[feature] Add `/api/v1/admin/custom_emojis/{id}` endpoint for single emoji GET (#910)

* fix error in prev swagger docs

* add GET for single admin emoji

1 files changed, 54 insertions, 0 deletions

diff --git a/internal/processing/admin/getemoji.go b/internal/processing/admin/getemoji.go
new file mode 100644
index 000000000..ee3f997de
--- /dev/null
+++ b/internal/processing/admin/getemoji.go
@@ -0,0 +1,54 @@
+/*
+   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"
+
+	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) EmojiGet(ctx context.Context, account *gtsmodel.Account, user *gtsmodel.User, id string) (*apimodel.AdminEmoji, gtserror.WithCode) {
+	if !*user.Admin {
+		return nil, gtserror.NewErrorUnauthorized(fmt.Errorf("user %s not an admin", user.ID), "user is not an admin")
+	}
+
+	emoji, err := p.db.GetEmojiByID(ctx, id)
+	if err != nil {
+		if errors.Is(err, db.ErrNoEntries) {
+			err = fmt.Errorf("EmojiGet: no emoji with id %s found in the db", id)
+			return nil, gtserror.NewErrorNotFound(err)
+		}
+		err := fmt.Errorf("EmojiGet: db error: %s", err)
+		return nil, gtserror.NewErrorInternalError(err)
+	}
+
+	adminEmoji, err := p.tc.EmojiToAdminAPIEmoji(ctx, emoji)
+	if err != nil {
+		err = fmt.Errorf("EmojiGet: error converting emoji to admin api emoji: %s", err)
+		return nil, gtserror.NewErrorInternalError(err)
+	}
+
+	return adminEmoji, nil
+}