Removing usage of std::stoll which isn't avaliable on Android.

Author: stgates

Release/src/http/oauth/oauth2.cpp

@@ -187,15 +187,19 @@ oauth2_token oauth2_config::_parse_token_from_json(const json::value& token_json
 
     if (token_json.has_field(oauth2_strings::expires_in))
     {
-        auto json_expires_in_val = token_json.at(oauth2_strings::expires_in);
+        const auto &json_expires_in_val = token_json.at(oauth2_strings::expires_in);
 
         if (json_expires_in_val.is_number())
            result.set_expires_in(json_expires_in_val.as_number().to_int64());
         else 
         {
-           // handle the case of a number as a JSON "string".
-           // std::stoll() will throw an exception if no conversion is possible.
-           result.set_expires_in(std::stoll(json_expires_in_val.as_string()));
+            // Handle the case of a number as a JSON "string".
+            // Using streams because std::stoll isn't avaliable on Android.
+            int64_t expires;
+            utility::istringstream_t iss(json_expires_in_val.as_string());
+            iss.exceptions(std::ios::badbit | std::ios::failbit);
+            iss >> expires;
+            result.set_expires_in(expires);
         }
     }
     else