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paul-fresquetpaul-fresquet
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[refactor] Separate noise filtering and centralize noise file detection (#277)
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‎docs/specs/SPEC-noise-file-detection.md‎

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# Noise File Detection Specification
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## Purpose
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This document lists the known noise file names filtered by the client inventory pipeline and their platform origin.
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The runtime source of truth is the embedded JSON resource:
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`src/ByteSync.Client/Services/Inventories/noise-files.json`.
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## Known noise file names
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| File name | Origin platform | Typical purpose |
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| --- | --- | --- |
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| `desktop.ini` | Windows | Folder customization metadata |
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| `thumbs.db` | Windows | Thumbnail cache |
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| `ehthumbs.db` | Windows | Media Center thumbnail cache |
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| `ehthumbs_vista.db` | Windows | Vista Media Center thumbnail cache |
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| `.desktop.ini` | Windows/Linux legacy compatibility | Legacy hidden variant |
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| `.thumbs.db` | Windows/Linux legacy compatibility | Legacy hidden variant |
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| `.DS_Store` | macOS | Finder metadata |
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| `.AppleDouble` | macOS | Resource fork metadata |
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| `.LSOverride` | macOS | Launch Services overrides |
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| `.Spotlight-V100` | macOS | Spotlight indexing data |
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| `.Trashes` | macOS | Trash metadata or folder marker |
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| `.fseventsd` | macOS | File system event metadata |
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| `.TemporaryItems` | macOS | Temporary items marker |
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| `.VolumeIcon.icns` | macOS | Custom volume icon |
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| `.directory` | Linux (KDE) | Directory display metadata |
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## Matching behavior
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- On Linux, matching is case-sensitive.
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- On non-Linux platforms, matching is case-insensitive.

‎src/ByteSync.Client/ByteSync.Client.csproj‎

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</EmbeddedResource>
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<None Remove="local.settings.json"/>
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<EmbeddedResource Include="local.settings.json"/>
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<EmbeddedResource Include="Services\Inventories\noise-files.json"/>
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</ItemGroup>
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<ItemGroup>
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<UpToDateCheckInput Remove="Assets\Resources\Resources.en.resx"/>
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<SubType>Code</SubType>
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</Compile>
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</ItemGroup>
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</Project>
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</Project>

‎src/ByteSync.Client/Services/Inventories/FileSystemInspector.cs‎

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@@ -63,13 +63,7 @@ public bool IsSystemAttribute(FileInfo fileInfo)
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public bool IsNoiseFileName(FileInfo fileInfo, OSPlatforms os)
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{
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var comparison = os == OSPlatforms.Linux ? StringComparison.Ordinal : StringComparison.OrdinalIgnoreCase;
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return fileInfo.Name.Equals("desktop.ini", comparison)
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|| fileInfo.Name.Equals("thumbs.db", comparison)
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|| fileInfo.Name.Equals(".desktop.ini", comparison)
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|| fileInfo.Name.Equals(".thumbs.db", comparison)
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|| fileInfo.Name.Equals(".DS_Store", comparison);
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return NoiseFileDetector.IsNoiseFileName(fileInfo.Name, os);
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}
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public bool IsReparsePoint(FileSystemInfo fsi)
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return false;
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}
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}
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}
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}

‎src/ByteSync.Client/Services/Inventories/NoiseFileDetector.cs‎

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using System.Reflection;
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using System.Text.Json;
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using ByteSync.Common.Business.Misc;
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namespace ByteSync.Services.Inventories;
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public static class NoiseFileDetector
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{
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private const string NoiseFileResourceSuffix = ".Services.Inventories.noise-files.json";
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private static readonly string[] KnownNoiseFileNames = LoadNoiseFileNames();
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private static readonly HashSet<string> CaseSensitiveNoiseFileNames = new(KnownNoiseFileNames, StringComparer.Ordinal);
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private static readonly HashSet<string> CaseInsensitiveNoiseFileNames = new(KnownNoiseFileNames, StringComparer.OrdinalIgnoreCase);
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public static bool IsNoiseFileName(string? fileName, OSPlatforms os)
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{
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if (string.IsNullOrWhiteSpace(fileName))
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{
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return false;
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}
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return os == OSPlatforms.Linux
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? CaseSensitiveNoiseFileNames.Contains(fileName)
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: CaseInsensitiveNoiseFileNames.Contains(fileName);
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}
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private static string[] LoadNoiseFileNames()
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{
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var assembly = typeof(NoiseFileDetector).Assembly;
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var resourceName = assembly.GetManifestResourceNames()
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.Single(rn => rn.EndsWith(NoiseFileResourceSuffix, StringComparison.Ordinal));
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using var stream = assembly.GetManifestResourceStream(resourceName);
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ArgumentNullException.ThrowIfNull(stream);
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var parsed = JsonSerializer.Deserialize<string[]>(stream);
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ArgumentNullException.ThrowIfNull(parsed);
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return parsed
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.Where(s => !string.IsNullOrWhiteSpace(s))
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.Distinct(StringComparer.Ordinal)
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.ToArray();
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}
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}

‎src/ByteSync.Client/Services/Inventories/noise-files.json‎

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[
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"desktop.ini",
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"thumbs.db",
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"ehthumbs.db",
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"ehthumbs_vista.db",
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".desktop.ini",
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".thumbs.db",
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".DS_Store",
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".AppleDouble",
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".LSOverride",
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".Spotlight-V100",
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".Trashes",
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".fseventsd",
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".TemporaryItems",
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".VolumeIcon.icns",
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".directory"
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]

‎tests/ByteSync.Client.UnitTests/Services/Inventories/FileSystemInspectorTests.cs‎

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using ByteSync.Business.Inventories;
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using ByteSync.Common.Business.Misc;
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using ByteSync.Interfaces.Controls.Inventories;
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using ByteSync.Services.Inventories;
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using FluentAssertions;
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Directory.Delete(tempDirectory.FullName, true);
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}
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}
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}
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[Test]
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public void IsNoiseFileName_ShouldReturnTrue_ForKnownNoiseFile()
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{
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var inspector = new FileSystemInspector();
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var tempDirectory = Directory.CreateDirectory(Path.Combine(Path.GetTempPath(), Guid.NewGuid().ToString("N")));
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var filePath = Path.Combine(tempDirectory.FullName, "thumbs.db");
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File.WriteAllText(filePath, "x");
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var fileInfo = new FileInfo(filePath);
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try
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{
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var result = inspector.IsNoiseFileName(fileInfo, OSPlatforms.Windows);
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result.Should().BeTrue();
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}
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finally
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{
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Directory.Delete(tempDirectory.FullName, true);
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}
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}
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[Test]
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public void IsNoiseFileName_ShouldReturnFalse_ForUnknownFile()
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{
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var inspector = new FileSystemInspector();
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var tempDirectory = Directory.CreateDirectory(Path.Combine(Path.GetTempPath(), Guid.NewGuid().ToString("N")));
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var filePath = Path.Combine(tempDirectory.FullName, "regular.txt");
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File.WriteAllText(filePath, "x");
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var fileInfo = new FileInfo(filePath);
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try
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{
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var result = inspector.IsNoiseFileName(fileInfo, OSPlatforms.Windows);
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result.Should().BeFalse();
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}
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finally
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{
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Directory.Delete(tempDirectory.FullName, true);
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}
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}
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}

‎tests/ByteSync.Client.UnitTests/Services/Inventories/NoiseFileDetectorTests.cs‎

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using System.Text.Json;
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using ByteSync.Common.Business.Misc;
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using ByteSync.Services.Inventories;
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using FluentAssertions;
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using NUnit.Framework;
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namespace ByteSync.Client.UnitTests.Services.Inventories;
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public class NoiseFileDetectorTests
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{
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private static readonly string[] KnownNoiseFileNames = LoadNoiseFileNamesFromEmbeddedResource();
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[TestCaseSource(nameof(KnownNoiseFileNames))]
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public void IsNoiseFileName_ShouldReturnTrue_ForKnownNoiseFiles_OnWindows(string fileName)
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{
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var result = NoiseFileDetector.IsNoiseFileName(fileName, OSPlatforms.Windows);
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result.Should().BeTrue();
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}
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[TestCaseSource(nameof(KnownNoiseFileNames))]
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public void IsNoiseFileName_ShouldReturnTrue_ForKnownNoiseFiles_OnLinux(string fileName)
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{
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var result = NoiseFileDetector.IsNoiseFileName(fileName, OSPlatforms.Linux);
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result.Should().BeTrue();
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}
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[TestCase("DESKTOP.INI")]
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[TestCase("THUMBS.DB")]
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[TestCase("EHTHUMBS.DB")]
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[TestCase("EHTHUMBS_VISTA.DB")]
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[TestCase(".ds_store")]
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[TestCase(".appledouble")]
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[TestCase(".lsoverride")]
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[TestCase(".spotlight-v100")]
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[TestCase(".trashes")]
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[TestCase(".FSEVENTSD")]
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[TestCase(".temporaryitems")]
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[TestCase(".volumeicon.icns")]
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[TestCase(".DIRECTORY")]
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public void IsNoiseFileName_ShouldBeCaseInsensitive_OnNonLinuxPlatforms(string fileName)
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{
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var windowsResult = NoiseFileDetector.IsNoiseFileName(fileName, OSPlatforms.Windows);
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var macResult = NoiseFileDetector.IsNoiseFileName(fileName, OSPlatforms.MacOs);
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windowsResult.Should().BeTrue();
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macResult.Should().BeTrue();
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}
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[TestCase("DESKTOP.INI")]
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[TestCase("THUMBS.DB")]
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[TestCase("EHTHUMBS.DB")]
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[TestCase("EHTHUMBS_VISTA.DB")]
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[TestCase(".ds_store")]
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[TestCase(".appledouble")]
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[TestCase(".lsoverride")]
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[TestCase(".spotlight-v100")]
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[TestCase(".trashes")]
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[TestCase(".FSEVENTSD")]
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[TestCase(".temporaryitems")]
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[TestCase(".volumeicon.icns")]
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[TestCase(".DIRECTORY")]
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public void IsNoiseFileName_ShouldBeCaseSensitive_OnLinux(string fileName)
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{
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var result = NoiseFileDetector.IsNoiseFileName(fileName, OSPlatforms.Linux);
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result.Should().BeFalse();
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}
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[TestCase("readme.md")]
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[TestCase("normal.txt")]
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[TestCase(".gitignore")]
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public void IsNoiseFileName_ShouldReturnFalse_ForUnknownFileNames(string fileName)
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{
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var windowsResult = NoiseFileDetector.IsNoiseFileName(fileName, OSPlatforms.Windows);
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var linuxResult = NoiseFileDetector.IsNoiseFileName(fileName, OSPlatforms.Linux);
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windowsResult.Should().BeFalse();
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linuxResult.Should().BeFalse();
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}
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[TestCase(null)]
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[TestCase("")]
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[TestCase(" ")]
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public void IsNoiseFileName_ShouldReturnFalse_ForEmptyValues(string? fileName)
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{
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var windowsResult = NoiseFileDetector.IsNoiseFileName(fileName, OSPlatforms.Windows);
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var linuxResult = NoiseFileDetector.IsNoiseFileName(fileName, OSPlatforms.Linux);
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windowsResult.Should().BeFalse();
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linuxResult.Should().BeFalse();
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}
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private static string[] LoadNoiseFileNamesFromEmbeddedResource()
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{
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var assembly = typeof(NoiseFileDetector).Assembly;
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var resourceName = assembly.GetManifestResourceNames()
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.SingleOrDefault(rn => rn.EndsWith(".Services.Inventories.noise-files.json", StringComparison.Ordinal));
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resourceName.Should().NotBeNull();
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using var stream = assembly.GetManifestResourceStream(resourceName!);
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stream.Should().NotBeNull();
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var data = JsonSerializer.Deserialize<string[]>(stream!);
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data.Should().NotBeNull();
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return data!;
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}
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}

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