initial commit

README.md

@@ -1,4 +1,6 @@
 CourseraDownloader
 ==================
 
-Download videos off Coursera without needing an account
+Download videos off Coursera without needing an account. 
+
+All you need is the /lecture/preview link. The script will crawl all lectures and save files with a standardized name.

grab.php

@@ -0,0 +1,52 @@
+<?php
+	/**
+	 * Super quick script to download Coursera videos.
+	 * 
+	 * You don't need to be logged in or anything silly like that,
+	 * just drop the /lecture/preview link in $page.
+	 * 
+	 * @author Jordan Skoblenick
+	 */
+
+	$page = 'https://class.coursera.org/neuralnets-2012-001/lecture/preview';
+
+	libxml_use_internal_errors(true);
+	$dom = new DOMDocument();
+	$dom->loadHTMLFile($page);
+	$xpath = new DOMXPath($dom);
+	$itemListNodes = $xpath->query('//div[contains(@class,"course-item-list")]');
+	if ($itemListNodes->length > 0) {
+		$itemList = $itemListNodes->item(0);
+		$headerNodes = $xpath->query('div[contains(@class,"course-item-list-header")]/h3', $itemList);
+		$listNodes = $xpath->query('ul[contains(@class,"course-item-list-section-list")]', $itemList);
+		if ($headerNodes->length == $listNodes->length) {
+			for ($i = 0; $i < $headerNodes->length; $i++) {
+				// remove unprintable shit, convert Lecture1 into Lecture 1
+				$header = preg_replace('/Lecture(\d)/', 'Lecture $1', trim(preg_replace('/[\x00-\x1F\x80-\xFF]/', '', $headerNodes->item($i)->nodeValue))) ;
+				$listItems = $xpath->query('li/a', $listNodes->item($i));
+				if ($listItems->length > 0) {
+					foreach ($listItems as $idx => $item) {
+						$videoTitle = trim(preg_replace('/([\[].*)$/', '', str_replace(array(':', '?'), '', $item->nodeValue)));
+						$videoLink = $item->getAttribute('data-modal-iframe');
+						$dom2 = new DOMDocument();
+						$dom2->loadHTMLFile($videoLink);
+						$xpath2 = new DOMXPath($dom2);
+						$videoNodes = $xpath2->query('//source[@type="video/mp4"]');
+						if ($videoNodes->length > 0) {
+							$fp = fopen(__DIR__.'/files/'.$header.' - E'.($idx+1).' - '.$videoTitle.'.mp4', 'w');
+							$ch = curl_init();
+							curl_setopt_array($ch, array(
+							    CURLOPT_FILE => $fp,
+							    CURLOPT_TIMEOUT => 28800, // set this to 8 hours so we dont timeout on big files
+							    CURLOPT_URL => $videoNodes->item(0)->getAttribute('src'),
+							    CURLOPT_SSL_VERIFYPEER => false
+							));
+							echo 'Downloading '.$header.' - E'.($idx+1).' - '.$videoTitle.'...'.PHP_EOL;
+							curl_exec($ch);
+						}
+					}
+				}
+			}
+		}
+	}
+?>