Finish implementing endpoint discovery for Webmentions

composer.json

@@ -18,6 +18,7 @@
     "require": {
         "symfony/dom-crawler": "^6.2",
         "symfony/css-selector": "^6.2",
-        "symfony/http-client": "^6.2"
+        "symfony/http-client": "^6.2",
+        "league/uri": "^6.8"
     }
 }

composer.lock

@@ -4,8 +4,179 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "d432732c93eebfe24b583d70e2f89661",
+    "content-hash": "352975aee49cdf2b7ee0c1f9a6ced635",
     "packages": [
+        {
+            "name": "league/uri",
+            "version": "6.8.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/thephpleague/uri.git",
+                "reference": "a700b4656e4c54371b799ac61e300ab25a2d1d39"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/thephpleague/uri/zipball/a700b4656e4c54371b799ac61e300ab25a2d1d39",
+                "reference": "a700b4656e4c54371b799ac61e300ab25a2d1d39",
+                "shasum": ""
+            },
+            "require": {
+                "ext-json": "*",
+                "league/uri-interfaces": "^2.3",
+                "php": "^8.1",
+                "psr/http-message": "^1.0.1"
+            },
+            "conflict": {
+                "league/uri-schemes": "^1.0"
+            },
+            "require-dev": {
+                "friendsofphp/php-cs-fixer": "^v3.9.5",
+                "nyholm/psr7": "^1.5.1",
+                "php-http/psr7-integration-tests": "^1.1.1",
+                "phpbench/phpbench": "^1.2.6",
+                "phpstan/phpstan": "^1.8.5",
+                "phpstan/phpstan-deprecation-rules": "^1.0",
+                "phpstan/phpstan-phpunit": "^1.1.1",
+                "phpstan/phpstan-strict-rules": "^1.4.3",
+                "phpunit/phpunit": "^9.5.24",
+                "psr/http-factory": "^1.0.1"
+            },
+            "suggest": {
+                "ext-fileinfo": "Needed to create Data URI from a filepath",
+                "ext-intl": "Needed to improve host validation",
+                "league/uri-components": "Needed to easily manipulate URI objects",
+                "psr/http-factory": "Needed to use the URI factory"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "6.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "League\\Uri\\": "src"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Ignace Nyamagana Butera",
+                    "email": "nyamsprod@gmail.com",
+                    "homepage": "https://nyamsprod.com"
+                }
+            ],
+            "description": "URI manipulation library",
+            "homepage": "https://uri.thephpleague.com",
+            "keywords": [
+                "data-uri",
+                "file-uri",
+                "ftp",
+                "hostname",
+                "http",
+                "https",
+                "middleware",
+                "parse_str",
+                "parse_url",
+                "psr-7",
+                "query-string",
+                "querystring",
+                "rfc3986",
+                "rfc3987",
+                "rfc6570",
+                "uri",
+                "uri-template",
+                "url",
+                "ws"
+            ],
+            "support": {
+                "docs": "https://uri.thephpleague.com",
+                "forum": "https://thephpleague.slack.com",
+                "issues": "https://github.com/thephpleague/uri/issues",
+                "source": "https://github.com/thephpleague/uri/tree/6.8.0"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sponsors/nyamsprod",
+                    "type": "github"
+                }
+            ],
+            "time": "2022-09-13T19:58:47+00:00"
+        },
+        {
+            "name": "league/uri-interfaces",
+            "version": "2.3.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/thephpleague/uri-interfaces.git",
+                "reference": "00e7e2943f76d8cb50c7dfdc2f6dee356e15e383"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/thephpleague/uri-interfaces/zipball/00e7e2943f76d8cb50c7dfdc2f6dee356e15e383",
+                "reference": "00e7e2943f76d8cb50c7dfdc2f6dee356e15e383",
+                "shasum": ""
+            },
+            "require": {
+                "ext-json": "*",
+                "php": "^7.2 || ^8.0"
+            },
+            "require-dev": {
+                "friendsofphp/php-cs-fixer": "^2.19",
+                "phpstan/phpstan": "^0.12.90",
+                "phpstan/phpstan-phpunit": "^0.12.19",
+                "phpstan/phpstan-strict-rules": "^0.12.9",
+                "phpunit/phpunit": "^8.5.15 || ^9.5"
+            },
+            "suggest": {
+                "ext-intl": "to use the IDNA feature",
+                "symfony/intl": "to use the IDNA feature via Symfony Polyfill"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "2.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "League\\Uri\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Ignace Nyamagana Butera",
+                    "email": "nyamsprod@gmail.com",
+                    "homepage": "https://nyamsprod.com"
+                }
+            ],
+            "description": "Common interface for URI representation",
+            "homepage": "http://github.com/thephpleague/uri-interfaces",
+            "keywords": [
+                "rfc3986",
+                "rfc3987",
+                "uri",
+                "url"
+            ],
+            "support": {
+                "issues": "https://github.com/thephpleague/uri-interfaces/issues",
+                "source": "https://github.com/thephpleague/uri-interfaces/tree/2.3.0"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sponsors/nyamsprod",
+                    "type": "github"
+                }
+            ],
+            "time": "2021-06-28T04:27:21+00:00"
+        },
         {
             "name": "masterminds/html5",
             "version": "2.7.6",
@@ -128,6 +299,59 @@
             },
             "time": "2021-11-05T16:47:00+00:00"
         },
+        {
+            "name": "psr/http-message",
+            "version": "1.0.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/php-fig/http-message.git",
+                "reference": "f6561bf28d520154e4b0ec72be95418abe6d9363"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/php-fig/http-message/zipball/f6561bf28d520154e4b0ec72be95418abe6d9363",
+                "reference": "f6561bf28d520154e4b0ec72be95418abe6d9363",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.0.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Psr\\Http\\Message\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "PHP-FIG",
+                    "homepage": "http://www.php-fig.org/"
+                }
+            ],
+            "description": "Common interface for HTTP messages",
+            "homepage": "https://github.com/php-fig/http-message",
+            "keywords": [
+                "http",
+                "http-message",
+                "psr",
+                "psr-7",
+                "request",
+                "response"
+            ],
+            "support": {
+                "source": "https://github.com/php-fig/http-message/tree/master"
+            },
+            "time": "2016-08-06T14:39:51+00:00"
+        },
         {
             "name": "psr/log",
             "version": "3.0.0",

src/EndpointParser.php

@@ -4,34 +4,60 @@ namespace Lewisdale\Webmentions;
 
 use Symfony\Contracts\HttpClient\ResponseInterface;
 use Symfony\Component\DomCrawler\Crawler;
+use League\Uri\Uri;
+use League\Uri\UriInfo;
+use League\Uri\UriResolver;
 
 class EndpointParser {
     public static function parse(ResponseInterface $response) : string | null
     {
+        $endpoint = self::parseHeaders($response) ?? self::parseBody($response);
+        return self::absoluteURL($response, $endpoint);
+    }
+
+    private static function parseHeaders(ResponseInterface $response) : string | null {
         $headers = $response->getHeaders();
-        $endpoint = null;
 
         if (isset($headers["link"])) {
-            $link = $headers["link"][0];
+            foreach($headers["link"] as $link) {
-            if (preg_match('/rel=("?)webmention("?)/', $link)) {
+                if (preg_match('/rel=("?)webmention("?)/', $link)) {
-                $matches = [];
+                    $matches = [];
-                preg_match('/\<(..*?)\>/', $link, $matches);
+                    preg_match('/\<(..*?)\>/', $link, $matches);
 
-                if (count($matches) > 1) {
+                    if (count($matches) > 1) {
-                    $endpoint = $matches[1];
+                        return $matches[1];
+                    }
                 }
-            }
+            }   
         }
 
+        return null;
+    }
+
+    private static function absoluteURL(ResponseInterface $response, ?string $endpoint) : string | null {
         if (!$endpoint) {
-            $doc = new Crawler($response->getContent());
+            return null;
-            $webmention = $doc->filter('rel="webmention"')->first();
         }
 
-        if ($endpoint && !str_contains($endpoint, "https://")) {
+        $url = $response->getInfo("redirect_url") ?? $response->getInfo('url');
-            $res = parse_url($response->getInfo('url'));
+        $uri = Uri::createFromString($url);
-            $endpoint = $res["scheme"] . "://" . $res["host"] . $endpoint;
+        $endpoint = Uri::createFromString($endpoint);
+
+        if (!UriInfo::isAbsolute($endpoint)) {
+            return (string) UriResolver::resolve($endpoint, $uri);
         }
-        return $endpoint;
+
+        return (string) $endpoint;
+    }
+
+    private static function parseBody(ResponseInterface $response) : string | null {
+        $doc = new Crawler($response->getContent());
+        $webmentions = $doc->filter('[rel="webmention"][href]');
+
+        if ($webmentions->count()) {
+            return $webmentions->first()->attr('href');
+        }
+
+        return null;
     }
 }

src/Webmention.php

@@ -2,7 +2,6 @@
 
 namespace Lewisdale\Webmentions;
 
-use DOMDocument;
 use Symfony\Component\DomCrawler\Crawler;
 use Symfony\Component\HttpClient\HttpClient;
 use Symfony\Contracts\HttpClient\HttpClientInterface;
@@ -22,14 +21,14 @@ class Webmention {
         //     $this->sendWebmention($source, $target);
         // }
 
-        $this->sendWebmention($source, "https://webmention.rocks/test/1");
+        $this->sendWebmention($source, "https://webmention.rocks/test/23/page");
     }
 
     private function getUrls(string $url) : array {
         $page = file_get_contents($url);
         $doc = new Crawler($page);
 
-                $urls = [];
+        $urls = [];
         foreach ($doc->filter('.h-entry a') as $anchor) {
             $target_url = $anchor->attributes->getNamedItem('href')->textContent;
 

tests/EndpointParserTest.php

@@ -4,7 +4,6 @@ use PHPUnit\Framework\TestCase;
 use Symfony\Contracts\HttpClient\ResponseInterface;
 use Lewisdale\Webmentions\EndpointParser;
 
-
 class EndpointParserTest extends TestCase {
     public function testParsesRelativeEndpointFromResponseHeaders() {
         $response = $this->createStub(ResponseInterface::class);
@@ -68,6 +67,49 @@ class EndpointParserTest extends TestCase {
             ->willReturn('https://webmention.rocks/test/4');
 
         $this->assertSame("https://webmention.rocks/test/4/webmention", EndpointParser::parse($response));
+    }
 
+    public function testSkipsParsingEndpointWithNoHref() {
+        $content = <<<XML
+        <html>
+            <head>
+                <link rel="webmention" />
+            </head>
+            <body>
+                <h1>Some content</h1>
+                <a href="/test/6/webmention" rel="webmention">The real webmention</a>
+            </body>
+        </html>
+        XML;
+
+        $response = $this->createStub(ResponseInterface::class);
+        $response->method('getHeaders')->willReturn([]);
+        $response->method('getContent')->willReturn($content);
+        $response->method('getInfo')
+            ->willReturn('https://webmention.rocks/test/6');
+
+        $this->assertSame("https://webmention.rocks/test/6/webmention", EndpointParser::parse($response));
+    }
+
+    public function testParseRelativeToPath() {
+        $content = <<<XML
+        <html>
+            <head>
+                <link rel="webmention" />
+            </head>
+            <body>
+                <h1>Some content</h1>
+                <a href="153/webmention" rel="webmention">The real webmention</a>
+            </body>
+        </html>
+        XML;
+
+        $response = $this->createStub(ResponseInterface::class);
+        $response->method('getHeaders')->willReturn([]);
+        $response->method('getContent')->willReturn($content);
+        $response->method('getInfo')
+            ->willReturn('https://webmention.rocks/test/153');
+
+        $this->assertSame("https://webmention.rocks/test/153/webmention", EndpointParser::parse($response));
     }
 }