chore: stub out resolver which will be main entry point of the package

.editorconfig

@@ -34,6 +34,9 @@ insert_final_newline = false
 #### .NET Coding Conventions ####
 [*.{cs,vb}]
 
+# Analyzer settings
+dotnet_diagnostic.CA1822.severity = none
+
 # Organize usings
 dotnet_separate_import_directive_groups = true
 dotnet_sort_system_directives_first = true

scripts/test.ps1

@@ -1,22 +1,36 @@
-Write-Host "Starting test execution..." -ForegroundColor Magenta
-Write-Host ""
+$RepoRoot = Resolve-Path (Join-Path -Path $PSScriptRoot -ChildPath "..")
 
-dotnet test
+Push-Location -Path $RepoRoot
 
+try {
+  Write-Host "Starting test execution..." -ForegroundColor Magenta
+  Write-Host ""
 
-$TestExitCode = $LASTEXITCODE
+  $TestResultsPath = Join-Path -Path $RepoRoot -ChildPath "TestResults"
 
-if ($TestExitCode -eq 0) {
-    Write-Host ""
-    Write-Host "Tests passed. Generating code coverage HTML report..." -ForegroundColor Magenta
-    Write-Host ""
+  if (Test-Path $TestResultsPath) {
+    Remove-Item -Path $TestResultsPath -Recurse -Force
+  }
 
-    reportgenerator -reports:"**/*.cobertura.xml" -targetdir:"CoverageReport"
+  dotnet test
 
-    Write-Host ""
-    Write-Host "SUCCESS: All tests passed and coverage report generated." -ForegroundColor Green
-} else {
-    Write-Host "FAILURE: Tests failed with exit code $TestExitCode. Skipping coverage report generation." -ForegroundColor Red
+  $TestExitCode = $LASTEXITCODE
+
+  if ($TestExitCode -eq 0) {
+      Write-Host ""
+      Write-Host "Tests passed. Generating code coverage HTML report..." -ForegroundColor Magenta
+      Write-Host ""
+
+      reportgenerator -reports:"**/*.cobertura.xml" -targetdir:"CoverageReport"
+
+      Write-Host ""
+      Write-Host "SUCCESS: All tests passed and coverage report generated." -ForegroundColor Green
+  } else {
+      Write-Host "FAILURE: Tests failed with exit code $TestExitCode. Skipping coverage report generation." -ForegroundColor Red
+  }
+}
+finally {
+  Pop-Location
 }
 
 exit $TestExitCode

src/StevanFreeborn.Atproto.IdentityResolver/AtprotoId.cs

@@ -0,0 +1,132 @@
+namespace StevanFreeborn.Atproto.IdentityResolver;
+
+/// <summary>
+///
+/// </summary>
+public abstract class AtprotoId
+{
+  /// <summary>
+  ///
+  /// </summary>
+  public string Value { get; protected set; } = string.Empty;
+
+  /// <summary>
+  ///
+  /// </summary>
+  public static AtprotoId From(string atprotoId)
+  {
+    if (string.IsNullOrEmpty(atprotoId))
+    {
+      throw new ArgumentException("Cannot be null or empty", nameof(atprotoId));
+    }
+
+    if (IsDomain(atprotoId))
+    {
+      return Handle.From(atprotoId);
+    }
+
+    return Did.From(atprotoId);
+  }
+
+  private static bool IsDomain(string did)
+  {
+    var hostType = Uri.CheckHostName(did);
+    return hostType == UriHostNameType.Dns && did.Contains('.', StringComparison.OrdinalIgnoreCase);
+  }
+
+}
+
+/// <summary>
+///
+/// </summary>
+public class Did : AtprotoId
+{
+  private static readonly string[] ValidPrefixes = ["did:web:", "did:plc:"];
+
+  /// <summary>
+  ///
+  /// </summary>
+  public string Method { get; private set; }
+
+  private Did(string did)
+  {
+    if (string.IsNullOrEmpty(did))
+    {
+      throw new ArgumentException("Cannot be null or empty", nameof(did));
+    }
+
+    if (TryParseWithoutPrefix(did, out var prefix, out var didWithoutPrefix) is false)
+    {
+      throw new ArgumentException($"Must be did with one of these methods: {string.Join(',', ValidPrefixes)}", nameof(did));
+    }
+
+    if (string.IsNullOrEmpty(didWithoutPrefix))
+    {
+      throw new ArgumentException("Must not be null or empty without did method prefix", nameof(did));
+    }
+
+    // Method should probably be a strongly
+    // typed object
+    Method = prefix.Contains("web", StringComparison.OrdinalIgnoreCase) ? "web" : "plc";
+    Value = did;
+  }
+
+  /// <summary>
+  ///
+  /// </summary>
+  public static new Did From(string did)
+  {
+    return new(did);
+  }
+
+  private static bool TryParseWithoutPrefix(
+    string did,
+    out string prefix,
+    out string didWithoutPrefix
+  )
+  {
+    prefix = string.Empty;
+    didWithoutPrefix = string.Empty;
+
+    foreach (var validPrefix in ValidPrefixes)
+    {
+      if (did.StartsWith(validPrefix, StringComparison.OrdinalIgnoreCase))
+      {
+        prefix = did[..validPrefix.Length];
+        didWithoutPrefix = did[validPrefix.Length..];
+        return true;
+      }
+    }
+
+    return false;
+  }
+}
+
+/// <summary>
+///
+/// </summary>
+public class Handle : AtprotoId
+{
+  private Handle(string handle)
+  {
+    if (string.IsNullOrEmpty(handle))
+    {
+      throw new ArgumentException("Cannot be null or empty", nameof(handle));
+    }
+
+    if (handle.StartsWith('@'))
+    {
+      throw new ArgumentException("Cannot start with @", nameof(handle));
+    }
+
+    Value = handle;
+  }
+
+  /// <summary>
+  ///
+  /// </summary>
+  public static new Handle From(string handle)
+  {
+    return new(handle);
+  }
+}

src/StevanFreeborn.Atproto.IdentityResolver/Greeter.cs

@@ -1,9 +0,0 @@
-namespace StevanFreeborn.Atproto.IdentityResolver;
-
-internal class Greeter
-{
-  public static string SayHello()
-  {
-    return "Hi!";
-  }
-}

src/StevanFreeborn.Atproto.IdentityResolver/IResolver.cs

@@ -0,0 +1,12 @@
+namespace StevanFreeborn.Atproto.IdentityResolver;
+
+/// <summary>
+///
+/// </summary>
+public interface IResolver
+{
+  /// <summary>
+  ///
+  /// </summary>
+  Task<DidDocument> ResolveOrThrowAsync(AtprotoId atprotoId, CancellationToken ct);
+}

src/StevanFreeborn.Atproto.IdentityResolver/Resolver.cs

@@ -0,0 +1,35 @@
+namespace StevanFreeborn.Atproto.IdentityResolver;
+
+/// <inheritdoc />
+public class Resolver : IResolver
+{
+  /// <inheritdoc />
+  public Task<DidDocument> ResolveOrThrowAsync(AtprotoId atprotoId, CancellationToken ct)
+  {
+    // you need to retrieve the did document based on what you got
+    // if you have domain
+    //   you are going to try to retrieve the did
+    //   either through using /.well-known/did.json
+    //   or looking for _atproto.domain txt record
+    //
+    // you now for sure have a did
+    //   check method
+    //     if method is web
+    //        retrieve doc from domain/.well-known/did.json
+    //     if method is plc
+    //        retrieve doc from plc.directory/{did}
+    //   you now have the document
+    //     extract alsoKnownAs which is the handle
+    //       make sure you can get back the same did
+    //       from the handle's domain at /.well-known/did.json
+    //       or _atproto.domain txt record
+
+    return Task.FromResult(new DidDocument());
+  }
+
+}
+
+/// <summary>
+///
+/// </summary>
+public class DidDocument();

tests/.editorconfig

@@ -1,2 +1,3 @@
 [*.cs]
 dotnet_diagnostic.CA1707.severity = none
+dotnet_diagnostic.CA2007.severity = none

tests/StevanFreeborn.Atproto.IdentityResolver.Tests/AtprotoIdTests.cs

@@ -0,0 +1,19 @@
+namespace StevanFreeborn.Atproto.IdentityResolver.Tests;
+
+public class AtprotoIdTests
+{
+  [Theory]
+  [InlineData("")]
+  [InlineData("localhost")]
+  [InlineData("did:web:")]
+  [InlineData("did:plc:")]
+  [InlineData("did:mu:dxbmien5xsrkov5yhywgc4zu")]
+  [InlineData("@stevanfreeborn.com")]
+  [InlineData(null)]
+  public void From_WhenCalledWithInvalidDid_ItShouldThrowInvalidArgumentException(string? atprotoId)
+  {
+    var act = () => AtprotoId.From(atprotoId!);
+
+    act.Should().Throw<ArgumentException>();
+  }
+}

tests/StevanFreeborn.Atproto.IdentityResolver.Tests/GreeterTests.cs

@@ -1,10 +0,0 @@
-namespace StevanFreeborn.Atproto.IdentityResolver.Tests;
-
-public class GreeterTests
-{
-  [Fact]
-  public void SayHello_WhenCalled_ItShouldReturnHi()
-  {
-    Greeter.SayHello().Should().Be("Hi!");
-  }
-}

tests/StevanFreeborn.Atproto.IdentityResolver.Tests/ResolverTests.cs

@@ -0,0 +1,10 @@
+namespace StevanFreeborn.Atproto.IdentityResolver.Tests;
+
+public class ResolverTests
+{
+  [Fact]
+  public async Task ResolveAsync_WhenCalledWithInvalidDid_ItShouldThrowInvalidArgumentException()
+  {
+    true.Should().BeTrue();
+  }
+}