110 lines
3.3 KiB
Go
110 lines
3.3 KiB
Go
package world
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import (
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"fmt"
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"slices"
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"bd2server/internal/server/gamedata"
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"bd2server/internal/server/wire"
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)
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// EventFieldPackSource binds installed hidden packs to the server's current
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// calendars. A purchase receipt alone never authorizes an expired event.
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type EventFieldPackSource interface {
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ResolveEventFieldPack(int) (gamedata.EventFieldPack, bool, error)
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ListEventFieldPacks() ([]gamedata.EventFieldPack, error)
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}
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// PackAvailable exposes the same account/calendar authorization to NPC
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// services without letting them infer access from the client's pack number.
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func (s *Service) PackAvailable(id uint64) bool {
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if id == 0 || id > uint64(^uint32(0)>>1) {
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return false
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}
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return s.packUnlocked(int(id))
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}
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func (s *Service) AttachEventFieldPacks(source EventFieldPackSource) error {
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if source == nil {
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return fmt.Errorf("world: nil event field pack source")
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}
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s.eventFieldPacks = source
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return nil
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}
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func (s *Service) resolveEventFieldPack(id int) (gamedata.EventFieldPack, bool, error) {
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if s.eventFieldPacks == nil {
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return gamedata.EventFieldPack{}, false, nil
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}
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return s.eventFieldPacks.ResolveEventFieldPack(id)
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}
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func (s *Service) eventPackPurchased(id int) bool {
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if s.collection == nil {
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return false
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}
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_, found := s.collection.Grant(packPurchaseIdentity(id))
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return found
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}
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func (s *Service) eventPackDBInfo(pack gamedata.EventFieldPack) []byte {
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row := wire.AppendVarint(nil, 1, uint64(pack.ID))
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if s.eventPackPurchased(pack.ID) {
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row = wire.AppendVarint(row, 8, 1)
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}
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return row
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}
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func (s *Service) eventPackInfoRows() ([][]byte, error) {
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if s.eventFieldPacks == nil {
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return nil, nil
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}
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packs, err := s.eventFieldPacks.ListEventFieldPacks()
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if err != nil {
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return nil, err
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}
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var rows [][]byte
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for _, pack := range packs {
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// PackManager buys a hidden pack only when PackInfo has no row for it.
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if s.eventPackPurchased(pack.ID) {
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rows = append(rows, s.eventPackDBInfo(pack))
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}
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}
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return rows, nil
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}
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func (s *Service) enterEventFieldPack(pack gamedata.EventFieldPack) (int, []byte, bool, error) {
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if !s.eventPackPurchased(pack.ID) {
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return 0, nil, true, fmt.Errorf("%w: event pack %d is not purchased", ErrInvalidRequest, pack.ID)
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}
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position := pack.InitialPosition
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if position == "" {
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return 0, nil, true, fmt.Errorf("world: missing event pack initial position")
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}
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if saved, found := s.state.Position(); found && saved.PackID == pack.ID {
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if !slices.Contains(pack.MapIDs, saved.Position.MapID) {
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return 0, nil, true, fmt.Errorf("%w: map outside event pack", ErrInvalidRequest)
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}
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position = saved.RawJSON
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}
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response := wire.AppendString(nil, 4, position)
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// The common callback dereferences HuntingGroundInfo even in hidden packs.
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// Use the domain-generated empty/current snapshot; never borrow the outside
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// map's monsters or story progress.
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var hunting []byte
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if s.huntingGround != nil {
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var err error
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hunting, err = s.huntingGround.EnsureForPack(pack.ID)
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if err != nil {
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return 0, nil, true, err
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}
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}
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response = wire.AppendBytes(response, 12, hunting)
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// Hidden-pack entry must retain the outside field position: the client
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// intentionally suppresses SaveUserPosition while playing these packs. The
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// persistent active pack also stays outside, so relogin cannot be stranded
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// in a hidden scene after its calendar closes.
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s.setCurrentPack(pack.ID)
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return 5, response, true, nil
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}
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