1 files changed, 221 insertions, 0 deletions
diff --git a/vendor/maunium.net/go/mautrix/statestore.go b/vendor/maunium.net/go/mautrix/statestore.go
new file mode 100644
index 00000000..bfe38cc9
--- /dev/null
+++ b/vendor/maunium.net/go/mautrix/statestore.go
@@ -0,0 +1,221 @@
+// Copyright (c) 2023 Tulir Asokan
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+package mautrix
+
+import (
+	"sync"
+
+	"maunium.net/go/mautrix/event"
+	"maunium.net/go/mautrix/id"
+)
+
+// StateStore is an interface for storing basic room state information.
+type StateStore interface {
+	IsInRoom(roomID id.RoomID, userID id.UserID) bool
+	IsInvited(roomID id.RoomID, userID id.UserID) bool
+	IsMembership(roomID id.RoomID, userID id.UserID, allowedMemberships ...event.Membership) bool
+	GetMember(roomID id.RoomID, userID id.UserID) *event.MemberEventContent
+	TryGetMember(roomID id.RoomID, userID id.UserID) (*event.MemberEventContent, bool)
+	SetMembership(roomID id.RoomID, userID id.UserID, membership event.Membership)
+	SetMember(roomID id.RoomID, userID id.UserID, member *event.MemberEventContent)
+
+	SetPowerLevels(roomID id.RoomID, levels *event.PowerLevelsEventContent)
+	GetPowerLevels(roomID id.RoomID) *event.PowerLevelsEventContent
+
+	SetEncryptionEvent(roomID id.RoomID, content *event.EncryptionEventContent)
+	IsEncrypted(roomID id.RoomID) bool
+}
+
+func UpdateStateStore(store StateStore, evt *event.Event) {
+	if store == nil || evt == nil || evt.StateKey == nil {
+		return
+	}
+	// We only care about events without a state key (power levels, encryption) or member events with state key
+	if evt.Type != event.StateMember && evt.GetStateKey() != "" {
+		return
+	}
+	switch content := evt.Content.Parsed.(type) {
+	case *event.MemberEventContent:
+		store.SetMember(evt.RoomID, id.UserID(evt.GetStateKey()), content)
+	case *event.PowerLevelsEventContent:
+		store.SetPowerLevels(evt.RoomID, content)
+	case *event.EncryptionEventContent:
+		store.SetEncryptionEvent(evt.RoomID, content)
+	}
+}
+
+// StateStoreSyncHandler can be added as an event handler in the syncer to update the state store automatically.
+//
+//	client.Syncer.(mautrix.ExtensibleSyncer).OnEvent(client.StateStoreSyncHandler)
+//
+// DefaultSyncer.ParseEventContent must also be true for this to work (which it is by default).
+func (cli *Client) StateStoreSyncHandler(_ EventSource, evt *event.Event) {
+	UpdateStateStore(cli.StateStore, evt)
+}
+
+type MemoryStateStore struct {
+	Registrations map[id.UserID]bool                                    `json:"registrations"`
+	Members       map[id.RoomID]map[id.UserID]*event.MemberEventContent `json:"memberships"`
+	PowerLevels   map[id.RoomID]*event.PowerLevelsEventContent          `json:"power_levels"`
+	Encryption    map[id.RoomID]*event.EncryptionEventContent           `json:"encryption"`
+
+	registrationsLock sync.RWMutex
+	membersLock       sync.RWMutex
+	powerLevelsLock   sync.RWMutex
+	encryptionLock    sync.RWMutex
+}
+
+func NewMemoryStateStore() StateStore {
+	return &MemoryStateStore{
+		Registrations: make(map[id.UserID]bool),
+		Members:       make(map[id.RoomID]map[id.UserID]*event.MemberEventContent),
+		PowerLevels:   make(map[id.RoomID]*event.PowerLevelsEventContent),
+	}
+}
+
+func (store *MemoryStateStore) IsRegistered(userID id.UserID) bool {
+	store.registrationsLock.RLock()
+	defer store.registrationsLock.RUnlock()
+	registered, ok := store.Registrations[userID]
+	return ok && registered
+}
+
+func (store *MemoryStateStore) MarkRegistered(userID id.UserID) {
+	store.registrationsLock.Lock()
+	defer store.registrationsLock.Unlock()
+	store.Registrations[userID] = true
+}
+
+func (store *MemoryStateStore) GetRoomMembers(roomID id.RoomID) map[id.UserID]*event.MemberEventContent {
+	store.membersLock.RLock()
+	members, ok := store.Members[roomID]
+	store.membersLock.RUnlock()
+	if !ok {
+		members = make(map[id.UserID]*event.MemberEventContent)
+		store.membersLock.Lock()
+		store.Members[roomID] = members
+		store.membersLock.Unlock()
+	}
+	return members
+}
+
+func (store *MemoryStateStore) GetMembership(roomID id.RoomID, userID id.UserID) event.Membership {
+	return store.GetMember(roomID, userID).Membership
+}
+
+func (store *MemoryStateStore) GetMember(roomID id.RoomID, userID id.UserID) *event.MemberEventContent {
+	member, ok := store.TryGetMember(roomID, userID)
+	if !ok {
+		member = &event.MemberEventContent{Membership: event.MembershipLeave}
+	}
+	return member
+}
+
+func (store *MemoryStateStore) TryGetMember(roomID id.RoomID, userID id.UserID) (member *event.MemberEventContent, ok bool) {
+	store.membersLock.RLock()
+	defer store.membersLock.RUnlock()
+	members, membersOk := store.Members[roomID]
+	if !membersOk {
+		return
+	}
+	member, ok = members[userID]
+	return
+}
+
+func (store *MemoryStateStore) IsInRoom(roomID id.RoomID, userID id.UserID) bool {
+	return store.IsMembership(roomID, userID, "join")
+}
+
+func (store *MemoryStateStore) IsInvited(roomID id.RoomID, userID id.UserID) bool {
+	return store.IsMembership(roomID, userID, "join", "invite")
+}
+
+func (store *MemoryStateStore) IsMembership(roomID id.RoomID, userID id.UserID, allowedMemberships ...event.Membership) bool {
+	membership := store.GetMembership(roomID, userID)
+	for _, allowedMembership := range allowedMemberships {
+		if allowedMembership == membership {
+			return true
+		}
+	}
+	return false
+}
+
+func (store *MemoryStateStore) SetMembership(roomID id.RoomID, userID id.UserID, membership event.Membership) {
+	store.membersLock.Lock()
+	members, ok := store.Members[roomID]
+	if !ok {
+		members = map[id.UserID]*event.MemberEventContent{
+			userID: {Membership: membership},
+		}
+	} else {
+		member, ok := members[userID]
+		if !ok {
+			members[userID] = &event.MemberEventContent{Membership: membership}
+		} else {
+			member.Membership = membership
+			members[userID] = member
+		}
+	}
+	store.Members[roomID] = members
+	store.membersLock.Unlock()
+}
+
+func (store *MemoryStateStore) SetMember(roomID id.RoomID, userID id.UserID, member *event.MemberEventContent) {
+	store.membersLock.Lock()
+	members, ok := store.Members[roomID]
+	if !ok {
+		members = map[id.UserID]*event.MemberEventContent{
+			userID: member,
+		}
+	} else {
+		members[userID] = member
+	}
+	store.Members[roomID] = members
+	store.membersLock.Unlock()
+}
+
+func (store *MemoryStateStore) SetPowerLevels(roomID id.RoomID, levels *event.PowerLevelsEventContent) {
+	store.powerLevelsLock.Lock()
+	store.PowerLevels[roomID] = levels
+	store.powerLevelsLock.Unlock()
+}
+
+func (store *MemoryStateStore) GetPowerLevels(roomID id.RoomID) (levels *event.PowerLevelsEventContent) {
+	store.powerLevelsLock.RLock()
+	levels = store.PowerLevels[roomID]
+	store.powerLevelsLock.RUnlock()
+	return
+}
+
+func (store *MemoryStateStore) GetPowerLevel(roomID id.RoomID, userID id.UserID) int {
+	return store.GetPowerLevels(roomID).GetUserLevel(userID)
+}
+
+func (store *MemoryStateStore) GetPowerLevelRequirement(roomID id.RoomID, eventType event.Type) int {
+	return store.GetPowerLevels(roomID).GetEventLevel(eventType)
+}
+
+func (store *MemoryStateStore) HasPowerLevel(roomID id.RoomID, userID id.UserID, eventType event.Type) bool {
+	return store.GetPowerLevel(roomID, userID) >= store.GetPowerLevelRequirement(roomID, eventType)
+}
+
+func (store *MemoryStateStore) SetEncryptionEvent(roomID id.RoomID, content *event.EncryptionEventContent) {
+	store.encryptionLock.Lock()
+	store.Encryption[roomID] = content
+	store.encryptionLock.Unlock()
+}
+
+func (store *MemoryStateStore) GetEncryptionEvent(roomID id.RoomID) *event.EncryptionEventContent {
+	store.encryptionLock.RLock()
+	defer store.encryptionLock.RUnlock()
+	return store.Encryption[roomID]
+}
+
+func (store *MemoryStateStore) IsEncrypted(roomID id.RoomID) bool {
+	cfg := store.GetEncryptionEvent(roomID)
+	return cfg != nil && cfg.Algorithm == id.AlgorithmMegolmV1
+}