feat_: light, no-network versions of permission checking functions

Light functions are based on the fact that permissions are met if the user is on community/channel member list.
If the user is not on the list, permissions will not be met and the client is responsible to use regular permissions-check functions.
For all permissions-check functions, corresponding light versions are added: CheckAllChannelsPermissionsLight,
CheckChannelPermissionsLight, CheckPermissionToJoinLight.

Issue #14220

protocol/communities/manager.go

@@ -2527,6 +2527,17 @@ func (m *Manager) CheckPermissionToJoin(id []byte, addresses []gethcommon.Addres
 	return m.PermissionChecker.CheckPermissionToJoin(community, addresses)
 }
 
+// Light version of CheckPermissionToJoin, which does not use network requests.
+// Instead of checking wallet balances it checks if there is an access to a member list of the community.
+func (m *Manager) CheckPermissionToJoinLight(id []byte) (bool, error) {
+	community, err := m.GetByID(id)
+	if err != nil {
+		return false, err
+	}
+	meAsMember := community.GetMember(&m.identity.PublicKey)
+	return meAsMember != nil, nil
+}
+
 func (m *Manager) accountsSatisfyPermissionsToJoin(
 	communityPermissionsPreParsedData map[protobuf.CommunityTokenPermission_Type]*PreParsedCommunityPermissionsData,
 	accountsAndChainIDs []*AccountChainIDsCombination) (bool, protobuf.CommunityMember_Roles, error) {
@@ -3099,6 +3110,59 @@ func (m *Manager) CheckChannelPermissions(communityID types.HexBytes, chatID str
 	return response, nil
 }
 
+func (m *Manager) checkChannelPermissionsLight(community *Community, communityChat *protobuf.CommunityChat, channelID string) *CheckChannelPermissionsResponse {
+
+	viewOnlyPermissions := community.ChannelTokenPermissionsByType(community.IDString()+channelID, protobuf.CommunityTokenPermission_CAN_VIEW_CHANNEL)
+	viewAndPostPermissions := community.ChannelTokenPermissionsByType(community.IDString()+channelID, protobuf.CommunityTokenPermission_CAN_VIEW_AND_POST_CHANNEL)
+
+	hasViewOnlyPermissions := len(viewOnlyPermissions) > 0
+	hasViewAndPostPermissions := len(viewAndPostPermissions) > 0
+
+	meAsMember := communityChat.Members[common.PubkeyToHex(&m.identity.PublicKey)]
+
+	viewSatisfied := !hasViewOnlyPermissions || (meAsMember != nil && meAsMember.GetChannelRole() == protobuf.CommunityMember_CHANNEL_ROLE_VIEWER)
+	postSatisfied := !hasViewAndPostPermissions || (meAsMember != nil && meAsMember.GetChannelRole() == protobuf.CommunityMember_CHANNEL_ROLE_POSTER)
+
+	finalViewSatisfied := m.computeViewOnlySatisfied(hasViewOnlyPermissions, hasViewAndPostPermissions, viewSatisfied, postSatisfied)
+	finalPostSatisfied := m.computeViewAndPostSatisfied(hasViewOnlyPermissions, hasViewAndPostPermissions, postSatisfied)
+
+	return &CheckChannelPermissionsResponse{
+		ViewOnlyPermissions: &CheckChannelViewOnlyPermissionsResult{
+			Satisfied:   finalViewSatisfied,
+			Permissions: make(map[string]*PermissionTokenCriteriaResult),
+		},
+		ViewAndPostPermissions: &CheckChannelViewAndPostPermissionsResult{
+			Satisfied:   finalPostSatisfied,
+			Permissions: make(map[string]*PermissionTokenCriteriaResult),
+		},
+	}
+}
+
+// Light version of CheckChannelPermissions, which does not use network requests.
+// Instead of checking wallet balances it checks if there is an access to a member list of the chat.
+func (m *Manager) CheckChannelPermissionsLight(communityID types.HexBytes, chatID string) (*CheckChannelPermissionsResponse, error) {
+	community, err := m.GetByID(communityID)
+	if err != nil {
+		return nil, err
+	}
+
+	// Remove communityID prefix from chatID if exists
+	if strings.HasPrefix(chatID, communityID.String()) {
+		chatID = strings.TrimPrefix(chatID, communityID.String())
+	}
+
+	if chatID == "" {
+		return nil, errors.New(fmt.Sprintf("couldn't check channel permissions, invalid chat id: %s", chatID))
+	}
+
+	communityChat, err := community.GetChat(chatID)
+	if err != nil {
+		return nil, err
+	}
+
+	return m.checkChannelPermissionsLight(community, communityChat, chatID), nil
+}
+
 type CheckChannelPermissionsResponse struct {
 	ViewOnlyPermissions    *CheckChannelViewOnlyPermissionsResult    `json:"viewOnlyPermissions"`
 	ViewAndPostPermissions *CheckChannelViewAndPostPermissionsResult `json:"viewAndPostPermissions"`
@@ -3114,6 +3178,22 @@ type CheckChannelViewAndPostPermissionsResult struct {
 	Permissions map[string]*PermissionTokenCriteriaResult `json:"permissions"`
 }
 
+func (m *Manager) computeViewOnlySatisfied(hasViewOnlyPermissions bool, hasViewAndPostPermissions bool, checkedViewOnlySatisfied bool, checkedViewAndPostSatisified bool) bool {
+	if (hasViewAndPostPermissions && !hasViewOnlyPermissions) || (hasViewOnlyPermissions && hasViewAndPostPermissions && checkedViewAndPostSatisified) {
+		return checkedViewAndPostSatisified
+	} else {
+		return checkedViewOnlySatisfied
+	}
+}
+
+func (m *Manager) computeViewAndPostSatisfied(hasViewOnlyPermissions bool, hasViewAndPostPermissions bool, checkedViewAndPostSatisified bool) bool {
+	if hasViewOnlyPermissions && !hasViewAndPostPermissions {
+		return false
+	} else {
+		return checkedViewAndPostSatisified
+	}
+}
+
 func (m *Manager) checkChannelPermissions(viewOnlyPreParsedPermissions *PreParsedCommunityPermissionsData, viewAndPostPreParsedPermissions *PreParsedCommunityPermissionsData, accountsAndChainIDs []*AccountChainIDsCombination, shortcircuit bool) (*CheckChannelPermissionsResponse, error) {
 
 	response := &CheckChannelPermissionsResponse{
@@ -3140,18 +3220,10 @@ func (m *Manager) checkChannelPermissions(viewOnlyPreParsedPermissions *PreParse
 	hasViewOnlyPermissions := viewOnlyPreParsedPermissions != nil
 	hasViewAndPostPermissions := viewAndPostPreParsedPermissions != nil
 
-	if (hasViewAndPostPermissions && !hasViewOnlyPermissions) || (hasViewOnlyPermissions && hasViewAndPostPermissions && viewAndPostPermissionsResponse.Satisfied) {
-		response.ViewOnlyPermissions.Satisfied = viewAndPostPermissionsResponse.Satisfied
-	} else {
-		response.ViewOnlyPermissions.Satisfied = viewOnlyPermissionsResponse.Satisfied
-	}
+	response.ViewOnlyPermissions.Satisfied = m.computeViewOnlySatisfied(hasViewOnlyPermissions, hasViewAndPostPermissions, viewOnlyPermissionsResponse.Satisfied, viewAndPostPermissionsResponse.Satisfied)
 	response.ViewOnlyPermissions.Permissions = viewOnlyPermissionsResponse.Permissions
 
-	if hasViewOnlyPermissions && !hasViewAndPostPermissions {
-		response.ViewAndPostPermissions.Satisfied = false
-	} else {
-		response.ViewAndPostPermissions.Satisfied = viewAndPostPermissionsResponse.Satisfied
-	}
+	response.ViewAndPostPermissions.Satisfied = m.computeViewAndPostSatisfied(hasViewOnlyPermissions, hasViewAndPostPermissions, viewAndPostPermissionsResponse.Satisfied)
 	response.ViewAndPostPermissions.Permissions = viewAndPostPermissionsResponse.Permissions
 
 	return response, nil
@@ -3194,6 +3266,27 @@ func (m *Manager) CheckAllChannelsPermissions(communityID types.HexBytes, addres
 	return response, nil
 }
 
+// Light version of CheckAllChannelsPermissionsLight, which does not use network requests.
+// Instead of checking wallet balances it checks if there is an access to a member list of chats.
+func (m *Manager) CheckAllChannelsPermissionsLight(communityID types.HexBytes) (*CheckAllChannelsPermissionsResponse, error) {
+
+	community, err := m.GetByID(communityID)
+	if err != nil {
+		return nil, err
+	}
+
+	response := &CheckAllChannelsPermissionsResponse{
+		Channels: make(map[string]*CheckChannelPermissionsResponse),
+	}
+
+	channels := community.Chats()
+
+	for channelID, channel := range channels {
+		response.Channels[community.IDString()+channelID] = m.checkChannelPermissionsLight(community, channel, channelID)
+	}
+	return response, nil
+}
+
 func (m *Manager) GetCheckChannelPermissionResponses(communityID types.HexBytes) (*CheckAllChannelsPermissionsResponse, error) {
 
 	response, err := m.persistence.GetCheckChannelPermissionResponses(communityID.String())

protocol/messenger_communities.go

@@ -4322,6 +4322,14 @@ func (m *Messenger) CheckPermissionsToJoinCommunity(request *requests.CheckPermi
 	return m.communitiesManager.CheckPermissionToJoin(request.CommunityID, addresses)
 }
 
+func (m *Messenger) CheckPermissionsToJoinCommunityLight(request *requests.CheckPermissionToJoinCommunity) (bool, error) {
+	if err := request.Validate(); err != nil {
+		return false, err
+	}
+
+	return m.communitiesManager.CheckPermissionToJoinLight(request.CommunityID)
+}
+
 func (m *Messenger) getSharedAddresses(communityID types.HexBytes, requestAddresses []string) ([]gethcommon.Address, error) {
 	addressesMap := make(map[string]struct{})
 
@@ -4385,6 +4393,22 @@ func (m *Messenger) CheckAllCommunityChannelsPermissions(request *requests.Check
 	return m.communitiesManager.CheckAllChannelsPermissions(request.CommunityID, addresses)
 }
 
+func (m *Messenger) CheckCommunityChannelPermissionsLight(request *requests.CheckCommunityChannelPermissions) (*communities.CheckChannelPermissionsResponse, error) {
+	if err := request.Validate(); err != nil {
+		return nil, err
+	}
+
+	return m.communitiesManager.CheckChannelPermissionsLight(request.CommunityID, request.ChatID)
+}
+
+func (m *Messenger) CheckAllCommunityChannelsPermissionsLight(request *requests.CheckAllCommunityChannelsPermissions) (*communities.CheckAllChannelsPermissionsResponse, error) {
+	if err := request.Validate(); err != nil {
+		return nil, err
+	}
+
+	return m.communitiesManager.CheckAllChannelsPermissionsLight(request.CommunityID)
+}
+
 func (m *Messenger) GetCommunityCheckChannelPermissionResponses(communityID types.HexBytes) (*communities.CheckAllChannelsPermissionsResponse, error) {
 	return m.communitiesManager.GetCheckChannelPermissionResponses(communityID)
 }

services/ext/api.go

@@ -1590,14 +1590,26 @@ func (api *PublicAPI) CheckPermissionsToJoinCommunity(request *requests.CheckPer
 	return api.service.messenger.CheckPermissionsToJoinCommunity(request)
 }
 
+func (api *PublicAPI) CheckPermissionsToJoinCommunityLight(request *requests.CheckPermissionToJoinCommunity) (bool, error) {
+	return api.service.messenger.CheckPermissionsToJoinCommunityLight(request)
+}
+
 func (api *PublicAPI) CheckCommunityChannelPermissions(request *requests.CheckCommunityChannelPermissions) (*communities.CheckChannelPermissionsResponse, error) {
 	return api.service.messenger.CheckCommunityChannelPermissions(request)
 }
 
+func (api *PublicAPI) CheckCommunityChannelPermissionsLight(request *requests.CheckCommunityChannelPermissions) (*communities.CheckChannelPermissionsResponse, error) {
+	return api.service.messenger.CheckCommunityChannelPermissionsLight(request)
+}
+
 func (api *PublicAPI) CheckAllCommunityChannelsPermissions(request *requests.CheckAllCommunityChannelsPermissions) (*communities.CheckAllChannelsPermissionsResponse, error) {
 	return api.service.messenger.CheckAllCommunityChannelsPermissions(request)
 }
 
+func (api *PublicAPI) CheckAllCommunityChannelsPermissionsLight(request *requests.CheckAllCommunityChannelsPermissions) (*communities.CheckAllChannelsPermissionsResponse, error) {
+	return api.service.messenger.CheckAllCommunityChannelsPermissionsLight(request)
+}
+
 func (api *PublicAPI) CollectCommunityMetrics(request *requests.CommunityMetricsRequest) (*protocol.CommunityMetricsResponse, error) {
 	return api.service.messenger.CollectCommunityMetrics(request)
 }