implemented ui for pending plugin installation

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

@@ -95,4 +95,16 @@ public class AvailablePluginResource {
     pluginManager.install(name, restartAfterInstallation);
     return Response.ok().build();
   }
+
+  @POST
+  @Path("/install-pending")
+  @StatusCodes({
+    @ResponseCode(code = 200, condition = "success"),
+    @ResponseCode(code = 500, condition = "internal server error")
+  })
+  public Response installPending() {
+    PluginPermissions.manage().check();
+    pluginManager.installPendingAndRestart();
+    return Response.ok().build();
+  }
 }

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

@@ -3,9 +3,11 @@ 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 java.util.List;
 
@@ -31,7 +33,7 @@ public class PluginDtoCollectionMapper {
 
   public HalRepresentation mapAvailable(List<AvailablePlugin> plugins) {
     List<PluginDto> dtos = plugins.stream().map(mapper::mapAvailable).collect(toList());
-    return new HalRepresentation(createAvailablePluginsLinks(), embedDtos(dtos));
+    return new HalRepresentation(createAvailablePluginsLinks(plugins), embedDtos(dtos));
   }
 
   private Links createInstalledPluginsLinks() {
@@ -42,14 +44,25 @@ public class PluginDtoCollectionMapper {
     return linksBuilder.build();
   }
 
-  private Links createAvailablePluginsLinks() {
+  private Links createAvailablePluginsLinks(List<AvailablePlugin> plugins) {
     String baseUrl = resourceLinks.availablePluginCollection().self();
 
     Links.Builder linksBuilder = linkingTo()
       .with(Links.linkingTo().self(baseUrl).build());
+
+    if (PluginPermissions.manage().isPermitted()) {
+      if (containsPending(plugins)) {
+        linksBuilder.single(Link.link("installPending", resourceLinks.availablePluginCollection().installPending()));
+      }
+    }
+
     return linksBuilder.build();
   }
 
+  private boolean containsPending(List<AvailablePlugin> plugins) {
+    return plugins.stream().anyMatch(AvailablePlugin::isPending);
+  }
+
   private Embedded embedDtos(List<PluginDto> dtos) {
     return embeddedBuilder()
       .with("plugins", dtos)

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

@@ -715,6 +715,10 @@ class ResourceLinks {
       availablePluginCollectionLinkBuilder = new LinkBuilder(pathInfo, PluginRootResource.class, AvailablePluginResource.class);
     }
 
+    String installPending() {
+      return availablePluginCollectionLinkBuilder.method("availablePlugins").parameters().method("installPending").parameters().href();
+    }
+
     String self() {
       return availablePluginCollectionLinkBuilder.method("availablePlugins").parameters().method("getAvailablePlugins").parameters().href();
     }