Escape all special suffixes in go file names

CHANGELOG.md

@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 
 - Suppress CS1591 when generating CSharp code and documentation is not available
+- Added file name suffix escaping in Go to avoid generating files with reserved suffixes. [#4407](https://github.com/microsoft/kiota/issues/4407)
 
 ### Changed
 

src/Kiota.Builder/Extensions/StringExtensions.cs

@@ -57,6 +57,15 @@ public static string ShortenFileName(this string name, int length = 251) =>
         (!string.IsNullOrEmpty(name) && name.Length > length) ? HashString(name).ToLowerInvariant() : name;
 #pragma warning restore CA1308
 
+    public static string EscapeSuffix(this string? name, HashSet<string> specialFileNameSuffixes, char separator = '_')
+    {
+        ArgumentNullException.ThrowIfNull(specialFileNameSuffixes);
+        if (string.IsNullOrEmpty(name)) return string.Empty;
+
+        var last = name.Split(separator)[^1];
+        return specialFileNameSuffixes.Contains(last) ? $"{name}_escaped" : name;
+    }
+
     public static string ToSnakeCase(this string? name, char separator = '_')
     {
         if (string.IsNullOrEmpty(name)) return string.Empty;

src/Kiota.Builder/PathSegmenters/GoPathSegmenter.cs

@@ -1,4 +1,5 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
 using System.Linq;
 
 using Kiota.Builder.CodeDOM;
@@ -7,6 +8,67 @@
 namespace Kiota.Builder.PathSegmenters;
 public class GoPathSegmenter : CommonPathSegmenter
 {
+    private static readonly HashSet<string> specialFileNameSuffixes = new(StringComparer.OrdinalIgnoreCase) {
+        "test"       ,
+
+        "aix"       ,
+        "android"   ,
+        "darwin"    ,
+        "dragonfly" ,
+        "freebsd"   ,
+        "hurd"      ,
+        "illumos"   ,
+        "ios"       ,
+        "js"        ,
+        "linux"     ,
+        "nacl"      ,
+        "netbsd"    ,
+        "openbsd"   ,
+        "plan9"     ,
+        "solaris"   ,
+        "wasip1"    ,
+        "windows"   ,
+        "zos"       ,
+
+        "aix"       ,
+        "android"   ,
+        "darwin"    ,
+        "dragonfly" ,
+        "freebsd"   ,
+        "hurd"      ,
+        "illumos"   ,
+        "ios"       ,
+        "linux"     ,
+        "netbsd"    ,
+        "openbsd"   ,
+        "solaris"   ,
+
+        "386"         ,
+        "amd64"       ,
+        "amd64p32"    ,
+        "arm"         ,
+        "armbe"       ,
+        "arm64"       ,
+        "arm64be"     ,
+        "loong64"     ,
+        "mips"        ,
+        "mipsle"      ,
+        "mips64"      ,
+        "mips64le"    ,
+        "mips64p32"   ,
+        "mips64p32le" ,
+        "ppc"         ,
+        "ppc64"       ,
+        "ppc64le"     ,
+        "riscv"       ,
+        "riscv64"     ,
+        "s390"        ,
+        "s390x"       ,
+        "sparc"       ,
+        "sparc64"     ,
+        "wasm"        ,
+    };
+
     public GoPathSegmenter(string rootPath, string clientNamespaceName) : base(rootPath, clientNamespaceName) { }
     public override string FileSuffix => ".go";
     public override IEnumerable<string> GetAdditionalSegment(CodeElement currentElement, string fileName)
@@ -17,12 +79,13 @@ public override IEnumerable<string> GetAdditionalSegment(CodeElement currentElem
             _ => Enumerable.Empty<string>(),
         };
     }
+
     public override string NormalizeFileName(CodeElement currentElement)
     {
         return currentElement switch
         {
             CodeNamespace => "go",
-            _ => GetLastFileNameSegment(currentElement).ToSnakeCase().ShortenFileName(),
+            _ => GetLastFileNameSegment(currentElement).ToSnakeCase().EscapeSuffix(specialFileNameSuffixes).ShortenFileName(),
         };
     }
     public override string NormalizeNamespaceSegment(string segmentName) => segmentName?.ToLowerInvariant() ?? string.Empty;

tests/Kiota.Builder.Tests/PathSegmenters/GoPathSegmenterTests.cs

@@ -0,0 +1,42 @@
+using Kiota.Builder.CodeDOM;
+using Kiota.Builder.PathSegmenters;
+using Xunit;
+
+namespace Kiota.Builder.Tests.PathSegmenters;
+
+public class GoPathSegmenterTests
+{
+    private readonly GoPathSegmenter segmenter;
+    public GoPathSegmenterTests()
+    {
+        segmenter = new GoPathSegmenter("D:\\source\\repos\\kiota-sample", "client");
+    }
+
+    [Fact]
+    public void GoPathSegmenterGeneratesCorrectFileName()
+    {
+        var fileName = segmenter.NormalizeFileName(new CodeClass
+        {
+            Name = "testClass"
+        });
+        Assert.Equal("test_class", fileName); // file name should be snake case
+    }
+
+    [Fact]
+    public void GoPathSegmenterGeneratesEscapedSpecialClassName()
+    {
+        var fileName = segmenter.NormalizeFileName(new CodeClass
+        {
+            Name = "adminWindows"
+        });
+        Assert.Equal("admin_windows_escaped", fileName); // file name should be snake case and escaped
+    }
+
+    [Fact]
+    public void GoPathSegmenterGeneratesNamespaceFolderName()
+    {
+        var namespaceName = "Microsoft.Graph";
+        var normalizedNamespace = segmenter.NormalizeNamespaceSegment(namespaceName);
+        Assert.Equal("microsoft.graph", normalizedNamespace);// the file name should be lower case
+    }
+}