mirror of
https://github.com/imgproxy/imgproxy.git
synced 2024-12-09 09:56:01 +02:00
61 lines
2.2 KiB
C#
61 lines
2.2 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Security.Cryptography;
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using System.Text;
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namespace ImgProxy.Examples
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{
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class Program
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{
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static void Main(string[] args)
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{
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const string Key = "943b421c9eb07c830af81030552c86009268de4e532ba2ee2eab8247c6da0881";
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const string Salt = "520f986b998545b4785e0defbc4f3c1203f22de2374a3d53cb7a7fe9fea309c5";
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const string Url = "http://img.example.com/pretty/image.jpg";
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const string Resize = "fill";
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const int Width = 300;
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const int Height = 300;
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const string Gravity = "no";
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const int Enlarge = 1;
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const string Extension = "png";
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var url = GenerateUrl(Key, Salt, Url, Resize, Width, Height, Gravity, Enlarge, Extension);
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Console.WriteLine(url);
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}
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static string GenerateUrl(string key, string salt, string url, string resize, int width, int height, string gravity, int enlarge, string extension)
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{
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var keybin = StringToByteArray(key);
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var saltBin = StringToByteArray(salt);
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var encodedUrl = string.Join("/", WholeChunks(Convert.ToBase64String(Encoding.UTF8.GetBytes(url)).TrimEnd('='), 16));
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var path = $"/{resize}/{width}/{height}/{gravity}/{enlarge}/{encodedUrl}.{extension}";
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using (var hmac = new HMACSHA256(keybin))
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{
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var hash = hmac.ComputeHash(saltBin.Concat(Encoding.UTF8.GetBytes(path)).ToArray());
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return $"/{Convert.ToBase64String(hash).TrimEnd('=')}{path}";
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}
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}
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static byte[] StringToByteArray(string hex)
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{
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return Enumerable.Range(0, hex.Length)
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.Where(x => x % 2 == 0)
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.Select(x => Convert.ToByte(hex.Substring(x, 2), 16))
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.ToArray();
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}
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static IEnumerable<string> WholeChunks(string str, int maxChunkSize)
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{
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for (int i = 0; i < str.Length; i += maxChunkSize)
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yield return str.Substring(i, Math.Min(maxChunkSize, str.Length - i));
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}
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}
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}
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