[FEATURE] Ability to stream to an Amazon S3 bucket (#2326)

Related #2249

Author: ayacoo

CHANGELOG.md

@@ -28,6 +28,8 @@ and this project adheres to [Semantic Versioning](https://semver.org).
 - More flexibility in the StringValueBinder to determine what datatypes should be treated as strings [PR #2138](https://github.com/PHPOffice/PhpSpreadsheet/pull/2138)
 - Helper class for conversion between css size Units of measure (`px`, `pt`, `pc`, `in`, `cm`, `mm`). [PR #2152](https://github.com/PHPOffice/PhpSpreadsheet/issues/2145)
 - Allow Row height and Column Width to be set using different units of measure (`px`, `pt`, `pc`, `in`, `cm`, `mm`), rather than only in points or MS Excel column width units. [PR #2152](https://github.com/PHPOffice/PhpSpreadsheet/issues/2145)
+- Ability to stream to an Amazon S3 bucket
+ [Issue #2249](https://github.com/PHPOffice/PhpSpreadsheet/issues/2249)
 
 ### Changed
 

src/PhpSpreadsheet/Writer/BaseWriter.php

@@ -115,7 +115,12 @@ public function openFileHandle($filename): void
             return;
         }
 
-        $fileHandle = $filename ? fopen($filename, 'wb+') : false;
+        $mode = 'wb+';
+        $scheme = parse_url($filename, PHP_URL_SCHEME);
+        if ($scheme === 's3') {
+            $mode = 'w';
+        }
+        $fileHandle = $filename ? fopen($filename, $mode) : false;
         if ($fileHandle === false) {
             throw new Exception('Could not open file "' . $filename . '" for writing.');
         }