完成基本 file api 以及修改 readme

Author: FreedomKnight

readme.md

@@ -6,6 +6,8 @@ FileEntry API is good way to handle files with Laravel Storage.
 
 ### Initialize FileEntry
 
+    use \Unisharp\FileEntry\FileEntry;
+    
     $entry = new FileEntry();
 
 or

src/FileEntry.php

@@ -2,6 +2,66 @@
 
 namespace Unisharp\FileEntry;
 
+use League\Flysystem\FileNotFoundException;
+use Symfony\Component\HttpFoundation\File\UploadedFile;
+
 class FileEntry
 {
+    protected $basepath;
+
+    public function __construct($basepath = '/')
+    {
+        if (mb_substr($basepath, -1, 1, 'utf8') != '/') {
+            $basepath .= '/';
+        }
+
+        $this->basepath = $basepath;
+    }
+
+    public function save(UploadedFile $upload_file, $cus_name = null)
+    {
+        $file = $this->moveFile($upload_file, $cus_name);
+        return $file;
+    }
+
+    private function moveFile($upload_file, $cus_name)
+    {
+        $suffix = $upload_file->getClientOriginalExtension();
+        $filename = uniqid() . '.' . $suffix;
+        if (!empty($cus_name)) {
+            $filename = $cus_name . '.' .$suffix;
+        }
+        \Storage::put(
+            $this->basepath . $filename,
+            file_get_contents($upload_file->getRealPath())
+        );
+
+        \File::delete($upload_file->getRealPath());
+        return $filename;
+    }
+
+    public function response($filename)
+    {
+        try {
+            $path = $this->basepath . $filename;
+            $file = \Storage::get($path);
+            $filetime = \Storage::lastModified($path);
+            $etag = md5($filetime);
+            $time = date('r', $filetime);
+            $expires = date('r', $filetime + 3600);
+            if (trim(\Request::header('If-None-Match'), '\'\"') != $etag ||
+                new \DateTime(\Request::header('If-Modified-Since')) != new \DateTime($time)
+            ) {
+                return response($file, 200)->header('Content-Type', \Storage::mimeType($path))
+                    ->setEtag($etag)
+                    ->setLastModified(new \DateTime($time))
+                    ->setExpires(new \DateTime($expires))
+                    ->setPublic();
+            }
+
+            return response(null, 304)->setPublic();
+        } catch (FileNotFoundException $e) {
+            abort(404);
+        }
+    }
 }