# The provider calls are stdlib urllib, so the image carries nothing beyond the
# web server itself. A service that holds the estate's SendGrid and Twilio
# credentials is the last place to want a wide dependency tree.

FROM python:3.11-slim

ENV PYTHONUNBUFFERED=1 \
    PYTHONDONTWRITEBYTECODE=1 \
    PIP_NO_CACHE_DIR=1

WORKDIR /srv

COPY requirements.txt ./
RUN pip install --no-cache-dir -r requirements.txt

COPY app ./app

# Nothing here needs root, and this process can send mail as the whole estate.
RUN useradd --system --uid 10002 --home /srv channelexit \
    && chown -R channelexit:channelexit /srv
USER channelexit

EXPOSE 8080

HEALTHCHECK --interval=15s --timeout=5s --start-period=10s --retries=3 \
    CMD python -c "import urllib.request,sys; sys.exit(0 if urllib.request.urlopen('http://127.0.0.1:8080/healthz', timeout=4).status == 200 else 1)"

# 0.0.0.0 inside the container only. What keeps this off the internet is the
# published bind address in the compose file, not this line.
CMD ["uvicorn", "--factory", "app.main:asgi", "--host", "0.0.0.0", "--port", "8080"]