171 lines
10 KiB
Swift
171 lines
10 KiB
Swift
import PromiseKit
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import SessionProtocolKit
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extension MessageSender {
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public static func createV2ClosedGroup(name: String, members: Set<String>, transaction: YapDatabaseReadWriteTransaction) -> Promise<TSGroupThread> {
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// Prepare
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var members = members
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let userPublicKey = getUserHexEncodedPublicKey()
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// Generate the group's public key
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let groupPublicKey = Curve25519.generateKeyPair().hexEncodedPublicKey // Includes the "05" prefix
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// Generate the key pair that'll be used for encryption and decryption
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let encryptionKeyPair = Curve25519.generateKeyPair()
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// Ensure the current user is included in the member list
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members.insert(userPublicKey)
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let membersAsData = members.map { Data(hex: $0) }
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// Create the group
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let admins = [ userPublicKey ]
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let adminsAsData = admins.map { Data(hex: $0) }
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let groupID = LKGroupUtilities.getEncodedClosedGroupIDAsData(groupPublicKey)
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let group = TSGroupModel(title: name, memberIds: [String](members), image: nil, groupId: groupID, groupType: .closedGroup, adminIds: admins)
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let thread = TSGroupThread.getOrCreateThread(with: group, transaction: transaction)
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thread.save(with: transaction)
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// Send a closed group update message to all members individually
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var promises: [Promise<Void>] = []
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for member in members {
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guard member != userPublicKey else { continue }
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let thread = TSContactThread.getOrCreateThread(withContactId: member, transaction: transaction)
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thread.save(with: transaction)
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let closedGroupUpdateKind = ClosedGroupUpdate.Kind.new(publicKey: Data(hex: groupPublicKey), name: name,
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encryptionKeyPair: encryptionKeyPair, members: membersAsData, admins: adminsAsData)
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let closedGroupUpdate = ClosedGroupUpdate(kind: closedGroupUpdateKind)
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let promise = MessageSender.sendNonDurably(closedGroupUpdate, in: thread, using: transaction)
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promises.append(promise)
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}
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// Add the group to the user's set of public keys to poll for
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Storage.shared.addClosedGroupPublicKey(groupPublicKey, using: transaction)
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// Store the key pair
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Storage.shared.addClosedGroupEncryptionKeyPair(encryptionKeyPair, for: groupPublicKey, using: transaction)
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// Notify the PN server
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promises.append(PushNotificationAPI.performOperation(.subscribe, for: groupPublicKey, publicKey: userPublicKey))
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// Notify the user
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let infoMessage = TSInfoMessage(timestamp: NSDate.ows_millisecondTimeStamp(), in: thread, messageType: .typeGroupUpdate)
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infoMessage.save(with: transaction)
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// Return
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return when(fulfilled: promises).map2 { thread }
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}
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public static func updateV2(_ groupPublicKey: String, with members: Set<String>, name: String, transaction: YapDatabaseReadWriteTransaction) throws {
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// Prepare
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let userPublicKey = getUserHexEncodedPublicKey()
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let groupID = LKGroupUtilities.getEncodedClosedGroupIDAsData(groupPublicKey)
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let threadID = TSGroupThread.threadId(fromGroupId: groupID)
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guard let thread = TSGroupThread.fetch(uniqueId: threadID, transaction: transaction) else {
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SNLog("Can't update nonexistent closed group.")
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throw Error.noThread
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}
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let group = thread.groupModel
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let oldMembers = Set(group.groupMemberIds)
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let newMembers = members.subtracting(oldMembers)
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let membersAsData = members.map { Data(hex: $0) }
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let removedMembers = oldMembers.subtracting(members)
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let admins = group.groupAdminIds
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let adminsAsData = admins.map { Data(hex: $0) }
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let isUserLeaving = !members.contains(userPublicKey)
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let wasAnyUserRemoved = !removedMembers.isEmpty
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let isCurrentUserAdmin = group.groupAdminIds.contains(getUserHexEncodedPublicKey())
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// Check preconditions
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guard let encryptionKeyPair = Storage.shared.getLatestClosedGroupEncryptionKeyPair(for: groupPublicKey) else {
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SNLog("Couldn't get key pair for closed group.")
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throw Error.noKeyPair
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}
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if removedMembers.contains(admins.first!) && !members.isEmpty {
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SNLog("Can't remove admin from closed group without removing everyone.")
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throw Error.invalidClosedGroupUpdate
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}
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if isUserLeaving && !members.isEmpty {
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guard removedMembers.count == 1 && newMembers.isEmpty else {
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SNLog("Can't remove self and add or remove others simultaneously.")
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throw Error.invalidClosedGroupUpdate
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}
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}
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// Send the update to the group
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let mainClosedGroupUpdate = ClosedGroupUpdate(kind: .update(name: name, members: membersAsData))
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if isUserLeaving {
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let _ = MessageSender.sendNonDurably(mainClosedGroupUpdate, in: thread, using: transaction).done {
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SNMessagingKitConfiguration.shared.storage.write { transaction in
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// Remove the group from the database and unsubscribe from PNs
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Storage.shared.removeAllClosedGroupEncryptionKeyPairs(for: groupPublicKey, using: transaction)
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Storage.shared.removeClosedGroupPublicKey(groupPublicKey, using: transaction)
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let _ = PushNotificationAPI.performOperation(.unsubscribe, for: groupPublicKey, publicKey: userPublicKey)
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}
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}
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} else {
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MessageSender.send(mainClosedGroupUpdate, in: thread, using: transaction)
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// Generate and distribute a new encryption key pair if needed
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if wasAnyUserRemoved && isCurrentUserAdmin {
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try generateAndSendNewEncryptionKeyPair(for: groupPublicKey, to: members.subtracting(newMembers), using: transaction)
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}
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// Send closed group update messages to any new members individually
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for member in newMembers {
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let thread = TSContactThread.getOrCreateThread(withContactId: member, transaction: transaction)
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thread.save(with: transaction)
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let closedGroupUpdateKind = ClosedGroupUpdate.Kind.new(publicKey: Data(hex: groupPublicKey), name: name,
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encryptionKeyPair: encryptionKeyPair, members: membersAsData, admins: adminsAsData)
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let closedGroupUpdate = ClosedGroupUpdate(kind: closedGroupUpdateKind)
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MessageSender.send(closedGroupUpdate, in: thread, using: transaction)
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}
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}
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// Update the group
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let newGroupModel = TSGroupModel(title: name, memberIds: [String](members), image: nil, groupId: groupID, groupType: .closedGroup, adminIds: admins)
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thread.setGroupModel(newGroupModel, with: transaction)
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// Notify the user
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let updateInfo = group.getInfoStringAboutUpdate(to: newGroupModel)
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let infoMessage = TSInfoMessage(timestamp: NSDate.ows_millisecondTimeStamp(), in: thread, messageType: .typeGroupUpdate, customMessage: updateInfo)
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infoMessage.save(with: transaction)
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}
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@objc(leaveClosedGroupWithPublicKey:using:error:)
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public static func leaveV2(_ groupPublicKey: String, using transaction: YapDatabaseReadWriteTransaction) throws {
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let groupID = LKGroupUtilities.getEncodedClosedGroupIDAsData(groupPublicKey)
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let threadID = TSGroupThread.threadId(fromGroupId: groupID)
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guard let thread = TSGroupThread.fetch(uniqueId: threadID, transaction: transaction) else {
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SNLog("Can't leave nonexistent closed group.")
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throw Error.noThread
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}
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let group = thread.groupModel
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let isCurrentUserAdmin = group.groupAdminIds.contains(getUserHexEncodedPublicKey())
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var newMembers: Set<String>
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if !isCurrentUserAdmin {
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newMembers = Set(group.groupMemberIds)
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newMembers.remove(getUserHexEncodedPublicKey())
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} else {
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newMembers = [] // If the admin leaves the group is destroyed
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}
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return try updateV2(groupPublicKey, with: newMembers, name: group.groupName!, transaction: transaction)
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}
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public static func generateAndSendNewEncryptionKeyPair(for groupPublicKey: String, to targetMembers: Set<String>, using transaction: Any) throws {
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// Prepare
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let transaction = transaction as! YapDatabaseReadWriteTransaction
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let groupID = LKGroupUtilities.getEncodedClosedGroupIDAsData(groupPublicKey)
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let threadID = TSGroupThread.threadId(fromGroupId: groupID)
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guard let thread = TSGroupThread.fetch(uniqueId: threadID, transaction: transaction) else {
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SNLog("Can't distribute new encryption key pair for nonexistent closed group.")
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throw Error.noThread
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}
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guard thread.groupModel.groupAdminIds.contains(getUserHexEncodedPublicKey()) else {
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SNLog("Can't distribute new encryption key pair as a non-admin.")
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throw Error.invalidClosedGroupUpdate
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}
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// Generate the new encryption key pair
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let newKeyPair = Curve25519.generateKeyPair()
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// Distribute it
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let proto = try SNProtoDataMessageClosedGroupUpdateV2KeyPair.builder(publicKey: newKeyPair.publicKey,
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privateKey: newKeyPair.privateKey).build()
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let plaintext = try proto.serializedData()
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let wrappers = try targetMembers.compactMap { publicKey -> ClosedGroupUpdate.KeyPairWrapper in
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let ciphertext = try MessageSender.encryptWithSessionProtocol(plaintext, for: publicKey)
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return ClosedGroupUpdate.KeyPairWrapper(publicKey: publicKey, encryptedKeyPair: ciphertext)
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}
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let closedGroupUpdate = ClosedGroupUpdate(kind: .encryptionKeyPair(wrappers))
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let _ = MessageSender.sendNonDurably(closedGroupUpdate, in: thread, using: transaction).done { // FIXME: It'd be great if we could make this a durable operation
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// Store it * after * having sent out the message to the group
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SNMessagingKitConfiguration.shared.storage.write { transaction in
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Storage.shared.addClosedGroupEncryptionKeyPair(newKeyPair, for: groupPublicKey, using: transaction)
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}
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}
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}
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}
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