Add attachment thumbnails and ACP refinements

app/Http/Controllers/AttachmentController.php

@@ -5,6 +5,7 @@ namespace App\Http\Controllers;
 use App\Models\Attachment;
 use App\Models\AttachmentExtension;
 use App\Models\Post;
+use App\Models\Setting;
 use App\Models\Thread;
 use Illuminate\Http\JsonResponse;
 use Illuminate\Http\Request;
@@ -114,6 +115,8 @@ class AttachmentController extends Controller
         $path = "attachments/{$scopeFolder}/{$filename}";
         Storage::disk($disk)->putFileAs("attachments/{$scopeFolder}", $file, $filename);
 
+        $thumbnailPayload = $this->maybeCreateThumbnail($file, $scopeFolder);
+
         $attachment = Attachment::create([
             'thread_id' => $threadId,
             'post_id' => $postId,
@@ -122,6 +125,9 @@ class AttachmentController extends Controller
             'user_id' => $user->id,
             'disk' => $disk,
             'path' => $path,
+            'thumbnail_path' => $thumbnailPayload['path'] ?? null,
+            'thumbnail_mime_type' => $thumbnailPayload['mime'] ?? null,
+            'thumbnail_size_bytes' => $thumbnailPayload['size'] ?? null,
             'original_name' => $file->getClientOriginalName(),
             'extension' => $extension !== '' ? $extension : null,
             'mime_type' => $mime,
@@ -162,6 +168,28 @@ class AttachmentController extends Controller
         ]);
     }
 
+    public function thumbnail(Attachment $attachment): Response
+    {
+        if (!$this->canViewAttachment($attachment)) {
+            abort(404);
+        }
+
+        if (!$attachment->thumbnail_path) {
+            abort(404);
+        }
+
+        $disk = Storage::disk($attachment->disk);
+        if (!$disk->exists($attachment->thumbnail_path)) {
+            abort(404);
+        }
+
+        $mime = $attachment->thumbnail_mime_type ?: 'image/jpeg';
+
+        return $disk->response($attachment->thumbnail_path, null, [
+            'Content-Type' => $mime,
+        ]);
+    }
+
     public function destroy(Request $request, Attachment $attachment): JsonResponse
     {
         $user = $request->user();
@@ -279,6 +307,8 @@ class AttachmentController extends Controller
 
     private function serializeAttachment(Attachment $attachment): array
     {
+        $isImage = str_starts_with((string) $attachment->mime_type, 'image/');
+
         return [
             'id' => $attachment->id,
             'thread_id' => $attachment->thread_id,
@@ -294,7 +324,159 @@ class AttachmentController extends Controller
             'mime_type' => $attachment->mime_type,
             'size_bytes' => $attachment->size_bytes,
             'download_url' => "/api/attachments/{$attachment->id}/download",
+            'thumbnail_url' => $attachment->thumbnail_path
+                ? "/api/attachments/{$attachment->id}/thumbnail"
+                : null,
+            'is_image' => $isImage,
             'created_at' => $attachment->created_at?->toIso8601String(),
         ];
     }
+
+    private function maybeCreateThumbnail($file, string $scopeFolder): ?array
+    {
+        $enabled = $this->settingBool('attachments.create_thumbnails', true);
+        if (!$enabled) {
+            return null;
+        }
+
+        $mime = $file->getMimeType() ?? '';
+        if (!str_starts_with($mime, 'image/')) {
+            return null;
+        }
+
+        $maxWidth = $this->settingInt('attachments.thumbnail_max_width', 300);
+        $maxHeight = $this->settingInt('attachments.thumbnail_max_height', 300);
+        if ($maxWidth <= 0 || $maxHeight <= 0) {
+            return null;
+        }
+
+        $sourcePath = $file->getPathname();
+        $info = @getimagesize($sourcePath);
+        if (!$info) {
+            return null;
+        }
+
+        [$width, $height] = $info;
+        if ($width <= 0 || $height <= 0) {
+            return null;
+        }
+
+        if ($width <= $maxWidth && $height <= $maxHeight) {
+            return null;
+        }
+
+        $ratio = min($maxWidth / $width, $maxHeight / $height);
+        $targetWidth = max(1, (int) round($width * $ratio));
+        $targetHeight = max(1, (int) round($height * $ratio));
+
+        $sourceImage = $this->createImageFromFile($sourcePath, $mime);
+        if (!$sourceImage) {
+            return null;
+        }
+
+        $thumbImage = imagecreatetruecolor($targetWidth, $targetHeight);
+        if (!$thumbImage) {
+            imagedestroy($sourceImage);
+            return null;
+        }
+
+        if (in_array($mime, ['image/png', 'image/gif'], true)) {
+            imagecolortransparent($thumbImage, imagecolorallocatealpha($thumbImage, 0, 0, 0, 127));
+            imagealphablending($thumbImage, false);
+            imagesavealpha($thumbImage, true);
+        }
+
+        imagecopyresampled(
+            $thumbImage,
+            $sourceImage,
+            0,
+            0,
+            0,
+            0,
+            $targetWidth,
+            $targetHeight,
+            $width,
+            $height
+        );
+
+        $quality = $this->settingInt('attachments.thumbnail_quality', 85);
+        $thumbBinary = $this->renderImageBinary($thumbImage, $mime, $quality);
+
+        imagedestroy($sourceImage);
+        imagedestroy($thumbImage);
+
+        if ($thumbBinary === null) {
+            return null;
+        }
+
+        $filename = Str::uuid()->toString();
+        $extension = strtolower((string) $file->getClientOriginalExtension());
+        if ($extension !== '') {
+            $filename .= ".{$extension}";
+        }
+
+        $disk = 'local';
+        $thumbPath = "attachments/{$scopeFolder}/thumbs/{$filename}";
+        Storage::disk($disk)->put($thumbPath, $thumbBinary);
+
+        return [
+            'path' => $thumbPath,
+            'mime' => $mime,
+            'size' => strlen($thumbBinary),
+        ];
+    }
+
+    private function createImageFromFile(string $path, string $mime)
+    {
+        return match ($mime) {
+            'image/jpeg', 'image/jpg' => @imagecreatefromjpeg($path),
+            'image/png' => @imagecreatefrompng($path),
+            'image/gif' => @imagecreatefromgif($path),
+            'image/webp' => function_exists('imagecreatefromwebp') ? @imagecreatefromwebp($path) : null,
+            default => null,
+        };
+    }
+
+    private function renderImageBinary($image, string $mime, int $quality): ?string
+    {
+        ob_start();
+        $success = false;
+
+        if (in_array($mime, ['image/jpeg', 'image/jpg'], true)) {
+            $success = imagejpeg($image, null, max(10, min(95, $quality)));
+        } elseif ($mime === 'image/png') {
+            $compression = (int) round(9 - (max(10, min(95, $quality)) / 100) * 9);
+            $success = imagepng($image, null, $compression);
+        } elseif ($mime === 'image/gif') {
+            $success = imagegif($image);
+        } elseif ($mime === 'image/webp' && function_exists('imagewebp')) {
+            $success = imagewebp($image, null, max(10, min(95, $quality)));
+        }
+
+        $data = ob_get_clean();
+
+        if (!$success) {
+            return null;
+        }
+
+        return $data !== false ? $data : null;
+    }
+
+    private function settingBool(string $key, bool $default): bool
+    {
+        $value = Setting::query()->where('key', $key)->value('value');
+        if ($value === null) {
+            return $default;
+        }
+        return in_array(strtolower($value), ['1', 'true', 'yes', 'on'], true);
+    }
+
+    private function settingInt(string $key, int $default): int
+    {
+        $value = Setting::query()->where('key', $key)->value('value');
+        if ($value === null) {
+            return $default;
+        }
+        return (int) $value;
+    }
 }