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WSO2 Identity Server - Extension Points - Part 2 - OAuth

OAuth2 is widely used in the enterprise today for authorization aspects of APIs. This is the second post on the extension points available in WSO2 Identity Server after WSO2 Identity Server - Extension Points - Part 1 - SAML

All the implementation using following extension point needs to be configured at <IS_HOME>/repository/conf/identity/identity.xml file under the element OAuth.
1. Custom OAuth grant handlerUsage: When we need to support an OAuth flow that is different from standard grant types. Validates the grant, scopes, and access delegation.
Sample:https://docs.wso2.com/display/IS510/Writing+a+Custom+OAuth+2.0+Grant+Type
Interface:org.wso2.carbon.identity.oauth2.token.handlers.grant.AuthorizationGrantHandler
2. Client Auth Handler
Usage: When the client credential authentication needs to be customized. By default we validate the client id and secret.
Interface: org.wso2.carbon.identity.oauth2.token.handlers.clientauth.ClientAuthenticationHandler
3. OAuthCallbackHandlerAn ex…