218 lines
10 KiB
Swift
218 lines
10 KiB
Swift
import SessionProtocolKit
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import SessionUtilitiesKit
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public final class ClosedGroupUpdateV2 : ControlMessage {
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public var kind: Kind?
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public override var ttl: UInt64 {
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switch kind {
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case .encryptionKeyPair: return 4 * 24 * 60 * 60 * 1000
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default: return 2 * 24 * 60 * 60 * 1000
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}
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}
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// MARK: Kind
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public enum Kind : CustomStringConvertible {
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case new(publicKey: Data, name: String, encryptionKeyPair: ECKeyPair, members: [Data], admins: [Data])
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case update(name: String, members: [Data])
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case encryptionKeyPair([KeyPairWrapper]) // The new encryption key pair encrypted for each member individually
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public var description: String {
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switch self {
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case .new: return "new"
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case .update: return "update"
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case .encryptionKeyPair: return "encryptionKeyPair"
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}
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}
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}
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// MARK: Key Pair Wrapper
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@objc(SNKeyPairWrapper)
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public final class KeyPairWrapper : NSObject, NSCoding { // NSObject/NSCoding conformance is needed for YapDatabase compatibility
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public var publicKey: String?
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public var encryptedKeyPair: Data?
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public var isValid: Bool { publicKey != nil && encryptedKeyPair != nil }
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public init(publicKey: String, encryptedKeyPair: Data) {
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self.publicKey = publicKey
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self.encryptedKeyPair = encryptedKeyPair
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}
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public required init?(coder: NSCoder) {
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if let publicKey = coder.decodeObject(forKey: "publicKey") as! String? { self.publicKey = publicKey }
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if let encryptedKeyPair = coder.decodeObject(forKey: "encryptedKeyPair") as! Data? { self.encryptedKeyPair = encryptedKeyPair }
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}
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public func encode(with coder: NSCoder) {
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coder.encode(publicKey, forKey: "publicKey")
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coder.encode(encryptedKeyPair, forKey: "encryptedKeyPair")
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}
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public static func fromProto(_ proto: SNProtoDataMessageClosedGroupUpdateV2KeyPairWrapper) -> KeyPairWrapper? {
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return KeyPairWrapper(publicKey: proto.publicKey.toHexString(), encryptedKeyPair: proto.encryptedKeyPair)
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}
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public func toProto() -> SNProtoDataMessageClosedGroupUpdateV2KeyPairWrapper? {
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guard let publicKey = publicKey, let encryptedKeyPair = encryptedKeyPair else { return nil }
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let result = SNProtoDataMessageClosedGroupUpdateV2KeyPairWrapper.builder(publicKey: Data(hex: publicKey), encryptedKeyPair: encryptedKeyPair)
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do {
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return try result.build()
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} catch {
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SNLog("Couldn't construct key pair wrapper proto from: \(self).")
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return nil
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}
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}
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}
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// MARK: Initialization
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public override init() { super.init() }
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internal init(kind: Kind) {
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super.init()
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self.kind = kind
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}
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// MARK: Validation
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public override var isValid: Bool {
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guard super.isValid, let kind = kind else { return false }
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switch kind {
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case .new(let publicKey, let name, let encryptionKeyPair, let members, let admins):
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return !publicKey.isEmpty && !name.isEmpty && !encryptionKeyPair.publicKey.isEmpty
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&& !encryptionKeyPair.privateKey.isEmpty && !members.isEmpty && !admins.isEmpty
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case .update(let name, let members):
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return !name.isEmpty && !members.isEmpty
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case .encryptionKeyPair: return true
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}
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}
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// MARK: Coding
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public required init?(coder: NSCoder) {
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super.init(coder: coder)
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guard let rawKind = coder.decodeObject(forKey: "kind") as? String else { return nil }
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switch rawKind {
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case "new":
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guard let publicKey = coder.decodeObject(forKey: "publicKey") as? Data,
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let name = coder.decodeObject(forKey: "name") as? String,
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let encryptionKeyPair = coder.decodeObject(forKey: "encryptionKeyPair") as? ECKeyPair,
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let members = coder.decodeObject(forKey: "members") as? [Data],
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let admins = coder.decodeObject(forKey: "admins") as? [Data] else { return nil }
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self.kind = .new(publicKey: publicKey, name: name, encryptionKeyPair: encryptionKeyPair, members: members, admins: admins)
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case "update":
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guard let name = coder.decodeObject(forKey: "name") as? String,
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let members = coder.decodeObject(forKey: "members") as? [Data] else { return nil }
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self.kind = .update(name: name, members: members)
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case "encryptionKeyPair":
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guard let wrappers = coder.decodeObject(forKey: "wrappers") as? [KeyPairWrapper] else { return nil }
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self.kind = .encryptionKeyPair(wrappers)
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default: return nil
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}
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}
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public override func encode(with coder: NSCoder) {
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super.encode(with: coder)
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guard let kind = kind else { return }
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switch kind {
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case .new(let publicKey, let name, let encryptionKeyPair, let members, let admins):
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coder.encode("new", forKey: "kind")
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coder.encode(publicKey, forKey: "publicKey")
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coder.encode(name, forKey: "name")
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coder.encode(encryptionKeyPair, forKey: "encryptionKeyPair")
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coder.encode(members, forKey: "members")
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coder.encode(admins, forKey: "admins")
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case .update(let name, let members):
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coder.encode("update", forKey: "kind")
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coder.encode(name, forKey: "name")
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coder.encode(members, forKey: "members")
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case .encryptionKeyPair(let wrappers):
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coder.encode("encryptionKeyPair", forKey: "kind")
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coder.encode(wrappers, forKey: "wrappers")
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}
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}
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// MARK: Proto Conversion
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public override class func fromProto(_ proto: SNProtoContent) -> ClosedGroupUpdateV2? {
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guard let closedGroupUpdateProto = proto.dataMessage?.closedGroupUpdateV2 else { return nil }
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let kind: Kind
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switch closedGroupUpdateProto.type {
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case .new:
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guard let publicKey = closedGroupUpdateProto.publicKey, let name = closedGroupUpdateProto.name,
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let encryptionKeyPairAsProto = closedGroupUpdateProto.encryptionKeyPair else { return nil }
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do {
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let encryptionKeyPair = try ECKeyPair(publicKeyData: encryptionKeyPairAsProto.publicKey, privateKeyData: encryptionKeyPairAsProto.privateKey)
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kind = .new(publicKey: publicKey, name: name, encryptionKeyPair: encryptionKeyPair,
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members: closedGroupUpdateProto.members, admins: closedGroupUpdateProto.admins)
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} catch {
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SNLog("Couldn't parse key pair.")
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return nil
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}
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case .update:
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guard let name = closedGroupUpdateProto.name else { return nil }
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kind = .update(name: name, members: closedGroupUpdateProto.members)
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case .encryptionKeyPair:
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let wrappers = closedGroupUpdateProto.wrappers.compactMap { KeyPairWrapper.fromProto($0) }
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kind = .encryptionKeyPair(wrappers)
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}
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return ClosedGroupUpdateV2(kind: kind)
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}
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public override func toProto(using transaction: YapDatabaseReadWriteTransaction) -> SNProtoContent? {
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guard let kind = kind else {
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SNLog("Couldn't construct closed group update proto from: \(self).")
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return nil
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}
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do {
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let closedGroupUpdate: SNProtoDataMessageClosedGroupUpdateV2.SNProtoDataMessageClosedGroupUpdateV2Builder
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switch kind {
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case .new(let publicKey, let name, let encryptionKeyPair, let members, let admins):
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closedGroupUpdate = SNProtoDataMessageClosedGroupUpdateV2.builder(type: .new)
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closedGroupUpdate.setPublicKey(publicKey)
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closedGroupUpdate.setName(name)
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let encryptionKeyPairAsProto = SNProtoDataMessageClosedGroupUpdateV2KeyPair.builder(publicKey: encryptionKeyPair.publicKey, privateKey: encryptionKeyPair.privateKey)
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do {
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closedGroupUpdate.setEncryptionKeyPair(try encryptionKeyPairAsProto.build())
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} catch {
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SNLog("Couldn't construct closed group update proto from: \(self).")
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return nil
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}
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closedGroupUpdate.setMembers(members)
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closedGroupUpdate.setAdmins(admins)
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case .update(let name, let members):
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closedGroupUpdate = SNProtoDataMessageClosedGroupUpdateV2.builder(type: .update)
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closedGroupUpdate.setName(name)
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closedGroupUpdate.setMembers(members)
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case .encryptionKeyPair(let wrappers):
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closedGroupUpdate = SNProtoDataMessageClosedGroupUpdateV2.builder(type: .encryptionKeyPair)
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closedGroupUpdate.setWrappers(wrappers.compactMap { $0.toProto() })
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}
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let contentProto = SNProtoContent.builder()
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let dataMessageProto = SNProtoDataMessage.builder()
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dataMessageProto.setClosedGroupUpdateV2(try closedGroupUpdate.build())
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// Group context
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try setGroupContextIfNeeded(on: dataMessageProto, using: transaction)
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// Expiration timer
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// TODO: We * want * expiration timer updates to be explicit. But currently Android will disable the expiration timer for a conversation
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// if it receives a message without the current expiration timer value attached to it...
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var expiration: UInt32 = 0
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if let disappearingMessagesConfiguration = OWSDisappearingMessagesConfiguration.fetch(uniqueId: threadID!, transaction: transaction) {
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expiration = disappearingMessagesConfiguration.isEnabled ? disappearingMessagesConfiguration.durationSeconds : 0
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}
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dataMessageProto.setExpireTimer(expiration)
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contentProto.setDataMessage(try dataMessageProto.build())
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return try contentProto.build()
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} catch {
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SNLog("Couldn't construct closed group update proto from: \(self).")
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return nil
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}
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}
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// MARK: Description
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public override var description: String {
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"""
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ClosedGroupUpdate(
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kind: \(kind?.description ?? "null")
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)
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"""
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}
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}
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