Line data    Source code

       1             : // Copyright (C) 2013 The Android Open Source Project
       2             : //
       3             : // Licensed under the Apache License, Version 2.0 (the "License");
       4             : // you may not use this file except in compliance with the License.
       5             : // You may obtain a copy of the License at
       6             : //
       7             : // http://www.apache.org/licenses/LICENSE-2.0
       8             : //
       9             : // Unless required by applicable law or agreed to in writing, software
      10             : // distributed under the License is distributed on an "AS IS" BASIS,
      11             : // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
      12             : // See the License for the specific language governing permissions and
      13             : // limitations under the License.
      14             : 
      15             : package com.google.gerrit.server.restapi.project;
      16             : 
      17             : import com.google.common.base.Strings;
      18             : import com.google.gerrit.entities.Project;
      19             : import com.google.gerrit.entities.RefNames;
      20             : import com.google.gerrit.extensions.api.projects.HeadInput;
      21             : import com.google.gerrit.extensions.events.HeadUpdatedListener;
      22             : import com.google.gerrit.extensions.restapi.AuthException;
      23             : import com.google.gerrit.extensions.restapi.BadRequestException;
      24             : import com.google.gerrit.extensions.restapi.ResourceNotFoundException;
      25             : import com.google.gerrit.extensions.restapi.Response;
      26             : import com.google.gerrit.extensions.restapi.RestModifyView;
      27             : import com.google.gerrit.extensions.restapi.UnprocessableEntityException;
      28             : import com.google.gerrit.git.LockFailureException;
      29             : import com.google.gerrit.server.IdentifiedUser;
      30             : import com.google.gerrit.server.extensions.events.AbstractNoNotifyEvent;
      31             : import com.google.gerrit.server.git.GitRepositoryManager;
      32             : import com.google.gerrit.server.permissions.PermissionBackend;
      33             : import com.google.gerrit.server.permissions.PermissionBackendException;
      34             : import com.google.gerrit.server.permissions.RefPermission;
      35             : import com.google.gerrit.server.plugincontext.PluginSetContext;
      36             : import com.google.gerrit.server.project.ProjectResource;
      37             : import com.google.inject.Inject;
      38             : import com.google.inject.Provider;
      39             : import com.google.inject.Singleton;
      40             : import java.io.IOException;
      41             : import java.util.Map;
      42             : import org.eclipse.jgit.errors.RepositoryNotFoundException;
      43             : import org.eclipse.jgit.lib.Constants;
      44             : import org.eclipse.jgit.lib.Ref;
      45             : import org.eclipse.jgit.lib.RefUpdate;
      46             : import org.eclipse.jgit.lib.Repository;
      47             : 
      48             : @Singleton
      49             : public class SetHead implements RestModifyView<ProjectResource, HeadInput> {
      50             :   private final GitRepositoryManager repoManager;
      51             :   private final Provider<IdentifiedUser> identifiedUser;
      52             :   private final PluginSetContext<HeadUpdatedListener> headUpdatedListeners;
      53             :   private final PermissionBackend permissionBackend;
      54             : 
      55             :   @Inject
      56             :   SetHead(
      57             :       GitRepositoryManager repoManager,
      58             :       Provider<IdentifiedUser> identifiedUser,
      59             :       PluginSetContext<HeadUpdatedListener> headUpdatedListeners,
      60         146 :       PermissionBackend permissionBackend) {
      61         146 :     this.repoManager = repoManager;
      62         146 :     this.identifiedUser = identifiedUser;
      63         146 :     this.headUpdatedListeners = headUpdatedListeners;
      64         146 :     this.permissionBackend = permissionBackend;
      65         146 :   }
      66             : 
      67             :   @Override
      68             :   public Response<String> apply(ProjectResource rsrc, HeadInput input)
      69             :       throws AuthException, ResourceNotFoundException, BadRequestException,
      70             :           UnprocessableEntityException, IOException, PermissionBackendException {
      71           2 :     if (input == null || Strings.isNullOrEmpty(input.ref)) {
      72           1 :       throw new BadRequestException("ref required");
      73             :     }
      74           1 :     String ref = RefNames.fullName(input.ref);
      75             : 
      76           1 :     permissionBackend
      77           1 :         .user(rsrc.getUser())
      78           1 :         .project(rsrc.getNameKey())
      79           1 :         .ref(ref)
      80           1 :         .check(RefPermission.SET_HEAD);
      81             : 
      82           1 :     try (Repository repo = repoManager.openRepository(rsrc.getNameKey())) {
      83           1 :       Map<String, Ref> cur = repo.getRefDatabase().exactRef(Constants.HEAD, ref);
      84           1 :       if (!cur.containsKey(ref)) {
      85           1 :         throw new UnprocessableEntityException(String.format("Ref Not Found: %s", ref));
      86             :       }
      87             : 
      88           1 :       final String oldHead = cur.get(Constants.HEAD).getTarget().getName();
      89           1 :       final String newHead = ref;
      90           1 :       if (!oldHead.equals(newHead)) {
      91           1 :         final RefUpdate u = repo.updateRef(Constants.HEAD, true);
      92           1 :         u.setRefLogIdent(identifiedUser.get().newRefLogIdent());
      93           1 :         RefUpdate.Result res = u.link(newHead);
      94           1 :         switch (res) {
      95             :           case NO_CHANGE:
      96             :           case RENAMED:
      97             :           case FORCED:
      98             :           case NEW:
      99           1 :             break;
     100             :           case LOCK_FAILURE:
     101           0 :             throw new LockFailureException("Setting HEAD failed", u);
     102             :           case FAST_FORWARD:
     103             :           case IO_FAILURE:
     104             :           case NOT_ATTEMPTED:
     105             :           case REJECTED:
     106             :           case REJECTED_CURRENT_BRANCH:
     107             :           case REJECTED_MISSING_OBJECT:
     108             :           case REJECTED_OTHER_REASON:
     109             :           default:
     110           0 :             throw new IOException("Setting HEAD failed with " + res);
     111             :         }
     112             : 
     113           1 :         fire(rsrc.getNameKey(), oldHead, newHead);
     114             :       }
     115           1 :       return Response.ok(ref);
     116           0 :     } catch (RepositoryNotFoundException e) {
     117           0 :       throw new ResourceNotFoundException(rsrc.getName(), e);
     118             :     }
     119             :   }
     120             : 
     121             :   private void fire(Project.NameKey nameKey, String oldHead, String newHead) {
     122           1 :     if (headUpdatedListeners.isEmpty()) {
     123           0 :       return;
     124             :     }
     125             : 
     126           1 :     Event event = new Event(nameKey, oldHead, newHead);
     127           1 :     headUpdatedListeners.runEach(l -> l.onHeadUpdated(event));
     128           1 :   }
     129             : 
     130             :   static class Event extends AbstractNoNotifyEvent implements HeadUpdatedListener.Event {
     131             :     private final Project.NameKey nameKey;
     132             :     private final String oldHead;
     133             :     private final String newHead;
     134             : 
     135           1 :     Event(Project.NameKey nameKey, String oldHead, String newHead) {
     136           1 :       this.nameKey = nameKey;
     137           1 :       this.oldHead = oldHead;
     138           1 :       this.newHead = newHead;
     139           1 :     }
     140             : 
     141             :     @Override
     142             :     public String getProjectName() {
     143           1 :       return nameKey.get();
     144             :     }
     145             : 
     146             :     @Override
     147             :     public String getOldHeadName() {
     148           1 :       return oldHead;
     149             :     }
     150             : 
     151             :     @Override
     152             :     public String getNewHeadName() {
     153           1 :       return newHead;
     154             :     }
     155             :   }
     156             : }