AssetManager.php

<?php

namespace App\Asset;

use App\Asset\AssetManagerInterface;

class AssetManager implements AssetManagerInterface
{
    /** @var string */
    private $webpackAssetHash;

    /**
     * The assest that were compiled via Amezmo's custom generator
     * @var string
     */
    private $amezmoAssetHash;

    /** @var bool */
    private $debug;

    /** @var string */
    private $cdn;

    public function __construct($basePath, $debug, $cdn)
    {
        $this->webpackAssetHash = file_get_contents($basePath . '/webpack-hash.txt');
        $this->amezmoAssetHash = AMEZMO_ASSET_VERSION_HASH;
        $this->debug = $debug;
        $this->cdn = $cdn;
    }

    /**
     * Return the versioned javascript asset
     *
     * @return string
     */
    public function js()
    {
        return $this->cdn . '/dist/app.'.$this->webpackAssetHash.'.js';
    }

    /**
     * Return a versioned compiled css file
     *
     * @return string
     */
    public function css()
    {
        return $this->cdn . '/dist/app.'.$this->webpackAssetHash.'.css';
    }

    /**
     * Return fully qualified asset URL, using the CDN_ENDPOINT
     *
     * @param string $assetPath
     * @return void
     */
    public function url($assetPath)
    {
        if ($assetPath[0] === '/') {
            $assetPath = substr($assetPath, 1);
        }

        // With debug, we will not insert the hash, but a timestamp in order to prevent the browser
        // from caching it
        if ($this->debug) {
            return $this->cdn . '/' . $assetPath . '?t=' . time();
        }

        /** @var \SplFileInfo $fileInfo **/
        $fileInfo = new \SplFileInfo($assetPath);

        if (in_array($fileInfo->getExtension(), ['js', 'css'])) {
            return $this->cdn . '/' . $this->versionedAsset($assetPath);
        }

        return $this->cdn . '/' . $assetPath;
    }

    /**
     * Return the asset path for the Stripe integration
     *
     * @return string
     */
    public function stripe()
    {
        if ($this->$debug) {
            return $this->cdn . '/js/stripe.js?t=' . time();
        }

        return $this->cdn . '/js/stripe.'.$this->amezmoAssetHash.'.js';
    }

    /**
     * This function splits the path name in order to insert an amezmo version hash between the filename
     * and the file extension
     *
     * x.js => x.$AMEZMO_VERSION.js
     *
     * @param string $asset
     * @return string
     */
    public function versionedAsset($asset)
    {
        $components = explode('.', $asset);
        $componentsCount = count($components);
        $buffer = '';

        foreach ($components as $index => $component) {
            if ($index === $componentsCount - 2) {
                if ($index != 0) {
                    $buffer .= '.';
                }
                $buffer .= $component . '.' . $this->amezmoAssetHash;
            } else {
                if ($index != 0) {
                    $buffer .= '.';
                }
                $buffer .= $component;
            }
        }

        return $buffer;
    }
}