Add REST endpoint to ban commits

Change-Id: I941f76be00b9bce7f6f6f26925a82efe76fa42b5
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>

gerrit-server/src/main/java/com/google/gerrit/server/project/BanCommit.java

@@ -0,0 +1,106 @@
+// Copyright (C) 2014 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.project;
+
+import com.google.common.base.Function;
+import com.google.common.collect.Lists;
+import com.google.gerrit.common.errors.PermissionDeniedException;
+import com.google.gerrit.extensions.restapi.AuthException;
+import com.google.gerrit.extensions.restapi.ResourceConflictException;
+import com.google.gerrit.extensions.restapi.RestModifyView;
+import com.google.gerrit.extensions.restapi.UnprocessableEntityException;
+import com.google.gerrit.server.git.BanCommitResult;
+import com.google.gerrit.server.git.MergeException;
+import com.google.gerrit.server.project.BanCommit.Input;
+import com.google.inject.Inject;
+import com.google.inject.Singleton;
+
+import org.eclipse.jgit.api.errors.ConcurrentRefUpdateException;
+import org.eclipse.jgit.lib.ObjectId;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+@Singleton
+public class BanCommit implements RestModifyView<ProjectResource, Input> {
+  public static class Input {
+    public List<String> commits;
+    public String reason;
+
+    public static Input fromCommits(String firstCommit, String... moreCommits) {
+      return fromCommits(Lists.asList(firstCommit, moreCommits));
+    }
+
+    public static Input fromCommits(List<String> commits) {
+      Input in = new Input();
+      in.commits = commits;
+      return in;
+    }
+  }
+
+  @Inject
+  private com.google.gerrit.server.git.BanCommit banCommit;
+
+  @Override
+  public BanResultInfo apply(ProjectResource rsrc, Input input)
+      throws UnprocessableEntityException, AuthException,
+      ResourceConflictException, IOException, InterruptedException {
+    BanResultInfo r = new BanResultInfo();
+    if (input != null && input.commits != null && !input.commits.isEmpty()) {
+      List<ObjectId> commitsToBan = new ArrayList<>(input.commits.size());
+      for (String c : input.commits) {
+        try {
+          commitsToBan.add(ObjectId.fromString(c));
+        } catch (IllegalArgumentException e) {
+          throw new UnprocessableEntityException(e.getMessage());
+        }
+      }
+
+      try {
+        BanCommitResult result =
+            banCommit.ban(rsrc.getControl(), commitsToBan, input.reason);
+        r.newlyBanned = transformCommits(result.getNewlyBannedCommits());
+        r.alreadyBanned = transformCommits(result.getAlreadyBannedCommits());
+        r.ignored = transformCommits(result.getIgnoredObjectIds());
+      } catch (PermissionDeniedException e) {
+        throw new AuthException(e.getMessage());
+      } catch (MergeException | ConcurrentRefUpdateException e) {
+        throw new ResourceConflictException(e.getMessage(), e);
+      }
+    }
+    return r;
+  }
+
+  private static List<String> transformCommits(List<ObjectId> commits) {
+    if (commits == null || commits.isEmpty()) {
+      return null;
+    }
+
+    return Lists.transform(commits,
+        new Function<ObjectId, String>() {
+          @Override
+          public String apply(ObjectId id) {
+            return id.getName();
+          }
+        });
+  }
+
+  public static class BanResultInfo {
+    public List<String> newlyBanned;
+    public List<String> alreadyBanned;
+    public List<String> ignored;
+  }
+}

gerrit-server/src/main/java/com/google/gerrit/server/project/Module.java

@@ -53,6 +53,8 @@ public class Module extends RestApiModule {
     get(PROJECT_KIND, "HEAD").to(GetHead.class);
     put(PROJECT_KIND, "HEAD").to(SetHead.class);
 
+    put(PROJECT_KIND, "ban").to(BanCommit.class);
+
     get(PROJECT_KIND, "statistics.git").to(GetStatistics.class);
     post(PROJECT_KIND, "gc").to(GarbageCollect.class);