コンテンツ情報取得の実装をapi.phpから剥がした

app/MetadataResolver/Metadata.php

@@ -0,0 +1,10 @@
+<?php
+
+namespace App\MetadataResolver;
+
+class Metadata
+{
+    public $title = '';
+    public $description = '';
+    public $image = '';
+}

app/MetadataResolver/MetadataResolver.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace App\MetadataResolver;
+
+class MetadataResolver implements Resolver
+{
+    public $rules = [
+        '~(((sp\.)?seiga\.nicovideo\.jp/seiga(/#!)?|nico\.ms))/im~' => NicoSeigaResolver::class,
+        '~nijie\.info/view\.php~' => NijieResolver::class,
+        '/.*/' => OGPResolver::class
+    ];
+
+    public function resolve(string $url): Metadata
+    {
+        foreach ($this->rules as $pattern => $class) {
+            if (preg_match($pattern, $url) === 1) {
+                $resolver = new $class;
+                return $resolver->resolve($url);
+            }
+        }
+
+        throw new \UnexpectedValueException('URL not matched.');
+    }
+}

app/MetadataResolver/NicoSeigaResolver.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace App\MetadataResolver;
+
+class NicoSeigaResolver implements Resolver
+{
+    public function resolve(string $url): Metadata
+    {
+        $client = new \GuzzleHttp\Client();
+        $res = $client->get($url);
+        if ($res->getStatusCode() === 200) {
+            $ogpResolver = new OGPResolver();
+            $metadata = $ogpResolver->parse($res->getBody());
+
+            // ページURLからサムネイルURLに変換
+            preg_match('~http://(?:(?:sp\\.)?seiga\\.nicovideo\\.jp/seiga(?:/#!)?|nico\\.ms)/im(\\d+)~', $url, $matches);
+            $metadata->image = "http://lohas.nicoseiga.jp/thumb/${matches[1]}l?";
+
+            return $metadata;
+        } else {
+            throw new \RuntimeException("{$res->getStatusCode()}: $url");
+        }
+    }
+}

app/MetadataResolver/NijieResolver.php

@@ -0,0 +1,33 @@
+<?php
+
+namespace App\MetadataResolver;
+
+class NijieResolver implements Resolver
+{
+    public function resolve(string $url): Metadata
+    {
+        $client = new \GuzzleHttp\Client();
+        $res = $client->get($url);
+        if ($res->getStatusCode() === 200) {
+            $ogpResolver = new OGPResolver();
+            $metadata = $ogpResolver->parse($res->getBody());
+
+            $dom = new \DOMDocument();
+            @$dom->loadHTML(mb_convert_encoding($res->getBody(), 'HTML-ENTITIES', 'UTF-8'));
+            $xpath = new \DOMXPath($dom);
+            $dataNode = $xpath->query('//script[substring(@type, string-length(@type) - 3, 4) = "json"]');
+            foreach ($dataNode as $node) {
+                // 改行がそのまま入っていることがあるのでデコード前にエスケープが必要
+                $imageData = json_decode(preg_replace('/\r?\n/', '\n', $node->nodeValue), true);
+                if (isset($imageData['thumbnailUrl'])) {
+                    $metadata->image = preg_replace('~nijie\\.info/.*/nijie_picture/~', 'nijie.info/nijie_picture/', $imageData['thumbnailUrl']);
+                    break;
+                }
+            }
+
+            return $metadata;
+        } else {
+            throw new \RuntimeException("{$res->getStatusCode()}: $url");
+        }
+    }
+}

app/MetadataResolver/OGPResolver.php

@@ -0,0 +1,52 @@
+<?php
+
+namespace App\MetadataResolver;
+
+class OGPResolver implements Resolver
+{
+    public function resolve(string $url): Metadata
+    {
+        $client = new \GuzzleHttp\Client();
+        $res = $client->get($url);
+        if ($res->getStatusCode() === 200) {
+            return $this->parse($res->getBody());
+        } else {
+            throw new \RuntimeException("{$res->getStatusCode()}: $url");
+        }
+    }
+
+    public function parse(string $html): Metadata
+    {
+        $dom = new \DOMDocument();
+        @$dom->loadHTML(mb_convert_encoding($html, 'HTML-ENTITIES', 'UTF-8'));
+        $xpath = new \DOMXPath($dom);
+
+        $metadata = new Metadata();
+
+        $titleNode = $xpath->query('//meta[@*="og:title"]');
+        foreach ($titleNode as $node) {
+            if (!empty($node->getAttribute('content'))) {
+                $metadata->title = $node->getAttribute('content');
+                break;
+            }
+        }
+
+        $descriptionNode = $xpath->query('//meta[@*="og:description"]');
+        foreach ($descriptionNode as $node) {
+            if (!empty($node->getAttribute('content'))) {
+                $metadata->description = $node->getAttribute('content');
+                break;
+            }
+        }
+
+        $imageNode = $xpath->query('//meta[@*="og:image"]');
+        foreach ($imageNode as $node) {
+            if (!empty($node->getAttribute('content'))) {
+                $metadata->image = $node->getAttribute('content');
+                break;
+            }
+        }
+
+        return $metadata;
+    }
+}

app/MetadataResolver/Resolver.php

@@ -0,0 +1,8 @@
+<?php
+
+namespace App\MetadataResolver;
+
+interface Resolver
+{
+    public function resolve(string $url): Metadata;
+}

app/Providers/AppServiceProvider.php

@@ -2,6 +2,7 @@
 
 namespace App\Providers;
 
+use App\MetadataResolver\MetadataResolver;
 use Illuminate\Support\ServiceProvider;
 
 class AppServiceProvider extends ServiceProvider
@@ -23,6 +24,8 @@ class AppServiceProvider extends ServiceProvider
      */
     public function register()
     {
-        //
+        $this->app->singleton(MetadataResolver::class, function ($app) {
+            return new MetadataResolver();
+        });
     }
 }

routes/api.php

@@ -1,5 +1,6 @@
 <?php
 
+use App\MetadataResolver\MetadataResolver;
 use Illuminate\Http\Request;
 
 /*
@@ -17,75 +18,16 @@ Route::middleware('auth:api')->get('/user', function (Request $request) {
     return $request->user();
 });
 
-Route::get('/checkin/card', function (Request $request) {
+Route::get('/checkin/card', function (Request $request, MetadataResolver $resolver) {
     $request->validate([
         'url:required|url'
     ]);
     $url = $request->input('url');
 
-    $client = new GuzzleHttp\Client();
+    $metadata = $resolver->resolve($url);
-    $res = $client->get($url);
+    $response = response()->json($metadata);
-    if ($res->getStatusCode() === 200) {
+    if (!config('app.debug')) {
-        $dom = new DOMDocument();
+        $response = $response->setCache(['public' => true, 'max_age' => 86400]);
-        @$dom->loadHTML(mb_convert_encoding($res->getBody(), 'HTML-ENTITIES', 'UTF-8'));
-        $xpath = new DOMXPath($dom);
-
-        $result = [
-            'title' => '',
-            'description' => '',
-            'image' => ''
-        ];
-
-        $titleNode = $xpath->query('//meta[@*="og:title"]');
-        foreach ($titleNode as $node) {
-            if (!empty($node->getAttribute('content'))) {
-                $result['title'] = $node->getAttribute('content');
-                break;
-            }
-        }
-
-        $descriptionNode = $xpath->query('//meta[@*="og:description"]');
-        foreach ($descriptionNode as $node) {
-            if (!empty($node->getAttribute('content'))) {
-                $result['description'] = $node->getAttribute('content');
-                break;
-            }
-        }
-
-        $imageNode = $xpath->query('//meta[@*="og:image"]');
-        foreach ($imageNode as $node) {
-            if (!empty($node->getAttribute('content'))) {
-                $result['image'] = $node->getAttribute('content');
-                break;
-            }
-        }
-
-        // 一部サイトについては別のサムネイルの取得を試みる
-        if (mb_strpos($url, 'nico.ms/im') !== false ||
-            mb_strpos($url, 'seiga.nicovideo.jp/seiga/im') !== false ||
-            mb_strpos($url, 'sp.seiga.nicovideo.jp/seiga/#!/im') !== false) {
-            // ニコニコ静画用の処理
-            preg_match('~http://(?:(?:sp\\.)?seiga\\.nicovideo\\.jp/seiga(?:/#!)?|nico\\.ms)/im(\\d+)~', $url, $matches);
-            $result['image'] = "http://lohas.nicoseiga.jp/thumb/${matches[1]}l?";
-        } elseif (mb_strpos($url, 'nijie.info/view.php')) {
-            // ニジエ用の処理
-            $dataNode = $xpath->query('//script[substring(@type, string-length(@type) - 3, 4) = "json"]');
-            foreach ($dataNode as $node) {
-                // 改行がそのまま入っていることがあるのでデコード前にエスケープが必要
-                $imageData = json_decode(preg_replace('/\r?\n/', '\n', $node->nodeValue), true);
-                if (isset($imageData['thumbnailUrl'])) {
-                    $result['image'] = preg_replace('~nijie\\.info/.*/nijie_picture/~', 'nijie.info/nijie_picture/', $imageData['thumbnailUrl']);
-                    break;
-                }
-            }
-        }
-
-        $response = response()->json($result);
-        if (!config('app.debug')) {
-            $response = $response->setCache(['public' => true, 'max_age' => 86400]);
-        }
-        return $response;
-    } else {
-        abort($res->getStatusCode());
     }
+    return $response;
 });

tests/Unit/MetadataResolver/OGPResolverTest.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace Tests\Unit\MetadataResolver;
+
+use App\MetadataResolver\OGPResolver;
+use GuzzleHttp\Exception\ClientException;
+use Tests\TestCase;
+
+class OGPResolverTest extends TestCase
+{
+    public function testMissingUrl()
+    {
+        $resolver = new OGPResolver();
+
+        $this->expectException(ClientException::class);
+        $resolver->resolve('http://example.com/404');
+    }
+
+    public function testResolve()
+    {
+        $resolver = new OGPResolver();
+
+        $metadata = $resolver->resolve('http://ogp.me');
+        $this->assertEquals('Open Graph protocol', $metadata->title);
+        $this->assertEquals('The Open Graph protocol enables any web page to become a rich object in a social graph.', $metadata->description);
+        $this->assertEquals('http://ogp.me/logo.png', $metadata->image);
+    }
+}