242 lines
8.2 KiB
PHP
242 lines
8.2 KiB
PHP
<?php
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function _new_user(array $row): User
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{
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return new User($row);
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}
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/**
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* Class User
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*
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* An object representing a row in the "users" table.
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*
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* The currently logged in user will always be accessible via the global variable $user.
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*/
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class User
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{
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/** @var int */
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public $id;
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/** @var string */
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public $name;
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/** @var string */
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public $email;
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public $join_date;
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/** @var string */
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public $passhash;
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/** @var UserClass */
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public $class;
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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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* Initialisation *
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* *
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* User objects shouldn't be created directly, they should be *
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* fetched from the database like so: *
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* *
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* $user = User::by_name("bob"); *
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* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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/**
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* One will very rarely construct a user directly, more common
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* would be to use User::by_id, User::by_session, etc.
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*
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* @throws SCoreException
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*/
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public function __construct(array $row)
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{
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global $_shm_user_classes;
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$this->id = int_escape($row['id']);
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$this->name = $row['name'];
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$this->email = $row['email'];
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$this->join_date = $row['joindate'];
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$this->passhash = $row['pass'];
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if (array_key_exists($row["class"], $_shm_user_classes)) {
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$this->class = $_shm_user_classes[$row["class"]];
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} else {
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throw new SCoreException("User '{$this->name}' has invalid class '{$row["class"]}'");
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}
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}
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public static function by_session(string $name, string $session): ?User
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{
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global $config, $database;
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$row = $database->cache->get("user-session:$name-$session");
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if (!$row) {
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if ($database->get_driver_name() === Database::MYSQL_DRIVER) {
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$query = "SELECT * FROM users WHERE name = :name AND md5(concat(pass, :ip)) = :sess";
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} else {
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$query = "SELECT * FROM users WHERE name = :name AND md5(pass || :ip) = :sess";
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}
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$row = $database->get_row($query, ["name"=>$name, "ip"=>get_session_ip($config), "sess"=>$session]);
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$database->cache->set("user-session:$name-$session", $row, 600);
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}
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return is_null($row) ? null : new User($row);
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}
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public static function by_id(int $id): ?User
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{
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global $database;
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if ($id === 1) {
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$cached = $database->cache->get('user-id:'.$id);
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if ($cached) {
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return new User($cached);
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}
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}
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$row = $database->get_row("SELECT * FROM users WHERE id = :id", ["id"=>$id]);
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if ($id === 1) {
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$database->cache->set('user-id:'.$id, $row, 600);
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}
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return is_null($row) ? null : new User($row);
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}
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public static function by_name(string $name): ?User
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{
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global $database;
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$row = $database->get_row($database->scoreql_to_sql("SELECT * FROM users WHERE SCORE_STRNORM(name) = SCORE_STRNORM(:name)"), ["name"=>$name]);
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return is_null($row) ? null : new User($row);
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}
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public static function by_name_and_pass(string $name, string $pass): ?User
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{
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$user = User::by_name($name);
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if ($user) {
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if ($user->passhash == md5(strtolower($name) . $pass)) {
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log_info("core-user", "Migrating from md5 to bcrypt for ".html_escape($name));
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$user->set_password($pass);
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}
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if (password_verify($pass, $user->passhash)) {
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log_info("core-user", "Logged in as ".html_escape($name)." ({$user->class->name})");
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return $user;
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} else {
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log_warning("core-user", "Failed to log in as ".html_escape($name)." (Invalid password)");
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}
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} else {
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log_warning("core-user", "Failed to log in as ".html_escape($name)." (Invalid username)");
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}
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return null;
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}
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/* useful user object functions start here */
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public function can(string $ability): bool
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{
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return $this->class->can($ability);
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}
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public function is_anonymous(): bool
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{
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global $config;
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return ($this->id === $config->get_int('anon_id'));
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}
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public function is_logged_in(): bool
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{
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global $config;
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return ($this->id !== $config->get_int('anon_id'));
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}
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public function is_admin(): bool
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{
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return ($this->class->name === "admin");
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}
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public function set_class(string $class): void
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{
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global $database;
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$database->Execute("UPDATE users SET class=:class WHERE id=:id", ["class"=>$class, "id"=>$this->id]);
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log_info("core-user", 'Set class for '.$this->name.' to '.$class);
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}
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public function set_name(string $name): void
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{
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global $database;
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if (User::by_name($name)) {
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throw new Exception("Desired username is already in use");
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}
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$old_name = $this->name;
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$this->name = $name;
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$database->Execute("UPDATE users SET name=:name WHERE id=:id", ["name"=>$this->name, "id"=>$this->id]);
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log_info("core-user", "Changed username for {$old_name} to {$this->name}");
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}
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public function set_password(string $password): void
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{
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global $database;
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$hash = password_hash($password, PASSWORD_BCRYPT);
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if (is_string($hash)) {
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$this->passhash = $hash;
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$database->Execute("UPDATE users SET pass=:hash WHERE id=:id", ["hash"=>$this->passhash, "id"=>$this->id]);
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log_info("core-user", 'Set password for '.$this->name);
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} else {
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throw new SCoreException("Failed to hash password");
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}
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}
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public function set_email(string $address): void
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{
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global $database;
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$database->Execute("UPDATE users SET email=:email WHERE id=:id", ["email"=>$address, "id"=>$this->id]);
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log_info("core-user", 'Set email for '.$this->name);
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}
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/**
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* Get a snippet of HTML which will render the user's avatar, be that
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* a local file, a remote file, a gravatar, a something else, etc.
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*/
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public function get_avatar_html(): string
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{
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// FIXME: configurable
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global $config;
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if ($config->get_string("avatar_host") === "gravatar") {
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if (!empty($this->email)) {
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$hash = md5(strtolower($this->email));
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$s = $config->get_string("avatar_gravatar_size");
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$d = urlencode($config->get_string("avatar_gravatar_default"));
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$r = $config->get_string("avatar_gravatar_rating");
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$cb = date("Y-m-d");
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return "<img class=\"avatar gravatar\" src=\"https://www.gravatar.com/avatar/$hash.jpg?s=$s&d=$d&r=$r&cacheBreak=$cb\">";
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}
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}
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return "";
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}
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/**
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* Get an auth token to be used in POST forms
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*
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* password = secret, avoid storing directly
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* passhash = bcrypt(password), so someone who gets to the database can't get passwords
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* sesskey = md5(passhash . IP), so if it gets sniffed it can't be used from another IP,
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* and it can't be used to get the passhash to generate new sesskeys
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* authtok = md5(sesskey, salt), presented to the user in web forms, to make sure that
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* the form was generated within the session. Salted and re-hashed so that
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* reading a web page from the user's cache doesn't give access to the session key
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*/
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public function get_auth_token(): string
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{
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global $config;
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$salt = DATABASE_DSN;
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$addr = get_session_ip($config);
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return md5(md5($this->passhash . $addr) . "salty-csrf-" . $salt);
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}
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public function get_auth_html(): string
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{
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$at = $this->get_auth_token();
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return '<input type="hidden" name="auth_token" value="'.$at.'">';
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}
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public function check_auth_token(): bool
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{
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return (isset($_POST["auth_token"]) && $_POST["auth_token"] == $this->get_auth_token());
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}
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}
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