Add badge capabilities to users (#20607)

Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: zeripath <art27@cantab.net>
Co-authored-by: John Olheiser <john.olheiser@gmail.com>

models/user/badge.go

@@ -0,0 +1,42 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package user
+
+import (
+	"context"
+
+	"code.gitea.io/gitea/models/db"
+)
+
+// Badge represents a user badge
+type Badge struct {
+	ID          int64 `xorm:"pk autoincr"`
+	Description string
+	ImageURL    string
+}
+
+// UserBadge represents a user badge
+type UserBadge struct {
+	ID      int64 `xorm:"pk autoincr"`
+	BadgeID int64
+	UserID  int64 `xorm:"INDEX"`
+}
+
+func init() {
+	db.RegisterModel(new(Badge))
+	db.RegisterModel(new(UserBadge))
+}
+
+// GetUserBadges returns the user's badges.
+func GetUserBadges(ctx context.Context, u *User) ([]*Badge, int64, error) {
+	sess := db.GetEngine(ctx).
+		Select("`badge`.*").
+		Join("INNER", "user_badge", "`user_badge`.badge_id=badge.id").
+		Where("user_badge.user_id=?", u.ID)
+
+	badges := make([]*Badge, 0, 8)
+	count, err := sess.FindAndCount(&badges)
+	return badges, count, err
+}