feat: initial ui implementation

dns/BlockedCount.swift

@@ -0,0 +1,71 @@
+
+import SwiftUI
+import Foundation
+
+struct BlockedCount: View {
+    @State private var txtRecord: String = "..."
+
+    var body: some View {
+        Text(txtRecord)
+        .onAppear {
+            fetchTXTRecord()
+        }
+    }
+
+    func parseResponse(data: Data) -> String? {
+        // This is a DNS wire format response and we make a lot of assumptions
+        // It is not critical functionality so just let it fail if it fails
+
+        guard data.count > 44 else { return nil }
+
+        let startIndex = 44
+        let subData = data.suffix(from: startIndex)
+
+        // Find the first space character (ASCII 32)
+        var endIndex: Int?
+        for (offset, byte) in subData.enumerated() {
+            if byte == 32 { // Space character
+                endIndex = offset
+                break
+            }
+        }
+
+        guard let foundEndIndex = endIndex else { return nil }
+
+        // Extract bytes between start and space
+        let numberData = subData.prefix(foundEndIndex)
+
+        return String(decoding: numberData, as: UTF8.self)
+    }
+    
+    func fetchTXTRecord() {
+        let dohURL = URL(string: "https://dns.sr2.uk/dns-query?dns=DoQBAAABAAAAAAAABXN0YXRzB2ludmFsaWQAABAAAQ")!
+
+        let request = URLRequest(url: dohURL)
+
+        URLSession.shared.dataTask(with: request) { data, response, error in
+            DispatchQueue.main.async {
+                if error != nil {
+                    txtRecord = "Error"
+                    return
+                }
+
+                guard let data = data else {
+                    txtRecord = "Error"
+                    return
+                }
+
+                guard let count = parseResponse(data: data) else {
+                    txtRecord = "Error"
+                    return
+                }
+
+                txtRecord = count
+            }
+        }.resume()
+    }
+}
+
+#Preview {
+    BlockedCount()
+}