pomme/internal/api/helpers.go

package api

import (
	"context"
	"fmt"
	"net/http"
	"time"

	"dns.froth.zone/pomme/internal"
	"dns.froth.zone/pomme/internal/db"
	"github.com/go-chi/httplog"
	"github.com/go-chi/render"
	"gorm.io/gorm"
)

// setDBMiddleware is the http Handler func for the GORM middleware with context.
func setDBMiddleware(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		var (
			pommeDB *gorm.DB
			ok      bool
		)
		c, err := internal.ReadConfig()
		if err != nil {
			logHandler(genericResponseFields{"error": err.Error(), "message": "No config file defined:"})
		}

		switch r.Header.Get("User-Agent") {
		case "pomme-api-test-slave":
			pommeDB, err, ok = db.InitDb(c.TestDB)
		default:
			pommeDB, err, ok = db.InitDb(c.DB)
		}

		if err != nil && !ok {
			logHandler(genericResponseFields{"error": err.Error(), "message": "Error initializing DB"})
			err = internal.SysKill()
			if err != nil {
				panic("idk what to do with this but syscall.Kill errored out.")
			}
		}

		timeoutContext, cancelContext := context.WithTimeout(context.Background(), time.Second)
		ctx := context.WithValue(r.Context(), keyPrincipalContextID, pommeDB.WithContext(timeoutContext))
		defer cancelContext()
		next.ServeHTTP(w, r.WithContext(ctx))
	})
}

func APIError[T ~map[string]any](w http.ResponseWriter, r *http.Request, v T) {
	w.Header().Set("X-Content-Type-Options", "nosniff")
	w.Header().Set("Content-Type", "application/json; charset=utf-8")

	logHandler(v)

	switch v["realm"] {
	default:
		w.Header().Add("WWW-Authenticate", fmt.Sprintf(`realm="%s"`, v["realm"].(string)))

		fallthrough
	case nil:
		w.Header().Add("API Error", v["message"].(string))
	}

	w.WriteHeader(v["status"].(int))

	// remove unnecessary items from response
	delete(v, "error")
	delete(v, "status")

	render.JSON(w, r, v)
}

func logHandler(v map[string]any) {
	logger := httplog.NewLogger("Pomme", httplog.Options{
		JSON: true,
	})

	switch v["error"] {
	default:
		logger.Error().Msg(v["error"].(string))

		fallthrough
	case nil:
		logger.Info().Msg(v["message"].(string))
	}
}