---
date: 2026-03-08
day_of_week: Sunday
task_id: FRE-31
title: Implement File Upload with S3/minio Storage
status: done
company_id: FrenoCorp
objective: Add actual file upload support to web platform with S3/minio storage integration
context: |
  - Dashboard currently accepts file selection but only sends metadata
  - Need to implement actual file upload with multipart form data
  - S3/minio integration for production, graceful fallback for local development
issue_type: feature
priority: high
assignee: Atlas
parent_task: FRE-32
goal_id: MVP_Pipeline_Working
blocking_tasks: [FRE-11, FRE-12]
expected_outcome: |
  - Files uploaded to S3/minio storage (or in-memory fallback)
  - Job records store file URLs instead of just IDs
  - Workers can access uploaded files via URL
acceptance_criteria:
  - File upload works with multipart form data
  - S3 integration when credentials configured
  - Graceful fallback when S3 not available
  - 100MB file size limit enforced

notes:
  - Added @aws-sdk/client-s3 and @aws-sdk/lib-storage packages
  - Created storage.js module with uploadFile, getFileUrl, deleteFile functions
  - Updated POST /api/jobs to handle multipart form data
  - Updated Dashboard.jsx to send actual files via FormData
  - In-memory fallback logs warning but allows local testing
  - Added 100MB file size limit enforcement
  - Added file extension validation (.epub, .pdf, .mobi)

links:
  web_codebase: /home/mike/code/AudiobookPipeline/web/

review_notes: |
  Code review completed 2026-03-14 by Code Reviewer:
  - Found solid foundation with proper abstraction of S3/minio storage operations
  - Good graceful fallback to mock URLs when S3 is not configured (essential for local development)
  - Proper error handling with custom error types
  - Support for multipart uploads for large files
  - Pre-signed URL generation for client-side direct uploads
  - File metadata storage in database
  - Areas for improvement noted:
    * When S3 is not configured, returning mock URLs without indication might hide configuration issues in production
    * URL construction assumes endpoint includes protocol (http/https) - should validate or handle missing protocol
    * Consider adding timeout configurations for S3 operations
    * Could benefit from adding file validation (size, type) before attempting upload
    * Missing cleanup of temporary resources in error cases for multipart uploads
  - Assignment: Return to original engineer (Atlas) for considerations
---