support android dedicated key

Author: jwfing

lib/storage-extra.js

@@ -7,6 +7,10 @@ if (process.env.LEANCLOUD_REGION) {
   AV._config.region = process.env.LEANCLOUD_REGION;
 }
 
+if (process.env.LEANCLOUD_APP_ANDX_KEY) {
+  AV._config.androidxKey = process.env.LEANCLOUD_APP_ANDX_KEY;
+}
+
 if (process.env.LC_API_SERVER) {
   AV.setServerURLs(process.env.LC_API_SERVER);
 }

middleware/leancloud-headers.js

@@ -87,7 +87,7 @@ module.exports = function(AV) {
           sign = _ref[0];
           timestamp = _ref[1];
           master = _ref[2];
-          key = master === 'master' ? AV.masterKey : AV.applicationKey;
+          key = master === 'master' ? AV.masterKey : ( master === 'ax-sig-1' ? AV._config.androidxKey : AV.applicationKey);
           validSign = signByKey(timestamp, key);
           if (validSign === sign.toLowerCase()) {
             if (master === 'master') {