java-tutorials/spring-5-security-oauth/src/main/java/com/baeldung/oauth2/LinkedinTokenResponseConverter.java

package com.baeldung.oauth2;

import java.util.Map;

import org.springframework.core.convert.converter.Converter;
import org.springframework.security.oauth2.core.OAuth2AccessToken;
import org.springframework.security.oauth2.core.endpoint.OAuth2AccessTokenResponse;
import org.springframework.security.oauth2.core.endpoint.OAuth2ParameterNames;

public class LinkedinTokenResponseConverter implements Converter<Map<String, String>, OAuth2AccessTokenResponse> {

    @Override
    public OAuth2AccessTokenResponse convert(Map<String, String> tokenResponseParameters) {
        String accessToken = tokenResponseParameters.get(OAuth2ParameterNames.ACCESS_TOKEN);
        long expiresIn = Long.valueOf(tokenResponseParameters.get(OAuth2ParameterNames.EXPIRES_IN));
        
        OAuth2AccessToken.TokenType accessTokenType = OAuth2AccessToken.TokenType.BEARER;

        return OAuth2AccessTokenResponse.withToken(accessToken)
            .tokenType(accessTokenType)
            .expiresIn(expiresIn)
            .build();
    }
}