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https://github.com/aserto-dev/aserto-spa-js

Aserto single-page application javascript SDK
https://github.com/aserto-dev/aserto-spa-js

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Aserto single-page application javascript SDK

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# Aserto single-page application JavaScript SDK

Loosely modeled after the [Auth0 SPA SDK](https://github.com/auth0/auth0-spa-js).

## Installation

Using [npm](https://npmjs.org):

```sh
npm install @aserto/aserto-spa-js
```

Using [yarn](https://yarnpkg.com):

```sh
yarn add @aserto/aserto-spa-js
```

## Getting Started

### Creating the client

Create an `AsertoClient` instance before rendering or initializing your application. You should only have one instance of the client.

You need a valid access token before you can instantiate the client. For
the next few examples, the `accessToken` variable is assumed to contain a
valid access token.

To obtain one via Auth0 (for example), use code like this:

```js
// get a valid access token, e.g. from Auth0 getTokenSilently()
import createAuth0Client from '@auth0/auth0-spa-js';
const auth0 = await createAuth0Cient(
domain: '',
client_id: '',
redirect_uri: ''
);
const accessToken = await auth0.getTokenSilently();
```

Create an `AsertoClient` in the following way:

```js
import createAsertoClient from '@aserto/aserto-spa-js';

const aserto = await createAsertoClient({
accessToken: accessToken, // valid access token
serviceUrl: 'https://service-url', // defaults to window.location.origin
policyRoot: 'policyRoot', // policy root specified in the policy manifest
endpoint: '/__displaystatemap' // access map endpoint, defaults to /__displaystatemap
});

// or you can just instantiate the client on its own
import { AsertoClient } from '@aserto/aserto-spa-js';

const aserto = new AsertoClient({
accessToken: accessToken,
serviceUrl: 'https://service-url', // defaults to window.location.origin
policyRoot: 'policyRoot', // policy root specified in the policy manifest
endpoint: '/__displaystatemap' // access map endpoint, defaults to /__displaystatemap
});

// explicitly load
await aserto.reload();
```

## Usage

### createAsertoClient(options, body)

Create an `AsertoClient` with the `options` provided, and pass the optional `body`
to the `reload(body)` call that initializes the client.

### displayStateMap()

Retrieves a JavaScript object that holds the display state map

```js
console.log(aserto.displayStateMap());
```

### getDisplayState('method', 'path', 'policyRoot')

Retrieves the display state associated with a specific resource.

By convention, the `method` argument is an HTTP method (GET, POST, PUT, DELETE), and the `path` argument is in the form `/path/to/resource`. It may contain a `__id` component to indicate an parameter - for example, `/mycars/__id`.

When both `method` and `path` are provided, the key into the `displayStateMap` is
constructed as `//`. If the optional `policyRoot` argument is
provided, it overrides the `policyRoot` argument passed to `init()`.

Finally, if only the `method` argument is passed in, it is assumed to be a key into the `displayStateMap` (typically in the form of `//`).

The returned map will be in the following format:
```js
{
visible: true,
enabled: false,
}
```

Check whether a verb / path combination is visible and enabled:
```js
const method = 'GET';
const path = '/api/path';
const displayState = aserto.getDisplayState(method, path));
const isVisible = displayState.visible;
const isEnabled = displayState.enabled;
```

Log the display state values for each verb for the path:
```js
const path = '/api/path';
for (const verb of ['GET', 'POST', 'PUT', 'DELETE']) {
const resource = aserto.getDisplayState(verb, path));
for (const value of ['visible', 'enabled']) {
console.log(`${verb} ${path} ${value} is ${resource[verb][value]}`);
}
}
```

### reload(body, headers)

If the `body` parameter is supplied, it is passed as the body of the POST call to
the `__displaystatemap` API.

If the `headers` parameter is supplied, these are provided as headers to the POST call to
the `__displaystatemap` API.