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package com.github.scribejava.apis;

import com.github.scribejava.apis.vk.VKJsonTokenExtractor;
import com.github.scribejava.core.builder.api.DefaultApi20;
import com.github.scribejava.core.extractors.TokenExtractor;
import com.github.scribejava.core.model.OAuth2AccessToken;
import com.github.scribejava.core.model.Verb;
import com.github.scribejava.core.oauth2.bearersignature.BearerSignature;
import com.github.scribejava.core.oauth2.bearersignature.BearerSignatureURIQueryParameter;
import com.github.scribejava.core.oauth2.clientauthentication.ClientAuthentication;
import com.github.scribejava.core.oauth2.clientauthentication.RequestBodyAuthenticationScheme;

public class VkontakteApi extends DefaultApi20 {

    public static final String VERSION = "5.92";

    protected VkontakteApi() {
    }

    private static class InstanceHolder {

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

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

    @Override
    public Verb getAccessTokenVerb() {
        return Verb.GET;
    }

    @Override
    public String getAccessTokenEndpoint() {
        return "https://oauth.vk.com/access_token";
    }

    @Override
    protected String getAuthorizationBaseUrl() {
        return "https://oauth.vk.com/authorize?v=" + VERSION;
    }

    @Override
    public BearerSignature getBearerSignature() {
        return BearerSignatureURIQueryParameter.instance();
    }

    @Override
    public ClientAuthentication getClientAuthentication() {
        return RequestBodyAuthenticationScheme.instance();
    }

    @Override
    public TokenExtractor getAccessTokenExtractor() {
        return VKJsonTokenExtractor.instance();
    }
}