fix: 完成下载并发与翻译交接链路

adapters/src/official/backend.rs

@@ -0,0 +1,208 @@
+//! Official resource backend seams.
+//!
+//! The update pipeline consumes these small contracts instead of depending on
+//! one region's URL and catalog rules everywhere.  The JP implementation is
+//! the only production adapter today; adding another region should implement
+//! this module's contracts without changing downloader orchestration.
+
+use super::inventory::{YostarJpPlatformCatalogInventory, YostarJpPlatformDownloadInventory};
+use super::yostar_jp::{
+    is_official_yostar_jp_url, server_info_url, PatchPlatform, YostarJpResourceDiscoveryPlan,
+    YostarJpResourceRoot, YostarJpServerInfo,
+};
+use std::path::{Path, PathBuf};
+
+/// Catalog bytes required to build one platform's download inventory.
+#[derive(Debug, Clone, Copy)]
+pub struct PlatformCatalogInput<'a> {
+    /// Platform represented by the catalog.
+    pub platform: PatchPlatform,
+    /// `BundlePackingInfo.bytes` payload.
+    pub bundle_packing_info: &'a [u8],
+    /// `MediaCatalog.bytes` payload.
+    pub media_catalog: &'a [u8],
+}
+
+/// Region/backend contract used by official resource orchestration.
+pub trait OfficialResourceBackend: Send + Sync {
+    /// Stable backend identifier persisted in diagnostics.
+    fn backend_id(&self) -> &'static str;
+
+    /// Builds the server-info URL from an official metadata file name.
+    fn server_info_url(&self, file_name: &str) -> Result<String, String>;
+
+    /// Selects a discovery plan from server-info and requested platforms.
+    fn discovery_plan(
+        &self,
+        server_info: &YostarJpServerInfo,
+        connection_group: &str,
+        app_version: &str,
+        platforms: &[PatchPlatform],
+    ) -> Result<YostarJpResourceDiscoveryPlan, String>;
+
+    /// Builds platform-aware inventory from the verified seed catalog bytes.
+    fn inventory(
+        &self,
+        table_catalog: &[u8],
+        platform_catalogs: &[PlatformCatalogInput<'_>],
+    ) -> YostarJpPlatformDownloadInventory;
+
+    /// Validates that a URL belongs to this backend's official hosts.
+    fn is_official_url(&self, url: &str) -> bool;
+}
+
+/// URL-to-destination mapping contract for a resource backend.
+pub trait DownloadUrlMapper: Send + Sync {
+    /// Maps an official HTTPS URL to a relative release destination.
+    fn relative_destination(&self, url: &str) -> Result<PathBuf, String>;
+}
+
+/// The currently supported official Blue Archive JP backend.
+#[derive(Debug, Clone, Copy, Default)]
+pub struct YostarJpBackend;
+
+impl OfficialResourceBackend for YostarJpBackend {
+    fn backend_id(&self) -> &'static str {
+        "bluearchive.yostar.jp"
+    }
+
+    fn server_info_url(&self, file_name: &str) -> Result<String, String> {
+        server_info_url(file_name)
+    }
+
+    fn discovery_plan(
+        &self,
+        server_info: &YostarJpServerInfo,
+        connection_group: &str,
+        app_version: &str,
+        platforms: &[PatchPlatform],
+    ) -> Result<YostarJpResourceDiscoveryPlan, String> {
+        server_info.discovery_plan(connection_group, app_version, platforms)
+    }
+
+    fn inventory(
+        &self,
+        table_catalog: &[u8],
+        platform_catalogs: &[PlatformCatalogInput<'_>],
+    ) -> YostarJpPlatformDownloadInventory {
+        let catalogs = platform_catalogs
+            .iter()
+            .map(|catalog| {
+                YostarJpPlatformCatalogInventory::from_catalog_bytes(
+                    catalog.platform,
+                    catalog.bundle_packing_info,
+                    catalog.media_catalog,
+                )
+            })
+            .collect();
+        YostarJpPlatformDownloadInventory::from_catalog_bytes(table_catalog, catalogs)
+    }
+
+    fn is_official_url(&self, url: &str) -> bool {
+        is_official_yostar_jp_url(url)
+    }
+}
+
+impl DownloadUrlMapper for YostarJpBackend {
+    fn relative_destination(&self, url: &str) -> Result<PathBuf, String> {
+        let rest = url
+            .strip_prefix("https://")
+            .ok_or_else(|| format!("官方 URL 必须使用 https：{url}"))?;
+        let (host, path) = rest
+            .split_once('/')
+            .ok_or_else(|| format!("官方 URL 缺少路径：{url}"))?;
+        let mut destination = PathBuf::from(sanitize_component(host, url)?);
+        for segment in path.split('/') {
+            if segment.is_empty() {
+                continue;
+            }
+            destination.push(sanitize_component(segment, url)?);
+        }
+        Ok(destination)
+    }
+}
+
+impl YostarJpBackend {
+    /// Returns the validated resource-root builder for an official root.
+    pub fn resource_root(&self, addressables_root: &str) -> Result<YostarJpResourceRoot, String> {
+        YostarJpResourceRoot::from_addressables_root(addressables_root)
+    }
+}
+
+fn sanitize_component(component: &str, url: &str) -> Result<String, String> {
+    if component == "." || component == ".." || component.is_empty() {
+        return Err(format!("官方 URL 包含不安全路径片段：{url}"));
+    }
+    if component.contains('?') || component.contains('#') || component.contains('\\') {
+        return Err(format!("官方资源 URL 包含不安全路径字符：{url}"));
+    }
+    Ok(component.to_string())
+}
+
+/// Joins a backend-relative destination below an output root.
+pub fn destination_under_root(root: &Path, relative: &Path) -> Result<PathBuf, String> {
+    if relative.is_absolute() {
+        return Err(format!(
+            "backend destination must be relative: {}",
+            relative.display()
+        ));
+    }
+    let destination = root.join(relative);
+    if destination
+        .components()
+        .any(|component| matches!(component, std::path::Component::ParentDir))
+    {
+        return Err(format!(
+            "backend destination escapes output root: {}",
+            relative.display()
+        ));
+    }
+    Ok(destination)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn jp_backend_keeps_discovery_and_inventory_rules_in_one_adapter() {
+        let backend = YostarJpBackend;
+        let server_info = YostarJpServerInfo::from_json(
+            r#"{"ConnectionGroups":[{"Name":"Prod","AddressablesCatalogUrlRoot":"https://prod-clientpatch.bluearchiveyostar.com/r93_fixture"}]}"#,
+        )
+        .unwrap();
+        let plan = backend
+            .discovery_plan(&server_info, "Prod", "1.70.0", &[PatchPlatform::Windows])
+            .unwrap();
+        assert_eq!(backend.backend_id(), "bluearchive.yostar.jp");
+        assert!(backend.is_official_url(&plan.endpoints[0].url));
+
+        let inventory = backend.inventory(
+            b"ExcelDB.db ExcelDB.db",
+            &[PlatformCatalogInput {
+                platform: PatchPlatform::Windows,
+                bundle_packing_info: b"FullPatch_000.zip",
+                media_catalog: b"GameData/Audio/JP.zip",
+            }],
+        );
+        assert_eq!(inventory.table_file_names, vec!["ExcelDB.db"]);
+        assert_eq!(inventory.platform_catalogs.len(), 1);
+    }
+
+    #[test]
+    fn jp_backend_maps_and_rejects_unsafe_destinations() {
+        let backend = YostarJpBackend;
+        assert_eq!(
+            backend
+                .relative_destination(
+                    "https://prod-clientpatch.bluearchiveyostar.com/r93/TableBundles/a.bytes"
+                )
+                .unwrap(),
+            PathBuf::from("prod-clientpatch.bluearchiveyostar.com/r93/TableBundles/a.bytes")
+        );
+        assert!(backend
+            .relative_destination("https://prod-clientpatch.bluearchiveyostar.com/r93/../secret")
+            .is_err());
+        assert!(!backend.is_official_url("https://example.invalid/a"));
+    }
+}