python对接cas统一认证系统实现登录

问题：如何使用python对接cas统一认证系统，实现用户登录？

解决：使用模块python-cas

方法：

from cas import CASClient

cas_client = CASClient(
    version=3,
    service_url='http://xx.com/login?next=%2Fprofile',
    server_url='http://sso.xx.xx.cn/cas/'
)


@router.get("/", name="测试cas")
async def index():
    return RedirectResponse('/login')

@router.get("/profile")
async def profile():
    username = redis_conn.get('session')  # 这里使用的是redis存储用户session
    if username:
        html = 'Logged in as %s. <a href="/logout">Logout</a>' % username
    else:
        html = 'Login required. <a href="/login">Login</a>'
    return HTMLResponse(html)


@router.get("/login")
async def login(next: Union[str, None]=None, ticket: Union[str, None]=None):
    username = redis_conn.get('session')
    if username:
        # Already logged in
        return RedirectResponse('/profile')

    if not ticket:
        # No ticket, the request come from end user, send to CAS login
        cas_login_url = cas_client.get_login_url()
        print('CAS login URL: %s' % cas_login_url)
        # return None
        return RedirectResponse(cas_login_url)

    # There is a ticket, the request come from CAS as callback.
    # need call `verify_ticket()` to validate ticket and get user profile.
    print('ticket: %s' % ticket)
    print('next: %s' %  next)

    user, attributes, pgtiou = cas_client.verify_ticket(ticket)

    print('CAS verify ticket response: user: %s, attributes: %s, pgtiou: %s' % (user, attributes, pgtiou))

    if not user:
        html = 'Failed to verify ticket. <a href="/login">Login</a>'
        return HTMLResponse(html)
    else:  # Login successfully, redirect according `next` query parameter.
        redis_conn.set('session', user)
        return RedirectResponse(next)


@router.get("/logout")
async def logout():
    service_url = 'http://xx.com/logout_callback'
    cas_logout_url = cas_client.get_logout_url(service_url)
    print('CAS logout URL: %s' % cas_logout_url)
    return RedirectResponse(cas_logout_url)


@router.get("/logout_callback")
async def logout_callback():
    redis_conn.delete('session')
    html = 'Logged out from CAS. <a href="/login">Login</a>'
    return HTMLResponse(html)

参考：

https://djangocas.dev/blog/python-cas-flask-example/