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version: "1.0.1" name: bkend-storage classification: capability classification-reason: Pattern guidance may overlap with model's built-in knowledge as it improves deprecation-risk: medium effort: medium description: | bkend.ai file storage — upload (presigned URL), download (CDN), visibility levels, buckets. Triggers: bkend file, upload, download, presigned URL, storage, 파일 업로드, 스토리지. user-invocable: false agent: bkit:bkend-expert allowed-tools:
- Read
- Write
- Edit
- Glob
- Grep
- Bash
- mcp__bkend__*
imports:
- ${PLUGIN_ROOT}/templates/shared/bkend-patterns.md
bkend.ai Storage Guide
Upload Methods
| Method | Use Case | Process | |
|---|---|---|---|
| Single | Normal files | Presigned URL -> PUT upload -> Register metadata | |
| Multiple | Multiple files | Repeat single upload | |
| Multipart | Large files | Initialize -> Part URLs -> Complete |
Presigned URL
- Validity: 15 minutes
- PUT method with file binary
- Content-Type header required
File Visibility (4 levels)
| Level | Access | URL Type | |
|---|---|---|---|
| public | Anyone | CDN URL (no expiry) | |
| private | Owner only | Presigned URL (1 hour) | |
| protected | Authenticated users | Presigned URL (1 hour) | |
| shared | Specified targets | Presigned URL (1 hour) |
Size Limits
| Category | Max Size | |
|---|---|---|
| Images | 10 MB | |
| Videos | 100 MB | |
| Documents | 20 MB |
Storage Categories
images, documents, media, attachments
MCP Storage Workflow
bkend MCP does NOT have dedicated storage tools. Use this workflow:
- Search docs:
search_docswith query "file upload presigned url" - Get examples:
search_docswith query "file upload code examples" - Generate code: AI generates REST API code for file operations
Searchable Storage Docs
| Doc ID | Content | |
|---|---|---|
7_code_examples_data | CRUD + file upload code examples |
REST Storage API
| Method | Endpoint | Description | |
|---|---|---|---|
| POST | /v1/files/presigned-url | Generate presigned URL | |
| POST | /v1/files | Register metadata (complete upload) | |
| GET | /v1/files | File list | |
| GET | /v1/files/:fileId | File detail | |
| PATCH | /v1/files/:fileId | Update metadata | |
| DELETE | /v1/files/:fileId | Delete file | |
| POST | /v1/files/:fileId/download-url | Generate download URL |
Multipart Upload (Large Files)
| Method | Endpoint | Description | |
|---|---|---|---|
| POST | /v1/files/multipart/init | Initialize multipart upload | |
| POST | /v1/files/multipart/presigned-url | Get part upload URL | |
| POST | /v1/files/multipart/complete | Complete multipart upload | |
| POST | /v1/files/multipart/abort | Abort multipart upload |
Upload Flow (Single File)
1. POST /v1/files/presigned-url -> { url, fileId }2. PUT {url} with file binary + Content-Type header3. POST /v1/files with { fileId, filename, contentType, size, visibility }
Multipart Upload Flow (Large File)
1. POST /v1/files/multipart/init -> { uploadId }2. POST /v1/files/multipart/presigned-url -> [{ partNumber, url }]3. PUT each part URL with file chunk4. POST /v1/files/multipart/complete -> { file }
Official Documentation (Live Reference)
For the latest storage documentation, use WebFetch:
- Storage Overview: https://raw.githubusercontent.com/popup-studio-ai/bkend-docs/main/en/storage/01-overview.md
- MCP Storage Guide: https://raw.githubusercontent.com/popup-studio-ai/bkend-docs/main/en/mcp/07-storage-tools.md
- Full TOC: https://raw.githubusercontent.com/popup-studio-ai/bkend-docs/main/SUMMARY.md