The OAuth Mediator supports 2 forms of OAuth. It bypasses the RESTful requests and authenticates users against WSO2 Identity Server.
When a client tries to invoke a RESTful service, it may be required to verify the credentials of the client. This can be achieved by registering an OAuth application in the WSO2 Identity Server. When the client sends a REST call with the Authorization header to the ESB, the OAuth mediator validates it with the Identity server and proceeds.
See 2-legged OAuth for Securing a RESTful Service for detailed instructions to carry out this process.
If you are using OAuth 1 a, you will get the
org.apache.synapse.SynapseException: Unable to find SCOPE value in Synapse Message Context error when the
SCOPE property is not set in the synapse message context. To avoid this error, add a property with the name
scope and a value in the synapse message context as shown in the Example section.
The parameters available to configure the OAuth mediator are as follows.
|OAuth Server||The server URL of the WSO2 Identity Server.|
|Username||The user name to be used to log into the WSO2 Identity Server.|
|Password||The password used to log into the WSO2 Identity Server.|
In the following OAuth mediator configuration accesses a remote service via the
https://localhost:9443/service URL. The user accessing this service is authenticated via the OAuth application registered in the WSO2 Identity Server and accessed via the
http://ws.apache.org/ns/synapse URL. The username used to log into the WSO2 Identity Server is
foo and the password is
bar. Both the user name and the password should be registered in the Identity Server. The Property mediator adds a property named
scope to the synapse message context. The value of this property will be used by the OAuth mediator to send the OAuth request.
The following example is applicable for OAuth 2.0 as well.