320 lines
16 KiB
Swift
320 lines
16 KiB
Swift
import PromiseKit
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import SessionSnodeKit
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import SessionUtilitiesKit
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@objc(SNMessageSender)
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public final class MessageSender : NSObject {
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// MARK: Error
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public enum Error : LocalizedError {
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case invalidMessage
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case protoConversionFailed
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case proofOfWorkCalculationFailed
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case noUserPublicKey
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// Closed groups
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case noThread
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case noPrivateKey
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case invalidClosedGroupUpdate
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internal var isRetryable: Bool {
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switch self {
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case .invalidMessage, .protoConversionFailed, .proofOfWorkCalculationFailed, .invalidClosedGroupUpdate: return false
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default: return true
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}
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}
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public var errorDescription: String? {
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switch self {
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case .invalidMessage: return "Invalid message."
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case .protoConversionFailed: return "Couldn't convert message to proto."
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case .proofOfWorkCalculationFailed: return "Proof of work calculation failed."
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case .noUserPublicKey: return "Couldn't find user key pair."
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// Closed groups
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case .noThread: return "Couldn't find a thread associated with the given group public key."
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case .noPrivateKey: return "Couldn't find a private key associated with the given group public key."
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case .invalidClosedGroupUpdate: return "Invalid group update."
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}
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}
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}
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// MARK: Initialization
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private override init() { }
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public static let shared = MessageSender() // FIXME: Remove once requestSenderKey is static
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// MARK: Preparation
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public static func prep(_ signalAttachments: [SignalAttachment], for message: VisibleMessage, using transaction: YapDatabaseReadWriteTransaction) {
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guard let tsMessage = TSOutgoingMessage.find(withTimestamp: message.sentTimestamp!) else {
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#if DEBUG
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preconditionFailure()
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#else
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return
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#endif
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}
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var attachments: [TSAttachmentStream] = []
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signalAttachments.forEach {
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let attachment = TSAttachmentStream(contentType: $0.mimeType, byteCount: UInt32($0.dataLength), sourceFilename: $0.sourceFilename,
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caption: $0.captionText, albumMessageId: tsMessage.uniqueId!)
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attachments.append(attachment)
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attachment.write($0.dataSource)
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attachment.save(with: transaction)
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}
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// The line below locally generates a thumbnail for the quoted attachment. It just needs to happen at some point during the
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// message sending process.
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tsMessage.quotedMessage?.createThumbnailAttachmentsIfNecessary(with: transaction)
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var linkPreviewAttachmentID: String?
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if let id = tsMessage.linkPreview?.imageAttachmentId,
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let attachment = TSAttachment.fetch(uniqueId: id, transaction: transaction) as? TSAttachmentStream {
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linkPreviewAttachmentID = id
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attachments.append(attachment)
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}
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// Anything added to message.attachmentIDs will be uploaded by an UploadAttachmentJob. Any attachment IDs added to tsMessage will
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// make it render as an attachment (not what we want in the case of a link preview or quoted attachment).
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message.attachmentIDs = attachments.map { $0.uniqueId! }
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tsMessage.attachmentIds.addObjects(from: message.attachmentIDs)
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if let id = linkPreviewAttachmentID { tsMessage.attachmentIds.remove(id) }
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tsMessage.save(with: transaction)
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}
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// MARK: Convenience
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public static func send(_ message: Message, to destination: Message.Destination, using transaction: Any) -> Promise<Void> {
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switch destination {
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case .contact(_), .closedGroup(_): return sendToSnodeDestination(destination, message: message, using: transaction)
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case .openGroup(_, _): return sendToOpenGroupDestination(destination, message: message, using: transaction)
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}
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}
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// MARK: One-on-One Chats & Closed Groups
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internal static func sendToSnodeDestination(_ destination: Message.Destination, message: Message, using transaction: Any) -> Promise<Void> {
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let (promise, seal) = Promise<Void>.pending()
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let storage = SNMessagingKitConfiguration.shared.storage
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if message.sentTimestamp == nil { // Visible messages will already have their sent timestamp set
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message.sentTimestamp = NSDate.millisecondTimestamp()
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}
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let userPublicKey = storage.getUserPublicKey()
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message.sender = userPublicKey
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switch destination {
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case .contact(let publicKey): message.recipient = publicKey
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case .closedGroup(let groupPublicKey): message.recipient = groupPublicKey
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case .openGroup(_, _): preconditionFailure()
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}
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let isSelfSend = (message.recipient == userPublicKey)
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// Set the failure handler (for precondition failure handling)
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let _ = promise.catch(on: DispatchQueue.main) { error in
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storage.withAsync({ transaction in
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MessageSender.handleFailedMessageSend(message, with: error, using: transaction)
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}, completion: { })
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if case .contact(_) = destination, message is VisibleMessage, !isSelfSend {
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NotificationCenter.default.post(name: .messageSendingFailed, object: NSNumber(value: message.sentTimestamp!))
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}
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}
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// Validate the message
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guard message.isValid else { seal.reject(Error.invalidMessage); return promise }
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// Stop here if this is a self-send
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guard !isSelfSend else {
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storage.withAsync({ transaction in
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MessageSender.handleSuccessfulMessageSend(message, to: destination, using: transaction)
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}, completion: { })
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seal.fulfill(())
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return promise
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}
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// Attach the user's profile if needed
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if let message = message as? VisibleMessage {
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let displayName = storage.getUserDisplayName()!
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if let profileKey = storage.getUserProfileKey(), let profilePictureURL = storage.getUserProfilePictureURL() {
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message.profile = VisibleMessage.Profile(displayName: displayName, profileKey: profileKey, profilePictureURL: profilePictureURL)
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} else {
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message.profile = VisibleMessage.Profile(displayName: displayName)
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}
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}
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// Convert it to protobuf
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let protoOrNil: SNProtoContent?
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if let message = message as? VisibleMessage {
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protoOrNil = message.toProto(using: transaction as! YapDatabaseReadWriteTransaction) // Needed because of how TSAttachmentStream works
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} else {
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protoOrNil = message.toProto()
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}
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guard let proto = protoOrNil else { seal.reject(Error.protoConversionFailed); return promise }
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// Serialize the protobuf
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let plaintext: Data
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do {
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plaintext = try proto.serializedData()
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} catch {
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SNLog("Couldn't serialize proto due to error: \(error).")
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seal.reject(error)
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return promise
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}
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// Encrypt the serialized protobuf
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if case .contact(_) = destination, message is VisibleMessage, !isSelfSend {
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DispatchQueue.main.async {
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NotificationCenter.default.post(name: .encryptingMessage, object: NSNumber(value: message.sentTimestamp!))
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}
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}
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let ciphertext: Data
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do {
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switch destination {
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case .contact(let publicKey): ciphertext = try encryptWithSignalProtocol(plaintext, associatedWith: message, for: publicKey, using: transaction)
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case .closedGroup(let groupPublicKey): ciphertext = try encryptWithSharedSenderKeys(plaintext, for: groupPublicKey, using: transaction)
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case .openGroup(_, _): preconditionFailure()
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}
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} catch {
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SNLog("Couldn't encrypt message for destination: \(destination) due to error: \(error).")
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seal.reject(error)
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return promise
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}
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// Wrap the result
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let kind: SNProtoEnvelope.SNProtoEnvelopeType
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let senderPublicKey: String
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switch destination {
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case .contact(_):
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kind = .unidentifiedSender
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senderPublicKey = ""
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case .closedGroup(let groupPublicKey):
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kind = .closedGroupCiphertext
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senderPublicKey = groupPublicKey
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case .openGroup(_, _): preconditionFailure()
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}
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let wrappedMessage: Data
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do {
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wrappedMessage = try MessageWrapper.wrap(type: kind, timestamp: message.sentTimestamp!,
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senderPublicKey: senderPublicKey, base64EncodedContent: ciphertext.base64EncodedString())
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} catch {
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SNLog("Couldn't wrap message due to error: \(error).")
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seal.reject(error)
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return promise
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}
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// Calculate proof of work
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if case .contact(_) = destination, message is VisibleMessage, !isSelfSend {
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DispatchQueue.main.async {
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NotificationCenter.default.post(name: .calculatingMessagePoW, object: NSNumber(value: message.sentTimestamp!))
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}
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}
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let recipient = message.recipient!
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let base64EncodedData = wrappedMessage.base64EncodedString()
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guard let (timestamp, nonce) = ProofOfWork.calculate(ttl: type(of: message).ttl, publicKey: recipient, data: base64EncodedData) else {
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SNLog("Proof of work calculation failed.")
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seal.reject(Error.proofOfWorkCalculationFailed)
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return promise
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}
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// Send the result
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if case .contact(_) = destination, message is VisibleMessage, !isSelfSend {
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DispatchQueue.main.async {
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NotificationCenter.default.post(name: .messageSending, object: NSNumber(value: message.sentTimestamp!))
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}
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}
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let snodeMessage = SnodeMessage(recipient: recipient, data: base64EncodedData, ttl: type(of: message).ttl, timestamp: timestamp, nonce: nonce)
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SnodeAPI.sendMessage(snodeMessage).done(on: DispatchQueue.global(qos: .userInitiated)) { promises in
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var isSuccess = false
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let promiseCount = promises.count
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var errorCount = 0
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promises.forEach {
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let _ = $0.done(on: DispatchQueue.global(qos: .userInitiated)) { _ in
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guard !isSuccess else { return } // Succeed as soon as the first promise succeeds
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isSuccess = true
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seal.fulfill(())
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}
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$0.catch(on: DispatchQueue.global(qos: .userInitiated)) { error in
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errorCount += 1
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guard errorCount == promiseCount else { return } // Only error out if all promises failed
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seal.reject(error)
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}
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}
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}.catch(on: DispatchQueue.global(qos: .userInitiated)) { error in
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SNLog("Couldn't send message due to error: \(error).")
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seal.reject(error)
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}
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// Handle completion
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let _ = promise.done(on: DispatchQueue.main) {
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storage.withAsync({ transaction in
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MessageSender.handleSuccessfulMessageSend(message, to: destination, using: transaction)
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}, completion: { })
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if case .contact(_) = destination, message is VisibleMessage, !isSelfSend {
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NotificationCenter.default.post(name: .messageSent, object: NSNumber(value: message.sentTimestamp!))
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}
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if message is VisibleMessage {
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let notifyPNServerJob = NotifyPNServerJob(message: snodeMessage)
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storage.withAsync({ transaction in
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JobQueue.shared.add(notifyPNServerJob, using: transaction)
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}, completion: { })
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}
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}
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// Return
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return promise
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}
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// MARK: Open Groups
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internal static func sendToOpenGroupDestination(_ destination: Message.Destination, message: Message, using transaction: Any) -> Promise<Void> {
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let (promise, seal) = Promise<Void>.pending()
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let storage = SNMessagingKitConfiguration.shared.storage
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if message.sentTimestamp == nil { // Visible messages will already have their sent timestamp set
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message.sentTimestamp = NSDate.millisecondTimestamp()
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}
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message.sender = storage.getUserPublicKey()
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switch destination {
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case .contact(_): preconditionFailure()
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case .closedGroup(_): preconditionFailure()
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case .openGroup(let channel, let server): message.recipient = "\(server).\(channel)"
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}
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// Set the failure handler (for precondition failure handling)
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let _ = promise.catch(on: DispatchQueue.global(qos: .userInitiated)) { error in
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storage.withAsync({ transaction in
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MessageSender.handleFailedMessageSend(message, with: error, using: transaction)
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}, completion: { })
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}
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// Validate the message
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guard let message = message as? VisibleMessage else {
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#if DEBUG
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preconditionFailure()
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#else
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seal.reject(Error.invalidMessage)
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return promise
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#endif
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}
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guard message.isValid else { seal.reject(Error.invalidMessage); return promise }
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// Convert the message to an open group message
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let (channel, server) = { () -> (UInt64, String) in
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switch destination {
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case .openGroup(let channel, let server): return (channel, server)
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default: preconditionFailure()
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}
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}()
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guard let openGroupMessage = OpenGroupMessage.from(message, for: server, using: transaction as! YapDatabaseReadWriteTransaction) else { seal.reject(Error.invalidMessage); return promise }
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// Send the result
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OpenGroupAPI.sendMessage(openGroupMessage, to: channel, on: server).done(on: DispatchQueue.global(qos: .userInitiated)) { openGroupMessage in
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message.openGroupServerMessageID = openGroupMessage.serverID
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seal.fulfill(())
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}.catch(on: DispatchQueue.global(qos: .userInitiated)) { error in
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seal.reject(error)
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}
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// Handle completion
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let _ = promise.done(on: DispatchQueue.global(qos: .userInitiated)) {
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storage.withAsync({ transaction in
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MessageSender.handleSuccessfulMessageSend(message, to: destination, using: transaction)
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}, completion: { })
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}
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// Return
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return promise
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}
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// MARK: Success & Failure Handling
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public static func handleSuccessfulMessageSend(_ message: Message, to destination: Message.Destination, using transaction: Any) {
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guard let tsMessage = TSOutgoingMessage.find(withTimestamp: message.sentTimestamp!) else { return }
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tsMessage.openGroupServerMessageID = message.openGroupServerMessageID ?? 0
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tsMessage.isOpenGroupMessage = tsMessage.openGroupServerMessageID != 0
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var recipients = [ message.recipient! ]
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if case .closedGroup(_) = destination, let threadID = message.threadID, // threadID should always be set at this point
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let thread = TSGroupThread.fetch(uniqueId: threadID, transaction: transaction as! YapDatabaseReadTransaction), thread.usesSharedSenderKeys {
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recipients = thread.groupModel.groupMemberIds
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}
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recipients.forEach { recipient in
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tsMessage.update(withSentRecipient: recipient, wasSentByUD: true, transaction: transaction as! YapDatabaseReadWriteTransaction)
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}
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OWSDisappearingMessagesJob.shared().startAnyExpiration(for: tsMessage, expirationStartedAt: NSDate.millisecondTimestamp(), transaction: transaction as! YapDatabaseReadWriteTransaction)
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}
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public static func handleFailedMessageSend(_ message: Message, with error: Swift.Error, using transaction: Any) {
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guard let tsMessage = TSOutgoingMessage.find(withTimestamp: message.sentTimestamp!) else { return }
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tsMessage.update(sendingError: error, transaction: transaction as! YapDatabaseReadWriteTransaction)
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}
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}
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