1 files changed, 149 insertions, 0 deletions
diff --git a/java/com/google/gerrit/server/restapi/change/ChangesCollection.java b/java/com/google/gerrit/server/restapi/change/ChangesCollection.java
new file mode 100644
index 0000000000..561c27c306
--- /dev/null
+++ b/java/com/google/gerrit/server/restapi/change/ChangesCollection.java
@@ -0,0 +1,149 @@
+// 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 com.google.gerrit.extensions.registration.DynamicMap;
+import com.google.gerrit.extensions.restapi.AuthException;
+import com.google.gerrit.extensions.restapi.IdString;
+import com.google.gerrit.extensions.restapi.ResourceNotFoundException;
+import com.google.gerrit.extensions.restapi.RestApiException;
+import com.google.gerrit.extensions.restapi.RestCollection;
+import com.google.gerrit.extensions.restapi.RestView;
+import com.google.gerrit.extensions.restapi.TopLevelResource;
+import com.google.gerrit.reviewdb.client.Change;
+import com.google.gerrit.reviewdb.client.Project;
+import com.google.gerrit.reviewdb.server.ReviewDb;
+import com.google.gerrit.server.CurrentUser;
+import com.google.gerrit.server.change.ChangeFinder;
+import com.google.gerrit.server.change.ChangeResource;
+import com.google.gerrit.server.notedb.ChangeNotes;
+import com.google.gerrit.server.permissions.ChangePermission;
+import com.google.gerrit.server.permissions.PermissionBackend;
+import com.google.gerrit.server.permissions.PermissionBackendException;
+import com.google.gerrit.server.project.ProjectCache;
+import com.google.gerrit.server.project.ProjectState;
+import com.google.gwtorm.server.OrmException;
+import com.google.inject.Inject;
+import com.google.inject.Provider;
+import com.google.inject.Singleton;
+import java.io.IOException;
+import java.util.List;
+
+@Singleton
+public class ChangesCollection implements RestCollection<TopLevelResource, ChangeResource> {
+  private final Provider<ReviewDb> db;
+  private final Provider<CurrentUser> user;
+  private final Provider<QueryChanges> queryFactory;
+  private final DynamicMap<RestView<ChangeResource>> views;
+  private final ChangeFinder changeFinder;
+  private final ChangeResource.Factory changeResourceFactory;
+  private final PermissionBackend permissionBackend;
+  private final ProjectCache projectCache;
+
+  @Inject
+  public ChangesCollection(
+      Provider<ReviewDb> db,
+      Provider<CurrentUser> user,
+      Provider<QueryChanges> queryFactory,
+      DynamicMap<RestView<ChangeResource>> views,
+      ChangeFinder changeFinder,
+      ChangeResource.Factory changeResourceFactory,
+      PermissionBackend permissionBackend,
+      ProjectCache projectCache) {
+    this.db = db;
+    this.user = user;
+    this.queryFactory = queryFactory;
+    this.views = views;
+    this.changeFinder = changeFinder;
+    this.changeResourceFactory = changeResourceFactory;
+    this.permissionBackend = permissionBackend;
+    this.projectCache = projectCache;
+  }
+
+  @Override
+  public QueryChanges list() {
+    return queryFactory.get();
+  }
+
+  @Override
+  public DynamicMap<RestView<ChangeResource>> views() {
+    return views;
+  }
+
+  @Override
+  public ChangeResource parse(TopLevelResource root, IdString id)
+      throws RestApiException, OrmException, PermissionBackendException, IOException {
+    List<ChangeNotes> notes = changeFinder.find(id.encoded(), true);
+    if (notes.isEmpty()) {
+      throw new ResourceNotFoundException(id);
+    } else if (notes.size() != 1) {
+      throw new ResourceNotFoundException("Multiple changes found for " + id);
+    }
+
+    ChangeNotes change = notes.get(0);
+    if (!canRead(change)) {
+      throw new ResourceNotFoundException(id);
+    }
+    checkProjectStatePermitsRead(change.getProjectName());
+    return changeResourceFactory.create(change, user.get());
+  }
+
+  public ChangeResource parse(Change.Id id)
+      throws RestApiException, OrmException, PermissionBackendException, IOException {
+    List<ChangeNotes> notes = changeFinder.find(id);
+    if (notes.isEmpty()) {
+      throw new ResourceNotFoundException(toIdString(id));
+    } else if (notes.size() != 1) {
+      throw new ResourceNotFoundException("Multiple changes found for " + id);
+    }
+
+    ChangeNotes change = notes.get(0);
+    if (!canRead(change)) {
+      throw new ResourceNotFoundException(toIdString(id));
+    }
+    checkProjectStatePermitsRead(change.getProjectName());
+    return changeResourceFactory.create(change, user.get());
+  }
+
+  private static IdString toIdString(Change.Id id) {
+    return IdString.fromDecoded(id.toString());
+  }
+
+  public ChangeResource parse(ChangeNotes notes, CurrentUser user) {
+    return changeResourceFactory.create(notes, user);
+  }
+
+  private boolean canRead(ChangeNotes notes) throws PermissionBackendException, IOException {
+    try {
+      permissionBackend.currentUser().change(notes).database(db).check(ChangePermission.READ);
+    } catch (AuthException e) {
+      return false;
+    }
+    ProjectState projectState = projectCache.checkedGet(notes.getProjectName());
+    if (projectState == null) {
+      return false;
+    }
+    return projectState.statePermitsRead();
+  }
+
+  private void checkProjectStatePermitsRead(Project.NameKey project)
+      throws IOException, RestApiException {
+    ProjectState projectState = projectCache.checkedGet(project);
+    if (projectState == null) {
+      throw new ResourceNotFoundException("project not found: " + project.get());
+    }
+    projectState.checkStatePermitsRead();
+  }
+}