Rest collector plugin on hadoop supports a new param to pass request headers

dhp-workflows/dhp-aggregation/src/main/java/eu/dnetlib/dhp/collection/plugin/rest/RestCollectorPlugin.java

@@ -1,12 +1,14 @@
 
 package eu.dnetlib.dhp.collection.plugin.rest;
 
+import java.util.Map;
 import java.util.Optional;
 import java.util.Spliterator;
 import java.util.Spliterators;
 import java.util.stream.Stream;
 import java.util.stream.StreamSupport;
 
+import com.google.gson.Gson;
 import org.apache.commons.lang3.StringUtils;
 
 import eu.dnetlib.dhp.collection.ApiDescriptor;
@@ -47,6 +49,9 @@ public class RestCollectorPlugin implements CollectorPlugin {
 		final String entityXpath = api.getParams().get("entityXpath");
 		final String authMethod = api.getParams().get("authMethod");
 		final String authToken = api.getParams().get("authToken");
+		final String requestHeaderMap = api.getParams().get("requestHeaderMap");
+		Gson gson = new Gson();
+		Map requestHeaders = gson.fromJson(requestHeaderMap, Map.class);
 		final String resultSizeValue = Optional
 			.ofNullable(api.getParams().get("resultSizeValue"))
 			.filter(StringUtils::isNotBlank)
@@ -64,9 +69,6 @@ public class RestCollectorPlugin implements CollectorPlugin {
 		if (StringUtils.isBlank(resultFormatValue)) {
 			throw new CollectorException("Param 'resultFormatValue' is null or empty");
 		}
-		if (StringUtils.isBlank(queryParams)) {
-			throw new CollectorException("Param 'queryParams' is null or empty");
-		}
 		if (StringUtils.isBlank(entityXpath)) {
 			throw new CollectorException("Param 'entityXpath' is null or empty");
 		}
@@ -92,7 +94,8 @@ public class RestCollectorPlugin implements CollectorPlugin {
 			entityXpath,
 			authMethod,
 			authToken,
-			resultOutputFormat);
+			resultOutputFormat,
+				requestHeaders);
 
 		return StreamSupport
 			.stream(

dhp-workflows/dhp-aggregation/src/main/java/eu/dnetlib/dhp/collection/plugin/rest/RestIterator.java

@@ -9,6 +9,7 @@ import java.net.URL;
 import java.net.URLEncoder;
 import java.nio.charset.StandardCharsets;
 import java.util.Iterator;
+import java.util.Map;
 import java.util.Queue;
 import java.util.concurrent.PriorityBlockingQueue;
 
@@ -24,6 +25,7 @@ import javax.xml.xpath.XPathExpression;
 import javax.xml.xpath.XPathExpressionException;
 import javax.xml.xpath.XPathFactory;
 
+import com.google.common.collect.Maps;
 import org.apache.commons.io.IOUtils;
 import org.apache.commons.lang3.StringUtils;
 import org.apache.http.HttpHeaders;
@@ -49,13 +51,14 @@ import eu.dnetlib.dhp.common.collection.HttpClientParams;
  */
 public class RestIterator implements Iterator<String> {
 
+
 	private static final Logger log = LoggerFactory.getLogger(RestIterator.class);
 	public static final String UTF_8 = "UTF-8";
 	private static final int MAX_ATTEMPTS = 5;
 
 	private final HttpClientParams clientParams;
 
-	private final String BASIC = "basic";
+	private final String AUTHBASIC = "basic";
 
 	private final String baseUrl;
 	private final String resumptionType;
@@ -89,6 +92,12 @@ public class RestIterator implements Iterator<String> {
 	 */
 	private final String resultOutputFormat;
 
+	/*
+    Can be used to set additional request headers, like for content negotiation
+     */
+	private Map<String, String> requestHeaders;
+
+
 	/**
 	 * RestIterator class compatible to version 1.3.33
 	 */
@@ -107,7 +116,8 @@ public class RestIterator implements Iterator<String> {
 		final String entityXpath,
 		final String authMethod,
 		final String authToken,
-		final String resultOutputFormat) {
+		final String resultOutputFormat,
+		final Map<String, String> requestHeaders) {
 
 		this.clientParams = clientParams;
 		this.baseUrl = baseUrl;
@@ -119,6 +129,7 @@ public class RestIterator implements Iterator<String> {
 		this.authMethod = authMethod;
 		this.authToken = authToken;
 		this.resultOutputFormat = resultOutputFormat;
+		this.requestHeaders = requestHeaders != null ? requestHeaders : Maps.newHashMap();
 
 		this.queryFormat = StringUtils.isNotBlank(resultFormatParam) ? "&" + resultFormatParam + "=" + resultFormatValue
 			: "";
@@ -231,25 +242,20 @@ public class RestIterator implements Iterator<String> {
 
 				final URL qUrl = new URL(query);
 				log.debug("authMethod: {}", this.authMethod);
-				if ("bearer".equalsIgnoreCase(this.authMethod)) {
+				if (this.authMethod == "bearer") {
-					log.trace("authMethod before inputStream: {}", resultXml);
+					log.trace("RestIterator.downloadPage():: authMethod before inputStream: " + resultXml);
-					final HttpURLConnection conn = (HttpURLConnection) qUrl.openConnection();
+					requestHeaders.put("Authorization", "Bearer " + authToken);
-					conn.setRequestProperty(HttpHeaders.AUTHORIZATION, "Bearer " + this.authToken);
+					//requestHeaders.put("Content-Type", "application/json");
-					conn.setRequestProperty(HttpHeaders.CONTENT_TYPE, ContentType.APPLICATION_JSON.getMimeType());
+				} else if (AUTHBASIC.equalsIgnoreCase(this.authMethod)) {
-					conn.setRequestMethod("GET");
+					log.trace("RestIterator.downloadPage():: authMethod before inputStream: " + resultXml);
-					theHttpInputStream = conn.getInputStream();
+					requestHeaders.put("Authorization", "Basic " + authToken);
-				} else if (this.BASIC.equalsIgnoreCase(this.authMethod)) {
+					//requestHeaders.put("accept", "application/xml");
-					log.trace("authMethod before inputStream: {}", resultXml);
-					final HttpURLConnection conn = (HttpURLConnection) qUrl.openConnection();
-					conn.setRequestProperty(HttpHeaders.AUTHORIZATION, "Basic " + this.authToken);
-					conn.setRequestProperty(HttpHeaders.ACCEPT, ContentType.APPLICATION_XML.getMimeType());
-					conn.setRequestMethod("GET");
-					theHttpInputStream = conn.getInputStream();
-				} else {
-					theHttpInputStream = qUrl.openStream();
 				}
+				HttpURLConnection conn = (HttpURLConnection) qUrl.openConnection();
+				conn.setRequestMethod("GET");
+				this.setRequestHeader(conn);
+				resultStream = conn.getInputStream();
 
-				this.resultStream = theHttpInputStream;
 				if ("json".equals(this.resultOutputFormat)) {
 					resultJson = IOUtils.toString(this.resultStream, StandardCharsets.UTF_8);
 					resultXml = JsonUtils.convertToXML(resultJson);
@@ -380,7 +386,7 @@ public class RestIterator implements Iterator<String> {
 			try {
 				if (this.resultTotal == -1) {
 					this.resultTotal = Integer.parseInt(this.xprResultTotalPath.evaluate(resultNode));
-					if ("page".equalsIgnoreCase(this.resumptionType) && !this.BASIC.equalsIgnoreCase(this.authMethod)) {
+					if ("page".equalsIgnoreCase(this.resumptionType) && !this.AUTHBASIC.equalsIgnoreCase(this.authMethod)) {
 						this.resultTotal += 1;
 					} // to correct the upper bound
 					log.info("resultTotal was -1 is now: " + this.resultTotal);
@@ -433,6 +439,22 @@ public class RestIterator implements Iterator<String> {
 		}
 	}
 
+	/**
+	 * setRequestHeader
+	 *
+	 * setRequestProperty: Sets the general request property. If a property with the key already exists, overwrite its value with the new value.
+	 * @param conn
+	 */
+	private void setRequestHeader(HttpURLConnection conn) {
+		if (requestHeaders != null) {
+			for (String key : requestHeaders.keySet()) {
+				conn.setRequestProperty(key, requestHeaders.get(key));
+			}
+			log.debug("Set Request Header with: " + requestHeaders);
+		}
+
+	}
+
 	public String getResultFormatValue() {
 		return this.resultFormatValue;
 	}

dhp-workflows/dhp-aggregation/src/test/java/eu/dnetlib/dhp/collection/plugin/rest/RestCollectorPluginTest.java

@@ -4,10 +4,16 @@
 
 package eu.dnetlib.dhp.collection.plugin.rest;
 
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.HttpURLConnection;
+import java.net.MalformedURLException;
+import java.net.URL;
 import java.util.HashMap;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.stream.Stream;
 
+import com.google.gson.Gson;
 import org.junit.jupiter.api.*;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -25,18 +31,18 @@ class RestCollectorPluginTest {
 
 	private static final Logger log = LoggerFactory.getLogger(RestCollectorPluginTest.class);
 
-	private final String baseUrl = "https://share.osf.io/api/v2/search/creativeworks/_search";
+	private final String baseUrl = "https://ddh-openapi.worldbank.org/search";
-	private final String resumptionType = "count";
+	private final String resumptionType = "discover";
-	private final String resumptionParam = "from";
+	private final String resumptionParam = "skip";
-	private final String entityXpath = "//hits/hits";
+	private final String entityXpath = "//*[local-name()='data']";
-	private final String resumptionXpath = "//hits";
+	private final String resumptionXpath = "";
-	private final String resultTotalXpath = "//hits/total";
+	private final String resultTotalXpath = "//*[local-name()='count']";
-	private final String resultFormatParam = "format";
+	private final String resultFormatParam = "";
 	private final String resultFormatValue = "json";
-	private final String resultSizeParam = "size";
+	private final String resultSizeParam = "top";
 	private final String resultSizeValue = "10";
 	// private String query = "q=%28sources%3ASocArXiv+AND+type%3Apreprint%29";
-	private final String query = "q=%28sources%3AengrXiv+AND+type%3Apreprint%29";
+	private final String query = "";
 	// private String query = "=(sources:engrXiv AND type:preprint)";
 
 	private final String protocolDescriptor = "rest_json2xml";
@@ -56,10 +62,12 @@ class RestCollectorPluginTest {
 		params.put("resultSizeValue", resultSizeValue);
 		params.put("queryParams", query);
 		params.put("entityXpath", entityXpath);
+		params.put("requestHeaderMap", "{\"User-Agent\": \"OpenAIRE DEV\"}");
 
 		api.setBaseUrl(baseUrl);
 		api.setParams(params);
 
+
 		rcp = new RestCollectorPlugin(new HttpClientParams());
 	}
 
@@ -78,4 +86,20 @@ class RestCollectorPluginTest {
 		log.info("{}", i.intValue());
 		Assertions.assertTrue(i.intValue() > 0);
 	}
+
+	@Disabled
+	@Test
+	void testUrl() throws IOException {
+		String url_s = "https://ddh-openapi.worldbank.org/search?&top=10";
+		URL url = new URL(url_s);
+		final HttpURLConnection conn = (HttpURLConnection) url.openConnection();
+		conn.setRequestMethod("GET");
+		conn.setRequestProperty("User-Agent", "OpenAIRE");
+		Gson gson = new Gson();
+		System.out.println("Request header");
+		System.out.println(gson.toJson(conn.getHeaderFields()));
+		InputStream inputStream = conn.getInputStream();
+
+
+	}
 }

dhp-workflows/dhp-aggregation/src/test/java/eu/dnetlib/dhp/collection/plugin/rest/RestIteratorTest.java

@@ -44,7 +44,7 @@ public class RestIteratorTest {
 
 		final RestIterator iterator = new RestIterator(clientParams, baseUrl, resumptionType, resumptionParam,
 			resumptionXpath, resultTotalXpath, resultFormatParam, resultFormatValue, resultSizeParam, resultSizeValue,
-			query, entityXpath, authMethod, authToken, resultOffsetParam);
+			query, entityXpath, authMethod, authToken, resultOffsetParam, null);
 		int i = 20;
 		while (iterator.hasNext() && i > 0) {
 			String result = iterator.next();