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4.1.1. 授权请求(4.1.1. Authorization Request)

4.1.1. 授权请求

客户端通过按附录B使用“application/x-www-form-urlencoded”格式向授权端点URI的查询部分添加下列参数构造请求URI：

  • response_type
    必需的。值必须被设置为“code”。
  • client_id
    必需的。如2.2节所述的客户端标识。
  • redirect_uri
    可选的。如3.1.2节所述。
  • scope
    可选的。如3.3节所述的访问请求的范围。
  • state
    推荐的。客户度用于维护请求和回调之间的状态的不透明的值。当重定向用户代理回到客户端时，授权服务器包含此值。该参数应该用于防止如10.12所述的跨站点请求伪造。

客户端使用HTTP重定向响应向构造的URI定向资源所有者，或者通过经由用户代理至该URI的其他可用方法。 例如，客户端使用TLS定向用户代理发起下述HTTP请求（额外的换行仅用于显示目的）：

GET /authorize?response_type=code&client_id=s6BhdRkqt3&state=xyz&redirect_uri=https%3A%2F%2Fclient%2Eexample%2Ecom%2Fcb HTTP/1.1
Host: server.example.com

授权服务器验证该请求，确保所有需要的参数已提交且有效。如果请求是有效的，授权服务器对资源所有者进行身份验证并获得授权决定（通过询问资源所有者或通过经由其他方式确定批准）。

当确定决定后，授权服务器使用HTTP重定向响应向提供的客户端重定向URI定向用户代理，或者通过经由用户代理至该URI的其他可行方法。

 

4.1.1. Authorization Request



   The client constructs the request URI by adding the following
   parameters to the query component of the authorization endpoint URI
   using the "application/x-www-form-urlencoded" format, per Appendix B:

   response_type
         REQUIRED.  Value MUST be set to "code".

   client_id
         REQUIRED.  The client identifier as described in Section 2.2.

   redirect_uri
         OPTIONAL.  As described in Section 3.1.2.





Hardt                        Standards Track                   [Page 25]
 
RFC 6749                        OAuth 2.0                   October 2012


   scope
         OPTIONAL.  The scope of the access request as described by
         Section 3.3.

   state
         RECOMMENDED.  An opaque value used by the client to maintain
         state between the request and callback.  The authorization
         server includes this value when redirecting the user-agent back
         to the client.  The parameter SHOULD be used for preventing
         cross-site request forgery as described in Section 10.12.

   The client directs the resource owner to the constructed URI using an
   HTTP redirection response, or by other means available to it via the
   user-agent.

   For example, the client directs the user-agent to make the following
   HTTP request using TLS (with extra line breaks for display purposes
   only):

    GET /authorize?response_type=code&client_id=s6BhdRkqt3&state=xyz
        &redirect_uri=https%3A%2F%2Fclient%2Eexample%2Ecom%2Fcb HTTP/1.1
    Host: server.example.com

   The authorization server validates the request to ensure that all
   required parameters are present and valid.  If the request is valid,
   the authorization server authenticates the resource owner and obtains
   an authorization decision (by asking the resource owner or by
   establishing approval via other means).

   When a decision is established, the authorization server directs the
   user-agent to the provided client redirection URI using an HTTP
   redirection response, or by other means available to it via the
   user-agent.
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