Image Uploader with Multi-Upload & Slideshow

A self-hosted image uploader with multi-image upload capabilities and automatic slideshow functionality.

Features

Multi-Image Upload: Upload multiple images at once with batch processing
Drag-and-Drop Reordering: 🆕 Admins can reorder images via intuitive drag-and-drop interface
Slideshow Mode: Automatic fullscreen slideshow with smooth transitions (respects custom ordering)
Preview Image Optimization: Automatic thumbnail generation for faster gallery loading (96-98% size reduction)
Touch-Friendly Interface: 🆕 Mobile-optimized drag handles and responsive design
Admin Panel: Dedicated moderation interface for content management and organization
Persistent Storage: Docker volumes ensure data persistence across restarts
Clean UI: Minimalist design focused on user experience
Self-Hosted: Complete control over your data and infrastructure
Lightweight: Built with modern web technologies for optimal performance

What's New

This project extends the original Image-Uploader by vallezw with enhanced multi-upload and slideshow capabilities.

🆕 Latest Features (November 2025)

• Image Descriptions: 🆕 Add optional descriptions to individual images (max 200 characters)
• Edit Mode: Edit descriptions for uploaded images in upload preview and moderation interface
• Slideshow Display: Image descriptions shown as overlays during slideshow presentation
• Public Display: Descriptions visible in public group views and galleries

Previous Features (October 2025)

• Drag-and-Drop Image Reordering: Admins can now reorder images using intuitive drag-and-drop
• Touch-Friendly Interface: Mobile-optimized controls with always-visible drag handles
• Slideshow Integration: Custom image order automatically applies to slideshow mode
• Optimistic UI Updates: Immediate visual feedback with error recovery
• Comprehensive Admin Panel: Dedicated moderation interface for content curation

Core Features

• Multi-image batch upload with progress tracking
• Automatic slideshow presentation mode
• Image grouping with descriptions and metadata
• Random slideshow rotation with custom ordering support
• Keyboard navigation support (Slideshow: Space/Arrow keys, Escape to exit)
• Mobile-responsive design with touch-first interactions

Quick Start

Docker Deployment (Recommended)

Production Environment

# Start production environment
./prod.sh

# Or manually:
docker compose -f docker/prod/docker-compose.yml up -d

Development Environment

# Start development environment  
./dev.sh

# Or manually:
docker compose -f docker/dev/docker-compose.yml up -d
### Access URLs

#### Production (Port 80):
- Upload Interface: `http://localhost`
- Slideshow Mode: `http://localhost/slideshow`
- Groups Overview: `http://localhost/groups`
- Admin Panel: `http://localhost/moderation` (requires authentication)

#### Development (Port 3000):
- Upload Interface: `http://localhost:3000`
- Backend API: `http://localhost:5001`
- Slideshow Mode: `http://localhost:3000/slideshow`

### Multi-Image Upload

1. Visit `http://localhost`
2. Drag & drop multiple images or click to select
3. Add an optional description for your image collection
4. Click "Upload Images" to process the batch
5. Images are automatically grouped for slideshow viewing

### Slideshow Mode

- **Automatic Access**: Navigate to `http://localhost/slideshow`  
- **Features**:
  - Fullscreen presentation
  - 4-second display per image            
  - Automatic progression through all slideshow collections
  - Random selection of next slideshow after completing current one
  - Smooth fade transitions (0.5s)  

- **Keyboard Controls**:
  - **ESC**: Exit slideshow / Return to upload page
  - **Spacebar / Arrow Right**: Manually advance to next image
  - **Home Button**: Return to main upload interface

### Preview Image Optimization

The application automatically generates optimized preview thumbnails for all uploaded images to significantly improve gallery loading performance.

- **Automatic Generation**:
  - Preview images are created automatically on server startup
  - Existing images without previews are processed on-demand
  - New uploads generate previews immediately during upload

- **Technical Specifications**:
  - **Max Width**: 800px (maintains aspect ratio)
  - **Format**: JPEG with 85% quality
  - **Size Reduction**: 96-98% smaller than originals (e.g., 2076KB → 58.5KB)
  - **Performance**: ~30x faster gallery loading times

- **Smart Image Loading**:
  - **Galleries & Overview**: Load lightweight preview images (~50-100KB)
  - **Slideshow Mode**: Uses full-resolution originals for best quality
  - **Fallback**: Automatically uses originals if preview generation fails

- **Storage**:
  - Originals: `backend/src/data/images/` (~2-4MB per image)
  - Previews: `backend/src/data/previews/` (~50-100KB per image)
  - Database: `preview_path` column stores preview filename

### Moderation Interface (Protected)

- **Access**: `http://localhost/moderation` (requires authentication)
- **Authentication**: HTTP Basic Auth (username: admin, password: set during setup)
- **Features**:
  - Review pending image groups before public display
  - Approve or reject submitted collections
  - Delete individual images from approved groups  
  - View group details (title, creator, description, image count)
  - Bulk moderation actions

- **Security Features**:
  - Password protected access via nginx HTTP Basic Auth
  - Hidden from search engines (`robots.txt` + `noindex` meta tags)
  - No public links or references in main interface    

### Public Overview of all approved slideshows 
- **Group Management**: Navigate to `http://localhost/groups`
  - Overview of all approved slideshow collections
  - Launch slideshow mode from any group
  - View group statistics and metadata
     

## Docker Structure

The application uses separate Docker configurations for development and production:

docker/ ├── .env.backend.example # Backend environment variables documentation ├── .env.frontend.example # Frontend environment variables documentation ├── dev/ # Development environment │ ├── docker-compose.yml # Development services configuration │ ├── backend/ │ │ ├── config/.env # Development backend configuration │ │ └── Dockerfile # Development backend container │ └── frontend/ │ ├── config/.env # Development frontend configuration │ ├── config/env.sh # Runtime configuration script │ ├── Dockerfile # Development frontend container │ ├── nginx.conf # Development nginx configuration │ └── start.sh # Development startup script └── prod/ # Production environment ├── docker-compose.yml # Production services configuration ├── backend/ │ ├── config/.env # Production backend configuration │ └── Dockerfile # Production backend container └── frontend/ ├── config/.env # Production frontend configuration ├── config/env.sh # Runtime configuration script ├── config/htpasswd # HTTP Basic Auth credentials ├── Dockerfile # Production frontend container └── nginx.conf # Production nginx configuration

### Environment Configuration

- **Development**: Uses `docker/dev/` configuration with live reloading
- **Production**: Uses `docker/prod/` configuration with optimized builds
- **Scripts**: Use `./dev.sh` or `./prod.sh` for easy deployment

## Data Structure 

Data are stored in sqlite database. The structure is as follows:
``` sql
CREATE TABLE groups (
                    id INTEGER PRIMARY KEY AUTOINCREMENT,
                    group_id TEXT UNIQUE NOT NULL,
                    year INTEGER NOT NULL,
                    title TEXT NOT NULL,
                    description TEXT,
                    name TEXT,
                    upload_date DATETIME NOT NULL,
                    approved BOOLEAN DEFAULT FALSE,
                    created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
                    updated_at DATETIME DEFAULT CURRENT_TIMESTAMP
                );
CREATE TABLE sqlite_sequence(name,seq);
CREATE TABLE images (
                    id INTEGER PRIMARY KEY AUTOINCREMENT,
                    group_id TEXT NOT NULL,
                    file_name TEXT NOT NULL,
                    original_name TEXT NOT NULL,
                    file_path TEXT NOT NULL,
                    preview_path TEXT,
                    upload_order INTEGER NOT NULL,
                    file_size INTEGER,
                    mime_type TEXT,
                    created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
                    FOREIGN KEY (group_id) REFERENCES groups(group_id) ON DELETE CASCADE
                );
CREATE INDEX idx_groups_group_id ON groups(group_id);
CREATE INDEX idx_groups_year ON groups(year);
CREATE INDEX idx_groups_upload_date ON groups(upload_date);
CREATE INDEX idx_images_group_id ON images(group_id);
CREATE INDEX idx_images_upload_order ON images(upload_order);
CREATE TRIGGER update_groups_timestamp 
                AFTER UPDATE ON groups
                FOR EACH ROW
                BEGIN
                    UPDATE groups SET updated_at = CURRENT_TIMESTAMP WHERE id = NEW.id;
                END;

Architecture

Backend (Node.js + Express)

• Multi-upload API: /api/upload/batch - Handles batch file processing
• Groups API: /api/groups - Retrieves slideshow collections
• Preview Generation: Automatic thumbnail creation using Sharp (800px JPEG, 85% quality)
• File Storage: Organized in /upload directory (originals) and /data/previews (thumbnails)
• Database Storage: sqlite database in /app/src/data/db/image_uploader.db

Frontend (React + Material-UI)

• Multi-Upload Interface: Drag & drop with preview gallery
• Progress Tracking: Real-time upload status
• Spacebar / Arrow Right: Manually advance to next image
• Slideshow Engine: Fullscreen presentation with automatic progression
• Responsive Design: Mobile and desktop optimized
• Home Button: Return to main upload interface

Storage Architecture

Docker Volume (app-data)
src
└── app
    ├── src
        ├── upload (originals, ~2-4MB each)
        │   ├── ZMmHXzHbqw.jpg
        │   ├── tjjnngOmXS.jpg
        │   └── ...
        └── data
            ├── previews (thumbnails, ~50-100KB each)
            │   ├── ZMmHXzHbqw.jpg
            │   ├── tjjnngOmXS.jpg
            │   └── ...
            └── db
                └── image_uploader.db

Hosting it with Docker

• Frontend: React 17, Material-UI, React Router
• Backend: Node.js, Express, Multer (file handling)
• Containerization: Docker, Docker Compose
• Reverse Proxy: nginx (routing & file serving)[In order to host the project you will need to create a docker-compose file. These files are combining multiple docker images to interact with each other.
• File Upload: Drag & drop with react-dropzone
• Notifications: SweetAlert2

API Endpoints

Upload Operations

• POST /api/upload/batch - Upload multiple images with description
• GET /api/groups - Retrieve all slideshow groups
• GET /api/groups/:id - Get specific slideshow group

Moderation Operations (Protected)

• GET /moderation/groups - Get all groups pending moderation
• POST /groups/:id/approve - Approve a group for public display
• DELETE /groups/:id - Delete an entire group
• DELETE /groups/:id/images/:imageId - Delete individual image from group

File Access

• GET /api/upload/:filename - Access uploaded image files (legacy, use /api/download instead)
• GET /api/download/:filename - Download original full-resolution images
• GET /api/previews/:filename - Access optimized preview thumbnails (~100KB, 800px width)

Configuration

Environment Variables

Variable	Default	Description
API_URL	http://localhost:5000	Backend API endpoint
CLIENT_URL	http://localhost	Frontend application URL

Volume Configuration

• Upload Limits: 100MB maximum file size for batch uploads
• Supported Formats: JPG, JPEG, PNG, GIF, WebP

Backup & Restore

Backup slideshow data

docker cp image-uploader-backend:/usr/src/app/src/data/ ./image-uploader-backup-data

Restore slideshow data

docker cp ./image-uploader-backup-data image-uploader-backend:/usr/src/app/src/data

Contributing

Contributions are welcome!
This project extends the original work by vallezw.

Development Setup

1. Fork the repository
2. Create feature branch: git checkout -b feature/amazing-feature
3. Commit changes: git commit -m 'Add amazing feature'
4. Push to branch: git push origin feature/amazing-feature| Field | Type | Description |#### Changing the URL
5. Open a Pull Request

License

This project is distributed under the MIT License. See LICENSE for more information.

Acknowledgments

• Original project: Image-Uploader by vallezw