com.esri.geoportal.harvester.waf.WafFile.java Source code

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Here is the source code for com.esri.geoportal.harvester.waf.WafFile.java

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/*
 * Copyright 2016 Esri, Inc..
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.esri.geoportal.harvester.waf;

import com.esri.geoportal.commons.constants.MimeType;
import com.esri.geoportal.commons.constants.MimeTypeUtils;
import com.esri.geoportal.commons.http.BotsHttpClient;
import static com.esri.geoportal.commons.utils.Constants.DEFAULT_REQUEST_CONFIG;
import static com.esri.geoportal.commons.utils.HttpClientContextBuilder.createHttpClientContext;
import com.esri.geoportal.commons.utils.SimpleCredentials;
import com.esri.geoportal.harvester.api.base.SimpleDataReference;
import java.io.IOException;
import java.io.InputStream;
import java.net.URISyntaxException;
import java.net.URL;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Date;
import org.apache.commons.io.IOUtils;
import org.apache.http.Header;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpResponseException;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.protocol.HttpClientContext;

/**
 * WAF file.
 */
/*package*/ class WafFile {

    private final WafBroker broker;
    private final URL fileUrl;
    private final SimpleCredentials creds;

    /**
     * Creates instance of the WAF file.
     *
     * @param broker broker
     * @param fileUrl file URL
     * @param creds credentials
     */
    public WafFile(WafBroker broker, URL fileUrl, SimpleCredentials creds) {
        this.broker = broker;
        this.fileUrl = fileUrl;
        this.creds = creds;
    }

    /**
     * Reads content.
     * @param httpClient HTTP client
     * @param since since date
     * @return content reference
     * @throws IOException if reading content fails
     * @throws URISyntaxException if file url is an invalid URI
     */
    public SimpleDataReference readContent(BotsHttpClient httpClient, Date since)
            throws IOException, URISyntaxException {
        HttpGet method = new HttpGet(fileUrl.toExternalForm());
        method.setConfig(DEFAULT_REQUEST_CONFIG);
        HttpClientContext context = creds != null && !creds.isEmpty() ? createHttpClientContext(fileUrl, creds)
                : null;

        try (CloseableHttpResponse httpResponse = httpClient.execute(method, context);
                InputStream input = httpResponse.getEntity().getContent();) {
            if (httpResponse.getStatusLine().getStatusCode() >= 400) {
                throw new HttpResponseException(httpResponse.getStatusLine().getStatusCode(),
                        httpResponse.getStatusLine().getReasonPhrase());
            }
            Date lastModifiedDate = readLastModifiedDate(httpResponse);
            MimeType contentType = readContentType(httpResponse);
            boolean readBody = since == null || lastModifiedDate == null
                    || lastModifiedDate.getTime() >= since.getTime();
            return new SimpleDataReference(broker.getBrokerUri(), broker.getEntityDefinition().getLabel(),
                    fileUrl.toExternalForm(), lastModifiedDate, fileUrl.toURI(),
                    readBody ? IOUtils.toByteArray(input) : null, contentType);
        }
    }

    /**
     * Reads last modified date.
     * @param response HTTP response
     * @return last modified date or <code>null</code> if unavailable
     */
    private Date readLastModifiedDate(HttpResponse response) {
        try {
            Header lastModifedHeader = response.getFirstHeader("Last-Modified");
            return lastModifedHeader != null ? Date.from(ZonedDateTime
                    .from(DateTimeFormatter.RFC_1123_DATE_TIME.parse(lastModifedHeader.getValue())).toInstant())
                    : null;
        } catch (Exception ex) {
            return null;
        }
    }

    /**
     * Reads content type.
     * @param response HTTP response
     * @return content type or <code>null</code> if unable to read content type
     */
    private MimeType readContentType(HttpResponse response) {
        try {
            Header contentTypeHeader = response.getFirstHeader("Content-Type");
            MimeType contentType = null;
            if (contentTypeHeader != null) {
                contentType = MimeType.parse(contentTypeHeader.getValue());
            }
            if (contentType == null) {
                String strFileUrl = fileUrl.toExternalForm();
                int lastDotIndex = strFileUrl.lastIndexOf(".");
                String ext = lastDotIndex >= 0 ? strFileUrl.substring(lastDotIndex + 1) : "";
                contentType = MimeTypeUtils.mapExtension(ext);
            }
            return contentType;
        } catch (Exception ex) {
            return null;
        }
    }

    /**
     * Gets file URL.
     * @return file URL
     */
    public URL getFileUrl() {
        return fileUrl;
    }

    @Override
    public String toString() {
        return fileUrl.toString();
    }
}