1 files changed, 141 insertions, 0 deletions
diff --git a/java/com/google/gerrit/server/restapi/change/CherryPick.java b/java/com/google/gerrit/server/restapi/change/CherryPick.java
new file mode 100644
index 0000000000..b68122e6f5
--- /dev/null
+++ b/java/com/google/gerrit/server/restapi/change/CherryPick.java
@@ -0,0 +1,141 @@
+// 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.restapi.change;
+
+import static com.google.gerrit.extensions.conditions.BooleanCondition.and;
+
+import com.google.common.flogger.FluentLogger;
+import com.google.gerrit.extensions.api.changes.CherryPickInput;
+import com.google.gerrit.extensions.common.CherryPickChangeInfo;
+import com.google.gerrit.extensions.restapi.BadRequestException;
+import com.google.gerrit.extensions.restapi.ResourceConflictException;
+import com.google.gerrit.extensions.restapi.RestApiException;
+import com.google.gerrit.extensions.webui.UiAction;
+import com.google.gerrit.reviewdb.client.Branch;
+import com.google.gerrit.reviewdb.client.RefNames;
+import com.google.gerrit.server.change.ChangeJson;
+import com.google.gerrit.server.change.RevisionResource;
+import com.google.gerrit.server.permissions.PermissionBackend;
+import com.google.gerrit.server.permissions.PermissionBackendException;
+import com.google.gerrit.server.permissions.ProjectPermission;
+import com.google.gerrit.server.permissions.RefPermission;
+import com.google.gerrit.server.project.ContributorAgreementsChecker;
+import com.google.gerrit.server.project.InvalidChangeOperationException;
+import com.google.gerrit.server.project.NoSuchChangeException;
+import com.google.gerrit.server.project.NoSuchProjectException;
+import com.google.gerrit.server.project.ProjectCache;
+import com.google.gerrit.server.submit.IntegrationException;
+import com.google.gerrit.server.update.BatchUpdate;
+import com.google.gerrit.server.update.RetryHelper;
+import com.google.gerrit.server.update.RetryingRestModifyView;
+import com.google.gerrit.server.update.UpdateException;
+import com.google.gwtorm.server.OrmException;
+import com.google.inject.Inject;
+import com.google.inject.Singleton;
+import java.io.IOException;
+import org.eclipse.jgit.errors.ConfigInvalidException;
+
+@Singleton
+public class CherryPick
+    extends RetryingRestModifyView<RevisionResource, CherryPickInput, CherryPickChangeInfo>
+    implements UiAction<RevisionResource> {
+  private static final FluentLogger logger = FluentLogger.forEnclosingClass();
+
+  private final PermissionBackend permissionBackend;
+  private final CherryPickChange cherryPickChange;
+  private final ChangeJson.Factory json;
+  private final ContributorAgreementsChecker contributorAgreements;
+  private final ProjectCache projectCache;
+
+  @Inject
+  CherryPick(
+      PermissionBackend permissionBackend,
+      RetryHelper retryHelper,
+      CherryPickChange cherryPickChange,
+      ChangeJson.Factory json,
+      ContributorAgreementsChecker contributorAgreements,
+      ProjectCache projectCache) {
+    super(retryHelper);
+    this.permissionBackend = permissionBackend;
+    this.cherryPickChange = cherryPickChange;
+    this.json = json;
+    this.contributorAgreements = contributorAgreements;
+    this.projectCache = projectCache;
+  }
+
+  @Override
+  public CherryPickChangeInfo applyImpl(
+      BatchUpdate.Factory updateFactory, RevisionResource rsrc, CherryPickInput input)
+      throws OrmException, IOException, UpdateException, RestApiException,
+          PermissionBackendException, ConfigInvalidException, NoSuchProjectException {
+    input.parent = input.parent == null ? 1 : input.parent;
+    if (input.message == null || input.message.trim().isEmpty()) {
+      throw new BadRequestException("message must be non-empty");
+    } else if (input.destination == null || input.destination.trim().isEmpty()) {
+      throw new BadRequestException("destination must be non-empty");
+    }
+
+    String refName = RefNames.fullName(input.destination);
+    contributorAgreements.check(rsrc.getProject(), rsrc.getUser());
+
+    permissionBackend
+        .currentUser()
+        .project(rsrc.getChange().getProject())
+        .ref(refName)
+        .check(RefPermission.CREATE_CHANGE);
+    projectCache.checkedGet(rsrc.getProject()).checkStatePermitsWrite();
+
+    try {
+      CherryPickChange.Result cherryPickResult =
+          cherryPickChange.cherryPick(
+              updateFactory,
+              rsrc.getChange(),
+              rsrc.getPatchSet(),
+              input,
+              new Branch.NameKey(rsrc.getProject(), refName));
+      CherryPickChangeInfo changeInfo =
+          json.noOptions()
+              .format(rsrc.getProject(), cherryPickResult.changeId(), CherryPickChangeInfo::new);
+      changeInfo.containsGitConflicts =
+          !cherryPickResult.filesWithGitConflicts().isEmpty() ? true : null;
+      return changeInfo;
+    } catch (InvalidChangeOperationException e) {
+      throw new BadRequestException(e.getMessage());
+    } catch (IntegrationException | NoSuchChangeException e) {
+      throw new ResourceConflictException(e.getMessage());
+    }
+  }
+
+  @Override
+  public UiAction.Description getDescription(RevisionResource rsrc) {
+    boolean projectStatePermitsWrite = false;
+    try {
+      projectStatePermitsWrite = projectCache.checkedGet(rsrc.getProject()).statePermitsWrite();
+    } catch (IOException e) {
+      logger.atSevere().withCause(e).log(
+          "Failed to check if project state permits write: %s", rsrc.getProject());
+    }
+    return new UiAction.Description()
+        .setLabel("Cherry Pick")
+        .setTitle("Cherry pick change to a different branch")
+        .setVisible(
+            and(
+                rsrc.isCurrent() && projectStatePermitsWrite,
+                permissionBackend
+                    .currentUser()
+                    .project(rsrc.getProject())
+                    .testCond(ProjectPermission.CREATE_CHANGE)));
+  }
+}