Office JavaScript API Helpers

A collection of helpers to simplify development of Office Add-ins & Microsoft Teams Tabs. These helpers address features as Storage Management, Authentication, Dialogs and other helpful utilities etc.

The current version includes the following helpers:

• Authentication
• Dialogs
• Error Logging
• Storage Helpers
• Dictionary

Getting Started

Installation

Development

This assumes you are using npm as your package manager.

To install the stable version:

npm install --save @microsoft/office-js-helpers

Production

You can access these files on unpkg, download them, or point your package manager to them.

You can also get the latest version from the releases tab

Usage

JavaScript

Reference the library inside of your .html page using:

<!-- Office.js -->
<script src="https://appsforoffice.microsoft.com/lib/1/hosted/office.js"></script>

<!-- ES6 Shim of your choice -->
<script src="https://unpkg.com/core-js/client/core.min.js"></script>

<!-- Office JavaScript API Helpers (via CDN) -->
<script src="https://unpkg.com/@microsoft/office-js-helpers@0.6.3/dist/office.helpers.min.js"></script>

<!-- Office JavaScript API Helpers (via npm) -->
<script src="node_modules/@microsoft/office-js-helpers/dist/office.helpers.min.js"></script>

<!-- Office JavaScript API Helpers (via local) -->
<script src="office.helpers.js"></script>

TypeScript

If you are just referencing the library using a script tag then make sure to set your moduleResolution to node in your tsconfig.json to pickup the intellisense automatically. You will need to install the package via npm install @microsoft/office-js-helpers.

We will publish to DefinitelyTyped soon and then you can directly use typings to get access to the definitions.

If you are using any dependency loader such as RequireJS or SystemJS or module bundler such as browserify, webpack, you can use TypeScript import syntax to import specific modules. For e.g.

import * as OfficeHelpers from '@microsoft/office-js-helpers';

import {Authenticator, DefaultEndpoints} from '@microsoft/office-js-helpers';

import {Authenticator, Storage} from '@microsoft/office-js-helpers';

import {Authenticator} from '@microsoft/office-js-helpers';

Helpers

Authentication

The Authentication helper is built for standards compliant OAuth Implicit Flow. Out of the box it directly integrates with Microsoft, AzureAD, Google and Facebook authentication.

Microsoft integration uses the AzureAD AppModel v2 endpoints which uses Converged Authentication. It enables users to login using their Work, School or Personal accounts.

Note on MSAL. This helper isn't a replacement for MSAL. When MSAL for JavaScript is released publicly, the helper will use MSAL.

For Office Add-ins

You need to meet the following requirements before you are able to successfully to use the Authenticator inside of Office Add-ins.

1. You need to use https. This is important as we are using OAuth Implicit Flow and it is critical to secure the communication over the wire.
2. Add the location of the provider in your AppDomains, example:

    <AppDomain>https://login.windows.net</AppDomain>
    <AppDomain>https://login.microsoftonline.com</AppDomain>

Setup

Inside of your Office.initialize function add the following check:

if (OfficeHelpers.Authenticator.isAuthDialog()) return;

This to inform the Authenticator to automatically close the authentication dialog once the authentication is complete.

Note: This code needs to be run in the page that is redirected to from the provider. By default we assume the root url of your website. The code ensures that if an access_token, code or error was received inside of the dialog, then it will parse it and close the dialog automatically. Also as an additional step it ensures that the state sent to the provider is the same as what was returned, to prevent Cross Site Request Forgery (CSRF).

Note: If using in an AngularJS/Angular/React project - please take a look OfficeDev#19 for information around bootstrapping your application correctly.

Initialize

Create a new instance of Authenticator and register the endpoints. An endpoint corresponds to a service that allows the user to authenticate with.

var authenticator = new OfficeHelpers.Authenticator();

// register Microsoft (Azure AD 2.0 Converged auth) endpoint using
authenticator.endpoints.registerMicrosoftAuth('client id here');

// register Azure AD 1.0 endpoint using
authenticator.endpoints.registerAzureADAuth('client id here', 'tenant here');

// register Google endpoint using
authenticator.endpoints.registerGoogleAuth('client id here');

// register Facebook endpoint using
authenticator.endpoints.registerFacebookAuth('client id here');

// register any 3rd-Party OAuth Implicit Provider using
authenticator.endpoints.add('Name of provider', { /* Endpoint Configuration */ })

// register Microsoft endpoint by overriding default values
authenticator.endpoints.registerMicrosoftAuth('client id here', {
    redirectUrl: 'redirect url here',
    scope: 'list of valid scopes here'
});

Authentication

To authenticate against the registered endpoint, do the following:

authenticator
    .authenticate('name of endpoint')
    .then(function(token) { /* handle success here */ })
    .catch(OfficeHelpers.Utilities.log);

// for the default Microsoft endpoint
authenticator
    .authenticate(OfficeHelpers.DefaultEndpoints.Microsoft)
    .then(function (token) { /* Microsoft Token */ })
    .catch(OfficeHelpers.Utilities.log);

// for the default AzureAD endpoint
authenticator
    .authenticate(OfficeHelpers.DefaultEndpoints.AzureAD)
    .then(function (token) { /* Microsoft Token */ })
    .catch(OfficeHelpers.Utilities.log);

// for the default Google endpoint
authenticator
    .authenticate(OfficeHelpers.DefaultEndpoints.Google)
    .then(function (token) { /* Google Token */ })
    .catch(OfficeHelpers.Utilities.log);

// for the default Facebook endpoint
authenticator
    .authenticate(OfficeHelpers.DefaultEndpoints.Facebook)
    .then(function (token) { /* Facebook Token */ })
    .catch(OfficeHelpers.Utilities.log);

If the user, rejects the grant to the application then you will receive an error in the catch function.

Getting a cached token

By default the tokens are cached to the LocalStorage and upon expiry the AuthDialog is invoked again. You can also pass the force parameter as true as the second input to authenticator.authenticate() to re-authenticate the user.

authenticator
    .authenticate('name of endpoint')
    .then(function(token) {
    /*
        `token` is either cached or newly obtained upon expiry.
    */
    })
    .catch(OfficeHelpers.Utilities.log);

authenticator
    .authenticate('name of endpoint', true /* force re-authentication */)
    .then(function(token) {
    /*
        `token` is newly obtained.
    */
    })
    .catch(OfficeHelpers.Utilities.log);

// get the cached token if any. returns null otherwise.
var token = authenticator.tokens.get('name of endpoint');

If a cached token expires, then the dialog is automatically launched to re-authenticate the user.

Note on Refresh Tokens: By default, Implicit OAuth does not support Token Refresh as a security measure. This is because Access Tokens cannot be securely stored inside of a JavaScript client.

Contributing

Please read Contributing for details on our code of conduct, and the process for submitting pull requests to us.

Versioning

We use SemVer for versioning. For the versions available, see the tags on this repository.

License

This project is licensed under the MIT License - see the License file for details