Use default server time zone if non provided

Signed-off-by: Christian Wolf <github@christianwolf.email>

lib/Helper/Filter/JSON/TimezoneFixFilter.php

@@ -0,0 +1,55 @@
+<?php
+
+namespace OCA\Cookbook\Helper\Filter\JSON;
+
+use DateTime;
+use DateTimeZone;
+use Psr\Log\LoggerInterface;
+
+/**
+ * Fix the timestamp of the dates created and modified for recipe stubs to have a timezone
+ *
+ * This expects ISO conforming time data as input
+ */
+class TimezoneFixFilter extends AbstractJSONFilter {
+	/** @var LoggerInterface */
+	private $logger;
+
+	public function __construct(LoggerInterface $logger) {
+		$this->logger = $logger;
+	}
+
+	public function apply(array &$json): bool {
+		$changed = false;
+		foreach(['dateCreated', 'dateModified'] as $key) {
+			if(isset($json[$key]) && $json[$key]) {
+				$json[$key] = $this->handleTimestamp($json[$key], $changed);
+			}
+		}
+		return $changed;
+	}
+
+	private function handleTimestamp(string $value, bool &$changed): string {
+		$pattern = '/^([0-9]{4}-[0-9]{2}-[0-9]{2})T([0-9]{1,2}:[0-9]{2}:[0-9]{2}(?:[.,][0-9]+)?)(\+[0-9]{2}:?[0-9]{2})/';
+		$match = preg_match($pattern, $value, $matches);
+
+		if($match == 1) {
+			return $value;
+		}
+
+		try {
+			$defaultTimezone = date_default_timezone_get();
+		} catch (\Exception $ex) {
+			$this->logger->error('Cannot get the default timezone of server.');
+			return $value;
+		}
+		$serverTimeZone = new DateTimeZone($defaultTimezone);
+		$now = new DateTime('now', $serverTimeZone);
+		$offsetSec = $serverTimeZone->getOffset($now);
+		$offsetHour = $offsetSec / 3600;
+
+		$changed = true;
+		return sprintf('%s%+05d', $value, $offsetHour * 100);
+	}
+
+}

lib/Helper/Filter/Output/RecipeStubFilter.php

@@ -6,6 +6,7 @@ use OCA\Cookbook\Helper\Filter\JSON\AbstractJSONFilter;
 use OCA\Cookbook\Helper\Filter\JSON\RecipeIdCopyFilter;
 use OCA\Cookbook\Helper\Filter\JSON\RecipeIdTypeFilter;
 use OCA\Cookbook\Helper\Filter\JSON\TimestampFixFilter;
+use OCA\Cookbook\Helper\Filter\JSON\TimezoneFixFilter;
 
 class RecipeStubFilter {
 	/** @var AbstractJSONFilter[] */
@@ -14,12 +15,14 @@ class RecipeStubFilter {
 	public function __construct(
 		RecipeIdTypeFilter $recipeIdTypeFilter,
 		RecipeIdCopyFilter $recipeIdCopyFilter,
-		TimestampFixFilter $timestampFixFilter
+		TimestampFixFilter $timestampFixFilter,
+		TimezoneFixFilter $timezoneFixFilter
 	) {
 		$this->filters = [
 			$recipeIdCopyFilter,
 			$recipeIdTypeFilter,
 			$timestampFixFilter,
+			$timezoneFixFilter,
 		];
 	}
 

tests/Unit/Helper/Filter/JSON/TimezoneFixFilterTest.php

@@ -0,0 +1,54 @@
+<?php
+
+namespace OCA\Cookbook\tests\Unit\Helper\Filter\JSON;
+
+use DateTime;
+use DateTimeZone;
+use OCA\Cookbook\Helper\Filter\JSON\TimezoneFixFilter;
+use PHPUnit\Framework\TestCase;
+use Psr\Log\LoggerInterface;
+
+class TimezoneFixFilterTest extends TestCase {
+	/** @var TimezoneFixFilter */
+	private $dut;
+
+	public function setUp(): void {
+		$logger = $this->createStub(LoggerInterface::class);
+		$this->dut = new TimezoneFixFilter($logger);
+	}
+
+	public function db() {
+		$defaultTimezone = date_default_timezone_get();
+		$tz = new DateTimeZone($defaultTimezone);
+		$now = new DateTime('now', $tz);
+		$offset = $tz->getOffset($now);
+		$hours = sprintf('%+03d00', $offset / 3600);
+
+		yield ["2024-05-20T10:12:00$hours", "2024-05-20T10:12:00$hours", false];
+		yield ["2024-05-20T10:12:00", "2024-05-20T10:12:00$hours", true];
+		yield ["2024-05-20T10:12:00.20$hours", "2024-05-20T10:12:00.20$hours", false];
+		yield ["2024-05-20T10:12:00.20", "2024-05-20T10:12:00.20$hours", true];
+		yield ["2024-05-20T1:12:00$hours", "2024-05-20T1:12:00$hours", false];
+		yield ["2024-05-20T1:12:00", "2024-05-20T1:12:00$hours", true];
+	}
+
+	/** @dataProvider db */
+	public function testFilter($inputDate, $expectedDate, $changed) {
+		$input = $this->getStub($inputDate);
+		$expected = $this->getStub($expectedDate);
+
+		$ret = $this->dut->apply($input);
+
+		$this->assertEquals($expected, $input);
+		$this->assertEquals($changed, $ret);
+	}
+
+	private function getStub($date) {
+		return [
+			'name' => 'Test Recipe',
+			'id' => 123,
+			'dateCreated' => $date,
+			'dateModified' => $date,
+		];
+	}
+}