Improve plugin center error feedback and cache invalidation (#2147)

The plugin center cache was not invalidated when the proxy configuration was changed in the global settings. This caused stale and inconsistent state to be displayed to the user while there was no feedback that something was wrong.

gradle/changelog/config_change_plugin_center_invalidation.yaml

@@ -0,0 +1,4 @@
+- type: fixed
+  description: Invalidate plugin center cache on global configuration change ([#2147](https://github.com/scm-manager/scm-manager/pull/2147))
+- type: changed
+  description: Provide feedback on plugin center status ([#2147](https://github.com/scm-manager/scm-manager/pull/2147))

scm-core/src/main/java/sonia/scm/plugin/PluginCenterStatus.java

@@ -0,0 +1,34 @@
+/*
+ * 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.plugin;
+
+/**
+ * @since 2.40.0
+ */
+public enum PluginCenterStatus {
+  OK,
+  ERROR,
+  DEACTIVATED
+}

scm-core/src/main/java/sonia/scm/plugin/PluginManager.java

@@ -24,6 +24,10 @@
 
 package sonia.scm.plugin;
 
+import com.google.common.annotations.VisibleForTesting;
+import lombok.AllArgsConstructor;
+import lombok.Value;
+
 import java.util.List;
 import java.util.Optional;
 import java.util.Set;
@@ -57,6 +61,13 @@ public interface PluginManager {
    */
   List<InstalledPlugin> getInstalled();
 
+  /**
+   * @since 2.40.0
+   */
+  default PluginResult getPlugins() {
+    return new PluginResult(getInstalled(), getAvailable());
+  }
+
   /**
    * Returns all available plugins. The list contains the plugins which are loaded from the plugin center, but without
    * the installed plugins.
@@ -127,4 +138,22 @@ public interface PluginManager {
    * Update all installed plugins.
    */
   void updateAll();
+
+  /**
+   * Returned by {@link #getPlugins()}.
+   * @since 2.40.0
+   */
+  @Value
+  @AllArgsConstructor
+  class PluginResult {
+    List<InstalledPlugin> installedPlugins;
+    List<AvailablePlugin> availablePlugins;
+    PluginCenterStatus pluginCenterStatus;
+
+    @VisibleForTesting
+    public PluginResult(List<InstalledPlugin> installedPlugins, List<AvailablePlugin> availablePlugins) {
+      this(installedPlugins, availablePlugins, PluginCenterStatus.OK);
+    }
+
+  }
 }

scm-ui/ui-api/src/plugins.test.ts

@@ -114,6 +114,7 @@ describe("Test plugin hooks", () => {
     _embedded: {
       plugins,
     },
+    pluginCenterStatus: "OK",
   });
 
   const createPendingPlugins = (

scm-ui/ui-types/src/Plugin.ts

@@ -51,9 +51,11 @@ export type Plugin = HalRepresentation & {
   optionalDependencies: string[];
 };
 
+export type PluginCenterStatus = "OK" | "ERROR" | "DEACTIVATED";
+
 export type PluginCollection = HalRepresentationWithEmbedded<{
   plugins: Plugin[];
-}>;
+}> & { pluginCenterStatus: PluginCenterStatus };
 
 export const isPluginCollection = (input: HalRepresentation): input is PluginCollection =>
   input._embedded ? "plugins" in input._embedded : false;

scm-ui/ui-webapp/public/locales/de/admin.json

@@ -44,6 +44,10 @@
     "updateAll": "Alle Plugins aktualisieren",
     "cancelPending": "Änderungen abbrechen",
     "noPlugins": "Keine Plugins gefunden.",
+    "pluginCenterStatus": {
+      "ERROR": "Das Plugin Center ist nicht verfügbar. Plugins können weder installiert noch aktualisiert werden.",
+      "DEACTIVATED": "Das Plugin Center wurde in der Konfiguration deaktiviert. Plugins können weder installiert noch aktualisiert werden."
+    },
     "modal": {
       "title": {
         "install": "{{name}} Plugin installieren",

scm-ui/ui-webapp/public/locales/en/admin.json

@@ -44,6 +44,10 @@
     "updateAll": "Update All Plugins",
     "cancelPending": "Cancel Changes",
     "noPlugins": "No plugins found.",
+    "pluginCenterStatus": {
+      "ERROR": "The Plugin Center is not available. Plugins can neither be installed nor updated.",
+      "DEACTIVATED": "The Plugin Center is disabled in the configuration. Plugins can neither be installed nor updated."
+    },
     "modal": {
       "title": {
         "install": "Install {{name}} Plugin",

scm-ui/ui-webapp/src/admin/plugins/containers/PluginsOverview.tsx

@@ -32,7 +32,7 @@ import {
   Loading,
   Notification,
   Subtitle,
-  Title
+  Title,
 } from "@scm-manager/ui-components";
 import PluginsList from "../components/PluginList";
 import PluginTopActions from "../components/PluginTopActions";
@@ -45,7 +45,7 @@ import {
   useAvailablePlugins,
   useInstalledPlugins,
   usePendingPlugins,
-  usePluginCenterAuthInfo
+  usePluginCenterAuthInfo,
 } from "@scm-manager/ui-api";
 import PluginModal from "../components/PluginModal";
 import MyCloudoguBanner from "../components/MyCloudoguBanner";
@@ -55,7 +55,7 @@ export enum PluginAction {
   INSTALL = "install",
   UPDATE = "update",
   UNINSTALL = "uninstall",
-  CLOUDOGU = "cloudoguInstall"
+  CLOUDOGU = "cloudoguInstall",
 }
 
 export type PluginModalContent = {
@@ -72,12 +72,12 @@ const PluginsOverview: FC<Props> = ({ installed }) => {
   const {
     data: availablePlugins,
     isLoading: isLoadingAvailablePlugins,
-    error: availablePluginsError
+    error: availablePluginsError,
   } = useAvailablePlugins({ enabled: !installed });
   const {
     data: installedPlugins,
     isLoading: isLoadingInstalledPlugins,
-    error: installedPluginsError
+    error: installedPluginsError,
   } = useInstalledPlugins({ enabled: installed });
   const { data: pendingPlugins, isLoading: isLoadingPendingPlugins, error: pendingPluginsError } = usePendingPlugins();
   const pluginCenterAuthInfo = usePluginCenterAuthInfo();
@@ -177,21 +177,31 @@ const PluginsOverview: FC<Props> = ({ installed }) => {
   const computeUpdateAllSize = () => {
     const outdatedPlugins = collection?._embedded?.plugins.filter((p: Plugin) => p._links.update).length;
     return t("plugins.outdatedPlugins", {
-      count: outdatedPlugins
+      count: outdatedPlugins,
     });
   };
 
   const renderPluginsList = () => {
+    let pluginCenterStatusNotification: React.ReactNode;
+    if (collection && collection.pluginCenterStatus !== "OK") {
+      const type = collection.pluginCenterStatus === "DEACTIVATED" ? "info" : "danger";
+      pluginCenterStatusNotification = (
+        <Notification type={type}>{t(`plugins.pluginCenterStatus.${collection.pluginCenterStatus}`)}</Notification>
+      );
+    }
     if (collection?._embedded && collection._embedded.plugins.length > 0) {
       return (
+        <>
+          {pluginCenterStatusNotification}
           <PluginsList
             plugins={collection._embedded.plugins}
             openModal={setPluginModalContent}
             pluginCenterAuthInfo={pluginCenterAuthInfo.data}
           />
+        </>
       );
     }
-    return <Notification type="info">{t("plugins.noPlugins")}</Notification>;
+    return pluginCenterStatusNotification ?? <Notification type="info">{t("plugins.noPlugins")}</Notification>;
   };
 
   const renderModals = () => {

scm-webapp/src/main/java/sonia/scm/api/v2/resources/AvailablePluginResource.java

@@ -95,10 +95,10 @@ public class AvailablePluginResource {
   @Produces(VndMediaType.PLUGIN_COLLECTION)
   public Response getAvailablePlugins() {
     PluginPermissions.read().check();
-    List<InstalledPlugin> installed = pluginManager.getInstalled();
-    List<AvailablePlugin> available = pluginManager.getAvailable().stream().filter(a -> notInstalled(a, installed)).collect(Collectors.toList());
+    PluginManager.PluginResult plugins = pluginManager.getPlugins();
+    List<AvailablePlugin> available = plugins.getAvailablePlugins().stream().filter(a -> notInstalled(a, plugins.getInstalledPlugins())).collect(Collectors.toList());
 
-    return Response.ok(collectionMapper.mapAvailable(available)).build();
+    return Response.ok(collectionMapper.mapAvailable(available, plugins.getPluginCenterStatus())).build();
   }
 
   private boolean notInstalled(AvailablePlugin a, List<InstalledPlugin> installed) {

scm-webapp/src/main/java/sonia/scm/api/v2/resources/InstalledPluginResource.java

@@ -95,9 +95,8 @@ public class InstalledPluginResource {
   )
   public Response getInstalledPlugins() {
     PluginPermissions.read().check();
-    List<InstalledPlugin> plugins = pluginManager.getInstalled();
-    List<AvailablePlugin> available = pluginManager.getAvailable();
-    return Response.ok(collectionMapper.mapInstalled(plugins, available)).build();
+    PluginManager.PluginResult plugins = pluginManager.getPlugins();
+    return Response.ok(collectionMapper.mapInstalled(plugins)).build();
   }
 
   /**

scm-webapp/src/main/java/sonia/scm/api/v2/resources/PluginCollectionDto.java

@@ -0,0 +1,44 @@
+/*
+ * 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.api.v2.resources;
+
+import de.otto.edison.hal.Embedded;
+import de.otto.edison.hal.HalRepresentation;
+import de.otto.edison.hal.Links;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import sonia.scm.plugin.PluginCenterStatus;
+
+@Getter
+@NoArgsConstructor
+public class PluginCollectionDto extends HalRepresentation {
+
+  private PluginCenterStatus pluginCenterStatus;
+
+  public PluginCollectionDto(Links links, Embedded embedded, PluginCenterStatus pluginCenterStatus) {
+    super(links, embedded);
+    this.pluginCenterStatus = pluginCenterStatus;
+  }
+}

scm-webapp/src/main/java/sonia/scm/api/v2/resources/PluginDtoCollectionMapper.java

@@ -26,10 +26,9 @@ package sonia.scm.api.v2.resources;
 
 import com.google.inject.Inject;
 import de.otto.edison.hal.Embedded;
-import de.otto.edison.hal.HalRepresentation;
 import de.otto.edison.hal.Links;
 import sonia.scm.plugin.AvailablePlugin;
-import sonia.scm.plugin.InstalledPlugin;
+import sonia.scm.plugin.PluginCenterStatus;
 import sonia.scm.plugin.PluginManager;
 import sonia.scm.plugin.PluginPermissions;
 
@@ -53,17 +52,18 @@ public class PluginDtoCollectionMapper {
     this.manager = manager;
   }
 
-  public HalRepresentation mapInstalled(List<InstalledPlugin> plugins, List<AvailablePlugin> availablePlugins) {
+  public PluginCollectionDto mapInstalled(PluginManager.PluginResult plugins) {
     List<PluginDto> dtos = plugins
+      .getInstalledPlugins()
       .stream()
-      .map(i -> mapper.mapInstalled(i, availablePlugins))
+      .map(i -> mapper.mapInstalled(i, plugins.getAvailablePlugins()))
       .collect(toList());
-    return new HalRepresentation(createInstalledPluginsLinks(), embedDtos(dtos));
+    return new PluginCollectionDto(createInstalledPluginsLinks(), embedDtos(dtos), plugins.getPluginCenterStatus());
   }
 
-  public HalRepresentation mapAvailable(List<AvailablePlugin> plugins) {
+  public PluginCollectionDto mapAvailable(List<AvailablePlugin> plugins, PluginCenterStatus pluginCenterStatus) {
     List<PluginDto> dtos = plugins.stream().map(mapper::mapAvailable).collect(toList());
-    return new HalRepresentation(createAvailablePluginsLinks(plugins), embedDtos(dtos));
+    return new PluginCollectionDto(createAvailablePluginsLinks(plugins), embedDtos(dtos), pluginCenterStatus);
   }
 
   private Links createInstalledPluginsLinks() {

scm-webapp/src/main/java/sonia/scm/plugin/DefaultPluginManager.java

@@ -107,6 +107,17 @@ public class DefaultPluginManager implements PluginManager {
     updateMayUninstallFlag();
   }
 
+  @Override
+  public PluginResult getPlugins() {
+    PluginPermissions.read().check();
+    PluginCenterResult pluginCenterResult = center.getPluginResult();
+    return new PluginResult(
+      getInstalled(),
+      filterNotInstalledOrMoreUpToDate(pluginCenterResult.getPlugins()),
+      pluginCenterResult.getStatus()
+    );
+  }
+
   @Override
   public Optional<AvailablePlugin> getAvailable(String name) {
     PluginPermissions.read().check();
@@ -144,7 +155,11 @@ public class DefaultPluginManager implements PluginManager {
   @Override
   public List<AvailablePlugin> getAvailable() {
     PluginPermissions.read().check();
-    return center.getAvailablePlugins()
+    return filterNotInstalledOrMoreUpToDate(center.getAvailablePlugins());
+  }
+
+  private List<AvailablePlugin> filterNotInstalledOrMoreUpToDate(Set<AvailablePlugin> availablePlugins) {
+    return availablePlugins
       .stream()
       .filter(this::isNotInstalledOrMoreUpToDate)
       .map(p -> getPending(p.getDescriptor().getInformation().getName()).orElse(p))

scm-webapp/src/main/java/sonia/scm/plugin/PluginCenter.java

@@ -32,6 +32,7 @@ import sonia.scm.SCMContextProvider;
 import sonia.scm.cache.Cache;
 import sonia.scm.cache.CacheManager;
 import sonia.scm.config.ScmConfiguration;
+import sonia.scm.config.ScmConfigurationChangedEvent;
 import sonia.scm.util.HttpUtil;
 import sonia.scm.util.SystemUtil;
 
@@ -65,6 +66,12 @@ public class PluginCenter {
     pluginCenterResultCache.clear();
   }
 
+  @Subscribe
+  public void handle(ScmConfigurationChangedEvent event) {
+    LOG.debug("clear plugin center cache, because of {}", event);
+    pluginCenterResultCache.clear();
+  }
+
   synchronized Set<AvailablePlugin> getAvailablePlugins() {
     String url = buildPluginUrl(configuration.getPluginUrl());
     return getPluginCenterResult(url).getPlugins();
@@ -75,6 +82,11 @@ public class PluginCenter {
     return getPluginCenterResult(url).getPluginSets();
   }
 
+  synchronized PluginCenterResult getPluginResult() {
+    String url = buildPluginUrl(configuration.getPluginUrl());
+    return getPluginCenterResult(url);
+  }
+
   private PluginCenterResult getPluginCenterResult(String url) {
     PluginCenterResult pluginCenterResult = pluginCenterResultCache.get(url);
     if (pluginCenterResult == null) {

scm-webapp/src/main/java/sonia/scm/plugin/PluginCenterLoader.java

@@ -25,6 +25,7 @@
 package sonia.scm.plugin;
 
 import com.google.common.annotations.VisibleForTesting;
+import com.google.common.base.Strings;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import sonia.scm.event.ScmEventBus;
@@ -32,7 +33,6 @@ import sonia.scm.net.ahc.AdvancedHttpClient;
 import sonia.scm.net.ahc.AdvancedHttpRequest;
 
 import javax.inject.Inject;
-import java.util.Collections;
 
 import static sonia.scm.plugin.Tracing.SPAN_KIND;
 
@@ -65,6 +65,10 @@ class PluginCenterLoader {
 
   PluginCenterResult load(String url) {
     try {
+      if (Strings.isNullOrEmpty(url)) {
+        LOG.info("plugin center is deactivated, returning empty list");
+        return new PluginCenterResult(PluginCenterStatus.DEACTIVATED);
+      }
       LOG.info("fetch plugins from {}", url);
       AdvancedHttpRequest request = client.get(url).spanKind(SPAN_KIND);
       if (authenticator.isAuthenticated()) {
@@ -75,7 +79,7 @@ class PluginCenterLoader {
     } catch (Exception ex) {
       LOG.error("failed to load plugins from plugin center, returning empty list", ex);
       eventBus.post(new PluginCenterErrorEvent());
-      return new PluginCenterResult(Collections.emptySet(), Collections.emptySet());
+      return new PluginCenterResult(PluginCenterStatus.ERROR);
     }
   }
 }

scm-webapp/src/main/java/sonia/scm/plugin/PluginCenterResult.java

@@ -27,6 +27,7 @@ package sonia.scm.plugin;
 import lombok.AllArgsConstructor;
 import lombok.Getter;
 
+import java.util.Collections;
 import java.util.Set;
 
 @AllArgsConstructor
@@ -34,4 +35,18 @@ import java.util.Set;
 class PluginCenterResult {
   private Set<AvailablePlugin> plugins;
   private Set<PluginSet> pluginSets;
+  private PluginCenterStatus status;
+
+  public PluginCenterResult() {
+    this(Collections.emptySet(), Collections.emptySet(), PluginCenterStatus.OK);
+  }
+
+  public PluginCenterResult(PluginCenterStatus status) {
+    this(Collections.emptySet(), Collections.emptySet(), status);
+  }
+
+  public PluginCenterResult(Set<AvailablePlugin> plugins, Set<PluginSet> pluginSets) {
+    this(plugins, pluginSets, PluginCenterStatus.OK);
+  }
+
 }

scm-webapp/src/test/java/sonia/scm/api/v2/resources/AvailablePluginResourceTest.java

@@ -24,7 +24,6 @@
 
 package sonia.scm.api.v2.resources;
 
-import de.otto.edison.hal.HalRepresentation;
 import org.apache.shiro.authz.UnauthorizedException;
 import org.apache.shiro.subject.Subject;
 import org.apache.shiro.util.ThreadContext;
@@ -42,6 +41,7 @@ import sonia.scm.plugin.AvailablePlugin;
 import sonia.scm.plugin.AvailablePluginDescriptor;
 import sonia.scm.plugin.InstalledPlugin;
 import sonia.scm.plugin.InstalledPluginDescriptor;
+import sonia.scm.plugin.PluginCenterStatus;
 import sonia.scm.plugin.PluginCondition;
 import sonia.scm.plugin.PluginInformation;
 import sonia.scm.plugin.PluginManager;
@@ -116,9 +116,9 @@ class AvailablePluginResourceTest {
     void getAvailablePlugins() throws URISyntaxException, UnsupportedEncodingException {
       AvailablePlugin plugin = createAvailablePlugin();
 
-      when(pluginManager.getAvailable()).thenReturn(Collections.singletonList(plugin));
-      when(pluginManager.getInstalled()).thenReturn(Collections.emptyList());
-      when(collectionMapper.mapAvailable(Collections.singletonList(plugin))).thenReturn(new MockedResultDto());
+      when(pluginManager.getPlugins()).thenReturn(new PluginManager.PluginResult(Collections.emptyList(), Collections.singletonList(plugin)));
+
+      when(collectionMapper.mapAvailable(Collections.singletonList(plugin), PluginCenterStatus.OK)).thenReturn(new MockedResultDto());
 
       MockHttpRequest request = MockHttpRequest.get("/v2/plugins/available");
       request.accept(VndMediaType.PLUGIN_COLLECTION);
@@ -135,9 +135,8 @@ class AvailablePluginResourceTest {
       AvailablePlugin availablePlugin = createAvailablePlugin();
       InstalledPlugin installedPlugin = createInstalledPlugin();
 
-      when(pluginManager.getAvailable()).thenReturn(Collections.singletonList(availablePlugin));
-      when(pluginManager.getInstalled()).thenReturn(Collections.singletonList(installedPlugin));
-      lenient().when(collectionMapper.mapAvailable(Collections.singletonList(availablePlugin))).thenReturn(new MockedResultDto());
+      when(pluginManager.getPlugins()).thenReturn(new PluginManager.PluginResult(Collections.singletonList(installedPlugin), Collections.singletonList(availablePlugin)));
+      lenient().when(collectionMapper.mapAvailable(Collections.singletonList(availablePlugin), PluginCenterStatus.OK)).thenReturn(new MockedResultDto());
 
       MockHttpRequest request = MockHttpRequest.get("/v2/plugins/available");
       request.accept(VndMediaType.PLUGIN_COLLECTION);
@@ -261,7 +260,7 @@ class AvailablePluginResourceTest {
     }
   }
 
-  public class MockedResultDto extends HalRepresentation {
+  public class MockedResultDto extends PluginCollectionDto {
     public String getMarker() {
       return "x";
     }

scm-webapp/src/test/java/sonia/scm/api/v2/resources/InstalledPluginResourceTest.java

@@ -24,7 +24,6 @@
     
 package sonia.scm.api.v2.resources;
 
-import de.otto.edison.hal.HalRepresentation;
 import org.apache.shiro.authz.UnauthorizedException;
 import org.apache.shiro.subject.Subject;
 import org.apache.shiro.util.ThreadContext;
@@ -110,8 +109,9 @@ class InstalledPluginResourceTest {
     @Test
     void getInstalledPlugins() throws URISyntaxException, UnsupportedEncodingException {
       InstalledPlugin installedPlugin = createInstalled("");
-      when(pluginManager.getInstalled()).thenReturn(Collections.singletonList(installedPlugin));
-      when(collectionMapper.mapInstalled(Collections.singletonList(installedPlugin), Collections.emptyList())).thenReturn(new MockedResultDto());
+      PluginManager.PluginResult pluginResult = new PluginManager.PluginResult(Collections.singletonList(installedPlugin), emptyList());
+      when(pluginManager.getPlugins()).thenReturn(pluginResult);
+      when(collectionMapper.mapInstalled(pluginResult)).thenReturn(new MockedResultDto());
 
       MockHttpRequest request = MockHttpRequest.get("/v2/plugins/installed");
       request.accept(VndMediaType.PLUGIN_COLLECTION);
@@ -184,7 +184,8 @@ class InstalledPluginResourceTest {
     }
   }
 
-  public class MockedResultDto extends HalRepresentation {
+  public class MockedResultDto extends PluginCollectionDto {
+
     public String getMarker() {
       return "x";
     }

scm-webapp/src/test/java/sonia/scm/api/v2/resources/PluginDtoCollectionMapperTest.java

@@ -41,14 +41,15 @@ import sonia.scm.plugin.AvailablePlugin;
 import sonia.scm.plugin.AvailablePluginDescriptor;
 import sonia.scm.plugin.InstalledPlugin;
 import sonia.scm.plugin.InstalledPluginDescriptor;
+import sonia.scm.plugin.PluginCenterStatus;
 import sonia.scm.plugin.PluginInformation;
 import sonia.scm.plugin.PluginManager;
 
 import java.net.URI;
 import java.util.ArrayList;
 import java.util.List;
-import java.util.stream.Collectors;
 
+import static java.util.Collections.emptyList;
 import static java.util.Collections.singletonList;
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.mockito.Mockito.lenient;
@@ -88,14 +89,23 @@ class PluginDtoCollectionMapperTest {
     ThreadContext.unbindSubject();
   }
 
+  @Test
+  void shouldMapErrorStatus() {
+    PluginDtoCollectionMapper mapper = new PluginDtoCollectionMapper(resourceLinks, pluginDtoMapper, manager);
+
+    assertThat(mapper.mapInstalled(emptyPluginResult(PluginCenterStatus.ERROR)).getPluginCenterStatus()).isEqualTo(PluginCenterStatus.ERROR);
+    assertThat(mapper.mapInstalled(emptyPluginResult(PluginCenterStatus.OK)).getPluginCenterStatus()).isEqualTo(PluginCenterStatus.OK);
+    assertThat(mapper.mapAvailable(emptyList(), PluginCenterStatus.ERROR).getPluginCenterStatus()).isEqualTo(PluginCenterStatus.ERROR);
+    assertThat(mapper.mapAvailable(emptyList(), PluginCenterStatus.OK).getPluginCenterStatus()).isEqualTo(PluginCenterStatus.OK);
+  }
 
   @Test
   void shouldMapInstalledPluginsWithoutUpdateWhenNoNewerVersionIsAvailable() {
     PluginDtoCollectionMapper mapper = new PluginDtoCollectionMapper(resourceLinks, pluginDtoMapper, manager);
 
-    HalRepresentation result = mapper.mapInstalled(
+    HalRepresentation result = mapper.mapInstalled(new PluginManager.PluginResult(
       singletonList(createInstalledPlugin("scm-some-plugin", "1")),
-      singletonList(createAvailablePlugin("scm-other-plugin", "2")));
+      singletonList(createAvailablePlugin("scm-other-plugin", "2"))));
 
     List<HalRepresentation> plugins = result.getEmbedded().getItemsBy("plugins");
     assertThat(plugins).hasSize(1);
@@ -108,9 +118,9 @@ class PluginDtoCollectionMapperTest {
   void shouldSetNewVersionInInstalledPluginWhenAvailableVersionIsNewer() {
     PluginDtoCollectionMapper mapper = new PluginDtoCollectionMapper(resourceLinks, pluginDtoMapper, manager);
 
-    HalRepresentation result = mapper.mapInstalled(
+    HalRepresentation result = mapper.mapInstalled(new PluginManager.PluginResult(
       singletonList(createInstalledPlugin("scm-some-plugin", "1")),
-      singletonList(createAvailablePlugin("scm-some-plugin", "2")));
+      singletonList(createAvailablePlugin("scm-some-plugin", "2"))));
 
     PluginDto plugin = getPluginDtoFromResult(result);
     assertThat(plugin.getVersion()).isEqualTo("1");
@@ -122,9 +132,9 @@ class PluginDtoCollectionMapperTest {
     when(subject.isPermitted("plugin:write")).thenReturn(false);
     PluginDtoCollectionMapper mapper = new PluginDtoCollectionMapper(resourceLinks, pluginDtoMapper, manager);
 
-    HalRepresentation result = mapper.mapInstalled(
+    HalRepresentation result = mapper.mapInstalled(new PluginManager.PluginResult(
       singletonList(createInstalledPlugin("scm-some-plugin", "1")),
-      singletonList(createAvailablePlugin("scm-some-plugin", "2")));
+      singletonList(createAvailablePlugin("scm-some-plugin", "2"))));
 
     PluginDto plugin = getPluginDtoFromResult(result);
     assertThat(plugin.getLinks().getLinkBy("update")).isEmpty();
@@ -137,9 +147,9 @@ class PluginDtoCollectionMapperTest {
 
     AvailablePlugin availablePlugin = createAvailablePlugin("scm-some-plugin", "2");
     when(availablePlugin.isPending()).thenReturn(true);
-    HalRepresentation result = mapper.mapInstalled(
+    HalRepresentation result = mapper.mapInstalled(new PluginManager.PluginResult(
       singletonList(createInstalledPlugin("scm-some-plugin", "1")),
-      singletonList(availablePlugin));
+      singletonList(availablePlugin)));
 
     PluginDto plugin = getPluginDtoFromResult(result);
     assertThat(plugin.getLinks().getLinkBy("update")).isEmpty();
@@ -150,9 +160,9 @@ class PluginDtoCollectionMapperTest {
     when(subject.isPermitted("plugin:write")).thenReturn(true);
     PluginDtoCollectionMapper mapper = new PluginDtoCollectionMapper(resourceLinks, pluginDtoMapper, manager);
 
-    HalRepresentation result = mapper.mapInstalled(
+    HalRepresentation result = mapper.mapInstalled(new PluginManager.PluginResult(
       singletonList(createInstalledPlugin("scm-some-plugin", "1")),
-      singletonList(createAvailablePlugin("scm-some-plugin", "2")));
+      singletonList(createAvailablePlugin("scm-some-plugin", "2"))));
 
     PluginDto plugin = getPluginDtoFromResult(result);
     assertThat(plugin.getLinks().getLinkBy("update")).isNotEmpty();
@@ -164,9 +174,9 @@ class PluginDtoCollectionMapperTest {
     when(subject.isPermitted("plugin:write")).thenReturn(true);
     PluginDtoCollectionMapper mapper = new PluginDtoCollectionMapper(resourceLinks, pluginDtoMapper, manager);
 
-    HalRepresentation result = mapper.mapInstalled(
+    HalRepresentation result = mapper.mapInstalled(new PluginManager.PluginResult(
       singletonList(createInstalledPlugin("scm-some-plugin", "1")),
-      singletonList(createAvailablePlugin("scm-some-plugin", "2")));
+      singletonList(createAvailablePlugin("scm-some-plugin", "2"))));
 
     PluginDto plugin = getPluginDtoFromResult(result);
     assertThat(plugin.getLinks().getLinkBy("update")).isNotEmpty();
@@ -180,9 +190,9 @@ class PluginDtoCollectionMapperTest {
 
     AvailablePlugin availablePlugin = createAvailablePlugin("scm-some-plugin", "2");
     when(availablePlugin.isPending()).thenReturn(true);
-    HalRepresentation result = mapper.mapInstalled(
+    HalRepresentation result = mapper.mapInstalled(new PluginManager.PluginResult(
       singletonList(createInstalledPlugin("scm-some-plugin", "1")),
-      singletonList(availablePlugin));
+      singletonList(availablePlugin)));
 
     PluginDto plugin = getPluginDtoFromResult(result);
     assertThat(plugin.isPending()).isTrue();
@@ -223,4 +233,12 @@ class PluginDtoCollectionMapperTest {
     lenient().when(plugin.getDescriptor()).thenReturn(descriptor);
     return plugin;
   }
+
+  private static PluginManager.PluginResult emptyPluginResult(PluginCenterStatus status) {
+    return new PluginManager.PluginResult(
+      emptyList(),
+      emptyList(),
+      status
+    );
+  }
 }

scm-webapp/src/test/java/sonia/scm/plugin/DefaultPluginManagerTest.java

@@ -54,6 +54,7 @@ import java.util.Optional;
 import java.util.Set;
 
 import static java.util.Arrays.asList;
+import static java.util.Collections.emptySet;
 import static java.util.Collections.singleton;
 import static java.util.Collections.singletonList;
 import static org.assertj.core.api.Assertions.assertThat;
@@ -133,6 +134,27 @@ class DefaultPluginManagerTest {
       ThreadContext.unbindSubject();
     }
 
+    @Test
+    void shouldReturnSuccessfulPluginResult() {
+      AvailablePlugin editor = createAvailable("scm-editor-plugin");
+      AvailablePlugin jenkins = createAvailable("scm-jenkins-plugin");
+      InstalledPlugin review = createInstalled("scm-review-plugin");
+      InstalledPlugin git = createInstalled("scm-git-plugin");
+
+      when(center.getPluginResult()).thenReturn(new PluginCenterResult(
+        ImmutableSet.of(editor, jenkins),
+        emptySet())
+      );
+
+      when(loader.getInstalledPlugins()).thenReturn(ImmutableList.of(review, git));
+
+      PluginManager.PluginResult plugins = manager.getPlugins();
+
+      assertThat(plugins.getAvailablePlugins()).containsOnly(editor, jenkins);
+      assertThat(plugins.getInstalledPlugins()).containsOnly(review, git);
+      assertThat(plugins.getPluginCenterStatus()).isEqualTo(PluginCenterStatus.OK);
+    }
+
     @Test
     void shouldReturnInstalledPlugins() {
       InstalledPlugin review = createInstalled("scm-review-plugin");
@@ -746,6 +768,7 @@ class DefaultPluginManagerTest {
       assertThrows(AuthorizationException.class, () -> manager.getAvailable());
       assertThrows(AuthorizationException.class, () -> manager.getAvailable("test"));
       assertThrows(AuthorizationException.class, () -> manager.getPluginSets());
+      assertThrows(AuthorizationException.class, () -> manager.getPlugins());
     }
 
   }

scm-webapp/src/test/java/sonia/scm/plugin/PluginCenterLoaderTest.java

@@ -79,6 +79,7 @@ class PluginCenterLoaderTest {
     PluginCenterResult fetched = loader.load(PLUGIN_URL);
     assertThat(fetched.getPlugins()).isSameAs(plugins);
     assertThat(fetched.getPluginSets()).isSameAs(pluginSets);
+    assertThat(fetched.getStatus()).isEqualTo(PluginCenterStatus.OK);
   }
 
   private AdvancedHttpResponse request() throws IOException {
@@ -88,6 +89,14 @@ class PluginCenterLoaderTest {
     return response;
   }
 
+  @Test
+  void shouldReturnEmptySetIfPluginCenterIsDeactivated() {
+    PluginCenterResult fetch = loader.load("");
+    assertThat(fetch.getPlugins()).isEmpty();
+    assertThat(fetch.getPluginSets()).isEmpty();
+    assertThat(fetch.getStatus()).isSameAs(PluginCenterStatus.DEACTIVATED);
+  }
+
   @Test
   void shouldReturnEmptySetIfPluginCenterNotBeReached() throws IOException {
     when(client.get(PLUGIN_URL)).thenReturn(request);
@@ -96,6 +105,7 @@ class PluginCenterLoaderTest {
     PluginCenterResult fetch = loader.load(PLUGIN_URL);
     assertThat(fetch.getPlugins()).isEmpty();
     assertThat(fetch.getPluginSets()).isEmpty();
+    assertThat(fetch.getStatus()).isSameAs(PluginCenterStatus.ERROR);
   }
 
   @Test

scm-webapp/src/test/java/sonia/scm/plugin/PluginCenterTest.java

@@ -33,8 +33,8 @@ import sonia.scm.SCMContextProvider;
 import sonia.scm.cache.CacheManager;
 import sonia.scm.cache.MapCacheManager;
 import sonia.scm.config.ScmConfiguration;
+import sonia.scm.config.ScmConfigurationChangedEvent;
 
-import java.util.Collections;
 import java.util.HashSet;
 import java.util.Set;
 
@@ -92,7 +92,7 @@ class PluginCenterTest {
     Set<PluginSet> pluginSets = new HashSet<>();
 
     PluginCenterResult first = new PluginCenterResult(plugins, pluginSets);
-    when(loader.load(anyString())).thenReturn(first, new PluginCenterResult(Collections.emptySet(), Collections.emptySet()));
+    when(loader.load(anyString())).thenReturn(first, new PluginCenterResult());
 
     assertThat(pluginCenter.getAvailablePlugins()).isSameAs(plugins);
     assertThat(pluginCenter.getAvailablePlugins()).isSameAs(plugins);
@@ -101,12 +101,12 @@ class PluginCenterTest {
 
   @Test
   @SuppressWarnings("unchecked")
-  void shouldClearCache() {
+  void shouldClearCacheOnPluginCenterLogin() {
     Set<AvailablePlugin> plugins = new HashSet<>();
     Set<PluginSet> pluginSets = new HashSet<>();
 
     PluginCenterResult first = new PluginCenterResult(plugins, pluginSets);
-    when(loader.load(anyString())).thenReturn(first, new PluginCenterResult(Collections.emptySet(), Collections.emptySet()));
+    when(loader.load(anyString())).thenReturn(first, new PluginCenterResult());
 
     assertThat(pluginCenter.getAvailablePlugins()).isSameAs(plugins);
     assertThat(pluginCenter.getAvailablePluginSets()).isSameAs(pluginSets);
@@ -115,6 +115,22 @@ class PluginCenterTest {
     assertThat(pluginCenter.getAvailablePluginSets()).isNotSameAs(pluginSets);
   }
 
+  @Test
+  @SuppressWarnings("unchecked")
+  void shouldClearCacheOnConfigChange() {
+    Set<AvailablePlugin> plugins = new HashSet<>();
+    Set<PluginSet> pluginSets = new HashSet<>();
+
+    PluginCenterResult first = new PluginCenterResult(plugins, pluginSets);
+    when(loader.load(anyString())).thenReturn(first, new PluginCenterResult());
+
+    assertThat(pluginCenter.getAvailablePlugins()).isSameAs(plugins);
+    assertThat(pluginCenter.getAvailablePluginSets()).isSameAs(pluginSets);
+    pluginCenter.handle(new ScmConfigurationChangedEvent(null));
+    assertThat(pluginCenter.getAvailablePlugins()).isNotSameAs(plugins);
+    assertThat(pluginCenter.getAvailablePluginSets()).isNotSameAs(pluginSets);
+  }
+
   @Test
   void shouldLoadOnRefresh() {
     Set<AvailablePlugin> plugins = new HashSet<>();