Dockerfile

# Multi-stage build for FastAPI with mTLS support
FROM python:3.11-slim as builder

# Set environment variables
ENV PYTHONUNBUFFERED=1 \
    PYTHONDONTWRITEBYTECODE=1 \
    PIP_NO_CACHE_DIR=1 \
    PIP_DISABLE_PIP_VERSION_CHECK=1

# Install system dependencies
RUN apt-get update && apt-get install -y \
    build-essential \
    libssl-dev \
    libffi-dev \
    && rm -rf /var/lib/apt/lists/*

# Create and activate virtual environment
RUN python -m venv /opt/venv
ENV PATH="/opt/venv/bin:$PATH"

# Install Python dependencies
COPY requirements.txt .
RUN pip install --upgrade pip && \
    pip install -r requirements.txt

# Production stage
FROM python:3.11-slim

# Set environment variables
ENV PYTHONUNBUFFERED=1 \
    PYTHONDONTWRITEBYTECODE=1 \
    PATH="/opt/venv/bin:$PATH"

# Install runtime dependencies
RUN apt-get update && apt-get install -y \
    openssl \
    ca-certificates \
    && rm -rf /var/lib/apt/lists/*

# Copy virtual environment from builder stage
COPY --from=builder /opt/venv /opt/venv

# Create non-root user for security
RUN groupadd -r fastapi && useradd -r -g fastapi -d /app -s /bin/bash fastapi

# Create application directory
WORKDIR /app

# Create certificates directory with proper permissions
RUN mkdir -p /app/certs/{ca,server,client} && \
    chown -R fastapi:fastapi /app/certs

# Copy application code
COPY --chown=fastapi:fastapi main.py server.py ./

# Copy entrypoint script
COPY --chown=fastapi:fastapi docker-entrypoint.sh ./
RUN chmod +x docker-entrypoint.sh

# Switch to non-root user
USER fastapi

# Expose HTTPS port
EXPOSE 8443

# Health check
HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
    CMD python -c "import requests; requests.get('https://localhost:8443/health', cert=('./certs/client/client-cert.pem', './certs/client/client-key.pem'), verify='./certs/ca/ca-cert.pem')" || exit 1

# Use entrypoint script
ENTRYPOINT ["./docker-entrypoint.sh"]

# Default command
CMD ["python", "server.py"]