From 114dbb4022defc62e882b0c5c9ed9f2d99825b46 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Tim=20D=C3=BCsterhus?= <duesterhus@woltlab.com>
Date: Wed, 15 Jul 2020 11:24:12 +0200
Subject: [PATCH] Add FontManager

see #3394
---
 .../lib/system/style/FontManager.class.php    | 118 ++++++++++++++++++
 .../exception/FontDownloadFailed.class.php    |  31 +++++
 2 files changed, 149 insertions(+)
 create mode 100644 wcfsetup/install/files/lib/system/style/FontManager.class.php
 create mode 100644 wcfsetup/install/files/lib/system/style/exception/FontDownloadFailed.class.php

diff --git a/wcfsetup/install/files/lib/system/style/FontManager.class.php b/wcfsetup/install/files/lib/system/style/FontManager.class.php
new file mode 100644
index 0000000000..0e2907876d
--- /dev/null
+++ b/wcfsetup/install/files/lib/system/style/FontManager.class.php
@@ -0,0 +1,118 @@
+<?php
+namespace wcf\system\style;
+use GuzzleHttp\ClientInterface;
+use GuzzleHttp\Exception\ClientException;
+use GuzzleHttp\Exception\RequestException;
+use GuzzleHttp\Psr7\Request;
+use wcf\system\io\AtomicWriter;
+use wcf\system\io\HttpFactory;
+use wcf\system\SingletonFactory;
+use wcf\system\style\exception\FontDownloadFailed;
+use wcf\util\FileUtil;
+use wcf\util\JSON;
+
+/**
+ * Manages webfont families.
+ * 
+ * @author	Tim Duesterhus
+ * @copyright	2001-2020 WoltLab GmbH
+ * @license	GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
+ * @package	WoltLabSuite\Core\System\Style
+ * @since	5.3
+ */
+class FontManager extends SingletonFactory {
+	/**
+	 * @var ClientInterface
+	 */
+	protected $http;
+	
+	/**
+	 * @inheritDoc
+	 */
+	protected function init() {
+		$this->http = HttpFactory::makeClient([
+			'base_uri' => 'https://fonts.woltlab.com/'
+		]);
+	}
+	
+	/**
+	 * Returns the path to the family's CSS file.
+	 * 
+	 * @return	string
+	 */
+	public function getCssFilename($family) {
+		return WCF_DIR.'font/families/'.$family.'/font.css';
+	}
+	
+	/**
+	 * Returns whether the family's CSS file exists, implying that
+	 * the family is available.
+	 * 
+	 * @return	boolean
+	 */
+	public function isFamilyDownloaded($family) {
+		return is_readable($this->getCssFilename($family));
+	}
+	
+	/**
+	 * Fetch the list of available families and returns it as an array.
+	 * 
+	 * @return	string[]
+	 */
+	public function fetchAvailableFamilies() {
+		$response = $this->http->send(new Request('GET', 'families.json'));
+		return JSON::decode($response->getBody());
+	}
+	
+	/**
+	 * Downloads the given font family, stores it in font/families/<family> and
+	 * returns the decoded font manifest.
+	 * 
+	 * @param	string	$family
+	 * @return	mixed[]
+	 */
+	public function downloadFamily($family) {
+		try {
+			$response = $this->http->send(new Request('GET', $family.'/manifest.json'));
+			$manifest = JSON::decode($response->getBody());
+			
+			$familyDirectory = dirname($this->getCssFilename($family));
+			FileUtil::makePath($familyDirectory);
+			
+			$css = $manifest['css'];
+			
+			foreach ($manifest['font_files'] as $filename) {
+				if ($filename !== basename($filename)) {
+					throw new \InvalidArgumentException("Invalid filename '".$filename."' given.");
+				}
+				
+				$response = $this->http->send(new Request('GET', $family.'/'.$filename));
+				
+				$file = new AtomicWriter($familyDirectory.'/'.$filename);
+				while (!$response->getBody()->eof()) {
+					$file->write($response->getBody()->read(4096));
+				}
+				$response->getBody()->close();
+				$file->flush();
+				$file->close();
+				
+				$css = str_replace('url("' . $filename . '")', 'url("../font/getFont.php?family='.rawurlencode($family).'&filename='.rawurlencode($filename).'")', $css);
+			}
+			
+			file_put_contents($this->getCssFilename($family), $css);
+			
+			return $manifest;
+		}
+		catch (ClientException $e) {
+			if ($e->getResponse()->getStatusCode() == 404) {
+				throw new FontDownloadFailed("Unable to download font family '".$family."'.", 'notFound', $e);
+			}
+			else {
+				throw new FontDownloadFailed("Unable to download font family '".$family."'.", '', $e);
+			}
+		}		
+		catch (RequestException $e) {
+			throw new FontDownloadFailed("Unable to download font family '".$family."'.", '', $e);
+		}
+	}
+}
diff --git a/wcfsetup/install/files/lib/system/style/exception/FontDownloadFailed.class.php b/wcfsetup/install/files/lib/system/style/exception/FontDownloadFailed.class.php
new file mode 100644
index 0000000000..0d9c6eedd8
--- /dev/null
+++ b/wcfsetup/install/files/lib/system/style/exception/FontDownloadFailed.class.php
@@ -0,0 +1,31 @@
+<?php
+namespace wcf\system\style\exception;
+
+/**
+ * Indicates that the font download failed.
+ * 
+ * @author	Tim Duesterhus
+ * @copyright	2001-2020 WoltLab GmbH
+ * @license	GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
+ * @package	WoltLabSuite\Core\System\Style
+ * @since	5.3
+ */
+class FontDownloadFailed extends \Exception {
+	/**
+	 * @var string
+	 */
+	private $reason = '';
+	
+	public function __construct($message, $reason = '', \Throwable $previous = null) {
+		parent::__construct($message, 0, $previous);
+		
+		$this->reason = $reason;
+	}
+	
+	/**
+	 * @return string
+	 */
+	public function getReason() {
+		return $this->reason;
+	}
+}
-- 
2.20.1