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e_db_pdo::copyRow() - Greatly decrease collision chance

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Increased possible random strings for unique fields in e_db_pdo::copyRow() from 1000 to 59^11 (UserHandler::generateRandomString() "alphanumeric" should have 59 characters to choose from)

If a collision still happens, e_db_pdo::copyRow() retries up to 3 times for a successful copy.

Fixes: #3678
This commit is contained in:
Nick Liu
2019-12-27 21:54:11 +01:00
parent 5e9b3bee14
commit fabb0c2757
2 changed files with 82 additions and 28 deletions
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49
e107_tests/tests/unit/e_db_pdoTest.php
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@@ -118,4 +118,53 @@ class e_db_pdoTest extends e_db_abstractTest
$qry = $this->db->getLastErrorText();
$this->assertGreaterThan(1,$result, $qry);
}
public function test_Db_CopyRowRNGRetry()
{
$original_user_handler = e107::getRegistry('core/e107/singleton/UserHandler');
$evil_user_handler = $this->make('UserHandler', [
'generateRandomString' => function($pattern = '', $seed = '')
{
static $index = 0;
$mock_values = ['same0000000', 'same0000000', 'different00'];
return $mock_values[$index ++];
}
]);
e107::setRegistry('core/e107/singleton/UserHandler', $evil_user_handler);
// test with table that has unique keys.
$result = $this->db->db_CopyRow('core_media_cat', '*', "media_cat_id = 1");
$qry = $this->db->getLastErrorText();
$this->assertGreaterThan(1,$result, $qry);
// test with table that has unique keys. (same row again) - make sure copyRow duplicates it regardless.
$result = $this->db->db_CopyRow('core_media_cat', '*', "media_cat_id = 1");
$qry = $this->db->getLastErrorText();
$this->assertGreaterThan(1,$result, $qry);
e107::setRegistry('core/e107/singleton/UserHandler', $original_user_handler);
}
public function test_Db_CopyRowRNGGiveUp()
{
$original_user_handler = e107::getRegistry('core/e107/singleton/UserHandler');
$evil_user_handler = $this->make('UserHandler', [
'generateRandomString' => function($pattern = '', $seed = '')
{
return 'neverchange';
}
]);
e107::setRegistry('core/e107/singleton/UserHandler', $evil_user_handler);
// test with table that has unique keys.
$result = $this->db->db_CopyRow('core_media_cat', '*', "media_cat_id = 1");
$result = $this->db->db_CopyRow('core_media_cat', '*', "media_cat_id = 1");
$qry = $this->db->getLastErrorText();
$this->assertFalse($result,
"Intentionally broken random number generator should have prevented row copy with unique keys"
);
e107::setRegistry('core/e107/singleton/UserHandler', $original_user_handler);
}
}