diff options
| author | bastei <bastei@users.noreply.github.com> | 2013-09-21 04:27:13 +0200 |
|---|---|---|
| committer | bastei <bastei@users.noreply.github.com> | 2013-09-21 04:27:13 +0200 |
| commit | ea8e552ccb6e7d3818b41df1914dccc62cb4b324 (patch) | |
| tree | 9f14e4480f716aed4046e84a1060b4e58a04164e /utility | |
| parent | d9f1aca951fb83d870d8abbcc30244441dd2a442 (diff) | |
ArticleEnhancer: Transform relative to absolute URLs
Diffstat (limited to 'utility')
| -rw-r--r-- | utility/articleenhancer/articleenhancer.php | 108 |
1 files changed, 103 insertions, 5 deletions
diff --git a/utility/articleenhancer/articleenhancer.php b/utility/articleenhancer/articleenhancer.php index e0d60d4c4..823ddcc18 100644 --- a/utility/articleenhancer/articleenhancer.php +++ b/utility/articleenhancer/articleenhancer.php @@ -56,6 +56,7 @@ abstract class ArticleEnhancer { public function enhance($item){ + foreach($this->regexXPathPair as $regex => $search) { if(preg_match($regex, $item->getUrl())) { @@ -71,6 +72,7 @@ abstract class ArticleEnhancer { $dom = new \DOMDocument(); @$dom->loadHTML($body); + $xpath = new \DOMXpath($dom); $xpathResult = $xpath->evaluate($search); @@ -78,6 +80,9 @@ abstract class ArticleEnhancer { if(!is_string($xpathResult)) { $xpathResult = $this->domToString($xpathResult); } + + // convert all relative to absolute URLs + $xpathResult = $this->substituteRelativeLinks($xpathResult, $item->getUrl()); $sanitizedResult = $this->purifier->purify($xpathResult); $item->setBody($sanitizedResult); @@ -89,10 +94,103 @@ abstract class ArticleEnhancer { /** + * Method which converts all relative "href" and "src" URLs of + * a HTML snippet with their absolute equivalent + * @param string $xmlString a HTML snippet as string with the relative URLs to be replaced + * @param string $absoluteUrl the approptiate absolute url of the HTML snippet + * @return string the result HTML snippet as a string + */ + protected function substituteRelativeLinks($xmlString, $absoluteUrl) { + $dom = new \DOMDocument(); + $dom->preserveWhiteSpace = false; + + // return, if xml is empty or loading the HTML fails + if( trim($xmlString) == "" || !$dom->loadHTML($xmlString) ) { + return $xmlString; + } + + // remove <!DOCTYPE + $dom->removeChild($dom->firstChild); + // remove <html></html> + $dom->replaceChild($dom->firstChild->firstChild, $dom->firstChild); + + $substitution = array("href", "src"); + + foreach ($substitution as $attribute) { + $xpath = new \DOMXpath($dom); + $xpathResult = $xpath->query("//*[@".$attribute." and not(contains(@".$attribute.", '://')) and not(starts-with(@".$attribute.", 'mailto:'))]"); + foreach ($xpathResult as $linkNode) { + $urlElement = $linkNode->attributes->getNamedItem($attribute); + $urlElement->nodeValue = $this->relativeToAbsoluteUrl( $urlElement->nodeValue, $absoluteUrl ); + } + } + + // save dom to string and remove <body></body> + $xmlString = substr(trim($dom->saveHTML()), 6, -7); + // domdocument spoils the string with line breaks between the elements. strip them. + $xmlString = str_replace("\n", "", $xmlString); + + return $xmlString; + } + + + /** + * Method which builds a URL by taking a relative URL and its corresponding + * absolute URL + * For examle relative URL "../example/path/file.php?a=1#anchor" and + * absolute URL "https://username:password@www.website.com/subfolder/index.html" + * will result in "https://username:password@www.website.com/example/path/file.php?a=1#anchor" + * @param string $relativeUrl the relative URL + * @param string $absoluteUrl the absolute URL with at least scheme and host + * @return string the resulting absolute URL + */ + protected function relativeToAbsoluteUrl($relativeUrl, $absoluteUrl) { + $abs = parse_url($absoluteUrl); + + $newUrl = $abs["scheme"]."://" + .( (isset($abs["user"])) ? $abs["user"] . ( (isset($abs["pass"])) ? ":".$abs["pass"] : "") . "@" : "" ) + .$abs["host"] + .( (isset($abs["port"])) ? ":".$abs["port"] : "" ); + + if(substr(trim($relativeUrl), 0, 1) == "/") { + // we have a relative url like "/a/path/file" + return $newUrl . $relativeUrl; + } else { + // we have a relative url like "a/path/file", handle "."" and ".." directories + + // the starting point is the absolute path, but with out the last part (we don't need the file name) + $newPath = explode("/", substr($abs["path"], 1) ); + array_pop($newPath); + + $relPath = parse_url($relativeUrl, PHP_URL_PATH); + $relPath = explode("/", $relPath); + + // cross the relative and the absolute path + for($i=0; $i<count($relPath)-1; $i++) { + if($relPath[$i] == ".") { + continue; + } elseif($relPath[$i] == "..") { + array_pop($newPath); + } else { + $newPath[] = $relPath[$i]; + } + } + + // add the last part (the file name) of the relative URL + $newPath[] = $relPath[ count($relPath)-1 ]; + $newPath = implode("/", $newPath); + + $rel = parse_url($relativeUrl); + return $newUrl . "/" . $newPath + . ( (isset($rel["query"])) ? "?".$rel["query"] : "") + . ( (isset($rel["fragment"])) ? "#".$rel["fragment"] : ""); + } + } + + + /** * Method which turns an xpath result to a string - * Assumes that the result matches a single element. If the result - * is not a single element, you can customize it by overwriting this - * method + * you can customize it by overwriting this method * @param $xpathResult the result from the xpath query * @return the result as a string */ @@ -106,9 +204,9 @@ abstract class ArticleEnhancer { protected function toInnerHTML($node) { - $dom = new \DOMDocument(); + $dom = new \DOMDocument(); $dom->appendChild($dom->importNode($node, true)); - return trim($dom->saveHTML()); + return trim($dom->saveHTML($dom->documentElement)); } |