Add event service, caddy test domain

Signed-off-by: Asai Neko <sugar@sne.moe>

data/user.go

@@ -1,11 +1,17 @@
 package data
 
 import (
+	"context"
+	"errors"
+	"fmt"
+	"math/rand"
+	"strings"
 	"time"
 
 	"github.com/go-viper/mapstructure/v2"
 	"github.com/google/uuid"
 	"github.com/meilisearch/meilisearch-go"
+	"github.com/spf13/viper"
 	"gorm.io/datatypes"
 	"gorm.io/gorm"
 	"gorm.io/gorm/clause"
@@ -157,3 +163,62 @@ func (self *User) FastListUsers(limit, offset int64) (*[]UserSearchDoc, error) {
 	}
 	return &list, nil
 }
+
+func (self *User) GenCheckinCode(eventId uuid.UUID) (*string, error) {
+	rng := rand.New(rand.NewSource(time.Now().UnixNano()))
+	randomNumber := rng.Intn(900000) + 100000
+	randNumString := fmt.Sprintf("%06d", randomNumber)
+	ctx := context.Background()
+	ttl := viper.GetDuration("ttl.checkin_code_ttl")
+	Redis.Set(
+		ctx,
+		"checkin_code:"+randNumString,
+		self.UserId.String()+":"+eventId.String(),
+		ttl,
+	)
+	return &randNumString, nil
+}
+
+func (self *User) VerifyCheckinCode(checkinCode string) (*uuid.UUID, error) {
+	ctx := context.Background()
+
+	result := Redis.Get(ctx, "checkin_code:"+checkinCode).String()
+
+	if result == "" {
+		return nil, errors.New("invalid or expired checkin code")
+	}
+
+	split := strings.Split(result, ":")
+	if len(split) < 2 {
+		return nil, errors.New("invalid checkin code format")
+	}
+
+	userId := split[0]
+	eventId := split[1]
+
+	var returnedUserId uuid.UUID
+	err := Database.Transaction(func(tx *gorm.DB) error {
+		checkinData := map[string]interface{}{
+			eventId: time.Now(),
+		}
+
+		if err := tx.Model(&User{}).Where("user_id = ?", userId).Updates(map[string]interface{}{
+			"checkin": checkinData,
+		}).Error; err != nil {
+			return err
+		}
+
+		parsedUserId, err := uuid.Parse(userId)
+		if err != nil {
+			return err
+		}
+		returnedUserId = parsedUserId
+		return nil
+	})
+
+	if err != nil {
+		return nil, err
+	}
+
+	return &returnedUserId, nil
+}