Library for OAuth Provider (Java) [closed]

Answer 1

You can use the Jersey OAuth Signature Library.

Simple OAuth authentication for a servlet or filter may be set up using a Container Filter, which filters the request before the request is matched and dispatched to a root resource class. The Container Filter is registered using initialization parameters which point to a user defined class, such as the following:

public class OAuthAuthenticationFilter implements ContainerRequestFilter {
    @Override
    public ContainerRequest filter(ContainerRequest containerRequest) {
        // Read the OAuth parameters from the request
        OAuthServerRequest request = new OAuthServerRequest(containerRequest);
        OAuthParameters params = new OAuthParameters();
        params.readRequest(request);

        // Set the secret(s), against which we will verify the request
        OAuthSecrets secrets = new OAuthSecrets();
        // ... secret setting code ...

        // Check that the timestamp has not expired
        String timestampStr = params.getTimestamp();
        // ... timestamp checking code ...

        // Verify the signature
        try {
            if(!OAuthSignature.verify(request, params, secrets)) {
                throw new WebApplicationException(401);
            }
        } catch (OAuthSignatureException e) {
            throw new WebApplicationException(e, 401);
        }

        // Return the request
        return containerRequest;
    }
}