320 lines
8.3 KiB
C#
320 lines
8.3 KiB
C#
using OrderSupportTicket.Models.Api;
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using OrderSupportTicket.Services;
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using System;
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using System.Globalization;
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using System.IO;
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using System.Windows.Media;
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using System.Windows.Media.Imaging;
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using WPFCommon.Models;
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namespace OrderSupportTicket.ViewModels;
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/// <summary>
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/// 发送留言前已选择、待上传的本地图片。
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/// </summary>
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public sealed class PendingAttachmentViewModel : BindableBaseEx, IDisposable
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{
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private const long MaxImageBytes = TicketApiService.MaxImageBytes;
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private ImageSource _preview;
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private MessageAttachmentReceipt _receipt;
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private string _receiptFingerprint;
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private readonly bool _deleteFileOnDispose;
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private bool _disposed;
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private PendingAttachmentViewModel(
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string filePath,
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string fileName,
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string mimeType,
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long byteSize,
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DateTime lastWriteTimeUtc,
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bool deleteFileOnDispose = false)
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{
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FilePath = filePath;
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FileName = fileName;
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MimeType = mimeType;
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ByteSize = byteSize;
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_deleteFileOnDispose = deleteFileOnDispose;
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Fingerprint = filePath.ToLowerInvariant()
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+ "|"
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+ byteSize.ToString(CultureInfo.InvariantCulture)
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+ "|"
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+ lastWriteTimeUtc.Ticks.ToString(CultureInfo.InvariantCulture);
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Preview = LoadPreview(filePath);
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}
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/// <summary>
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/// 本地绝对路径，仅用于读取并直传，不提交给业务接口。
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/// </summary>
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public string FilePath { get; }
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/// <summary>
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/// 原始文件名。
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/// </summary>
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public string FileName { get; }
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/// <summary>
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/// 图片 MIME 类型。
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/// </summary>
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public string MimeType { get; }
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/// <summary>
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/// 图片字节数。
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/// </summary>
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public long ByteSize { get; }
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/// <summary>
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/// 本地文件内容标识，用于判断是否需要重新上传。
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/// </summary>
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public string Fingerprint { get; }
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/// <summary>
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/// 本地缩略图；WebP 等当前 WPF 解码器不支持时为空。
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/// </summary>
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public ImageSource Preview
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{
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get => _preview;
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private set
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{
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if (SetValue(ref _preview, value))
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RaisePropertyChanged(nameof(HasPreview));
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}
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}
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/// <summary>
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/// 是否已加载本地缩略图。
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/// </summary>
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public bool HasPreview => Preview != null;
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/// <summary>
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/// 当前文件是否已有可复用的上传回执。
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/// </summary>
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public bool HasReceipt =>
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Receipt != null
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&& string.Equals(_receiptFingerprint, Fingerprint, StringComparison.Ordinal);
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/// <summary>
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/// 上传回执；仅在本类内部更新。
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/// </summary>
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public MessageAttachmentReceipt Receipt
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{
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get => _receipt;
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private set
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{
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if (SetValue(ref _receipt, value))
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RaisePropertyChanged(nameof(HasReceipt));
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}
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}
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/// <summary>
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/// 图片大小展示文本。
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/// </summary>
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public string SizeText => FormatSize(ByteSize);
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/// <summary>
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/// 保存本次上传成功的回执，后续网络重试可直接复用。
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/// </summary>
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public void SetReceipt(MessageAttachmentReceipt receipt)
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{
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if (receipt == null)
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throw new ArgumentNullException(nameof(receipt));
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_receiptFingerprint = Fingerprint;
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Receipt = receipt;
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}
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/// <summary>
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/// 清除已失效的上传回执，下次发送时重新申请凭证。
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/// </summary>
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public void ClearReceipt()
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{
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_receiptFingerprint = null;
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Receipt = null;
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}
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/// <summary>
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/// 校验并创建本地待发送图片。
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/// </summary>
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public static bool TryCreate(
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string filePath,
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out PendingAttachmentViewModel attachment,
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out string error)
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{
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attachment = null;
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error = null;
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if (string.IsNullOrWhiteSpace(filePath))
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{
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error = "图片路径为空。";
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return false;
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}
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string fullPath;
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FileInfo file;
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try
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{
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fullPath = Path.GetFullPath(filePath);
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file = new FileInfo(fullPath);
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if (!file.Exists)
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{
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error = "图片文件不存在：" + Path.GetFileName(filePath);
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return false;
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}
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}
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catch (Exception ex)
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{
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error = "无法读取图片文件：" + ex.Message;
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return false;
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}
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if (!TryGetMimeType(file.Extension, out var mimeType))
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{
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error = "仅支持 JPG、PNG、WebP 图片：" + file.Name;
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return false;
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}
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if (file.Length < 1 || file.Length > MaxImageBytes)
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{
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error = "单张图片必须大于 0 且不超过 5 MiB：" + file.Name;
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return false;
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}
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attachment = new PendingAttachmentViewModel(
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fullPath,
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file.Name,
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mimeType,
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file.Length,
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file.LastWriteTimeUtc);
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return true;
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}
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/// <summary>
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/// 将剪贴板位图保存为临时 PNG，并创建可上传的附件。
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/// </summary>
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public static bool TryCreateTemporary(
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BitmapSource bitmap,
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out PendingAttachmentViewModel attachment,
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out string error)
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{
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attachment = null;
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error = null;
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if (bitmap == null)
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{
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error = "剪贴板中没有可用的图片。";
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return false;
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}
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string filePath = null;
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try
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{
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filePath = Path.Combine(
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Path.GetTempPath(),
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"WxOrder-Clipboard-" + Guid.NewGuid().ToString("N") + ".png");
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var encoder = new PngBitmapEncoder();
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encoder.Frames.Add(BitmapFrame.Create(bitmap));
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using (var stream = File.Create(filePath))
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encoder.Save(stream);
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var file = new FileInfo(filePath);
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if (file.Length < 1 || file.Length > MaxImageBytes)
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{
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error = "粘贴的图片必须大于 0 且不超过 5 MiB。";
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TryDelete(filePath);
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return false;
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}
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attachment = new PendingAttachmentViewModel(
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file.FullName,
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"粘贴图片.png",
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"image/png",
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file.Length,
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file.LastWriteTimeUtc,
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deleteFileOnDispose: true);
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return true;
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}
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catch (Exception ex)
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{
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TryDelete(filePath);
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error = "无法读取剪贴板图片：" + ex.Message;
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return false;
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}
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}
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public void Dispose()
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{
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if (_disposed)
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return;
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_disposed = true;
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if (_deleteFileOnDispose)
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TryDelete(FilePath);
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}
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/// <summary>
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/// 根据扩展名映射文档要求的精确 MIME 类型。
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/// </summary>
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public static bool TryGetMimeType(string extension, out string mimeType)
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{
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switch ((extension ?? string.Empty).Trim().ToLowerInvariant())
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{
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case ".jpg":
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case ".jpeg":
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mimeType = "image/jpeg";
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return true;
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case ".png":
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mimeType = "image/png";
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return true;
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case ".webp":
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mimeType = "image/webp";
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return true;
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default:
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mimeType = null;
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return false;
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}
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}
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private static ImageSource LoadPreview(string filePath)
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{
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try
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{
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var image = new BitmapImage();
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using (var stream = File.OpenRead(filePath))
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{
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image.BeginInit();
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image.CacheOption = BitmapCacheOption.OnLoad;
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image.CreateOptions = BitmapCreateOptions.IgnoreColorProfile;
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image.DecodePixelWidth = 160;
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image.StreamSource = stream;
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image.EndInit();
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}
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image.Freeze();
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return image;
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}
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catch
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{
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return null;
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}
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}
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private static void TryDelete(string filePath)
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{
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if (string.IsNullOrWhiteSpace(filePath))
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return;
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try
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{
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if (File.Exists(filePath))
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File.Delete(filePath);
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}
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catch
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{
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// 临时文件清理失败不影响留言发送流程。
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}
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}
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private static string FormatSize(long byteSize)
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{
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if (byteSize >= 1024 * 1024)
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return (byteSize / 1024d / 1024d).ToString("0.0", CultureInfo.CurrentCulture) + " MB";
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if (byteSize >= 1024)
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return (byteSize / 1024d).ToString("0.0", CultureInfo.CurrentCulture) + " KB";
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return byteSize.ToString(CultureInfo.CurrentCulture) + " B";
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}
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}
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