Use http://passportjs.org/ and https://github.com/jaredhanson/passport-oauth to provide OAuth2 based authentication to Etherpad lite from Mattermost.
In your etherpad-lite dir:
npm install ep_oauth_mattermostConfigure your backend using settings.json or environment variables.
Either add to settings.json:
"mattermost_oauth": {
"enabled":true,
"clientId":"CLIENTID",
"clientSecret":"CLIENTSECRET",
"serverUrl":"https://MATTERMOSTURL.com",
"authEndpoint":"/oauth/authorization",
"userInfoEndpoint":"/api/v4/users/me",
"tokenEndpoint":"/oauth/access_token",
"idField":"Field to use for id",
"usernameField":"Field to use for username",
"redirectUrl":"URL for your site"
}or define the following environment variables:
OAUTH2_ENABLED =
OAUTH2_CLIENT_ID =
OAUTH2_CLIENT_SECRET =
OAUTH2_SERVER_URL =
OAUTH2_AUTH_ENDPOINT =
OAUTH2_USERINFO_ENDPOINT =
OAUTH2_TOKEN_ENDPOINT =
OAUTH2_ID_FIELD =
OAUTH2_USERNAME_FIELD =
OAUTH2_REDIRECT_URL = MIT