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Embed a Chart Authenticated with Realm

Note

For the purposes of this tutorial, the names Realm and Stitch are used interchangably. They both refer to the MongoDB platform as a service.

MongoDB Realm is a serverless platform that enables developers to quickly build applications without having to set up server infrastructure. Realm offers several authentication options, including Google OAuth, Facebook Login, and email/password. You can use the authentication mechanism from a Realm app to control data access for an embedded chart.

This tutorial shows you how to:

  • Enable authenticated embedding for a chart.
  • Use the Embedding SDK to embed a chart authenticated by a custom Realm provider.
  • Use your Realm app to control the data in your embedded chart.
Note

This tutorial does not cover creating a Realm app with authentication. See the Realm documentation for app creation tutorials.

  • You must be an Atlas Project Owner to configure embedding authentication providers for your linked Charts instance.
  • You must have a chart which uses your Realm app's backing database as its data source. For more information about creating a chart, see Build Charts.

Enable authenticated embedding to generate a Charts Base URL and a chart ID. You will need your Charts Base URL and chart ID to display your chart on a web page.

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From your dashboard page, select the dashboard containing the chart you wish to embed.

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From the dashboard, click at the top-right of the chart to access its embedding information. Select Embed Chart from the dropdown menu.

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If you have already enabled external sharing on the data source this chart uses, skip this step. If you haven't yet enabled embedding on the data source, you can do so now. Click the Configure external sharing link.

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Embed authenticated chart
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You can specify a function to inject a MongoDB filter document for each user who views the chart. This is useful for rendering user-specific charts.

Example

The following filter function only renders data where the ownerId field of a document matches the value of the Embedding Authentication Provider's token's sub field:

function getFilter(context) {
return { ownerId: context.token.sub };
}
Tip
See also:

To learn more about injecting filters per user, see Inject User-Specific Filters.

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Specify the fields on which chart viewers can filter data. By default, no fields are specified, meaning the chart cannot be filtered until you explicitly allow at least one field.

Tip
See also:

To learn more about filterable fields, see Specify Filterable Fields.

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Use these values in your application code together with your Embedded Authentication Provider attributes to embed your chart.

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  1. If Charts is not already displayed, click Charts in the navigation bar.
  2. Click Charts Settings in the sidebar.
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In addition to authenticating users for embedded chart access, you can perform fine-grained data access control with your Realm app's service rules. Set the toggle switch to On if you want to enable rule enforcement.

When this option is enabled, any Realm rules defined on collections will be observed by Charts when retrieving chart data. You can use this feature to restrict access to the data shown on your chart, including showing different subsets of data to different users, depending on their role.

Note
  • This option assumes that the data source for this chart uses the same MongoDB database and collection as your Realm app.
  • Using this option may have a performance impact, so you should leave it off if you do not need to restrict data access based on Realm rules.
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Enter the name of the service in your Realm app that fetches data from MongoDB. To find the name of your data service:

  1. Navigate to your Realm app.
  2. Click Clusters in the sidebar navigation.
  3. The service name is listed under Stitch Service Name.
9

If you already have an app in which to display your chart, you're ready to add an embedded chart. If not, proceed with the remaining steps to create a new app.

MongoDB offers a pre-built example app that shows how to use the Embedding SDK to display an embedded chart using Realm authentication.

Clone the GitHub repository and follow the instructions in the Readme file to begin using the app. You can run the app as-is, or you can customize it to use the chart you created earlier.

Note

The example app assumes that your Realm app uses email/password authentication. If your Realm app uses another authentication mechanism, the example app will require additional customization.

All the lines you need to edit are marked with a comment containing ~REPLACE~.

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The file index.js is located in the src directory.

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Replace the existing Realm App ID with your Realm App ID, which you can find on the left side of your Realm app UI.

const client = Stitch.initializeAppClient(
'realm-authentication-sample-eibkj', // Optional: ~REPLACE~ with your Realm App ID
{
3

Replace the existing Charts Base URL with the Base URL of the chart you want to display. Your Charts Base URL is visible in the embedding options modal window. See Embed Charts with the Embedding SDK for detailed instructions on enabling embedding for a chart.

const sdk = new ChartsEmbedSDK({
baseUrl: "https://charts-dev.mongodb.com/charts-test2-pebbp", // Optional: ~REPLACE~ with your Charts URL
getUserToken: () => getRealmUserToken(client),
});

Note the getRealmUserToken() function in the code snippet above, which returns the JWT from the existing Realm authentication session. getRealmUserToken() must be imported from the Embedding SDK, as you can see in the import statement on line 2 of the example app:

import ChartsEmbedSDK, { getRealmUserToken } from "@mongodb-js/charts-embed-dom";

You can also include the Embedding SDK with inline Javascript in an HTML page, as shown in the following code snippet:

<script src="https://s3.amazonaws.com/stitch-sdks/js/bundles/4.6.0/stitch.js"></script>
<script src="https://unpkg.com/@mongodb-js/charts-embed-dom"></script>

To use the getRealmUserToken() function in this scenario, import it from the SDK:

ChartsEmbedSDK.getRealmUserToken()
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Replace the existing chart ID with the ID of the chart you want to display. Your chart ID is visible in the embedding options modal window. See Embed Charts with the Embedding SDK for detailed instructions on enabling embedding for a chart.

const chart = sdk.createChart({
chartId: "a2e775e6-f267-4c2c-a65d-fbf3fad4a4f2", // Optional: ~REPLACE~ with your Chart ID
});

After you finish customizing the app, it's ready to run.

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