9XJ9UyNk

1using System;
2using System.Linq;
3using System.Security.Cryptography;
4using System.Text;
5
6class Program
7{
8    static void Main(string[] args)
9    {
10        //Выведите платёжные ссылки для трёх разных систем платежа: 
11        //pay.system1.ru/order?amount=12000RUB&hash={MD5 хеш ID заказа}
12        //order.system2.ru/pay?hash={MD5 хеш ID заказа + сумма заказа}
13        //system3.com/pay?amount=12000&curency=RUB&hash={SHA-1 хеш сумма заказа + ID заказа + секретный ключ от системы}
14
15        PayLinkFinder payLinkFinder1 = new PayLinkFinder(new System1(new MD5HashInt()), new Order(13, 12000));
16        PayLinkFinder payLinkFinder2 = new PayLinkFinder(new System2(new MD5HashInt()), new Order(4234, 3000));
17        PayLinkFinder payLinkFinder3 = new PayLinkFinder(new System3(new SHA1HashInt()), new Order(5321, 12000));
18
19        PayLinkFinder[] payLinkFinders = new PayLinkFinder[] { payLinkFinder1, payLinkFinder2, payLinkFinder3 };
20
21        foreach (var payLinkFinder in payLinkFinders)
22        {
23            payLinkFinder.Find();
24        }
25    }
26}
27
28public class PayLinkFinder
29{
30    private IPaymentSystem _paymentSystem;
31    private Order _order;
32
33    public PayLinkFinder(IPaymentSystem paymentSystem, Order order)
34    {
35        _paymentSystem = paymentSystem;
36        _order = order;
37    }
38
39    public void Find()
40    {
41        Console.WriteLine(_paymentSystem.GetPayingLink(_order));
42        Console.WriteLine();
43    }
44}
45
46public class MD5HashInt : IHash
47{
48    public string GetHash(int inputData)
49    {
50        MD5 md5 = MD5.Create();
51
52        return String.Concat(md5.ComputeHash(BitConverter.GetBytes(inputData)).Select(x => x.ToString("x2")));
53    }
54}
55
56public class SHA1HashInt : IHash
57{
58    public string GetHash(int inputData)
59    {
60        var hash = new SHA1Managed().ComputeHash(Encoding.UTF8.GetBytes(inputData.ToString()));
61
62        return $"{String.Concat(hash.Select(b => b.ToString("x2")))}";
63    }
64}
65
66public class Order
67{
68    public readonly int Id;
69    public readonly int Amount;
70
71    public Order(int id, int amount)
72    {
73        Id = id;
74        Amount = amount;
75    }
76}
77
78public abstract class PaymentSystem : IPaymentSystem
79{
80    protected readonly IHash HashInt;
81    protected readonly string PaymentSystemLink;
82
83    protected PaymentSystem(IHash hashInt)
84    {
85        HashInt = hashInt;
86    }
87
88    public abstract string GetPayingLink(Order order);
89}
90
91public class System1 : PaymentSystem
92{
93    public System1(IHash hashInt) : base(hashInt)
94    {
95    }
96
97    public override string GetPayingLink(Order order)
98    {
99        return $"pay.system1.ru/order?amount=12000RUB&hash={HashInt.GetHash(order.Id)}";
100    }
101}
102
103public class System2 : PaymentSystem
104{
105    public System2(IHash hashInt) : base(hashInt)
106    {
107    }
108
109    public override string GetPayingLink(Order order)
110    {
111        return $"order.system2.ru/pay?hash ={HashInt.GetHash(order.Id)}+{HashInt.GetHash(order.Amount)}";
112    }
113}
114
115public class System3 : PaymentSystem
116{
117    private int _secretKey = 125623145;
118
119    public System3(IHash hashInt) : base(hashInt)
120    {
121    }
122
123    public override string GetPayingLink(Order order)
124    {
125        return $"system3.com/pay?amount=12000&curency=RUB&hash={HashInt.GetHash(order.Id)}+{HashInt.GetHash(order.Amount)}+{HashInt.GetHash(_secretKey)}";
126    }
127}
128
129public interface IPaymentSystem
130{
131    public string GetPayingLink(Order order);
132}
133
134public interface IHash
135{
136    public string GetHash(int inputData);
137}