feat: add file and folder duplicate/copy operation

[G4brym]

Summary

• Adds a "Duplicate" option to the file/folder context menu that creates a copy with a " (copy)" suffix, preserving all metadata
• New CopyObject backend endpoint (POST /api/buckets/:bucket/copy) that gets the source object and puts it at the destination without deleting the original
• Frontend handles both single file duplication (instant) and folder duplication (iterates contents with progress indicator)

Related Issue

Prodboard issue: bcb8905b3911e595 — [I] [R2-Explorer] Add file and folder duplicate/copy operation

Changes

• New file: packages/worker/src/modules/buckets/copyObject.ts — CopyObject endpoint following MoveObject pattern (without delete)
• Modified: packages/worker/src/index.ts — Register /api/buckets/:bucket/copy route
• Modified: packages/dashboard/src/appUtils.js — Add copyObject API handler method
• Modified: packages/dashboard/src/pages/files/FileContextMenu.vue — Add "Duplicate" menu item
• Modified: packages/dashboard/src/components/files/FileOptions.vue — Add duplicateObject and generateCopyName methods
• Modified: packages/dashboard/src/pages/files/FilesFolderPage.vue — Wire up duplicateObject event
• New file: packages/worker/tests/integration/copy.test.ts — 6 backend integration tests
• Modified: packages/dashboard/e2e/file-operations.spec.ts — E2E test for file duplication via context menu

Test Plan

• All 88 worker integration tests pass (including 6 new copy tests)
• All 110 dashboard component tests pass
• Lint passes cleanly
• E2E tests for file duplication via context menu
• Manual test: right-click file → Duplicate → verify copy appears with " (copy)" suffix
• Manual test: right-click folder → Duplicate → verify folder and contents are copied
• Verify readonly mode blocks the copy endpoint (POST is blocked by readonly middleware)

🤖 Generated with Claude Code

[cloudflare-workers-and-pages]

Deploying with    Cloudflare Workers

The latest updates on your project. Learn more about integrating Git with Workers.

Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	r2-explorer-docs	8b6656a	Commit Preview URL Branch Preview URL	Mar 10 2026, 12:06 AM

[G4brym]

Automated Code Review — APPROVED ✅

Review Scores: 5/5 reviewers approved
CI Status: All checks passed ✅

Summary

Clean, well-implemented feature that adds file/folder duplication to R2-Explorer. The implementation closely follows established codebase patterns (mirrors MoveObject endpoint and folder delete iteration). Backend endpoint correctly implements copy semantics (get + put without delete), preserving all metadata. Frontend adds context menu integration with progress feedback for folder operations. Test coverage is solid with 6 backend integration tests and an E2E test.

Review Perspectives

1. Correctness: ✅ Copy semantics correct (no source deletion), name generation handles files/folders/extensions properly, events wired correctly through component hierarchy
2. Security: ✅ Follows existing auth/middleware patterns, POST blocked by readonly middleware, no injection surfaces, base64 encoding matches existing patterns
3. Performance: ✅ Single-file copy streams via R2 get/put (no memory buffering), folder copy matches existing sequential pattern
4. Code Quality: ✅ Mirrors existing codebase patterns closely, clean and readable, well-structured
5. Testing: ✅ 6 backend integration tests covering happy path, metadata preservation, error cases, and source integrity; E2E test covers primary user flow

Minor Notes (non-blocking)

• Number.parseInt((i * 100) / folderContents.length) works but Math.floor() would be semantically more appropriate for truncating a number
• generateCopyName uses arrow function syntax while sibling methods use function() — inconsistent but harmless since it doesn't reference this
• Silent overwrite if filename (copy).ext already exists is a documented, acceptable trade-off for MVP

🤖 Automated review by prodboard