第一步：获取 access_token

客户端凭证获取 access_token

客户端可以直接通过调用 Restfull API 根据客户端凭证获取 access_token，然后通过 access_token 继续获取认证用户信息

接口地址:

• https://cas_server_url/oauth2.0/accessToken

参考地址

https://cas_server_url/oauth2.0/accessToken?grant_type=client_credentials&client_id=client&client_secret=123456

请求方式：

• GET
• POST

请求参数:

响应状态

响应示例:

正确时返回:

{
    "access_token": "AT-3-rX4WfOiCgiF6qMNt52PfqDaQj-F4I9LK",
    "token_type": "bearer",
    "expires_in": 28800
}

错误时返回:

{
    "timestamp": 1660987198227,
    "status": 401,
    "error": "Unauthorized",
    "message": "No message available",
    "path": "/oauth2.0/accessToken"
}

响应参数:

调用示例:

JavaScript - Fetch 示例：

var myHeaders = new Headers();
myHeaders.append("Content-Type", "application/json");

var requestOptions = {
  method: 'POST',
  headers: myHeaders,
  redirect: 'follow'
};

fetch("https://cas_server_url/oauth2.0/accessToken?grant_type=client_credentials&client_id=xxx&client_secret=xxx", requestOptions)
  .then(response => response.text())
  .then(result => console.log(result))
  .catch(error => console.log('error', error));

Java - OkHttp 示例：

OkHttpClient client = new OkHttpClient().newBuilder()
  .build();
MediaType mediaType = MediaType.parse("application/json");
RequestBody body = RequestBody.create(mediaType, "");
Request request = new Request.Builder()
  .url("https://cas_server_url/oauth2.0/accessToken?grant_type=client_credentials&client_id=xxx&client_secret=xxx")
  .method("POST", body)
  .addHeader("Content-Type", "application/json")
  .build();
Response response = client.newCall(request).execute();