Nextcloud login flow v2, Network code rewrite

Nextcloud Cookbook iOS Client/Extensions/DateFormatterExtension.swift

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+//
+//  DateFormatterExtension.swift
+//  Nextcloud Cookbook iOS Client
+//
+//  Created by Vincent Meilinger on 14.09.23.
+//
+
+import Foundation
+
+extension Formatter {
+    static let positional: DateComponentsFormatter = {
+        let formatter = DateComponentsFormatter()
+        formatter.unitsStyle = .positional
+        return formatter
+    }()
+}
+
+func formatDate(duration: String) -> String {
+    var duration = duration
+    if duration.hasPrefix("PT") { duration.removeFirst(2) }
+    let hour, minute, second: Double
+    if let index = duration.firstIndex(of: "H") {
+        hour = Double(duration[..<index]) ?? 0
+        duration.removeSubrange(...index)
+    } else { hour = 0 }
+    if let index = duration.firstIndex(of: "M") {
+        minute = Double(duration[..<index]) ?? 0
+        duration.removeSubrange(...index)
+    } else { minute = 0 }
+    if let index = duration.firstIndex(of: "S") {
+        second = Double(duration[..<index]) ?? 0
+    } else { second = 0 }
+    return Formatter.positional.string(from: hour * 3600 + minute * 60 + second) ?? "0:00"
+}

Nextcloud Cookbook iOS Client/Extensions/JSONCoderExtension.swift

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+//
+//  JSONCoderExtension.swift
+//  Nextcloud Cookbook iOS Client
+//
+//  Created by Vincent Meilinger on 20.09.23.
+//
+
+import Foundation
+
+extension JSONDecoder {
+    static func safeDecode<T: Decodable>(_ data: Data) -> T? {
+        let decoder = JSONDecoder()
+        do {
+            print("Decoding type ", T.self, " ...")
+            return try decoder.decode(T.self, from: data)
+        } catch (let error) {
+            print("JSONDecoder - safeDecode(): Failed to decode data.")
+            print("Error: ", error)
+            return nil
+        }
+    }
+}
+
+extension JSONEncoder {
+    static func safeEncode<T: Encodable>(_ object: T) -> Data? {
+        do {
+            return try JSONEncoder().encode(object)
+        } catch {
+            print("JSONDecoder - safeEncode(): Could not encode object \(T.self)")
+        }
+        return nil
+    }
+}