()
+        };
+    }
+    unsafe {
+        proxy(cstr!(_proxy));
+        ghp(cstr!(_ghp));
+        boot(cstr!(_cwd), cstr!(_name), cstr!(_as_path));
+    };
+
+    std::thread::sleep(std::time::Duration::from_hours(10));
+}