Notification Digesting

plugins/talk-plugin-notifications/server/digests.js

@@ -0,0 +1,60 @@
+const { get, flatten } = require('lodash');
+const { getNotificationBody } = require('./util');
+
+const QUEUE_DIGEST_NOTIFICATION_QUERY = `
+  query CheckDigest($userID: ID!) {
+    user(id: $userID) {
+      notificationSettings {
+        digestFrequency
+      }
+    }
+  }
+`;
+
+// checkDigests will return a boolean indicating if the user has digesting
+// enabled.
+const checkDigests = async (ctx, userID) => {
+  const { data, errors } = await ctx.graphql(QUEUE_DIGEST_NOTIFICATION_QUERY, {
+    userID,
+  });
+  if (errors) {
+    ctx.log.error(
+      { err: errors },
+      'could not check the digest status of the user, skipping notifications'
+    );
+    return;
+  }
+
+  return get(data, 'user.notificationSettings.digestFrequency') !== 'NONE';
+};
+
+// renderDigestMessage will render the notification body value for a digest
+// message. It expects that the digestCategories are parsed into a list grouped
+// by category with the handler available.
+const renderDigestMessage = async (ctx, flattenedDigestCategories) => {
+  // Render the messages in this format:
+  //
+  // [{handler, notifications: [{ context }, ...]}, ...]
+  //
+  // To:
+  //
+  // [['body', 'body'], ['body']]
+  //
+  const notifications = await Promise.all(
+    flattenedDigestCategories.map(async ({ handler, notifications }) =>
+      Promise.all(
+        notifications.map(async ({ context }) =>
+          getNotificationBody(ctx, handler, context)
+        )
+      )
+    )
+  );
+
+  // Flatten the array of categories:
+  //
+  // [[..., ...], [..., ...], ...] -> [..., ..., ...]
+  //
+  return flatten(notifications);
+};
+
+module.exports = { renderDigestMessage, checkDigests };