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<?php
namespace BookStack\Settings;
use BookStack\Auth\User;
use Illuminate\Contracts\Cache\Repository as Cache;
/**
* Class SettingService
* The settings are a simple key-value database store.
* For non-authenticated users, user settings are stored via the session instead.
*/
class SettingService
{
protected $setting;
protected $cache;
protected $localCache = [];
protected $cachePrefix = 'setting-';
/**
* SettingService constructor.
*/
public function __construct(Setting $setting, Cache $cache)
{
$this->setting = $setting;
$this->cache = $cache;
}
/**
* Gets a setting from the database,
* If not found, Returns default, Which is false by default.
*/
public function get(string $key, $default = null)
{
if (is_null($default)) {
$default = config('setting-defaults.' . $key, false);
}
if (isset($this->localCache[$key])) {
return $this->localCache[$key];
}
$value = $this->getValueFromStore($key) ?? $default;
$formatted = $this->formatValue($value, $default);
$this->localCache[$key] = $formatted;
return $formatted;
}
/**
* Get a value from the session instead of the main store option.
*/
protected function getFromSession(string $key, $default = false)
{
$value = session()->get($key, $default);
return $this->formatValue($value, $default);
}
/**
* Get a user-specific setting from the database or cache.
*/
public function getUser(User $user, string $key, $default = null)
{
if (is_null($default)) {
$default = config('setting-defaults.user.' . $key, false);
}
if ($user->isDefault()) {
return $this->getFromSession($key, $default);
}
return $this->get($this->userKey($user->id, $key), $default);
}
/**
* Get a value for the current logged-in user.
*/
public function getForCurrentUser(string $key, $default = null)
{
return $this->getUser(user(), $key, $default);
}
/**
* Gets a setting value from the cache or database.
* Looks at the system defaults if not cached or in database.
* Returns null if nothing is found.
*/
protected function getValueFromStore(string $key)
{
// Check the cache
$cacheKey = $this->cachePrefix . $key;
$cacheVal = $this->cache->get($cacheKey, null);
if ($cacheVal !== null) {
return $cacheVal;
}
// Check the database
$settingObject = $this->getSettingObjectByKey($key);
if ($settingObject !== null) {
$value = $settingObject->value;
if ($settingObject->type === 'array') {
$value = json_decode($value, true) ?? [];
}
$this->cache->forever($cacheKey, $value);
return $value;
}
return null;
}
/**
* Clear an item from the cache completely.
*/
protected function clearFromCache(string $key)
{
$cacheKey = $this->cachePrefix . $key;
$this->cache->forget($cacheKey);
if (isset($this->localCache[$key])) {
unset($this->localCache[$key]);
}
}
/**
* Format a settings value.
*/
protected function formatValue($value, $default)
{
// Change string booleans to actual booleans
if ($value === 'true') {
$value = true;
} elseif ($value === 'false') {
$value = false;
}
// Set to default if empty
if ($value === '') {
$value = $default;
}
return $value;
}
/**
* Checks if a setting exists.
*/
public function has(string $key): bool
{
$setting = $this->getSettingObjectByKey($key);
return $setting !== null;
}
/**
* Add a setting to the database.
* Values can be an array or a string.
*/
public function put(string $key, $value): bool
{
$setting = $this->setting->newQuery()->firstOrNew([
'setting_key' => $key,
]);
$setting->type = 'string';
if (is_array($value)) {
$setting->type = 'array';
$value = $this->formatArrayValue($value);
}
$setting->value = $value;
$setting->save();
$this->clearFromCache($key);
return true;
}
/**
* Format an array to be stored as a setting.
* Array setting types are expected to be a flat array of child key=>value array items.
* This filters out any child items that are empty.
*/
protected function formatArrayValue(array $value): string
{
$values = collect($value)->values()->filter(function (array $item) {
return count(array_filter($item)) > 0;
});
return json_encode($values);
}
/**
* Put a user-specific setting into the database.
*/
public function putUser(User $user, string $key, string $value): bool
{
if ($user->isDefault()) {
session()->put($key, $value);
return true;
}
return $this->put($this->userKey($user->id, $key), $value);
}
/**
* Convert a setting key into a user-specific key.
*/
protected function userKey(string $userId, string $key = ''): string
{
return 'user:' . $userId . ':' . $key;
}
/**
* Removes a setting from the database.
*/
public function remove(string $key): void
{
$setting = $this->getSettingObjectByKey($key);
if ($setting) {
$setting->delete();
}
$this->clearFromCache($key);
}
/**
* Delete settings for a given user id.
*/
public function deleteUserSettings(string $userId)
{
return $this->setting->newQuery()
->where('setting_key', 'like', $this->userKey($userId) . '%')
->delete();
}
/**
* Gets a setting model from the database for the given key.
*/
protected function getSettingObjectByKey(string $key): ?Setting
{
return $this->setting->newQuery()
->where('setting_key', '=', $key)->first();
}
}