477 lines
19 KiB
PHP
477 lines
19 KiB
PHP
<?php
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namespace php;
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use DateTime;
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use PDO;
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/**
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* Manages interaction with the database in the context of users.
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*/
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// TODO: Remove duplication in this class
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class UserManager
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{
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/**
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* The maximum length of an email address.
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*/
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private const MAX_EMAIL_LENGTH = 254;
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/**
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* The minimum length of a password;
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*/
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private const MIN_PASSWORD_LENGTH = 8;
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/**
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* The maximum length of a password.
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*/
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private const MAX_PASSWORD_LENGTH = 64;
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/**
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* The minimum number of minutes between two verification emails.
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*/
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private const MINUTES_BETWEEN_VERIFICATION_EMAILS = 5;
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/**
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* @var PDO The database connection to interact with.
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*/
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private PDO $conn;
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/**
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* Constructs a new user manager.
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*
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* @param PDO $conn the database connection to interact with
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*/
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public function __construct(PDO $conn)
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{
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$this->conn = $conn;
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}
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/**
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* Populates the database with the necessary structures for users.
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*
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* @return void
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*/
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public function install(): void
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{
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$this->conn->exec("CREATE TABLE users(uuid text not null unique primary key default(lower(hex(randomblob(16)))),
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email text not null unique,
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email_verification_token text,
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email_verification_token_timestamp int not null,
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password text not null,
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password_update_time int not null);");
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}
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/**
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* Registers a new user.
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*
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* @param Mailer $mailer the mailer to notify the user with
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* @param string $email the user-submitted email address
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* @param string $password the user-submitted password
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* @param string $password_confirm the user-submitted password confirmation
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* @return Response a response with message `null` if the user was registered, or a response with a message
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* explaining what went wrong otherwise
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*/
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public function register(Mailer $mailer, string $email, string $password, string $password_confirm): Response
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{
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// Validate
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if (!filter_var($email, FILTER_VALIDATE_EMAIL) || strlen($email) > self::MAX_EMAIL_LENGTH)
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return new Response(
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payload: ["target" => "email", "message" => "Invalid email address."],
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satisfied: false
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);
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if (strlen($password) < self::MIN_PASSWORD_LENGTH || strlen($password) > self::MAX_PASSWORD_LENGTH)
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return new Response(
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payload: [
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"target" => "password",
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"message" => "Your password should be at least 8 and at most 64 characters long."
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],
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satisfied: false
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);
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if ($password !== $password_confirm)
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return new Response(
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payload: ["target" => "passwordConfirm", "message" => "Passwords do not match."],
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satisfied: false
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);
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// Begin transaction
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$this->conn->beginTransaction();
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// Check if email address is already in use
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$stmt = $this->conn->prepare("SELECT COUNT(*) AS count
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FROM users
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WHERE email=:email;");
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$stmt->bindValue(":email", $email);
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$stmt->execute();
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$result = $stmt->fetch(PDO::FETCH_ASSOC);
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if ($result["count"] > 0) {
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$this->conn->rollBack();
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return new Response(
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payload: ["target" => "email", "message" => "Email address already in use."],
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satisfied: false
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);
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}
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// Register user
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$stmt = $this->conn->prepare("INSERT INTO users (email,
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email_verification_token,
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email_verification_token_timestamp,
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password,
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password_update_time)
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VALUES (:email,
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lower(hex(randomblob(16))),
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unixepoch(),
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:password,
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unixepoch())
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RETURNING email_verification_token;");
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$stmt->bindValue(":email", $email);
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$stmt->bindValue(":password", password_hash($password, PASSWORD_DEFAULT));
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$stmt->execute();
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$email_verification_token = $stmt->fetchAll(PDO::FETCH_ASSOC)[0]["email_verification_token"];
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// Respond
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$this->conn->commit();
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$mailer->queue_registration($email, $email_verification_token);
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return new Response(payload: null, satisfied: true);
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}
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/**
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* Deletes the user with the given UUID.
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*
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* @param string $uuid the UUID of the user to delete
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* @return Response a response with message `null` if the user was deleted, or a response with a message explaining
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* what went wrong otherwise
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*/
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public function delete(string $uuid): Response
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{
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$stmt = $this->conn->prepare("DELETE FROM users WHERE uuid=:uuid;");
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$stmt->bindValue(":uuid", $uuid);
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$stmt->execute();
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$stmt = $this->conn->prepare("DELETE FROM trackings WHERE user_uuid=:uuid");
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$stmt->bindValue(":uuid", $uuid);
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$stmt->execute();
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return new Response(payload: null, satisfied: true);
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}
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/**
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* Validates a login attempt with the given email address and password.
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*
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* @param string $email the email address of the user whose password should be checked
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* @param string $password the password to check against the specified user
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* @return array{0: Response, 1: string|null} a response and the user's UUID
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*/
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public function check_login(string $email, string $password): array
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{
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if (!filter_var($email, FILTER_VALIDATE_EMAIL) || strlen($email) > self::MAX_EMAIL_LENGTH)
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return [
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new Response(
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payload: ["target" => "email", "message" => "Invalid email address."],
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satisfied: false
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),
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null
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];
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if (strlen($password) > self::MAX_PASSWORD_LENGTH)
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return [
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new Response(
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payload: ["target" => "password", "message" => "Incorrect combination of email and password."],
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satisfied: false
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),
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null
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];
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$stmt = $this->conn->prepare("SELECT uuid, password FROM users WHERE email=:email;");
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$stmt->bindValue(":email", $email);
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$stmt->execute();
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$results = $stmt->fetchAll(PDO::FETCH_ASSOC);
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if (sizeof($results) === 0 || !password_verify($password, $results[0]["password"])) {
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return [
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new Response(
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payload: ["target" => "password", "message" => "Incorrect combination of email and password."],
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satisfied: false
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),
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null
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];
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}
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return [new Response(payload: null, satisfied: true), $results[0]["uuid"]];
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}
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/**
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* Returns a satisfied response if a user with the given UUID exists, or an unsatisfied response otherwise.
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*
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* @param string $uuid the UUID of the user to check
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* @return Response a satisfied response if a user with the given UUID exists, or an unsatisfied response otherwise
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*/
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public function user_exists(string $uuid): Response
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{
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$stmt = $this->conn->prepare("SELECT EXISTS(SELECT 1 FROM users WHERE uuid=:uuid);");
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$stmt->bindValue(":uuid", $uuid);
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$stmt->execute();
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$result = $stmt->fetch();
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return $result[0] === 1
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? new Response(payload: null, satisfied: true)
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: new Response(payload: ["target" => null, "message" => null], satisfied: false);
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}
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/**
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* Returns the user with the given UUID.
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*
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* @param string $uuid the UUID of the user to return
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* @return Response the user with the given UUID, or a response with an explanation what went wrong otherwise
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*/
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public function get_user_data(string $uuid): Response
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{
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$stmt = $this->conn->prepare("SELECT uuid, email, email_verification_token IS NULL AS email_is_verified,
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password_update_time
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FROM users
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WHERE uuid=:uuid;");
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$stmt->bindValue(":uuid", $uuid);
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$stmt->execute();
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$user = $stmt->fetch(PDO::FETCH_ASSOC);
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if ($user === false)
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return new Response(
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payload: ["target" => "uuid", "message" => "Something went wrong. Please try logging in again."],
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satisfied: false
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);
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return new Response(payload: $user, satisfied: true);
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}
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/**
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* Updates the indicated user's email address.
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*
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* @param string $uuid the UUID of the user whose email address should be updated
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* @param string $email the new email address
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* @param Mailer $mailer the mailer to send a notification with to the user
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* @return Response a response with message `null` if the email address was updated, or a response with a message
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* explaining what went wrong otherwise
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*/
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public function set_email(string $uuid, string $email, Mailer $mailer): Response
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{
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// Validate
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if (!filter_var($email, FILTER_VALIDATE_EMAIL) || strlen($email) > self::MAX_EMAIL_LENGTH)
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return new Response(
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payload: ["target" => "email", "message" => "Invalid email address."],
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satisfied: false
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);
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// Begin transaction
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$this->conn->beginTransaction();
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// Check if email address is different
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$stmt = $this->conn->prepare("SELECT email FROM users WHERE uuid=:uuid;");
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$stmt->bindValue(":uuid", $uuid);
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$stmt->execute();
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$email_old = $stmt->fetch(PDO::FETCH_ASSOC)["email"];
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if (hash_equals($email_old, $email))
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return new Response(
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payload: ["target" => "email", "message" => "That is already your email address."],
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satisfied: false
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);
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// TODO: Reject update if email address was changed too recently (within, say, 5 minutes)
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// Check if email address is already in use
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$stmt = $this->conn->prepare("SELECT COUNT(*) AS count
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FROM users
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WHERE email=:email;");
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$stmt->bindValue(":email", $email);
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$stmt->execute();
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if ($stmt->fetch(PDO::FETCH_ASSOC)["count"] > 0) {
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$this->conn->rollBack();
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return new Response(
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payload: ["target" => "email", "message" => "Email address already in use."],
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satisfied: false
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);
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}
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// Update email address
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$stmt = $this->conn->prepare("UPDATE users
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SET email=:email,
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email_verification_token=lower(hex(randomblob(16))),
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email_verification_token_timestamp=unixepoch()
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WHERE uuid=:uuid
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RETURNING email_verification_token;");
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$stmt->bindValue(":uuid", $uuid);
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$stmt->bindValue(":email", $email);
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$stmt->execute();
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$email_verification_token = $stmt->fetchAll(PDO::FETCH_ASSOC)[0]["email_verification_token"];
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// Respond
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$this->conn->commit();
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$mailer->queue_verification($email, $email_verification_token);
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return new Response(payload: null, satisfied: true);
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}
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/**
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* Verifies an email address with a token.
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*
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* @param string $email the email address to verify
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* @param string $email_verification_token the token to verify the email address with
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* @return Response the server's response to the request
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*/
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public function verify_email(string $email, string $email_verification_token): Response
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{
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if (!filter_var($email, FILTER_VALIDATE_EMAIL) || strlen($email) > self::MAX_EMAIL_LENGTH)
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return new Response(
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payload: ["target" => "email", "message" => "Invalid email address."],
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satisfied: false
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);
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$this->conn->beginTransaction();
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$stmt = $this->conn->prepare("SELECT email_verification_token
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FROM users
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WHERE email=:email;");
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$stmt->bindValue(":email", $email);
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$stmt->execute();
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$result = $stmt->fetch(PDO::FETCH_ASSOC);
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// TODO: Reformat the following line
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if ($result === false ||
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($result["email_verification_token"] !== null
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&& !hash_equals($result["email_verification_token"], $email_verification_token))) {
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$this->conn->rollBack();
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return new Response(
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payload: ["target" => "email", "message" => "Failed to verify email address."],
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satisfied: false
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);
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}
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if ($result["email_verification_token"] === null) {
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// Email already verified, returning
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$this->conn->rollBack();
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return new Response(payload: null, satisfied: true);
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}
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$stmt = $this->conn->prepare("UPDATE users
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SET email_verification_token=null
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WHERE email=:email;");
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$stmt->bindValue(":email", $email);
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$stmt->execute();
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$this->conn->commit();
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return new Response(payload: null, satisfied: true);
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}
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/**
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* Resends the email verification email.
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*
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* @param string $uuid the UUID of the user to resend the email for
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* @param Mailer $mailer the mailer to send the email with to the user
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* @return Response a response with message `null` if the email was sent, or a response with a message explaining
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* what went wrong otherwise
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*/
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public function resend_verify_email(string $uuid, Mailer $mailer): Response
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{
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$this->conn->beginTransaction();
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$stmt = $this->conn->prepare("SELECT email, email_verification_token, email_verification_token_timestamp
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FROM users
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WHERE uuid=:uuid;");
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$stmt->bindValue(":uuid", $uuid);
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$stmt->execute();
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$user = $stmt->fetch(PDO::FETCH_ASSOC);
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if (!isset($user["email_verification_token"])) {
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$this->conn->rollBack();
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return new Response(
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payload: ["target" => null, "message" => "Your email address is already verified"],
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satisfied: false
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);
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}
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$verify_email_time = new DateTime("@{$user["email_verification_token_timestamp"]}");
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$minutes_since_last_verify_email = $verify_email_time->diff(new DateTime(), absolute: true)->i;
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if ($minutes_since_last_verify_email < self::MINUTES_BETWEEN_VERIFICATION_EMAILS) {
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$this->conn->rollBack();
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$minutes_left = self::MINUTES_BETWEEN_VERIFICATION_EMAILS - $minutes_since_last_verify_email;
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return new Response(
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payload: [
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"target" => null,
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"message" =>
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"A verification email was sent recently. " .
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"Please wait $minutes_left more minute(s) before requesting a new email."
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],
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satisfied: false
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);
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}
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$mailer->queue_verification($user["email"], $user["email_verification_token"]);
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$stmt = $this->conn->prepare("UPDATE users
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SET email_verification_token_timestamp=unixepoch()
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WHERE uuid=:uuid;");
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$stmt->bindValue(":uuid", $uuid);
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$stmt->execute();
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$this->conn->commit();
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return new Response(payload: null, satisfied: true);
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}
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/**
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* Updates the indicated user's password.
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*
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* @param string $uuid the UUID of the user whose password should be updated
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* @param string $password_old the old password
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* @param string $password_new the new password
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* @param string $password_confirm the confirmation of the new password
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* @return Response a response with message `null` if the password was updated, or a response with a message
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* explaining what went wrong otherwise
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*/
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public function set_password(string $uuid, string $password_old, string $password_new,
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string $password_confirm): Response
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{
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// Validate
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if (strlen($password_old) > self::MAX_PASSWORD_LENGTH)
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return new Response(
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payload: ["target" => "passwordOld", "message" => "Incorrect old password."],
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satisfied: false
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);
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if (strlen($password_new) < self::MIN_PASSWORD_LENGTH || strlen($password_new) > self::MAX_PASSWORD_LENGTH)
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return new Response(
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payload: [
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"target" => "passwordNew",
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"message" => "Your password should be at least 8 and at most 64 characters long."
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],
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satisfied: false
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);
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if ($password_new !== $password_confirm)
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return new Response(
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payload: ["target" => "passwordConfirm", "message" => "New passwords do not match."],
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satisfied: false
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);
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// Begin transaction
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$this->conn->beginTransaction();
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// Validate old password
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$stmt = $this->conn->prepare("SELECT password FROM users WHERE uuid=:uuid;");
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$stmt->bindValue(":uuid", $uuid);
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$stmt->execute();
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$user = $stmt->fetch(PDO::FETCH_ASSOC);
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if (!password_verify($password_old, $user["password"])) {
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$this->conn->rollBack();
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return new Response(
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payload: ["target" => "passwordOld", "message" => "Incorrect old password."],
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satisfied: false
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);
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}
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// Update password
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$stmt = $this->conn->prepare("UPDATE users
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SET password=:password, password_update_time=unixepoch()
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WHERE uuid=:uuid;");
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$stmt->bindValue(":uuid", $uuid);
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$stmt->bindValue(":password", password_hash($password_new, PASSWORD_DEFAULT));
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$stmt->execute();
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// Respond
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$this->conn->commit();
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return new Response(payload: null, satisfied: true);
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}
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}
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