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

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Here is the source code for com.esri.geoportal.harvester.waf.HtmlUrlScrapper.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.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 java.io.IOException;
import java.io.InputStream;
import java.net.URISyntaxException;
import java.net.URL;
import java.util.List;
import org.apache.commons.io.IOUtils;
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;

/**
 * HTML URL scrapper.
 */
/*package*/ class HtmlUrlScrapper {
    private final BotsHttpClient httpClient;
    private final SimpleCredentials creds;

    /**
     * Creates instance of the scrapper
     * @param httpClient HTTP client
     * @param creds credentials
     */
    public HtmlUrlScrapper(BotsHttpClient httpClient, SimpleCredentials creds) {
        this.httpClient = httpClient;
        this.creds = creds;
    }

    /**
     * Scrap HTML page for URL's
     * @param root root of the page
     * @return list of found URL's
     * @throws IOException if error reading data
     * @throws URISyntaxException if invalid URL
     */
    public List<URL> scrap(URL root) throws IOException, URISyntaxException {
        ContentAnalyzer analyzer = new ContentAnalyzer(root);
        HttpGet method = new HttpGet(root.toExternalForm());
        method.setConfig(DEFAULT_REQUEST_CONFIG);
        HttpClientContext context = creds != null && !creds.isEmpty() ? createHttpClientContext(root, 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());
            }
            String content = IOUtils.toString(input, "UTF-8");
            return analyzer.analyze(content);
        }
    }
}