82 lines
2.9 KiB
C#
82 lines
2.9 KiB
C#
using System.IO;
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using System.Linq;
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using System.Text;
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using Yavsc.ViewModels.UserFiles;
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using System;
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namespace Yavsc.Helpers
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{
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public static class AbstractFileSystemHelpers
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{
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public static string UserBillsDirName { set; get; }
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public static string UserFilesDirName { set; get; }
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/// <summary>
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/// Is Valid this Path?
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/// Return true when given value is a valid user file sub-path,
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/// regarding chars used to specify it.
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/// </summary>
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/// <param name="path">Path to validate</param>
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/// <returns></returns>
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public static bool IsValidYavscPath(this string path)
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{
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if (string.IsNullOrEmpty(path)) return true;
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// disallow full path specification
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if (path[0]==Path.DirectorySeparatorChar) return false;
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foreach (var name in path.Split(Path.DirectorySeparatorChar))
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{
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if (!IsValidDirectoryName(name) || name.Equals("..") || name.Equals("."))
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return false;
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}
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// disallow trailling slash
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if (path[path.Length-1]==RemoteDirectorySeparator) return false;
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return true;
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}
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public static bool IsValidDirectoryName(this string name)
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{
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return !name.Any(c => !ValidFileNameChars.Contains(c));
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}
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// Ensure this path is canonical,
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// No "dirto/./this", neither "dirt/to/that/"
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// no .. and each char must be listed as valid in constants
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public static string FilterFileName(string fileName)
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{
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if (fileName==null) return null;
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StringBuilder sb = new StringBuilder();
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foreach (var c in fileName)
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{
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if (ValidFileNameChars.Contains(c))
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sb.Append(c);
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else sb.Append('_');
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}
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return sb.ToString();
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}
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public static UserDirectoryInfo GetUserFiles(string userName, string subdir)
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{
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UserDirectoryInfo di = new UserDirectoryInfo(UserFilesDirName, userName, subdir);
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return di;
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}
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public static bool IsRegularFile(string userName, string subdir)
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{
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FileInfo fi = new FileInfo( Path.Combine(Path.Combine(UserFilesDirName, userName), subdir));
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return fi.Exists;
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}
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// Server side only supports POSIX file systems
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public const char RemoteDirectorySeparator = '/';
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// Only accept descent remote file names
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public static char[] ValidFileNameChars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-=_~. ".ToCharArray();
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// Estimate signature file name format
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public static Func<string,string,long,string>
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SignFileNameFormat = new Func<string,string,long,string> ((signType,billingCode,estimateId) => $"sign-{billingCode}-{signType}-{estimateId}.png");
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}
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}
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