A backend system for image processing services similar to Cloudinary. This service allows users to upload images, perform various transformations, and retrieve images in different formats.

• User Authentication: Register, login, and secure API endpoints
• Image Management: Upload, transform, retrieve, and list images
• Image Transformations: Resize, crop, rotate, format conversion, and basic filters
• Caching System: Redis-based caching to avoid redundant processing

• Backend Framework: FastAPI
• Database: SQLite (local development) / PostgreSQL (production)
• Storage: Cloudflare R2
• Caching: Redis
• Image Processing: Pillow
• Authentication: JWT
• Deployment: DigitalOcean App Platform with Docker

POST /api/auth/register
POST /api/auth/login

POST /api/images/upload
GET /api/images?page=1&limit=10
GET /api/images/{image_id}
POST /api/images/{image_id}/transform

1. Installation and Setup

   # Clone the repository
   git clone https://github.com/yourusername/cloud-image-api.git
   cd cloud-image-api
   
   # Install dependencies
   pip install -r requirements.txt
   
   # Set up environment variables
   cp .env.example .env.local
   # Edit .env.local with your configuration
   
   # Create database tables
   python setup_db.py
   
   # Start the server
   uvicorn app.main:app --reload

2. Access the API Documentation

   • Open your browser and navigate to http://localhost:8000/docs for the Swagger UI
   • Or visit http://localhost:8000/redoc for the ReDoc documentation

1. Register a New User

   curl -X 'POST' \
     'http://localhost:8000/api/auth/register' \
     -H 'Content-Type: application/json' \
     -d '{
       "username": "testuser",
       "email": "user@example.com",
       "password": "securepassword"
     }'

2. Login and Get Access Token

   curl -X 'POST' \
     'http://localhost:8000/api/auth/login' \
     -H 'Content-Type: application/x-www-form-urlencoded' \
     -d 'username=testuser&password=securepassword'

   Save the returned access token for use in subsequent requests:

   {
     "access_token": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...",
     "token_type": "bearer"
   }

For all image operations, you'll need to include the access token in the Authorization header:

Authorization: Bearer YOUR_ACCESS_TOKEN

1. Upload an Image

   curl -X 'POST' \
     'http://localhost:8000/api/images/upload' \
     -H 'Authorization: Bearer YOUR_ACCESS_TOKEN' \
     -F 'file=@/path/to/your/image.jpg'

   This will return the image metadata including the id which you'll need for transformations.

2. List Your Images

   curl -X 'GET' \
     'http://localhost:8000/api/images?page=1&limit=10' \
     -H 'Authorization: Bearer YOUR_ACCESS_TOKEN'

   Use the page and limit parameters to paginate through your images.

3. Get a Specific Image

   curl -X 'GET' \
     'http://localhost:8000/api/images/1' \
     -H 'Authorization: Bearer YOUR_ACCESS_TOKEN'

   Replace 1 with the actual image ID.

4. Transform an Image

   curl -X 'POST' \
     'http://localhost:8000/api/images/1/transform' \
     -H 'Authorization: Bearer YOUR_ACCESS_TOKEN' \
     -H 'Content-Type: application/json' \
     -d '{
       "operations": [
         {
           "type": "resize",
           "width": 500,
           "height": 300,
           "maintain_aspect": true
         },
         {
           "type": "filter",
           "filter": "grayscale"
         }
       ]
     }'

   This will return a URL to the transformed image.

The API supports the following transformation operations:

1. Resize

   {
     "type": "resize",
     "width": 500,
     "height": 300,
     "maintain_aspect": true
   }

   Parameters:

   • width: Target width in pixels
   • height: Target height in pixels
   • maintain_aspect: Whether to maintain aspect ratio (default: true)

2. Crop

   {
     "type": "crop",
     "x": 100,
     "y": 100,
     "width": 300,
     "height": 300
   }

   Parameters:

   • x: Left coordinate
   • y: Top coordinate
   • width: Crop width
   • height: Crop height

3. Rotate

   {
     "type": "rotate",
     "angle": 90,
     "expand": true
   }

   Parameters:

   • angle: Rotation angle in degrees
   • expand: Whether to expand the output to fit the rotated image (default: false)

4. Format Conversion

   {
     "type": "format",
     "format": "webp",
     "quality": 85
   }

   Parameters:

   • format: Target format (jpeg, jpg, png, webp, gif)
   • quality: Output quality for JPEG and WebP (1-100, default: 85)

5. Filters

   {
     "type": "filter",
     "filter": "grayscale"
   }

   Parameters:

   • filter: Filter type (grayscale, sepia, blur, sharpen)

You can apply multiple transformations in sequence:

{
  "operations": [
    {
      "type": "resize",
      "width": 500
    },
    {
      "type": "rotate",
      "angle": 90
    },
    {
      "type": "filter",
      "filter": "sepia"
    },
    {
      "type": "format",
      "format": "webp",
      "quality": 90
    }
  ]
}

Transformations are applied in the order they are specified.

• Python 3.11+
• Redis
• Cloudflare R2 account
• Docker and Docker Compose (for local containerized development)

1. Clone the repository

git clone https://github.com/yourusername/cloud-image-api.git
cd cloud-image-api

2. Create a virtual environment and install dependencies

python -m venv venv
source venv/bin/activate  # On Windows: venv\Scripts\activate
pip install -r requirements.txt

3. Set up environment variables

cp .env.example .env.local
# Edit .env.local with your configuration

4. Run database migrations

alembic upgrade head

5. Start the development server

uvicorn app.main:app --reload

1. Clone the repository

git clone https://github.com/yourusername/cloud-image-api.git
cd cloud-image-api

2. Set up environment variables

cp .env.example .env.local
# Edit .env.local with your configuration

3. Build and start the Docker containers

docker-compose up -d

4. Access the API documentation at http://localhost:8000/docs

Run the test suite with:

pytest

Detailed deployment instructions for DigitalOcean App Platform are available in the DEPLOYMENT.md file.