[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

4 files changed, 122 insertions, 1 deletions

diff --git a/internal/processing/admin/admin.go b/internal/processing/admin/admin.go
index 962a3ac7c..0e8f0c27a 100644
--- a/internal/processing/admin/admin.go
+++ b/internal/processing/admin/admin.go
@@ -44,6 +44,7 @@ type Processor interface {
 	EmojisGet(ctx context.Context, account *gtsmodel.Account, user *gtsmodel.User, domain string, includeDisabled bool, includeEnabled bool, shortcode string, maxShortcodeDomain string, minShortcodeDomain string, limit int) (*apimodel.PageableResponse, gtserror.WithCode)
 	EmojiGet(ctx context.Context, account *gtsmodel.Account, user *gtsmodel.User, id string) (*apimodel.AdminEmoji, gtserror.WithCode)
 	EmojiDelete(ctx context.Context, id string) (*apimodel.AdminEmoji, gtserror.WithCode)
+	EmojiCategoriesGet(ctx context.Context) ([]*apimodel.EmojiCategory, gtserror.WithCode)
 	MediaPrune(ctx context.Context, mediaRemoteCacheDays int) gtserror.WithCode
 }
 
diff --git a/internal/processing/admin/createemoji.go b/internal/processing/admin/createemoji.go
index a315e144e..db51d52b6 100644
--- a/internal/processing/admin/createemoji.go
+++ b/internal/processing/admin/createemoji.go
@@ -28,6 +28,7 @@ import (
 	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
 	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
 	"github.com/superseriousbusiness/gotosocial/internal/id"
+	"github.com/superseriousbusiness/gotosocial/internal/media"
 	"github.com/superseriousbusiness/gotosocial/internal/uris"
 )
 
@@ -57,7 +58,19 @@ func (p *processor) EmojiCreate(ctx context.Context, account *gtsmodel.Account,
 		return f, form.Image.Size, err
 	}
 
-	processingEmoji, err := p.mediaManager.ProcessEmoji(ctx, data, nil, form.Shortcode, emojiID, emojiURI, nil, false)
+	var ai *media.AdditionalEmojiInfo
+	if form.CategoryName != "" {
+		category, err := p.GetOrCreateEmojiCategory(ctx, form.CategoryName)
+		if err != nil {
+			return nil, gtserror.NewErrorInternalError(fmt.Errorf("error putting id in category: %s", err), "error putting id in category")
+		}
+
+		ai = &media.AdditionalEmojiInfo{
+			CategoryID: &category.ID,
+		}
+	}
+
+	processingEmoji, err := p.mediaManager.ProcessEmoji(ctx, data, nil, form.Shortcode, emojiID, emojiURI, ai, false)
 	if err != nil {
 		return nil, gtserror.NewErrorInternalError(fmt.Errorf("error processing emoji: %s", err), "error processing emoji")
 	}
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
+}
diff --git a/internal/processing/admin/getcategories.go b/internal/processing/admin/getcategories.go
new file mode 100644
index 000000000..b38cc8f0c
--- /dev/null
+++ b/internal/processing/admin/getcategories.go
@@ -0,0 +1,47 @@
+/*
+   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"
+	"fmt"
+
+	apimodel "github.com/superseriousbusiness/gotosocial/internal/api/model"
+	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
+)
+
+func (p *processor) EmojiCategoriesGet(ctx context.Context) ([]*apimodel.EmojiCategory, gtserror.WithCode) {
+	categories, err := p.db.GetEmojiCategories(ctx)
+	if err != nil {
+		err := fmt.Errorf("EmojiCategoriesGet: db error: %s", err)
+		return nil, gtserror.NewErrorInternalError(err)
+	}
+
+	apiCategories := make([]*apimodel.EmojiCategory, 0, len(categories))
+	for _, category := range categories {
+		apiCategory, err := p.tc.EmojiCategoryToAPIEmojiCategory(ctx, category)
+		if err != nil {
+			err := fmt.Errorf("EmojiCategoriesGet: error converting emoji category to api emoji category: %s", err)
+			return nil, gtserror.NewErrorInternalError(err)
+		}
+		apiCategories = append(apiCategories, apiCategory)
+	}
+
+	return apiCategories, nil
+}