app/Settings/SettingService.php
<?php
namespace BookStack\Settings;
use BookStack\Users\Models\User;
/**
* Class SettingService
* The settings are a simple key-value database store.
* For non-authenticated users, user settings are stored via the session instead.
* A local array-based cache is used to for setting accesses across a request.
*/
class SettingService
{
protected array $localCache = [];
/**
* Gets a setting from the database,
* If not found, Returns default, Which is false by default.
*/
public function get(string $key, $default = null): mixed
{
if (is_null($default)) {
$default = config('setting-defaults.' . $key, false);
}
$value = $this->getValueFromStore($key) ?? $default;
return $this->formatValue($value, $default);
}
/**
* 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->isGuest()) {
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 local cache.
* Will load the local cache if not previously loaded.
*/
protected function getValueFromStore(string $key): mixed
{
$cacheCategory = $this->localCacheCategory($key);
if (!isset($this->localCache[$cacheCategory])) {
$this->loadToLocalCache($cacheCategory);
}
return $this->localCache[$cacheCategory][$key] ?? null;
}
/**
* Put the given value into the local cached under the given key.
*/
protected function putValueIntoLocalCache(string $key, mixed $value): void
{
$cacheCategory = $this->localCacheCategory($key);
if (!isset($this->localCache[$cacheCategory])) {
$this->loadToLocalCache($cacheCategory);
}
$this->localCache[$cacheCategory][$key] = $value;
}
/**
* Get the category for the given setting key.
* Will return 'app' for a general app setting otherwise 'user:<user_id>' for a user setting.
*/
protected function localCacheCategory(string $key): string
{
if (str_starts_with($key, 'user:')) {
return implode(':', array_slice(explode(':', $key), 0, 2));
}
return 'app';
}
/**
* For the given category, load the relevant settings from the database into the local cache.
*/
protected function loadToLocalCache(string $cacheCategory): void
{
$query = Setting::query();
if ($cacheCategory === 'app') {
$query->where('setting_key', 'not like', 'user:%');
} else {
$query->where('setting_key', 'like', $cacheCategory . ':%');
}
$settings = $query->toBase()->get();
if (!isset($this->localCache[$cacheCategory])) {
$this->localCache[$cacheCategory] = [];
}
foreach ($settings as $setting) {
$value = $setting->value;
if ($setting->type === 'array') {
$value = json_decode($value, true) ?? [];
}
$this->localCache[$cacheCategory][$setting->setting_key] = $value;
}
}
/**
* Format a settings value.
*/
protected function formatValue(mixed $value, mixed $default): mixed
{
// Change string booleans to actual booleans
if ($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, mixed $value): bool
{
$setting = Setting::query()->firstOrNew([
'setting_key' => $key,
]);
$setting->type = 'string';
$setting->value = $value;
if (is_array($value)) {
$setting->type = 'array';
$setting->value = $this->formatArrayValue($value);
}
$setting->save();
$this->putValueIntoLocalCache($key, $value);
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.
* Can only take string value types since this may use
* the session which is less flexible to data types.
*/
public function putUser(User $user, string $key, string $value): bool
{
if ($user->isGuest()) {
session()->put($key, $value);
return true;
}
return $this->put($this->userKey($user->id, $key), $value);
}
/**
* Put a user-specific setting into the database for the current access user.
* Can only take string value types since this may use
* the session which is less flexible to data types.
*/
public function putForCurrentUser(string $key, string $value): bool
{
return $this->putUser(user(), $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();
}
$cacheCategory = $this->localCacheCategory($key);
if (isset($this->localCache[$cacheCategory])) {
unset($this->localCache[$cacheCategory][$key]);
}
}
/**
* Delete settings for a given user id.
*/
public function deleteUserSettings(string $userId): void
{
Setting::query()
->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 Setting::query()
->where('setting_key', '=', $key)
->first();
}
/**
* Empty the local setting value cache used by this service.
*/
public function flushCache(): void
{
$this->localCache = [];
}
}