README

Wordpress plugin that adds preview and other integrations with Gatsby.

How to install

If you want to use this plugin as an MU-plugin, first add this to your composer.json:

{
  "extra": {
    "installer-paths": {
      "path/to/your/mu-plugins/{$name}/": [
        "whitespace-se/wordpress-plugin-gatsby"
      ]
    }
  }
}

Where path/to/your/mu-plugins is something like wp-content/mu-plugins or web/app/mu-plugins.

Then get the plugin via composer:

composer require whitespace-se/wordpress-plugin-gatsby

Configuration

Preview

Define the GATSBY_PREVIEW_ENDPOINT constant in you config (e.g. in wp-config.php) to set up the preview, for example:

define("GATSBY_PREVIEW_ENDPOINT", "https://example.com/wp-preview");

This url will be appended with a query string containing these parameters:

• id – The GraphQL ID for the post
• user => The encrypted ID of the user that is previewing the post
• wpnonce => A wp_rest nonce
• contentType => The content type of the post (deprecated)

You should use GraphQL to request data for the preview and that request must contain the x-wp-user and x-wp-nonce headers, containing the values received in the query string.

The GraphQL query may look like this, where $id is the GraphQL ID for the post received in the query string:

query PreviewQuery($id: ID!) {
  wp {
    contentNode(id: $id, asPreview: true) {
      # ...
    }
  }
}

Refresh on save

Define the GATSBY_REFRESH_ENDPOINTS constant in you config (e.g. in wp-config.php) if you need to trigger a Gatsby refresh when posts are updated. Example:

define("GATSBY_REFRESH_ENDPOINTS", "http://localhost:8000/__refresh");

The value can be a single URL or multiple URLs either as an array or comma-separated in a single string. You can also use the gatsby_refresh_endpoints filter to alter the value.