GM.API.Application 2.4.0

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GM.API

An opinionated ASP.NET Core Web API starter for .NET. A single AddGMAPI / UseGMAPI pair wires up controllers, CORS, API versioning, Swagger docs, FluentValidation, Serilog, and a set of middlewares (exception handling, request logging with sensitive-data masking, and request localization). Part of the GM.* family of packages. Targets net10.0.

Packages

This repository ships six packages that version and release in lockstep:

Install

dotnet add package GM.API

GM.API pulls in the companion packages; add the smaller ones directly if you only need a slice (e.g. just GM.API.Middlewares).

Use

using GM.API.Startup;

var builder = ProgramExtension.CreateGMBuilder(args);   // WebApplicationBuilder + Serilog + config

builder.Services.ConfigureGMServices(
    builder.Configuration,
    policyName: "DefaultCors",
    swaggerOptionsName: "SwaggerDocOptions");

var app = builder.Build();

app.UseGMServices();   // docs, routing, CORS, logging, localization, exception handling, controllers

app.Run();

What you get

• Thin controllers — BaseController exposes a lazily-resolved IMediator and pagination helpers. Its actions take JSON bodies; mark one [AcceptsAnyContentType] to let it take any body (e.g. a PUT whose body is a file it reads from Request.Body), while the rest of the controller stays JSON-only.

• List paging — GetBaseListModel / GetBaseListQuery page by number (CurrentPage, page 1 by default) or by last key value: LastKeyProperty (Id by default) + LastKeyValue identify the last row the client has, and the page is the rows after it in OrderBy order (GM.EntityFramework keyset paging). IncludeTotalCount=false skips the count query. In a handler:

  var paging = request.ToPagingOptions();
  long? total = paging.IncludeTotalCount ? await repo.CountAsync(countSpec, ct) : null;
  var entities = await repo.ListAsync(spec, ct);           // spec: ApplyListQuery(dateRange, paging, ordering)
  return request.ToPagedListDto(entities, entities.Adapt<List<ItemDto>>(), total);
  

  and in the controller

  AddPaginationHeader(response.TotalCount, response.PageSize, response.CurrentPage, response.TotalPages,
      response.LastKeyProperty, response.LastKeyValue, response.HasMore);
  

  writes X-Pagination with totalCount, pageSize, currentPage (0 when paged by key), totalPages, lastKeyProperty, lastKeyValue and hasMore. The last three parameters are optional, so existing four-argument calls keep working.

• Validation — FluentValidation auto-validation plus a mediator RequestValidationBehavior.

• Idempotency — a repeated POST/PUT/PATCH with the same Idempotency-Key replays the first response (GM.Idempotency). Its settings come from the Idempotency section, e.g. "Idempotency": { "LockExpiry": "00:10:00" } for requests that run long.

• Streamed uploads — mark an action [StreamedMultipartUpload("files", Multiple = true)] and read its files with MultipartFiles.ReadAsync(Request): each arrives as a MultipartFile (name, declared type, the network stream), never buffered in memory or on disk. Swagger still shows the file picker. Kestrel:Limits (e.g. MaxRequestBodySize) is bound from configuration by CreateGMBuilder, and a body Kestrel refuses while it's read is answered with its own status (413, 408, …).

• Mapping — Mapster IRegisters are picked up from your assemblies, and dates mapped to strings come out as dd/MM/yyyy HH:mm:ss (AuditableDto.DateTimeFormat), so an entity's CreatedAt/UpdatedAt land formatted in any AuditableDto with no register of your own. One of your registers can map dates differently.

• CORS, versioning, Swagger — wired from configuration in one call each. AddGMCors(policyName) allows any origin by default for backward compatibility; call AddGMCors(policyName, allowedOrigins) with an explicit origin allowlist in production.

• Middlewares — RFC-7807 exception handling (GM.Exceptions types to 400/404/429/503, with Retry-After when TooManyRequestsException or ServiceUnavailableException carries one), request/response logging with sensitive-field masking, and Accept-Language-driven request localization. Logging records textual bodies (JSON, XML, text/*, form-urlencoded) up to 64 KB; uploads and downloads are logged as their content type and size only, never read into memory, and responses stream straight through to the client.

• Serilog — host configured from appsettings.json, with environment/process/thread enrichers.

• Secrets — CreateGMBuilder layers secrets into configuration with GM.Secrets, so the app reads them like any other setting (IConfiguration, IOptions<T>):

  appsettings.json → appsettings.Local.json → appsettings.{Environment}.json
    → appsecrets.json (or SECRETS_FILE) → the store SECRETS_PROVIDER names → environment variables
  

  All four stores ship with GM.API — pick one per environment with environment variables, no code:

  SECRETS_PROVIDER	Also set
  Doppler	DOPPLER_TOKEN
  AwsSecretsManager	AWS_REGION, AWS_SECRETS_MANAGER_SECRET_IDS; credentials from the IAM role / AWS chain
  AzureKeyVault	AZURE_KEYVAULT_URI; credentials from managed identity, az login or AZURE_TENANT_ID/AZURE_CLIENT_ID/AZURE_CLIENT_SECRET
  Vault	VAULT_ADDR, VAULT_TOKEN (or AppRole), VAULT_PATHS

  Unset, only appsecrets.json is used — keep it gitignored (it's never published). The store's credentials come from environment variables only, never from configuration files; SECRETS_RELOAD_INTERVAL re-fetches the store so IOptionsMonitor<T> follows rotation. See the GM.Secrets README for every setting.

• Authorization filters — [HasPermission("name")] gates an action on the acting user holding a permission (via GM.Identity's IPermissionCache), and [RequiresScope("operation")] gates it on the calling client's granted scopes (IScopeCache) — two orthogonal dimensions, both resolved from Redis with no DB round-trip. They read the caller from the gateway-forwarded identity (ICurrentActor) and return 401 (no identity) / 403 (not granted). The contracts come from the Redis-free GM.Identity.Domain package, so GM.API does not drag a Redis dependency onto its consumers; register the Redis adapters in your app (AddGMIdentityRedisAuthorization).

Requirements

• .NET 10 SDK

Contributing & releases

Versioning is automated from Conventional Commits — see CONTRIBUTING.md. All six packages release together under one version.

License

MIT — see LICENSE.