BookStack/app/Config/app.php

<?php

/**
 * Global app configuration options.
 *
 * Changes to these config files are not supported by BookStack and may break upon updates.
 * Configuration should be altered via the `.env` file or environment variables.
 * Do not edit this file unless you're happy to maintain any changes yourself.
 */

use Illuminate\Support\Facades\Facade;
use Illuminate\Support\ServiceProvider;

return [

    // The environment to run BookStack in.
    // Options: production, development, demo, testing
    'env' => env('APP_ENV', 'production'),

    // Enter the application in debug mode.
    // Shows much more verbose error messages. Has potential to show
    // private configuration variables so should remain disabled in public.
    'debug' => env('APP_DEBUG', false),

    // The number of revisions to keep in the database.
    // Once this limit is reached older revisions will be deleted.
    // If set to false then a limit will not be enforced.
    'revision_limit' => env('REVISION_LIMIT', 100),

    // The number of days that content will remain in the recycle bin before
    // being considered for auto-removal. It is not a guarantee that content will
    // be removed after this time.
    // Set to 0 for no recycle bin functionality.
    // Set to -1 for unlimited recycle bin lifetime.
    'recycle_bin_lifetime' => env('RECYCLE_BIN_LIFETIME', 30),

    // The limit for all uploaded files, including images and attachments in MB.
    'upload_limit' => env('FILE_UPLOAD_SIZE_LIMIT', 50),

    // Allow <script> tags to entered within page content.
    // <script> tags are escaped by default.
    // Even when overridden the WYSIWYG editor may still escape script content.
    'allow_content_scripts' => env('ALLOW_CONTENT_SCRIPTS', false),

    // Allow server-side fetches to be performed to potentially unknown
    // and user-provided locations. Primarily used in exports when loading
    // in externally referenced assets.
    'allow_untrusted_server_fetching' => env('ALLOW_UNTRUSTED_SERVER_FETCHING', false),

    // Override the default behaviour for allowing crawlers to crawl the instance.
    // May be ignored if view has be overridden or modified.
    // Defaults to null since, if not set, 'app-public' status used instead.
    'allow_robots' => env('ALLOW_ROBOTS', null),

    // Application Base URL, Used by laravel in development commands
    // and used by BookStack in URL generation.
    'url' => env('APP_URL', '') === 'http://bookstack.dev' ? '' : env('APP_URL', ''),

    // A list of hosts that BookStack can be iframed within.
    // Space separated if multiple. BookStack host domain is auto-inferred.
    'iframe_hosts' => env('ALLOWED_IFRAME_HOSTS', null),

    // A list of sources/hostnames that can be loaded within iframes within BookStack.
    // Space separated if multiple. BookStack host domain is auto-inferred.
    // Can be set to a lone "*" to allow all sources for iframe content (Not advised).
    // Defaults to a set of common services.
    // Current host and source for the "DRAWIO" setting will be auto-appended to the sources configured.
    'iframe_sources' => env('ALLOWED_IFRAME_SOURCES', 'https://*.draw.io https://*.youtube.com https://*.youtube-nocookie.com https://*.vimeo.com'),

    // A list of the sources/hostnames that can be reached by application SSR calls.
    // This is used wherever users can provide URLs/hosts in-platform, like for webhooks.
    // Host-specific functionality (usually controlled via other options) like auth
    // or user avatars for example, won't use this list.
    // Space seperated if multiple. Can use '*' as a wildcard.
    // Values will be compared prefix-matched, case-insensitive, against called SSR urls.
    // Defaults to allow all hosts.
    'ssr_hosts' => env('ALLOWED_SSR_HOSTS', '*'),

    // Alter the precision of IP addresses stored by BookStack.
    // Integer value between 0 (IP hidden) to 4 (Full IP usage)
    'ip_address_precision' => env('IP_ADDRESS_PRECISION', 4),

    // Application timezone for back-end date functions.
    'timezone' => env('APP_TIMEZONE', 'UTC'),

    // Default locale to use
    // A default variant is also stored since Laravel can overwrite
    // app.locale when dynamically setting the locale in-app.
    'locale' => env('APP_LANG', 'en'),
    'default_locale' => env('APP_LANG', 'en'),

    //  Application Fallback Locale
    'fallback_locale' => 'en',

    // Faker Locale
    'faker_locale' => 'en_GB',

    // Auto-detect the locale for public users
    // For public users their locale can be guessed by headers sent by their
    // browser. This is usually set by users in their browser settings.
    // If not found the default app locale will be used.
    'auto_detect_locale' => env('APP_AUTO_LANG_PUBLIC', true),

    // Encryption key
    'key' => env('APP_KEY', 'AbAZchsay4uBTU33RubBzLKw203yqSqr'),

    // Encryption cipher
    'cipher' => 'AES-256-CBC',

    // Maintenance Mode Driver
    'maintenance' => [
        'driver' => 'file',
        // 'store'  => 'redis',
    ],

    // Application Service Providers
    'providers' => ServiceProvider::defaultProviders()->merge([
        // Third party service providers
        SocialiteProviders\Manager\ServiceProvider::class,

        // BookStack custom service providers
        BookStack\App\Providers\ThemeServiceProvider::class,
        BookStack\App\Providers\AppServiceProvider::class,
        BookStack\App\Providers\AuthServiceProvider::class,
        BookStack\App\Providers\EventServiceProvider::class,
        BookStack\App\Providers\RouteServiceProvider::class,
        BookStack\App\Providers\TranslationServiceProvider::class,
        BookStack\App\Providers\ValidationRuleServiceProvider::class,
        BookStack\App\Providers\ViewTweaksServiceProvider::class,
    ])->toArray(),

    // Class Aliases
    // This array of class aliases to be registered on application start.
    'aliases' => Facade::defaultAliases()->merge([
        // Laravel Packages
        'Socialite'    => Laravel\Socialite\Facades\Socialite::class,

        // Custom BookStack
        'Activity'    => BookStack\Facades\Activity::class,
        'Theme'       => BookStack\Facades\Theme::class,
    ])->toArray(),

    // Proxy configuration
    'proxies' => env('APP_PROXIES', ''),

];