add publish module

app/Models/File.php

@@ -0,0 +1,69 @@
+<?php
+
+namespace App\Models;
+
+use App\Dataset;
+use App\Models\HashValue;
+use Illuminate\Database\Eloquent\Model;
+
+class File extends Model
+{
+    protected $table = 'document_files';
+    public $timestamps = true;
+
+    protected $fillable = ['path_name', 'file_size', 'mime_type', 'label', 'sort_order'];
+
+    public function dataset()
+    {
+        return $this->belongsTo(Dataset::class, 'document_id', 'id');
+    }
+
+    public function hashvalues()
+    {
+        return $this->hasMany(HashValue::class, 'file_id', 'id');
+    }
+
+     /**
+     * Create hash value model objects from original file.
+     *
+     * TODO throws Exception in case hash computation is not possible
+     *      (e.g., if referenced file is missing in file system)
+     *
+     * @return void
+     */
+    public function createHashValues()
+    {
+        $hashtypes = array('md5', 'sha512');
+        
+        foreach ($hashtypes as $type) {
+            $hash = new HashValue();
+            $hash->type = $type;
+            $hashString = $this->getRealHash($type);
+            $hash->value = $hashString;
+            $this->hashvalues()->save($hash);
+        }
+    }
+
+     /**
+     * Get the hash value of the file
+     *
+     * @param string $type Type of the hash value, @see hash_file();
+     * @return string hash value
+     */
+    private function getRealHash($type)
+    {
+        $hash = @hash_file($type, $this->getPath());
+        if (empty($hash)) {
+            throw new \Exception("Empty HASH for file '" . $this->getPath() . "'");
+        }
+        return $hash;
+    }
+
+    /**
+     * Get full path of destination file.
+     */
+    private function getPath()
+    {
+        return  storage_path('app/public/' . $this->path_name);
+    }
+}