switch to bech32 everywhere

You can now use @npub, @note or @nsec to reference notes and pubkeys

Changelog-Changed: use bech32 ids everywhere
Signed-off-by: William Casarin <jb55@jb55.com>

damus/Models/Post.swift

@@ -32,15 +32,76 @@ func parse_post_reference(_ p: Parser) -> ReferencedId? {
         return parse_nostr_ref_uri(p)
     }
     
-    guard let id = parse_hexstr(p, len: 64) else {
+    if let ref = parse_post_mention(p, mention_type: typ) {
+        return ref
+    }
+    
+    p.pos = start
+    
+    return nil
+}
+
+func is_bech32_char(_ c: Character) -> Bool {
+    let contains = "qpzry9x8gf2tvdw0s3jn54khce6mua7l".contains(c)
+    return contains
+}
+
+func parse_post_mention(_ p: Parser, mention_type: MentionType) -> ReferencedId? {
+    if let id = parse_hexstr(p, len: 64) {
+        return ReferencedId(ref_id: id, relay_id: nil, key: mention_type.ref)
+    } else if let bech32_ref = parse_post_bech32_mention(p) {
+        return bech32_ref
+    } else {
+        return nil
+    }
+}
+
+func parse_post_bech32_mention(_ p: Parser) -> ReferencedId? {
+    let start = p.pos
+    if parse_str(p, "note") {
+    } else if parse_str(p, "npub") {
+    } else if parse_str(p, "nsec") {
+    } else {
+        return nil
+    }
+    
+    if !parse_char(p, "1") {
         p.pos = start
         return nil
     }
     
-    return ReferencedId(ref_id: id, relay_id: nil, key: typ.ref)
+    var end = p.pos
+    if consume_until(p, match: { c in !is_bech32_char(c) }) {
+        end = p.pos
+    } else {
+        p.pos = start
+        return nil
+    }
+    
+    let sliced = String(substring(p.str, start: start, end: end))
+    guard let decoded = try? bech32_decode(sliced) else {
+        p.pos = start
+        return nil
+    }
+    
+    let hex = hex_encode(decoded.data)
+    switch decoded.hrp {
+    case "note":
+        return ReferencedId(ref_id: hex, relay_id: nil, key: "e")
+    case "npub":
+        return ReferencedId(ref_id: hex, relay_id: nil, key: "p")
+    case "nsec":
+        guard let pubkey = privkey_to_pubkey(privkey: hex) else {
+            p.pos = start
+            return nil
+        }
+        return ReferencedId(ref_id: pubkey, relay_id: nil, key: "p")
+    default:
+        p.pos = start
+        return nil
+    }
 }
 
-
 /// Return a list of tags
 func parse_post_blocks(content: String) -> [PostBlock] {
     let p = Parser(pos: 0, str: content)

damus/Util/Keys.swift

@@ -58,6 +58,13 @@ func bech32_pubkey(_ pubkey: String) -> String? {
     return bech32_encode(hrp: "npub", bytes)
 }
 
+func bech32_note_id(_ evid: String) -> String? {
+    guard let bytes = hex_decode(evid) else {
+        return nil
+    }
+    return bech32_encode(hrp: "note", bytes)
+}
+
 func generate_new_keypair() -> Keypair {
     let key = try! secp256k1.Signing.PrivateKey()
     let privkey = hex_encode(key.rawRepresentation)

damus/Views/EventView.swift

@@ -148,6 +148,16 @@ struct EventView: View {
 }
 
 extension View {
+    func pubkey_context_menu(bech32_pubkey: String) -> some View {
+        return self.contextMenu {
+            Button {
+                    UIPasteboard.general.string = bech32_pubkey
+            } label: {
+                Label("Copy Account ID", systemImage: "doc.on.doc")
+            }
+        }
+    }
+    
     func event_context_menu(_ event: NostrEvent, privkey: String?) -> some View {
         return self.contextMenu {
             Button {
@@ -157,13 +167,13 @@ extension View {
             }
 
             Button {
-                UIPasteboard.general.string = "@" + event.pubkey
+                UIPasteboard.general.string = bech32_pubkey(event.pubkey) ?? event.pubkey
             } label: {
                 Label("Copy User ID", systemImage: "tag")
             }
 
             Button {
-                UIPasteboard.general.string = "&" + event.id
+                UIPasteboard.general.string = bech32_note_id(event.id) ?? event.id
             } label: {
                 Label("Copy Note ID", systemImage: "tag")
             }

damus/Views/ProfileView.swift

@@ -104,6 +104,7 @@ struct ProfileView: View {
             
             KeyView(pubkey: profile.pubkey)
                 .padding(.bottom, 10)
+                .pubkey_context_menu(bech32_pubkey: bech32_pubkey(profile.pubkey) ?? profile.pubkey)
             
             Text(data?.about ?? "")
         
@@ -190,12 +191,14 @@ struct KeyView: View {
     
     var body: some View {
         let col = id_to_color(pubkey)
+        let bech32 = bech32_pubkey(pubkey) ?? pubkey
+        let half = bech32.count / 2
         
         VStack {
-            Text("\(String(pubkey.prefix(32)))")
+            Text("\(String(bech32.prefix(half)))")
                 .foregroundColor(colorScheme == .light ? .black : col)
                 .font(.footnote.monospaced())
-            Text("\(String(pubkey.suffix(32)))")
+            Text("\(String(bech32.suffix(half)))")
                 .font(.footnote.monospaced())
                 .foregroundColor(colorScheme == .light ? .black : col)
         }