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.gerrit.extensions.restapi.AuthException;
      18             : import com.google.gerrit.extensions.restapi.ResourceNotFoundException;
      19             : import com.google.gerrit.extensions.restapi.Response;
      20             : import com.google.gerrit.extensions.restapi.RestReadView;
      21             : import com.google.gerrit.server.git.GitRepositoryManager;
      22             : import com.google.gerrit.server.permissions.PermissionBackend;
      23             : import com.google.gerrit.server.permissions.PermissionBackendException;
      24             : import com.google.gerrit.server.permissions.ProjectPermission;
      25             : import com.google.gerrit.server.permissions.RefPermission;
      26             : import com.google.gerrit.server.project.ProjectResource;
      27             : import com.google.inject.Inject;
      28             : import com.google.inject.Singleton;
      29             : import java.io.IOException;
      30             : import org.eclipse.jgit.errors.IncorrectObjectTypeException;
      31             : import org.eclipse.jgit.errors.MissingObjectException;
      32             : import org.eclipse.jgit.errors.RepositoryNotFoundException;
      33             : import org.eclipse.jgit.lib.Constants;
      34             : import org.eclipse.jgit.lib.Ref;
      35             : import org.eclipse.jgit.lib.Repository;
      36             : import org.eclipse.jgit.revwalk.RevCommit;
      37             : import org.eclipse.jgit.revwalk.RevWalk;
      38             : 
      39             : @Singleton
      40             : public class GetHead implements RestReadView<ProjectResource> {
      41             :   private final GitRepositoryManager repoManager;
      42             :   private final CommitsCollection commits;
      43             :   private final PermissionBackend permissionBackend;
      44             : 
      45             :   @Inject
      46             :   GetHead(
      47             :       GitRepositoryManager repoManager,
      48             :       CommitsCollection commits,
      49         146 :       PermissionBackend permissionBackend) {
      50         146 :     this.repoManager = repoManager;
      51         146 :     this.commits = commits;
      52         146 :     this.permissionBackend = permissionBackend;
      53         146 :   }
      54             : 
      55             :   @Override
      56             :   public Response<String> apply(ProjectResource rsrc)
      57             :       throws AuthException, ResourceNotFoundException, IOException, PermissionBackendException {
      58           3 :     rsrc.getProjectState().statePermitsRead();
      59           3 :     try (Repository repo = repoManager.openRepository(rsrc.getNameKey())) {
      60           3 :       Ref head = repo.getRefDatabase().exactRef(Constants.HEAD);
      61           3 :       if (head == null) {
      62           0 :         throw new ResourceNotFoundException(Constants.HEAD);
      63           3 :       } else if (head.isSymbolic()) {
      64           3 :         String n = head.getTarget().getName();
      65           3 :         permissionBackend
      66           3 :             .user(rsrc.getUser())
      67           3 :             .project(rsrc.getNameKey())
      68           3 :             .ref(n)
      69           3 :             .check(RefPermission.READ);
      70           3 :         return Response.ok(n);
      71           0 :       } else if (head.getObjectId() != null) {
      72           0 :         try (RevWalk rw = new RevWalk(repo)) {
      73           0 :           RevCommit commit = rw.parseCommit(head.getObjectId());
      74           0 :           if (commits.canRead(rsrc.getProjectState(), repo, commit)) {
      75           0 :             return Response.ok(head.getObjectId().name());
      76             :           }
      77           0 :           throw new AuthException("not allowed to see HEAD");
      78           0 :         } catch (MissingObjectException | IncorrectObjectTypeException e) {
      79             :           try {
      80           0 :             permissionBackend
      81           0 :                 .user(rsrc.getUser())
      82           0 :                 .project(rsrc.getNameKey())
      83           0 :                 .check(ProjectPermission.WRITE_CONFIG);
      84           0 :           } catch (AuthException ae) {
      85           0 :             throw new AuthException("not allowed to see HEAD", ae);
      86           0 :           }
      87             :         }
      88             :       }
      89           0 :       throw new ResourceNotFoundException(Constants.HEAD);
      90           3 :     } catch (RepositoryNotFoundException e) {
      91           0 :       throw new ResourceNotFoundException(rsrc.getName(), e);
      92             :     }
      93             :   }
      94             : }