Merge pull request #1145 from garvankeeley/updater-safety

Add safety checks to updater. Maybe overkill, best to be safe.

Author: garvankeeley

android/src/main/java/org/mozilla/mozstumbler/client/Updater.java

@@ -66,10 +66,25 @@ public void onPostExecute(IResponse response) {
                     return;
                 }
                 Map<String, List<String>> headers = response.getHeaders();
+                if (headers == null) {
+                    return;
+                }
                 Log.i(LOG_TAG, "Got headers: "+ headers.toString());
+                if (headers.get("Location") == null) {
+                    return;
+                }
                 String locationUrl = headers.get("Location").get(0);
+                if (locationUrl == null || locationUrl.length() < 1) {
+                    return;
+                }
                 String[] parts = locationUrl.split("/");
+                if (parts.length < 2) {
+                    return;
+                }
                 String tag = parts[parts.length-1];
+                if (tag.length() < 2) {
+                    return;
+                }
                 String latestVersion = tag.substring(1); // strip the 'v' from the beginning
 
                 String installedVersion = PackageUtils.getAppVersion(activity);
@@ -129,7 +144,7 @@ private void showUpdateDialog(final Context context,
         msg = String.format(msg, installedVersion, latestVersion);
 
         if (installedVersion.startsWith("0.") &&
-                latestVersion.startsWith("1.")) {
+           latestVersion.startsWith("1.")) {
             // From 0.x to 1.0 and higher, the keystore changed
             msg += " " + context.getString(R.string.must_uninstall_to_update);
         }