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using System.Security.AccessControl;
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namespace PCL.Core.IO;
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using System.Threading;
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using System.Threading.Tasks;
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using Logging;
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public static class Directories {
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/// <summary>
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/// 异步检查是否拥有对指定文件夹的读写权限。
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/// 如果文件夹不存在或没有权限，返回 false，不修改文件系统。
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/// </summary>
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/// <param name="path">要检查的文件夹路径。</param>
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/// <param name="cancellationToken">取消操作的令牌。</param>
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/// <returns>如果拥有读写权限且文件夹存在，返回 true；否则返回 false。</returns>
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public static async Task<bool> CheckPermissionAsync(string? path, CancellationToken cancellationToken = default) {
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try {
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if (string.IsNullOrWhiteSpace(path)) {
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return false;
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}
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// 排除特殊系统文件夹
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if (IsSystemProtectedFolder(path)) {
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return false;
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}
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// 检查文件夹是否存在
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if (!Directory.Exists(path)) {
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return false;
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}
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// 检查目录访问权限
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var directoryInfo = new DirectoryInfo(path);
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var security = await Task.Run(() => directoryInfo.GetAccessControl(), cancellationToken);
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var rules = security.GetAccessRules(true, true, typeof(System.Security.Principal.NTAccount));
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// 检查当前用户是否有读写权限，优先考虑拒绝规则
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var currentUser = System.Security.Principal.WindowsIdentity.GetCurrent();
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var principal = new System.Security.Principal.WindowsPrincipal(currentUser);
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var isDenied = false;
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var isAllowed = false;
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foreach (FileSystemAccessRule rule in rules) {
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if (!rule.FileSystemRights.HasFlag(FileSystemRights.Write))
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continue;
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// 检查规则是否适用于当前用户或其组
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if (principal.IsInRole(rule.IdentityReference.Value)) {
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if (rule.AccessControlType == AccessControlType.Deny) {
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isDenied = true;
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break; // 拒绝优先，直接返回
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}
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if (rule.AccessControlType == AccessControlType.Allow) {
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isAllowed = true;
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}
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}
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}
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if (isDenied || !isAllowed) {
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return false;
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}
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// 尝试枚举目录内容以确认实际访问能力
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await Task.Run(() => Directory.EnumerateFiles(path, "*", SearchOption.TopDirectoryOnly).Any(), cancellationToken);
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return true;
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} catch (OperationCanceledException) {
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LogWrapper.Warn("权限检查被取消");
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return false;
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} catch (Exception ex) {
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LogWrapper.Warn(ex, $"没有对文件夹 {path} 的权限，请尝试以管理员权限运行。");
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return false;
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}
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}
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/// <summary>
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/// 异步检查文件夹权限，若无权限或文件夹不存在则抛出异常。
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/// 不修改文件系统。
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/// </summary>
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/// <param name="path">要检查的文件夹路径。</param>
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/// <param name="cancellationToken">取消操作的令牌。</param>
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/// <exception cref="ArgumentNullException">路径为空或只包含空白字符。</exception>
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/// <exception cref="DirectoryNotFoundException">文件夹不存在。</exception>
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/// <exception cref="UnauthorizedAccessException">无访问权限。</exception>
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/// <exception cref="OperationCanceledException">操作被取消。</exception>
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public static async Task CheckPermissionWithExceptionAsync(string? path, CancellationToken cancellationToken = default) {
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if (string.IsNullOrWhiteSpace(path)) {
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throw new ArgumentNullException(nameof(path), "文件夹路径不能为空！");
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}
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if (IsSystemProtectedFolder(path)) {
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throw new UnauthorizedAccessException($"无法访问受保护的系统文件夹：{path}");
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}
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if (!Directory.Exists(path)) {
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throw new DirectoryNotFoundException($"文件夹不存在：{path}");
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}
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try {
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var directoryInfo = new DirectoryInfo(path);
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var security = await Task.Run(() => directoryInfo.GetAccessControl(), cancellationToken);
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var rules = security.GetAccessRules(true, true, typeof(System.Security.Principal.NTAccount));
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var hasAccess = rules.Cast<FileSystemAccessRule>()
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.Any(rule => rule.FileSystemRights.HasFlag(FileSystemRights.Write) &&
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rule.AccessControlType == AccessControlType.Allow);
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if (!hasAccess) {
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throw new UnauthorizedAccessException($"没有对文件夹 {path} 的写权限");
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}
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// 确认实际访问能力
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await Task.Run(() => Directory.EnumerateFiles(path, "*", SearchOption.TopDirectoryOnly).Any(), cancellationToken);
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} catch (UnauthorizedAccessException) {
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throw;
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} catch (OperationCanceledException) {
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throw;
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} catch (Exception ex) {
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throw new UnauthorizedAccessException($"无法访问文件夹 {path}：{ex.Message}", ex);
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}
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}
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/// <summary>
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/// 检查是否为受保护的系统文件夹。
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/// </summary>
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private static bool IsSystemProtectedFolder(string path) {
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return path.EndsWith(":\\System Volume Information", StringComparison.OrdinalIgnoreCase) ||
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path.EndsWith(":\\$RECYCLE.BIN", StringComparison.OrdinalIgnoreCase);
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}
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/// <summary>
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/// 异步删除文件夹及其内容，返回删除的文件数。支持忽略错误。
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/// </summary>
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/// <param name="path">要删除的文件夹路径。</param>
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/// <param name="ignoreIssue">是否忽略删除过程中的错误。</param>
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/// <param name="cancellationToken">取消操作的令牌。</param>
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/// <returns>成功删除的文件数。</returns>
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/// <exception cref="OperationCanceledException">操作被取消。</exception>
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public static async Task<int> DeleteDirectoryAsync(string? path, bool ignoreIssue = false, CancellationToken cancellationToken = default) {
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if (string.IsNullOrEmpty(path) || !Directory.Exists(path)) {
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return 0;
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}
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var deletedCount = 0;
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try {
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// 枚举文件，延迟加载以提高性能
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foreach (var filePath in Directory.EnumerateFiles(path)) {
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cancellationToken.ThrowIfCancellationRequested();
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for (var attempt = 0; attempt < 2; attempt++) {
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try {
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await FileDeleteAsync(filePath, cancellationToken).ConfigureAwait(false);
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deletedCount++;
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break;
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} catch (Exception ex) when (attempt == 0) {
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LogWrapper.Error(ex, $"删除文件失败，将在 0.3s 后重试（{filePath}）");
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await Task.Delay(300, cancellationToken).ConfigureAwait(false);
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} catch (Exception ex) {
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if (ignoreIssue) {
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LogWrapper.Error(ex, "删除单个文件可忽略地失败");
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} else {
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throw;
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}
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}
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}
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}
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// 递归删除子目录
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foreach (var subDir in Directory.EnumerateDirectories(path)) {
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cancellationToken.ThrowIfCancellationRequested();
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deletedCount += await DeleteDirectoryAsync(subDir, ignoreIssue, cancellationToken).ConfigureAwait(false);
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}
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// 删除空目录
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for (var attempt = 0; attempt < 2; attempt++) {
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try {
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Directory.Delete(path, true);
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break;
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} catch (Exception ex) when (attempt == 0) {
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LogWrapper.Error(ex, $"删除文件夹失败，将在 0.3s 后重试（{path}）");
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await Task.Delay(300, cancellationToken).ConfigureAwait(false);
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} catch (Exception ex) {
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if (ignoreIssue) {
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LogWrapper.Error(ex, "删除单个文件夹可忽略地失败");
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} else {
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throw;
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}
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}
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}
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} catch (DirectoryNotFoundException ex) {
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// 处理疑似符号链接的情况
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LogWrapper.Error(ex, $"疑似为孤立符号链接，尝试直接删除（{path}）", "Developer");
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try {
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Directory.Delete(path);
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} catch (Exception deleteEx) {
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if (!ignoreIssue) {
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throw;
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}
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LogWrapper.Error(deleteEx, $"删除符号链接文件夹失败（{path}）");
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}
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}
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return deletedCount;
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}
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/// <summary>
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/// 异步复制文件夹及其内容，失败时抛出异常。
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/// </summary>
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/// <param name="fromPath">源文件夹路径。</param>
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/// <param name="toPath">目标文件夹路径。</param>
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/// <param name="progressIncrementHandler">进度更新回调，接收 0 到 1 的进度值。</param>
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/// <param name="cancellationToken">取消操作的令牌。</param>
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/// <exception cref="ArgumentNullException">源或目标文件夹路径为空。</exception>
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/// <exception cref="OperationCanceledException">操作被取消。</exception>
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public static async Task CopyDirectoryAsync(string? fromPath, string? toPath, Action<double>? progressIncrementHandler = null, CancellationToken cancellationToken = default) {
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if (string.IsNullOrEmpty(fromPath)) {
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throw new ArgumentNullException(nameof(fromPath), "源文件夹路径为空");
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}
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if (string.IsNullOrEmpty(toPath)) {
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throw new ArgumentNullException(nameof(toPath), "目标文件夹路径为空");
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}
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// 规范化路径
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fromPath = Path.GetFullPath(fromPath).TrimEnd(Path.DirectorySeparatorChar, Path.AltDirectorySeparatorChar) + Path.DirectorySeparatorChar;
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toPath = Path.GetFullPath(toPath).TrimEnd(Path.DirectorySeparatorChar, Path.AltDirectorySeparatorChar) + Path.DirectorySeparatorChar;
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var allFiles = (await EnumerateFilesAsync(fromPath, cancellationToken).ConfigureAwait(false)).ToList();
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var totalFiles = allFiles.Count;
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long copiedFiles = 0;
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foreach (var file in allFiles) {
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cancellationToken.ThrowIfCancellationRequested();
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var relativePath = file.FullName[fromPath.Length..];
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var destFilePath = Path.Combine(toPath, relativePath);
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// 确保目标目录存在
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Directory.CreateDirectory(Path.GetDirectoryName(destFilePath)!);
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for (var attempt = 0; attempt < 2; attempt++) {
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try {
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await FileCopyAsync(file.FullName, destFilePath, overwrite: true, cancellationToken).ConfigureAwait(false);
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copiedFiles++;
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progressIncrementHandler?.Invoke((double)copiedFiles / totalFiles);
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break;
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} catch (Exception ex) when (attempt == 0) {
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LogWrapper.Error(ex, $"复制文件失败，将在 0.3s 后重试（{file.FullName} 到 {destFilePath}）");
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await Task.Delay(300, cancellationToken).ConfigureAwait(false);
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} catch (Exception ex) {
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LogWrapper.Error(ex, $"复制文件失败（{file.FullName} 到 {destFilePath}）");
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throw;
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}
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}
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}
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}
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/// <summary>
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/// 异步遍历文件夹中的所有文件。
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/// </summary>
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/// <param name="directory">要遍历的文件夹路径。</param>
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/// <param name="cancellationToken">取消操作的令牌。</param>
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/// <returns>文件信息的枚举器。</returns>
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public static async Task<IEnumerable<FileInfo>> EnumerateFilesAsync(string? directory, CancellationToken cancellationToken = default) {
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if (string.IsNullOrEmpty(directory) || !Directory.Exists(directory)) {
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throw new DirectoryNotFoundException($"目录不存在：{directory}");
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}
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try {
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// DirectoryInfo.EnumerateFiles 是同步的，使用 Task.Run 包装
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return await Task.Run(() => new DirectoryInfo(directory).EnumerateFiles("*", SearchOption.AllDirectories).ToList(), cancellationToken).ConfigureAwait(false);
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} catch (OperationCanceledException) {
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LogWrapper.Warn("文件夹遍历被取消");
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return [];
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} catch (Exception ex) {
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LogWrapper.Error(ex, $"遍历文件夹失败（{directory}）");
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return [];
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}
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}
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// 辅助方法：异步打开 FileStream
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private static async Task<FileStream> FileStreamOpenAsync(string path, FileMode mode, FileAccess access, FileShare share, CancellationToken cancellationToken) {
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var fs = new FileStream(path, mode, access, share, bufferSize: 4096, useAsync: true);
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await Task.Yield(); // 确保异步上下文
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cancellationToken.ThrowIfCancellationRequested();
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return fs;
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}
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// 辅助方法：异步删除文件
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private static async Task FileDeleteAsync(string path, CancellationToken cancellationToken) {
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await Task.Run(() => File.Delete(path), cancellationToken).ConfigureAwait(false);
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}
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// 辅助方法：异步复制文件
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private static async Task FileCopyAsync(string sourceFileName, string destFileName, bool overwrite, CancellationToken cancellationToken) {
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await using FileStream sourceStream = new(sourceFileName, FileMode.Open, FileAccess.Read, FileShare.Read, 4096, useAsync: true);
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await using FileStream destStream = new(destFileName, overwrite ? FileMode.Create : FileMode.CreateNew, FileAccess.Write, FileShare.None, 4096, useAsync: true);
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await sourceStream.CopyToAsync(destStream, cancellationToken).ConfigureAwait(false);
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}
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}
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