feat: implement ofac file service

src/SanctionsSearch.Worker/Services/OfacFileService.cs

@@ -1,3 +1,6 @@
+
+using FluentResults;
+
 namespace SanctionsSearch.Worker.Services;
 
 class OfacFileService(
@@ -9,4 +12,37 @@ class OfacFileService(
   private readonly HttpClient _client = client ?? throw new ArgumentNullException(nameof(client));
   private readonly ILogger<OfacFileService> _logger = logger ?? throw new ArgumentNullException(nameof(logger));
   private readonly OfacFileServiceOptions _options = options?.Value ?? throw new ArgumentNullException(nameof(options));
+  private async Task<Result<Stream>> GetFileAsync(Uri fileUri)
+  {
+    try
+    {
+      _logger.LogInformation("Downloading file from {FileUri}", fileUri);
+
+      var response = await _client.GetAsync(fileUri);
+
+      if (response.IsSuccessStatusCode is false)
+      {
+        _logger.LogError("Failed to download file from {FileUri}", fileUri);
+        return Result.Fail($"Failed to download file from {fileUri}");
+      }
+
+      _logger.LogInformation("Downloaded file from {FileUri}", fileUri);
+      var stream = await response.Content.ReadAsStreamAsync();
+      return Result.Ok(stream);
+    }
+    catch (Exception ex)
+    {
+      _logger.LogError(ex, "Failed to download file from {FileUri}", fileUri);
+      return Result.Fail($"Failed to download file from {fileUri}");
+    }
+  }
+
+  public Task<Result<Stream>> GetSdnFileAsync() => GetFileAsync(_options.GetSdnFileUri());
+  public Task<Result<Stream>> GetAddressFileAsync() => GetFileAsync(_options.GetAddressFileUri());
+  public Task<Result<Stream>> GetAltNamesFileAsync() => GetFileAsync(_options.GetAltNamesFileUri());
+  public Task<Result<Stream>> GetCommentsFileAsync() => GetFileAsync(_options.GetCommentsFileUri());
+  public Task<Result<Stream>> GetConPrimaryNameFileAsync() => GetFileAsync(_options.GetConPrimaryNameFileUri());
+  public Task<Result<Stream>> GetConAddressesFileAsync() => GetFileAsync(_options.GetConAddressesFileUri());
+  public Task<Result<Stream>> GetConAltNamesFileAsync() => GetFileAsync(_options.GetConAltNamesFileUri());
+  public Task<Result<Stream>> GetConCommentsFileAsync() => GetFileAsync(_options.GetConCommentsFileUri());
 }