README

CakePHP plugin to help using Glide image manipulation library.

The plugin consists of a middlware, view helper and a Glide response class.

Installation

Install the plugin through composer:

composer require admad/cakephp-glide

Load the plugin using CLI:

bin/cake plugin load ADmad/Glide

Usage

Middleware

In your config/routes.php setup the GlideMiddleware for required scope which intercepts requests and serves images generated by Glide. For e.g.:

$routes->scope('/images', function ($routes) {
    $routes->registerMiddleware('glide', new \ADmad\Glide\Middleware\GlideMiddleware([
        // Run this middleware only for URLs starting with specified string. Default null.
        // Setting this option is required only if you want to setup the middleware
        // in Application::middleware() instead of using router's scoped middleware.
        // It would normally be set to same value as that of server.base_url below.
        'path' => null,

        // Either a callable which returns an instance of League\Glide\Server
        // or config array to be used to create server instance.
        // http://glide.thephpleague.com/1.0/config/setup/
        'server' => [
            // Path or League\Flysystem adapter instance to read images from.
            // http://glide.thephpleague.com/1.0/config/source-and-cache/
            'source' => WWW_ROOT . 'uploads',

            // Path or League\Flysystem adapter instance to write cached images to.
            'cache' => WWW_ROOT . 'cache',

            // URL part to be omitted from source path. Defaults to "/images/"
            // http://glide.thephpleague.com/1.0/config/source-and-cache/#set-a-base-url
            'base_url' => '/images/',

            // Response class for serving images. If unset (default) an instance of
            // \ADmad\Glide\Response\PsrResponseFactory() will be used.
            // http://glide.thephpleague.com/1.0/config/responses/
            'response' => null,
        ],

        // http://glide.thephpleague.com/1.0/config/security/
        'security' => [
            // Boolean indicating whether secure URLs should be used to prevent URL
            // parameter manipulation. Default false.
            'secureUrls' => false,

            // Signing key used to generate / validate URLs if `secureUrls` is `true`.
            // If unset value of Cake\Utility\Security::salt() will be used.
            'signKey' => null,
        ],

        // Cache duration. Default '+1 days'.
        'cacheTime' => '+1 days',

        // Any response headers you may want to set. Default null.
        'headers' => [
            'X-Custom' => 'some-value',
        ],

        // Allowed query string params. If for e.g. you are only using glide presets
        // then you can set allowed params as `['p']` to prevent users from using
        // any other image manipulation params.
        'allowedParams' => null
    ]));

    $routes->applyMiddleware('glide');

    $routes->connect('/*');
});

For the example config shown above, for URL like domain.com/images/user/profile.jpg the source image should be under webroot/uploads/user/profile.jpg.

Note: Make sure the image URL does not directly map to image under webroot. Otherwise as per CakePHP's default URL rewriting rules the image will be served by webserver itself and request won't reach your CakePHP app.

Exceptions

If you have enabled secure URLs and a valid token is not present in query string the middleware will throw a ADmad\Glide\Exception\SignatureException exception.

If a response image could not be generated by the Glide library then by default the middleware will throw a ADmad\Glide\Exception\ResponseException. A Glide.response_failure event will also be triggered in this case. You can setup a listener for this event and return a response instance from it. In this case that response will be sent to client and ResponseException will not be thrown.

\Cake\Event\EventManager::instance()->on(
    \ADmad\Glide\Middleware\GlideMiddleware::RESPONSE_FAILURE_EVENT,
    function ($event) {
        return (new Response())
            ->withFile('/path/to/default-image.jpg');
    }
);

Helper

The provided GlideHelper helps creating URLs and image tags for generating images. You can load the helper in your AppView::initialize() as shown in example below:

public function initialize(): void
{
    // All option values should match the corresponding options for `GlideFilter`.
    $this->loadHelper('ADmad/Glide.Glide', [
        // Base URL.
        'baseUrl' => '/images/',
        // Whether to generate secure URLs.
        'secureUrls' => false,
        // Signing key to use when generating secure URLs.
        'signKey' => null,
    ]);
}

Here are the available methods of GlideHelper:

    /**
     * Creates a formatted IMG element.
     *
     * @param string $path Image path.
     * @param array $params Image manipulation parameters.
     * @param array $options Array of HTML attributes and options.
     *   See `$options` argument of `Cake\View\HtmlHelper::image()`.
     * @return string Complete <img> tag.
     */
    GlideHelper::image(string $path, array $params = [], array $options = []): string

    /**
     * URL with query string based on resizing params.
     *
     * @param string $path Image path.
     * @param array $params Image manipulation parameters.
     * @return string Image URL.
     */
    GlideHelper::url(string $path, array $params = []): string

The main benefit of using this helper is depending on the value of secureUrls config, the generated URLs will contain a token which will be verified by the middleware. The prevents modification of query string params.