Add HTTP layer and server setup

- Add strict configuration management (no fallbacks)
- Create HTTP router with Chi and CORS middleware
- Implement health check endpoint
- Add main entry point with database initialization
- Server runs on configurable host and port

cmd/api/main.go

@@ -0,0 +1,33 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"net/http"
+
+	"habit-tracker-api/internal/infrastructure/config"
+	httpInfra "habit-tracker-api/internal/infrastructure/http"
+	"habit-tracker-api/internal/infrastructure/persistence/sqlite"
+)
+
+func main() {
+	cfg, err := config.Load()
+	if err != nil {
+		log.Fatalf("Failed to load config: %v", err)
+	}
+
+	db, err := sqlite.NewDatabase(cfg.DBPath)
+	if err != nil {
+		log.Fatalf("Failed to connect to database: %v", err)
+	}
+	defer db.Close()
+
+	router := httpInfra.NewRouter(cfg.CORSOrigins)
+
+	addr := fmt.Sprintf("%s:%s", cfg.Host, cfg.Port)
+	log.Printf("Server starting on %s", addr)
+
+	if err := http.ListenAndServe(addr, router); err != nil {
+		log.Fatalf("Server failed: %v", err)
+	}
+}

go.mod

@@ -1,8 +1,15 @@
 module habit-tracker-api
 
-go 1.23.4
+go 1.24.0
+
+toolchain go1.24.10
 
 require (
+	github.com/go-chi/chi/v5 v5.2.3 // indirect
+	github.com/go-chi/cors v1.2.2 // indirect
+	github.com/golang-jwt/jwt/v5 v5.3.0 // indirect
 	github.com/google/uuid v1.6.0 // indirect
+	github.com/joho/godotenv v1.5.1 // indirect
 	github.com/mattn/go-sqlite3 v1.14.32 // indirect
+	golang.org/x/crypto v0.45.0 // indirect
 )

go.sum

@@ -1,4 +1,14 @@
+github.com/go-chi/chi/v5 v5.2.3 h1:WQIt9uxdsAbgIYgid+BpYc+liqQZGMHRaUwp0JUcvdE=
+github.com/go-chi/chi/v5 v5.2.3/go.mod h1:L2yAIGWB3H+phAw1NxKwWM+7eUH/lU8pOMm5hHcoops=
+github.com/go-chi/cors v1.2.2 h1:Jmey33TE+b+rB7fT8MUy1u0I4L+NARQlK6LhzKPSyQE=
+github.com/go-chi/cors v1.2.2/go.mod h1:sSbTewc+6wYHBBCW7ytsFSn836hqM7JxpglAy2Vzc58=
+github.com/golang-jwt/jwt/v5 v5.3.0 h1:pv4AsKCKKZuqlgs5sUmn4x8UlGa0kEVt/puTpKx9vvo=
+github.com/golang-jwt/jwt/v5 v5.3.0/go.mod h1:fxCRLWMO43lRc8nhHWY6LGqRcf+1gQWArsqaEUEa5bE=
 github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
 github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+github.com/joho/godotenv v1.5.1 h1:7eLL/+HRGLY0ldzfGMeQkb7vMd0as4CfYvUVzLqw0N0=
+github.com/joho/godotenv v1.5.1/go.mod h1:f4LDr5Voq0i2e/R5DDNOoa2zzDfwtkZa6DnEwAbqwq4=
 github.com/mattn/go-sqlite3 v1.14.32 h1:JD12Ag3oLy1zQA+BNn74xRgaBbdhbNIDYvQUEuuErjs=
 github.com/mattn/go-sqlite3 v1.14.32/go.mod h1:Uh1q+B4BYcTPb+yiD3kU8Ct7aC0hY9fxUwlHK0RXw+Y=
+golang.org/x/crypto v0.45.0 h1:jMBrvKuj23MTlT0bQEOBcAE0mjg8mK9RXFhRH6nyF3Q=
+golang.org/x/crypto v0.45.0/go.mod h1:XTGrrkGJve7CYK7J8PEww4aY7gM3qMCElcJQ8n8JdX4=

internal/infrastructure/config/config.go

@@ -0,0 +1,66 @@
+package config
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/joho/godotenv"
+)
+
+type Config struct {
+	DBType             string
+	DBPath             string
+	Port               string
+	Host               string
+	JWTSecret          string
+	JWTExpiry          string
+	RefreshTokenExpiry string
+	CORSOrigins        string
+	DefaultTimezone    string
+}
+
+func Load() (*Config, error) {
+	godotenv.Load()
+
+	cfg := &Config{
+		DBType:             os.Getenv("DB_TYPE"),
+		DBPath:             os.Getenv("DB_PATH"),
+		Port:               os.Getenv("PORT"),
+		Host:               os.Getenv("HOST"),
+		JWTSecret:          os.Getenv("JWT_SECRET"),
+		JWTExpiry:          os.Getenv("JWT_EXPIRY"),
+		RefreshTokenExpiry: os.Getenv("REFRESH_TOKEN_EXPIRY"),
+		CORSOrigins:        os.Getenv("CORS_ORIGINS"),
+		DefaultTimezone:    os.Getenv("DEFAULT_TIMEZONE"),
+	}
+
+	if cfg.DBType == "" {
+		return nil, fmt.Errorf("DB_TYPE is required")
+	}
+	if cfg.DBPath == "" {
+		return nil, fmt.Errorf("DB_PATH is required")
+	}
+	if cfg.Port == "" {
+		return nil, fmt.Errorf("PORT is required")
+	}
+	if cfg.Host == "" {
+		return nil, fmt.Errorf("HOST is required")
+	}
+	if cfg.JWTSecret == "" {
+		return nil, fmt.Errorf("JWT_SECRET is required")
+	}
+	if cfg.JWTExpiry == "" {
+		return nil, fmt.Errorf("JWT_EXPIRY is required")
+	}
+	if cfg.RefreshTokenExpiry == "" {
+		return nil, fmt.Errorf("REFRESH_TOKEN_EXPIRY is required")
+	}
+	if cfg.CORSOrigins == "" {
+		return nil, fmt.Errorf("CORS_ORIGINS is required")
+	}
+	if cfg.DefaultTimezone == "" {
+		return nil, fmt.Errorf("DEFAULT_TIMEZONE is required")
+	}
+
+	return cfg, nil
+}

internal/infrastructure/http/router.go

@@ -0,0 +1,29 @@
+package http
+
+import (
+	"net/http"
+
+	"github.com/go-chi/chi/v5"
+	"github.com/go-chi/chi/v5/middleware"
+	"github.com/go-chi/cors"
+)
+
+func NewRouter(corsOrigins string) *chi.Mux {
+	r := chi.NewRouter()
+
+	r.Use(middleware.Logger)
+	r.Use(middleware.Recoverer)
+	r.Use(cors.Handler(cors.Options{
+		AllowedOrigins:   []string{corsOrigins},
+		AllowedMethods:   []string{"GET", "POST", "PUT", "DELETE", "OPTIONS"},
+		AllowedHeaders:   []string{"Accept", "Authorization", "Content-Type"},
+		AllowCredentials: true,
+	}))
+
+	r.Get("/api/v1/health", func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusOK)
+		w.Write([]byte(`{"status":"ok"}`))
+	})
+
+	return r
+}