[FEATURE] ListDownloader.

LauncherAPI/src/main/java/ru/gravit/launcher/downloader/ListDownloader.java

@@ -0,0 +1,52 @@
+package ru.gravit.launcher.downloader;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.net.URL;
+import java.nio.file.Path;
+import java.util.List;
+
+import org.apache.http.HttpResponse;
+import org.apache.http.client.ClientProtocolException;
+import org.apache.http.client.ResponseHandler;
+import org.apache.http.client.methods.HttpGet;
+import org.apache.http.impl.client.CloseableHttpClient;
+import org.apache.http.impl.client.HttpClients;
+import org.apache.http.impl.client.LaxRedirectStrategy;
+
+import ru.gravit.utils.helper.IOHelper;
+
+public class ListDownloader {
+    public void download(String base, List<String> applies, Path dstDirFile) throws IOException, URISyntaxException {
+        try(CloseableHttpClient httpclient = HttpClients.custom()
+                .setRedirectStrategy(new LaxRedirectStrategy())
+                .build()) {
+        
+            HttpGet get = null; 
+            for (String apply : applies) {
+            	URI u = new URL(base.concat(apply)).toURI();
+            	if (get == null) get = new HttpGet(u);
+            	else {
+            		get.reset();
+            		get.setURI(u);
+            	}
+            	httpclient.execute(get, new FileDownloadResponseHandler(dstDirFile.resolve(apply)));
+        	}
+        } 
+    }
+    
+    static class FileDownloadResponseHandler implements ResponseHandler<Path> {
+        private final Path target;
+        public FileDownloadResponseHandler(Path target) {
+            this.target = target;
+        }
+        @Override
+        public Path handleResponse(HttpResponse response) throws ClientProtocolException, IOException {
+            InputStream source = response.getEntity().getContent();
+            IOHelper.transfer(source, this.target);
+            return this.target;
+        }
+    }
+}