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app/Services/RSS/RSSFeedBuilder.php

@@ -0,0 +1,138 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Services\RSS;
+
+use Illuminate\Http\Response;
+use Illuminate\Support\Collection;
+
+/**
+ * RSSFeedBuilder
+ *
+ * Responsible for:
+ *  - normalising feed items from Eloquent collections
+ *  - enforcing feed limits (max 20 items)
+ *  - rendering RSS 2.0 XML via the rss.channel Blade template
+ *  - returning a properly typed HTTP Response
+ */
+final class RSSFeedBuilder
+{
+    /** Hard item limit per feed (spec §7). */
+    public const FEED_LIMIT = 20;
+
+    // ── Public builders ───────────────────────────────────────────────────────
+
+    /**
+     * Build an RSS 2.0 Response from an Artwork Eloquent collection.
+     * Artworks must have 'user' and 'categories' relations preloaded.
+     */
+    public function buildFromArtworks(
+        string     $channelTitle,
+        string     $channelDescription,
+        string     $feedUrl,
+        Collection $artworks,
+    ): Response {
+        $items = $artworks->take(self::FEED_LIMIT)->map(fn ($a) => $this->artworkToItem($a));
+
+        return $this->buildResponse($channelTitle, $channelDescription, url('/'), $feedUrl, $items);
+    }
+
+    /**
+     * Build an RSS 2.0 Response from a BlogPost Eloquent collection.
+     * Posts must have 'author' relation preloaded.
+     */
+    public function buildFromBlogPosts(
+        string     $channelTitle,
+        string     $channelDescription,
+        string     $feedUrl,
+        Collection $posts,
+    ): Response {
+        $items = $posts->take(self::FEED_LIMIT)->map(fn ($p) => $this->blogPostToItem($p));
+
+        return $this->buildResponse($channelTitle, $channelDescription, url('/blog'), $feedUrl, $items);
+    }
+
+    // ── Private helpers ───────────────────────────────────────────────────────
+
+    private function buildResponse(
+        string     $channelTitle,
+        string     $channelDescription,
+        string     $channelLink,
+        string     $feedUrl,
+        Collection $items,
+    ): Response {
+        $xml = view('rss.channel', [
+            'channelTitle'       => trim($channelTitle) . ' — Skinbase',
+            'channelDescription' => $channelDescription,
+            'channelLink'        => $channelLink,
+            'feedUrl'            => $feedUrl,
+            'items'              => $items,
+            'buildDate'          => now()->toRfc2822String(),
+        ])->render();
+
+        return response($xml, 200, [
+            'Content-Type'  => 'application/rss+xml; charset=utf-8',
+            'Cache-Control' => 'public, max-age=300',
+        ]);
+    }
+
+    /** Convert an Artwork model to an RSS item array. */
+    private function artworkToItem(object $artwork): array
+    {
+        $link  = url('/art/' . $artwork->id . '/' . ($artwork->slug ?? ''));
+        $thumb = method_exists($artwork, 'thumbUrl') ? $artwork->thumbUrl('sm') : null;
+
+        // Primary category from eagerly loaded relation (avoid N+1)
+        $primaryCategory = ($artwork->relationLoaded('categories'))
+            ? $artwork->categories->first()
+            : null;
+
+        // Build HTML description embedded in CDATA
+        $descParts = [];
+        if ($thumb) {
+            $descParts[] = '<img src="' . htmlspecialchars($thumb, ENT_XML1) . '" '
+                . 'alt="' . htmlspecialchars((string) $artwork->title, ENT_XML1) . '" />';
+        }
+        if (!empty($artwork->description)) {
+            $descParts[] = '<p>' . htmlspecialchars(strip_tags((string) $artwork->description), ENT_XML1) . '</p>';
+        }
+
+        return [
+            'title'       => (string) $artwork->title,
+            'link'        => $link,
+            'guid'        => $link,
+            'description' => implode('', $descParts),
+            'pubDate'     => $artwork->published_at?->toRfc2822String(),
+            'author'      => $artwork->user?->username ?? 'Unknown',
+            'category'    => $primaryCategory?->name,
+            'enclosure'   => $thumb ? [
+                'url'    => $thumb,
+                'length' => 0,
+                'type'   => 'image/jpeg',
+            ] : null,
+        ];
+    }
+
+    /** Convert a BlogPost model to an RSS item array. */
+    private function blogPostToItem(object $post): array
+    {
+        $link    = url('/blog/' . $post->slug);
+        $excerpt = $post->excerpt ?? strip_tags((string) ($post->body ?? ''));
+
+        return [
+            'title'       => (string) $post->title,
+            'link'        => $link,
+            'guid'        => $link,
+            'description' => $excerpt,
+            'pubDate'     => $post->published_at?->toRfc2822String(),
+            'author'      => $post->author?->username ?? 'Skinbase',
+            'category'    => null,
+            'enclosure'   => !empty($post->featured_image) ? [
+                'url'    => $post->featured_image,
+                'length' => 0,
+                'type'   => 'image/jpeg',
+            ] : null,
+        ];
+    }
+}