chore: clean up server entrypoints and add user CLI tool

cmd/user/main.go

@@ -0,0 +1,73 @@
+package main
+
+import (
+	"bufio"
+	"database/sql"
+	"fmt"
+	"log"
+	"os"
+	"strings"
+
+	"github.com/google/uuid"
+	"golang.org/x/crypto/bcrypt"
+	"mal/internal/db/sqlite"
+)
+
+func main() {
+	if len(os.Args) != 3 {
+		log.Fatalf("Usage: go run cmd/user/main.go <username> <password>")
+	}
+
+	username := os.Args[1]
+	password := os.Args[2]
+
+	db, err := sqlite.Open(sqlite.GetDBFile())
+	if err != nil {
+		log.Fatalf("failed to open db: %v", err)
+	}
+	defer db.Close()
+
+	var existingID string
+	err = db.QueryRow("SELECT id FROM user WHERE username = ?", username).Scan(&existingID)
+	if err != nil && err != sql.ErrNoRows {
+		log.Fatalf("database error: %v", err)
+	}
+
+	if err == nil {
+		fmt.Printf("User '%s' already exists. Do you want to overwrite their password? [y/N]: ", username)
+		reader := bufio.NewReader(os.Stdin)
+		response, _ := reader.ReadString('\n')
+		response = strings.TrimSpace(strings.ToLower(response))
+
+		if response != "y" && response != "yes" {
+			fmt.Println("Operation cancelled.")
+			return
+		}
+
+		hash, err := bcrypt.GenerateFromPassword([]byte(password), 12)
+		if err != nil {
+			log.Fatalf("failed to hash password: %v", err)
+		}
+
+		_, err = db.Exec("UPDATE user SET password_hash = ? WHERE id = ?", string(hash), existingID)
+		if err != nil {
+			log.Fatalf("failed to update user: %v", err)
+		}
+
+		fmt.Printf("Password for '%s' updated successfully!\n", username)
+		return
+	}
+
+	hash, err := bcrypt.GenerateFromPassword([]byte(password), 12)
+	if err != nil {
+		log.Fatalf("failed to hash password: %v", err)
+	}
+
+	id := uuid.New().String()
+	_, err = db.Exec("INSERT INTO user (id, username, password_hash) VALUES (?, ?, ?)", id, username, string(hash))
+	if err != nil {
+		log.Fatalf("failed to create user: %v", err)
+	}
+
+	fmt.Printf("User '%s' was created successfully!\n", username)
+}