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136 changes: 136 additions & 0 deletions
136
CS/CalDAVServer.FileSystemStorage.AspNetCore/ExtendedAttributes/ExtendedAttribute.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,136 @@ | ||
| using System; | ||
| using System.IO; | ||
| using System.Runtime.InteropServices; | ||
| using System.Text; | ||
| using System.Threading.Tasks; | ||
|
|
||
| namespace CalDAVServer.FileSystemStorage.AspNetCore.ExtendedAttributes | ||
| { | ||
| /// <summary> | ||
| /// Provides methods for reading and writing extended attributes on files and folders. | ||
| /// NTFS alternate data streams are used to store attributes. | ||
| /// </summary> | ||
| public class ExtendedAttribute : IExtendedAttribute | ||
| { | ||
| private readonly string pathFormat = "{0}:{1}"; | ||
|
|
||
| /// <summary> | ||
| /// Checks extended attribute existence. | ||
| /// </summary> | ||
| /// <param name="path">File or folder path.</param> | ||
| /// <param name="attribName">Attribute name.</param> | ||
| /// <returns>True if attribute exist, false otherwise.</returns> | ||
| public async Task<bool> HasExtendedAttributeAsync(string path, string attribName) | ||
| { | ||
| if (string.IsNullOrEmpty(path)) throw new ArgumentNullException(nameof(path)); | ||
| if (string.IsNullOrEmpty(attribName)) throw new ArgumentNullException(nameof(attribName)); | ||
|
|
||
| bool attributeExists = true; | ||
| string fullPath = string.Format(pathFormat, path, attribName); | ||
|
|
||
| if (!File.Exists(fullPath)) | ||
| { | ||
| attributeExists = false; | ||
| } | ||
| return attributeExists; | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Deletes extended attribute. | ||
| /// </summary> | ||
| /// <param name="path">File or folder path.</param> | ||
| /// <param name="attribName">Attribute name.</param> | ||
| public async Task DeleteExtendedAttributeAsync(string path, string attribName) | ||
| { | ||
| if (string.IsNullOrEmpty(path)) | ||
| { | ||
| throw new ArgumentNullException("path"); | ||
| } | ||
|
|
||
| if (string.IsNullOrEmpty(attribName)) | ||
| { | ||
| throw new ArgumentNullException("attribName"); | ||
| } | ||
|
|
||
| string fullPath = string.Format(pathFormat, path, attribName); | ||
| File.Delete(fullPath); | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Gets extended attribute. | ||
| /// </summary> | ||
| /// <param name="path">File or folder path.</param> | ||
| /// <param name="attribName">Attribute name.</param> | ||
| /// <returns>Attribute value or null if attribute or file not found.</returns> | ||
| public async Task<string> GetExtendedAttributeAsync(string path, string attribName) | ||
| { | ||
| if (string.IsNullOrEmpty(path)) | ||
| { | ||
| throw new ArgumentNullException("path"); | ||
| } | ||
|
|
||
| if (string.IsNullOrEmpty(attribName)) | ||
| { | ||
| throw new ArgumentNullException("attribName"); | ||
| } | ||
|
|
||
| string fullPath = string.Format(pathFormat, path, attribName); | ||
| if (File.Exists(fullPath)) | ||
| { | ||
| await using (FileStream fileStream = File.Open(fullPath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite | FileShare.Delete)) | ||
| using (StreamReader streamReader = new StreamReader(fileStream)) | ||
| { | ||
| return await streamReader.ReadToEndAsync(); | ||
| } | ||
| } | ||
|
|
||
| return null; | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Sets extended attribute. | ||
| /// </summary> | ||
| /// <param name="path">File or folder path.</param> | ||
| /// <param name="attribName">Attribute name.</param> | ||
| /// <param name="attribValue">Attribute value.</param> | ||
| public async Task SetExtendedAttributeAsync(string path, string attribName, string attribValue) | ||
| { | ||
| if (string.IsNullOrEmpty(path)) | ||
| { | ||
| throw new ArgumentNullException("path"); | ||
| } | ||
|
|
||
| if (string.IsNullOrEmpty(attribName)) | ||
| { | ||
| throw new ArgumentNullException("attribName"); | ||
| } | ||
|
|
||
| if (attribValue == null) | ||
| { | ||
| throw new ArgumentNullException("attribValue"); | ||
| } | ||
|
|
||
| string fullPath = string.Format(pathFormat, path, attribName); | ||
| await using (FileStream fileStream = File.Open(fullPath, FileMode.Create, FileAccess.Write, FileShare.ReadWrite | FileShare.Delete)) | ||
| await using (StreamWriter streamWriter = new StreamWriter(fileStream)) | ||
| { | ||
| await streamWriter.WriteAsync(attribValue); | ||
| } | ||
| } | ||
|
|
||
| public Task DeleteExtendedAttributes(string path) | ||
| { | ||
| throw new NotImplementedException(); | ||
| } | ||
|
|
||
| public Task MoveExtendedAttributes(string sourcePath, string destinationPath) | ||
| { | ||
| throw new NotImplementedException(); | ||
| } | ||
|
|
||
| public Task CopyExtendedAttributes(string sourcePath, string destinationPath) | ||
| { | ||
| throw new NotImplementedException(); | ||
| } | ||
| } | ||
| } |
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