Add flagsmith

src/Managing.Application/Managing.Application.csproj

@@ -14,6 +14,7 @@
 
     <ItemGroup>
         <PackageReference Include="FluentValidation" Version="11.9.1"/>
+        <PackageReference Include="Flagsmith" Version="5.0.0"/>
         <PackageReference Include="GeneticSharp" Version="3.1.4"/>
         <PackageReference Include="MediatR" Version="12.2.0"/>
         <PackageReference Include="MediatR.Extensions.Microsoft.DependencyInjection" Version="11.1.0"/>

src/Managing.Application/Shared/FlagsmithService.cs

@@ -0,0 +1,122 @@
+using Flagsmith;
+using Managing.Application.Abstractions.Services;
+using Microsoft.Extensions.Logging;
+
+namespace Managing.Application.Shared;
+
+/// <summary>
+/// Configuration settings for Flagsmith
+/// </summary>
+public class FlagsmithSettings
+{
+    public string ApiKey { get; set; } = string.Empty;
+    /// <summary>
+    /// API URL for self-hosted Flagsmith instance (required).
+    /// </summary>
+    public string ApiUrl { get; set; } = string.Empty;
+}
+
+/// <summary>
+/// Service for managing feature flags using Flagsmith
+/// </summary>
+public class FlagsmithService : IFlagsmithService
+{
+    private readonly FlagsmithClient _flagsmithClient;
+    private readonly ILogger<FlagsmithService> _logger;
+
+    public FlagsmithService(FlagsmithClient flagsmithClient, ILogger<FlagsmithService> logger)
+    {
+        _flagsmithClient = flagsmithClient ?? throw new ArgumentNullException(nameof(flagsmithClient));
+        _logger = logger ?? throw new ArgumentNullException(nameof(logger));
+    }
+
+    public async Task<IFlagsmithFlags> GetIdentityFlagsAsync(string identity)
+    {
+        if (string.IsNullOrWhiteSpace(identity))
+        {
+            throw new ArgumentException("Identity cannot be null or empty", nameof(identity));
+        }
+
+        try
+        {
+            var flags = await _flagsmithClient.GetIdentityFlags(identity);
+            return new FlagsmithFlagsWrapper(flags);
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Error getting flags for identity {Identity}", identity);
+            throw;
+        }
+    }
+
+    public async Task<bool> IsFeatureEnabledAsync(string identity, string featureName)
+    {
+        if (string.IsNullOrWhiteSpace(identity))
+        {
+            throw new ArgumentException("Identity cannot be null or empty", nameof(identity));
+        }
+
+        if (string.IsNullOrWhiteSpace(featureName))
+        {
+            throw new ArgumentException("Feature name cannot be null or empty", nameof(featureName));
+        }
+
+        try
+        {
+            var flags = await GetIdentityFlagsAsync(identity);
+            return await flags.IsFeatureEnabled(featureName);
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Error checking feature {FeatureName} for identity {Identity}", featureName, identity);
+            return false; // Default to false on error
+        }
+    }
+
+    public async Task<string?> GetFeatureValueAsync(string identity, string featureName)
+    {
+        if (string.IsNullOrWhiteSpace(identity))
+        {
+            throw new ArgumentException("Identity cannot be null or empty", nameof(identity));
+        }
+
+        if (string.IsNullOrWhiteSpace(featureName))
+        {
+            throw new ArgumentException("Feature name cannot be null or empty", nameof(featureName));
+        }
+
+        try
+        {
+            var flags = await GetIdentityFlagsAsync(identity);
+            return await flags.GetFeatureValue(featureName);
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Error getting feature value {FeatureName} for identity {Identity}", featureName, identity);
+            return null; // Default to null on error
+        }
+    }
+}
+
+/// <summary>
+/// Wrapper for Flagsmith flags to implement IFlagsmithFlags interface
+/// </summary>
+internal class FlagsmithFlagsWrapper : IFlagsmithFlags
+{
+    private readonly IFlags _flags;
+
+    public FlagsmithFlagsWrapper(IFlags flags)
+    {
+        _flags = flags ?? throw new ArgumentNullException(nameof(flags));
+    }
+
+    public Task<bool> IsFeatureEnabled(string featureName)
+    {
+        return _flags.IsFeatureEnabled(featureName);
+    }
+
+    public Task<string?> GetFeatureValue(string featureName)
+    {
+        return _flags.GetFeatureValue(featureName);
+    }
+}