Limit clan member count to 100

db/clans.go

@@ -119,6 +119,20 @@ func GetClansCount() (int, error) {
 	return count, nil
 }
 
+// GetClanMemberCount Returns the amount of users that are in a given clan
+func GetClanMemberCount(clanId int) (int, error) {
+	var count int
+
+	result := SQL.Raw("SELECT COUNT(*) as count FROM users WHERE clan_id = ?", clanId).
+		Scan(&count)
+
+	if result.Error != nil {
+		return 0, result.Error
+	}
+
+	return count, nil
+}
+
 // DeleteClan Fully deletes a clan with a given id
 func DeleteClan(id int) error {
 	err := SQL.Transaction(func(tx *gorm.DB) error {

handlers/clan_invites.go

@@ -126,6 +126,16 @@ func AcceptClanInvite(c *gin.Context) *APIError {
 		return apiErr
 	}
 
+	memberCount, err := db.GetClanMemberCount(invite.ClanId)
+
+	if err != nil {
+		return APIErrorServerError("Error retrieving clan member count", err)
+	}
+
+	if memberCount >= 100 {
+		return APIErrorBadRequest("The clan you are trying to join is already full.")
+	}
+
 	if err := db.UpdateUserClan(user.Id, invite.ClanId); err != nil {
 		return APIErrorServerError("Error updating user clan", err)
 	}