From 21af0ff4878f23033dd17d0e9bb5297070a5e39d Mon Sep 17 00:00:00 2001
From: Julian Rex <julian.rex@mapbox.com>
Date: Wed, 20 Nov 2019 12:44:39 -0500
Subject: [PATCH] [ios] Refactor host checks (#15948)

---
 platform/darwin/src/http_file_source.mm | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/platform/darwin/src/http_file_source.mm b/platform/darwin/src/http_file_source.mm
index b0f69f4a7..dbf92aa46 100644
--- a/platform/darwin/src/http_file_source.mm
+++ b/platform/darwin/src/http_file_source.mm
@@ -195,14 +195,21 @@ HTTPFileSource::HTTPFileSource()
 
 HTTPFileSource::~HTTPFileSource() = default;
 
+MGL_EXPORT
+BOOL isValidMapboxEndpoint(NSURL *url) {
+    return ([url.host isEqualToString:@"mapbox.com"] ||
+            [url.host hasSuffix:@".mapbox.com"] ||
+            [url.host isEqualToString:@"mapbox.cn"] ||
+            [url.host hasSuffix:@".mapbox.cn"]);
+}
+
 MGL_EXPORT
 NSURL *resourceURLWithAccountType(const Resource& resource, NSInteger accountType) {
     
     NSURL *url = [NSURL URLWithString:@(resource.url.c_str())];
     
 #if TARGET_OS_IPHONE || TARGET_OS_SIMULATOR
-    if (accountType == 0 &&
-        ([url.host isEqualToString:@"mapbox.com"] || [url.host hasSuffix:@".mapbox.com"])) {
+    if (accountType == 0 && isValidMapboxEndpoint(url)) {
         NSURLComponents *components = [NSURLComponents componentsWithURL:url resolvingAgainstBaseURL:NO];
         NSMutableArray *queryItems = [NSMutableArray array];