InlineEdit: Add DELETE /changes/<id>/edit/path%2fto%2ffile REST endpoint

Allow to delete file from change edit.

Change-Id: I62ea1f3df02a2872ed51456f44fa961dfe518b37

Documentation/rest-api-changes.txt

@@ -1247,6 +1247,28 @@ response "`204 No Content`" is returned.
   HTTP/1.1 204 No Content
 ----
 
+[[delete-edit-file]]
+=== Delete file in Change Edit
+--
+'DELETE /changes/link:#change-id[\{change-id\}]/edit/path%2fto%2ffile'
+--
+
+Deletes a file from a change edit. This deletes the file from the repository
+completely. This is not the same as reverting or restoring a file to its
+previous contents.
+
+.Request
+----
+  DELETE /changes/myProject~master~I8473b95934b5732ac55d26311a706c9c2bde9940/edit/foo HTTP/1.0
+----
+
+When change edit doesn't exist for this change yet it is created.
+
+.Response
+----
+  HTTP/1.1 204 No Content
+----
+
 [[reviewer-endpoints]]
 == Reviewer Endpoints
 

gerrit-acceptance-tests/src/test/java/com/google/gerrit/acceptance/edit/ChangeEditIT.java

@@ -262,6 +262,22 @@ public class ChangeEditIT extends AbstractDaemonTest {
     }
   }
 
+  @Test
+  public void deleteExistingFileRest() throws Exception {
+    assertEquals(RefUpdate.Result.NEW,
+        modifier.createEdit(
+            change,
+            ps));
+    assertEquals(SC_NO_CONTENT, session.delete(urlEditFile()).getStatusCode());
+    Optional<ChangeEdit> edit = editUtil.byChange(change);
+    try {
+      fileUtil.getContent(edit.get().getChange().getProject(),
+          edit.get().getRevision().get(), FILE_NAME);
+      fail("ResourceNotFoundException expected");
+    } catch (ResourceNotFoundException rnfe) {
+    }
+  }
+
   @Test
   public void restoreDeletedFileInEdit() throws Exception {
     assertEquals(RefUpdate.Result.NEW,

gerrit-server/src/main/java/com/google/gerrit/server/change/ChangeEdits.java

@@ -23,7 +23,6 @@ import com.google.gerrit.extensions.registration.DynamicMap;
 import com.google.gerrit.extensions.restapi.AcceptsCreate;
 import com.google.gerrit.extensions.restapi.AcceptsPost;
 import com.google.gerrit.extensions.restapi.AuthException;
-import com.google.gerrit.extensions.restapi.BadRequestException;
 import com.google.gerrit.extensions.restapi.ChildCollection;
 import com.google.gerrit.extensions.restapi.DefaultInput;
 import com.google.gerrit.extensions.restapi.IdString;
@@ -280,4 +279,35 @@ public class ChangeEdits implements
       return Response.none();
     }
   }
+
+  /**
+   * Handler to delete a file.
+   * <p>
+   * This deletes the file from the repository completely. This is not the same
+   * as reverting or restoring a file to its previous contents.
+   */
+  @Singleton
+  static class DeleteContent implements
+      RestModifyView<ChangeEditResource, DeleteContent.Input> {
+    public static class Input {
+    }
+
+    private final ChangeEditModifier editModifier;
+
+    @Inject
+    DeleteContent(ChangeEditModifier editModifier) {
+      this.editModifier = editModifier;
+    }
+
+    @Override
+    public Response<?> apply(ChangeEditResource rsrc, DeleteContent.Input input)
+        throws AuthException, ResourceConflictException {
+      try {
+        editModifier.deleteFile(rsrc.getChangeEdit(), rsrc.getPath());
+      } catch(InvalidChangeOperationException | IOException e) {
+        throw new ResourceConflictException(e.getMessage());
+      }
+      return Response.none();
+    }
+  }
 }

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

@@ -103,6 +103,7 @@ public class Module extends RestApiModule {
 
     child(CHANGE_KIND, "edit").to(ChangeEdits.class);
     put(CHANGE_EDIT_KIND, "/").to(ChangeEdits.Put.class);
+    delete(CHANGE_EDIT_KIND).to(ChangeEdits.DeleteContent.class);
 
     install(new FactoryModule() {
       @Override