move to psr-4 autoloader

1 files changed, 0 insertions, 704 deletions

diff --git a/classes/config.php b/classes/config.php
deleted file mode 100644
index 72d6c5106..000000000
--- a/classes/config.php
+++ /dev/null
@@ -1,704 +0,0 @@
-<?php
-class Config {
-	private const _ENVVAR_PREFIX = "TTRSS_";
-
-	const T_BOOL = 1;
-	const T_STRING = 2;
-	const T_INT = 3;
-
-	const SCHEMA_VERSION = 147;
-
-	/** override default values, defined below in _DEFAULTS[], prefixing with _ENVVAR_PREFIX:
-	 *
-	 * DB_TYPE becomes:
-	 *
-	 * .env (docker environment):
-	 *
-	 * TTRSS_DB_TYPE=pgsql
-	 *
-	 * or config.php:
-	 *
-	 * putenv('TTRSS_DB_TYPE=pgsql');
-	 *
-	 * note lack of quotes and spaces before and after "=".
-	 *
-	*/
-
-	/** database type: pgsql or mysql */
-	const DB_TYPE = "DB_TYPE";
-
-	/** database server hostname */
-	const DB_HOST = "DB_HOST";
-
-	/** database user */
-	const DB_USER = "DB_USER";
-
-	/** database name */
-	const DB_NAME = "DB_NAME";
-
-	/** database password */
-	const DB_PASS = "DB_PASS";
-
-	/** database server port */
-	const DB_PORT = "DB_PORT";
-
-	/** connection charset for MySQL. if you have a legacy database and/or experience
-	 * garbage unicode characters with this option, try setting it to a blank string. */
-	const MYSQL_CHARSET = "MYSQL_CHARSET";
-
-	/** this is a fallback falue for the CLI SAPI, it should be set to a fully-qualified tt-rss URL */
-	const SELF_URL_PATH = "SELF_URL_PATH";
-
-	/** operate in single user mode, disables all functionality related to
-	 * multiple users and authentication. enabling this assumes you have
-	 * your tt-rss directory protected by other means (e.g. http auth). */
-	const SINGLE_USER_MODE = "SINGLE_USER_MODE";
-
-	/** enables fallback update mode where tt-rss tries to update feeds in
-	 * background while tt-rss is open in your browser.
-	 * if you don't have a lot of feeds and don't want to or can't run
-	 * background processes while not running tt-rss, this method is generally
-	 * viable to keep your feeds up to date. */
-	const SIMPLE_UPDATE_MODE = "SIMPLE_UPDATE_MODE";
-
-	/** use this PHP CLI executable to start various tasks */
-	const PHP_EXECUTABLE = "PHP_EXECUTABLE";
-
-	/** base directory for lockfiles (must be writable) */
-	const LOCK_DIRECTORY = "LOCK_DIRECTORY";
-
-	/** base directory for local cache (must be writable) */
-	const CACHE_DIR = "CACHE_DIR";
-
-	/** directory for feed favicons (directory must be writable) */
-	const ICONS_DIR = "ICONS_DIR";
-
-	/** URL for feed favicons */
-	const ICONS_URL = "ICONS_URL";
-
-	/** auto create users authenticated via external modules */
-	const AUTH_AUTO_CREATE = "AUTH_AUTO_CREATE";
-
-	/** auto log in users authenticated via external modules i.e. auth_remote */
-	const AUTH_AUTO_LOGIN = "AUTH_AUTO_LOGIN";
-
-	/** unconditinally purge all articles older than this amount, in days
-	 * overrides user-controlled purge interval */
-	const FORCE_ARTICLE_PURGE = "FORCE_ARTICLE_PURGE";
-
-	/** default lifetime of a session (e.g. login) cookie. In seconds,
-	 * 0 means cookie will be deleted when browser closes. */
-	const SESSION_COOKIE_LIFETIME = "SESSION_COOKIE_LIFETIME";
-
-	/** send email using this name */
-	const SMTP_FROM_NAME = "SMTP_FROM_NAME";
-
-	/** send email using this address */
-	const SMTP_FROM_ADDRESS = "SMTP_FROM_ADDRESS";
-
-	/** default subject for email digest */
-	const DIGEST_SUBJECT = "DIGEST_SUBJECT";
-
-	/** enable built-in update checker, both for core code and plugins (using git) */
-	const CHECK_FOR_UPDATES = "CHECK_FOR_UPDATES";
-
-	/** system plugins enabled for all users, comma separated list, no quotes
-	 * keep at least one auth module in there (i.e. auth_internal) */
-	const PLUGINS = "PLUGINS";
-
-	/** available options: sql (default, event log), syslog, stdout (for debugging) */
-	const LOG_DESTINATION = "LOG_DESTINATION";
-
-	/** link this stylesheet on all pages (if it exists), should be placed in themes.local */
-	const LOCAL_OVERRIDE_STYLESHEET = "LOCAL_OVERRIDE_STYLESHEET";
-
-	/** same but this javascript file (you can use that for polyfills), should be placed in themes.local */
-	const LOCAL_OVERRIDE_JS = "LOCAL_OVERRIDE_JS";
-
-	/** in seconds, terminate update tasks that ran longer than this interval */
-	const DAEMON_MAX_CHILD_RUNTIME = "DAEMON_MAX_CHILD_RUNTIME";
-
-	/** max concurrent update jobs forking update daemon starts */
-	const DAEMON_MAX_JOBS = "DAEMON_MAX_JOBS";
-
-	/** How long to wait for response when requesting feed from a site (seconds)  */
-	const FEED_FETCH_TIMEOUT = "FEED_FETCH_TIMEOUT";
-
-	/** How long to wait for response when requesting uncached feed from a site (seconds)  */
-	const FEED_FETCH_NO_CACHE_TIMEOUT = "FEED_FETCH_NO_CACHE_TIMEOUT";
-
-	/** Default timeout when fetching files from remote sites */
-	const FILE_FETCH_TIMEOUT = "FILE_FETCH_TIMEOUT";
-
-	/** How long to wait for initial response from website when fetching remote files */
-	const FILE_FETCH_CONNECT_TIMEOUT = "FILE_FETCH_CONNECT_TIMEOUT";
-
-	/** stop updating feeds if user haven't logged in for X days */
-	const DAEMON_UPDATE_LOGIN_LIMIT = "DAEMON_UPDATE_LOGIN_LIMIT";
-
-	/** how many feeds to update in one batch */
-	const DAEMON_FEED_LIMIT = "DAEMON_FEED_LIMIT";
-
-	/** default sleep interval between feed updates (sec) */
-	const DAEMON_SLEEP_INTERVAL = "DAEMON_SLEEP_INTERVAL";
-
-	/** do not cache files larger than that (bytes) */
-	const MAX_CACHE_FILE_SIZE = "MAX_CACHE_FILE_SIZE";
-
-	/** do not download files larger than that (bytes) */
-	const MAX_DOWNLOAD_FILE_SIZE = "MAX_DOWNLOAD_FILE_SIZE";
-
-	/** max file size for downloaded favicons (bytes) */
-	const MAX_FAVICON_FILE_SIZE = "MAX_FAVICON_FILE_SIZE";
-
-	/** max age in days for various automatically cached (temporary) files */
-	const CACHE_MAX_DAYS = "CACHE_MAX_DAYS";
-
-	/** max interval between forced unconditional updates for servers
-	 * not complying with http if-modified-since (seconds) */
-	const MAX_CONDITIONAL_INTERVAL = "MAX_CONDITIONAL_INTERVAL";
-
-	/** automatically disable updates for feeds which failed to
-	 * update for this amount of days; 0 disables */
-	const DAEMON_UNSUCCESSFUL_DAYS_LIMIT = "DAEMON_UNSUCCESSFUL_DAYS_LIMIT";
-
-	/** log all sent emails in the event log */
-	const LOG_SENT_MAIL = "LOG_SENT_MAIL";
-
-	/** use HTTP proxy for requests */
-	const HTTP_PROXY = "HTTP_PROXY";
-
-	/** prevent users from changing passwords */
-	const FORBID_PASSWORD_CHANGES = "FORBID_PASSWORD_CHANGES";
-
-	/** default session cookie name */
-	const SESSION_NAME = "SESSION_NAME";
-
-	/** enable plugin update checker (using git) */
-	const CHECK_FOR_PLUGIN_UPDATES = "CHECK_FOR_PLUGIN_UPDATES";
-
-	/** allow installing first party plugins using plugin installer in prefs */
-	const ENABLE_PLUGIN_INSTALLER = "ENABLE_PLUGIN_INSTALLER";
-
-	/** minimum amount of seconds required between authentication attempts */
-	const AUTH_MIN_INTERVAL = "AUTH_MIN_INTERVAL";
-
-	/** http user agent (changing this is not recommended) */
-	const HTTP_USER_AGENT = "HTTP_USER_AGENT";
-
-	/** delay updates for this feed if received HTTP 429 (Too Many Requests) for this amount of seconds (base value, actual delay is base...base*2) */
-	const HTTP_429_THROTTLE_INTERVAL = "HTTP_429_THROTTLE_INTERVAL";
-
-	/** host running Jaeger collector to receive traces (disabled if empty) */
-	const OPENTELEMETRY_ENDPOINT = "OPENTELEMETRY_ENDPOINT";
-
-	/** Jaeger service name */
-	const OPENTELEMETRY_SERVICE = "OPENTELEMETRY_SERVICE";
-
-	/** default values for all global configuration options */
-	private const _DEFAULTS = [
-		Config::DB_TYPE => [ "pgsql", 									Config::T_STRING ],
-		Config::DB_HOST => [ "db", 										Config::T_STRING ],
-		Config::DB_USER => [ "",											Config::T_STRING ],
-		Config::DB_NAME => [ "", 											Config::T_STRING ],
-		Config::DB_PASS => [ "", 											Config::T_STRING ],
-		Config::DB_PORT => [ "5432",										Config::T_STRING ],
-		Config::MYSQL_CHARSET => [ "UTF8",								Config::T_STRING ],
-		Config::SELF_URL_PATH => [ "https://example.com/tt-rss", Config::T_STRING ],
-		Config::SINGLE_USER_MODE => [ "",								Config::T_BOOL ],
-		Config::SIMPLE_UPDATE_MODE => [ "",								Config::T_BOOL ],
-		Config::PHP_EXECUTABLE => [ "/usr/bin/php",					Config::T_STRING ],
-		Config::LOCK_DIRECTORY => [ "lock",								Config::T_STRING ],
-		Config::CACHE_DIR => [ "cache",									Config::T_STRING ],
-		Config::ICONS_DIR => [ "feed-icons",							Config::T_STRING ],
-		Config::ICONS_URL => [ "feed-icons",							Config::T_STRING ],
-		Config::AUTH_AUTO_CREATE => [ "true",							Config::T_BOOL ],
-		Config::AUTH_AUTO_LOGIN => [ "true",							Config::T_BOOL ],
-		Config::FORCE_ARTICLE_PURGE => [ 0,								Config::T_INT ],
-		Config::SESSION_COOKIE_LIFETIME => [ 86400,					Config::T_INT ],
-		Config::SMTP_FROM_NAME => [ "Tiny Tiny RSS",					Config::T_STRING ],
-		Config::SMTP_FROM_ADDRESS => [ "noreply@localhost",		Config::T_STRING ],
-		Config::DIGEST_SUBJECT => [ "[tt-rss] New headlines for last 24 hours",
-																					Config::T_STRING ],
-		Config::CHECK_FOR_UPDATES => [ "true",							Config::T_BOOL ],
-		Config::PLUGINS => [ "auth_internal",							Config::T_STRING ],
-		Config::LOG_DESTINATION => [ Logger::LOG_DEST_SQL,			Config::T_STRING ],
-		Config::LOCAL_OVERRIDE_STYLESHEET => [ "local-overrides.css",
-																					Config::T_STRING ],
-		Config::LOCAL_OVERRIDE_JS => [ "local-overrides.js",
-																					Config::T_STRING ],
-		Config::DAEMON_MAX_CHILD_RUNTIME => [ 1800,					Config::T_INT ],
-		Config::DAEMON_MAX_JOBS => [ 2,									Config::T_INT ],
-		Config::FEED_FETCH_TIMEOUT => [ 45,								Config::T_INT ],
-		Config::FEED_FETCH_NO_CACHE_TIMEOUT => [ 15,					Config::T_INT ],
-		Config::FILE_FETCH_TIMEOUT => [ 45,								Config::T_INT ],
-		Config::FILE_FETCH_CONNECT_TIMEOUT => [ 15,					Config::T_INT ],
-		Config::DAEMON_UPDATE_LOGIN_LIMIT => [ 30,					Config::T_INT ],
-		Config::DAEMON_FEED_LIMIT => [ 500,								Config::T_INT ],
-		Config::DAEMON_SLEEP_INTERVAL => [ 120,						Config::T_INT ],
-		Config::MAX_CACHE_FILE_SIZE => [ 64*1024*1024,				Config::T_INT ],
-		Config::MAX_DOWNLOAD_FILE_SIZE => [ 16*1024*1024,			Config::T_INT ],
-		Config::MAX_FAVICON_FILE_SIZE => [ 1*1024*1024,				Config::T_INT ],
-		Config::CACHE_MAX_DAYS => [ 7,									Config::T_INT ],
-		Config::MAX_CONDITIONAL_INTERVAL => [ 3600*12,				Config::T_INT ],
-		Config::DAEMON_UNSUCCESSFUL_DAYS_LIMIT => [ 30,				Config::T_INT ],
-		Config::LOG_SENT_MAIL => [ "",									Config::T_BOOL ],
-		Config::HTTP_PROXY => [ "",										Config::T_STRING ],
-		Config::FORBID_PASSWORD_CHANGES => [ "",						Config::T_BOOL ],
-		Config::SESSION_NAME => [ "ttrss_sid",							Config::T_STRING ],
-		Config::CHECK_FOR_PLUGIN_UPDATES => [ "true",				Config::T_BOOL ],
-		Config::ENABLE_PLUGIN_INSTALLER => [ "true",					Config::T_BOOL ],
-		Config::AUTH_MIN_INTERVAL => [ 5,								Config::T_INT ],
-		Config::HTTP_USER_AGENT => [ 'Tiny Tiny RSS/%s (https://tt-rss.org/)',
-																					Config::T_STRING ],
-		Config::HTTP_429_THROTTLE_INTERVAL => [ 3600,				Config::T_INT ],
-		Config::OPENTELEMETRY_ENDPOINT => [ "",							Config::T_STRING ],
-		Config::OPENTELEMETRY_SERVICE => [ "tt-rss",					Config::T_STRING ],
-	];
-
-	/** @var Config|null */
-	private static $instance;
-
-	/** @var array<string, array<bool|int|string>> */
-	private $params = [];
-
-	/** @var array<string, mixed> */
-	private $version = [];
-
-	/** @var Db_Migrations|null $migrations */
-	private $migrations;
-
-	public static function get_instance() : Config {
-		if (self::$instance == null)
-			self::$instance = new self();
-
-		return self::$instance;
-	}
-
-	private function __clone() {
-		//
-	}
-
-	function __construct() {
-		$ref = new ReflectionClass(get_class($this));
-
-		foreach ($ref->getConstants() as $const => $cvalue) {
-			if (isset(self::_DEFAULTS[$const])) {
-				$override = getenv(self::_ENVVAR_PREFIX . $const);
-
-				list ($defval, $deftype) = self::_DEFAULTS[$const];
-
-				$this->params[$cvalue] = [ self::cast_to($override !== false ? $override : $defval, $deftype), $deftype ];
-			}
-		}
-	}
-
-	/** determine tt-rss version (using git)
-	 *
-	 * package maintainers who don't use git: if version_static.txt exists in tt-rss root
-	 * directory, its contents are displayed instead of git commit-based version, this could be generated
-	 * based on source git tree commit used when creating the package
-	 * @return array<string, mixed>|string
-	 */
-	static function get_version(bool $as_string = true) {
-		return self::get_instance()->_get_version($as_string);
-	}
-
-	// returns version showing (if possible) full timestamp of commit id
-	static function get_version_html() : string {
-		$version = self::get_version(false);
-
-		return sprintf("<span title=\"%s\n%s\n%s\">%s</span>",
-			date("Y-m-d H:i:s", ($version['timestamp'] ?? 0)),
-				$version['commit'] ?? '',
-				$version['branch'] ?? '',
-				$version['version']);
-	}
-
-	/**
-	 * @return array<string, mixed>|string
-	 */
-	private function _get_version(bool $as_string = true) {
-		$root_dir = dirname(__DIR__);
-
-		if (empty($this->version)) {
-			$this->version["status"] = -1;
-
-			if (getenv("CI_COMMIT_SHORT_SHA") && getenv("CI_COMMIT_TIMESTAMP")) {
-
-				$this->version["branch"] = getenv("CI_COMMIT_BRANCH");
-				$this->version["timestamp"] = strtotime(getenv("CI_COMMIT_TIMESTAMP"));
-				$this->version["version"] = sprintf("%s-%s", date("y.m", $this->version["timestamp"]), getenv("CI_COMMIT_SHORT_SHA"));
-				$this->version["commit"] = getenv("CI_COMMIT_SHORT_SHA");
-				$this->version["status"] = 0;
-
-			} else if (PHP_OS === "Darwin") {
-				$this->version["version"] = "UNKNOWN (Unsupported, Darwin)";
-			} else if (file_exists("$root_dir/version_static.txt")) {
-				$this->version["version"] = trim(file_get_contents("$root_dir/version_static.txt")) . " (Unsupported)";
-			} else if (ini_get("open_basedir")) {
-				$this->version["version"] = "UNKNOWN (Unsupported, open_basedir)";
-			} else if (is_dir("$root_dir/.git")) {
-				$this->version = self::get_version_from_git($root_dir);
-
-				if ($this->version["status"] != 0) {
-					user_error("Unable to determine version: " . $this->version["version"], E_USER_WARNING);
-
-					$this->version["version"] = "UNKNOWN (Unsupported, Git error)";
-				} else if (!getenv("SCRIPT_ROOT") || !file_exists("/.dockerenv")) {
-					$this->version["version"] .= " (Unsupported)";
-				}
-
-			} else {
-				$this->version["version"] = "UNKNOWN (Unsupported)";
-			}
-		}
-
-		return $as_string ? $this->version["version"] : $this->version;
-	}
-
-	/**
-	 * @return array<string, int|string>
-	 */
-	static function get_version_from_git(string $dir): array {
-		$descriptorspec = [
-			1 => ["pipe", "w"], // STDOUT
-			2 => ["pipe", "w"], // STDERR
-		];
-
-		$rv = [
-			"status" => -1,
-			"version" => "",
-			"branch" => "",
-			"commit" => "",
-			"timestamp" => 0,
-		];
-
-		$proc = proc_open("git --no-pager log --pretty=\"version-%ct-%h\" -n1 HEAD",
-						$descriptorspec, $pipes, $dir);
-
-		if (is_resource($proc)) {
-			$stdout = trim(stream_get_contents($pipes[1]));
-			$stderr = trim(stream_get_contents($pipes[2]));
-			$status = proc_close($proc);
-
-			$rv["status"] = $status;
-
-			list($check, $timestamp, $commit) = explode("-", $stdout);
-
-			if ($check == "version") {
-
-				$rv["version"] = sprintf("%s-%s", date("y.m", (int)$timestamp), $commit);
-				$rv["commit"] = $commit;
-				$rv["timestamp"] = $timestamp;
-
-				// proc_close() may return -1 even if command completed successfully
-				// so if it looks like we got valid data, we ignore it
-
-				if ($rv["status"] == -1)
-					$rv["status"] = 0;
-
-			} else {
-				$rv["version"] = T_sprintf("Git error [RC=%d]: %s", $status, $stderr);
-			}
-		}
-
-		return $rv;
-	}
-
-	static function get_migrations() : Db_Migrations {
-		return self::get_instance()->_get_migrations();
-	}
-
-	private function _get_migrations() : Db_Migrations {
-		if (empty($this->migrations)) {
-			$this->migrations = new Db_Migrations();
-			$this->migrations->initialize(dirname(__DIR__) . "/sql", "ttrss_version", true, self::SCHEMA_VERSION);
-		}
-
-		return $this->migrations;
-	}
-
-	static function is_migration_needed() : bool {
-		return self::get_migrations()->is_migration_needed();
-	}
-
-	static function get_schema_version() : int {
-		return self::get_migrations()->get_version();
-	}
-
-	/**
-	 * @return bool|int|string
-	 */
-	static function cast_to(string $value, int $type_hint) {
-		switch ($type_hint) {
-			case self::T_BOOL:
-				return sql_bool_to_bool($value);
-			case self::T_INT:
-				return (int) $value;
-			default:
-				return $value;
-		}
-	}
-
-	/**
-	 * @return bool|int|string
-	 */
-	private function _get(string $param) {
-		list ($value, $type_hint) = $this->params[$param];
-
-		return $this->cast_to($value, $type_hint);
-	}
-
-	private function _add(string $param, string $default, int $type_hint): void {
-		$override = getenv(self::_ENVVAR_PREFIX . $param);
-
-		$this->params[$param] = [ self::cast_to($override !== false ? $override : $default, $type_hint), $type_hint ];
-	}
-
-	static function add(string $param, string $default, int $type_hint = Config::T_STRING): void {
-		$instance = self::get_instance();
-
-		$instance->_add($param, $default, $type_hint);
-	}
-
-	/**
-	 * @return bool|int|string
-	 */
-	static function get(string $param) {
-		$instance = self::get_instance();
-
-		return $instance->_get($param);
-	}
-
-	static function is_server_https() : bool {
-		return (!empty($_SERVER['HTTPS']) && ($_SERVER['HTTPS'] != 'off')) ||
-			(!empty($_SERVER['HTTP_X_FORWARDED_PROTO']) && $_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https');
-	}
-
-	/** returns fully-qualified external URL to tt-rss (no trailing slash)
-	 * SELF_URL_PATH configuration variable is used as a fallback for the CLI SAPI
-	 * */
-	static function get_self_url(bool $always_detect = false) : string {
-		if (!$always_detect && php_sapi_name() == "cli") {
-			return self::get(Config::SELF_URL_PATH);
-		} else {
-			$proto = self::is_server_https() ? 'https' : 'http';
-
-			$self_url_path = $proto . '://' . $_SERVER["HTTP_HOST"] . parse_url($_SERVER["REQUEST_URI"], PHP_URL_PATH);
-			$self_url_path = preg_replace("/(\/api\/{1,})?(\w+\.php)?(\?.*$)?$/", "", $self_url_path);
-
-			if (substr($self_url_path, -1) === "/") {
-				return substr($self_url_path, 0, -1);
-			} else {
-				return $self_url_path;
-			}
-		}
-	}
-	/* sanity check stuff */
-
-	/** checks for mysql tables not using InnoDB (tt-rss is incompatible with MyISAM)
-	 * @return array<int, array<string, string>> A list of entries identifying tt-rss tables with bad config
-	 */
-	private static function check_mysql_tables() {
-		$pdo = Db::pdo();
-
-		$sth = $pdo->prepare("SELECT engine, table_name FROM information_schema.tables WHERE
-				table_schema = ? AND table_name LIKE 'ttrss_%' AND engine != 'InnoDB'");
-		$sth->execute([self::get(Config::DB_NAME)]);
-
-		$bad_tables = [];
-
-		while ($line = $sth->fetch()) {
-			array_push($bad_tables, $line);
-		}
-
-		return $bad_tables;
-	}
-
-	static function sanity_check(): void {
-
-		/*
-			we don't actually need the DB object right now but some checks below might use ORM which won't be initialized
-			because it is set up in the Db constructor, which is why it's a good idea to invoke it as early as possible
-
-			it is a bit of a hack, maybe ORM should be initialized somewhere else (functions.php?)
-		*/
-
-		$pdo = Db::pdo();
-
-		$errors = [];
-
-		if (strpos(self::get(Config::PLUGINS), "auth_") === false) {
-			array_push($errors, "Please enable at least one authentication module via PLUGINS");
-		}
-
-		/* we assume our dependencies are sane under docker, so some sanity checks are skipped.
-			this also allows tt-rss process to run under root if requested (I'm using this for development
-			under podman because of uidmapping issues with rootless containers, don't use in production -fox) */
-		if (!getenv("container")) {
-			if (function_exists('posix_getuid') && posix_getuid() == 0) {
-				array_push($errors, "Please don't run this script as root.");
-			}
-
-			if (version_compare(PHP_VERSION, '7.4.0', '<')) {
-				array_push($errors, "PHP version 7.4.0 or newer required. You're using " . PHP_VERSION . ".");
-			}
-
-			if (!class_exists("UConverter")) {
-				array_push($errors, "PHP UConverter class is missing, it's provided by the Internationalization (intl) module.");
-			}
-
-			if (!function_exists("curl_init") && !ini_get("allow_url_fopen")) {
-				array_push($errors, "PHP configuration option allow_url_fopen is disabled, and CURL functions are not present. Either enable allow_url_fopen or install PHP extension for CURL.");
-			}
-
-			if (!function_exists("json_encode")) {
-				array_push($errors, "PHP support for JSON is required, but was not found.");
-			}
-
-			if (!function_exists("flock")) {
-				array_push($errors, "PHP support for flock() function is required.");
-			}
-
-			if (!class_exists("PDO")) {
-				array_push($errors, "PHP support for PDO is required but was not found.");
-			}
-
-			if (!function_exists("mb_strlen")) {
-				array_push($errors, "PHP support for mbstring functions is required but was not found.");
-			}
-
-			if (!function_exists("hash")) {
-				array_push($errors, "PHP support for hash() function is required but was not found.");
-			}
-
-			if (ini_get("safe_mode")) {
-				array_push($errors, "PHP safe mode setting is obsolete and not supported by tt-rss.");
-			}
-
-			if (!function_exists("mime_content_type")) {
-				array_push($errors, "PHP function mime_content_type() is missing, try enabling fileinfo module.");
-			}
-
-			if (!class_exists("DOMDocument")) {
-				array_push($errors, "PHP support for DOMDocument is required, but was not found.");
-			}
-		}
-
-		if (!is_writable(self::get(Config::CACHE_DIR) . "/images")) {
-			array_push($errors, "Image cache is not writable (chmod -R 777 ".self::get(Config::CACHE_DIR)."/images)");
-		}
-
-		if (!is_writable(self::get(Config::CACHE_DIR) . "/upload")) {
-			array_push($errors, "Upload cache is not writable (chmod -R 777 ".self::get(Config::CACHE_DIR)."/upload)");
-		}
-
-		if (!is_writable(self::get(Config::CACHE_DIR) . "/export")) {
-			array_push($errors, "Data export cache is not writable (chmod -R 777 ".self::get(Config::CACHE_DIR)."/export)");
-		}
-
-		if (!is_writable(self::get(Config::ICONS_DIR))) {
-			array_push($errors, "ICONS_DIR defined in config.php is not writable (chmod -R 777 ".self::get(Config::ICONS_DIR).").\n");
-		}
-
-		if (!is_writable(self::get(Config::LOCK_DIRECTORY))) {
-			array_push($errors, "LOCK_DIRECTORY is not writable (chmod -R 777 ".self::get(Config::LOCK_DIRECTORY).").\n");
-		}
-
-		// ttrss_users won't be there on initial startup (before migrations are done)
-		if (!Config::is_migration_needed() && self::get(Config::SINGLE_USER_MODE)) {
-			if (UserHelper::get_login_by_id(1) != "admin") {
-				array_push($errors, "SINGLE_USER_MODE is enabled but default admin account (ID: 1) is not found.");
-			}
-		}
-
-		// skip check for CLI scripts so that we could install database schema if it is missing.
-		if (php_sapi_name() != "cli") {
-			if (self::get_schema_version() < 0) {
-				array_push($errors, "Base database schema is missing. Either load it manually or perform a migration (<code>update.php --update-schema</code>)");
-			}
-		}
-
-		if (self::get(Config::DB_TYPE) == "mysql") {
-			$bad_tables = self::check_mysql_tables();
-
-			if (count($bad_tables) > 0) {
-				$bad_tables_fmt = [];
-
-				foreach ($bad_tables as $bt) {
-					array_push($bad_tables_fmt, sprintf("%s (%s)", $bt['table_name'], $bt['engine']));
-				}
-
-				$msg = "<p>The following tables use an unsupported MySQL engine: <b>" .
-					implode(", ", $bad_tables_fmt) . "</b>.</p>";
-
-				$msg .= "<p>The only supported engine on MySQL is InnoDB. MyISAM lacks functionality to run
-					tt-rss.
-					Please backup your data (via OPML) and re-import the schema before continuing.</p>
-					<p><b>WARNING: importing the schema would mean LOSS OF ALL YOUR DATA.</b></p>";
-
-
-				array_push($errors, $msg);
-			}
-		}
-
-		if (count($errors) > 0 && php_sapi_name() != "cli") { ?>
-			<!DOCTYPE html>
-			<html>
-				<head>
-					<title>Startup failed</title>
-					<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
-					<link rel="stylesheet" type="text/css" href="themes/light.css">
-				</head>
-				<body class="sanity_failed flat ttrss_utility">
-					<div class="content">
-						<h1>Startup failed</h1>
-
-						<p>Please fix errors indicated by the following messages:</p>
-
-						<?php foreach ($errors as $error) { echo self::format_error($error); } ?>
-
-						<p>You might want to check tt-rss <a target="_blank" href="https://tt-rss.org/wiki.php">wiki</a> or the
-							<a target="_blank" href="https://community.tt-rss.org/">forums</a> for more information. Please search the forums before creating new topic
-							for your question.</p>
-					</div>
-				</body>
-			</html>
-
-		<?php
-			die;
-		} else if (count($errors) > 0) {
-			echo "Please fix errors indicated by the following messages:\n\n";
-
-			foreach ($errors as $error) {
-				echo " * " . strip_tags($error)."\n";
-			}
-
-			echo "\nYou might want to check tt-rss wiki or the forums for more information.\n";
-			echo "Please search the forums before creating new topic for your question.\n";
-
-			exit(1);
-		}
-	}
-
-	private static function format_error(string $msg): string {
-		return "<div class=\"alert alert-danger\">$msg</div>";
-	}
-
-	static function get_override_links(): string {
-		$rv = "";
-
-		$local_css = get_theme_path(self::get(self::LOCAL_OVERRIDE_STYLESHEET));
-		if ($local_css) $rv .= stylesheet_tag($local_css);
-
-		$local_js = get_theme_path(self::get(self::LOCAL_OVERRIDE_JS));
-		if ($local_js) $rv .= javascript_tag($local_js);
-
-		return $rv;
-	}
-
-	static function get_user_agent(): string {
-		return sprintf(self::get(self::HTTP_USER_AGENT), self::get_version());
-	}
-}