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Parse Session ID from GA cookies #108

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Merged
aawnu merged 2 commits into from
Jan 26, 2026
Merged

Parse Session ID from GA cookies #108

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e27d230
add parseSessionCookie helper method
tobz-nz Dec 5, 2025
cb7276b
add tests for praseing session cookies
tobz-nz Dec 5, 2025
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66 changes: 65 additions & 1 deletion src/Helper/ConvertHelper.php
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Original file line number Diff line number Diff line change
Expand Up @@ -2,8 +2,8 @@

namespace AlexWestergaard\PhpGa4\Helper;

use AlexWestergaard\PhpGa4\Facade\Type\EventType;
use AlexWestergaard\PhpGa4\Exception\Ga4Exception;
use AlexWestergaard\PhpGa4\Facade\Type\EventType;

class ConvertHelper
{
Expand Down Expand Up @@ -77,4 +77,68 @@ public static function parseEvents(array $list): array
}
return $events;
}

/**
* Parse the session cookie (GA_{measurement_id}) into named parts.
*
* @param string $session The cookie value
* @return array
*/
public static function parseSessionCookie(string $session): array
{
$parts = explode('.', $session);

$version = $parts[0] ?? null;
$k = $parts[1] ?? null;
$data = $parts[2] ?? null;

// If the data part is empty, return an empty array
if (!$data) {
return [];
}

if ($version === 'GS1') {
$data = explode('.', $session);

return [
'version' => $data[0] ?? null,
'domain_level' => $data[1] ?? null,
'session_id' => $data[2] ?? null,
'session_number' => $data[3] ?? null,
'session_engagement' => $data[4] ?? null,
'timestampt' => $data[5] ?? null
];
}

$cookieParts = explode('$', $data);

if (empty(array_filter($cookieParts))) {
return [];
}

$data = array_map(
fn ($part) => match ($part[0]) {
's' => ['session_id' => $part],
't' => ['timestamp' => $part],
'o' => ['session_number' => $part],
'g' => ['session_engaged' => $part],
'j' => ['join_timer' => $part],
'l' => ['logged_in_state' => $part],
'h' => ['user_id' => $part],
'd' => ['join_id' => $part],
default => [$part[0] => $part]
},
$cookieParts
);

$result = [];

foreach ($data as $mapValue) {
foreach ($mapValue as $key => $value) {
$result[$key] = $value;
}
}

return $result;
}
}
52 changes: 50 additions & 2 deletions test/Unit/HelperTest.php
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Original file line number Diff line number Diff line change
Expand Up @@ -2,9 +2,9 @@

namespace AlexWestergaard\PhpGa4Test\Unit;

use AlexWestergaard\PhpGa4\Helper;
use AlexWestergaard\PhpGa4\Facade;
use AlexWestergaard\PhpGa4\Event;
use AlexWestergaard\PhpGa4\Facade;
use AlexWestergaard\PhpGa4\Helper;
use AlexWestergaard\PhpGa4Test\MeasurementTestCase;

final class HelperTest extends MeasurementTestCase
Expand Down Expand Up @@ -82,4 +82,52 @@ public function test_timeasmicro_throws_too_large()

$this->analytics->setTimestampMicros($time);
}

public function test_parse_session_cookie_gs1()
{
$sessionData = Helper\ConvertHelper::parseSessionCookie('GS1.1.1689053763.1.1.1689054101.0.0.0');
$this->assertEquals([
'version' => 'GS1',
'domain_level' => '1',
'session_id' => '1689053763',
'session_number' => '1',
'session_engagement' => '1',
'timestampt' => '1689054101',
], $sessionData);
}

public function test_parse_session_cookie_gs2()
{
$sessionData = Helper\ConvertHelper::parseSessionCookie('GS2.1.s1764888982$o50$g1$t1764890260$j59$l0$h681028196');
$this->assertEquals([
'session_id' => 's1764888982',
'session_number' => 'o50',
'session_engaged' => 'g1',
'timestamp' => 't1764890260',
'join_timer' => 'j59',
'logged_in_state' => 'l0',
'user_id' => 'h681028196',
], $sessionData);

// same data, different order
$sessionData = Helper\ConvertHelper::parseSessionCookie('GS2.1.t1764890260$o50$g1$s1764888982$j59$l0$h681028196');
$this->assertEquals([
'session_id' => 's1764888982',
'session_number' => 'o50',
'session_engaged' => 'g1',
'timestamp' => 't1764890260',
'join_timer' => 'j59',
'logged_in_state' => 'l0',
'user_id' => 'h681028196',
], $sessionData);
}

public function test_parse_session_cookie_invalid()
{
$sessionData = Helper\ConvertHelper::parseSessionCookie('invalid');
$this->assertEquals([], $sessionData);

$sessionData = Helper\ConvertHelper::parseSessionCookie('');
$this->assertEquals([], $sessionData);
}
}