create admin info resource // fix rss feed parsing

scm-webapp/src/main/java/sonia/scm/admin/ReleaseFeedParser.java

@@ -0,0 +1,64 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2020-present Cloudogu GmbH and Contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package sonia.scm.admin;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import sonia.scm.net.ahc.AdvancedHttpClient;
+
+import javax.inject.Inject;
+import java.io.IOException;
+import java.time.Instant;
+import java.util.Comparator;
+import java.util.Optional;
+
+public class ReleaseFeedParser {
+
+  private static final Logger LOG = LoggerFactory.getLogger(ReleaseFeedParser.class);
+
+  private final AdvancedHttpClient client;
+
+  @Inject
+  public ReleaseFeedParser(AdvancedHttpClient client) {
+    this.client = client;
+  }
+
+  Optional<ReleaseInfo> findLatestRelease(String url) throws IOException {
+    LOG.info("Search for newer versions of SCM-Manager");
+    ReleaseFeedDto releaseFeed = client.get(url).request().contentFromXml(ReleaseFeedDto.class);
+    Optional<ReleaseFeedDto.Release> latestRelease = filterForLatestRelease(releaseFeed);
+    if (latestRelease.isPresent()) {
+      ReleaseFeedDto.Release release = latestRelease.get();
+      return Optional.of(new ReleaseInfo(release.getTitle(), release.getLink(), Instant.now()));
+    }
+    return Optional.empty();
+  }
+
+  private Optional<ReleaseFeedDto.Release> filterForLatestRelease(ReleaseFeedDto releaseFeed) {
+    return releaseFeed.getChannel().getReleases()
+      .stream()
+      .max(Comparator.comparing(ReleaseFeedDto.Release::getPubDate));
+  }
+}