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Templates

When new functionality is introduced to the hosted login pages, new theme templates are occasionally added. They are added to the default theme by the upgrade process but if you’ve customized your theme to fit your brand, you’ll need to modify the theme to have the new template.

In the version release notes, any new templates and macros are documented. If there are changes, you’ll want to take a closer look at the themes post upgrade.

As part of your upgrade testing, open the administrative user interface and navigate to Customizations > Themes.

If any themes are missing templates, they will show as "Upgrade Required". Port the new theme files over to your custom theme, modify them as needed, and save the theme.

In some cases, existing templates are modified. If you have customized your theme, you’ll need to compare the new template to your existing version’s base theme and port over any changes to your customized theme. The easiest way to do this is to use a diff tool to compare the two sets of files. Here is a suggested process to follow before you upgrade:

  1. Download the default theme from your existing version of FusionAuth.

  2. Download the default theme from the new version of FusionAuth.

  3. Use a diff tool to compare the two sets of files.

  4. Apply any differences to your customized theme.

You can use the Theme Helper to help with this process.

Using the Theme Helper to Upgrade Themes

Clone the Theme Helper repo and follow the install instructions in the README.md file.

Download the base themes from your existing version of FusionAuth and the new version of FusionAuth to compare.

To get the existing version’s theme files, create a .env file from the .env.sample file. Create an API key with read permissions for Themes in the FusionAuth administrative user interface. Add the API key to the .env file. The FusionAuth default theme has the same ID 75a068fd-e94b-451a-9aeb-3ddb9a3b5987 across all instances. Use this value to update the THEME_ID key in the .env file.

In the .env file, set the FUSIONAUTH_URL to the URL of your existing FusionAuth instance. Finally, update the TMP_DIR to a directory on your local machine where you want the existing theme files to be downloaded, such as current-theme.

Now you can run the download.sh script to download the existing theme files to the TMP_DIR directory.

Once the download is complete, you’ll need to get the base theme files from the new version of FusionAuth. The easiest way to do this is to install the new version of FusionAuth on your local machine or a VM using Docker. Instructions for installing FusionAuth using Docker can be found in the FusionAuth Docker Installation Guide.

Once you’ve got the new version of FusionAuth running, you can update the Theme Helper .env file in the Theme Helper repo to point to the new version of FusionAuth. If running locally, update the FUSIONAUTH_URL to http://localhost:9011.

Log in to the new version of FusionAuth to create an API key and copy the default theme ID 75a068fd-e94b-451a-9aeb-3ddb9a3b5987 into the THEME_ID variable as you did for the existing version. Finally, update the TMP_DIR to a directory on your local machine where you want the new theme files to be downloaded, such as new-theme. Make sure it is a different directory than the one you used for the existing theme files.

Now you can run the download.sh script again to download the new theme files to the TMP_DIR directory.

Once you have both sets of theme files downloaded, you can run the diff-themes.sh script to compare the two sets of files. The script takes two arguments: the path to the existing theme files and the path to the new theme files. For example:

./diff-themes.sh current-theme new-theme

The script will output a list of files that show differences between the two sets of theme files and the differences. You can use this list to update your customized theme files. While you can directly use this output to find the changes, it might be useful to use a visual diff tool to help you make the changes, using the file list as a guide.

Messages

When new functionality is introduced to the hosted login pages, new theme message keys are sometimes required. They are added to the default theme messages file by the upgrade process.

However, if you have customized your theme, the new keys are not added to that modified theme. The first time you try to modify your theme, you’ll receive an error message similar to the text below:

Missing required keys. See text area below for default English translations. To continue, please copy the values from below into the Messages text area.

FusionAuth warns you about missing required keys in order to avoid an inadvertent bad user experience. The default display for keys with no valid values in theme Messages is the key text, such as [ExternalAuthenticationException]LinkedInToken, which can be confusing for end users.

During an upgrade, you can find these keys by testing the upgrade on a development instance or comparing releases in the fusionauth-localization repo. You can safely add these new key values to your theme prior to an upgrade. Any unused messages in a theme’s messages file are silently ignored (unless malformed).

The extra lines won’t do any harm and will ensure an excellent end-user experience if a user stumbles on new functionality right after an upgrade.