新增显示附件图片功能

README.md

@@ -11,9 +11,9 @@ composer require mradang/laravel-attachment
 1. 添加 .env 环境变量，使用默认值时可省略
 ```
 # 附件存储在 storage 下的目录名（默认：attachments）
-ATTACHMENT_FOLDER=attachments
+ATTACHMENT_DIRECTORY=attachments
 # 缩略图存储在 storage 下的目录名（默认：thumbs）
-ATTACHMENT_THUMB_FOLDER=thumbs
+ATTACHMENT_THUMBNAIL=thumbs
 ```
 
 ## 添加的内容
@@ -36,6 +36,7 @@ use mradang\LaravelAttachment\Traits\AttachmentTrait;
 > - void attachmentSort(array $data) 附件排序
 > - string attachmentUrl($id) 附件 Url
 > - response attachmentDownload($id) 下载指定附件
+> - response attachmentShowImage($id, int $width, int $height) 显示附件图片
 > - void attachmentDelete($id) 删除模型的指定附件
 > - void attachmentClear() 清空模型的全部附件
 

config/config.php

@@ -12,4 +12,9 @@
      */
     'directory' => env('ATTACHMENT_DIRECTORY', 'attachments'),
 
+    /*
+     * Thumbnail directory.
+     */
+    'thumbnail' => env('ATTACHMENT_THUMBNAIL', 'thumbnails'),
+
 ];

src/Jobs/MakeThumbnail.php

@@ -0,0 +1,42 @@
+<?php
+
+namespace mradang\LaravelAttachment\Jobs;
+
+use Illuminate\Bus\Queueable;
+use Illuminate\Queue\SerializesModels;
+use Illuminate\Queue\InteractsWithQueue;
+use Illuminate\Contracts\Queue\ShouldQueue;
+use Illuminate\Foundation\Bus\Dispatchable;
+
+use mradang\LaravelAttachment\Services\AttachmentService;
+
+class MakeThumbnail implements ShouldQueue
+{
+    use Dispatchable, InteractsWithQueue, Queueable, SerializesModels;
+
+    protected $file_storage;
+    protected $width;
+    protected $height;
+
+    /**
+     * Create a new job instance.
+     *
+     * @return void
+     */
+    public function __construct(string $file_storage, int $width, int $height)
+    {
+        $this->file_storage = $file_storage;
+        $this->width = $width;
+        $this->height = $height;
+    }
+
+    /**
+     * Execute the job.
+     *
+     * @return void
+     */
+    public function handle()
+    {
+        AttachmentService::makeThumb($this->file_storage, $this->width, $this->height);
+    }
+}

src/Services/AttachmentService.php

@@ -6,6 +6,7 @@
 use GuzzleHttp\Client;
 use Illuminate\Support\Facades\Storage;
 use Illuminate\Http\File;
+use mradang\LaravelAttachment\Jobs\MakeThumbnail;
 
 class AttachmentService
 {
@@ -98,6 +99,71 @@ public static function download($class, $key, $id)
         return Storage::disk(config('attachment.disk'))->download($attachment->filename);
     }
 
+    public static function showImage($class, $key, int $id, int $width, int $height)
+    {
+        $attachment = Attachment::where([
+            'id' => $id,
+            'attachmentable_id' => $key,
+            'attachmentable_type' => $class,
+        ])->firstOrFail();
+
+        if (empty($attachment->imageInfo)) {
+            abort('500', 'Not a picture.');
+        }
+
+        if (!$width || !$height) {
+            return Storage::disk(config('attachment.disk'))->download($attachment->filename);
+        }
+
+        $thumb = self::generateThumbName($attachment->filename, $width, $height);
+        if (!Storage::disk(config('attachment.disk'))->exists($thumb)) {
+            dispatch(new MakeThumbnail($attachment->filename, $width, $height));
+            return Storage::disk(config('attachment.disk'))->download($attachment->filename);
+        }
+
+        return Storage::disk(config('attachment.disk'))->download($thumb);
+    }
+
+    // 生成图片缩略图
+    public static function makeThumb(string $storage_filename, int $width, int $height)
+    {
+        $storagePath = Storage::disk(config('attachment.disk'))->getDriver()->getAdapter()->getPathPrefix();
+        $pathname = $storagePath . $storage_filename;
+
+        if (!is_file($pathname)) {
+            return false;
+        }
+
+        $imagesize = @getimagesize($pathname);
+        if (!is_array($imagesize)) {
+            return false;
+        }
+
+        $thumb_full = $storagePath . self::generateThumbName($storage_filename, $width, $height);
+
+        if (!is_file($thumb_full)) {
+            $path = dirname($thumb_full);
+            if (!is_dir($path)) {
+                mkdir($path, 0755, true);
+            }
+            $image = new \Gumlet\ImageResize($pathname);
+            $image->resizeToBestFit($width, $height);
+            $image->save($thumb_full, \IMAGETYPE_JPEG);
+        }
+    }
+
+    // 生成缩略图存储文件名
+    private static function generateThumbName(string $storage_filename, int $width, int $height)
+    {
+        return sprintf(
+            '%s/%s_%dx%d.jpg',
+            \rtrim(config('attachment.thumbnail'), '/'),
+            $storage_filename,
+            $width,
+            $height
+        );
+    }
+
     public static function delete($class, $key, $id)
     {
         $attachment = Attachment::where([

src/Traits/AttachmentTrait.php

@@ -38,6 +38,11 @@ public function attachmentDownload($id)
         return AttachmentService::download(__CLASS__, $this->getKey(), $id);
     }
 
+    public function attachmentShowImage($id, int $width = 0, int $height = 0)
+    {
+        return AttachmentService::showImage(__CLASS__, $this->getKey(), $id, $width, $height);
+    }
+
     public function attachmentDelete($id)
     {
         return AttachmentService::delete(__CLASS__, $this->getKey(), $id);