From 5b9467ca92850a7d25074859ec4c4c6777d1530e Mon Sep 17 00:00:00 2001
From: Andrew Dolgov <noreply@fakecake.org>
Date: Thu, 15 Aug 2019 14:38:39 +0300
Subject: initial

---
 README.md | 15 ++++++++++
 init.php  | 95 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 110 insertions(+)
 create mode 100644 README.md
 create mode 100644 init.php

diff --git a/README.md b/README.md
new file mode 100644
index 0000000..0f5a992
--- /dev/null
+++ b/README.md
@@ -0,0 +1,15 @@
+## Fills missing posters of HTML5 video elements
+
+Requires ffmpeg to be usable. Using this in production is probably a terrible
+idea.
+
+As a side effect, both video stream and generated poster are cached locally.
+
+## Installation
+
+1. git clone to ``plugins.local/af_z_video_fill_poster``
+2. Enable plugin
+
+## License
+
+GPLv3
diff --git a/init.php b/init.php
new file mode 100644
index 0000000..6d713b7
--- /dev/null
+++ b/init.php
@@ -0,0 +1,95 @@
+<?php
+class Af_Z_Video_Fill_Poster extends Plugin {
+
+	/* @var PluginHost $host */
+	private $host;
+
+	/* @var DiskCache $cache */
+	private $cache;
+
+	function about() {
+		return array(1.0,
+			"Fills missing poster attributes of HTML5 video elements (uses ffmpeg)",
+			"fox");
+	}
+
+	function init($host) {
+		$this->host = $host;
+		$this->cache = new DiskCache("images");
+
+		$host->add_hook($host::HOOK_ARTICLE_FILTER, $this);
+	}
+
+	private function ffmpeg_thumbnail($input_filename, $output_filename) {
+		$cmdline_tpl = "ffmpeg -ss 00:00:01 -i %s -frames:v 1 ".
+			"-f singlejpeg %s 2>/dev/null";
+
+		$rc = -1;
+		$cmdline = sprintf($cmdline_tpl, escapeshellarg($input_filename), escapeshellarg($output_filename));
+
+		exec($cmdline, $output, $rc);;
+
+		return $rc === 0;
+	}
+
+	function hook_article_filter($article) {
+		$need_saving = false;
+		$doc = new DOMDocument();
+
+		if (@$doc->loadHTML('<?xml encoding="UTF-8">' . $article["content"])) {
+			$xpath = new DOMXPath($doc);
+			$videos = $xpath->query('(//video)');
+
+			foreach ($videos as $video) {
+				if (!$video->hasAttribute("poster")) {
+					$source = $xpath->query("//source[@src]", $video)->item(0);
+
+					if ($source) {
+						$video_url = $source->getAttribute("src");
+						$local_filename = sha1($video_url);
+						$thumb_filename = $local_filename . "-POSTER";
+
+						if ($this->cache->exists($thumb_filename)) {
+							$video->setAttribute("poster", $this->cache->getUrl($thumb_filename));
+							$need_saving = true;
+
+						} else {
+							if ($this->cache->exists($local_filename)) {
+								if ($this->ffmpeg_thumbnail(
+									$this->cache->getFullPath($local_filename),
+									$this->cache->getFullPath($thumb_filename))) {
+
+									$video->setAttribute("poster", $this->cache->getUrl($thumb_filename));
+									$need_saving = true;
+								}
+							} else {
+								$data = fetch_file_contents(["url" => $video_url, "max_size" => MAX_CACHE_FILE_SIZE]);
+
+								if ($data) {
+									if ($this->cache->put($local_filename, $data)) {
+										if ($this->ffmpeg_thumbnail(
+											$this->cache->getFullPath($local_filename),
+											$this->cache->getFullPath($thumb_filename))) {
+
+											$video->setAttribute("poster", $this->cache->getUrl($thumb_filename));
+											$need_saving = true;
+										}
+									}
+								}
+							}
+						}
+					}
+				}
+			}
+
+			if ($need_saving)
+				$article["content"] = $doc->saveHTML();
+		}
+
+		return $article;
+	}
+
+	function api_version() {
+		return 2;
+	}
+}
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