1 files changed, 89 insertions, 0 deletions
diff --git a/lib/private/Preview/TXT.php b/lib/private/Preview/TXT.php
new file mode 100644
index 00000000000..1a1d64f3e08
--- /dev/null
+++ b/lib/private/Preview/TXT.php
@@ -0,0 +1,89 @@
+<?php
+
+/**
+ * SPDX-FileCopyrightText: 2016-2024 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-FileCopyrightText: 2016 ownCloud, Inc.
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+namespace OC\Preview;
+
+use OCP\Files\File;
+use OCP\Files\FileInfo;
+use OCP\IImage;
+
+class TXT extends ProviderV2 {
+	/**
+	 * {@inheritDoc}
+	 */
+	public function getMimeType(): string {
+		return '/text\/plain/';
+	}
+
+	/**
+	 * {@inheritDoc}
+	 */
+	public function isAvailable(FileInfo $file): bool {
+		return $file->getSize() > 0;
+	}
+
+	/**
+	 * {@inheritDoc}
+	 */
+	public function getThumbnail(File $file, int $maxX, int $maxY): ?IImage {
+		if (!$this->isAvailable($file)) {
+			return null;
+		}
+
+		$content = $file->fopen('r');
+
+		if ($content === false) {
+			return null;
+		}
+
+		$content = stream_get_contents($content, 3000);
+
+		//don't create previews of empty text files
+		if (trim($content) === '') {
+			return null;
+		}
+
+		$lines = preg_split("/\r\n|\n|\r/", $content);
+
+		// Define text size of text file preview
+		$fontSize = $maxX ? (int)((1 / 32) * $maxX) : 5; //5px
+		$lineSize = ceil($fontSize * 1.5);
+
+		$image = imagecreate($maxX, $maxY);
+		imagecolorallocate($image, 255, 255, 255);
+		$textColor = imagecolorallocate($image, 0, 0, 0);
+
+		$fontFile = __DIR__;
+		$fontFile .= '/../../../core';
+		$fontFile .= '/fonts/NotoSans-Regular.ttf';
+
+		$canUseTTF = function_exists('imagettftext');
+
+		foreach ($lines as $index => $line) {
+			$index = $index + 1;
+
+			$x = 1;
+			$y = (int)($index * $lineSize);
+
+			if ($canUseTTF === true) {
+				imagettftext($image, $fontSize, 0, $x, $y, $textColor, $fontFile, $line);
+			} else {
+				$y -= $fontSize;
+				imagestring($image, 1, $x, $y, $line, $textColor);
+			}
+
+			if (($index * $lineSize) >= $maxY) {
+				break;
+			}
+		}
+
+		$imageObject = new \OCP\Image();
+		$imageObject->setResource($image);
+
+		return $imageObject->valid() ? $imageObject : null;
+	}
+}