First attempt at #142. Needs a lot of work still.

app/Http/Requests/SplitJournalFormRequest.php

@@ -0,0 +1,85 @@
+<?php
+/**
+ * SplitJournalFormRequest.php
+ * Copyright (C) 2016 thegrumpydictator@gmail.com
+ *
+ * This software may be modified and distributed under the terms
+ * of the MIT license.  See the LICENSE file for details.
+ */
+
+namespace FireflyIII\Http\Requests;
+
+use Auth;
+use Carbon\Carbon;
+
+
+/**
+ * Class SplitJournalFormRequest
+ *
+ * @package FireflyIII\Http\Requests
+ */
+class SplitJournalFormRequest extends Request
+{
+    /**
+     * @return bool
+     */
+    public function authorize(): bool
+    {
+        // Only allow logged in users
+        return Auth::check();
+    }
+
+    /**
+     * @return array
+     */
+    public function getSplitData(): array
+    {
+        $data = [
+            'description'       => $this->get('journal_description'),
+            'currency_id'       => intval($this->get('currency')),
+            'source_account_id' => intval($this->get('source_account_id')),
+            'date'              => new Carbon($this->get('date')),
+            'what'              => $this->get('what'),
+            'interest_date'     => $this->get('interest_date') ? new Carbon($this->get('interest_date')) : null,
+            'book_date'         => $this->get('book_date') ? new Carbon($this->get('book_date')) : null,
+            'process_date'      => $this->get('process_date') ? new Carbon($this->get('process_date')) : null,
+            'transactions'      => [],
+        ];
+        // description is leading because it is one of the mandatory fields.
+        foreach ($this->get('description') as $index => $description) {
+            $transaction            = [
+                'description'              => $description,
+                'amount'                   => round($this->get('amount')[$index], 2),
+                'budget_id'                => $this->get('budget')[$index] ? $this->get('budget')[$index] : 0,
+                'category'                 => $this->get('category')[$index] ?? '',
+                'source_account_id'        => intval($this->get('source_account_id')),
+                'destination_account_name' => $this->get('destination_account_name')[$index] ?? ''
+            ];
+            $data['transactions'][] = $transaction;
+        }
+
+        return $data;
+    }
+
+    /**
+     * @return array
+     */
+    public function rules(): array
+    {
+        return [
+            'journal_description'        => 'required|between:1,255',
+            'currency'                   => 'required|exists:transaction_currencies,id',
+            'source_account_id'          => 'numeric|belongsToUser:accounts,id',
+            'what'                       => 'required|in:withdrawal,deposit,transfer',
+            'date'                       => 'required|date',
+            'interest_date'              => 'date',
+            'book_date'                  => 'date',
+            'process_date'               => 'date',
+            'description.*'              => 'required|between:1,255',
+            'destination_account_name.*' => 'between:1,255',
+            'amount.*'                   => 'required|numeric',
+            'budget.*'                   => 'belongsToUser:budgets,id',
+            'category.*'                 => 'between:1,255',
+        ];
+    }
+}