backend/buisnesslogic/src/main/java/com/plannaplan/api/UsosOauth1Service.java

package com.plannaplan.api;

import com.github.scribejava.core.builder.api.DefaultApi10a;

public class UsosOauth1Service extends DefaultApi10a {

    private static final String AUTHORIZE_URL = "https://usosapidemo.amu.edu.pl/services/oauth/authorize";
    private static final String REQUEST_TOKEN_URL = "https://usosapidemo.amu.edu.pl/services/oauth/request_token";

    private final String scopesAsString;

    protected UsosOauth1Service() {
        scopesAsString = null;
    }

    protected UsosOauth1Service(String... scopes) {
        final StringBuilder builder = new StringBuilder();
        for (String scope : scopes) {
            builder.append('+').append(scope);
        }
        scopesAsString = "?scope=" + builder.substring(1);
    }

    private static class InstanceHolder {

        private static final UsosOauth1Service INSTANCE = new UsosOauth1Service();
    }

    public static UsosOauth1Service instance() {
        return InstanceHolder.INSTANCE;
    }

    public static UsosOauth1Service instance(String... scopes) {
        return scopes == null || scopes.length == 0 ? instance() : new UsosOauth1Service(scopes);
    }

    @Override
    public String getRequestTokenEndpoint() {
        return scopesAsString == null ? REQUEST_TOKEN_URL : REQUEST_TOKEN_URL + scopesAsString;
    }

    @Override
    public String getAccessTokenEndpoint() {
        return "https://usosapidemo.amu.edu.pl/services/oauth/access_token";
    }

    @Override
    protected String getAuthorizationBaseUrl() {
        return AUTHORIZE_URL;
    }

}