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OAuth Authorization Framework

OAuth is a commonly used standard by many application developers. It specifies a process for resource owners to authorize third parties access to their server resources without sharing their credentials. 
Clients use the access token to grant access to the protected user data. The process that the client grant the access token is known as grant type.

 1)Authorization code grant type

Figure 1
 Can use to obtain both access token and refresh tokens.The flow of authorization code grant type is as follows.When user authorize the third party app to access data, the app request for authorization . 
Then the authorization server authenticates the resource owner.The access token is sent to client application as the response. The client app request for the access token, using the authorization code. The client app get receive the access token as the respones. 

2)    Implicit grant type

Figure 2
  Client is not authenticated in implicit grant type, as in authorization code grant type authorization server authenticates the resource owner. By adding the access token, the resource owner redirects it to the client using the URI fragment. Access token get extracted and passed it back to the client.

3)    Resource owner password credential grant type

Figure 3
  This grant type is used when the secure relationship is required between the client and the resource owner. After resource owner provide the user name and password to the client, the client request for the access token. Then the authorization server authenticates the client. If the authentication process gets successful, the access token is issued by the authorization server.

4)    Client credential grant type
Figure 4
  The client can request access token by using client credentials. The authorization server authenticates the client and provides the access token to the client.

  You can see a sample project (GitHub) :-  OAuth Authorization Framework
           

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