[bugfix] Fix 404 on status delete redraft (#668)

* add unattach function to media processor

* call delete or unattach appropriately
unattach from client api, delete from federated api

* typo fix

internal/processing/media/unattach_test.go

@@ -0,0 +1,53 @@
+/*
+   GoToSocial
+   Copyright (C) 2021-2022 GoToSocial Authors admin@gotosocial.org
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Affero General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Affero General Public License for more details.
+
+   You should have received a copy of the GNU Affero General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package media_test
+
+import (
+	"context"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/suite"
+)
+
+type UnattachTestSuite struct {
+	MediaStandardTestSuite
+}
+
+func (suite *GetFileTestSuite) TestUnattachMedia() {
+	ctx := context.Background()
+
+	testAttachment := suite.testAttachments["admin_account_status_1_attachment_1"]
+	testAccount := suite.testAccounts["admin_account"]
+	suite.NotEmpty(testAttachment.StatusID)
+
+	a, err := suite.mediaProcessor.Unattach(ctx, testAccount, testAttachment.ID)
+	suite.NoError(err)
+	suite.NotNil(a)
+
+	dbAttachment, errWithCode := suite.db.GetAttachmentByID(ctx, a.ID)
+	suite.NoError(errWithCode)
+
+	suite.WithinDuration(dbAttachment.UpdatedAt, time.Now(), 1*time.Minute)
+	suite.Empty(dbAttachment.StatusID)
+}
+
+func TestUnattachTestSuite(t *testing.T) {
+	suite.Run(t, &UnattachTestSuite{})
+}