143 lines
4.0 KiB
Swift
143 lines
4.0 KiB
Swift
import Combine
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import Foundation
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import MultipeerConnectivity
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struct OwnPeer {
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let peer: MCPeerID
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}
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struct Peer: Identifiable {
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enum ConnectionState {
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case available
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case joined
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case rejected
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case invitationPending
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}
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var id: String { mcPeer.displayName }
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let mcPeer: MCPeerID
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var state: ConnectionState
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}
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@Observable
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final class NoteEditingSessionServer: NSObject {
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private let session: MCSession
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private let browser: MCNearbyServiceBrowser
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private(set) var ownPeer: OwnPeer
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var visiblePeers: [Peer] = []
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let noteChangesEmitter = PassthroughSubject<NoteMessage, Never>()
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init(peer: OwnPeer) {
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ownPeer = peer
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browser = .init(peer: peer.peer, serviceType: "peered")
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session = .init(peer: peer.peer, securityIdentity: nil, encryptionPreference: .required)
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super.init()
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browser.delegate = self
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session.delegate = self
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}
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func startServer() {
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browser.startBrowsingForPeers()
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}
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func stopServer() {
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browser.stopBrowsingForPeers()
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session.disconnect()
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}
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func invite(peer: Peer, to note: NoteInvitation.NoteContent) {
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guard peer.state == .available, let note = try? JSONEncoder().encode(note) else { return }
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browser.invitePeer(
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peer.mcPeer,
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to: session,
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withContext: note,
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timeout: 600
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)
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guard let idxToUpdate = visiblePeers.firstIndex(where: { $0.mcPeer == peer.mcPeer }) else {
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return
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}
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visiblePeers[idxToUpdate].state = .invitationPending
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}
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func send(note: String, to peers: [MCPeerID]) {
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let message = NoteMessage(senderID: ownPeer.peer.displayName, content: note)
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guard !peers.isEmpty, let data = try? JSONEncoder().encode(message) else { return }
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try? session.send(data, toPeers: peers, with: .reliable)
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}
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}
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extension NoteEditingSessionServer: MCNearbyServiceBrowserDelegate {
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func browser(
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_ browser: MCNearbyServiceBrowser,
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foundPeer peerID: MCPeerID,
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withDiscoveryInfo info: [String: String]?
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) {
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guard
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!visiblePeers.contains(where: { $0.mcPeer == peerID })
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&& peerID.displayName != ownPeer.peer.displayName
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else { return }
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DispatchQueue.main.async {
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self.visiblePeers.append(Peer(mcPeer: peerID, state: .available))
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}
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}
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func browser(_ browser: MCNearbyServiceBrowser, lostPeer peerID: MCPeerID) {
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DispatchQueue.main.async {
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guard let peerIdx = self.visiblePeers.firstIndex(where: { $0.mcPeer == peerID }) else {
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return
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}
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self.visiblePeers.remove(at: peerIdx)
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}
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}
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}
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extension NoteEditingSessionServer: MCSessionDelegate {
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func session(
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_ session: MCSession,
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peer peerID: MCPeerID,
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didChange state: MCSessionState
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) {
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DispatchQueue.main.async {
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guard let idx = self.visiblePeers.firstIndex(where: { $0.mcPeer == peerID }) else { return }
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switch state {
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case .connected:
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self.visiblePeers[idx].state = .joined
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case .notConnected:
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let currentState = self.visiblePeers[idx].state
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if currentState == .invitationPending || currentState == .joined {
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self.visiblePeers[idx].state = .rejected
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}
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default:
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break
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}
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}
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}
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func session(_ session: MCSession, didReceive data: Data, fromPeer peerID: MCPeerID) {
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guard let message = try? JSONDecoder().decode(NoteMessage.self, from: data) else { return }
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let otherPeers = session.connectedPeers.filter { $0 != peerID }
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if !otherPeers.isEmpty {
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try? session.send(data, toPeers: otherPeers, with: .reliable)
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}
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DispatchQueue.main.async {
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self.noteChangesEmitter.send(message)
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}
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}
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func session(
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_ session: MCSession, didReceive stream: InputStream, withName streamName: String,
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fromPeer peerID: MCPeerID
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) {}
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func session(
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_ session: MCSession, didStartReceivingResourceWithName resourceName: String,
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fromPeer peerID: MCPeerID, with progress: Progress
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) {}
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func session(
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_ session: MCSession, didFinishReceivingResourceWithName resourceName: String,
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fromPeer peerID: MCPeerID, at localURL: URL?, withError error: (any Error)?
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) {}
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}
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