[feature] Allow newly uploaded emojis to be placed in categories (#939)

* [feature] Add emoji categories GET
Serialize emojis in appropriate categories; make it possible to get categories via the admin API

* [feature] Create (or use existing) category for new emoji uploads

* fix lint issue

* update misleading line in swagger docs

1 files changed, 60 insertions, 0 deletions

diff --git a/internal/processing/admin/emojicategory.go b/internal/processing/admin/emojicategory.go
new file mode 100644
index 000000000..c40649c62
--- /dev/null
+++ b/internal/processing/admin/emojicategory.go
@@ -0,0 +1,60 @@
+/*
+   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 admin
+
+import (
+	"context"
+	"errors"
+	"fmt"
+
+	"github.com/superseriousbusiness/gotosocial/internal/db"
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+	"github.com/superseriousbusiness/gotosocial/internal/id"
+)
+
+func (p *processor) GetOrCreateEmojiCategory(ctx context.Context, name string) (*gtsmodel.EmojiCategory, error) {
+	category, err := p.db.GetEmojiCategoryByName(ctx, name)
+	if err == nil {
+		return category, nil
+	}
+
+	if err != nil && !errors.Is(err, db.ErrNoEntries) {
+		err = fmt.Errorf("GetOrCreateEmojiCategory: database error trying get emoji category by name: %s", err)
+		return nil, err
+	}
+
+	// we don't have the category yet, just create it with the given name
+	categoryID, err := id.NewRandomULID()
+	if err != nil {
+		err = fmt.Errorf("GetOrCreateEmojiCategory: error generating id for new emoji category: %s", err)
+		return nil, err
+	}
+
+	category = &gtsmodel.EmojiCategory{
+		ID:   categoryID,
+		Name: name,
+	}
+
+	if err := p.db.PutEmojiCategory(ctx, category); err != nil {
+		err = fmt.Errorf("GetOrCreateEmojiCategory: error putting new emoji category in the database: %s", err)
+		return nil, err
+	}
+
+	return category, nil
+}