[DanbooruBridge] Fix bridge

This commit fixes an issue caused by self closing tags not supported
by simplehtmldom (<source>).

Adds a monkey patch to extend simplehtmldom with the ability to detect
that particular tag. Most of the code added is copied directly from
simplehtmldom (see vendor/simplehtmldom) with adjustments to account
for RSS-Bridge formatting.

Related to: https://sourceforge.net/p/simplehtmldom/bugs/83/

Notice: The tag itself is valid according to Mozilla:

The HTML <picture> element serves as a container for zero or more
<source> elements and one <img> element to provide versions of an
image for different display device scenarios. The browser will
consider each of the child <source> elements and select one
corresponding to the best match found; if no matches are found
among the <source> elements, the file specified by the <img>
element's src attribute is selected. The selected image is then
presented in the space occupied by the <img> element.

-- https://developer.mozilla.org/en-US/docs/Web/HTML/Element/picture

References #753

bridges/DanbooruBridge.php

@@ -1,7 +1,7 @@
 <?php
 class DanbooruBridge extends BridgeAbstract {
 
-	const MAINTAINER = 'mitsukarenai';
+	const MAINTAINER = 'mitsukarenai, logmanoriginal';
 	const NAME = 'Danbooru';
 	const URI = 'http://donmai.us/';
 	const CACHE_TIMEOUT = 1800; // 30min
@@ -57,11 +57,80 @@ class DanbooruBridge extends BridgeAbstract {
 	}
 
 	public function collectData(){
-		$html = getSimpleHTMLDOM($this->getFullURI())
+		$content = getContents($this->getFullURI())
 			or returnServerError('Could not request ' . $this->getName());
 
+		$html = Fix_Simple_Html_Dom::str_get_html($content);
+
 		foreach($html->find(static::PATHTODATA) as $element) {
 			$this->items[] = $this->getItemFromElement($element);
 		}
 	}
 }
+
+/**
+ * This class is a monkey patch to 'extend' simplehtmldom to recognize <source>
+ * tags (HTML5) as self closing tag. This patch should be removed once
+ * simplehtmldom was fixed. This seems to be a issue with more tags:
+ * https://sourceforge.net/p/simplehtmldom/bugs/83/
+ *
+ * The tag itself is valid according to Mozilla:
+ *
+ * The HTML <picture> element serves as a container for zero or more <source>
+ * elements and one <img> element to provide versions of an image for different
+ * display device scenarios. The browser will consider each of the child <source>
+ * elements and select one corresponding to the best match found; if no matches
+ * are found among the <source> elements, the file specified by the <img>
+ * element's src attribute is selected. The selected image is then presented in
+ * the space occupied by the <img> element.
+ *
+ * -- https://developer.mozilla.org/en-US/docs/Web/HTML/Element/picture
+ *
+ * Notice: This class uses parts of the original simplehtmldom, adjusted to pass
+ * the guidelines of RSS-Bridge (formatting)
+ */
+final class Fix_Simple_Html_Dom extends simple_html_dom {
+
+	/* copy from simple_html_dom, added 'source' at the end */
+	protected $self_closing_tags = array(
+		'img' => 1,
+		'br' => 1,
+		'input' => 1,
+		'meta' => 1,
+		'link' => 1,
+		'hr' => 1,
+		'base' => 1,
+		'embed' => 1,
+		'spacer' => 1,
+		'source' => 1
+	);
+
+	/* copy from simplehtmldom, changed 'simple_html_dom' to 'Fix_Simple_Html_Dom' */
+	public static function str_get_html($str,
+	$lowercase = true,
+	$forceTagsClosed = true,
+	$target_charset = DEFAULT_TARGET_CHARSET,
+	$stripRN = true,
+	$defaultBRText = DEFAULT_BR_TEXT,
+	$defaultSpanText = DEFAULT_SPAN_TEXT)
+	{
+		$dom = new Fix_Simple_Html_Dom(null,
+		$lowercase,
+		$forceTagsClosed,
+		$target_charset,
+		$stripRN,
+		$defaultBRText,
+		$defaultSpanText);
+
+		if (empty($str) || strlen($str) > MAX_FILE_SIZE) {
+
+			$dom->clear();
+			return false;
+
+		}
+
+		$dom->load($str, $lowercase, $stripRN);
+
+		return $dom;
+	}
+}