server.py

import time
from datetime import datetime
from flask import Flask, request

app = Flask(__name__)
messages = [
    {"username": "Jack", "text": "Hello!", "time": time.time()},
    {"username": "Mary", "text": "Hi, Jack!", "time": time.time()},
]

users = {
    'Jack': '12345',
    'Mary': '54321'
}

@app.route("/")
def hello():
    return "Hello, <h1>Welcom to Python meessenger!</h1>!"


@app.route("/status")
def status():
    return {
        "status": True,
        'time': datetime.now().strftime("%H:%M:%S %d.%m.%Y")
    }

@app.route("/messages")
def messages_view():
    """
    Получение сообщений после отметки after
    input: after - отметка времени
    :return: {
        "messages": [
            {"username": str, "text": str, "time": float},
            ...
        ]
    }
    """
    after = float(request.args['after'])
    new_messages = [message for message in messages if message['time'] > after]
    return {"messages": new_messages}


@app.route("/send", methods=['POST'])
def send_view():
    """
    Отправка сообщений
    input: {
        "username": str,
        "text": str
    }
    :return: {"ok": bool}
    """
    data = request.json
    username = data["username"]
    password = data["password"]

    if username not in users or users[username] != password:
        return {"ok": False}

    text = data["text"]

    messages.append({"username": username, "text": text, "time": time.time()})

    return {'ok': True}

@app.route("/auth", methods=['POST'])
def sauth_view():
    """
    Авторизовать пользователя или сообщить, что пароль неверный.
    input: {
        "username": str,
        "password": str
    }
    :return: {"ok": bool}
    """
    data = request.json
    username = data["username"]
    password = data["password"]

    if username not in users:
        users[username] = password
        return {"ok": True}
    elif users[username] != password:
        return {"ok": False}
    else:
        return {"ok": True}


app.run()