users/cmd/gateway/main.go

package main

import (
	"flag"
	"fmt"
	"log"
	"net/http"
	"os"

	"git.chrishayward.xyz/x/users/gateway"
	"git.chrishayward.xyz/x/users/proto"
	"google.golang.org/grpc"
	"gopkg.in/yaml.v3"
)

var configPath = flag.String("config", "./config/gateway.yaml", "--config=./config/gateway.yaml")

type config struct {
	Port   int    `yaml:"port"`
	Domain string `yaml:"domain"`
	Server struct {
		Address string `yaml:"address"`
		Port    int    `yaml:"port"`
		Secret  string `yaml:"secret"`
	} `yaml:"server"`
}

func main() {
	// Parse the optional flags.
	flag.Parse()

	// Read the config file.
	config := &config{}
	file, err := os.Open(*configPath)
	if err != nil {
		log.Fatal(err)
	}
	defer file.Close()
	if err := yaml.NewDecoder(file).Decode(&config); err != nil {
		log.Fatal(err)
	}

	// Create the connection to the server.
	conn, err := grpc.Dial(
		fmt.Sprintf("%s:%d", config.Server.Address, config.Server.Port),
		grpc.WithInsecure())
	if err != nil {
		log.Fatal(err)
	}

	// Defer closing the connection.
	defer conn.Close()

	// Create the client.
	client := proto.NewUsersClient(conn)

	// Setup HTTP endpoints.
	http.HandleFunc("/register", gateway.Register(client))
	http.HandleFunc("/login", gateway.Login(client))
	http.HandleFunc("/logout", gateway.Authorize(client, config.Server.Secret, gateway.Logout(client)))
	http.HandleFunc("/reset_password", gateway.ResetPassword(client, fmt.Sprintf("%s, %d", config.Domain, config.Port)))
	http.HandleFunc("/change_password", gateway.ChangePassword(client))

	// Listen for requests.
	log.Printf("Forwarding from :%d to %s:%d", config.Port, config.Server.Address, config.Server.Port)
	if err := http.ListenAndServe(fmt.Sprintf(":%d", config.Port), nil); err != nil {
		log.Fatal(err)
	}
}