Fix the Image.sc search plugin

It seems that Discourse has changed their API, and in particular
made it stricter with respect to needing an API key.

Author: ctrueden

src/main/java/org/scijava/search/web/ImageScSearcher.java

@@ -29,15 +29,16 @@
 package org.scijava.search.web;
 
 import com.google.gson.JsonArray;
-import com.google.gson.JsonElement;
 import com.google.gson.JsonObject;
 import com.google.gson.JsonStreamParser;
 
 import java.io.BufferedReader;
+import java.io.DataOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
 import java.io.UnsupportedEncodingException;
+import java.net.HttpURLConnection;
 import java.net.MalformedURLException;
 import java.net.URL;
 import java.net.URLEncoder;
@@ -62,7 +63,7 @@
 @Plugin(type = Searcher.class, enabled = false)
 public class ImageScSearcher implements Searcher {
 
-	private static String URL_PREFIX = "https://forum.image.sc/search/query.json?term=";
+	private static String URL_PREFIX = "https://forum.image.sc/search.json?q=";
 	private static String POST_URL_PREFIX = "https://forum.image.sc/t";
 	private static String FORUM_AVATAR_PREFIX = "https://forum.image.sc";
 	private static String TERM_SUFFIX = " tags:imagej";
@@ -82,7 +83,15 @@ public List<SearchResult> search(String text, boolean fuzzy) {
 
 		try {
 			final URL url = new URL(URL_PREFIX + URLEncoder.encode(text + TERM_SUFFIX, "utf-8"));
-			InputStream is = url.openStream();
+
+			// Pass the API key as a header parameter.
+			HttpURLConnection con = (HttpURLConnection) url.openConnection();
+			con.setRequestMethod("GET");
+			con.setRequestProperty("Api-Username", "imagesc-bot");
+			con.setRequestProperty("Api-Key", "b1a28dbb29c385e06026482661c8de55dd01972ff993bea6547783e52e8a017d");
+
+			// Connect and read the result.
+			InputStream is = con.getInputStream();
 			try (InputStreamReader sr = new InputStreamReader(is, "UTF-8");
 					BufferedReader reader = new BufferedReader(sr))
 			{
@@ -138,4 +147,21 @@ private String formatDate(final String datestr) {
 		return new PrettyTime().format(Date.from(instant));
 	}
 
+	// Credit: https://www.baeldung.com/java-http-request
+	public static String getParamsString(final Map<String, String> params)
+		throws UnsupportedEncodingException
+	{
+		StringBuilder result = new StringBuilder();
+
+		for (Map.Entry<String, String> entry : params.entrySet()) {
+			result.append(URLEncoder.encode(entry.getKey(), "UTF-8"));
+			result.append("=");
+			result.append(URLEncoder.encode(entry.getValue(), "UTF-8"));
+			result.append("&");
+		}
+
+		String resultString = result.toString();
+		return resultString.length() > 0 ? //
+			resultString.substring(0, resultString.length() - 1) : resultString;
+	}
 }

src/test/java/org/scijava/search/web/ImageScSearcherTest.java

@@ -0,0 +1,60 @@
+/*-
+ * #%L
+ * Search framework for SciJava applications.
+ * %%
+ * Copyright (C) 2017 - 2023 SciJava developers.
+ * %%
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * 
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ * #L%
+ */
+package org.scijava.search.web;
+
+import static org.junit.Assert.assertEquals;
+
+import java.util.List;
+
+import org.junit.Test;
+import org.scijava.Context;
+import org.scijava.log.LogService;
+import org.scijava.search.SearchResult;
+
+/**
+ * Tests {@link ImageScSearcher}.
+ *
+ * @author Curtis Rueden
+ */
+public class ImageScSearcherTest {
+
+	@Test
+	public void testSimpleSearch() {
+		try (final Context ctx = new Context(LogService.class)) {
+			final String query = "before:2015-12-31 in:title bonej";
+			final ImageScSearcher searcher = new ImageScSearcher();
+			ctx.inject(searcher);
+			final List<SearchResult> results = searcher.search(query, false);
+			assertEquals(3, results.size());
+			assertEquals("https://forum.image.sc/t/251/1", results.get(0).properties().get("URL"));
+			assertEquals("https://forum.image.sc/t/465/1", results.get(1).properties().get("URL"));
+			assertEquals("https://forum.image.sc/t/162/1", results.get(2).properties().get("URL"));
+		}
+	}
+}