Added config for env & .env for the database connection

config/config.go

@@ -0,0 +1,45 @@
+package config
+
+import (
+	"fmt"
+	"os"
+	"strings"
+
+	"github.com/joho/godotenv"
+)
+
+func Load() map[string]string {
+	var env map[string]string = make(map[string]string)
+
+	validEnv := []string{"DB_USER", "DB_PASSWORD", "DB_NAME", "DB_HOST", "DB_PORT"}
+
+	envpath := "./.env"
+
+	if _, err := os.Stat(envpath); err == nil {
+
+		dotenv, err := godotenv.Read(envpath)
+		if err != nil {
+			fmt.Println("Error loading .env file: ", err)
+		}
+
+		env = dotenv
+	} else {
+		fmt.Println("No .env file found", err)
+	}
+
+	for _, key := range validEnv {
+		tempenv := os.Getenv(key)
+		if tempenv != "" {
+			env[key] = tempenv
+		}
+	}
+
+	if len(env) == 0 {
+		fmt.Println("no environment variables are set")
+		os.Exit(1)
+	}
+	
+	// TODO: check if all the required environment variables are set
+	return env
+}
+

go.mod

@@ -1,3 +1,5 @@
 module github.com/LeRoid-hub/Bookholder-API
 
 go 1.22.1
+
+require github.com/joho/godotenv v1.5.1 // indirect

go.sum

@@ -0,0 +1,2 @@
+github.com/joho/godotenv v1.5.1 h1:7eLL/+HRGLY0ldzfGMeQkb7vMd0as4CfYvUVzLqw0N0=
+github.com/joho/godotenv v1.5.1/go.mod h1:f4LDr5Voq0i2e/R5DDNOoa2zzDfwtkZa6DnEwAbqwq4=