identityserver4 用户从数据库or从用户中心接口取数据，并且授权验证
主要参考：
https://www.cnblogs.com/FireworksEasyCool/p/10181681.html
https://stackoverflow.com/questions/35304038/identityserver4-register-userservice-and-get-users-from-database-in-asp-net-core
除用户之外的数据存入db的方法：
https://www.cnblogs.com/liujiabing/p/11599146.html#!comments
IdentityServer4：发布环境的数字签名证书
https://www.cnblogs.com/liujiabing/p/11611926.html
福禄的ids4实践
https://mp.weixin.qq.com/s/QOkEWNvqAhGwmh-AQL-9GA
ids4混合模式 hybird
https://www.cnblogs.com/FireworksEasyCool/p/10181525.html
IdentityServer4 中文文档与实战 网址集合
https://www.cnblogs.com/stulzq/p/8119928.html
ids4的sso原理filter跟踪
https://www.cnblogs.com/xiaxiaolu/p/11204548.html
https://www.cnblogs.com/linianhui/p/oidc-in-action-sso.html
https://blog.csdn.net/dieya9314/article/details/101748485
IdentityServer4客户端如何获取自定义声明
https://www.cnblogs.com/CreateMyself/p/9399118.html
前端oidc-client.js
https://www.cnblogs.com/ddrsql/p/8004888.html
一篇英文文档
https://betterprogramming.pub/the-complete-guide-to-oauth-2-0-and-openid-connect-protocols-35ebc1cbc11a