sanction is a lightweight, dead simple client implementation of the OAuth2 protocol. The major goals of the library are: Support multiple providers -------------------------- Most providers have varying levels of diversion from the official spec. The goal with this library is to either handle these diversions natively, or expose a method to allow client code to deal with it efficiently and effectively. Support all server-side OAuth2 flows ------------------------------------ Three of the four OAuth2 flows should be supported by this library. Currently, only authorization code and client credential flows have been tested due to lack of other (known) implementations. sanction has been tested (lightly) with the following OAuth2 providers and provides sample code for each: Facebook (include the test API) Google Foursquare bitly GitHub StackExchange Instagram https://github.com/demianbrecht/sanction