1. 首先需要使用Keycloak Admin API获取access token和refresh token。
2. 在本地设置一个路由，用于在每次请求时验证refresh token。
3. 在路由的处理程序中，使用Keycloak提供的jwt.decode()方法对refresh token进行解码并验证。
4. 如果token未过期，则通过使用Keycloak提供的Token Endpoint来获取新的access token和refresh token。 代码示例：

import jwt
import requests

# 获取access token和refresh token
def get_tokens():
    url = "https://your-keycloak-url/auth/realms/your-realm/protocol/openid-connect/token"
    data = {
        "grant_type": "password",
        "client_id": "your-client-id",
        "username": "your-username",
        "password": "your-password"
    }
    response = requests.post(url, data=data)
    tokens = response.json()
    access_token = tokens["access_token"]
    refresh_token = tokens["refresh_token"]
    return access_token, refresh_token

# 验证refresh token是否有效
def verify_refresh_token(refresh_token):
    public_key_url = "https://your-keycloak-url/auth/realms/your-realm/protocol/openid-connect/certs"
    response = requests.get(public_key_url)
    public_key = response.json()["keys"][0]["x5c"][0]
    try:
        decoded_token = jwt.decode(refresh_token, public_key, algorithms=["RS256"], audience="your-client-id")
        return decoded_token.get("exp") > time.time()
    except:
        return False

# 获取新的access token和refresh token
def refresh_tokens(refresh_token):
    url = "https://your-keycloak-url/auth/realms/your-realm/protocol/openid-connect/token"
    data = {
        "grant_type": "refresh_token",
        "client_id": "your-client-id",
        "refresh_token": refresh_token
    }
    response = requests.post(url, data=data)
    tokens = response.json()
    access_token = tokens["access_token"]
    refresh_token = tokens["refresh_token"]
    return access_token, refresh_token

# 路由处理程序
def refresh_token_handler():