131 lines
3.8 KiB
Go
131 lines
3.8 KiB
Go
package models
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import (
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"GoWeb/internal"
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"crypto/sha256"
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"encoding/hex"
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"log/slog"
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"net/http"
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"time"
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"golang.org/x/crypto/bcrypt"
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)
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type User struct {
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Id int64
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Username string
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Password string
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CreatedAt time.Time
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UpdatedAt time.Time
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}
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const userColumnsNoId = "\"Username\", \"Password\", \"CreatedAt\", \"UpdatedAt\""
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const userColumns = "\"Id\", " + userColumnsNoId
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const userTable = "public.\"User\""
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const (
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selectUserById = "SELECT " + userColumns + " FROM " + userTable + " WHERE \"Id\" = $1"
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selectUserByUsername = "SELECT " + userColumns + " FROM " + userTable + " WHERE \"Username\" = $1"
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insertUser = "INSERT INTO " + userTable + " (" + userColumnsNoId + ") VALUES ($1, $2, $3, $4) RETURNING \"Id\""
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)
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// CurrentUser finds the currently logged-in user by session cookie
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func CurrentUser(app *app.Deps, r *http.Request) (User, error) {
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cookie, err := r.Cookie("session")
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if err != nil {
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return User{}, err
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}
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session, err := SessionByAuthToken(app, cookie.Value)
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if err != nil {
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return User{}, err
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}
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return UserById(app, session.UserId)
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}
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// UserById finds a User table row in the database by id and returns a struct representing this row
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func UserById(app *app.Deps, id int64) (User, error) {
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user := User{}
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err := app.Db.QueryRow(selectUserById, id).Scan(&user.Id, &user.Username, &user.Password, &user.CreatedAt, &user.UpdatedAt)
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if err != nil {
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return User{}, err
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}
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return user, nil
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}
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// UserByUsername finds a User table row in the database by username and returns a struct representing this row
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func UserByUsername(app *app.Deps, username string) (User, error) {
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user := User{}
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err := app.Db.QueryRow(selectUserByUsername, username).Scan(&user.Id, &user.Username, &user.Password, &user.CreatedAt, &user.UpdatedAt)
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if err != nil {
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return User{}, err
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}
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return user, nil
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}
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// CreateUser creates a User table row in the database
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func CreateUser(app *app.Deps, username string, password string, createdAt time.Time, updatedAt time.Time) (User, error) {
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// Get sha256 hash of password then get bcrypt hash to store
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hash256 := sha256.New()
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hash256.Write([]byte(password))
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hashSum := hash256.Sum(nil)
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hashString := hex.EncodeToString(hashSum)
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hash, err := bcrypt.GenerateFromPassword([]byte(hashString), bcrypt.DefaultCost)
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if err != nil {
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slog.Error("error hashing password: " + err.Error())
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return User{}, err
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}
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var lastInsertId int64
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err = app.Db.QueryRow(insertUser, username, string(hash), createdAt, updatedAt).Scan(&lastInsertId)
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if err != nil {
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slog.Error("error creating user row: " + err.Error())
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return User{}, err
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}
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return UserById(app, lastInsertId)
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}
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// AuthenticateUser validates the password for the specified user
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func AuthenticateUser(app *app.Deps, w http.ResponseWriter, username string, password string, remember bool) (Session, error) {
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var user User
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err := app.Db.QueryRow(selectUserByUsername, username).Scan(&user.Id, &user.Username, &user.Password, &user.CreatedAt, &user.UpdatedAt)
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if err != nil {
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slog.Info("user not found: " + username)
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return Session{}, err
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}
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// Get sha256 hash of password then check bcrypt
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hash256 := sha256.New()
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hash256.Write([]byte(password))
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hashSum := hash256.Sum(nil)
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hashString := hex.EncodeToString(hashSum)
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err = bcrypt.CompareHashAndPassword([]byte(user.Password), []byte(hashString))
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if err != nil { // Failed to validate password, doesn't match
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slog.Info("incorrect password:" + username)
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return Session{}, err
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} else {
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return CreateSession(app, w, user.Id, remember)
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}
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}
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// LogoutUser deletes the session cookie and AuthToken from the database
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func LogoutUser(app *app.Deps, w http.ResponseWriter, r *http.Request) {
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cookie, err := r.Cookie("session")
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if err != nil {
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return
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}
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err = DeleteSessionByAuthToken(app, w, cookie.Value)
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if err != nil {
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return
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}
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}
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