#24: Finished implementing the sitemap.xml creation logic

app/Http/Controllers/Gallery/DefaultController.php

@@ -7,6 +7,7 @@ use App\Facade\Theme;
 use App\Facade\UserConfig;
 use App\Helpers\DbHelper;
 use App\Http\Controllers\Controller;
+use App\Photo;
 use App\VisitorHit;
 use Illuminate\Http\Request;
 use Illuminate\Support\Facades\Auth;
@@ -42,19 +43,97 @@ class DefaultController extends Controller
         $xml->formatOutput = true;
 
         $root = $xml->createElementNS('http://www.sitemaps.org/schemas/sitemap/0.9', 'urlset');
+        $root->appendChild($xml->createAttribute('xmlns:image'))
+             ->appendChild($xml->createTextNode('http://www.google.com/schemas/sitemap-image/1.1'));
         $xml->appendChild($root);
 
-        // Root URL
+        // Root URL (get last modified photo to create the lastmod date for this URL)
-        $this->createSitemapNode($xml, $root, route('home'));
+        $lastModifiedPhoto = Photo::orderBy('updated_at', 'desc')->first();
+        $this->createSitemapNode($xml, $root, route('home'), (is_null($lastModifiedPhoto) ? '' : $lastModifiedPhoto->updated_at), '1.0');
+
+        // Add each album URL
+        $albums = Album::orderBy('name');
+        $albums->chunk(100, function($albumsChunk) use ($xml, $root)
+        {
+            /** @var Album $album */
+            foreach ($albumsChunk as $album)
+            {
+                $lastModifiedPhoto = Photo::where('album_id', $album->id)->orderBy('updated_at', 'desc')->first();
+                $this->createSitemapNode($xml, $root, $album->url(), (is_null($lastModifiedPhoto) ? $album->updated_at : $lastModifiedPhoto->updated_at), '0.9');
+            }
+        });
+
+        // Add each photo URL
+        $photos = Photo::orderBy('name');
+        $photos->chunk(100, function($tempPhotos) use ($xml, $root)
+        {
+            /** @var Photo $photo */
+            foreach ($tempPhotos as $photo)
+            {
+                $photoMeta = [$photo->name];
+                if (strlen($photo->description) > 0)
+                {
+                    $photoMeta[] = $photo->description;
+                }
+
+                $this->createSitemapNode(
+                    $xml,
+                    $root,
+                    $photo->url(),
+                    $photo->updated_at,
+                    '0.8',
+                    $photo->thumbnailUrl('fullsize', false),
+                    join(' - ', $photoMeta)
+                );
+            }
+        });
 
         return response($xml->saveXML(), 200, ['Content-Type' => 'text/xml']);
     }
 
-    private function createSitemapNode(\DOMDocument $document, \DOMElement $parentElement, $url)
+    private function createSitemapNode(
+        \DOMDocument $document,
+        \DOMElement $parentElement,
+        $url,
+        $lastModifiedDate = '',
+        $priority = '',
+        $imageUrl = '',
+        $imageCaption = ''
+    )
     {
         $urlElement = $document->createElement('url');
-        $urlLocElement = $document->createElement('loc', $url);
+
+        $urlLocElement = $document->createElement('loc', htmlentities($url));
         $urlElement->appendChild($urlLocElement);
+
+        $changeFreqElement = $document->createElement('changefreq', 'weekly');
+        $urlElement->appendChild($changeFreqElement);
+
+        if (strlen($lastModifiedDate) > 0)
+        {
+            $lastModElement = $document->createElement('lastmod', $lastModifiedDate);
+            $urlElement->appendChild($lastModElement);
+        }
+
+        if (strlen($priority) > 0)
+        {
+            $priorityElement = $document->createElement('priority', $priority);
+            $urlElement->appendChild($priorityElement);
+        }
+
+        if (strlen($imageUrl) > 0)
+        {
+            $imageElement = $document->createElement('image:image');
+
+            $imageLocElement = $document->createElement('image:loc', htmlentities($imageUrl));
+            $imageElement->appendChild($imageLocElement);
+
+            $imageCaptionElement = $document->createElement('image:caption', htmlentities($imageCaption));
+            $imageElement->appendChild($imageCaptionElement);
+
+            $urlElement->appendChild($imageElement);
+        }
+
         $parentElement->appendChild($urlElement);
 
         return $urlElement;