在 Laravel 5.4 ( Symfony )中，检测上传文件的扩展名
1、上传图片文件时报错，原因在于上传了 gif 格式的图片，当做了 JPEG 格式来处理。如图1
图1
1 2 3 4 5 | { "code": 1, "message": "success", "result": "imagecreatefromjpeg(): gd-jpeg: JPEG library reports unrecoverable error: Not a JPEG file: starts with 0x47 0x49"} |
2、查看相应代码实现。
1 2 3 4 5 6 7 8 9 10 11 | public function upload(Request $request, StorageService $storageService){ $files = $request->files->all(); try { $logoImages = $storageService->storeAsTmpImage($files['upfile'], ['ext' => 'csv']); return $this->respondJson(['result' => $logoImages['url']]); } catch (\Exception $e) { return $this->respondJson(['result' => $e->getMessage(), 'code' => 1]); }} |
3、决定在收到请求后，先判断一下文件的扩展名。参考网址：https://github.com/symfony/symfony/blob/3.0/src/Symfony/Component/HttpFoundation/File/UploadedFile.php 。返回原始文件扩展名。使用方法：getClientOriginalExtension() 。如图2
图2
4、获取文件扩展名，转换为小写字母。再判断范围。相应代码实现。
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | public function upload(Request $request, StorageService $storageService){ $files = $request->files->all(); $extension = strtolower($files['upfile']->getClientOriginalExtension()); if (!in_array($extension, ['jpg', 'jpeg', 'png'])) { return $this->respondJson([ 'code' => 1, 'message' => '格式错误，仅支持PNG、JPG格式', ]); } try { $logoImages = $storageService->storeAsTmpImage($files['upfile'], ['ext' => 'csv']); return $this->respondJson(['result' => $logoImages['url']]); } catch (\Exception $e) { return $this->respondJson(['result' => $e->getMessage(), 'code' => 1]); }} |
5、上传图片：2 – 副本.GIF，提示图片上传失败：格式错误，仅支持PNG、JPG格式，符合预期。提示信息有待于前端基于接口响应完善。如图3
图3
1 2 3 4 | { "code": 1, "message": "格式错误，仅支持PNG、JPG格式"} |
![在 WSL2 中的 Ubuntu 系统中，执行命令：sudo apt install php7.4-cli，报错：E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/p/php7.4/php7.4-common_7.4.3-4ubuntu2.5_amd64.deb 404 Not Found [IP: 91.189.88.152 80]。](https://www.shuijingwanwq.com/wp-content/uploads/2021/12/1-7-520x245.png)
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