ZIP Import: Added model+migration, and reader class

app/Exports/Import.php

@@ -0,0 +1,41 @@
+<?php
+
+namespace BookStack\Exports;
+
+use Carbon\Carbon;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+/**
+ * @property string $path
+ * @property string $name
+ * @property int $size - ZIP size in bytes
+ * @property int $book_count
+ * @property int $chapter_count
+ * @property int $page_count
+ * @property int $created_by
+ * @property Carbon $created_at
+ * @property Carbon $updated_at
+ */
+class Import extends Model
+{
+    use HasFactory;
+
+    public const TYPE_BOOK = 'book';
+    public const TYPE_CHAPTER = 'chapter';
+    public const TYPE_PAGE = 'page';
+
+    /**
+     * Get the type (model) that this import is intended to be.
+     */
+    public function getType(): string
+    {
+        if ($this->book_count === 1) {
+            return self::TYPE_BOOK;
+        } elseif ($this->chapter_count === 1) {
+            return self::TYPE_CHAPTER;
+        }
+
+        return self::TYPE_PAGE;
+    }
+}