add auth repository && add initpostgresql

internal/db/postgresql/postgresql.go

@@ -0,0 +1,46 @@
+package dsn
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/joho/godotenv"
+)
+
+type PostgresConfig struct {
+	DBHost     string
+	DBPort     string
+	DBUser     string
+	DBName     string
+	DBPassword string
+	DBSSLMode  string
+}
+
+func InitPostgresConfigFromEnv() (PostgresConfig, error) {
+	var cfg = PostgresConfig{}
+	if err := godotenv.Load(); err != nil {
+		return cfg, err
+	}
+
+	host, existHost := os.LookupEnv("DB_HOST")
+	port, existPort := os.LookupEnv("DB_PORT")
+	user, existUser := os.LookupEnv("DB_USER")
+	pass, existPass := os.LookupEnv("DB_PASS")
+	dbname, existName := os.LookupEnv("DB_NAME")
+	dbsslmode, existSSL := os.LookupEnv("DB_SSLMODE")
+
+	if !existHost || !existPort || !existUser || !existPass || !existName || existSSL {
+		return cfg, fmt.Errorf("existHost or existPort or existUser or existPass or existName is Empty")
+	}
+	cfg = PostgresConfig{
+		DBHost:     host,
+		DBPort:     port,
+		DBUser:     user,
+		DBName:     dbname,
+		DBPassword: pass,
+		DBSSLMode:  dbsslmode,
+	}
+	return cfg, nil
+}
+
+// TO DO InitPostgresDB()