Update from Git Manager GUI

src/backup/BackupManager.js

@@ -0,0 +1,183 @@
+/**
+ * BackupManager — Orchestrates backup operations
+ */
+
+const archiver = require('archiver')
+const { createReadStream, createWriteStream } = require('fs')
+const { mkdir } = require('fs').promises
+const path = require('path')
+const { Transform } = require('stream')
+
+class BackupManager {
+  constructor(provider) {
+    this.provider = provider
+  }
+
+  /**
+   * Create a backup from a project folder
+   * @param {string} projectPath - Path to project folder
+   * @param {string} repoName - Repository name (used for filenames)
+   * @returns {Promise<{filename, size, timestamp}>}
+   */
+  async createBackup(projectPath, repoName) {
+    try {
+      // Create ZIP buffer
+      const buffer = await this._createZip(projectPath)
+      const timestamp = this._getTimestamp()
+      const filename = `${repoName}-backup-${timestamp}.zip`
+
+      // Upload to provider
+      const result = await this.provider.uploadBackup(buffer, filename)
+
+      // Cleanup old backups
+      await this._cleanupOldBackups(repoName)
+
+      return {
+        filename,
+        size: result.size || buffer.length,
+        timestamp
+      }
+    } catch (err) {
+      throw new Error(`Backup creation failed: ${err.message}`)
+    }
+  }
+
+  /**
+   * List all backups for a repository
+   * @param {string} repoName - Repository name
+   * @returns {Promise<Array>}
+   */
+  async listBackups(repoName) {
+    try {
+      const backups = await this.provider.listBackups()
+      return backups
+        .filter(b => b.name.startsWith(repoName))
+        .sort((a, b) => new Date(b.date || b.name) - new Date(a.date || a.name))
+    } catch (err) {
+      throw new Error(`Failed to list backups: ${err.message}`)
+    }
+  }
+
+  /**
+   * Restore a backup to a target folder
+   * @param {string} repoName - Repository name
+   * @param {string} filename - Backup filename
+   * @param {string} targetPath - Target folder path
+   */
+  async restoreBackup(repoName, filename, targetPath) {
+    try {
+      // Download backup
+      const buffer = await this.provider.downloadBackup(filename)
+
+      // Extract ZIP
+      await this._extractZip(buffer, targetPath)
+
+      return { ok: true, restored: filename }
+    } catch (err) {
+      throw new Error(`Restore failed: ${err.message}`)
+    }
+  }
+
+  /**
+   * Delete a backup
+   * @param {string} filename - Backup filename
+   */
+  async deleteBackup(filename) {
+    try {
+      await this.provider.deleteBackup(filename)
+      return { ok: true }
+    } catch (err) {
+      throw new Error(`Delete failed: ${err.message}`)
+    }
+  }
+
+  // ==================== PRIVATE METHODS ====================
+
+  /**
+   * Create ZIP buffer from project folder
+   * Excludes: .git, node_modules, dist, build, .env
+   */
+  async _createZip(projectPath) {
+    return new Promise((resolve, reject) => {
+      const output = []
+      const archive = archiver('zip', { zlib: { level: 5 } })
+
+      archive.on('data', chunk => output.push(chunk))
+      archive.on('end', () => resolve(Buffer.concat(output)))
+      archive.on('error', reject)
+
+      // Add files with exclusions
+      archive.glob('**/*', {
+        cwd: projectPath,
+        ignore: [
+          '.git/**',
+          '.git',
+          'node_modules/**',
+          'node_modules',
+          'dist/**',
+          'dist',
+          'build/**',
+          'build',
+          '.env',
+          '.env.local',
+          '.env.*.local',
+          '*.log',
+          'data/backups/**'
+        ],
+        dot: true
+      })
+
+      archive.finalize()
+    })
+  }
+
+  /**
+   * Extract ZIP buffer to target folder
+   */
+  async _extractZip(buffer, targetPath) {
+    const unzipper = require('unzipper')
+    
+    return new Promise((resolve, reject) => {
+      const { Readable } = require('stream')
+      const stream = Readable.from(buffer)
+
+      stream
+        .pipe(unzipper.Extract({ path: targetPath }))
+        .on('close', resolve)
+        .on('error', reject)
+    })
+  }
+
+  /**
+   * Get ISO timestamp (YYYYMMDD-HHMMSS format)
+   */
+  _getTimestamp() {
+    const now = new Date()
+    const year = now.getFullYear()
+    const month = String(now.getMonth() + 1).padStart(2, '0')
+    const day = String(now.getDate()).padStart(2, '0')
+    const hours = String(now.getHours()).padStart(2, '0')
+    const minutes = String(now.getMinutes()).padStart(2, '0')
+    const seconds = String(now.getSeconds()).padStart(2, '0')
+    
+    return `${year}${month}${day}-${hours}${minutes}${seconds}`
+  }
+
+  /**
+   * Cleanup old backups (keep only last N versions)
+   */
+  async _cleanupOldBackups(repoName, maxVersions = 5) {
+    try {
+      const backups = await this.listBackups(repoName)
+      
+      for (let i = maxVersions; i < backups.length; i++) {
+        await this.provider.deleteBackup(backups[i].name)
+      }
+    } catch (err) {
+      // Silently ignore cleanup errors
+      console.warn(`Cleanup warning: ${err.message}`)
+    }
+  }
+}
+
+module.exports = BackupManager