add collection update link if atleast one plugin is updatable

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

@@ -73,6 +73,13 @@ public interface PluginManager {
    */
   List<AvailablePlugin> getAvailable();
 
+  /**
+   * Returns all updatable plugins.
+   *
+   * @return a list of updatable plugins.
+   */
+  List<InstalledPlugin> getUpdatable();
+
   /**
    * Installs the plugin with the given name from the list of available plugins.
    *

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

@@ -3,16 +3,15 @@ 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.Link;
 import de.otto.edison.hal.Links;
 import sonia.scm.plugin.AvailablePlugin;
 import sonia.scm.plugin.InstalledPlugin;
-import sonia.scm.plugin.PluginPermissions;
+import sonia.scm.plugin.PluginManager;
 
 import java.util.List;
 
 import static de.otto.edison.hal.Embedded.embeddedBuilder;
-import static de.otto.edison.hal.Link.*;
+import static de.otto.edison.hal.Link.link;
 import static de.otto.edison.hal.Links.linkingTo;
 import static java.util.stream.Collectors.toList;
 
@@ -20,11 +19,13 @@ public class PluginDtoCollectionMapper {
 
   private final ResourceLinks resourceLinks;
   private final PluginDtoMapper mapper;
+  private final PluginManager manager;
 
   @Inject
-  public PluginDtoCollectionMapper(ResourceLinks resourceLinks, PluginDtoMapper mapper) {
+  public PluginDtoCollectionMapper(ResourceLinks resourceLinks, PluginDtoMapper mapper, PluginManager manager) {
     this.resourceLinks = resourceLinks;
     this.mapper = mapper;
+    this.manager = manager;
   }
 
   public HalRepresentation mapInstalled(List<InstalledPlugin> plugins, List<AvailablePlugin> availablePlugins) {
@@ -46,7 +47,9 @@ public class PluginDtoCollectionMapper {
     Links.Builder linksBuilder = linkingTo()
       .with(Links.linkingTo().self(baseUrl).build());
 
+    if (!manager.getUpdatable().isEmpty()) {
       linksBuilder.single(link("update", resourceLinks.installedPluginCollection().update()));
+    }
 
     return linksBuilder.build();
   }

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

@@ -139,6 +139,14 @@ public class DefaultPluginManager implements PluginManager {
       .collect(Collectors.toList());
   }
 
+  @Override
+  public List<InstalledPlugin> getUpdatable() {
+    return getInstalled()
+      .stream()
+      .filter(p -> isUpdatable(p.getDescriptor().getInformation().getName()))
+      .collect(Collectors.toList());
+  }
+
   private <T extends Plugin> Predicate<T> filterByName(String name) {
     return plugin -> name.equals(plugin.getDescriptor().getInformation().getName());
   }

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

@@ -10,15 +10,19 @@ import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
 import org.mockito.InjectMocks;
+import org.mockito.Mock;
 import org.mockito.junit.jupiter.MockitoExtension;
 import sonia.scm.plugin.AvailablePlugin;
 import sonia.scm.plugin.AvailablePluginDescriptor;
 import sonia.scm.plugin.InstalledPlugin;
 import sonia.scm.plugin.InstalledPluginDescriptor;
 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.singletonList;
 import static org.assertj.core.api.Assertions.assertThat;
@@ -34,6 +38,9 @@ class PluginDtoCollectionMapperTest {
   @InjectMocks
   PluginDtoMapperImpl pluginDtoMapper;
 
+  @Mock
+  PluginManager manager;
+
   Subject subject = mock(Subject.class);
   ThreadState subjectThreadState = new SubjectThreadState(subject);
 
@@ -43,6 +50,11 @@ class PluginDtoCollectionMapperTest {
     ThreadContext.bind(subject);
   }
 
+  @BeforeEach
+  void mockPluginManager() {
+    lenient().when(manager.getUpdatable()).thenReturn(new ArrayList<>());
+  }
+
   @AfterEach
   public void unbindSubject() {
     ThreadContext.unbindSubject();
@@ -51,7 +63,7 @@ class PluginDtoCollectionMapperTest {
 
   @Test
   void shouldMapInstalledPluginsWithoutUpdateWhenNoNewerVersionIsAvailable() {
-    PluginDtoCollectionMapper mapper = new PluginDtoCollectionMapper(resourceLinks, pluginDtoMapper);
+    PluginDtoCollectionMapper mapper = new PluginDtoCollectionMapper(resourceLinks, pluginDtoMapper, manager);
 
     HalRepresentation result = mapper.mapInstalled(
       singletonList(createInstalledPlugin("scm-some-plugin", "1")),
@@ -66,7 +78,7 @@ class PluginDtoCollectionMapperTest {
 
   @Test
   void shouldSetNewVersionInInstalledPluginWhenAvailableVersionIsNewer() {
-    PluginDtoCollectionMapper mapper = new PluginDtoCollectionMapper(resourceLinks, pluginDtoMapper);
+    PluginDtoCollectionMapper mapper = new PluginDtoCollectionMapper(resourceLinks, pluginDtoMapper,manager);
 
     HalRepresentation result = mapper.mapInstalled(
       singletonList(createInstalledPlugin("scm-some-plugin", "1")),
@@ -80,7 +92,7 @@ class PluginDtoCollectionMapperTest {
   @Test
   void shouldNotAddInstallLinkForNewVersionWhenNotPermitted() {
     when(subject.isPermitted("plugin:manage")).thenReturn(false);
-    PluginDtoCollectionMapper mapper = new PluginDtoCollectionMapper(resourceLinks, pluginDtoMapper);
+    PluginDtoCollectionMapper mapper = new PluginDtoCollectionMapper(resourceLinks, pluginDtoMapper, manager);
 
     HalRepresentation result = mapper.mapInstalled(
       singletonList(createInstalledPlugin("scm-some-plugin", "1")),
@@ -93,7 +105,7 @@ class PluginDtoCollectionMapperTest {
   @Test
   void shouldNotAddInstallLinkForNewVersionWhenInstallationIsPending() {
     when(subject.isPermitted("plugin:manage")).thenReturn(true);
-    PluginDtoCollectionMapper mapper = new PluginDtoCollectionMapper(resourceLinks, pluginDtoMapper);
+    PluginDtoCollectionMapper mapper = new PluginDtoCollectionMapper(resourceLinks, pluginDtoMapper, manager);
 
     AvailablePlugin availablePlugin = createAvailablePlugin("scm-some-plugin", "2");
     when(availablePlugin.isPending()).thenReturn(true);
@@ -108,7 +120,7 @@ class PluginDtoCollectionMapperTest {
   @Test
   void shouldAddInstallLinkForNewVersionWhenPermitted() {
     when(subject.isPermitted("plugin:manage")).thenReturn(true);
-    PluginDtoCollectionMapper mapper = new PluginDtoCollectionMapper(resourceLinks, pluginDtoMapper);
+    PluginDtoCollectionMapper mapper = new PluginDtoCollectionMapper(resourceLinks, pluginDtoMapper, manager);
 
     HalRepresentation result = mapper.mapInstalled(
       singletonList(createInstalledPlugin("scm-some-plugin", "1")),
@@ -121,7 +133,7 @@ class PluginDtoCollectionMapperTest {
   @Test
   void shouldSetInstalledPluginPendingWhenCorrespondingAvailablePluginIsPending() {
     when(subject.isPermitted("plugin:manage")).thenReturn(true);
-    PluginDtoCollectionMapper mapper = new PluginDtoCollectionMapper(resourceLinks, pluginDtoMapper);
+    PluginDtoCollectionMapper mapper = new PluginDtoCollectionMapper(resourceLinks, pluginDtoMapper, manager);
 
     AvailablePlugin availablePlugin = createAvailablePlugin("scm-some-plugin", "2");
     when(availablePlugin.isPending()).thenReturn(true);