Merge branch 'master' into toml_config

README.md

@@ -18,7 +18,7 @@ fine with getting your hands dirty, but I plan on having it ready to go for more
 - Minimal user login/registration + sessions
 - Config file handling
 - Scheduled tasks
-- Entire website compiles into a single binary (~10mb) (excluding env.json)
+- Entire website compiles into a single binary (~10mb) (excluding env.toml)
 - Minimal dependencies (just standard library, postgres driver, and experimental package for bcrypt)
 
 <hr>
@@ -39,10 +39,13 @@ fine with getting your hands dirty, but I plan on having it ready to go for more
 ## How to use 🤔
 
 1. Clone
-2. Run `go get` to install dependencies
-3. Copy env_example.json to env.json and fill in the values
-4. Run `go run main.go` to start the server
-5. Start building your app!
+2. Delete the git folder, so you can start tracking in your own repo
+3. Run `go get` to install dependencies
+4. Copy env_example.toml to env.toml and fill in the values
+5. Run `go run main.go` to start the server
+6. Rename the occurences of "GoWeb" to your app name
+7. Start building your app!
+8. When you see useful changes to GoWeb you'd like in your project copy them over
 
 ## How to contribute 👨‍💻
 

config/config.go

@@ -1,53 +1,44 @@
 package config
 
 import (
-	"encoding/json"
 	"flag"
-	"log"
+	"github.com/BurntSushi/toml"
 	"os"
 )
 
 type Configuration struct {
 	Db struct {
-		Ip          string `json:"DbIp"`
-		Port        string `json:"DbPort"`
-		Name        string `json:"DbName"`
-		User        string `json:"DbUser"`
-		Password    string `json:"DbPassword"`
-		AutoMigrate bool   `json:"DbAutoMigrate"`
+		Ip          string `toml:"DbIp"`
+		Port        string `toml:"DbPort"`
+		Name        string `toml:"DbName"`
+		User        string `toml:"DbUser"`
+		Password    string `toml:"DbPassword"`
+		AutoMigrate bool   `toml:"DbAutoMigrate"`
 	}
 
 	Listen struct {
-		Ip   string `json:"HttpIp"`
-		Port string `json:"HttpPort"`
+		Ip   string `toml:"HttpIp"`
+		Port string `toml:"HttpPort"`
 	}
 
 	Template struct {
-		BaseName string `json:"BaseTemplateName"`
+		BaseName string `toml:"BaseTemplateName"`
 	}
 }
 
 // LoadConfig loads and returns a configuration struct
 func LoadConfig() Configuration {
-	c := flag.String("c", "env.json", "Path to the json configuration file")
+	c := flag.String("c", "env.toml", "Path to the toml configuration file")
 	flag.Parse()
-	file, err := os.Open(*c)
+	file, err := os.ReadFile(*c)
 	if err != nil {
-		log.Fatal("Unable to open JSON config file: ", err)
+		panic("Unable to read TOML config file: " + err.Error())
 	}
 
-	defer func(file *os.File) {
-		err := file.Close()
-		if err != nil {
-			log.Fatal("Unable to close JSON config file: ", err)
-		}
-	}(file)
-
-	decoder := json.NewDecoder(file)
-	Config := Configuration{}
-	err = decoder.Decode(&Config)
+	var Config Configuration
+	_, err = toml.Decode(string(file), &Config)
 	if err != nil {
-		log.Fatal("Unable to decode JSON config file: ", err)
+		panic("Unable to decode TOML config file: " + err.Error())
 	}
 
 	return Config

controllers/post.go

@@ -3,7 +3,7 @@ package controllers
 import (
 	"GoWeb/app"
 	"GoWeb/models"
-	"log"
+	"log/slog"
 	"net/http"
 	"time"
 )
@@ -19,15 +19,12 @@ func (p *Post) Login(w http.ResponseWriter, r *http.Request) {
 	remember := r.FormValue("remember") == "on"
 
 	if username == "" || password == "" {
-		log.Println("Tried to login user with empty username or password")
-		http.Redirect(w, r, "/login", http.StatusFound)
+		http.Redirect(w, r, "/login", http.StatusUnauthorized)
 	}
 
 	_, err := models.AuthenticateUser(p.App, w, username, password, remember)
 	if err != nil {
-		log.Println("Error authenticating user")
-		log.Println(err)
-		http.Redirect(w, r, "/login", http.StatusFound)
+		http.Redirect(w, r, "/login", http.StatusUnauthorized)
 		return
 	}
 
@@ -41,15 +38,14 @@ func (p *Post) Register(w http.ResponseWriter, r *http.Request) {
 	updatedAt := time.Now()
 
 	if username == "" || password == "" {
-		log.Println("Tried to create user with empty username or password")
-		http.Redirect(w, r, "/register", http.StatusFound)
+		http.Redirect(w, r, "/register", http.StatusUnauthorized)
 	}
 
 	_, err := models.CreateUser(p.App, username, password, createdAt, updatedAt)
 	if err != nil {
-		log.Println("Error creating user")
-		log.Println(err)
-		return
+		// TODO: if err == bcrypt.ErrPasswordTooLong display error to user, this will require a flash message system with cookies
+		slog.Error("error creating user: " + err.Error())
+		http.Redirect(w, r, "/register", http.StatusInternalServerError)
 	}
 
 	http.Redirect(w, r, "/login", http.StatusFound)

database/connection.go

@@ -5,29 +5,26 @@ import (
 	"database/sql"
 	"fmt"
 	_ "github.com/lib/pq"
-	"log"
+	"log/slog"
 )
 
 // Connect returns a new database connection
 func Connect(app *app.App) *sql.DB {
-	// Set connection parameters from config
 	postgresConfig := fmt.Sprintf("host=%s port=%s user=%s "+
 		"password=%s dbname=%s sslmode=disable",
 		app.Config.Db.Ip, app.Config.Db.Port, app.Config.Db.User, app.Config.Db.Password, app.Config.Db.Name)
 
-	// Create connection
 	db, err := sql.Open("postgres", postgresConfig)
 	if err != nil {
 		panic(err)
 	}
 
-	// Test connection
 	err = db.Ping()
 	if err != nil {
 		panic(err)
 	}
 
-	log.Println("Connected to database successfully on " + app.Config.Db.Ip + ":" + app.Config.Db.Port + " using database " + app.Config.Db.Name)
+	slog.Info("connected to database successfully on " + app.Config.Db.Ip + ":" + app.Config.Db.Port + " using database " + app.Config.Db.Name)
 
 	return db
 }

database/migrate.go

@@ -5,7 +5,7 @@ import (
 	"errors"
 	"fmt"
 	"github.com/lib/pq"
-	"log"
+	"log/slog"
 	"reflect"
 )
 
@@ -39,23 +39,23 @@ func createTable(app *app.App, tableName string) error {
 	var tableExists bool
 	err := app.Db.QueryRow("SELECT EXISTS (SELECT 1 FROM pg_catalog.pg_class c JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace WHERE c.relname ~ $1 AND pg_catalog.pg_table_is_visible(c.oid))", "^"+tableName+"$").Scan(&tableExists)
 	if err != nil {
-		log.Println("Error checking if table exists: " + tableName)
+		slog.Error("error checking if table exists: " + tableName)
 		return err
 	}
 
 	if tableExists {
-		log.Println("Table already exists: " + tableName)
+		slog.Info("table already exists: " + tableName)
 		return nil
 	} else {
 		sanitizedTableQuery := fmt.Sprintf("CREATE TABLE IF NOT EXISTS \"%s\" (\"Id\" serial primary key)", tableName)
 
 		_, err := app.Db.Query(sanitizedTableQuery)
 		if err != nil {
-			log.Println("Error creating table: " + tableName)
+			slog.Error("error creating table: " + tableName)
 			return err
 		}
 
-		log.Println("Table created successfully: " + tableName)
+		slog.Info("table created successfully: " + tableName)
 		return nil
 	}
 }
@@ -65,17 +65,17 @@ func createColumn(app *app.App, tableName, columnName, columnType string) error
 	var columnExists bool
 	err := app.Db.QueryRow("SELECT EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = $1 AND column_name = $2)", tableName, columnName).Scan(&columnExists)
 	if err != nil {
-		log.Println("Error checking if column exists: " + columnName + " in table: " + tableName)
+		slog.Error("error checking if column exists: " + columnName + " in table: " + tableName)
 		return err
 	}
 
 	if columnExists {
-		log.Println("Column already exists: " + columnName + " in table: " + tableName)
+		slog.Info("column already exists: " + columnName + " in table: " + tableName)
 		return nil
 	} else {
 		postgresType, err := getPostgresType(columnType)
 		if err != nil {
-			log.Println("Error creating column: " + columnName + " in table: " + tableName + " with type: " + postgresType)
+			slog.Error("error creating column: " + columnName + " in table: " + tableName + " with type: " + postgresType)
 			return err
 		}
 
@@ -84,11 +84,11 @@ func createColumn(app *app.App, tableName, columnName, columnType string) error
 
 		_, err = app.Db.Query(query)
 		if err != nil {
-			log.Println("Error creating column: " + columnName + " in table: " + tableName + " with type: " + postgresType)
+			slog.Error("error creating column: " + columnName + " in table: " + tableName + " with type: " + postgresType)
 			return err
 		}
 
-		log.Println("Column created successfully:", columnName)
+		slog.Info("column created successfully:", columnName)
 
 		return nil
 	}

env_example.json

@@ -1,17 +0,0 @@
-{
-  "Db": {
-    "DbIp": "127.0.0.1",
-    "DbPort": "5432",
-    "DbName": "database",
-    "DbUser": "user",
-    "DbPassword": "password",
-    "DbAutoMigrate": true
-  },
-  "Listen": {
-    "HttpIp": "127.0.0.1",
-    "HttpPort": "8090"
-  },
-  "Template": {
-    "BaseTemplateName": "templates/base.html"
-  }
-}

env_example.toml

@@ -0,0 +1,14 @@
+[Db]
+DbIp = "127.0.0.1"
+DbPort = "5432"
+DbName = "test"
+DbUser = "postgres"
+DbPassword = "postgres"
+DbAutoMigrate = true
+
+[Listen]
+HttpIp = "127.0.0.1"
+HttpPort = "8090"
+
+[Template]
+BaseTemplateName = "templates/base.html"

go.mod

@@ -1,8 +1,10 @@
 module GoWeb
 
-go 1.20
+go 1.21
 
 require (
 	github.com/lib/pq v1.10.9
-	golang.org/x/crypto v0.11.0
+	golang.org/x/crypto v0.13.0
 )
+
+require github.com/BurntSushi/toml v1.3.2

go.sum

@@ -1,4 +1,6 @@
+github.com/BurntSushi/toml v1.3.2 h1:o7IhLm0Msx3BaB+n3Ag7L8EVlByGnpq14C4YWiu/gL8=
+github.com/BurntSushi/toml v1.3.2/go.mod h1:CxXYINrC8qIiEnFrOxCa7Jy5BFHlXnUU2pbicEuybxQ=
 github.com/lib/pq v1.10.9 h1:YXG7RB+JIjhP29X+OtkiDnYaXQwpS4JEWq7dtCCRUEw=
 github.com/lib/pq v1.10.9/go.mod h1:AlVN5x4E4T544tWzH6hKfbfQvm3HdbOxrmggDNAPY9o=
-golang.org/x/crypto v0.11.0 h1:6Ewdq3tDic1mg5xRO4milcWCfMVQhI4NkqWWvqejpuA=
-golang.org/x/crypto v0.11.0/go.mod h1:xgJhtzW8F9jGdVFWZESrid1U1bjeNy4zgy5cRr/CIio=
+golang.org/x/crypto v0.13.0 h1:mvySKfSWJ+UKUii46M40LOvyWfN0s2U+46/jDd0e6Ck=
+golang.org/x/crypto v0.13.0/go.mod h1:y6Z2r+Rw4iayiXXAIxJIDAJ1zMW4yaTpebo8fPOliYc=

main.go

@@ -9,7 +9,7 @@ import (
 	"context"
 	"embed"
 	"errors"
-	"log"
+	"log/slog"
 	"net/http"
 	"os"
 	"os/signal"
@@ -34,23 +34,26 @@ func main() {
 	if _, err := os.Stat("logs"); os.IsNotExist(err) {
 		err := os.Mkdir("logs", 0755)
 		if err != nil {
-			log.Println("Failed to create log directory")
-			log.Println(err)
-			return
+			panic("failed to create log directory: " + err.Error())
 		}
 	}
 
 	// Create log file and set output
-	file, err := os.OpenFile("logs/"+time.Now().Format("2006-01-02")+".log", os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0666)
-	log.SetOutput(file)
+	file, err := os.OpenFile("logs/"+time.Now().Format("2006-01-02")+".log", os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0644)
+	if err != nil {
+		panic("error creating log file: " + err.Error())
+	}
+
+	logger := slog.New(slog.NewTextHandler(file, nil))
+	slog.SetDefault(logger) // Set structured logger globally
 
 	// Connect to database and run migrations
 	appLoaded.Db = database.Connect(&appLoaded)
 	if appLoaded.Config.Db.AutoMigrate {
 		err = models.RunAllMigrations(&appLoaded)
 		if err != nil {
-			log.Println(err)
-			return
+			slog.Error("error running migrations: " + err.Error())
+			os.Exit(1)
 		}
 	}
 
@@ -67,10 +70,11 @@ func main() {
 	// Start server
 	server := &http.Server{Addr: appLoaded.Config.Listen.Ip + ":" + appLoaded.Config.Listen.Port}
 	go func() {
-		log.Println("Starting server and listening on " + appLoaded.Config.Listen.Ip + ":" + appLoaded.Config.Listen.Port)
+		slog.Info("starting server and listening on " + appLoaded.Config.Listen.Ip + ":" + appLoaded.Config.Listen.Port)
 		err := server.ListenAndServe()
 		if err != nil && !errors.Is(err, http.ErrServerClosed) {
-			log.Fatalf("Could not listen on %s: %v\n", appLoaded.Config.Listen.Ip+":"+appLoaded.Config.Listen.Port, err)
+			slog.Error("could not listen on %s: %v\n", appLoaded.Config.Listen.Ip+":"+appLoaded.Config.Listen.Port, err)
+			os.Exit(1)
 		}
 	}()
 
@@ -81,10 +85,11 @@ func main() {
 	go app.RunScheduledTasks(&appLoaded, 100, stop)
 
 	<-interrupt
-	log.Println("Interrupt signal received. Shutting down server...")
+	slog.Info("interrupt signal received. Shutting down server...")
 
 	err = server.Shutdown(context.Background())
 	if err != nil {
-		log.Fatalf("Could not gracefully shutdown the server: %v\n", err)
+		slog.Error("could not gracefully shutdown the server: %v\n", err)
+		os.Exit(1)
 	}
 }

middleware/csrf.go

@@ -2,7 +2,7 @@ package middleware
 
 import (
 	"GoWeb/security"
-	"log"
+	"log/slog"
 	"net/http"
 )
 
@@ -11,7 +11,7 @@ func Csrf(f func(w http.ResponseWriter, r *http.Request)) func(w http.ResponseWr
 	return func(w http.ResponseWriter, r *http.Request) {
 		_, err := security.VerifyCsrfToken(r)
 		if err != nil {
-			log.Println("Error verifying csrf token")
+			slog.Info("error verifying csrf token")
 			http.Error(w, "Forbidden", http.StatusForbidden)
 			return
 		}

models/session.go

@@ -4,7 +4,7 @@ import (
 	"GoWeb/app"
 	"crypto/rand"
 	"encoding/hex"
-	"log"
+	"log/slog"
 	"net/http"
 	"time"
 )
@@ -42,21 +42,19 @@ func CreateSession(app *app.App, w http.ResponseWriter, userId int64, remember b
 	var existingAuthToken bool
 	err := app.Db.QueryRow(selectAuthTokenIfExists, session.AuthToken).Scan(&existingAuthToken)
 	if err != nil {
-		log.Println("Error checking for existing auth token")
-		log.Println(err)
+		slog.Error("error checking for existing auth token" + err.Error())
 		return Session{}, err
 	}
 
 	// If duplicate token found, recursively call function until unique token is generated
-	if existingAuthToken == true {
-		log.Println("Duplicate token found in sessions table, generating new token...")
+	if existingAuthToken {
+		slog.Warn("duplicate token found in sessions table, generating new token...")
 		return CreateSession(app, w, userId, remember)
 	}
 
-	// Insert session into database
 	err = app.Db.QueryRow(insertSession, session.UserId, session.AuthToken, session.RememberMe, session.CreatedAt).Scan(&session.Id)
 	if err != nil {
-		log.Println("Error inserting session into database")
+		slog.Error("error inserting session into database")
 		return Session{}, err
 	}
 
@@ -69,19 +67,18 @@ func GetSessionByAuthToken(app *app.App, authToken string) (Session, error) {
 
 	err := app.Db.QueryRow(selectSessionByAuthToken, authToken).Scan(&session.Id, &session.UserId, &session.AuthToken, &session.RememberMe, &session.CreatedAt)
 	if err != nil {
-		log.Println("Error getting session by auth token")
 		return Session{}, err
 	}
 
 	return session, nil
 }
 
-// Generates a random 64-byte string
+// generateAuthToken generates a random 64-byte string
 func generateAuthToken(app *app.App) string {
 	b := make([]byte, 64)
 	_, err := rand.Read(b)
 	if err != nil {
-		log.Println("Error generating random bytes")
+		slog.Error("error generating random bytes for auth token")
 	}
 
 	return hex.EncodeToString(b)
@@ -129,7 +126,7 @@ func deleteSessionCookie(app *app.App, w http.ResponseWriter) {
 func DeleteSessionByAuthToken(app *app.App, w http.ResponseWriter, authToken string) error {
 	_, err := app.Db.Exec(deleteSessionByAuthToken, authToken)
 	if err != nil {
-		log.Println("Error deleting session from database")
+		slog.Error("error deleting session from database")
 		return err
 	}
 
@@ -143,16 +140,14 @@ func ScheduledSessionCleanup(app *app.App) {
 	// Delete sessions older than 30 days (remember me sessions)
 	_, err := app.Db.Exec(deleteSessionsOlderThan30Days)
 	if err != nil {
-		log.Println("Error deleting 30 day expired sessions from database")
-		log.Println(err)
+		slog.Error("error deleting 30 day expired sessions from database" + err.Error())
 	}
 
 	// Delete sessions older than 6 hours
 	_, err = app.Db.Exec(deleteSessionsOlderThan6Hours)
 	if err != nil {
-		log.Println("Error deleting 6 hour expired sessions from database")
-		log.Println(err)
+		slog.Error("error deleting 6 hour expired sessions from database" + err.Error())
 	}
 
-	log.Println("Deleted expired sessions from database")
+	slog.Info("deleted expired sessions from database")
 }

models/user.go

@@ -2,9 +2,8 @@ package models
 
 import (
 	"GoWeb/app"
-	"log"
+	"log/slog"
 	"net/http"
-	"strconv"
 	"time"
 
 	"golang.org/x/crypto/bcrypt"
@@ -32,13 +31,11 @@ const (
 func GetCurrentUser(app *app.App, r *http.Request) (User, error) {
 	cookie, err := r.Cookie("session")
 	if err != nil {
-		log.Println("Error getting session cookie")
 		return User{}, err
 	}
 
 	session, err := GetSessionByAuthToken(app, cookie.Value)
 	if err != nil {
-		log.Println("Error getting session by auth token")
 		return User{}, err
 	}
 
@@ -51,7 +48,6 @@ func GetUserById(app *app.App, id int64) (User, error) {
 
 	err := app.Db.QueryRow(selectUserById, id).Scan(&user.Id, &user.Username, &user.Password, &user.CreatedAt, &user.UpdatedAt)
 	if err != nil {
-		log.Println("Get user error (user not found) for user id:" + strconv.FormatInt(id, 10))
 		return User{}, err
 	}
 
@@ -64,7 +60,6 @@ func GetUserByUsername(app *app.App, username string) (User, error) {
 
 	err := app.Db.QueryRow(selectUserByUsername, username).Scan(&user.Id, &user.Username, &user.Password, &user.CreatedAt, &user.UpdatedAt)
 	if err != nil {
-		log.Println("Get user error (user not found) for user:" + username)
 		return User{}, err
 	}
 
@@ -75,7 +70,7 @@ func GetUserByUsername(app *app.App, username string) (User, error) {
 func CreateUser(app *app.App, username string, password string, createdAt time.Time, updatedAt time.Time) (User, error) {
 	hash, err := bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost)
 	if err != nil {
-		log.Println("Error hashing password when creating user")
+		slog.Error("error hashing password: " + err.Error())
 		return User{}, err
 	}
 
@@ -83,7 +78,7 @@ func CreateUser(app *app.App, username string, password string, createdAt time.T
 
 	err = app.Db.QueryRow(insertUser, username, string(hash), createdAt, updatedAt).Scan(&lastInsertId)
 	if err != nil {
-		log.Println("Error creating user row")
+		slog.Error("error creating user row: " + err.Error())
 		return User{}, err
 	}
 
@@ -96,13 +91,13 @@ func AuthenticateUser(app *app.App, w http.ResponseWriter, username string, pass
 
 	err := app.Db.QueryRow(selectUserByUsername, username).Scan(&user.Id, &user.Username, &user.Password, &user.CreatedAt, &user.UpdatedAt)
 	if err != nil {
-		log.Println("Authentication error (user not found) for user:" + username)
+		slog.Info("user not found: " + username)
 		return Session{}, err
 	}
 
 	err = bcrypt.CompareHashAndPassword([]byte(user.Password), []byte(password))
 	if err != nil { // Failed to validate password, doesn't match
-		log.Println("Authentication error (incorrect password) for user:" + username)
+		slog.Info("incorrect password:" + username)
 		return Session{}, err
 	} else {
 		return CreateSession(app, w, user.Id, remember)
@@ -113,13 +108,11 @@ func AuthenticateUser(app *app.App, w http.ResponseWriter, username string, pass
 func LogoutUser(app *app.App, w http.ResponseWriter, r *http.Request) {
 	cookie, err := r.Cookie("session")
 	if err != nil {
-		log.Println("Error getting cookie from request")
 		return
 	}
 
 	err = DeleteSessionByAuthToken(app, w, cookie.Value)
 	if err != nil {
-		log.Println("Error deleting session by AuthToken")
 		return
 	}
 }

routes/get.go

@@ -4,7 +4,7 @@ import (
 	"GoWeb/app"
 	"GoWeb/controllers"
 	"io/fs"
-	"log"
+	"log/slog"
 	"net/http"
 )
 
@@ -18,12 +18,12 @@ func Get(app *app.App) {
 	// Serve static files
 	staticFS, err := fs.Sub(app.Res, "static")
 	if err != nil {
-		log.Println(err)
+		slog.Error(err.Error())
 		return
 	}
 	staticHandler := http.FileServer(http.FS(staticFS))
 	http.Handle("/static/", http.StripPrefix("/static/", staticHandler))
-	log.Println("Serving static files from embedded file system /static")
+	slog.Info("serving static files from embedded file system /static")
 
 	// Pages
 	http.HandleFunc("/", getController.ShowHome)

security/csrf.go

@@ -3,7 +3,7 @@ package security
 import (
 	"crypto/rand"
 	"encoding/hex"
-	"log"
+	"log/slog"
 	"math"
 	"net/http"
 )
@@ -13,8 +13,7 @@ func GenerateCsrfToken(w http.ResponseWriter, _ *http.Request) (string, error) {
 	buff := make([]byte, int(math.Ceil(float64(64)/2)))
 	_, err := rand.Read(buff)
 	if err != nil {
-		log.Println("Error creating random buffer for csrf token value")
-		log.Println(err)
+		slog.Error("error creating random buffer for csrf token value" + err.Error())
 		return "", err
 	}
 	str := hex.EncodeToString(buff)
@@ -38,8 +37,7 @@ func GenerateCsrfToken(w http.ResponseWriter, _ *http.Request) (string, error) {
 func VerifyCsrfToken(r *http.Request) (bool, error) {
 	cookie, err := r.Cookie("csrf_token")
 	if err != nil {
-		log.Println("Error getting csrf_token cookie")
-		log.Println(err)
+		slog.Info("unable to get csrf_token cookie" + err.Error())
 		return false, err
 	}
 

templating/templateHelper.go

@@ -3,7 +3,7 @@ package templating
 import (
 	"GoWeb/app"
 	"html/template"
-	"log"
+	"log/slog"
 	"net/http"
 )
 
@@ -13,35 +13,35 @@ func RenderTemplate(app *app.App, w http.ResponseWriter, contentPath string, dat
 
 	templateContent, err := app.Res.ReadFile(templatePath)
 	if err != nil {
-		log.Println(err)
+		slog.Error(err.Error())
 		http.Error(w, err.Error(), 500)
 		return
 	}
 
 	t, err := template.New(templatePath).Parse(string(templateContent))
 	if err != nil {
-		log.Println(err)
+		slog.Error(err.Error())
 		http.Error(w, err.Error(), 500)
 		return
 	}
 
 	content, err := app.Res.ReadFile(contentPath)
 	if err != nil {
-		log.Println(err)
+		slog.Error(err.Error())
 		http.Error(w, err.Error(), 500)
 		return
 	}
 
 	t, err = t.Parse(string(content))
 	if err != nil {
-		log.Println(err)
+		slog.Error(err.Error())
 		http.Error(w, err.Error(), 500)
 		return
 	}
 
 	err = t.Execute(w, data)
 	if err != nil {
-		log.Println(err)
+		slog.Error(err.Error())
 		http.Error(w, err.Error(), 500)
 		return
 	}