damus

nostr ios client
git clone git://jb55.com/damus
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NIP05.swift (1543B)

      1 //
      2 //  NIP05.swift
      3 //  damus
      4 //
      5 //  Created by William Casarin on 2023-01-04.
      6 //
      7 
      8 import Foundation
      9 
     10 struct NIP05: Equatable {
     11     let username: String
     12     let host: String
     13     
     14     var url: URL? {
     15         URL(string: "https://\(host)/.well-known/nostr.json?name=\(username)")
     16     }
     17     
     18     var siteUrl: URL? {
     19         URL(string: "https://\(host)")
     20     }
     21     
     22     static func parse(_ nip05: String) -> NIP05? {
     23         let parts = nip05.split(separator: "@")
     24         guard parts.count == 2 else {
     25             return nil
     26         }
     27         return NIP05(username: String(parts[0]), host: String(parts[1]))
     28     }
     29 }
     30 
     31 
     32 struct NIP05Response: Decodable {
     33     let names: [String: Pubkey]
     34 }
     35 
     36 func fetch_nip05(nip05: NIP05) async -> NIP05Response? {
     37     guard let url = nip05.url else {
     38         return nil
     39     }
     40 
     41     print("fetching nip05 \(url.absoluteString)")
     42     guard let ret = try? await URLSession.shared.data(from: url) else {
     43         return nil
     44     }
     45     let dat = ret.0
     46     
     47     guard let decoded = try? JSONDecoder().decode(NIP05Response.self, from: dat) else {
     48         return nil
     49     }
     50     
     51     return decoded
     52 }
     53 
     54 func validate_nip05(pubkey: Pubkey, nip05_str: String) async -> NIP05? {
     55     guard let nip05 = NIP05.parse(nip05_str) else {
     56         return nil
     57     }
     58     
     59     guard let decoded = await fetch_nip05(nip05: nip05) else {
     60         return nil
     61     }
     62     
     63     guard let stored_pk = decoded.names[nip05.username] else {
     64         return nil
     65     }
     66     
     67     guard stored_pk == pubkey else {
     68         return nil
     69     }
     70     
     71     return nip05
     72 }