custom-node-sp-auth - nodejs to SharePoint unattended http authentication

Project forked from: https://github.com/s-KaiNet/node-sp-auth

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#### Install:
``bash
npm install @lucaselb/node-sp-auth --save-dev
`
#### Create authentication headers and perform http request:

`javascript
import * as spauth from '@lucaselb/node-sp-auth';
import * as request from 'request-promise';

//get auth options
spauth.getAuth(url, credentialOptions)
.then(options => {

//perform request with any http-enabled library (request-promise in a sample below):
let headers = options.headers;
headers['Accept'] = 'application/json;odata=verbose';

request.get({
url: 'https://[your tenant].sharepoint.com/sites/dev/_api/web',
headers: headers
}).then(response => {
//process data
});
});
`

API:

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#### return value:
Promise resolving into object with following properties:
- headers - http headers (normally contain Authorization header, may contain any other heraders as well)
- options - any additional options you may need to include for succesful request. For example, in case of on premise user credentials authentication, you need to set agent property on corresponding http client

#### params:
- url - required, string, url to SharePoint site, https://sp2013/sites/dev/ or https:/[your tenant].sharepoint.com/sites/dev/
- credentialOptions - optional, object in a form of key-value. Each authentication option requires predefined credential object, depending on authentication type. Based on credentials provided, node-sp-auth automatically determines which authentication strategy to use (strategies listed in the top of the readme file).

Possible values for credentialOptions (depending on authentication strategy):

- SharePoint on premise (2013, 2016):
- Addin only permissions:
clientId, issuerId, realm, rsaPrivateKeyPath, shaThumbprint
- User credentials through the http ntlm handshake:
username, password, domain, workstation
- User credentials for form-based authentication (FBA):
username, password, fba = true
- User credentials for Forefront TMG (reverse proxy):
username, password, tmg = true

- SharePoint Online:
- Addin only permissions:
clientId, clientSecret
- SAML based with user credentials
username , password, online

- ADFS user credentials:
username, password, relyingParty, adfsUrl, adfsCookie
- On demand authentication
ondemand = true, electron, force, persist, ttl
- no authentication - do not provide any authentication data at all, like spauth.getAuth(url).then(...). In that case node-sp-auth will ask you for the site url and credentials. You will have to select any of the credential options listed above. Credentials will be stored in a user folder in an encrypted manner.
Credits: Andrew Koltyakov @koltyakov and his awesome node-sp-auth-config

Please, use Wiki to see how you can configure your environment in order to use any of this authentication options.

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#### params:
- configuration - object accepting some configuration values for node-sp-auth. Currently it supports only configuration of underline request module via providing below code (for options available consider request repository):
`typescript
spauth.setup({
requestOptions: {... request options object}
});
``