Refactor router and storage

* Split and extract data-logic from application level
* Move storage to DeeSee package
* Move router into internal package
* Fix Makefile
* Fix documentation
* Fix tests

cmd/hub/main.go

@@ -0,0 +1,87 @@
+package main
+
+import (
+	"fmt"
+	"github.com/eslider/superherohub/internal/router"
+	"github.com/eslider/superherohub/pkg/deesee/storage"
+	"github.com/eslider/superherohub/pkg/file"
+	"log"
+	"net/http"
+	"os"
+	"strconv"
+	"time"
+)
+
+// main is the entry point of the application
+func main() {
+	var (
+		dataPath = "data/heros.json" // store to JSON file
+		port     = 8080              // Port to serve
+		key      = 5                 // DeeSee encryption key
+		err      error
+	)
+
+	// Create logger
+	logger := log.Default()
+
+	// Get port from environment variable
+	if os.Getenv("PORT") != "" {
+		port, err = strconv.Atoi(os.Getenv("PORT"))
+		if err != nil {
+			logger.Fatalf("Invalid port number: %s", err.Error())
+		}
+		if port < 1 || port > 65535 {
+			logger.Print("Port number must be between 1 and 65535")
+			logger.Fatalf("Invalid port number : %d", port)
+		}
+	}
+
+	// Get key from environment variable
+	if os.Getenv("KEY") != "" {
+		key, err = strconv.Atoi(os.Getenv("KEY"))
+		if err != nil {
+			logger.Fatalf("Invalid key: %s", err.Error())
+		}
+		//if key < 1 || key > 25 {
+		//	logger.Print("Key number should be between 1 and 25")
+		//	logger.Fatalf("Invalid key number : %d", key)
+		//}
+	}
+	//else {
+	//	logger.Fatalf("Key is not set. Please set KEY environment variable.")
+	//}
+
+	// Get data path from environment variable
+	if os.Getenv("DATA_PATH") != "" {
+		dataPath = os.Getenv("DATA_PATH")
+	}
+
+	// Check if data path exists
+	if !file.IsExist(dataPath) {
+		logger.Fatalf("Invalid data path: %s", dataPath)
+	}
+
+	s, err := storage.New(dataPath)
+
+	//heros, err := deesee.Load(dataPath)
+	if err != nil {
+		logger.Fatalf("Invalid data format: %s", dataPath)
+	}
+
+	// Create a new server
+	srv := &http.Server{
+		Addr:         fmt.Sprintf(":%d", port), // Define port and address to serve
+		Handler:      router.New(s, key, logger).GetHandler(),
+		ErrorLog:     logger,
+		ReadTimeout:  240 * time.Second, // Good practice: enforcing timeouts for serving.
+		WriteTimeout: 240 * time.Second, // Good practice: enforcing timeouts for serving.
+	}
+
+	// Log info
+	logger.Printf("Serving on port %d", port)
+
+	// Serve and handle error
+	if err := srv.ListenAndServe(); err != nil {
+		logger.Fatal(err)
+	}
+}