Add Relay Detail View

Changelog-Added: Relay Detail View
Closes: #479

damus/Nostr/Relay.swift

@@ -24,6 +24,16 @@ enum RelayFlags: Int {
     case broken = 1
 }
 
+struct RelayNIP11: Codable {
+    var name = "No data available"
+    var description = "No data available"
+    var pubkey = "No data available"
+    var contact = "No data available"
+    var supported_nips: [Int] = []
+    var software = "No data available"
+    var version = "No data available"
+}
+
 class Relay: Identifiable {
     let descriptor: RelayDescriptor
     let connection: RelayConnection

damus/Util/NIPURLBuilder.swift

@@ -0,0 +1,26 @@
+//
+//  NIPURLBuilder.swift
+//  damus
+//
+//  Created by Honk on 2/1/23.
+//
+
+import Foundation
+
+struct NIPURLBuilder {
+    static private let baseURL = "https://github.com/nostr-protocol/nips/blob/master/"
+    static func url(forNIP nip: Int) -> URL? {
+        let urlString = baseURL + "\(formatNipNumber(nip: nip)).md"
+        return URL(string: urlString)
+    }
+    
+    static func formatNipNumber(nip: Int) -> String {
+        let formatted: String
+        if nip < 10 {
+            formatted = "0\(nip)"
+        } else {
+            formatted = "\(nip)"
+        }
+        return formatted
+    }
+}

damus/Views/Relays/RelayDetailView.swift

@@ -0,0 +1,116 @@
+//
+//  RelayDetailView.swift
+//  damus
+//
+//  Created by Joel Klabo on 2/1/23.
+//
+
+import SwiftUI
+
+struct RelayDetailView: View {
+    let state: DamusState
+    let relay: String
+    
+    @State private var errorString: String?
+    @State private var nip11: RelayNIP11?
+    
+    @State var conn_color: Color
+        
+    var body: some View {
+        Group {
+            if let nip11 {
+                Form {
+                    Section(NSLocalizedString("Admin", comment: "Label to display relay contact user.")) {
+                        UserView(damus_state: state, pubkey: nip11.pubkey)
+                    }
+                    Section(NSLocalizedString("Relay", comment: "Label to display relay address.")) {
+                        HStack {
+                            Text(relay)
+                            Spacer()
+                            Circle()
+                                .frame(width: 8.0, height: 8.0)
+                                .foregroundColor(conn_color)
+                        }
+                    }
+                    Section(NSLocalizedString("Description", comment: "Label to display relay description.")) {
+                        Text(nip11.description)
+                    }
+                    Section(NSLocalizedString("Contact", comment: "Label to display relay contact information.")) {
+                        Text(nip11.contact)
+                    }
+                    Section(NSLocalizedString("Software", comment: "Label to display relay software.")) {
+                        Text(nip11.software)
+                    }
+                    Section(NSLocalizedString("Version", comment: "Label to display relay software version.")) {
+                        Text(nip11.version)
+                    }
+                    Section(NSLocalizedString("Supported NIPs", comment: "Label to display relay's supported NIPs.")) {
+                        Text(nipsList(nips: nip11.supported_nips))
+                    }
+                }
+            } else if let errorString {
+                Text(errorString)
+                    .foregroundColor(.red)
+                    .font(.caption)
+            } else {
+                ProgressView()
+            }
+        }
+        .navigationTitle(nip11?.name ?? "")
+        .task {
+            var urlString = relay.replacingOccurrences(of: "wss://", with: "https://")
+            urlString = urlString.replacingOccurrences(of: "ws://", with: "http://")
+            
+            guard let url = URL(string: urlString) else {
+                return
+            }
+            
+            var request = URLRequest(url: url)
+            request.setValue("application/nostr+json", forHTTPHeaderField: "Accept")
+            
+            var res: (Data, URLResponse)? = nil
+            
+            do {
+                res = try await URLSession.shared.data(for: request)
+            } catch {
+                errorString = error.localizedDescription
+                return
+            }
+            
+            guard let data = res?.0 else {
+                errorString = "Relay not responding to metadata request"
+                return
+            }
+            
+            do {
+                let nip11 = try JSONDecoder().decode(RelayNIP11.self, from: data)
+                self.nip11 = nip11
+            } catch {
+                errorString = error.localizedDescription
+            }
+        }
+    }
+    
+    private func nipsList(nips: [Int]) -> AttributedString {
+        var attrString = AttributedString()
+        let lastNipIndex = nips.count - 1
+        for (index, nip) in nips.enumerated() {
+            if let link = NIPURLBuilder.url(forNIP: nip) {
+                let nipString = NIPURLBuilder.formatNipNumber(nip: nip)
+                var nipAttrString = AttributedString(stringLiteral: nipString)
+                nipAttrString.link = link
+                attrString = attrString + nipAttrString
+                if index < lastNipIndex {
+                    attrString = attrString + AttributedString(stringLiteral: ", ")
+                }
+            }
+        }
+        return attrString
+    }
+}
+
+struct RelayDetailView_Previews: PreviewProvider {
+    static var previews: some View {
+        RelayDetailView(state: test_damus_state(), relay: "wss://nostr.klabo.blog", conn_color: .green)
+    }
+}

damus/Views/Relays/RelayView.swift

@@ -34,7 +34,11 @@ struct RelayView: View {
             Circle()
                 .frame(width: 8.0, height: 8.0)
                 .foregroundColor(conn_color)
-            Text(relay)
+            NavigationLink {
+                RelayDetailView(state: state, relay: relay, conn_color: conn_color)
+            } label: {
+                Text(relay)
+            }
         }
         .onReceive(timer) { _ in
             update_connection_color()