package main

import (
"fmt"
"net/http"
"github.com/gorilla/websocket"
)

var upgrader = websocket.Upgrader{
  CheckOrigin: func(r *http.Request) bool {
    // checking conditions
    return true
  },
}

func handleConnections(w http.ResponseWriter, r *http.Request) {
  // upgrade http request to websocket
  ws, err := upgrader.Upgrade(w, r, nil)
  if err != nil {
    fmt.Println(err)
    return
  }
  defer ws.Close()

  // messages
  for {
    messageType, msg, err := ws.ReadMessage()
    if err != nil {
      fmt.Println(err)
      break
    }
    fmt.Printf("Received: %s\n", msg)

    err = ws.WriteMessage(messageType, msg)
    if err != nil {
      fmt.Println(err)
      break
    }
  }
}

func main() {
  http.HandleFunc("/", handleConnections)
  fmt.Println("Server started on :8080")
  err := http.ListenAndServe(":8080", nil)
  if err != nil {
    fmt.Println("Error starting server:", err)
  }
}

https://accounts.google.com/o/oauth2/v2/auth?client_id=YOUR_CLIENT_ID&redirect_uri=YOUR_REDIRECT_URI&response_type=code&scope=email%20profile

POST https://oauth2.googleapis.com/token

{
  "code": "CODE_RECEIVED_FROM_GOOGLE",
  "client_id": "YOUR_CLIENT_ID",
  "client_secret": "YOUR_CLIENT_SECRET",
  "redirect_uri": "YOUR_REDIRECT_URI",
  "grant_type": "authorization_code"
}

GET https://www.googleapis.com/oauth2/v2/userinfo
Authorization: Bearer ACCESS_TOKEN

FROM python:3.11-slim as builder

# avoid stuck build due to user prompt
ARG DEBIAN_FRONTEND=noninteractive

RUN apt-get update && \
    apt-get install -y --no-install-recommends ...

# create and activate virtual environment
RUN python -m venv /home/myuser/venv
ENV PATH="/home/myuser/venv/bin:$PATH"

# install requirements
COPY ./requirements .
RUN pip3 install --upgrade --no-cache-dir pip
RUN pip3 install --no-cache-dir wheel
RUN pip3 install --no-cache-dir -r production.txt

FROM python:3.11-slim

RUN useradd --create-home myuser
COPY --from=builder /home/myuser/venv /home/myuser/venv

USER myuser
RUN mkdir /home/myuser/code
WORKDIR /home/myuser/code
COPY . /home/myuser/code

EXPOSE $DJANGO_PORT

# make sure all messages always reach console
ENV PYTHONUNBUFFERED=1

# activate virtual environment
ENV VIRTUAL_ENV=/home/myuser/venv
ENV PATH="/home/myuser/venv/bin:$PATH"

# /dev/shm is mapped to shared memory and should be used for gunicorn heartbeat
# this will improve performance and avoid random freezes
# CMD ["gunicorn","-b", "0.0.0.0:8000", "-w", "4", "-k", "gevent", "--worker-tmp-dir", "/dev/shm", "--chdir", "config config.wsgi:application"]