following and unfollowing

Signed-off-by: William Casarin <jb55@jb55.com>

damus.xcodeproj/project.pbxproj

@@ -31,6 +31,7 @@
 		4C363AA228296A7E006E126D /* SearchView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 4C363AA128296A7E006E126D /* SearchView.swift */; };
 		4C363AA428296DEE006E126D /* SearchModel.swift in Sources */ = {isa = PBXBuildFile; fileRef = 4C363AA328296DEE006E126D /* SearchModel.swift */; };
 		4C363AA828297703006E126D /* InsertSort.swift in Sources */ = {isa = PBXBuildFile; fileRef = 4C363AA728297703006E126D /* InsertSort.swift */; };
+		4C3AC79B28306D7B00E1F516 /* Contacts.swift in Sources */ = {isa = PBXBuildFile; fileRef = 4C3AC79A28306D7B00E1F516 /* Contacts.swift */; };
 		4C3BEFD22819DB9B00B3DE84 /* ProfileModel.swift in Sources */ = {isa = PBXBuildFile; fileRef = 4C3BEFD12819DB9B00B3DE84 /* ProfileModel.swift */; };
 		4C3BEFD42819DE8F00B3DE84 /* NostrKind.swift in Sources */ = {isa = PBXBuildFile; fileRef = 4C3BEFD32819DE8F00B3DE84 /* NostrKind.swift */; };
 		4C3BEFD6281D995700B3DE84 /* ActionBarModel.swift in Sources */ = {isa = PBXBuildFile; fileRef = 4C3BEFD5281D995700B3DE84 /* ActionBarModel.swift */; };
@@ -115,6 +116,7 @@
 		4C363AA128296A7E006E126D /* SearchView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SearchView.swift; sourceTree = "<group>"; };
 		4C363AA328296DEE006E126D /* SearchModel.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SearchModel.swift; sourceTree = "<group>"; };
 		4C363AA728297703006E126D /* InsertSort.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = InsertSort.swift; sourceTree = "<group>"; };
+		4C3AC79A28306D7B00E1F516 /* Contacts.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Contacts.swift; sourceTree = "<group>"; };
 		4C3BEFD12819DB9B00B3DE84 /* ProfileModel.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ProfileModel.swift; sourceTree = "<group>"; };
 		4C3BEFD32819DE8F00B3DE84 /* NostrKind.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = NostrKind.swift; sourceTree = "<group>"; };
 		4C3BEFD5281D995700B3DE84 /* ActionBarModel.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ActionBarModel.swift; sourceTree = "<group>"; };
@@ -204,6 +206,7 @@
 				4C363A9928283854006E126D /* Reply.swift */,
 				4C363A9B282838B9006E126D /* EventRef.swift */,
 				4C363AA328296DEE006E126D /* SearchModel.swift */,
+				4C3AC79A28306D7B00E1F516 /* Contacts.swift */,
 			);
 			path = Models;
 			sourceTree = "<group>";
@@ -526,6 +529,7 @@
 				4C363A922825FCF2006E126D /* ProfileUpdate.swift in Sources */,
 				4C0A3F95280F6C78000448DE /* ReplyQuoteView.swift in Sources */,
 				4C3BEFDA281DCA1400B3DE84 /* LikeCounter.swift in Sources */,
+				4C3AC79B28306D7B00E1F516 /* Contacts.swift in Sources */,
 				4C363A8E28236FE4006E126D /* NoteContentView.swift in Sources */,
 				4CACA9D5280C31E100D9BBE8 /* ReplyView.swift in Sources */,
 				4C0A3F97280F8E02000448DE /* ThreadView.swift in Sources */,

damus/ContentView.swift

@@ -43,7 +43,6 @@ enum Timeline: String, CustomStringConvertible {
 struct ContentView: View {
     @State var status: String = "Not connected"
     @State var active_sheet: Sheets? = nil
-    @State var friends: [String: ()] = [:]
     @State var loading: Bool = true
     @State var damus: DamusState? = nil
     @State var selected_timeline: Timeline? = .home
@@ -209,7 +208,8 @@ struct ContentView: View {
         Group {
             if let pk = self.active_profile {
                 let profile_model = ProfileModel(pubkey: pk, damus: damus!)
-                ProfileView(damus: damus!, profile: profile_model)
+                let fs = damus!.contacts.follow_state(pk)
+                ProfileView(damus: damus!, follow_state: fs, profile: profile_model)
             } else {
                 EmptyView()
             }
@@ -290,6 +290,37 @@ struct ContentView: View {
             let ev = obj.object as! NostrEvent
             self.damus?.pool.send(.event(ev))
         }
+        .onReceive(handle_notify(.unfollow)) { notif in
+            let pk = notif.object as! String
+            guard let damus = self.damus else {
+                return
+            }
+            
+            if unfollow_user(pool: damus.pool,
+                             our_contacts: damus.contacts.event,
+                             pubkey: damus.pubkey,
+                             privkey: privkey,
+                             unfollow: pk) {
+                notify(.unfollowed, pk)
+                damus.contacts.friends.remove(pk)
+                //friend_events = friend_events.filter { $0.pubkey != pk }
+            }
+        }
+        .onReceive(handle_notify(.follow)) { notif in
+            let pk = notif.object as! String
+            guard let damus = self.damus else {
+                return
+            }
+            
+            if follow_user(pool: damus.pool,
+                           our_contacts: damus.contacts.event,
+                           pubkey: damus.pubkey,
+                           privkey: privkey,
+                           follow: ReferencedId(ref_id: pk, relay_id: nil, key: "p")) {
+                notify(.followed, pk)
+                damus.contacts.friends.insert(pk)
+            }
+        }
         .onReceive(handle_notify(.post)) { obj in
             let post_res = obj.object as! NostrPostResult
             switch post_res {
@@ -308,12 +339,13 @@ struct ContentView: View {
         }
     }
     
-    func is_friend(pubkey: String) -> Bool {
-        return pubkey == self.pubkey || friends[pubkey] != nil
+    func is_friend_event(_ ev: NostrEvent) -> Bool {
+        // we should be able to see our own messages in our homefeed
+        if ev.pubkey == self.pubkey {
+            return true
         }
         
-    func is_friend_event(_ ev: NostrEvent) -> Bool {
-        if is_friend(pubkey: ev.pubkey) {
+        if damus!.contacts.is_friend(ev.pubkey) {
             return true
         }
         
@@ -323,7 +355,7 @@ struct ContentView: View {
                 return true
             }
             for pk in ev.referenced_pubkeys {
-                if is_friend(pubkey: pk.ref_id) {
+                if damus!.contacts.is_friend(pk.ref_id) {
                     return true
                 }
             }
@@ -366,13 +398,14 @@ struct ContentView: View {
         add_relay(pool, "wss://nostr.bitcoiner.social")
         add_relay(pool, "ws://monad.jb55.com:8080")
         add_relay(pool, "wss://nostr-relay.freeberty.net")
-        add_relay(pool, "wss://nostr-relay.untethr.me")
+        //add_relay(pool, "wss://nostr-relay.untethr.me")
 
         pool.register_handler(sub_id: sub_id, handler: handle_event)
 
         self.damus = DamusState(pool: pool, pubkey: pubkey,
                                 likes: EventCounter(our_pubkey: pubkey),
                                 boosts: EventCounter(our_pubkey: pubkey),
+                                contacts: Contacts(),
                                 tips: TipCounter(our_pubkey: pubkey),
                                 image_cache: ImageCache(),
                                 profiles: Profiles()
@@ -382,10 +415,11 @@ struct ContentView: View {
 
     func handle_contact_event(_ ev: NostrEvent) {
         if ev.pubkey == self.pubkey {
+            damus!.contacts.event = ev
             // our contacts
             for tag in ev.tags {
                 if tag.count > 1 && tag[0] == "p" {
-                    self.friends[tag[1]] = ()
+                    damus!.contacts.friends.insert(tag[1])
                 }
             }
         }
@@ -728,7 +762,6 @@ func get_like_pow() -> [String] {
 
 
 func update_filters_with_since(last_of_kind: [Int: NostrEvent], filters: [NostrFilter]) -> [NostrFilter] {
-    let now = Int64(Date.now.timeIntervalSince1970)
     
     return filters.map { filter in
         let kinds = filter.kinds ?? []

damus/Models/Contacts.swift

@@ -0,0 +1,122 @@
+//
+//  Contacts.swift
+//  damus
+//
+//  Created by William Casarin on 2022-05-14.
+//
+
+import Foundation
+
+
+class Contacts {
+    var friends: Set<String> = Set()
+    var event: NostrEvent?
+    
+    func is_friend(_ pubkey: String) -> Bool {
+        return friends.contains(pubkey)
+    }
+    
+    func follow_state(_ pubkey: String) -> FollowState {
+        return is_friend(pubkey) ? .follows : .unfollows
+    }
+}
+
+
+func create_contacts(relays: [RelayDescriptor], our_pubkey: String, follow: ReferencedId) -> NostrEvent {
+    let kind = NostrKind.contacts.rawValue
+    let content = create_contacts_content(relays) ?? "{}"
+    let tags = [refid_to_tag(follow)]
+    return NostrEvent(content: content, pubkey: our_pubkey, kind: kind, tags: tags)
+}
+
+func create_contacts_content(_ relays: [RelayDescriptor]) -> String? {
+    // TODO: just create a new one of this is corrupted?
+    let crelays = make_contact_relays(relays)
+    guard let encoded = encode_json(crelays) else {
+        return nil
+    }
+    return encoded
+}
+
+
+func follow_user(pool: RelayPool, our_contacts: NostrEvent?, pubkey: String, privkey: String, follow: ReferencedId) -> Bool {
+    guard let ev = follow_user_event(our_contacts: our_contacts, our_pubkey: pubkey, follow: follow) else {
+        return false
+    }
+    
+    ev.calculate_id()
+    ev.sign(privkey: privkey)
+    
+    pool.send(.event(ev))
+    
+    return true
+}
+
+func unfollow_user(pool: RelayPool, our_contacts: NostrEvent?, pubkey: String, privkey: String, unfollow: String) -> Bool {
+    guard let cs = our_contacts else {
+        return false
+    }
+    
+    let ev = unfollow_user_event(our_contacts: cs, our_pubkey: pubkey, unfollow: unfollow)
+    ev.calculate_id()
+    ev.sign(privkey: privkey)
+    
+    pool.send(.event(ev))
+    
+    return true
+}
+
+func unfollow_user_event(our_contacts: NostrEvent, our_pubkey: String, unfollow: String) -> NostrEvent {
+    let tags = our_contacts.tags.filter { tag in
+        if tag.count >= 2 && tag[0] == "p" && tag[1] == unfollow {
+            return false
+        }
+        return true
+    }
+    
+    let kind = NostrKind.contacts.rawValue
+    return NostrEvent(content: our_contacts.content, pubkey: our_pubkey, kind: kind, tags: tags)
+}
+
+func follow_user_event(our_contacts: NostrEvent?, our_pubkey: String, follow: ReferencedId) -> NostrEvent? {
+    guard let cs = our_contacts else {
+        // don't create contacts for now so we don't nuke our contact list due to connectivity issues
+        // we should only create contacts during profile creation
+        //return create_contacts(relays: relays, our_pubkey: our_pubkey, follow: follow)
+        return nil
+    }
+
+    guard let ev = follow_with_existing_contacts(our_pubkey: our_pubkey, our_contacts: cs, follow: follow) else {
+        return nil
+    }
+    
+    return ev
+}
+
+/*
+func ensure_relay_info(relays: [RelayDescriptor], content: String) -> [String: RelayInfo] {
+    guard let relay_info = decode_json_relays(content) else {
+        return make_contact_relays(relays)
+    }
+    return relay_info
+}
+ */
+
+func follow_with_existing_contacts(our_pubkey: String, our_contacts: NostrEvent, follow: ReferencedId) -> NostrEvent? {
+    // don't update if we're already following
+    if our_contacts.references(id: follow.ref_id, key: "p") {
+        return nil
+    }
+    
+    let kind = NostrKind.contacts.rawValue
+    var tags = our_contacts.tags
+    tags.append(refid_to_tag(follow))
+    return NostrEvent(content: our_contacts.content, pubkey: our_pubkey, kind: kind, tags: tags)
+}
+
+func make_contact_relays(_ relays: [RelayDescriptor]) -> [String: RelayInfo] {
+    return relays.reduce(into: [:]) { acc, relay in
+        acc[relay.url.absoluteString] = relay.info
+    }
+}
+

damus/Models/DamusState.swift

@@ -12,6 +12,7 @@ struct DamusState {
     let pubkey: String
     let likes: EventCounter
     let boosts: EventCounter
+    let contacts: Contacts
     let tips: TipCounter
     let image_cache: ImageCache
     let profiles: Profiles

damus/Models/ProfileModel.swift

@@ -12,12 +12,14 @@ class ProfileModel: ObservableObject {
     let pubkey: String
     let damus: DamusState
     
+    @Published var following: Bool
     var seen_event: Set<String> = Set()
     var sub_id = UUID().description
     
     init(pubkey: String, damus: DamusState) {
         self.pubkey = pubkey
         self.damus = damus
+        self.following = damus.contacts.is_friend(pubkey)
     }
     
     func unsubscribe() {

damus/Nostr/NostrEvent.swift

@@ -227,6 +227,11 @@ func decode_nostr_event(txt: String) -> NostrResponse? {
     return decode_data(Data(txt.utf8))
 }
 
+func encode_json<T: Encodable>(_ val: T) -> String? {
+    let encoder = JSONEncoder()
+    return (try? encoder.encode(val)).map { String(decoding: $0, as: UTF8.self) }
+}
+
 func decode_data<T: Decodable>(_ data: Data) -> T? {
     let decoder = JSONDecoder()
     do {

damus/Nostr/Relay.swift

@@ -7,7 +7,7 @@
 
 import Foundation
 
-struct RelayInfo {
+struct RelayInfo: Codable {
     let read: Bool
     let write: Bool
 

damus/Notifications.swift

@@ -109,6 +109,30 @@ extension Notification.Name {
     }
 }
 
+extension Notification.Name {
+    static var follow: Notification.Name {
+        return Notification.Name("follow")
+    }
+}
+
+extension Notification.Name {
+    static var unfollow: Notification.Name {
+        return Notification.Name("unfollow")
+    }
+}
+
+extension Notification.Name {
+    static var followed: Notification.Name {
+        return Notification.Name("followed")
+    }
+}
+
+extension Notification.Name {
+    static var unfollowed: Notification.Name {
+        return Notification.Name("unfollowed")
+    }
+}
+
 func handle_notify(_ name: Notification.Name) -> NotificationCenter.Publisher {
     return NotificationCenter.default.publisher(for: name)
 }

damus/Views/EventView.swift

@@ -68,7 +68,9 @@ struct EventView: View {
         return HStack {
             let profile = damus.profiles.lookup(id: event.pubkey)
             VStack {
-                let pv = ProfileView(damus: damus, profile: ProfileModel(pubkey: event.pubkey, damus: damus))
+                let pmodel = ProfileModel(pubkey: event.pubkey, damus: damus)
+                let fs = damus.contacts.follow_state(event.pubkey)
+                let pv = ProfileView(damus: damus, follow_state: fs, profile: pmodel)
                 
                 NavigationLink(destination: pv) {
                     ProfilePicView(pubkey: event.pubkey, size: PFP_SIZE!, highlight: highlight, image_cache: damus.image_cache, profiles: damus.profiles)
@@ -196,3 +198,5 @@ func make_actionbar_model(ev: NostrEvent, damus: DamusState) -> ActionBarModel {
                           our_tip: our_tip
     )
 }
+
+

damus/Views/ProfileView.swift

@@ -12,9 +12,58 @@ enum ProfileTab: Hashable {
     case following
 }
 
+enum FollowState {
+    case follows
+    case following
+    case unfollowing
+    case unfollows
+}
+
+func follow_btn_txt(_ fs: FollowState) -> String {
+    switch fs {
+    case .follows:
+        return "Unfollow"
+    case .following:
+        return "Following..."
+    case .unfollowing:
+        return "Unfollowing..."
+    case .unfollows:
+        return "Follow"
+    }
+}
+
+func follow_btn_enabled_state(_ fs: FollowState) -> Bool {
+    switch fs {
+    case .follows:
+        return true
+    case .following:
+        return false
+    case .unfollowing:
+        return false
+    case .unfollows:
+       return true
+    }
+}
+
+func perform_follow_btn_action(_ fs: FollowState, target: String) -> FollowState {
+    switch fs {
+    case .follows:
+        notify(.unfollow, target)
+        return .following
+    case .following:
+        return .following
+    case .unfollowing:
+        return .following
+    case .unfollows:
+        notify(.follow, target)
+        return .unfollowing
+    }
+}
+
 struct ProfileView: View {
     let damus: DamusState
     
+    @State var follow_state: FollowState = .follows
     @State private var selected_tab: ProfileTab = .posts
     @StateObject var profile: ProfileModel
     
@@ -28,8 +77,25 @@ struct ProfileView: View {
                 
                 Spacer()
                 
-                Button("Follow") {
-                    print("follow \(profile.pubkey)")
+                Button("\(follow_btn_txt(follow_state))") {
+                    follow_state = perform_follow_btn_action(follow_state, target: profile.pubkey)
+                }
+                .buttonStyle(.bordered)
+                .onReceive(handle_notify(.followed)) { notif in
+                    let pk = notif.object as! String
+                    if pk != profile.pubkey {
+                        return
+                    }
+                    
+                    self.follow_state = .follows
+                }
+                .onReceive(handle_notify(.unfollowed)) { notif in
+                    let pk = notif.object as! String
+                    if pk != profile.pubkey {
+                        return
+                    }
+                    
+                    self.follow_state = .unfollows
                 }
             }
             
@@ -62,6 +128,7 @@ struct ProfileView: View {
         
         .navigationBarTitle("Profile")
         .onAppear() {
+            follow_state = damus.contacts.follow_state(profile.pubkey)
             profile.subscribe()
         }
         .onDisappear {