Initial curated itworx-knowledge-hub source from 3b1751d0d9dee551aa6994eee0093704dc334817

tests/backend/ItWorx.KnowledgeHub.Domain.Tests/SafeFilenameTests.cs

@@ -0,0 +1,64 @@
+using ItWorx.KnowledgeHub.Domain.Attachments;
+
+namespace ItWorx.KnowledgeHub.Domain.Tests;
+
+public sealed class SafeFilenameTests
+{
+    [Theory]
+    [InlineData("../../../../etc/passwd", "passwd")]
+    [InlineData("..\\..\\windows\\system32\\config", "config")]
+    [InlineData("subdir/verslag.pdf", "verslag.pdf")]
+    public void Create_strips_any_directory_component_and_keeps_only_the_leaf_name(string raw, string expected)
+    {
+        var filename = SafeFilename.Create(raw);
+
+        Assert.Equal(expected, filename.Value);
+    }
+
+    [Fact]
+    public void Create_rejects_a_filename_containing_a_null_byte()
+    {
+        Assert.Throws<ArgumentException>(() => SafeFilename.Create("bestand\0.txt"));
+    }
+
+    [Fact]
+    public void Create_rejects_a_filename_containing_a_control_character()
+    {
+        Assert.Throws<ArgumentException>(() => SafeFilename.Create("bestand.txt"));
+    }
+
+    [Fact]
+    public void Create_rejects_an_empty_or_dot_only_filename()
+    {
+        Assert.Throws<ArgumentException>(() => SafeFilename.Create(""));
+        Assert.Throws<ArgumentException>(() => SafeFilename.Create("."));
+        Assert.Throws<ArgumentException>(() => SafeFilename.Create(".."));
+    }
+
+    [Fact]
+    public void Create_truncates_an_excessively_long_filename()
+    {
+        var raw = new string('a', 400) + ".txt";
+
+        var filename = SafeFilename.Create(raw);
+
+        Assert.True(filename.Value.Length <= SafeFilename.MaximumLength);
+    }
+
+    [Fact]
+    public void AllExtensions_detects_a_double_extension()
+    {
+        var filename = SafeFilename.Create("factuur.pdf.exe");
+
+        Assert.Equal([".pdf", ".exe"], filename.AllExtensions());
+        Assert.Equal(".exe", filename.LastExtension());
+    }
+
+    [Fact]
+    public void LastExtension_is_null_when_there_is_no_extension()
+    {
+        var filename = SafeFilename.Create("readme");
+
+        Assert.Null(filename.LastExtension());
+    }
+}