Not Finding Rels File (#3554)

* Not Finding Rels File

Fix #3553. Read of `\xl\worksheets\_rels\sheet1.xml.rels` fails on the new test worksheet (generated by 3rd party product), but read of `xl\worksheets\_rels\sheet1.xml.rels` (same name without leading slash) succeeds. I'm not sure why (over 400 tests succeed with the slash), so will probably delay this a bit while I do more research.

* Move Fix

Move to more logical place.

src/PhpSpreadsheet/Reader/Xlsx.php

@@ -525,6 +525,10 @@ class Xlsx extends BaseReader
         foreach ($rels->Relationship as $relx) {
             $rel = self::getAttributes($relx);
             $relTarget = (string) $rel['Target'];
+            // issue 3553
+            if ($relTarget[0] === '/') {
+                $relTarget = substr($relTarget, 1);
+            }
             $relType = (string) $rel['Type'];
             $mainNS = self::REL_TO_MAIN[$relType] ?? Namespaces::MAIN;
             switch ($relType) {

tests/PhpSpreadsheetTests/Reader/Xlsx/Issue3553Test.php

@@ -0,0 +1,37 @@
+<?php
+
+namespace PhpOffice\PhpSpreadsheetTests\Reader\Xlsx;
+
+use PhpOffice\PhpSpreadsheet\Reader\Xlsx;
+
+class Issue3553Test extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @var string
+     */
+    private static $testbook = 'tests/data/Reader/XLSX/issue.3553.xlsx';
+
+    public function testPreliminaries(): void
+    {
+        $file = 'zip://';
+        $file .= self::$testbook;
+        $file .= '#_rels/.rels';
+        $data = file_get_contents($file);
+        // confirm that file contains expected namespaced xml tag
+        if ($data === false) {
+            self::fail('Unable to read file');
+        } else {
+            self::assertStringContainsString('<Relationship Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/officeDocument" Target="/xl/workbook.xml" Id="rId2" />', $data, 'Unexpected leading slash in Target attribute');
+        }
+    }
+
+    public function testIssue3553(): void
+    {
+        $reader = new Xlsx();
+        $spreadsheet = $reader->load(self::$testbook);
+        $sheet = $spreadsheet->getActiveSheet();
+        self::assertSame('https://microsoft.com/', $sheet->getCell('B2')->getHyperlink()->getUrl());
+
+        $spreadsheet->disconnectWorksheets();
+    }
+}