From 16704249bd183140ca61a52ae750b275543911a2 Mon Sep 17 00:00:00 2001
From: Ben Ramsey <ben@benramsey.com>
Date: Wed, 11 Oct 2023 20:37:54 -0400
Subject: [PATCH] feat: validate default_locale INI value upon setting it

---
 src/php/ecma_intl.c                    | 39 +++++++++++++++++++++++++-
 tests/phpt/ini-default_locale-005.phpt |  2 ++
 tests/phpt/ini-default_locale-006.phpt | 14 +++++++++
 3 files changed, 54 insertions(+), 1 deletion(-)
 create mode 100644 tests/phpt/ini-default_locale-006.phpt

diff --git a/src/php/ecma_intl.c b/src/php/ecma_intl.c
index 8dd3faa..a57b42b 100644
--- a/src/php/ecma_intl.c
+++ b/src/php/ecma_intl.c
@@ -31,8 +31,10 @@
 #include <php_ini.h>
 #include <unicode/ucal.h>
 
+static ZEND_INI_MH(onUpdateLocale);
+
 PHP_INI_BEGIN()
-PHP_INI_ENTRY(PHP_ECMA_INI_DEFAULT_LOCALE, "", PHP_INI_ALL, NULL)
+PHP_INI_ENTRY(PHP_ECMA_INI_DEFAULT_LOCALE, "", PHP_INI_ALL, onUpdateLocale)
 PHP_INI_END()
 
 zend_module_entry ecma_intl_module_entry = {STANDARD_MODULE_HEADER,
@@ -108,3 +110,38 @@ PHP_MINFO_FUNCTION(ecma_intl)
 
 	DISPLAY_INI_ENTRIES();
 }
+
+static ZEND_INI_MH(onUpdateLocale)
+{
+	zend_result result = FAILURE;
+
+	if (!new_value || (new_value && !ZSTR_VAL(new_value)[0])) {
+		return result;
+	}
+
+	char **available, *bestAvailable, *canonicalized;
+	size_t total, length;
+	ecma402_errorStatus *status;
+
+	available = (char **)malloc(sizeof(char *) * uloc_countAvailable());
+	bestAvailable = (char *)malloc(sizeof(char) * ULOC_FULLNAME_CAPACITY);
+	total = ecma402_intlAvailableLocales(available);
+
+	if (ecma402_bestAvailableLocale(available, total, ZSTR_VAL(new_value), bestAvailable, false) > 0) {
+		status = ecma402_initErrorStatus();
+		canonicalized = (char *)malloc(sizeof(char) * ULOC_FULLNAME_CAPACITY);
+		length = ecma402_canonicalizeUnicodeLocaleId(bestAvailable, canonicalized, status);
+
+		if (!ecma402_hasError(status) && length > 0) {
+			result = SUCCESS;
+		}
+
+		free(canonicalized);
+		ecma402_freeErrorStatus(status);
+	}
+
+	free(bestAvailable);
+	free(available);
+
+	return result;
+}
diff --git a/tests/phpt/ini-default_locale-005.phpt b/tests/phpt/ini-default_locale-005.phpt
index c7c971d..c0638dd 100644
--- a/tests/phpt/ini-default_locale-005.phpt
+++ b/tests/phpt/ini-default_locale-005.phpt
@@ -10,6 +10,7 @@ declare(strict_types=1);
 
 var_dump(ini_set('ecma_intl.default_locale', 'en-US'));
 var_dump(ini_set('ecma_intl.default_locale', 'en_US'));
+var_dump(ini_set('ecma_intl.default_locale', 'foobar'));
 var_dump(ini_set('ecma_intl.default_locale', 'en-Latn-US'));
 var_dump(ini_set('ecma_intl.default_locale', 'en-US-POSIX'));
 var_dump(ini_set('ecma_intl.default_locale', 'en_US_POSIX'));
@@ -19,6 +20,7 @@ var_dump(ini_get('ecma_intl.default_locale'));
 --EXPECT--
 string(0) ""
 string(5) "en-US"
+bool(false)
 string(5) "en_US"
 string(10) "en-Latn-US"
 string(11) "en-US-POSIX"
diff --git a/tests/phpt/ini-default_locale-006.phpt b/tests/phpt/ini-default_locale-006.phpt
new file mode 100644
index 0000000..2a14e3e
--- /dev/null
+++ b/tests/phpt/ini-default_locale-006.phpt
@@ -0,0 +1,14 @@
+--TEST--
+ecma_intl.default_locale has an empty string when set to an invalid value
+--EXTENSIONS--
+ecma_intl
+--INI--
+ecma_intl.default_locale=foobar
+--FILE--
+<?php
+declare(strict_types=1);
+
+var_dump(ini_get('ecma_intl.default_locale'));
+
+--EXPECT--
+string(0) ""