first commit

client/Writer/MainForm.cs

@@ -0,0 +1,72 @@
+using System;
+using System.IO;
+using System.Net.Http;
+using System.Security.Cryptography;
+using System.Text;
+using System.Text.Json;
+using System.Threading.Tasks;
+using System.Windows.Forms;
+
+namespace Writer
+{
+    public partial class MainForm : Form
+    {
+        private static readonly HttpClient http = new HttpClient();
+        private const string ServerUrl = "http://localhost:5000";
+
+        public MainForm()
+        {
+            InitializeComponent();
+        }
+
+        private void btnBrowse_Click(object sender, EventArgs e)
+        {
+            using var ofd = new OpenFileDialog();
+            if (ofd.ShowDialog() == DialogResult.OK)
+            {
+                txtFile.Text = ofd.FileName;
+            }
+        }
+
+        private async void btnWrite_Click(object sender, EventArgs e)
+        {
+            var file = txtFile.Text;
+            if (string.IsNullOrWhiteSpace(file) || !File.Exists(file))
+            {
+                MessageBox.Show("请选择有效的文件。", "错误", MessageBoxButtons.OK, MessageBoxIcon.Warning);
+                return;
+            }
+            var upload = txtUpload.Text ?? string.Empty;
+            var download = txtDownload.Text ?? string.Empty;
+            try
+            {
+                var sha = await Task.Run(() => ComputeSha256(file));
+                var payload = new { sha = sha, upload_code = upload, download_code = download };
+                var content = new StringContent(JsonSerializer.Serialize(payload), Encoding.UTF8, "application/json");
+                var resp = await http.PostAsync(ServerUrl + "/write", content);
+                if (resp.IsSuccessStatusCode)
+                {
+                    MessageBox.Show("写入暗码成功", "成功", MessageBoxButtons.OK, MessageBoxIcon.Information);
+                }
+                else
+                {
+                    MessageBox.Show("写入失败: " + await resp.Content.ReadAsStringAsync(), "失败", MessageBoxButtons.OK, MessageBoxIcon.Error);
+                }
+            }
+            catch (Exception ex)
+            {
+                MessageBox.Show("发生错误: " + ex.Message, "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
+            }
+        }
+
+        private static string ComputeSha256(string filePath)
+        {
+            using var sha = SHA256.Create();
+            using var stream = File.OpenRead(filePath);
+            var hash = sha.ComputeHash(stream);
+            var sb = new StringBuilder();
+            foreach (var b in hash) sb.Append(b.ToString("x2"));
+            return sb.ToString();
+        }
+    }
+}