Add new xpathQuote and checkRelMeLink methods to Content\Text\HTML class
- Add tests for both methods
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Hypolite Petovan
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@ -33,6 +33,7 @@ use Friendica\Util\Network;
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use Friendica\Util\Strings;
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use Friendica\Util\XML;
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use League\HTMLToMarkdown\HtmlConverter;
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use Psr\Http\Message\UriInterface;
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class HTML
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{
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@ -1007,4 +1008,51 @@ class HTML
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return $text;
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}
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/**
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* XPath arbitrary string quoting
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*
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* @see https://stackoverflow.com/a/45228168
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* @param string $value
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* @return string
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*/
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public static function xpathQuote(string $value): string
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{
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if (false === strpos($value, '"')) {
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return '"' . $value . '"';
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}
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if (false === strpos($value, "'")) {
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return "'" . $value . "'";
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}
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// if the value contains both single and double quotes, construct an
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// expression that concatenates all non-double-quote substrings with
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// the quotes, e.g.:
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//
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// concat("'foo'", '"', "bar")
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return 'concat(' . implode(', \'"\', ', array_map(['self', 'xpathQuote'], explode('"', $value))) . ')';
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}
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/**
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* Checks if the provided URL is present in the DOM document in an element with the rel="me" attribute
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*
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* XHTML Friends Network http://gmpg.org/xfn/
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*
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* @param DOMDocument $doc
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* @param UriInterface $meUrl
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* @return bool
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*/
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public static function checkRelMeLink(DOMDocument $doc, UriInterface $meUrl): bool
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{
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$xpath = new \DOMXpath($doc);
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// This expression checks that "me" is among the space-delimited values of the "rel" attribute.
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// And that the href attribute contains exactly the provided URL
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$expression = "//*[contains(concat(' ', normalize-space(@rel), ' '), ' me ')][@href = " . self::xpathQuote($meUrl) . "]";
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$result = $xpath->query($expression);
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return $result !== false && $result->length > 0;
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}
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}
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@ -0,0 +1,10 @@
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8" />
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<title>Remote page</title>
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</head>
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<body>
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<a href="https://example.com/profile/me" rel="nofollow me">My Profile</a>
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</body>
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</html>
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@ -0,0 +1,10 @@
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8" />
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<title>Remote page</title>
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</head>
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<body>
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<a href="https://example.com/profile/me" rel="noreferrer me nofollow">My Profile</a>
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</body>
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</html>
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@ -0,0 +1,10 @@
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8" />
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<title>Remote page</title>
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</head>
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<body>
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<a href="https://example.com/profile/me" rel="me nofollow">My Profile</a>
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</body>
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</html>
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@ -0,0 +1,10 @@
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8" />
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<title>Remote page</title>
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</head>
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<body>
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<a href="https://example.com/profile/me2" rel="me">My Profile</a>
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</body>
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</html>
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@ -0,0 +1,10 @@
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8" />
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<title>Remote page</title>
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</head>
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<body>
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<a href="https://example.com/profile/me" rel="me">My Profile</a>
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</body>
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</html>
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@ -0,0 +1,11 @@
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8" />
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<title>Remote page</title>
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<link href="https://example.com/profile/me" rel="media"/>
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</head>
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<body>
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</body>
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</html>
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@ -0,0 +1,11 @@
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8" />
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<title>Remote page</title>
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<link href="https://example.com/profile/me" rel="me"/>
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</head>
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<body>
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</body>
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</html>
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@ -25,6 +25,8 @@ use Exception;
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use Friendica\Content\Text\HTML;
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use Friendica\Network\HTTPException\InternalServerErrorException;
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use Friendica\Test\FixtureTest;
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use GuzzleHttp\Psr7\Uri;
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use Psr\Http\Message\UriInterface;
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class HTMLTest extends FixtureTest
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{
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@ -105,4 +107,152 @@ its surprisingly good",
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self::assertEquals($expectedBBCode, $actual);
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}
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public function dataXpathQuote(): array
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{
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return [
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'no quotes' => [
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'value' => "foo",
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],
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'double quotes only' => [
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'value' => "\"foo",
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],
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'single quotes only' => [
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'value' => "'foo",
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],
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'both; double quotes in mid-string' => [
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'value' => "'foo\"bar",
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],
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'multiple double quotes in mid-string' => [
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'value' => "'foo\"bar\"baz",
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],
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'string ends with double quotes' => [
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'value' => "'foo\"",
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],
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'string ends with run of double quotes' => [
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'value' => "'foo\"\"",
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],
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'string begins with double quotes' => [
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'value' => "\"'foo",
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],
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'string begins with run of double quotes' => [
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'value' => "\"\"'foo",
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],
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'run of double quotes in mid-string' => [
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'value' => "'foo\"\"bar",
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],
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];
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}
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/**
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* @dataProvider dataXpathQuote
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* @param string $value
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* @return void
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* @throws \DOMException
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*/
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public function testXpathQuote(string $value)
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{
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$dom = new \DOMDocument();
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$element = $dom->createElement('test');
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$attribute = $dom->createAttribute('value');
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$attribute->value = $value;
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$element->appendChild($attribute);
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$dom->appendChild($element);
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$xpath = new \DOMXPath($dom);
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$result = $xpath->query('//test[@value = ' . HTML::xpathQuote($value) . ']');
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$this->assertInstanceOf(\DOMNodeList::class, $result);
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$this->assertEquals(1, $result->length);
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}
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public function dataCheckRelMeLink(): array
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{
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$aSingleRelValue = new \DOMDocument();
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$aSingleRelValue->load(__DIR__ . '/../../../datasets/dom/relme/a-single-rel-value.html');
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$aMultipleRelValueStart = new \DOMDocument();
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$aMultipleRelValueStart->load(__DIR__ . '/../../../datasets/dom/relme/a-multiple-rel-value-start.html');
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$aMultipleRelValueMiddle = new \DOMDocument();
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$aMultipleRelValueMiddle->load(__DIR__ . '/../../../datasets/dom/relme/a-multiple-rel-value-middle.html');
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$aMultipleRelValueEnd = new \DOMDocument();
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$aMultipleRelValueEnd->load(__DIR__ . '/../../../datasets/dom/relme/a-multiple-rel-value-end.html');
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$linkSingleRelValue = new \DOMDocument();
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$linkSingleRelValue->load(__DIR__ . '/../../../datasets/dom/relme/link-single-rel-value.html');
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$meUrl = new Uri('https://example.com/profile/me');
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return [
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'a-single-rel-value' => [
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'doc' => $aSingleRelValue,
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'meUrl' => $meUrl
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],
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'a-multiple-rel-value-start' => [
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'doc' => $aMultipleRelValueStart,
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'meUrl' => $meUrl
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],
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'a-multiple-rel-value-middle' => [
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'doc' => $aMultipleRelValueMiddle,
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'meUrl' => $meUrl
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],
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'a-multiple-rel-value-end' => [
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'doc' => $aMultipleRelValueEnd,
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'meUrl' => $meUrl
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],
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'link-single-rel-value' => [
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'doc' => $linkSingleRelValue,
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'meUrl' => $meUrl
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],
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];
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}
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/**
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* @dataProvider dataCheckRelMeLink
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* @param \DOMDocument $doc
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* @param UriInterface $meUrl
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* @return void
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*/
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public function testCheckRelMeLink(\DOMDocument $doc, UriInterface $meUrl)
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{
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$this->assertTrue(HTML::checkRelMeLink($doc, $meUrl));
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}
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public function dataCheckRelMeLinkFail(): array
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{
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$aSingleRelValueFail = new \DOMDocument();
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$aSingleRelValueFail->load(__DIR__ . '/../../../datasets/dom/relme/a-single-rel-value-fail.html');
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$linkSingleRelValueFail = new \DOMDocument();
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$linkSingleRelValueFail->load(__DIR__ . '/../../../datasets/dom/relme/link-single-rel-value-fail.html');
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$meUrl = new Uri('https://example.com/profile/me');
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return [
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'a-single-rel-value-fail' => [
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'doc' => $aSingleRelValueFail,
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'meUrl' => $meUrl
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],
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'link-single-rel-value-fail' => [
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'doc' => $linkSingleRelValueFail,
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'meUrl' => $meUrl
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],
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];
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}
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/**
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* @dataProvider dataCheckRelMeLinkFail
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* @param \DOMDocument $doc
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* @param UriInterface $meUrl
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* @return void
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*/
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public function testCheckRelMeLinkFail(\DOMDocument $doc, UriInterface $meUrl)
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{
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$this->assertFalse(HTML::checkRelMeLink($doc, $meUrl));
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}
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}
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