Domain block (#76)

* start work on admin domain blocking

* move stuff around + further work on domain blocks

* move + restructure processor

* prep work for deleting account

* tidy

* go fmt

* formatting

* domain blocking more work

* check domain blocks way earlier on

* progress on delete account

* delete more stuff when an account is gone

* and more...

* domain blocky block block

* get individual domain block, delete a block

internal/processing/media/getmedia.go

@@ -0,0 +1,51 @@
+/*
+   GoToSocial
+   Copyright (C) 2021 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
+
+import (
+	"errors"
+	"fmt"
+
+	apimodel "github.com/superseriousbusiness/gotosocial/internal/api/model"
+	"github.com/superseriousbusiness/gotosocial/internal/db"
+	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+)
+
+func (p *processor) GetMedia(account *gtsmodel.Account, mediaAttachmentID string) (*apimodel.Attachment, gtserror.WithCode) {
+	attachment := &gtsmodel.MediaAttachment{}
+	if err := p.db.GetByID(mediaAttachmentID, attachment); err != nil {
+		if _, ok := err.(db.ErrNoEntries); ok {
+			// attachment doesn't exist
+			return nil, gtserror.NewErrorNotFound(errors.New("attachment doesn't exist in the db"))
+		}
+		return nil, gtserror.NewErrorNotFound(fmt.Errorf("db error getting attachment: %s", err))
+	}
+
+	if attachment.AccountID != account.ID {
+		return nil, gtserror.NewErrorNotFound(errors.New("attachment not owned by requesting account"))
+	}
+
+	a, err := p.tc.AttachmentToMasto(attachment)
+	if err != nil {
+		return nil, gtserror.NewErrorNotFound(fmt.Errorf("error converting attachment: %s", err))
+	}
+
+	return &a, nil
+}