Support oidc authentication (#105)

Author: michael-trusov

Directory.Packages.props

@@ -3,6 +3,7 @@
     <ManagePackageVersionsCentrally>true</ManagePackageVersionsCentrally>
   </PropertyGroup>
   <ItemGroup>
+    <PackageVersion Include="Azure.Identity" Version="1.15.0" />
     <PackageVersion Include="Moq" Version="4.20.72" />
     <PackageVersion Include="Snapshooter.Xunit" Version="0.14.1" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />

src/MongoDB.Extensions.sln

@@ -41,6 +41,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Migration.Tests", "Migratio
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Context.GuidSerializers.Tests", "Context.GuidSerializer.Tests\Context.GuidSerializers.Tests.csproj", "{2E5C44AC-9F56-462F-B0B7-25F5995F5B76}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Oidc", "Oidc\Oidc.csproj", "{A3740BF3-F10A-4F79-95EF-34FA870BCE7F}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -99,6 +101,10 @@ Global
 		{2E5C44AC-9F56-462F-B0B7-25F5995F5B76}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{2E5C44AC-9F56-462F-B0B7-25F5995F5B76}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{2E5C44AC-9F56-462F-B0B7-25F5995F5B76}.Release|Any CPU.Build.0 = Release|Any CPU
+		{A3740BF3-F10A-4F79-95EF-34FA870BCE7F}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{A3740BF3-F10A-4F79-95EF-34FA870BCE7F}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{A3740BF3-F10A-4F79-95EF-34FA870BCE7F}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{A3740BF3-F10A-4F79-95EF-34FA870BCE7F}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE

src/Oidc/Callbacks/MongoOidcCallback.cs

@@ -0,0 +1,33 @@
+using Azure.Core;
+using Azure.Identity;
+using MongoDB.Driver.Authentication.Oidc;
+
+namespace Mongo.DB.Extensions.Context.Oidc;
+
+internal class MongoOidcCallback : IOidcCallback
+{
+    private readonly List<string> _scopes;
+
+    public MongoOidcCallback(List<string> scopes)
+    {
+        _scopes = scopes;
+    }
+
+    public OidcAccessToken GetOidcAccessToken(OidcCallbackParameters parameters, CancellationToken cancellationToken)
+    {
+        var credential = new DefaultAzureCredential();
+
+        var accessToken = credential.GetToken(new TokenRequestContext(_scopes.ToArray())).Token;
+
+        return new(accessToken, expiresIn: null);
+    }
+
+    public async Task<OidcAccessToken> GetOidcAccessTokenAsync(OidcCallbackParameters parameters, CancellationToken cancellationToken)
+    {
+        var credential = new DefaultAzureCredential();
+
+        var accessToken = await credential.GetTokenAsync(new TokenRequestContext(_scopes.ToArray()));
+
+        return new(accessToken.Token, expiresIn: null);
+    }
+}

src/Oidc/Extensions/MongoClientSettingsExtensions.cs

@@ -0,0 +1,11 @@
+using MongoDB.Driver;
+
+namespace Mongo.DB.Extensions.Context.Oidc;
+
+public static class MongoClientSettingsExtensions
+{
+    public static void AddOidcAuthentication(this MongoClientSettings mongoClientSettings, List<string> scopes)
+    {
+        mongoClientSettings.Credential = MongoCredential.CreateOidcCredential(new MongoOidcCallback(scopes));
+    }
+}

src/Oidc/Oidc.csproj

@@ -0,0 +1,17 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <RootNamespace>Mongo.DB.Extensions.Context.Oidc</RootNamespace>
+    <AssemblyName>Mongo.DB.Extensions.Context.Oidc</AssemblyName>
+    <PackageId>Mongo.DB.Extensions.Context.Oidc</PackageId>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Azure.Identity" />
+    <PackageReference Include="MongoDB.Driver" />
+  </ItemGroup>
+
+</Project>