GoWeb/models/user.go
2023-04-07 21:27:14 -05:00

133 lines
4.0 KiB
Go

package models
import (
"GoWeb/app"
"log"
"net/http"
"strconv"
"time"
"golang.org/x/crypto/bcrypt"
)
type User struct {
Id int64
Username string
Password string
CreatedAt time.Time
UpdatedAt time.Time
}
const userColumnsNoId = "\"Username\", \"Password\", \"CreatedAt\", \"UpdatedAt\""
const userColumns = "\"Id\", " + userColumnsNoId
const userTable = "public.\"User\""
const (
selectUserById = "SELECT " + userColumns + " FROM " + userTable + " WHERE \"Id\" = $1"
selectUserByUsername = "SELECT " + userColumns + " FROM " + userTable + " WHERE \"Username\" = $1"
insertUser = "INSERT INTO " + userTable + " (" + userColumnsNoId + ") VALUES ($1, $2, $3, $4) RETURNING \"Id\""
)
// GetCurrentUser finds the currently logged-in user by session cookie
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
}
return GetUserById(app, session.UserId)
}
// GetUserById finds a User table row in the database by id and returns a struct representing this row
func GetUserById(app *app.App, id int64) (User, error) {
user := User{}
// Query row by id
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
}
return user, nil
}
// GetUserByUsername finds a User table row in the database by username and returns a struct representing this row
func GetUserByUsername(app *app.App, username string) (User, error) {
user := User{}
// Query row by username
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
}
return user, nil
}
// CreateUser creates a User table row in the database
func CreateUser(app *app.App, username string, password string, createdAt time.Time, updatedAt time.Time) (User, error) {
// Hash password
hash, err := bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost)
if err != nil {
log.Println("Error hashing password when creating user")
return User{}, err
}
var lastInsertId int64
err = app.Db.QueryRow(insertUser, username, string(hash), createdAt, updatedAt).Scan(&lastInsertId)
if err != nil {
log.Println("Error creating user row")
return User{}, err
}
return GetUserById(app, lastInsertId)
}
// AuthenticateUser validates the password for the specified user
func AuthenticateUser(app *app.App, w http.ResponseWriter, username string, password string, remember bool) (Session, error) {
var user User
// Query row by username
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)
return Session{}, err
}
// Validate password
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)
return Session{}, err
} else {
return CreateSession(app, w, user.Id, remember)
}
}
// LogoutUser deletes the session cookie and AuthToken from the database
func LogoutUser(app *app.App, w http.ResponseWriter, r *http.Request) {
// Get cookie from request
cookie, err := r.Cookie("session")
if err != nil {
log.Println("Error getting cookie from request")
return
}
// Set token to empty string
err = DeleteSessionByAuthToken(app, w, cookie.Value)
if err != nil {
log.Println("Error deleting session by AuthToken")
return
}
}