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Full implementation of the BitPay Payment Gateway. This library implements BitPay's Cryptographically Secure RESTful API.

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/*
 * Copyright (c) 2019 BitPay.
 * All rights reserved.
 */

package com.bitpay.sdk.client;

import com.bitpay.sdk.Config;
import com.bitpay.sdk.exceptions.BitPayApiException;
import com.bitpay.sdk.exceptions.BitPayExceptionProvider;
import com.bitpay.sdk.exceptions.BitPayGenericException;
import com.bitpay.sdk.logger.LoggerProvider;
import com.bitpay.sdk.util.KeyUtils;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.nio.charset.StandardCharsets;
import java.util.List;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpDelete;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpPut;
import org.apache.http.client.utils.URLEncodedUtils;
import org.apache.http.entity.ByteArrayEntity;
import org.apache.http.message.AbstractHttpMessage;
import org.apache.http.message.BasicNameValuePair;
import org.bitcoinj.core.ECKey;

/**
 * The type Bit pay client.
 */
public class BitPayClient {

    private final HttpClient httpClient;
    private final HttpRequestFactory httpRequestFactory;
    private final String baseUrl;
    private final ECKey ecKey;
    private String platformInfo = null;

    /**
     * Instantiates a new Bit pay client.
     *
     * @param httpClient         the http client
     * @param httpRequestFactory the http request factory
     * @param baseUrl            the base url
     * @param ecKey              the ECKey
     */
    public BitPayClient(
        final HttpClient httpClient,
        final HttpRequestFactory httpRequestFactory,
        final String baseUrl,
        final ECKey ecKey
    ) {
        this.httpClient = httpClient;
        this.baseUrl = baseUrl;
        this.httpRequestFactory = httpRequestFactory;
        this.ecKey = ecKey;
    }

    /**
     * Instantiates a new Bit pay client.
     *
     * @param httpClient         the http client
     * @param httpRequestFactory the http request factory
     * @param baseUrl            the base url
     * @param ecKey              the ECKey
     * @param platformInfo       the Platform Info
     */
    public BitPayClient(
        final HttpClient httpClient,
        final HttpRequestFactory httpRequestFactory,
        final String baseUrl,
        final ECKey ecKey,
        final String platformInfo
    ) {
        this.httpClient = httpClient;
        this.baseUrl = baseUrl;
        this.httpRequestFactory = httpRequestFactory;
        this.ecKey = ecKey;
        this.platformInfo = platformInfo;
    }

    /**
     * Send GET request.
     *
     * @param uri        the uri
     * @param parameters the parameters
     * @return the http response
     * @throws BitPayGenericException BitPayGenericException class
     * @throws BitPayApiException BitPayApiException class
     */
    public HttpResponse get(
        final String uri,
        final List parameters
    ) throws BitPayApiException, BitPayGenericException {
        return get(uri, parameters, true);
    }

    /**
     * Send GET request.
     *
     * @param uri               the uri
     * @param parameters        the parameters
     * @param signatureRequired the signature required
     * @return the json http response
     * @throws BitPayGenericException BitPayGenericException
     * @throws BitPayApiException BitPayApiException
     */
    public HttpResponse get(
        final String uri,
        final List parameters,
        final boolean signatureRequired
    ) throws BitPayApiException, BitPayGenericException {
        try {
            String fullUrl = this.baseUrl + uri;
            final HttpGet httpGet = this.httpRequestFactory.createHttpGet(fullUrl);

            if (parameters != null) {
                fullUrl += "?" + URLEncodedUtils.format(parameters, "UTF-8");
                httpGet.setURI(new URI(fullUrl));
            }

            this.addDefaultHeaders(httpGet);
            if (signatureRequired) {
                this.addSignatureRequiredHeaders(httpGet, fullUrl);
            }

            LoggerProvider.getLogger().logRequest(HttpGet.METHOD_NAME, fullUrl, null);

            HttpResponse response = HttpResponseProvider.fromApacheHttpResponse(this.httpClient.execute(httpGet));

            LoggerProvider.getLogger().logResponse(HttpGet.METHOD_NAME, fullUrl, response.getBody());

            return response;
        } catch (IOException | URISyntaxException e) {
            BitPayExceptionProvider.throwApiExceptionWithMessage(e.getMessage());
            throw new BitPayApiException(e.getMessage(), null);
        }
    }

    /**
     * Send GET request.
     *
     * @param uri the uri
     * @return json http response
     * @throws BitPayApiException BitPayApiException
     * @throws BitPayGenericException BitPayGenericException
     */
    public HttpResponse get(final String uri) throws BitPayApiException, BitPayGenericException {
        return this.get(uri, null, false);
    }

    /**
     * Send DELETE request.
     *
     * @param uri        the uri
     * @param parameters the parameters
     * @return json http response
     * @throws BitPayApiException BitPayApiException
     * @throws BitPayGenericException BitPayGenericException
     */
    public HttpResponse delete(
        final String uri,
        final List parameters
    ) throws BitPayApiException, BitPayGenericException {
        try {
            String fullUrl = this.baseUrl + uri;
            final HttpDelete httpDelete = this.httpRequestFactory.createHttpDelete(fullUrl);

            if (parameters != null) {
                fullUrl += "?" + URLEncodedUtils.format(parameters, "UTF-8");
                httpDelete.setURI(new URI(fullUrl));
            }

            this.addDefaultHeaders(httpDelete);
            this.addSignatureRequiredHeaders(httpDelete, fullUrl);

            LoggerProvider.getLogger().logRequest(HttpDelete.METHOD_NAME, fullUrl, null);

            HttpResponse response = HttpResponseProvider.fromApacheHttpResponse(this.httpClient.execute(httpDelete));

            LoggerProvider.getLogger().logResponse(HttpDelete.METHOD_NAME, fullUrl, response.getBody());

            return response;
        } catch (IOException | URISyntaxException e) {
            BitPayExceptionProvider.throwApiExceptionWithMessage(e.getMessage());
            throw new BitPayApiException(e.getMessage(), null);
        }
    }

    /**
     * Send POST request.
     *
     * @param uri  the uri
     * @param json the json
     * @return the json http response
     * @throws BitPayApiException BitPayApiException
     * @throws BitPayGenericException BitPayGenericException
     */
    public HttpResponse post(
        final String uri,
        final String json
    ) throws BitPayApiException, BitPayGenericException {
        return this.post(uri, json, false);
    }

    /**
     * Send POST request.
     *
     * @param uri               the uri
     * @param json              the json
     * @param signatureRequired the signature required
     * @return json response
     * @throws BitPayApiException BitPayApiException
     * @throws BitPayGenericException BitPayGenericException
     */
    public HttpResponse post(
        final String uri,
        final String json,
        final boolean signatureRequired
    ) throws BitPayApiException, BitPayGenericException {
        try {
            final String endpoint = this.baseUrl + uri;
            final HttpPost httpPost = this.httpRequestFactory.createHttpPost(endpoint);
            httpPost.setEntity(new ByteArrayEntity(json.getBytes(StandardCharsets.UTF_8)));

            this.addDefaultHeaders(httpPost);
            httpPost.addHeader("Content-Type", "application/json");
            if (signatureRequired) {
                this.addSignatureRequiredHeaders(httpPost, endpoint + json);
            }

            LoggerProvider.getLogger().logRequest(HttpPost.METHOD_NAME, endpoint, httpPost.toString());

            HttpResponse response = HttpResponseProvider.fromApacheHttpResponse(this.httpClient.execute(httpPost));

            LoggerProvider.getLogger().logResponse(HttpGet.METHOD_NAME, endpoint, response.getBody());

            return response;
        } catch (IOException e) {
            BitPayExceptionProvider.throwApiExceptionWithMessage(e.getMessage());
            throw new BitPayApiException(e.getMessage(), null);
        }
    }

    /**
     * Send PUT request.
     *
     * @param uri  the uri
     * @param json the json
     * @return json response
     * @throws BitPayApiException BitPayApiException
     * @throws BitPayGenericException BitPayGenericException
     */
    public HttpResponse update(
        final String uri,
        final String json
    ) throws BitPayApiException, BitPayGenericException {
        String jsonResponse = null;

        try {
            final String endpoint = this.baseUrl + uri;
            final HttpPut httpPut = this.httpRequestFactory.createHttpPut(endpoint);

            httpPut.setEntity(new ByteArrayEntity(json.getBytes(StandardCharsets.UTF_8)));

            this.addDefaultHeaders(httpPut);
            httpPut.addHeader("Content-Type", "application/json");
            this.addSignatureRequiredHeaders(httpPut, endpoint + json);

            LoggerProvider.getLogger().logRequest(HttpPut.METHOD_NAME, endpoint, httpPut.toString());

            HttpResponse response = HttpResponseProvider.fromApacheHttpResponse(this.httpClient.execute(httpPut));

            LoggerProvider.getLogger().logResponse(HttpPut.METHOD_NAME, endpoint, response.getBody());

            return response;
        } catch (IOException e) {
            BitPayExceptionProvider.throwApiExceptionWithMessage(e.getMessage());
            throw new BitPayApiException(e.getMessage(), null);
        }
    }

    private void addDefaultHeaders(AbstractHttpMessage httpMessage) {
        httpMessage.addHeader("x-accept-version", Config.BITPAY_API_VERSION);
        httpMessage.addHeader("x-bitpay-api-frame", Config.BITPAY_API_FRAME);
        httpMessage.addHeader("x-bitpay-api-frame-version", Config.BITPAY_API_FRAME_VERSION);
        httpMessage.addHeader("X-BitPay-Plugin-Info", Config.BITPAY_PLUGIN_INFO);
        if (this.platformInfo != null && !this.platformInfo.isEmpty()) {
            httpMessage.addHeader("x-bitPay-platform-info", this.platformInfo);
        }
    }

    private void addSignatureRequiredHeaders(AbstractHttpMessage httpMessage, String uri)
        throws BitPayGenericException {
        httpMessage.addHeader("x-signature", KeyUtils.sign(this.ecKey, uri));
        httpMessage.addHeader("x-identity", KeyUtils.bytesToHex(this.ecKey.getPubKey()));
    }
}




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