Restricted file uploads on iOS Chrome and the iOS app to work around iOS bugs

web/react/utils/utils.jsx

@@ -74,6 +74,21 @@ export function isSafari() {
     return false;
 }
 
+export function isIosChrome() {
+    // https://developer.chrome.com/multidevice/user-agent
+    return navigator.userAgent.indexOf('CriOS') !== -1;
+}
+
+export function isMobileApp() {
+    const userAgent = navigator.userAgent;
+
+    // the mobile app has different user agents for the native api calls and the shim, so handle them both
+    const isApi = userAgent.indexOf('Mattermost') !== -1;
+    const isShim = userAgent.indexOf('iPhone') !== -1 && userAgent.indexOf('Safari') === -1 && userAgent.indexOf('Chrome') === -1;
+
+    return isApi || isShim;
+}
+
 export function isInRole(roles, inRole) {
     var parts = roles.split(' ');
     for (var i = 0; i < parts.length; i++) {