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Cloudinary is a cloud service that offers a solution to a web application's entire image management pipeline. Upload images to the cloud. Automatically perform smart image resizing, cropping and conversion without installing any complex software. Integrate Facebook or Twitter profile image extraction in a snap, in any dimension and style to match your websiteâs graphics requirements. Images are seamlessly delivered through a fast CDN, and much much more. This Java library allows to easily integrate with Cloudinary in Java applications.

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package com.cloudinary.http42;

import com.cloudinary.Cloudinary;
import com.cloudinary.ProgressCallback;
import com.cloudinary.Util;
import com.cloudinary.strategies.AbstractUploaderStrategy;
import com.cloudinary.utils.ObjectUtils;
import com.cloudinary.utils.StringUtils;
import org.apache.http.HttpHost;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.conn.ClientConnectionManager;
import org.apache.http.conn.params.ConnRoutePNames;
import org.apache.http.entity.mime.HttpMultipartMode;
import org.apache.http.entity.mime.MultipartEntity;
import org.apache.http.entity.mime.content.ByteArrayBody;
import org.apache.http.entity.mime.content.FileBody;
import org.apache.http.entity.mime.content.StringBody;
import org.apache.http.impl.client.DefaultHttpClient;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.Charset;
import java.util.Collection;
import java.util.Map;

public class UploaderStrategy extends AbstractUploaderStrategy {

    @SuppressWarnings({"rawtypes", "unchecked"})
    @Override
    public Map callApi(String action, Map params, Map options, Object file, ProgressCallback progressCallback) throws IOException {
        if (progressCallback != null){
            throw new IllegalArgumentException("Progress callback is not supported");
        }

        // initialize options if passed as null
        if (options == null) {
            options = ObjectUtils.emptyMap();
        }

        boolean returnError = ObjectUtils.asBoolean(options.get("return_error"), false);

        if (requiresSigning(action, options)) {
            uploader.signRequestParams(params, options);
        } else {
            Util.clearEmpty(params);
        }

        String apiUrl = buildUploadUrl(action, options);

        ClientConnectionManager connectionManager = (ClientConnectionManager) this.uploader.cloudinary().config.properties.get("connectionManager");
        HttpClient client = new DefaultHttpClient(connectionManager);

        // If the configuration specifies a proxy then apply it to the client
        if (uploader.cloudinary().config.proxyHost != null && uploader.cloudinary().config.proxyPort != 0) {
            HttpHost proxy = new HttpHost(uploader.cloudinary().config.proxyHost, uploader.cloudinary().config.proxyPort);
            client.getParams().setParameter(ConnRoutePNames.DEFAULT_PROXY, proxy);
        }

        HttpPost postMethod = new HttpPost(apiUrl);
        postMethod.setHeader("User-Agent", Cloudinary.USER_AGENT + " ApacheHTTPComponents/4.2");

        Map extraHeaders = (Map) options.get("extra_headers");
        if (extraHeaders != null) {
            for (Map.Entry header : extraHeaders.entrySet()) {
                postMethod.setHeader(header.getKey(), header.getValue());
            }
        }

        Charset utf8 = Charset.forName("UTF-8");

        MultipartEntity multipart = new MultipartEntity(HttpMultipartMode.BROWSER_COMPATIBLE);
        // Remove blank parameters
        for (Map.Entry param : params.entrySet()) {
            if (param.getValue() instanceof Collection) {
                for (Object value : (Collection) param.getValue()) {
                    multipart.addPart(param.getKey() + "[]", new StringBody(ObjectUtils.asString(value), utf8));
                }
            } else {
                String value = param.getValue().toString();
                if (StringUtils.isNotBlank(value)) {
                    multipart.addPart(param.getKey(), new StringBody(value, utf8));
                }
            }
        }

        if (file instanceof String && !((String) file).matches("ftp:.*|https?:.*|s3:.*|data:[^;]*;base64,([a-zA-Z0-9/+\n=]+)")) {
            File _file = new File((String) file);
            if (!_file.isFile() && !_file.canRead()) {
                throw new IOException("File not found or unreadable: " + file);
            }
            file = _file;
        }
        String filename = (String) options.get("filename");
        if (file instanceof File) {
            multipart.addPart("file", new FileBody((File) file, filename, "application/octet-stream", null));
        } else if (file instanceof String) {
            multipart.addPart("file", new StringBody((String) file, utf8));
        } else if (file instanceof byte[]) {
            if (filename == null) filename = "file";
            multipart.addPart("file", new ByteArrayBody((byte[]) file, filename));
        } else if (file == null) {
            // no-problem
        } else {
            throw new IOException("Unrecognized file parameter " + file);
        }
        postMethod.setEntity(multipart);

        HttpResponse response = client.execute(postMethod);
        int code = response.getStatusLine().getStatusCode();
        InputStream responseStream = response.getEntity().getContent();
        String responseData = StringUtils.read(responseStream);

        return processResponse(returnError, code, responseData);
    }

}