From adcaf2aa48d0453f231268f5db168376c08e4e6b Mon Sep 17 00:00:00 2001
From: Shin'ya Ueoka <ueokande@i-beam.org>
Date: Fri, 1 Sep 2017 11:40:24 +0900
Subject: message passing by helper functions

---
 src/shared/messages.js | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
 create mode 100644 src/shared/messages.js

(limited to 'src/shared/messages.js')

diff --git a/src/shared/messages.js b/src/shared/messages.js
new file mode 100644
index 0000000..517fc4c
--- /dev/null
+++ b/src/shared/messages.js
@@ -0,0 +1,19 @@
+const receive = (win, callback) => {
+  win.addEventListener('message', (e) => {
+    let message;
+    try {
+      message = JSON.parse(e.data);
+    } catch (e) {
+      // ignore message posted by author of web page
+      return;
+    }
+
+    callback(message);
+  })
+}
+
+const send = (win, message) => {
+  win.postMessage(JSON.stringify(message), '*');
+}
+
+export { receive, send };
-- 
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