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package eu.dnetlib.data.utils;
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import java.net.URI;
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import java.net.URISyntaxException;
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import org.apache.commons.lang3.StringUtils;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import org.springframework.http.HttpEntity;
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import org.springframework.http.HttpHeaders;
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import org.springframework.http.HttpMethod;
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public class HttpFetcher {
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private static final Log log = LogFactory.getLog(HttpFetcher.class);
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private static final int INTERVAL_MILLIS = 20000;
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public static final int MAX_NUMBER_OF_ATTEMPTS = 10;
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public static String fetch(final String url, final String accessToken) throws URISyntaxException {
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return fetch(new URI(url), 1, accessToken);
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}
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public static String fetch(final URI url, final String accessToken) {
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return fetch(url, 1, accessToken);
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}
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public static String fetch(final URI url, final int attempts, final String accessToken) {
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if (attempts > MAX_NUMBER_OF_ATTEMPTS) {
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log.error("Max number of attempts reached, downloading url: " + url);
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return "";
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}
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try {
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log.debug("Downloading URL: " + url + " - try: " + attempts);
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final HttpHeaders headers = new HttpHeaders();
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if (StringUtils.isNotBlank(accessToken)) {
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log.debug("Perform call using access token: " + accessToken);
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headers.set("Authorization", "Bearer " + accessToken);
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}
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return RestTemplateFactory.newInstance()
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.exchange(url, HttpMethod.GET, new HttpEntity<>(null, headers), String.class)
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.getBody();
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} catch (final Throwable e) {
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try {
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log.error("Error downloading url: " + url + " - try: " + attempts + " - " + e.getMessage());
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Thread.sleep(INTERVAL_MILLIS);
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return fetch(url, attempts + 1, accessToken);
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} catch (final InterruptedException e1) {
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log.error(e);
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return "";
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}
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}
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}
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}
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