feature: view only channel reactions (#4820)

* CommunityMember channel role

* make generate

protocol/communities/community.go

@@ -177,7 +177,9 @@ func (o *Community) MarshalPublicAPIJSON() ([]byte, error) {
 			communityItem.Encrypted = o.Encrypted()
 		}
 		for id, c := range o.config.CommunityDescription.Chats {
-			canPost, err := o.CanPost(o.config.MemberIdentity, id)
+			// NOTE: Here `CanPost` is only set for ChatMessage. But it can be different for reactions/pin/etc.
+			// Consider adding more properties to `CommunityChat` to reflect that.
+			canPost, err := o.CanPost(o.config.MemberIdentity, id, protobuf.ApplicationMetadataMessage_CHAT_MESSAGE)
 			if err != nil {
 				return nil, err
 			}
@@ -311,7 +313,9 @@ func (o *Community) MarshalJSON() ([]byte, error) {
 			communityItem.Categories[id] = category
 		}
 		for id, c := range o.config.CommunityDescription.Chats {
-			canPost, err := o.CanPost(o.config.MemberIdentity, id)
+			// NOTE: Here `CanPost` is only set for ChatMessage. But it can be different for reactions/pin/etc.
+			// Consider adding more properties to `CommunityChat` to reflect that.
+			canPost, err := o.CanPost(o.config.MemberIdentity, id, protobuf.ApplicationMetadataMessage_CHAT_MESSAGE)
 			if err != nil {
 				return nil, err
 			}
@@ -1847,7 +1851,7 @@ func (o *Community) VerifyGrantSignature(data []byte) (*protobuf.Grant, error) {
 	return grant, nil
 }
 
-func (o *Community) CanPost(pk *ecdsa.PublicKey, chatID string) (bool, error) {
+func (o *Community) CanPost(pk *ecdsa.PublicKey, chatID string, messageType protobuf.ApplicationMetadataMessage_Type) (bool, error) {
 	if o.config.CommunityDescription.Chats == nil {
 		o.config.Logger.Debug("Community.CanPost: no-chats")
 		return false, nil
@@ -1886,14 +1890,24 @@ func (o *Community) CanPost(pk *ecdsa.PublicKey, chatID string) (bool, error) {
 		return false, nil
 	}
 
-	// Need to also be a chat member to post
+	member, isChatMember := chat.Members[common.PubkeyToHex(pk)]
-	if !o.IsMemberInChat(pk, chatID) {
+
-		o.config.Logger.Debug("Community.CanPost: not a chat member", zap.String("chat-id", chatID))
+	switch messageType {
+	case protobuf.ApplicationMetadataMessage_PIN_MESSAGE:
+		pinAllowed := o.IsPrivilegedMember(pk) || o.AllowsAllMembersToPinMessage()
+		return isChatMember && pinAllowed, nil
+
+	case protobuf.ApplicationMetadataMessage_EMOJI_REACTION:
+		if !isChatMember {
 			return false, nil
 		}
+		isPoster := member.ChannelRole == protobuf.CommunityMember_CHANNEL_ROLE_POSTER
+		isViewer := member.ChannelRole == protobuf.CommunityMember_CHANNEL_ROLE_VIEWER
+		return isPoster || (isViewer && chat.ViewersCanPostReactions), nil
 
-	// all conditions satisfied, user can post after all
+	default:
-	return true, nil
+		return isChatMember, nil
+	}
 }
 
 func (o *Community) BuildGrant(key *ecdsa.PublicKey, chatID string) ([]byte, error) {
@@ -1968,8 +1982,8 @@ func (o *Community) isMember() bool {
 	return o.hasMember(o.config.MemberIdentity)
 }
 
-func (o *Community) CanMemberIdentityPost(chatID string) (bool, error) {
+func (o *Community) CanMemberIdentityPost(chatID string, messageType protobuf.ApplicationMetadataMessage_Type) (bool, error) {
-	return o.CanPost(o.config.MemberIdentity, chatID)
+	return o.CanPost(o.config.MemberIdentity, chatID, messageType)
 }
 
 // CanJoin returns whether a user can join the community, only if it's
@@ -2052,7 +2066,9 @@ func (o *Community) AddMember(publicKey *ecdsa.PublicKey, roles []protobuf.Commu
 	return changes, nil
 }
 
-func (o *Community) AddMemberToChat(chatID string, publicKey *ecdsa.PublicKey, roles []protobuf.CommunityMember_Roles) (*CommunityChanges, error) {
+func (o *Community) AddMemberToChat(chatID string, publicKey *ecdsa.PublicKey,
+	roles []protobuf.CommunityMember_Roles, channelRole protobuf.CommunityMember_ChannelRole) (*CommunityChanges, error) {
+
 	o.mutex.Lock()
 	defer o.mutex.Unlock()
 
@@ -2073,6 +2089,7 @@ func (o *Community) AddMemberToChat(chatID string, publicKey *ecdsa.PublicKey, r
 	}
 	chat.Members[memberKey] = &protobuf.CommunityMember{
 		Roles:       roles,
+		ChannelRole: channelRole,
 	}
 	changes.ChatsModified[chatID] = &CommunityChatChanges{
 		ChatModified: chat,

protocol/communities/community_encryption_key_action_test.go

@@ -761,7 +761,7 @@ func (s *CommunityEncryptionKeyActionSuite) TestChannelLevelKeyActions() {
 			for _, member := range tc.originMembers {
 				_, err := origin.AddMember(member, []protobuf.CommunityMember_Roles{})
 				s.Require().NoError(err)
-				_, err = origin.AddMemberToChat(channelID, member, []protobuf.CommunityMember_Roles{})
+				_, err = origin.AddMemberToChat(channelID, member, []protobuf.CommunityMember_Roles{}, protobuf.CommunityMember_CHANNEL_ROLE_POSTER)
 				s.Require().NoError(err)
 			}
 
@@ -772,7 +772,7 @@ func (s *CommunityEncryptionKeyActionSuite) TestChannelLevelKeyActions() {
 			for _, member := range tc.modifiedMembers {
 				_, err := modified.AddMember(member, []protobuf.CommunityMember_Roles{})
 				s.Require().NoError(err)
-				_, err = modified.AddMemberToChat(channelID, member, []protobuf.CommunityMember_Roles{})
+				_, err = modified.AddMemberToChat(channelID, member, []protobuf.CommunityMember_Roles{}, protobuf.CommunityMember_CHANNEL_ROLE_POSTER)
 				s.Require().NoError(err)
 			}
 
@@ -972,7 +972,7 @@ func (s *CommunityEncryptionKeyActionSuite) TestControlNodeChange() {
 				s.Require().NoError(err)
 			}
 			for _, member := range tc.channelMembers {
-				_, err = origin.AddMemberToChat(channelID, member, []protobuf.CommunityMember_Roles{})
+				_, err = origin.AddMemberToChat(channelID, member, []protobuf.CommunityMember_Roles{}, protobuf.CommunityMember_CHANNEL_ROLE_POSTER)
 				s.Require().NoError(err)
 			}
 

protocol/communities/community_test.go

@@ -452,9 +452,6 @@ func (s *CommunitySuite) TestCanPost() {
 	notMember := &s.member3.PublicKey
 	member := &s.member1.PublicKey
 
-	// MEMBERSHIP-NO-MEMBERSHIP-Member-> User can post
-	// MEMBERSHIP-NO-MEMEBRESHIP->NON member -> User can't post
-
 	testCases := []struct {
 		name    string
 		config  Config
@@ -463,7 +460,7 @@ func (s *CommunitySuite) TestCanPost() {
 		canPost bool
 	}{
 		{
-			name:    "no-membership org with no-membeship chat",
+			name:    "no-membership org with no-membership chat",
 			config:  s.configNoMembershipOrgNoMembershipChat(),
 			member:  notMember,
 			canPost: false,
@@ -481,7 +478,7 @@ func (s *CommunitySuite) TestCanPost() {
 			canPost: true,
 		},
 		{
-			name:    "monsier creator can always post of course",
+			name:    "creator can always post of course",
 			config:  s.configOnRequestOrgNoMembershipChat(),
 			member:  &s.identity.PublicKey,
 			canPost: true,
@@ -494,7 +491,7 @@ func (s *CommunitySuite) TestCanPost() {
 			org, err := New(tc.config, &TimeSourceStub{}, &DescriptionEncryptorMock{})
 			s.Require().NoError(err)
 
-			canPost, err := org.CanPost(tc.member, testChatID1)
+			canPost, err := org.CanPost(tc.member, testChatID1, protobuf.ApplicationMetadataMessage_CHAT_MESSAGE)
 			s.Require().Equal(tc.err, err)
 			s.Require().Equal(tc.canPost, canPost)
 		})

protocol/communities/manager.go

@@ -1046,8 +1046,12 @@ func (m *Manager) ReevaluateMembers(community *Community) (map[protobuf.Communit
 			isMemberAlreadyInChannel := community.IsMemberInChat(memberPubKey, channelID)
 
 			if response.ViewOnlyPermissions.Satisfied || response.ViewAndPostPermissions.Satisfied {
+				channelRole := protobuf.CommunityMember_CHANNEL_ROLE_VIEWER
+				if response.ViewAndPostPermissions.Satisfied {
+					channelRole = protobuf.CommunityMember_CHANNEL_ROLE_POSTER
+				}
 				if !isMemberAlreadyInChannel {
-					_, err := community.AddMemberToChat(channelID, memberPubKey, []protobuf.CommunityMember_Roles{})
+					_, err := community.AddMemberToChat(channelID, memberPubKey, []protobuf.CommunityMember_Roles{}, channelRole)
 					if err != nil {
 						return nil, err
 					}
@@ -2315,27 +2319,37 @@ func (m *Manager) accountsSatisfyPermissionsToJoin(community *Community, account
 	return true, protobuf.CommunityMember_ROLE_NONE, nil
 }
 
-func (m *Manager) accountsSatisfyPermissionsToJoinChannels(community *Community, accounts []*protobuf.RevealedAccount) (map[string]*protobuf.CommunityChat, error) {
+func (m *Manager) accountsSatisfyPermissionsToJoinChannels(community *Community, accounts []*protobuf.RevealedAccount) (map[string]*protobuf.CommunityChat, map[string]*protobuf.CommunityChat, error) {
-	result := make(map[string]*protobuf.CommunityChat)
-
 	accountsAndChainIDs := revealedAccountsToAccountsAndChainIDsCombination(accounts)
 
-	for channelID, channel := range community.config.CommunityDescription.Chats {
+	viewChats, err := m.accountsSatisfyPermissionTypeToJoinChannels(community, accountsAndChainIDs, protobuf.CommunityTokenPermission_CAN_VIEW_CHANNEL)
-		channelViewOnlyPermissions := community.ChannelTokenPermissionsByType(community.IDString()+channelID, protobuf.CommunityTokenPermission_CAN_VIEW_CHANNEL)
+	if err != nil {
-		channelViewAndPostPermissions := community.ChannelTokenPermissionsByType(community.IDString()+channelID, protobuf.CommunityTokenPermission_CAN_VIEW_AND_POST_CHANNEL)
+		return nil, nil, err
-		channelPermissions := append(channelViewOnlyPermissions, channelViewAndPostPermissions...)
+	}
 
-		if len(channelPermissions) > 0 {
+	postChats, err := m.accountsSatisfyPermissionTypeToJoinChannels(community, accountsAndChainIDs, protobuf.CommunityTokenPermission_CAN_VIEW_AND_POST_CHANNEL)
-			permissionResponse, err := m.PermissionChecker.CheckPermissions(channelPermissions, accountsAndChainIDs, true)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	return viewChats, postChats, nil
+}
+
+func (m *Manager) accountsSatisfyPermissionTypeToJoinChannels(community *Community, accounts []*AccountChainIDsCombination, permissionType protobuf.CommunityTokenPermission_Type) (map[string]*protobuf.CommunityChat, error) {
+	result := make(map[string]*protobuf.CommunityChat)
+
+	for channelID, channel := range community.config.CommunityDescription.Chats {
+		permissions := community.ChannelTokenPermissionsByType(community.IDString()+channelID, permissionType)
+		if len(permissions) > 0 {
+			permissionResponse, err := m.PermissionChecker.CheckPermissions(permissions, accounts, true)
 			if err != nil {
 				return nil, err
 			}
-			if permissionResponse.Satisfied {
+			if !permissionResponse.Satisfied {
-				result[channelID] = channel
+				continue
 			}
-		} else {
-			result[channelID] = channel
 		}
+		result[channelID] = channel
 	}
 
 	return result, nil
@@ -2377,13 +2391,20 @@ func (m *Manager) AcceptRequestToJoin(dbRequest *RequestToJoin) (*Community, err
 			return nil, err
 		}
 
-		channels, err := m.accountsSatisfyPermissionsToJoinChannels(community, revealedAccounts)
+		viewChannels, postChannels, err := m.accountsSatisfyPermissionsToJoinChannels(community, revealedAccounts)
 		if err != nil {
 			return nil, err
 		}
 
-		for channelID := range channels {
+		for channelID := range viewChannels {
-			_, err = community.AddMemberToChat(channelID, pk, memberRoles)
+			_, err = community.AddMemberToChat(channelID, pk, memberRoles, protobuf.CommunityMember_CHANNEL_ROLE_VIEWER)
+			if err != nil {
+				return nil, err
+			}
+		}
+
+		for channelID := range postChannels {
+			_, err = community.AddMemberToChat(channelID, pk, memberRoles, protobuf.CommunityMember_CHANNEL_ROLE_POSTER)
 			if err != nil {
 				return nil, err
 			}
@@ -3460,12 +3481,12 @@ func (m *Manager) RequestsToJoinForCommunityAwaitingAddresses(id types.HexBytes)
 	return m.persistence.RequestsToJoinForCommunityAwaitingAddresses(id)
 }
 
-func (m *Manager) CanPost(pk *ecdsa.PublicKey, communityID string, chatID string) (bool, error) {
+func (m *Manager) CanPost(pk *ecdsa.PublicKey, communityID string, chatID string, messageType protobuf.ApplicationMetadataMessage_Type) (bool, error) {
 	community, err := m.GetByIDString(communityID)
 	if err != nil {
 		return false, err
 	}
-	return community.CanPost(pk, chatID)
+	return community.CanPost(pk, chatID, messageType)
 }
 
 func (m *Manager) IsEncrypted(communityID string) (bool, error) {
@@ -4794,7 +4815,7 @@ func (m *Manager) ReevaluatePrivilegedMember(community *Community, tokenPermissi
 		// Make sure privileged user is added to every channel
 		for channelID := range community.Chats() {
 			if !community.IsMemberInChat(memberPubKey, channelID) {
-				_, err := community.AddMemberToChat(channelID, memberPubKey, []protobuf.CommunityMember_Roles{privilegedRole})
+				_, err := community.AddMemberToChat(channelID, memberPubKey, []protobuf.CommunityMember_Roles{privilegedRole}, protobuf.CommunityMember_CHANNEL_ROLE_POSTER)
 				if err != nil {
 					return alreadyHasPrivilegedRole, err
 				}
@@ -5002,7 +5023,7 @@ func (m *Manager) promoteSelfToControlNode(community *Community, clock uint64) (
 		}
 
 		for channelID := range community.Chats() {
-			_, err = community.AddMemberToChat(channelID, &m.identity.PublicKey, ownerRole)
+			_, err = community.AddMemberToChat(channelID, &m.identity.PublicKey, ownerRole, protobuf.CommunityMember_CHANNEL_ROLE_POSTER)
 			if err != nil {
 				return false, err
 			}

protocol/communities_messenger_helpers_test.go

@@ -568,15 +568,15 @@ func waitOnCommunitiesEvent(user *Messenger, condition func(*communities.Subscri
 
 	go func() {
 		defer close(errCh)
+		subscription := user.communitiesManager.Subscribe()
 
 		for {
 			select {
-			case sub, more := <-user.communitiesManager.Subscribe():
+			case sub, more := <-subscription:
 				if !more {
 					errCh <- errors.New("channel closed when waiting for communities event")
 					return
 				}
-
 				if condition(sub) {
 					return
 				}

protocol/communities_messenger_token_permissions_test.go

@@ -2,6 +2,7 @@ package protocol
 
 import (
 	"bytes"
+	"context"
 	"crypto/ecdsa"
 	"errors"
 	"math/big"
@@ -159,11 +160,7 @@ func (s *MessengerCommunitiesTokenPermissionsSuite) SetupTest() {
 	_, err = s.alice.Start()
 	s.Require().NoError(err)
 
-	s.mockedBalances = make(map[uint64]map[gethcommon.Address]map[gethcommon.Address]*hexutil.Big)
+	s.resetMockedBalances()
-	s.mockedBalances[testChainID1] = make(map[gethcommon.Address]map[gethcommon.Address]*hexutil.Big)
-	s.mockedBalances[testChainID1][gethcommon.HexToAddress(aliceAddress1)] = make(map[gethcommon.Address]*hexutil.Big)
-	s.mockedBalances[testChainID1][gethcommon.HexToAddress(aliceAddress2)] = make(map[gethcommon.Address]*hexutil.Big)
-	s.mockedBalances[testChainID1][gethcommon.HexToAddress(bobAddress)] = make(map[gethcommon.Address]*hexutil.Big)
 
 }
 
@@ -231,6 +228,14 @@ func (s *MessengerCommunitiesTokenPermissionsSuite) makeAddressSatisfyTheCriteri
 	s.mockedBalances[chainID][walletAddress][contractAddress] = (*hexutil.Big)(balance)
 }
 
+func (s *MessengerCommunitiesTokenPermissionsSuite) resetMockedBalances() {
+	s.mockedBalances = make(map[uint64]map[gethcommon.Address]map[gethcommon.Address]*hexutil.Big)
+	s.mockedBalances[testChainID1] = make(map[gethcommon.Address]map[gethcommon.Address]*hexutil.Big)
+	s.mockedBalances[testChainID1][gethcommon.HexToAddress(aliceAddress1)] = make(map[gethcommon.Address]*hexutil.Big)
+	s.mockedBalances[testChainID1][gethcommon.HexToAddress(aliceAddress2)] = make(map[gethcommon.Address]*hexutil.Big)
+	s.mockedBalances[testChainID1][gethcommon.HexToAddress(bobAddress)] = make(map[gethcommon.Address]*hexutil.Big)
+}
+
 func (s *MessengerCommunitiesTokenPermissionsSuite) waitOnKeyDistribution(condition func(*CommunityAndKeyActions) bool) <-chan error {
 	testCommunitiesKeyDistributor, ok := s.owner.communitiesKeyDistributor.(*TestCommunitiesKeyDistributor)
 	s.Require().True(ok)
@@ -1002,9 +1007,26 @@ func (s *MessengerCommunitiesTokenPermissionsSuite) TestJoinCommunityAsAdminWith
 	s.Require().Equal(bobAddress, revealedAccounts[0].Address)
 }
 
-func (s *MessengerCommunitiesTokenPermissionsSuite) TestViewChannelPermissions() {
+func (s *MessengerCommunitiesTokenPermissionsSuite) testViewChannelPermissions(viewersCanAddReactions bool) {
 	community, chat := s.createCommunity()
 
+	// setup channel reactions permissions
+	editedChat := &protobuf.CommunityChat{
+		Identity: &protobuf.ChatIdentity{
+			DisplayName: chat.Name,
+			Description: chat.Description,
+			Emoji:       chat.Emoji,
+			Color:       chat.Color,
+		},
+		Permissions: &protobuf.CommunityPermissions{
+			Access: protobuf.CommunityPermissions_AUTO_ACCEPT,
+		},
+		ViewersCanPostReactions: viewersCanAddReactions,
+	}
+
+	_, err := s.owner.EditCommunityChat(community.ID(), chat.ID, editedChat)
+	s.Require().NoError(err)
+
 	// bob joins the community
 	s.advertiseCommunityTo(community, s.bob)
 	s.joinCommunity(community, s.bob, bobPassword, []string{})
@@ -1016,12 +1038,8 @@ func (s *MessengerCommunitiesTokenPermissionsSuite) TestViewChannelPermissions()
 	response, err := WaitOnMessengerResponse(
 		s.bob,
 		func(r *MessengerResponse) bool {
-			for _, message := range r.messages {
+			_, ok := r.messages[msg.ID]
-				if message.Text == msg.Text {
+			return ok
-					return true
-				}
-			}
-			return false
 		},
 		"no messages",
 	)
@@ -1029,6 +1047,15 @@ func (s *MessengerCommunitiesTokenPermissionsSuite) TestViewChannelPermissions()
 	s.Require().Len(response.Messages(), 1)
 	s.Require().Equal(msg.Text, response.Messages()[0].Text)
 
+	waitOnBobToBeKickedFromChannel := waitOnCommunitiesEvent(s.owner, func(sub *communities.Subscription) bool {
+		channel, ok := sub.Community.Chats()[chat.CommunityChatID()]
+		return ok && len(channel.Members) == 1
+	})
+	waitOnChannelToBeRekeyedOnceBobIsKicked := s.waitOnKeyDistribution(func(sub *CommunityAndKeyActions) bool {
+		action, ok := sub.keyActions.ChannelKeysActions[chat.CommunityChatID()]
+		return ok && (action.ActionType == communities.EncryptionKeyRekey || action.ActionType == communities.EncryptionKeyAdd)
+	})
+
 	// setup view channel permission
 	channelPermissionRequest := requests.CreateCommunityTokenPermission{
 		CommunityID: community.ID(),
@@ -1045,24 +1072,6 @@ func (s *MessengerCommunitiesTokenPermissionsSuite) TestViewChannelPermissions()
 		ChatIds: []string{chat.ID},
 	}
 
-	waitOnBobToBeKickedFromChannel := waitOnCommunitiesEvent(s.owner, func(sub *communities.Subscription) bool {
-		for channelID, channel := range sub.Community.Chats() {
-			if channelID == chat.CommunityChatID() && len(channel.Members) == 1 {
-				return true
-			}
-		}
-		return false
-	})
-	waitOnChannelToBeRekeyedOnceBobIsKicked := s.waitOnKeyDistribution(func(sub *CommunityAndKeyActions) bool {
-		for channelID, action := range sub.keyActions.ChannelKeysActions {
-			// We both listen for Rekey or Add, since the first time around the community goes from non-encrypted to encrypted, and that's an Add
-			if channelID == chat.CommunityChatID() && (action.ActionType == communities.EncryptionKeyRekey || action.ActionType == communities.EncryptionKeyAdd) {
-				return true
-			}
-		}
-		return false
-	})
-
 	response, err = s.owner.CreateCommunityTokenPermission(&channelPermissionRequest)
 	s.Require().NoError(err)
 	s.Require().Len(response.Communities(), 1)
@@ -1080,15 +1089,14 @@ func (s *MessengerCommunitiesTokenPermissionsSuite) TestViewChannelPermissions()
 	_, err = WaitOnMessengerResponse(
 		s.bob,
 		func(r *MessengerResponse) bool {
-			community, err := s.bob.GetCommunityByID(community.ID())
+			c, err := s.bob.GetCommunityByID(community.ID())
 			if err != nil {
 				return false
 			}
-
+			if c == nil {
-			if community == nil {
 				return false
 			}
-			channel := community.Chats()[chat.CommunityChatID()]
+			channel := c.Chats()[chat.CommunityChatID()]
 			return channel != nil && len(channel.Members) == 0
 		},
 		"no community that satisfies criteria",
@@ -1097,19 +1105,15 @@ func (s *MessengerCommunitiesTokenPermissionsSuite) TestViewChannelPermissions()
 
 	// make bob satisfy channel criteria
 	s.makeAddressSatisfyTheCriteria(testChainID1, bobAddress, channelPermissionRequest.TokenCriteria[0])
+	defer s.resetMockedBalances() // reset mocked balances, this test in run with different test cases
 
 	waitOnChannelKeyToBeDistributedToBob := s.waitOnKeyDistribution(func(sub *CommunityAndKeyActions) bool {
-		for channelID, action := range sub.keyActions.ChannelKeysActions {
+		action, ok := sub.keyActions.ChannelKeysActions[chat.CommunityChatID()]
-			if channelID == chat.CommunityChatID() && action.ActionType == communities.EncryptionKeySendToMembers {
+		if !ok || action.ActionType != communities.EncryptionKeySendToMembers {
-				for memberPubKey := range action.Members {
-					if memberPubKey == common.PubkeyToHex(&s.bob.identity.PublicKey) {
-						return true
-					}
-
-				}
-			}
-		}
 			return false
+		}
+		_, ok = action.Members[common.PubkeyToHex(&s.bob.identity.PublicKey)]
+		return ok
 	})
 
 	// force owner to reevaluate channel members
@@ -1129,18 +1133,64 @@ func (s *MessengerCommunitiesTokenPermissionsSuite) TestViewChannelPermissions()
 	response, err = WaitOnMessengerResponse(
 		s.bob,
 		func(r *MessengerResponse) bool {
-			for _, message := range r.messages {
+			_, ok := r.messages[msg.ID]
-				if message.Text == msg.Text {
+			return ok
-					return true
-				}
-			}
-			return false
 		},
 		"no messages",
 	)
 	s.Require().NoError(err)
 	s.Require().Len(response.Messages(), 1)
 	s.Require().Equal(msg.Text, response.Messages()[0].Text)
+
+	// bob can/can't post reactions
+	response, err = s.bob.SendEmojiReaction(context.Background(), chat.ID, msg.ID, protobuf.EmojiReaction_THUMBS_UP)
+	if !viewersCanAddReactions {
+		s.Require().Error(err)
+	} else {
+		s.Require().NoError(err)
+		s.Require().Len(response.emojiReactions, 1)
+		reactionMessage := response.EmojiReactions()[0]
+
+		response, err = WaitOnMessengerResponse(
+			s.owner,
+			func(r *MessengerResponse) bool {
+				_, ok := r.emojiReactions[reactionMessage.ID()]
+				return ok
+			},
+			"no reactions received",
+		)
+
+		if viewersCanAddReactions {
+			s.Require().NoError(err)
+			s.Require().Len(response.EmojiReactions(), 1)
+			s.Require().Equal(response.EmojiReactions()[0].Type, protobuf.EmojiReaction_THUMBS_UP)
+		} else {
+			s.Require().Error(err)
+			s.Require().Len(response.EmojiReactions(), 0)
+		}
+	}
+}
+
+func (s *MessengerCommunitiesTokenPermissionsSuite) TestViewChannelPermissions() {
+	testCases := []struct {
+		name                    string
+		viewersCanPostReactions bool
+	}{
+		{
+			name:                    "viewers are allowed to post reactions",
+			viewersCanPostReactions: true,
+		},
+		{
+			name:                    "viewers are forbidden to post reactions",
+			viewersCanPostReactions: false,
+		},
+	}
+
+	for _, tc := range testCases {
+		s.T().Run(tc.name, func(*testing.T) {
+			s.testViewChannelPermissions(tc.viewersCanPostReactions)
+		})
+	}
 }
 
 func (s *MessengerCommunitiesTokenPermissionsSuite) testReevaluateMemberPrivilegedRoleInOpenCommunity(permissionType protobuf.CommunityTokenPermission_Type) {

protocol/messenger.go

@@ -2227,6 +2227,7 @@ func (m *Messenger) dispatchMessage(ctx context.Context, rawMessage common.RawMe
 		if err != nil {
 			return rawMessage, err
 		}
+
 	case ChatTypeCommunityChat:
 		community, err := m.communitiesManager.GetByIDString(chat.CommunityID)
 		if err != nil {
@@ -2234,14 +2235,18 @@ func (m *Messenger) dispatchMessage(ctx context.Context, rawMessage common.RawMe
 		}
 		rawMessage.PubsubTopic = community.PubsubTopic()
 
-		canPost, err := m.communitiesManager.CanPost(&m.identity.PublicKey, chat.CommunityID, chat.CommunityChatID())
+		canPost, err := m.communitiesManager.CanPost(&m.identity.PublicKey, chat.CommunityID, chat.CommunityChatID(), rawMessage.MessageType)
 		if err != nil {
 			return rawMessage, err
 		}
 
 		if !canPost {
-			m.logger.Error("can't post on chat", zap.String("chat-id", chat.ID), zap.String("chat-name", chat.Name))
+			m.logger.Error("can't post on chat",
-			return rawMessage, errors.New("can't post on chat")
+				zap.String("chatID", chat.ID),
+				zap.String("chatName", chat.Name),
+				zap.Any("messageType", rawMessage.MessageType),
+			)
+			return rawMessage, fmt.Errorf("can't post message type '%d' on chat '%s'", rawMessage.MessageType, chat.ID)
 		}
 
 		logger.Debug("sending community chat message", zap.String("chatName", chat.Name))
@@ -5688,143 +5693,6 @@ func generateAliasAndIdenticon(pk string) (string, string, error) {
 
 }
 
-func (m *Messenger) SendEmojiReaction(ctx context.Context, chatID, messageID string, emojiID protobuf.EmojiReaction_Type) (*MessengerResponse, error) {
-	var response MessengerResponse
-
-	chat, ok := m.allChats.Load(chatID)
-	if !ok {
-		return nil, ErrChatNotFound
-	}
-	clock, _ := chat.NextClockAndTimestamp(m.getTimesource())
-
-	emojiR := &EmojiReaction{
-		EmojiReaction: &protobuf.EmojiReaction{
-			Clock:     clock,
-			MessageId: messageID,
-			ChatId:    chatID,
-			Type:      emojiID,
-		},
-		LocalChatID: chatID,
-		From:        types.EncodeHex(crypto.FromECDSAPub(&m.identity.PublicKey)),
-	}
-	encodedMessage, err := m.encodeChatEntity(chat, emojiR)
-	if err != nil {
-		return nil, err
-	}
-
-	_, err = m.dispatchMessage(ctx, common.RawMessage{
-		LocalChatID:          chatID,
-		Payload:              encodedMessage,
-		SkipGroupMessageWrap: true,
-		MessageType:          protobuf.ApplicationMetadataMessage_EMOJI_REACTION,
-		// Don't resend using datasync, that would create quite a lot
-		// of traffic if clicking too eagelry
-		ResendAutomatically: false,
-	})
-	if err != nil {
-		return nil, err
-	}
-
-	response.AddEmojiReaction(emojiR)
-	response.AddChat(chat)
-
-	err = m.persistence.SaveEmojiReaction(emojiR)
-	if err != nil {
-		return nil, errors.Wrap(err, "Can't save emoji reaction in db")
-	}
-
-	return &response, nil
-}
-
-func (m *Messenger) EmojiReactionsByChatID(chatID string, cursor string, limit int) ([]*EmojiReaction, error) {
-	chat, err := m.persistence.Chat(chatID)
-	if err != nil {
-		return nil, err
-	}
-
-	if chat.Timeline() {
-		var chatIDs = []string{"@" + contactIDFromPublicKey(&m.identity.PublicKey)}
-		m.allContacts.Range(func(contactID string, contact *Contact) (shouldContinue bool) {
-			if contact.added() {
-				chatIDs = append(chatIDs, "@"+contact.ID)
-			}
-			return true
-		})
-		return m.persistence.EmojiReactionsByChatIDs(chatIDs, cursor, limit)
-	}
-	return m.persistence.EmojiReactionsByChatID(chatID, cursor, limit)
-}
-
-func (m *Messenger) EmojiReactionsByChatIDMessageID(chatID string, messageID string) ([]*EmojiReaction, error) {
-	_, err := m.persistence.Chat(chatID)
-	if err != nil {
-		return nil, err
-	}
-
-	return m.persistence.EmojiReactionsByChatIDMessageID(chatID, messageID)
-}
-
-func (m *Messenger) SendEmojiReactionRetraction(ctx context.Context, emojiReactionID string) (*MessengerResponse, error) {
-	emojiR, err := m.persistence.EmojiReactionByID(emojiReactionID)
-	if err != nil {
-		return nil, err
-	}
-
-	// Check that the sender is the key owner
-	pk := types.EncodeHex(crypto.FromECDSAPub(&m.identity.PublicKey))
-	if emojiR.From != pk {
-		return nil, errors.Errorf("identity mismatch, "+
-			"emoji reactions can only be retracted by the reaction sender, "+
-			"emoji reaction sent by '%s', current identity '%s'",
-			emojiR.From, pk,
-		)
-	}
-
-	// Get chat and clock
-	chat, ok := m.allChats.Load(emojiR.GetChatId())
-	if !ok {
-		return nil, ErrChatNotFound
-	}
-	clock, _ := chat.NextClockAndTimestamp(m.getTimesource())
-
-	// Update the relevant fields
-	emojiR.Clock = clock
-	emojiR.Retracted = true
-
-	encodedMessage, err := m.encodeChatEntity(chat, emojiR)
-	if err != nil {
-		return nil, err
-	}
-
-	// Send the marshalled EmojiReactionRetraction protobuf
-	_, err = m.dispatchMessage(ctx, common.RawMessage{
-		LocalChatID:          emojiR.GetChatId(),
-		Payload:              encodedMessage,
-		SkipGroupMessageWrap: true,
-		MessageType:          protobuf.ApplicationMetadataMessage_EMOJI_REACTION,
-		// Don't resend using datasync, that would create quite a lot
-		// of traffic if clicking too eagelry
-		ResendAutomatically: false,
-	})
-	if err != nil {
-		return nil, err
-	}
-
-	// Update MessengerResponse
-	response := MessengerResponse{}
-	emojiR.Retracted = true
-	response.AddEmojiReaction(emojiR)
-	response.AddChat(chat)
-
-	// Persist retraction state for emoji reaction
-	err = m.persistence.SaveEmojiReaction(emojiR)
-	if err != nil {
-		return nil, err
-	}
-
-	return &response, nil
-}
-
 func (m *Messenger) encodeChatEntity(chat *Chat, message common.ChatEntity) ([]byte, error) {
 	var encodedMessage []byte
 	var err error

protocol/messenger_emoji_reactions.go

@@ -0,0 +1,149 @@
+package protocol
+
+import (
+	"context"
+
+	"github.com/pkg/errors"
+
+	"github.com/status-im/status-go/eth-node/crypto"
+	"github.com/status-im/status-go/eth-node/types"
+	"github.com/status-im/status-go/protocol/common"
+	"github.com/status-im/status-go/protocol/protobuf"
+)
+
+func (m *Messenger) SendEmojiReaction(ctx context.Context, chatID, messageID string, emojiID protobuf.EmojiReaction_Type) (*MessengerResponse, error) {
+	var response MessengerResponse
+
+	chat, ok := m.allChats.Load(chatID)
+	if !ok {
+		return nil, ErrChatNotFound
+	}
+	clock, _ := chat.NextClockAndTimestamp(m.getTimesource())
+
+	emojiR := &EmojiReaction{
+		EmojiReaction: &protobuf.EmojiReaction{
+			Clock:     clock,
+			MessageId: messageID,
+			ChatId:    chatID,
+			Type:      emojiID,
+		},
+		LocalChatID: chatID,
+		From:        types.EncodeHex(crypto.FromECDSAPub(&m.identity.PublicKey)),
+	}
+	encodedMessage, err := m.encodeChatEntity(chat, emojiR)
+	if err != nil {
+		return nil, err
+	}
+
+	_, err = m.dispatchMessage(ctx, common.RawMessage{
+		LocalChatID:          chatID,
+		Payload:              encodedMessage,
+		SkipGroupMessageWrap: true,
+		MessageType:          protobuf.ApplicationMetadataMessage_EMOJI_REACTION,
+		// Don't resend using datasync, that would create quite a lot
+		// of traffic if clicking too eagelry
+		ResendAutomatically: false,
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	response.AddEmojiReaction(emojiR)
+	response.AddChat(chat)
+
+	err = m.persistence.SaveEmojiReaction(emojiR)
+	if err != nil {
+		return nil, errors.Wrap(err, "Can't save emoji reaction in db")
+	}
+
+	return &response, nil
+}
+
+func (m *Messenger) EmojiReactionsByChatID(chatID string, cursor string, limit int) ([]*EmojiReaction, error) {
+	chat, err := m.persistence.Chat(chatID)
+	if err != nil {
+		return nil, err
+	}
+
+	if chat.Timeline() {
+		var chatIDs = []string{"@" + contactIDFromPublicKey(&m.identity.PublicKey)}
+		m.allContacts.Range(func(contactID string, contact *Contact) (shouldContinue bool) {
+			if contact.added() {
+				chatIDs = append(chatIDs, "@"+contact.ID)
+			}
+			return true
+		})
+		return m.persistence.EmojiReactionsByChatIDs(chatIDs, cursor, limit)
+	}
+	return m.persistence.EmojiReactionsByChatID(chatID, cursor, limit)
+}
+
+func (m *Messenger) EmojiReactionsByChatIDMessageID(chatID string, messageID string) ([]*EmojiReaction, error) {
+	_, err := m.persistence.Chat(chatID)
+	if err != nil {
+		return nil, err
+	}
+
+	return m.persistence.EmojiReactionsByChatIDMessageID(chatID, messageID)
+}
+
+func (m *Messenger) SendEmojiReactionRetraction(ctx context.Context, emojiReactionID string) (*MessengerResponse, error) {
+	emojiR, err := m.persistence.EmojiReactionByID(emojiReactionID)
+	if err != nil {
+		return nil, err
+	}
+
+	// Check that the sender is the key owner
+	pk := types.EncodeHex(crypto.FromECDSAPub(&m.identity.PublicKey))
+	if emojiR.From != pk {
+		return nil, errors.Errorf("identity mismatch, "+
+			"emoji reactions can only be retracted by the reaction sender, "+
+			"emoji reaction sent by '%s', current identity '%s'",
+			emojiR.From, pk,
+		)
+	}
+
+	// Get chat and clock
+	chat, ok := m.allChats.Load(emojiR.GetChatId())
+	if !ok {
+		return nil, ErrChatNotFound
+	}
+	clock, _ := chat.NextClockAndTimestamp(m.getTimesource())
+
+	// Update the relevant fields
+	emojiR.Clock = clock
+	emojiR.Retracted = true
+
+	encodedMessage, err := m.encodeChatEntity(chat, emojiR)
+	if err != nil {
+		return nil, err
+	}
+
+	// Send the marshalled EmojiReactionRetraction protobuf
+	_, err = m.dispatchMessage(ctx, common.RawMessage{
+		LocalChatID:          emojiR.GetChatId(),
+		Payload:              encodedMessage,
+		SkipGroupMessageWrap: true,
+		MessageType:          protobuf.ApplicationMetadataMessage_EMOJI_REACTION,
+		// Don't resend using datasync, that would create quite a lot
+		// of traffic if clicking too eagelry
+		ResendAutomatically: false,
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	// Update MessengerResponse
+	response := MessengerResponse{}
+	emojiR.Retracted = true
+	response.AddEmojiReaction(emojiR)
+	response.AddChat(chat)
+
+	// Persist retraction state for emoji reaction
+	err = m.persistence.SaveEmojiReaction(emojiR)
+	if err != nil {
+		return nil, err
+	}
+
+	return &response, nil
+}

protocol/messenger_handler.go

@@ -393,7 +393,26 @@ func (m *Messenger) handleCommandMessage(state *ReceivedMessageState, message *c
 	if err := message.PrepareContent(common.PubkeyToHex(&m.identity.PublicKey)); err != nil {
 		return fmt.Errorf("failed to prepare content: %v", err)
 	}
-	chat, err := m.matchChatEntity(message)
+
+	// Get Application layer messageType from commandState
+	// Currently this is not really used in `matchChatEntity`, but I did want to pass UNKNOWN there.
+	var messageType protobuf.ApplicationMetadataMessage_Type
+	switch message.CommandParameters.CommandState {
+	case common.CommandStateRequestAddressForTransaction:
+		messageType = protobuf.ApplicationMetadataMessage_REQUEST_ADDRESS_FOR_TRANSACTION
+	case common.CommandStateRequestAddressForTransactionAccepted:
+		messageType = protobuf.ApplicationMetadataMessage_ACCEPT_REQUEST_ADDRESS_FOR_TRANSACTION
+	case common.CommandStateRequestAddressForTransactionDeclined:
+		messageType = protobuf.ApplicationMetadataMessage_DECLINE_REQUEST_ADDRESS_FOR_TRANSACTION
+	case common.CommandStateRequestTransaction:
+		messageType = protobuf.ApplicationMetadataMessage_REQUEST_TRANSACTION
+	case common.CommandStateRequestTransactionDeclined:
+		messageType = protobuf.ApplicationMetadataMessage_DECLINE_REQUEST_TRANSACTION
+	default:
+		messageType = protobuf.ApplicationMetadataMessage_UNKNOWN
+	}
+
+	chat, err := m.matchChatEntity(message, messageType)
 	if err != nil {
 		return err
 	}
@@ -862,7 +881,7 @@ func (m *Messenger) handlePinMessage(pinner *Contact, whisperTimestamp uint64, r
 		Alias:            pinner.Alias,
 	}
 
-	chat, err := m.matchChatEntity(pinMessage)
+	chat, err := m.matchChatEntity(pinMessage, protobuf.ApplicationMetadataMessage_PIN_MESSAGE)
 	if err != nil {
 		return err // matchChatEntity returns a descriptive error message
 	}
@@ -2127,7 +2146,7 @@ func (m *Messenger) handleChatMessage(state *ReceivedMessageState, forceSeen boo
 		}
 	}
 
-	chat, err := m.matchChatEntity(receivedMessage)
+	chat, err := m.matchChatEntity(receivedMessage, protobuf.ApplicationMetadataMessage_CHAT_MESSAGE)
 	if err != nil {
 		return err // matchChatEntity returns a descriptive error message
 	}
@@ -2684,7 +2703,7 @@ func (m *Messenger) HandleDeclineRequestTransaction(messageState *ReceivedMessag
 	return m.handleCommandMessage(messageState, oldMessage)
 }
 
-func (m *Messenger) matchChatEntity(chatEntity common.ChatEntity) (*Chat, error) {
+func (m *Messenger) matchChatEntity(chatEntity common.ChatEntity, messageType protobuf.ApplicationMetadataMessage_Type) (*Chat, error) {
 	if chatEntity.GetSigPubKey() == nil {
 		m.logger.Error("public key can't be empty")
 		return nil, errors.New("received a chatEntity with empty public key")
@@ -2753,7 +2772,7 @@ func (m *Messenger) matchChatEntity(chatEntity common.ChatEntity) (*Chat, error)
 			return nil, errors.New("not an community chat")
 		}
 
-		canPost, err := m.communitiesManager.CanPost(chatEntity.GetSigPubKey(), chat.CommunityID, chat.CommunityChatID())
+		canPost, err := m.communitiesManager.CanPost(chatEntity.GetSigPubKey(), chat.CommunityID, chat.CommunityChatID(), messageType)
 		if err != nil {
 			return nil, err
 		}
@@ -2762,21 +2781,8 @@ func (m *Messenger) matchChatEntity(chatEntity common.ChatEntity) (*Chat, error)
 			return nil, errors.New("user can't post in community")
 		}
 
-		_, isPinMessage := chatEntity.(*common.PinMessage)
-		if isPinMessage {
-			community, err := m.communitiesManager.GetByIDString(chat.CommunityID)
-			if err != nil {
-				return nil, err
-			}
-
-			hasPermission := community.IsPrivilegedMember(chatEntity.GetSigPubKey())
-			pinMessageAllowed := community.AllowsAllMembersToPinMessage()
-			if !hasPermission && !pinMessageAllowed {
-				return nil, errors.New("user can't pin message")
-			}
-		}
-
 		return chat, nil
+
 	case chatEntity.GetMessageType() == protobuf.MessageType_PRIVATE_GROUP:
 		// In the case of a group chatEntity, ChatID is the same for all messages belonging to a group.
 		// It needs to be verified if the signature public key belongs to the chat.
@@ -2853,7 +2859,7 @@ func (m *Messenger) HandleEmojiReaction(state *ReceivedMessageState, pbEmojiR *p
 		return nil
 	}
 
-	chat, err := m.matchChatEntity(emojiReaction)
+	chat, err := m.matchChatEntity(emojiReaction, protobuf.ApplicationMetadataMessage_EMOJI_REACTION)
 	if err != nil {
 		return err // matchChatEntity returns a descriptive error message
 	}

protocol/messenger_pin_messages.go

@@ -31,24 +31,6 @@ func (m *Messenger) sendPinMessage(ctx context.Context, message *common.PinMessa
 		return nil, errors.New("chat not found")
 	}
 
-	if chat.CommunityChat() {
-		community, err := m.communitiesManager.GetByIDString(chat.CommunityID)
-		if err != nil {
-			return nil, err
-		}
-
-		hasPermission := community.IsPrivilegedMember(&m.identity.PublicKey)
-		pinMessageAllowed := community.AllowsAllMembersToPinMessage()
-		canPost, err := community.CanPost(&m.identity.PublicKey, chat.CommunityChatID())
-		if err != nil {
-			return nil, err
-		}
-
-		if !canPost && !pinMessageAllowed && !hasPermission {
-			return nil, errors.New("can't pin message")
-		}
-	}
-
 	err := m.handleStandaloneChatIdentity(chat)
 	if err != nil {
 		return nil, err

protocol/protobuf/communities.proto

@@ -23,9 +23,16 @@ message CommunityMember {
     ROLE_ADMIN = 4;
     ROLE_TOKEN_MASTER = 5;
   }
+  enum ChannelRole {
+    // We make POSTER the first role to be the default one.
+    // This is for backwards compatibility. Older protobufs won't have this field and will default to 0.
+    CHANNEL_ROLE_POSTER = 0;
+    CHANNEL_ROLE_VIEWER = 1;
+  }
   repeated Roles roles = 1;
   repeated RevealedAccount revealed_accounts = 2 [deprecated = true];
   uint64 last_update_clock = 3;
+  ChannelRole channel_role = 4;
 }
 
 message CommunityTokenMetadata {
@@ -121,6 +128,7 @@ message CommunityChat {
   ChatIdentity identity = 3;
   string category_id = 4;
   int32 position = 5;
+  bool viewers_can_post_reactions = 6;
 }
 
 message CommunityCategory {

services/chat/api.go

@@ -77,7 +77,11 @@ type Chat struct {
 	FirstMessageTimestamp    uint32                             `json:"firstMessageTimestamp,omitempty"`
 	Highlight                bool                               `json:"highlight,omitempty"`
 	PinnedMessages           *PinnedMessages                    `json:"pinnedMessages,omitempty"`
+	// Deprecated: CanPost is deprecated in favor of CanPostMessages/CanPostReactions/etc.
+	// For now CanPost will equal to CanPostMessages.
 	CanPost          bool   `json:"canPost"`
+	CanPostMessages  bool   `json:"canPostMessages"`
+	CanPostReactions bool   `json:"canPostReactions"`
 	Base64Image      string `json:"image,omitempty"`
 }
 
@@ -482,7 +486,12 @@ func (chat *Chat) populateCommunityFields(community *communities.Community) erro
 		return nil
 	}
 
-	canPost, err := community.CanMemberIdentityPost(chat.ID)
+	canPostMessages, err := community.CanMemberIdentityPost(chat.ID, protobuf.ApplicationMetadataMessage_CHAT_MESSAGE)
+	if err != nil {
+		return err
+	}
+
+	canPostReactions, err := community.CanMemberIdentityPost(chat.ID, protobuf.ApplicationMetadataMessage_EMOJI_REACTION)
 	if err != nil {
 		return err
 	}
@@ -493,7 +502,9 @@ func (chat *Chat) populateCommunityFields(community *communities.Community) erro
 	chat.Emoji = commChat.Identity.Emoji
 	chat.Name = commChat.Identity.DisplayName
 	chat.Description = commChat.Identity.Description
-	chat.CanPost = canPost
+	chat.CanPost = canPostMessages
+	chat.CanPostMessages = canPostMessages
+	chat.CanPostReactions = canPostReactions
 
 	return nil
 }