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Fix SSK based closed group leaving

Browse Source
pull/247/head
nielsandriesse 5 years ago
parent a666776c88
commit c2c8d68f5d
2 changed files with 43 additions and 19 deletions
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16
Signal/src/Loki/View Controllers/HomeVC.swift
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@ -412,9 +412,21 @@ final class HomeVC : BaseVC, UITableViewDataSource, UITableViewDelegate, UIScrol
transaction.removeObject(forKey: "\(publicChat.server).\(publicChat.channel)", inCollection: PublicChatAPI.lastMessageServerIDCollection)
transaction.removeObject(forKey: "\(publicChat.server).\(publicChat.channel)", inCollection: PublicChatAPI.lastDeletionServerIDCollection)
let _ = PublicChatAPI.leave(publicChat.channel, on: publicChat.server)
thread.removeAllThreadInteractions(with: transaction)
thread.remove(with: transaction)
} else if let thread = thread as? TSGroupThread, thread.usesSharedSenderKeys == true {
let groupID = thread.groupModel.groupId
let groupPublicKey = LKGroupUtilities.getDecodedGroupID(groupID)
let _ = ClosedGroupsProtocol.leave(groupPublicKey, using: transaction).ensure {
try! Storage.writeSync { transaction in
thread.removeAllThreadInteractions(with: transaction)
thread.remove(with: transaction)
}
}
} else {
thread.removeAllThreadInteractions(with: transaction)
thread.remove(with: transaction)
}
thread.removeAllThreadInteractions(with: transaction)
thread.remove(with: transaction)
}
NotificationCenter.default.post(name: .threadDeleted, object: nil, userInfo: [ "threadId" : thread.uniqueId! ])
})

46
SignalServiceKit/src/Loki/Protocol/Closed Groups/ClosedGroupsProtocol.swift
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@ -124,22 +124,25 @@ public final class ClosedGroupsProtocol : NSObject {
infoMessage.save(with: transaction)
}
public static func leave(_ groupPublicKey: String, using transaction: YapDatabaseReadWriteTransaction) {
public static func leave(_ groupPublicKey: String, using transaction: YapDatabaseReadWriteTransaction) -> Promise<Void> {
let userPublicKey = UserDefaults.standard[.masterHexEncodedPublicKey] ?? getUserHexEncodedPublicKey()
removeMembers([ userPublicKey ], from: groupPublicKey, using: transaction)
return removeMembers([ userPublicKey ], from: groupPublicKey, using: transaction)
}
public static func removeMembers(_ membersToRemove: Set<String>, from groupPublicKey: String, using transaction: YapDatabaseReadWriteTransaction) {
/// The returned promise is fulfilled when the message has been sent **to the group**. It doesn't wait for the user's new ratchet to be distributed.
public static func removeMembers(_ membersToRemove: Set<String>, from groupPublicKey: String, using transaction: YapDatabaseReadWriteTransaction) -> Promise<Void> {
// Prepare
let userPublicKey = UserDefaults.standard[.masterHexEncodedPublicKey] ?? getUserHexEncodedPublicKey()
let isUserLeaving = membersToRemove.contains(userPublicKey)
guard !isUserLeaving || membersToRemove.count == 1 else {
return print("[Loki] Can't remove self and others simultaneously.")
print("[Loki] Can't remove self and others simultaneously.")
return Promise.value(())
}
let messageSenderJobQueue = SSKEnvironment.shared.messageSenderJobQueue
let groupID = LKGroupUtilities.getEncodedClosedGroupIDAsData(groupPublicKey)
guard let thread = TSGroupThread.fetch(uniqueId: TSGroupThread.threadId(fromGroupId: groupID), transaction: transaction) else {
return print("[Loki] Can't remove users from nonexistent closed group.")
print("[Loki] Can't remove users from nonexistent closed group.")
return Promise.value(())
}
let group = thread.groupModel
let name = group.groupName!
@ -149,7 +152,8 @@ public final class ClosedGroupsProtocol : NSObject {
var members = group.groupMemberIds
let indexes = membersToRemove.compactMap { members.firstIndex(of: $0) }
guard indexes.count == membersToRemove.count else {
return print("[Loki] Can't remove users from group.")
print("[Loki] Can't remove users from group.")
return Promise.value(())
}
indexes.forEach { members.remove(at: $0) }
let membersAsData = members.map { Data(hex: $0) }
@ -157,14 +161,20 @@ public final class ClosedGroupsProtocol : NSObject {
let closedGroupUpdateMessageKind = ClosedGroupUpdateMessage.Kind.info(groupPublicKey: Data(hex: groupPublicKey), name: name, senderKeys: [],
members: membersAsData, admins: adminsAsData)
let closedGroupUpdateMessage = ClosedGroupUpdateMessage(thread: thread, kind: closedGroupUpdateMessageKind)
messageSenderJobQueue.add(message: closedGroupUpdateMessage, transaction: transaction)
// Delete all ratchets (it's important that this happens after sending out the update)
Storage.removeAllClosedGroupRatchets(for: groupPublicKey, using: transaction)
// Remove the group from the user's set of public keys to poll for if the user is leaving. Otherwise generate a new ratchet and send it out to all
// members (minus the removed ones) and their linked devices using established channels.
if isUserLeaving {
Storage.removeClosedGroupPrivateKey(for: groupPublicKey, using: transaction)
} else {
let (promise, seal) = Promise<Void>.pending()
SSKEnvironment.shared.messageSender.send(closedGroupUpdateMessage, success: { seal.fulfill(()) }, failure: { seal.reject($0) })
promise.done {
try! Storage.writeSync { transaction in
// Delete all ratchets (it's important that this happens after sending out the update)
Storage.removeAllClosedGroupRatchets(for: groupPublicKey, using: transaction)
// Remove the group from the user's set of public keys to poll for
if isUserLeaving {
Storage.removeClosedGroupPrivateKey(for: groupPublicKey, using: transaction)
}
}
}
// Generate a new ratchet and send it out to all members (minus the removed ones) and their linked devices using established channels if needed.
if !isUserLeaving {
// Establish sessions if needed
establishSessionsIfNeeded(with: members, using: transaction) // This internally takes care of multi device
// Send out the user's new ratchet to all members (minus the removed ones) and their linked devices using established channels
@ -186,6 +196,8 @@ public final class ClosedGroupsProtocol : NSObject {
let infoMessageType: TSInfoMessageType = isUserLeaving ? .typeGroupQuit : .typeGroupUpdate
let infoMessage = TSInfoMessage(timestamp: NSDate.ows_millisecondTimeStamp(), in: thread, messageType: infoMessageType)
infoMessage.save(with: transaction)
// Return
return promise
}
public static func requestSenderKey(for groupPublicKey: String, senderPublicKey: String, using transaction: YapDatabaseReadWriteTransaction) {
@ -274,7 +286,7 @@ public final class ClosedGroupsProtocol : NSObject {
}
let group = thread.groupModel
// Check that the sender is a member of the group (before the update)
var membersAndLinkedDevices: Set<String> = []
var membersAndLinkedDevices: Set<String> = Set(group.groupMemberIds)
for member in group.groupMemberIds {
let deviceLinks = OWSPrimaryStorage.shared().getDeviceLinks(for: member, in: transaction)
membersAndLinkedDevices.formUnion(deviceLinks.flatMap { [ $0.master.publicKey, $0.slave.publicKey ] })
@ -333,7 +345,7 @@ public final class ClosedGroupsProtocol : NSObject {
}
let group = groupThread.groupModel
// Check that the requesting user is a member of the group
var membersAndLinkedDevices: Set<String> = []
var membersAndLinkedDevices: Set<String> = Set(group.groupMemberIds)
for member in group.groupMemberIds {
let deviceLinks = OWSPrimaryStorage.shared().getDeviceLinks(for: member, in: transaction)
membersAndLinkedDevices.formUnion(deviceLinks.flatMap { [ $0.master.publicKey, $0.slave.publicKey ] })
@ -365,7 +377,7 @@ public final class ClosedGroupsProtocol : NSObject {
return print("[Loki] Ignoring invalid closed group sender key.")
}
// Check that the requesting user is a member of the group
var membersAndLinkedDevices: Set<String> = []
var membersAndLinkedDevices: Set<String> = Set(group.groupMemberIds)
for member in group.groupMemberIds {
let deviceLinks = OWSPrimaryStorage.shared().getDeviceLinks(for: member, in: transaction)
membersAndLinkedDevices.formUnion(deviceLinks.flatMap { [ $0.master.publicKey, $0.slave.publicKey ] })

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