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Adyen API Client Library for Java
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/*
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 *
 * Adyen Java API Library
 *
 * Copyright (c) 2017 Adyen B.V.
 * This file is open source and available under the MIT license.
 * See the LICENSE file for more info.
 */
package com.adyen.service;

import com.adyen.Client;
import com.adyen.Config;
import com.adyen.Service;
import com.adyen.httpclient.ClientInterface;
import com.adyen.httpclient.HTTPClientException;
import com.adyen.model.hpp.DirectoryLookupRequest;
import com.adyen.model.hpp.DirectoryLookupResult;
import com.adyen.model.hpp.PaymentMethod;
import com.adyen.util.HMACValidator;
import com.google.gson.JsonSyntaxException;
import com.google.gson.reflect.TypeToken;

import java.io.IOException;
import java.security.SignatureException;
import java.util.List;
import java.util.Map;
import java.util.SortedMap;
import java.util.TreeMap;

import static com.adyen.constants.HPPConstants.Fields.COUNTRY_CODE;
import static com.adyen.constants.HPPConstants.Fields.CURRENCY_CODE;
import static com.adyen.constants.HPPConstants.Fields.MERCHANT_ACCOUNT;
import static com.adyen.constants.HPPConstants.Fields.MERCHANT_REFERENCE;
import static com.adyen.constants.HPPConstants.Fields.MERCHANT_SIG;
import static com.adyen.constants.HPPConstants.Fields.PAYMENT_AMOUNT;
import static com.adyen.constants.HPPConstants.Fields.SESSION_VALIDITY;
import static com.adyen.constants.HPPConstants.Fields.SKIN_CODE;
import static com.adyen.constants.HPPConstants.Response.SHOPPER_LOCALE;

public class HostedPaymentPages extends Service {
    public HostedPaymentPages(Client client) {
        super(client);
    }

    public String directoryLookup(Map postParameters) throws HTTPClientException, IOException {
        String endpoint = getClient().getConfig().getHppEndpoint() + "/directory.shtml";
        ClientInterface httpClient = getClient().getHttpClient();
        Config config = getClient().getConfig();

        return httpClient.post(endpoint, postParameters, config);
    }

    public SortedMap getPostParametersFromDLRequest(DirectoryLookupRequest request) throws SignatureException {
        Config config = getClient().getConfig();

        // Set HTTP Post variables
        SortedMap postParameters = new TreeMap<>();
        postParameters.put(CURRENCY_CODE, request.getCurrencyCode());

        if (request.getMerchantAccount() != null) {
            postParameters.put(MERCHANT_ACCOUNT, request.getMerchantAccount());
        } else {
            postParameters.put(MERCHANT_ACCOUNT, config.getMerchantAccount());
        }

        postParameters.put(PAYMENT_AMOUNT, request.getPaymentAmount());

        if (request.getSkinCode() != null) {
            postParameters.put(SKIN_CODE, request.getSkinCode());
        } else {
            postParameters.put(SKIN_CODE, config.getSkinCode());
        }

        postParameters.put(MERCHANT_REFERENCE, request.getMerchantReference());
        postParameters.put(SESSION_VALIDITY, request.getSessionValidity());
        postParameters.put(COUNTRY_CODE, request.getCountryCode());

        if (request.getShopperLocale() != null) {
            postParameters.put(SHOPPER_LOCALE, request.getShopperLocale());
        }

        HMACValidator hmacValidator = new HMACValidator();

        String dataToSign = hmacValidator.getDataToSign(postParameters);

        String hmacKey;
        if (request.getHmacKey() != null) {
            hmacKey = request.getHmacKey();
        } else {
            hmacKey = config.getHmacKey();
        }

        String merchantSig = hmacValidator.calculateHMAC(dataToSign, hmacKey);
        postParameters.put(MERCHANT_SIG, merchantSig);

        return postParameters;
    }

    public List getPaymentMethods(DirectoryLookupRequest request) throws SignatureException, IOException, HTTPClientException {
        SortedMap postParameters = getPostParametersFromDLRequest(request);

        String jsonResult = directoryLookup(postParameters);

        try {
            DirectoryLookupResult directoryLookupResult = GSON.fromJson(jsonResult, new TypeToken() {
            }.getType());

            return directoryLookupResult.getPaymentMethods();
        } catch (JsonSyntaxException e) {
            throw new HTTPClientException(200, "Invalid response or invalid skin code/HMAC key", null, jsonResult);
        }
    }
}