feat: local backup (#5054)

* feat: local backup

* refactor(backup): make local backup helpers synchronous and clean up redundant checks

- Converted local backup helpers to synchronous functions to remove unused async warnings and align command signatures.
- Updated list/delete/export commands to call the sync feature functions directly without awaits while preserving behavior.
- Simplified destination directory creation to always ensure parent folders exist without redundant checks, satisfying Clippy.

src-tauri/src/feat/backup.rs

@@ -2,11 +2,24 @@ use crate::{
     config::{Config, IVerge},
     core::backup,
     logging_error,
-    utils::{dirs::app_home_dir, logging::Type},
+    utils::{
+        dirs::{app_home_dir, local_backup_dir},
+        logging::Type,
+    },
 };
-use anyhow::Result;
+use anyhow::{Result, anyhow};
+use chrono::Utc;
 use reqwest_dav::list_cmd::ListFile;
-use std::fs;
+use serde::Serialize;
+use std::{fs, path::PathBuf};
+
+#[derive(Debug, Serialize)]
+pub struct LocalBackupFile {
+    pub filename: String,
+    pub path: String,
+    pub last_modified: String,
+    pub content_length: u64,
+}
 
 /// Create a backup and upload to WebDAV
 pub async fn create_backup_and_upload_webdav() -> Result<()> {
@@ -90,3 +103,147 @@ pub async fn restore_webdav_backup(filename: String) -> Result<()> {
     fs::remove_file(backup_storage_path)?;
     Ok(())
 }
+
+/// Create a backup and save to local storage
+pub fn create_local_backup() -> Result<()> {
+    let (file_name, temp_file_path) = backup::create_backup().map_err(|err| {
+        log::error!(target: "app", "Failed to create local backup: {err:#?}");
+        err
+    })?;
+
+    let backup_dir = local_backup_dir()?;
+    let target_path = backup_dir.join(&file_name);
+
+    if let Err(err) = move_file(temp_file_path.clone(), target_path.clone()) {
+        log::error!(target: "app", "Failed to move local backup file: {err:#?}");
+        // 清理临时文件
+        if let Err(clean_err) = std::fs::remove_file(&temp_file_path) {
+            log::warn!(
+                target: "app",
+                "Failed to remove temp backup file after move error: {clean_err:#?}"
+            );
+        }
+        return Err(err);
+    }
+
+    Ok(())
+}
+
+fn move_file(from: PathBuf, to: PathBuf) -> Result<()> {
+    if let Some(parent) = to.parent() {
+        fs::create_dir_all(parent)?;
+    }
+
+    match fs::rename(&from, &to) {
+        Ok(_) => Ok(()),
+        Err(rename_err) => {
+            // Attempt copy + remove as fallback, covering cross-device moves
+            log::warn!(
+                target: "app",
+                "Failed to rename backup file directly, fallback to copy/remove: {rename_err:#?}"
+            );
+            fs::copy(&from, &to).map_err(|err| anyhow!("Failed to copy backup file: {err:#?}"))?;
+            fs::remove_file(&from)
+                .map_err(|err| anyhow!("Failed to remove temp backup file: {err:#?}"))?;
+            Ok(())
+        }
+    }
+}
+
+/// List local backups
+pub fn list_local_backup() -> Result<Vec<LocalBackupFile>> {
+    let backup_dir = local_backup_dir()?;
+    if !backup_dir.exists() {
+        return Ok(vec![]);
+    }
+
+    let mut backups = Vec::new();
+    for entry in fs::read_dir(&backup_dir)? {
+        let entry = entry?;
+        let path = entry.path();
+        if !path.is_file() {
+            continue;
+        }
+
+        let Some(file_name) = path.file_name().and_then(|name| name.to_str()) else {
+            continue;
+        };
+        let metadata = entry.metadata()?;
+        let last_modified = metadata
+            .modified()
+            .map(|time| chrono::DateTime::<Utc>::from(time).to_rfc3339())
+            .unwrap_or_default();
+        backups.push(LocalBackupFile {
+            filename: file_name.to_string(),
+            path: path.to_string_lossy().to_string(),
+            last_modified,
+            content_length: metadata.len(),
+        });
+    }
+
+    backups.sort_by(|a, b| b.filename.cmp(&a.filename));
+    Ok(backups)
+}
+
+/// Delete local backup
+pub fn delete_local_backup(filename: String) -> Result<()> {
+    let backup_dir = local_backup_dir()?;
+    let target_path = backup_dir.join(&filename);
+    if !target_path.exists() {
+        log::warn!(target: "app", "Local backup file not found: {}", filename);
+        return Ok(());
+    }
+    fs::remove_file(target_path)?;
+    Ok(())
+}
+
+/// Restore local backup
+pub async fn restore_local_backup(filename: String) -> Result<()> {
+    let backup_dir = local_backup_dir()?;
+    let target_path = backup_dir.join(&filename);
+    if !target_path.exists() {
+        return Err(anyhow!("Backup file not found: {}", filename));
+    }
+
+    let verge = Config::verge().await;
+    let verge_data = verge.latest_ref().clone();
+    let webdav_url = verge_data.webdav_url.clone();
+    let webdav_username = verge_data.webdav_username.clone();
+    let webdav_password = verge_data.webdav_password.clone();
+
+    let mut zip = zip::ZipArchive::new(fs::File::open(&target_path)?)?;
+    zip.extract(app_home_dir()?)?;
+    logging_error!(
+        Type::Backup,
+        super::patch_verge(
+            IVerge {
+                webdav_url,
+                webdav_username,
+                webdav_password,
+                ..IVerge::default()
+            },
+            false
+        )
+        .await
+    );
+    Ok(())
+}
+
+/// Export local backup file to user selected destination
+pub fn export_local_backup(filename: String, destination: String) -> Result<()> {
+    let backup_dir = local_backup_dir()?;
+    let source_path = backup_dir.join(&filename);
+    if !source_path.exists() {
+        return Err(anyhow!("Backup file not found: {}", filename));
+    }
+
+    let dest_path = PathBuf::from(destination);
+    if let Some(parent) = dest_path.parent() {
+        fs::create_dir_all(parent)?;
+    }
+
+    fs::copy(&source_path, &dest_path)
+        .map(|_| ())
+        .map_err(|err| anyhow!("Failed to export backup file: {err:#?}"))?;
+    Ok(())
+}