Move handling of ListPluginsServlet to HttpPluginServlet

HttpPluginServlet already handles serving URLs in the "/plugins/*"
namespace.  It makes sense to have it also serve the "/plugings/" URL,
as we will add more actions soon, such as /plugins/?reload and
/plugins/?install.

Change-Id: Ic5eb5d9169139b8ded021a0e0f1cf421be0b2927
Signed-off-by: Brad Larson <bklarson@gmail.com>

gerrit-httpd/src/main/java/com/google/gerrit/httpd/UrlModule.java

diff --git a/gerrit-httpd/src/main/java/com/google/gerrit/httpd/UrlModule.java b/gerrit-httpd/src/main/java/com/google/gerrit/httpd/UrlModule.java
index a712f9b..9e69946 100644
--- a/gerrit-httpd/src/main/java/com/google/gerrit/httpd/UrlModule.java
+++ b/gerrit-httpd/src/main/java/com/google/gerrit/httpd/UrlModule.java
@@ -26,7 +26,6 @@
 import com.google.gerrit.httpd.rpc.account.AccountCapabilitiesServlet;
 import com.google.gerrit.httpd.rpc.change.DeprecatedChangeQueryServlet;
 import com.google.gerrit.httpd.rpc.change.ListChangesServlet;
-import com.google.gerrit.httpd.rpc.plugin.ListPluginsServlet;
 import com.google.gerrit.httpd.rpc.project.ListProjectsServlet;
 import com.google.gerrit.reviewdb.client.Change;
 import com.google.gerrit.reviewdb.client.Project;
@@ -96,7 +95,6 @@
     filter("/a/*").through(RequireIdentifiedUserFilter.class);
     serveRegex("^/(?:a/)?accounts/self/capabilities$").with(AccountCapabilitiesServlet.class);
     serveRegex("^/(?:a/)?changes/$").with(ListChangesServlet.class);
-    serveRegex("^/(?:a/)?plugins/$").with(ListPluginsServlet.class);
     serveRegex("^/(?:a/)?projects/(.*)?$").with(ListProjectsServlet.class);
 
     if (cfg.deprecatedQuery) {

gerrit-httpd/src/main/java/com/google/gerrit/httpd/plugins/HttpPluginServlet.java

diff --git a/gerrit-httpd/src/main/java/com/google/gerrit/httpd/plugins/HttpPluginServlet.java b/gerrit-httpd/src/main/java/com/google/gerrit/httpd/plugins/HttpPluginServlet.java
index 47eae99..e737700 100644
--- a/gerrit-httpd/src/main/java/com/google/gerrit/httpd/plugins/HttpPluginServlet.java
+++ b/gerrit-httpd/src/main/java/com/google/gerrit/httpd/plugins/HttpPluginServlet.java
@@ -19,6 +19,7 @@
 import com.google.common.collect.Lists;
 import com.google.common.collect.Maps;
 import com.google.gerrit.extensions.registration.RegistrationHandle;
+import com.google.gerrit.httpd.rpc.plugin.ListPluginsServlet;
 import com.google.gerrit.server.MimeUtilFileTypeRegistry;
 import com.google.gerrit.server.config.CanonicalWebUrl;
 import com.google.gerrit.server.config.GerritServerConfig;
@@ -79,6 +80,7 @@
   private final Cache<ResourceKey, Resource> resourceCache;
   private final String sshHost;
   private final int sshPort;
+  private final ListPluginsServlet listServlet;
 
   private List<Plugin> pending = Lists.newArrayList();
   private String base;
@@ -90,10 +92,11 @@
       @CanonicalWebUrl Provider<String> webUrl,
       @Named(HttpPluginModule.PLUGIN_RESOURCES) Cache<ResourceKey, Resource> cache,
       @GerritServerConfig Config cfg,
-      SshInfo sshInfo) {
+      SshInfo sshInfo, ListPluginsServlet listServlet) {
     this.mimeUtil = mimeUtil;
     this.webUrl = webUrl;
     this.resourceCache = cache;
+    this.listServlet = listServlet;
 
     String sshHost = "review.example.com";
     int sshPort = 29418;
@@ -185,6 +188,10 @@
   public void service(HttpServletRequest req, HttpServletResponse res)
       throws IOException, ServletException {
     String name = extractName(req);
+    if (name.equals("")) {
+      listServlet.service(req, res);
+      return;
+    }
     final PluginHolder holder = plugins.get(name);
     if (holder == null) {
       noCache(res);