hypeJunction / http-parser

src/hypeJunction/Parser.php

Doc Comments +1 added lines, -1 removed lines

@@ -339,7 +339,7 @@
 	 * Returns HTML contents of the page as a DOMDocument
 	 *
 	 * @param string $url URL of the resource
-	 * @return DOMDocument|false
+	 * @return DOMDocument
 	 */
 	public function getDOM($url = '') {
 		$html = $this->getHTML($url);

Spacing +1 added lines, -1 removed lines

@@ -297,7 +297,7 @@
 	public function isImage($url = '') {
 		$mime = $this->getContentType($url);
 		if ($mime) {
-			list($simple, ) = explode('/', $mime);
+			list($simple,) = explode('/', $mime);
 			return ($simple == 'image');
 		}
 

Indentation +564 added lines, -564 removed lines

@@ -12,569 +12,569 @@
  */
 class Parser {
 
-	/**
-	 * @var ClientInterface
-	 */
-	private $client;
-
-	/**
-	 * @var array
-	 */
-	private static $cache;
-
-	/**
-	 * @var array
-	 */
-	private $urls = [];
-
-	/**
-	 * Constructor
-	 * @param ClientInterface $client HTTP Client
-	 */
-	public function __construct(ClientInterface $client) {
-		$this->client = $client;
-	}
-
-	/**
-	 * Parses a URL into a an array of metatags
-	 *
-	 * @param string $url URL to parse
-	 * @return array
-	 */
-	public function parse($url = '') {
-		$data = $this->getImageData($url);
-		if (!$data) {
-			$data = $this->getOEmbedData($url);
-		}
-		if (!$data) {
-			$data = $this->getDOMData($url);
-			if (is_array($data) && !empty($data['oembed_url'])) {
-				foreach ($data['oembed_url'] as $oembed_url) {
-					$oembed_data = $this->getOEmbedData($oembed_url);
-					if (!empty($oembed_data) && is_array($oembed_data)) {
-						$oembed_data['oembed_url'] = $oembed_data['url'];
-						unset($oembed_data['url']);
-						$data = array_merge($data, $oembed_data);
-					}
-				}
-			}
-		}
-
-		if (!is_array($data)) {
-			$data = array();
-		}
-
-		if (empty($data['thumbnail_url']) && !empty($data['thumbnails'])) {
-			$data['thumbnail_url'] = $data['thumbnails'][0];
-		}
-
-		return $data;
-	}
-
-	/**
-	 * Parses image metatags
-	 *
-	 * @param string $url URL of the image
-	 * @return array|false
-	 */
-	public function getImageData($url = '') {
-		if (!$this->isImage($url)) {
-			return false;
-		}
-
-		return array(
-			'type' => 'photo',
-			'url' => $url,
-			'thumbnails' => array($url),
-		);
-	}
-
-	/**
-	 * Parses OEmbed data
-	 *
-	 * @param  string $url URL of the image
-	 * @return array|false
-	 */
-	public function getOEmbedData($url = '') {
-
-		if (!$this->isJSON($url) && !$this->isXML($url)) {
-			return false;
-		}
-
-		$meta = array(
-			'url' => $url,
-		);
-
-		$content = $this->read($url);
-		if (!$content) {
-			return $meta;
-		}
-
-		$data = new \stdClass();
-		if ($this->isJSON($url)) {
-			$data = json_decode($content);
-		} else if ($this->isXML($url)) {
-			$data = simplexml_load_string($content);
-		}
-
-		$props = array(
-			'type',
-			'version',
-			'title',
-			'author_name',
-			'author_url',
-			'provider_name',
-			'provider_url',
-			'cache_age',
-			'thumbnail_url',
-			'thumbnail_width',
-			'thumbnail_height',
-			'width',
-			'height',
-			'html',
-		);
-		foreach ($props as $key) {
-			if (!empty($data->$key)) {
-				$meta[$key] = (string) $data->$key;
-			}
-		}
-		return $meta;
-	}
-
-	/**
-	 * Parses metatags from DOM
-	 *
-	 * @param  string $url URL
-	 * @return array|false
-	 */
-	public function getDOMData($url = '') {
-
-		if (!$this->isHTML($url)) {
-			return false;
-		}
-
-		$doc = $this->getDOM($url);
-		if (!$doc) {
-			return false;
-		}
-
-		$defaults = array(
-			'url' => $url,
-		);
-
-		$link_tags = $this->parseLinkTags($doc);
-		$meta_tags = $this->parseMetaTags($doc);
-		$img_tags = $this->parseImgTags($doc);
-
-		$meta = array_merge_recursive($defaults, $link_tags, $meta_tags, $img_tags);
-
-		if (empty($meta['title'])) {
-			$meta['title'] = $this->parseTitle($doc);
-		}
-
-
-		return $meta;
-	}
-
-	/**
-	 * Check if URL exists and is reachable by making an HTTP request to retrieve header information
-	 *
-	 * @param string $url URL of the resource
-	 * @return boolean
-	 */
-	public function exists($url = '') {
-		$response = $this->request($url);
-		if ($response instanceof Response) {
-			return $response->getStatusCode() == 200;
-		}
-		return false;
-	}
-
-	/**
-	 * Validate URL
-	 *
-	 * @param string $url URL to validate
-	 * @return bool
-	 */
-	public function isValidUrl($url = '') {
-		// based on http://php.net/manual/en/function.filter-var.php#104160
-		// adapted by @mrclay in https://github.com/mrclay/Elgg-leaf/blob/62bf31c0ccdaab549a7e585a4412443e09821db3/engine/lib/output.php
-		$res = filter_var($url, FILTER_VALIDATE_URL);
-		if ($res) {
-			return $res;
-		}
-		// Check if it has unicode chars.
-		$l = mb_strlen($url);
-		if (strlen($url) == $l) {
-			return $res;
-		}
-		// Replace wide chars by “X”.
-		$s = '';
-		for ($i = 0; $i < $l; ++$i) {
-			$ch = elgg_substr($url, $i, 1);
-			$s .= (strlen($ch) > 1) ? 'X' : $ch;
-		}
-		// Re-check now.
-		return filter_var($s, FILTER_VALIDATE_URL) ? $url : false;
-	}
-
-	/**
-	 * Returns head of the resource
-	 *
-	 * @param string $url URL of the resource
-	 * @return Response|false
-	 */
-	public function request($url = '') {
-		$url = str_replace(' ', '%20', $url);
-		if (!$this->isValidUrl($url)) {
-			return false;
-		}
-		if (!isset(self::$cache[$url])) {
-			try {
-				$response = $this->client->request('GET', $url);
-			} catch (Exception $e) {
-				$response = false;
-				error_log("Parser Error for HEAD request ($url): {$e->getMessage()}");
-			}
-			self::$cache[$url] = $response;
-		}
-
-		return self::$cache[$url];
-	}
-
-	/**
-	 * Get contents of the page
-	 *
-	 * @param string $url URL of the resource
-	 * @return string
-	 */
-	public function read($url = '') {
-		$body = '';
-		if (!$this->exists($url)) {
-			return $body;
-		}
-
-		$response = $this->request($url);
-		$body = (string) $response->getBody();
-		return $body;
-	}
-
-	/**
-	 * Checks if resource is an html page
-	 *
-	 * @param string $url URL of the resource
-	 * @return boolean
-	 */
-	public function isHTML($url = '') {
-		$mime = $this->getContentType($url);
-		return strpos($mime, 'text/html') !== false;
-	}
-
-	/**
-	 * Checks if resource is JSON
-	 *
-	 * @param string $url URL of the resource
-	 * @return boolean
-	 */
-	public function isJSON($url = '') {
-		$mime = $this->getContentType($url);
-		return strpos($mime, 'json') !== false;
-	}
-
-	/**
-	 * Checks if resource is XML
-	 *
-	 * @param string $url URL of the resource
-	 * @return boolean
-	 */
-	public function isXML($url = '') {
-		$mime = $this->getContentType($url);
-		return strpos($mime, 'xml') !== false;
-	}
-
-	/**
-	 * Checks if resource is an image
-	 *
-	 * @param string $url URL of the resource
-	 * @return boolean
-	 */
-	public function isImage($url = '') {
-		$mime = $this->getContentType($url);
-		if ($mime) {
-			list($simple, ) = explode('/', $mime);
-			return ($simple == 'image');
-		}
-
-		return false;
-	}
-
-	/**
-	 * Get mime type of the URL content
-	 *
-	 * @param string $url URL of the resource
-	 * @return string
-	 */
-	public function getContentType($url = '') {
-		$response = $this->request($url);
-		if ($response instanceof Response) {
-			$header = $response->getHeader('Content-Type');
-			if (is_array($header) && !empty($header)) {
-				$parts = explode(';', $header[0]);
-				return trim($parts[0]);
-			}
-		}
-		return '';
-	}
-
-	/**
-	 * Returns HTML contents of the page
-	 *
-	 * @param string $url URL of the resource
-	 * @return string
-	 */
-	public function getHTML($url = '') {
-		if (!$this->isHTML($url)) {
-			return '';
-		}
-		return $this->read($url);
-	}
-
-	/**
-	 * Returns HTML contents of the page as a DOMDocument
-	 *
-	 * @param string $url URL of the resource
-	 * @return DOMDocument|false
-	 */
-	public function getDOM($url = '') {
-		$html = $this->getHTML($url);
-		if (empty($html)) {
-			return false;
-		}
-		$doc = new DOMDocument();
-
-		libxml_use_internal_errors(true);
-
-		if (is_callable('mb_convert_encoding')) {
-			$doc->loadHTML(mb_convert_encoding($html, 'HTML-ENTITIES', 'UTF-8'));
-		} else {
-			$doc->loadHTML($html);
-		}
-		if (!$doc->documentURI) {
-			$doc->documentURI = $url;
-		}
-
-		libxml_clear_errors();
-
-		return $doc;
-	}
-
-	/**
-	 * Parses document title
-	 *
-	 * @param DOMDocument $doc Document
-	 * @return string
-	 */
-	public function parseTitle(DOMDocument $doc) {
-		$node = $doc->getElementsByTagName('title');
-		$title = $node->item(0)->nodeValue;
-		return ($title) ?: '';
-	}
-
-	/**
-	 * Parses <link> tags
-	 *
-	 * @param DOMDocument $doc Document
-	 * @return array
-	 */
-	public function parseLinkTags(DOMDocument $doc) {
-
-		$meta = array(
-			'icons' => [],
-			'thumbnails' => [],
-		);
-
-		$nodes = $doc->getElementsByTagName('link');
-		foreach ($nodes as $node) {
-			$rel = $node->getAttribute('rel');
-			$href = $node->getAttribute('href');
-
-			switch ($rel) {
-
-				case 'icon' :
-					$image_url = $this->getAbsoluteURL($doc, $href);
-					if ($this->isImage($image_url)) {
-						$meta['icons'][] = $image_url;
-					}
-					break;
-
-				case 'canonical' :
-					$meta['canonical'] = $this->getAbsoluteURL($doc, $href);
-					break;
-
-				case 'alternate' :
-					$type = $node->getAttribute('type');
-					if (in_array($type, array(
-						'application/json+oembed',
-						'text/json+oembed',
-						'application/xml+oembed',
-						'text/xml+oembed'
-					))) {
-						$meta['oembed_url'][] = $this->getAbsoluteURL($doc, $href);
-					}
-					break;
-			}
-		}
-
-		return $meta;
-	}
-
-	/**
-	 * Parses <meta> tags
-	 *
-	 * @param DOMDocument $doc Document
-	 * @return array
-	 */
-	public function parseMetaTags(DOMDocument $doc) {
-
-		$meta = array();
-
-		$nodes = $doc->getElementsByTagName('meta');
-		if (!empty($nodes)) {
-			foreach ($nodes as $node) {
-				$name = $node->getAttribute('name');
-				if (!$name) {
-					$name = $node->getAttribute('property');
-				}
-				if (!$name) {
-					continue;
-				}
-
-				$name = strtolower($name);
-
-				if ($name == 'og:image:url' || $name == 'og:image:secure_url') {
-					$name = 'og:image';
-				}
-
-				$content = $node->getAttribute('content');
-				if (isset($meta['metatags'][$name])) {
-					if (!is_array($meta['metatags'][$name])) {
-						$meta['metatags'][$name] = array($meta['metatags'][$name]);
-					}
-					$meta['metatags'][$name][] = $content;
-				} else {
-					$meta['metatags'][$name] = $content;
-				}
-
-				switch ($name) {
-
-					case 'title' :
-					case 'og:title' :
-					case 'twitter:title' :
-						if (empty($meta['title'])) {
-							$meta['title'] = $content;
-						}
-						break;
-
-					case 'og:type' :
-						if (empty($meta['type'])) {
-							$meta['type'] = $content;
-						}
-						break;
-
-					case 'description' :
-					case 'og:description' :
-					case 'twitter:description' :
-						if (empty($meta['description'])) {
-							$meta['description'] = $content;
-						}
-						break;
-
-					case 'keywords' :
-						if (is_string($content)) {
-							$content = explode(',', $content);
-							$content = array_map('trim', $content);
-						}
-						$meta['tags'] = $content;
-						break;
-
-					case 'og:site_name' :
-					case 'twitter:site' :
-						if (empty($meta['provider_name'])) {
-							$meta['provider_name'] = $content;
-						}
-						break;
-
-					case 'og:image' :
-					case 'twitter:image' :
-						$image_url = $this->getAbsoluteURL($doc, $content);
-						if ($this->isImage($image_url)) {
-							$meta['thumbnails'][] = $image_url;
-						}
-						break;
-				}
-			}
-		}
-
-		return $meta;
-	}
-
-	/**
-	 * Parses <img> tags
-	 *
-	 * @param DOMDocument $doc Document
-	 * @return array
-	 */
-	public function parseImgTags(DOMDocument $doc) {
-
-		$meta = array(
-			'thumbnails' => [],
-		);
-
-		$nodes = $doc->getElementsByTagName('img');
-		foreach ($nodes as $node) {
-			$src = $node->getAttribute('src');
-			$image_url = $this->getAbsoluteURL($doc, $src);
-			if ($this->isImage($image_url)) {
-				$meta['thumbnails'][] = $image_url;
-			}
-		}
-
-		return $meta;
-	}
-
-	/**
-	 * Normalizes relative URLs
-	 *
-	 * @param DOMDocument $doc  Document
-	 * @param string      $href URL to normalize
-	 * @return string|false
-	 */
-	public function getAbsoluteURL(DOMDocument $doc, $href = '') {
-
-		if (preg_match("/^data:/i", $href)) {
-			// data URIs can not be resolved
-			return false;
-		}
-
-		// Check if $url is absolute
-		if (parse_url($href, PHP_URL_HOST)) {
-			return $href;
-		}
-
-		$uri = trim($doc->documentURI ?: '', '/');
-
-		$scheme = parse_url($uri, PHP_URL_SCHEME);
-		$host = parse_url($uri, PHP_URL_HOST);
-
-		if (substr($href, 0, 1) === "/") {
-			// URL is relative to site root
-			return "$scheme://$host$href";
-		}
-
-		// URL is relative to page
-		$path = parse_url($uri, PHP_URL_PATH);
-
-		return "$scheme://$host$path/$href";
-	}
+    /**
+     * @var ClientInterface
+     */
+    private $client;
+
+    /**
+     * @var array
+     */
+    private static $cache;
+
+    /**
+     * @var array
+     */
+    private $urls = [];
+
+    /**
+     * Constructor
+     * @param ClientInterface $client HTTP Client
+     */
+    public function __construct(ClientInterface $client) {
+        $this->client = $client;
+    }
+
+    /**
+     * Parses a URL into a an array of metatags
+     *
+     * @param string $url URL to parse
+     * @return array
+     */
+    public function parse($url = '') {
+        $data = $this->getImageData($url);
+        if (!$data) {
+            $data = $this->getOEmbedData($url);
+        }
+        if (!$data) {
+            $data = $this->getDOMData($url);
+            if (is_array($data) && !empty($data['oembed_url'])) {
+                foreach ($data['oembed_url'] as $oembed_url) {
+                    $oembed_data = $this->getOEmbedData($oembed_url);
+                    if (!empty($oembed_data) && is_array($oembed_data)) {
+                        $oembed_data['oembed_url'] = $oembed_data['url'];
+                        unset($oembed_data['url']);
+                        $data = array_merge($data, $oembed_data);
+                    }
+                }
+            }
+        }
+
+        if (!is_array($data)) {
+            $data = array();
+        }
+
+        if (empty($data['thumbnail_url']) && !empty($data['thumbnails'])) {
+            $data['thumbnail_url'] = $data['thumbnails'][0];
+        }
+
+        return $data;
+    }
+
+    /**
+     * Parses image metatags
+     *
+     * @param string $url URL of the image
+     * @return array|false
+     */
+    public function getImageData($url = '') {
+        if (!$this->isImage($url)) {
+            return false;
+        }
+
+        return array(
+            'type' => 'photo',
+            'url' => $url,
+            'thumbnails' => array($url),
+        );
+    }
+
+    /**
+     * Parses OEmbed data
+     *
+     * @param  string $url URL of the image
+     * @return array|false
+     */
+    public function getOEmbedData($url = '') {
+
+        if (!$this->isJSON($url) && !$this->isXML($url)) {
+            return false;
+        }
+
+        $meta = array(
+            'url' => $url,
+        );
+
+        $content = $this->read($url);
+        if (!$content) {
+            return $meta;
+        }
+
+        $data = new \stdClass();
+        if ($this->isJSON($url)) {
+            $data = json_decode($content);
+        } else if ($this->isXML($url)) {
+            $data = simplexml_load_string($content);
+        }
+
+        $props = array(
+            'type',
+            'version',
+            'title',
+            'author_name',
+            'author_url',
+            'provider_name',
+            'provider_url',
+            'cache_age',
+            'thumbnail_url',
+            'thumbnail_width',
+            'thumbnail_height',
+            'width',
+            'height',
+            'html',
+        );
+        foreach ($props as $key) {
+            if (!empty($data->$key)) {
+                $meta[$key] = (string) $data->$key;
+            }
+        }
+        return $meta;
+    }
+
+    /**
+     * Parses metatags from DOM
+     *
+     * @param  string $url URL
+     * @return array|false
+     */
+    public function getDOMData($url = '') {
+
+        if (!$this->isHTML($url)) {
+            return false;
+        }
+
+        $doc = $this->getDOM($url);
+        if (!$doc) {
+            return false;
+        }
+
+        $defaults = array(
+            'url' => $url,
+        );
+
+        $link_tags = $this->parseLinkTags($doc);
+        $meta_tags = $this->parseMetaTags($doc);
+        $img_tags = $this->parseImgTags($doc);
+
+        $meta = array_merge_recursive($defaults, $link_tags, $meta_tags, $img_tags);
+
+        if (empty($meta['title'])) {
+            $meta['title'] = $this->parseTitle($doc);
+        }
+
+
+        return $meta;
+    }
+
+    /**
+     * Check if URL exists and is reachable by making an HTTP request to retrieve header information
+     *
+     * @param string $url URL of the resource
+     * @return boolean
+     */
+    public function exists($url = '') {
+        $response = $this->request($url);
+        if ($response instanceof Response) {
+            return $response->getStatusCode() == 200;
+        }
+        return false;
+    }
+
+    /**
+     * Validate URL
+     *
+     * @param string $url URL to validate
+     * @return bool
+     */
+    public function isValidUrl($url = '') {
+        // based on http://php.net/manual/en/function.filter-var.php#104160
+        // adapted by @mrclay in https://github.com/mrclay/Elgg-leaf/blob/62bf31c0ccdaab549a7e585a4412443e09821db3/engine/lib/output.php
+        $res = filter_var($url, FILTER_VALIDATE_URL);
+        if ($res) {
+            return $res;
+        }
+        // Check if it has unicode chars.
+        $l = mb_strlen($url);
+        if (strlen($url) == $l) {
+            return $res;
+        }
+        // Replace wide chars by “X”.
+        $s = '';
+        for ($i = 0; $i < $l; ++$i) {
+            $ch = elgg_substr($url, $i, 1);
+            $s .= (strlen($ch) > 1) ? 'X' : $ch;
+        }
+        // Re-check now.
+        return filter_var($s, FILTER_VALIDATE_URL) ? $url : false;
+    }
+
+    /**
+     * Returns head of the resource
+     *
+     * @param string $url URL of the resource
+     * @return Response|false
+     */
+    public function request($url = '') {
+        $url = str_replace(' ', '%20', $url);
+        if (!$this->isValidUrl($url)) {
+            return false;
+        }
+        if (!isset(self::$cache[$url])) {
+            try {
+                $response = $this->client->request('GET', $url);
+            } catch (Exception $e) {
+                $response = false;
+                error_log("Parser Error for HEAD request ($url): {$e->getMessage()}");
+            }
+            self::$cache[$url] = $response;
+        }
+
+        return self::$cache[$url];
+    }
+
+    /**
+     * Get contents of the page
+     *
+     * @param string $url URL of the resource
+     * @return string
+     */
+    public function read($url = '') {
+        $body = '';
+        if (!$this->exists($url)) {
+            return $body;
+        }
+
+        $response = $this->request($url);
+        $body = (string) $response->getBody();
+        return $body;
+    }
+
+    /**
+     * Checks if resource is an html page
+     *
+     * @param string $url URL of the resource
+     * @return boolean
+     */
+    public function isHTML($url = '') {
+        $mime = $this->getContentType($url);
+        return strpos($mime, 'text/html') !== false;
+    }
+
+    /**
+     * Checks if resource is JSON
+     *
+     * @param string $url URL of the resource
+     * @return boolean
+     */
+    public function isJSON($url = '') {
+        $mime = $this->getContentType($url);
+        return strpos($mime, 'json') !== false;
+    }
+
+    /**
+     * Checks if resource is XML
+     *
+     * @param string $url URL of the resource
+     * @return boolean
+     */
+    public function isXML($url = '') {
+        $mime = $this->getContentType($url);
+        return strpos($mime, 'xml') !== false;
+    }
+
+    /**
+     * Checks if resource is an image
+     *
+     * @param string $url URL of the resource
+     * @return boolean
+     */
+    public function isImage($url = '') {
+        $mime = $this->getContentType($url);
+        if ($mime) {
+            list($simple, ) = explode('/', $mime);
+            return ($simple == 'image');
+        }
+
+        return false;
+    }
+
+    /**
+     * Get mime type of the URL content
+     *
+     * @param string $url URL of the resource
+     * @return string
+     */
+    public function getContentType($url = '') {
+        $response = $this->request($url);
+        if ($response instanceof Response) {
+            $header = $response->getHeader('Content-Type');
+            if (is_array($header) && !empty($header)) {
+                $parts = explode(';', $header[0]);
+                return trim($parts[0]);
+            }
+        }
+        return '';
+    }
+
+    /**
+     * Returns HTML contents of the page
+     *
+     * @param string $url URL of the resource
+     * @return string
+     */
+    public function getHTML($url = '') {
+        if (!$this->isHTML($url)) {
+            return '';
+        }
+        return $this->read($url);
+    }
+
+    /**
+     * Returns HTML contents of the page as a DOMDocument
+     *
+     * @param string $url URL of the resource
+     * @return DOMDocument|false
+     */
+    public function getDOM($url = '') {
+        $html = $this->getHTML($url);
+        if (empty($html)) {
+            return false;
+        }
+        $doc = new DOMDocument();
+
+        libxml_use_internal_errors(true);
+
+        if (is_callable('mb_convert_encoding')) {
+            $doc->loadHTML(mb_convert_encoding($html, 'HTML-ENTITIES', 'UTF-8'));
+        } else {
+            $doc->loadHTML($html);
+        }
+        if (!$doc->documentURI) {
+            $doc->documentURI = $url;
+        }
+
+        libxml_clear_errors();
+
+        return $doc;
+    }
+
+    /**
+     * Parses document title
+     *
+     * @param DOMDocument $doc Document
+     * @return string
+     */
+    public function parseTitle(DOMDocument $doc) {
+        $node = $doc->getElementsByTagName('title');
+        $title = $node->item(0)->nodeValue;
+        return ($title) ?: '';
+    }
+
+    /**
+     * Parses <link> tags
+     *
+     * @param DOMDocument $doc Document
+     * @return array
+     */
+    public function parseLinkTags(DOMDocument $doc) {
+
+        $meta = array(
+            'icons' => [],
+            'thumbnails' => [],
+        );
+
+        $nodes = $doc->getElementsByTagName('link');
+        foreach ($nodes as $node) {
+            $rel = $node->getAttribute('rel');
+            $href = $node->getAttribute('href');
+
+            switch ($rel) {
+
+                case 'icon' :
+                    $image_url = $this->getAbsoluteURL($doc, $href);
+                    if ($this->isImage($image_url)) {
+                        $meta['icons'][] = $image_url;
+                    }
+                    break;
+
+                case 'canonical' :
+                    $meta['canonical'] = $this->getAbsoluteURL($doc, $href);
+                    break;
+
+                case 'alternate' :
+                    $type = $node->getAttribute('type');
+                    if (in_array($type, array(
+                        'application/json+oembed',
+                        'text/json+oembed',
+                        'application/xml+oembed',
+                        'text/xml+oembed'
+                    ))) {
+                        $meta['oembed_url'][] = $this->getAbsoluteURL($doc, $href);
+                    }
+                    break;
+            }
+        }
+
+        return $meta;
+    }
+
+    /**
+     * Parses <meta> tags
+     *
+     * @param DOMDocument $doc Document
+     * @return array
+     */
+    public function parseMetaTags(DOMDocument $doc) {
+
+        $meta = array();
+
+        $nodes = $doc->getElementsByTagName('meta');
+        if (!empty($nodes)) {
+            foreach ($nodes as $node) {
+                $name = $node->getAttribute('name');
+                if (!$name) {
+                    $name = $node->getAttribute('property');
+                }
+                if (!$name) {
+                    continue;
+                }
+
+                $name = strtolower($name);
+
+                if ($name == 'og:image:url' || $name == 'og:image:secure_url') {
+                    $name = 'og:image';
+                }
+
+                $content = $node->getAttribute('content');
+                if (isset($meta['metatags'][$name])) {
+                    if (!is_array($meta['metatags'][$name])) {
+                        $meta['metatags'][$name] = array($meta['metatags'][$name]);
+                    }
+                    $meta['metatags'][$name][] = $content;
+                } else {
+                    $meta['metatags'][$name] = $content;
+                }
+
+                switch ($name) {
+
+                    case 'title' :
+                    case 'og:title' :
+                    case 'twitter:title' :
+                        if (empty($meta['title'])) {
+                            $meta['title'] = $content;
+                        }
+                        break;
+
+                    case 'og:type' :
+                        if (empty($meta['type'])) {
+                            $meta['type'] = $content;
+                        }
+                        break;
+
+                    case 'description' :
+                    case 'og:description' :
+                    case 'twitter:description' :
+                        if (empty($meta['description'])) {
+                            $meta['description'] = $content;
+                        }
+                        break;
+
+                    case 'keywords' :
+                        if (is_string($content)) {
+                            $content = explode(',', $content);
+                            $content = array_map('trim', $content);
+                        }
+                        $meta['tags'] = $content;
+                        break;
+
+                    case 'og:site_name' :
+                    case 'twitter:site' :
+                        if (empty($meta['provider_name'])) {
+                            $meta['provider_name'] = $content;
+                        }
+                        break;
+
+                    case 'og:image' :
+                    case 'twitter:image' :
+                        $image_url = $this->getAbsoluteURL($doc, $content);
+                        if ($this->isImage($image_url)) {
+                            $meta['thumbnails'][] = $image_url;
+                        }
+                        break;
+                }
+            }
+        }
+
+        return $meta;
+    }
+
+    /**
+     * Parses <img> tags
+     *
+     * @param DOMDocument $doc Document
+     * @return array
+     */
+    public function parseImgTags(DOMDocument $doc) {
+
+        $meta = array(
+            'thumbnails' => [],
+        );
+
+        $nodes = $doc->getElementsByTagName('img');
+        foreach ($nodes as $node) {
+            $src = $node->getAttribute('src');
+            $image_url = $this->getAbsoluteURL($doc, $src);
+            if ($this->isImage($image_url)) {
+                $meta['thumbnails'][] = $image_url;
+            }
+        }
+
+        return $meta;
+    }
+
+    /**
+     * Normalizes relative URLs
+     *
+     * @param DOMDocument $doc  Document
+     * @param string      $href URL to normalize
+     * @return string|false
+     */
+    public function getAbsoluteURL(DOMDocument $doc, $href = '') {
+
+        if (preg_match("/^data:/i", $href)) {
+            // data URIs can not be resolved
+            return false;
+        }
+
+        // Check if $url is absolute
+        if (parse_url($href, PHP_URL_HOST)) {
+            return $href;
+        }
+
+        $uri = trim($doc->documentURI ?: '', '/');
+
+        $scheme = parse_url($uri, PHP_URL_SCHEME);
+        $host = parse_url($uri, PHP_URL_HOST);
+
+        if (substr($href, 0, 1) === "/") {
+            // URL is relative to site root
+            return "$scheme://$host$href";
+        }
+
+        // URL is relative to page
+        $path = parse_url($uri, PHP_URL_PATH);
+
+        return "$scheme://$host$path/$href";
+    }
 
 }
\ No newline at end of file