go-api

REST framework + OpenAPI SDK generation for the Lethean Go ecosystem.

Overview

go-api provides a Gin-based HTTP engine that subsystems plug into via the RouteGroup interface. Each ecosystem package (go-ml, go-rag, go-agentic, etc.) registers its own route group, and go-api handles the HTTP plumbing, middleware, response envelopes, WebSocket integration, and OpenAPI spec generation.

Quick Start

import api "forge.lthn.ai/core/go-api"

engine, _ := api.New(
    api.WithAddr(":8080"),
    api.WithBearerAuth("my-token"),
    api.WithCORS("*"),
    api.WithRequestID(),
    api.WithSwagger("My API", "Description", "0.1.0"),
)

engine.Register(myRoutes)
engine.Serve(ctx)

Implementing a RouteGroup

type Routes struct{ service *mypackage.Service }

func (r *Routes) Name() string     { return "mypackage" }
func (r *Routes) BasePath() string { return "/v1/mypackage" }

func (r *Routes) RegisterRoutes(rg *gin.RouterGroup) {
    rg.GET("/items", r.ListItems)
    rg.POST("/items", r.CreateItem)
}

func (r *Routes) ListItems(c *gin.Context) {
    items, _ := r.service.List(c.Request.Context())
    c.JSON(200, api.OK(items))
}

Authentik Integration

engine, _ := api.New(
    api.WithAuthentik(api.AuthentikConfig{
        Issuer:       "https://auth.host.uk.com/application/o/core-api/",
        ClientID:     "core-api",
        TrustedProxy: true,  // Read X-authentik-* headers from Traefik
    }),
)

In handlers, use GetUser() to access the authenticated user:

func (r *Routes) ListItems(c *gin.Context) {
    user := api.GetUser(c)  // nil if unauthenticated
    if user != nil {
        // user.Username, user.Email, user.Groups, user.UID
    }
}

For protected routes, use RequireAuth() or RequireGroup():

func (r *Routes) RegisterRoutes(rg *gin.RouterGroup) {
    rg.GET("/public", r.PublicEndpoint)
    rg.GET("/private", api.RequireAuth(), r.PrivateEndpoint)
    rg.GET("/admin", api.RequireGroup("admins"), r.AdminEndpoint)
}

Features

• Response envelope — api.OK(), api.Fail(), api.Paginated() for consistent JSON responses
• Middleware — Bearer auth, CORS, request ID generation, panic recovery
• Authentik — Forward auth headers + OIDC JWT validation, RequireAuth() and RequireGroup() guards
• WebSocket — WithWSHandler() mounts any http.Handler at /ws
• Swagger UI — WithSwagger() serves interactive API docs at /swagger/
• Health check — Built-in GET /health endpoint

Licence

EUPL-1.2