Registering and using extensions
Extensions can be registered, making it easier to use the same extensions in multiple schemas, supply snippets for common parameters and edit the extension's URL. On this page we'll show you how to register an extension, configure which permissions it is granted, specify installation parameters, add snippets and add an extension in the schema editor.
On this page
Registering extensions
To register an extension, go the development home page and click the extensions icon, or choose "Extensions" from the Development menu.
Note that users must have the developer persona in order to have permission to register and manage extensions.
A list of your registered extensions will be displayed, or if no extensions have been registered you'll see a message as shown below. Click the "Register extension" button.
In the registration window, add a label and name. The label is used to identify the extension in the Add extension menu in the schema editor. The name will be used as the value of the "name" field in the ui:extension section of a property that uses the extension.
"type": "number",
"ui:extension": {
"name": "simple-slider",
...
Next you need to add the extension URL and a short description that will be used to provide information when adding the extension to a content type or slot schema. The initial height of the frame within which the extension is displayed defaults to 200 pixels, but you can change this value if you wish.
When all this information is added, click "Save" and the extension will be registered on the hub and available to use with the schema editor.
Permissions
From the permissions (1 in the image below) section you can specify two sets of permissions: API permissions and Sandbox permissions.
All permissions will initially be set to off by default and are configured per extension and for the current user. The user controls which permissions are set for an extension, the extension cannot modify which permissions it is granted.
API permissions
The API permissions allow you to grant this extension permission to access the Dynamic Content Management API. You can choose to enable "Read access" ("GET" methods) and "Modify access" (all other methods). If you leave these permissions set to off, then the extension will be denied access to the API. Even if the extension is granted access to the API, the user must also have the appropriate API permissions.
Sandbox permissions
Extensions are loaded into an iFrame which has the sandbox attribute set. This attribute enforces restrictions on the iFrame content.
You can choose to remove some sandbox restrictions from the sandbox permissions section. These are standard sandbox attributes supported by Chrome, Safari and Firefox. Note that not all browsers may support all of these sandbox attributes.
The available permissions are shown in the table below.
| Permission | Description |
|---|---|
| allow-same-origin | If this is not enabled, then any requests sent by the extension will be treated as being from a special origin and will fail the same origin policy. |
| allow-modals | Allow the extension to open modal windows. |
| allow-top-navigation | Allow the extension to navigate the top level browsing context. |
| allow-popups | Allow the extension to create pop ups, using window.open(), target="_blank", or showModalDialog(). If this permission is not set, then the popups will fail silently. |
| allow-popups to escape sandbox | Allow popups to open new windows without inheriting the sandboxing. |
| allow-downloads | Allow downloads triggered by a user action. |
| allow-forms | Allow the extension to submit forms. If this permission is not set, then form submission will be blocked. |
Including the extension URL in your content type schema
Permissions are only available to registered extensions. If you are including the extension URL in your schema instead of registering it, then your extension will not be granted any permissions.
Installation parameters
In the installation parameters section you can enter values for API keys and other information that you want to apply to an extension each time it's used and don't want to specify in the schema. This is particularly useful if your extension accesses a 3rd party service that requires authorisation.
Installation params are different to the params that are specified in a schema (and that you usually include in snippets). In the example of a code editor you might want installation params to include display settings that are applied each time the extension is used, while schema params could include settings that vary according to the language.
Adding snippets
Adding one or more snippets makes it easier to add your extension to a property in the schema editor, as well as specifying common initial values for parameters. To add a snippet, click "Add Snippet", add a label and paste the JSON for the snippet into the window.
When you choose a snippet in the schema editor, it is used to add a property that uses the extension to the schema.
For the slider extension we've added two snippets with different values for the params.
An example snippet is shown below. Note that the extension name should match the name that the extension was registered with.
{
"title": "transitiontime",
"description": "Choose the transition time in seconds",
"type": "number",
"ui:extension": {
"name": "simple-slider",
"params": {
"min": 0,
"max": 10,
"value": 5
}
},
"minimum": 0,
"maximum": 10
}
When you've finished adding your snippets, save your changes and click the Back button at the top of the window to return to the Extensions window. The extension you just added will be shown in the list.
To edit an existing extension, double-click its name in the list or choose "View" from its contextual menu.
Adding an extension in the schema editor
There are two ways of adding a registered extension to a schema property using the schema editor. The first and easiest approach is to use one of the snippets we set up when we registered the schema.
If you have any extensions with snippets registered on your hub, then an "Add extension" menu is shown in the schema editor. In here you'll find all the snippets for all the extensions you've registered.
For this example we'll choose "Standard params" which will add the snippet shown above.
A new property is added to the schema editor, including your chosen snippet. This includes a default property name and the title, description, property type and params from the snippet. A preview of the property is shown in the window on the right hand side and we can see the slider extension set up with the params we provided.
Another way of adding an extension to a property is to use the schema editor's auto complete suggestions. If you add the "ui:extension" keyword and then add "name" within this, pressing control-space will bring up a list of registered extensions from which to choose. In the example shown below we're adding the slider.
If you wanted to specify params you'd need to add them to the properties as shown below.
"transitiontime": {
"title": "transitiontime",
"description": "Choose the transition time in seconds",
"type": "number",
"ui:extension": {
"name": "simple-slider",
"params": {
"min": 0,
"max": 10,
"value": 5
}
},
"minimum": 0,
"maximum": 10
}