1 files changed, 78 insertions, 0 deletions
diff --git a/assets/js/subscribe_widget.js b/assets/js/subscribe_widget.js
new file mode 100644
index 00000000..64e3e55f
--- /dev/null
+++ b/assets/js/subscribe_widget.js
@@ -0,0 +1,78 @@
+var subscribe_button = document.getElementById('subscribe');
+subscribe_button.parentNode['action'] = 'javascript:void(0)';
+
+if (subscribe_button.getAttribute('data-type') === 'subscribe') {
+    subscribe_button.onclick = subscribe;
+} else {
+    subscribe_button.onclick = unsubscribe;
+}
+
+function subscribe(timeouts = 0) {
+    if (timeouts > 10) {
+        console.log('Failed to subscribe.');
+        return;
+    }
+
+    var url = '/subscription_ajax?action_create_subscription_to_channel=1&redirect=false' +
+        '&c=' + subscribe_data.ucid +
+        '&referer=' + location.pathname + location.search;
+    var xhr = new XMLHttpRequest();
+    xhr.responseType = 'json';
+    xhr.timeout = 20000;
+    xhr.open('POST', url, true);
+    xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
+    xhr.send('csrf_token=' + subscribe_data.csrf_token);
+
+    var fallback = subscribe_button.innerHTML;
+    subscribe_button.onclick = unsubscribe;
+    subscribe_button.innerHTML = '<b>' + subscribe_data.unsubscribe_text + ' | ' + subscribe_data.sub_count_text + '</b>';
+
+    xhr.onreadystatechange = function () {
+        if (xhr.readyState == 4) {
+            if (xhr.status != 200) {
+                subscribe_button.onclick = subscribe;
+                subscribe_button.innerHTML = fallback;
+            }
+        }
+    }
+
+    xhr.ontimeout = function () {
+        console.log('Subscribing timed out.');
+        subscribe(timeouts + 1);
+    };
+}
+
+function unsubscribe(timeouts = 0) {
+    if (timeouts > 10) {
+        console.log('Failed to subscribe');
+        return;
+    }
+
+    var url = '/subscription_ajax?action_remove_subscriptions=1&redirect=false' +
+        '&c=' + subscribe_data.ucid +
+        '&referer=' + location.pathname + location.search;
+    var xhr = new XMLHttpRequest();
+    xhr.responseType = 'json';
+    xhr.timeout = 20000;
+    xhr.open('POST', url, true);
+    xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
+    xhr.send('csrf_token=' + subscribe_data.csrf_token);
+
+    var fallback = subscribe_button.innerHTML;
+    subscribe_button.onclick = subscribe;
+    subscribe_button.innerHTML = '<b>' + subscribe_data.subscribe_text + ' | ' + subscribe_data.sub_count_text + '</b>';
+
+    xhr.onreadystatechange = function () {
+        if (xhr.readyState == 4) {
+            if (xhr.status != 200) {
+                subscribe_button.onclick = unsubscribe;
+                subscribe_button.innerHTML = fallback;
+            }
+        }
+    }
+
+    xhr.ontimeout = function () {
+        console.log('Unsubscribing timed out.');
+        unsubscribe(timeouts + 1);
+    };
+}