Implementation of File Exists Function; Delete FileInfos upon Permanent User Delete (#8958)

Check if file was deleted on FS

Warning message if file couldnt be removed

app/file.go

@@ -70,6 +70,14 @@ func (a *App) ReadFile(path string) ([]byte, *model.AppError) {
 	return backend.ReadFile(path)
 }
 
+func (a *App) FileExists(path string) (bool, *model.AppError) {
+	backend, err := a.FileBackend()
+	if err != nil {
+		return false, err
+	}
+	return backend.FileExists(path)
+}
+
 func (a *App) MoveFile(oldPath, newPath string) *model.AppError {
 	backend, err := a.FileBackend()
 	if err != nil {

app/user.go

@@ -1288,6 +1288,33 @@ func (a *App) PermanentDeleteUser(user *model.User) *model.AppError {
 		return result.Err
 	}
 
+	fchan := a.Srv.Store.FileInfo().GetForUser(user.Id)
+	var infos []*model.FileInfo
+	if result := <-fchan; result.Err != nil {
+		mlog.Warn("Error getting file list for user from FileInfoStore")
+	} else {
+		infos = result.Data.([]*model.FileInfo)
+		for _, info := range infos {
+			res, err := a.FileExists(info.Path)
+
+			if err != nil {
+				mlog.Warn(fmt.Sprintf("Error checking existence of file '%s': %s", info.Path, err))
+				continue
+			}
+
+			if res {
+				a.RemoveFile(info.Path)
+			} else {
+				mlog.Warn(fmt.Sprintf("Unable to remove file '%s': %s", info.Path, err))
+			}
+
+		}
+	}
+
+	if result := <-a.Srv.Store.FileInfo().PermanentDeleteByUser(user.Id); result.Err != nil {
+		return result.Err
+	}
+
 	if result := <-a.Srv.Store.User().PermanentDelete(user.Id); result.Err != nil {
 		return result.Err
 	}

app/user_test.go

@@ -480,3 +480,47 @@ func TestCreateUserWithToken(t *testing.T) {
 		}
 	})
 }
+
+func TestPermanentDeleteUser(t *testing.T) {
+	th := Setup().InitBasic()
+	defer th.TearDown()
+
+	b := []byte("testimage")
+
+	finfo, err := th.App.DoUploadFile(time.Now(), th.BasicTeam.Id, th.BasicChannel.Id, th.BasicUser.Id, "testfile.txt", b)
+
+	if err != nil {
+		t.Log(err)
+		t.Fatal("Unable to upload file")
+	}
+
+	err = th.App.PermanentDeleteUser(th.BasicUser)
+	if err != nil {
+		t.Log(err)
+		t.Fatal("Unable to delete user")
+	}
+
+	res, err := th.App.FileExists(finfo.Path)
+
+	if err != nil {
+		t.Log(err)
+		t.Fatal("Unable to check whether file exists")
+	}
+
+	if res {
+		t.Log(err)
+		t.Fatal("File was not deleted on FS")
+	}
+
+	finfo, err = th.App.GetFileInfo(finfo.Id)
+
+	if finfo != nil {
+		t.Log(err)
+		t.Fatal("Unable to find finfo")
+	}
+
+	if err == nil {
+		t.Log(err)
+		t.Fatal("GetFileInfo after DeleteUser is nil")
+	}
+}