Fixed webroot detection

Signed-off-by: John Molakvoæ (skjnldsv) <skjnldsv@protonmail.com>

apps/accessibility/css/themedark.scss

@@ -18,6 +18,7 @@ $color-border: lighten($color-main-background, 7%);
 $color-border-dark: lighten($color-main-background, 14%);
 
 #app-navigation > ul > li > a:first-child img,
-#app-navigation > ul > li > ul > li > a:first-child img {
+#app-navigation > ul > li > ul > li > a:first-child img,
+#expanddiv a img {
 	filter: invert(100%);
 }

apps/accessibility/lib/Controller/AccessibilityController.php

@@ -111,8 +111,9 @@ class AccessibilityController extends Controller {
 	public function getCss(): DataDisplayResponse {
 		$css     = '';
 		$imports = '';
+		$userValues = $this->getUserValues();
 
-		foreach ($this->getUserValues() as $key => $scssFile) {
+		foreach ($userValues as $key => $scssFile) {
 			if ($scssFile !== false) {
 				$imports .= '@import "' . $scssFile . '";';
 			}
@@ -144,6 +145,16 @@ class AccessibilityController extends Controller {
 		// We don't want to override vars with url since path is different
 		$css = $this->filterOutRule('/--[a-z-:]+url\([^;]+\)/mi', $css);
 
+		// Calculate exact absolute path to file
+		$path = $this->urlGenerator->linkToRoute($this->appName . '.accessibility.getCss', ['md5' => md5(implode('-', $userValues))]);
+		$path = explode('/', $this->serverRoot . $path);
+		array_pop($path);
+		$path = implode('/', $path);
+		$webDir = $this->getWebDir($path, $this->appName, $this->serverRoot, \OC::$WEBROOT);
+
+		// Rebase all urls
+		$css = $this->rebaseUrls($css, $webDir);
+
 		$response = new DataDisplayResponse($css, Http::STATUS_OK, ['Content-Type' => 'text/css']);
 
 		// Set cache control
@@ -158,15 +169,60 @@ class AccessibilityController extends Controller {
 		return $response;
 	}
 
-	private function getUserValues() {
+	/**
+	 * Return an array with the user theme & font settings
+	 *
+	 * @return array
+	 */
+	private function getUserValues(): array{
 		$userTheme = $this->config->getUserValue($this->userSession->getUser()->getUID(), $this->appName, 'theme', false);
 		$userFont  = $this->config->getUserValue($this->userSession->getUser()->getUID(), $this->appName, 'font', false);
 
 		return [$userTheme, $userFont];
 	}
 
-	private function filterOutRule(string $rule, string $css) {
+	/**
+	 * Remove all matches from the $rule regex
+	 *
+	 * @param string $rule regex to match
+	 * @param string $css string to parse
+	 * @return string
+	 */
+	private function filterOutRule(string $rule, string $css): string {
 		return preg_replace($rule, '', $css);
 	}
 
+	/**
+	 * Add the correct uri prefix to make uri valid again
+	 *
+	 * @param string $css
+	 * @param string $webDir
+	 * @return string
+	 */
+	private function rebaseUrls(string $css, string $webDir): string {
+		$re    = '/url\([\'"]([^\/][\.\w?=\/-]*)[\'"]\)/x';
+		$subst = 'url(\'' . $webDir . '/$1\')';
+
+		return preg_replace($re, $subst, $css);
+	}
+
+	/**
+	 * Get WebDir root
+	 * @param string $path the css file path
+	 * @param string $appName the app name
+	 * @param string $serverRoot the server root path
+	 * @param string $webRoot the nextcloud installation root path
+	 * @return string the webDir
+	 */
+	private function getWebDir(string $path, string $appName, string $serverRoot, string $webRoot): string {
+		// Detect if path is within server root AND if path is within an app path
+		if ( strpos($path, $serverRoot) === false && $appWebPath = \OC_App::getAppWebPath($appName)) {
+			// Get the file path within the app directory
+			$appDirectoryPath = explode($appName, $path)[1];
+			// Remove the webroot
+			return str_replace($webRoot, '', $appWebPath.$appDirectoryPath);
+		}
+		return $webRoot.substr($path, strlen($serverRoot));
+	}
+
 }