Support JSON for plugin list command

Move the plugin list command implementation to the server, so it can
be used from HTTP. Add a format option.

Signed-off-by: Brad Larson <bklarson@gmail.com>
Change-Id: Ie0621d78eb0f3f0fbd37e9fb42452f027ab7c349

gerrit-server/src/main/java/com/google/gerrit/server/plugins/ListPlugins.java

@@ -0,0 +1,107 @@
+// Copyright (C) 2012 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.server.plugins;
+
+import com.google.common.base.Strings;
+import com.google.common.collect.Lists;
+import com.google.common.collect.Maps;
+import com.google.gerrit.server.OutputFormat;
+import com.google.gson.reflect.TypeToken;
+import com.google.inject.Inject;
+
+import org.kohsuke.args4j.Option;
+
+import java.io.BufferedWriter;
+import java.io.OutputStream;
+import java.io.OutputStreamWriter;
+import java.io.PrintWriter;
+import java.io.UnsupportedEncodingException;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.List;
+import java.util.Map;
+
+/** List projects visible to the calling user. */
+public class ListPlugins {
+  private final PluginLoader pluginLoader;
+
+  @Option(name = "--format", metaVar = "FMT", usage = "Output display format")
+  private OutputFormat format = OutputFormat.TEXT;
+
+  @Inject
+  protected ListPlugins(PluginLoader pluginLoader) {
+    this.pluginLoader = pluginLoader;
+  }
+
+  public OutputFormat getFormat() {
+    return format;
+  }
+
+  public ListPlugins setFormat(OutputFormat fmt) {
+    this.format = fmt;
+    return this;
+  }
+
+  public void display(OutputStream out) {
+    final PrintWriter stdout;
+    try {
+      stdout =
+          new PrintWriter(new BufferedWriter(new OutputStreamWriter(out,
+              "UTF-8")));
+    } catch (UnsupportedEncodingException e) {
+      // Our encoding is required by the specifications for the runtime.
+      throw new RuntimeException("JVM lacks UTF-8 encoding", e);
+    }
+
+    Map<String, PluginInfo> output = Maps.newTreeMap();
+
+    List<Plugin> plugins = Lists.newArrayList(pluginLoader.getPlugins());
+    Collections.sort(plugins, new Comparator<Plugin>() {
+      @Override
+      public int compare(Plugin a, Plugin b) {
+        return a.getName().compareTo(b.getName());
+      }
+    });
+
+    if (!format.isJson()) {
+      stdout.format("%-30s %-10s\n", "Name", "Version");
+      stdout
+          .print("----------------------------------------------------------------------\n");
+    }
+
+    for (Plugin p : plugins) {
+      PluginInfo info = new PluginInfo();
+      info.version = p.getVersion();
+
+      if (format.isJson()) {
+        output.put(p.getName(), info);
+      } else {
+        stdout.format("%-30s %-10s\n", p.getName(),
+            Strings.nullToEmpty(info.version));
+      }
+    }
+
+    if (format.isJson()) {
+      format.newGson().toJson(output,
+          new TypeToken<Map<String, PluginInfo>>() {}.getType(), stdout);
+      stdout.print('\n');
+    }
+    stdout.flush();
+  }
+
+  private static class PluginInfo {
+    String version;
+  }
+}

gerrit-sshd/src/main/java/com/google/gerrit/sshd/commands/PluginLsCommand.java

@@ -14,39 +14,29 @@
 
 package com.google.gerrit.sshd.commands;
 
-import com.google.common.base.Strings;
-import com.google.common.collect.Lists;
 import com.google.gerrit.common.data.GlobalCapability;
-import com.google.gerrit.server.plugins.Plugin;
-import com.google.gerrit.server.plugins.PluginLoader;
+import com.google.gerrit.server.plugins.ListPlugins;
+import com.google.gerrit.sshd.BaseCommand;
 import com.google.gerrit.sshd.RequiresCapability;
-import com.google.gerrit.sshd.SshCommand;
 import com.google.inject.Inject;
 
-import java.util.Collections;
-import java.util.Comparator;
-import java.util.List;
+import org.apache.sshd.server.Environment;
+
+import java.io.IOException;
 
 @RequiresCapability(GlobalCapability.ADMINISTRATE_SERVER)
-final class PluginLsCommand extends SshCommand {
+final class PluginLsCommand extends BaseCommand {
   @Inject
-  private PluginLoader loader;
+  private ListPlugins impl;
 
   @Override
-  protected void run() {
-    List<Plugin> running = Lists.newArrayList(loader.getPlugins());
-    Collections.sort(running, new Comparator<Plugin>() {
+  public void start(Environment env) throws IOException {
+    startThread(new CommandRunnable() {
       @Override
-      public int compare(Plugin a, Plugin b) {
-        return a.getName().compareTo(b.getName());
+      public void run() throws Exception {
+        parseCommandLine(impl);
+        impl.display(out);
       }
     });
-
-    stdout.format("%-30s %-10s\n", "Name", "Version");
-    stdout.print("----------------------------------------------------------------------\n");
-    for (Plugin p : running) {
-      stdout.format("%-30s %-10s\n", p.getName(),
-          Strings.nullToEmpty(p.getVersion()));
-    }
   }
 }