Question

Mendeley has a great API (in fact they have put up a contest using their API, this question is not specific to that though), that uses OAuth.

I am trying to write a strategy to allow Mendeley Authentication, and am having quite a bit of trouble doing so..

I go to /auth/mendeley, it redirects me to Mendeley.com, I authenticate, then it redirects me to a page with nothing on it but this

{“error”:”Consumer key not found”}

They mention this is a 3 leg OAuth, is that something that requires an extra step than what OAuth typically does?

Here is what I have:

# /config/initializers/omniauth.rb

module OmniAuth
  module Strategies
    # tell omniauth to load the strategy
    autoload :Mendeley, 'lib/mendeley'
  end
end

# gather oauth credentials from the yml file
OAUTH = YAML.load_file(File.join(Rails.root, "config", "oauth.yml"))

# load all the possible oauth strategies
ActionController::Dispatcher.middleware.use OmniAuth::Builder do
  provider OmniAuth::Strategies::Mendeley, OAUTH['mendeley']['consumer_key'], OAUTH['mendeley']['consumer_secret']
end

 

# lib/mendeley.rb

require 'omniauth/oauth'
require 'multi_json'

module OmniAuth
  module Strategies

    # Omniauth strategy for using oauth2 and mendeley.com

    class Mendeley < OAuth2
      def initialize(app, consumer_key = nil, consumer_secret = nil, &block)
        client_options = {
          :site => 'http://api.mendeley.com'
        }

        super(app, :mendeley, consumer_key, consumer_secret, client_options, &block)
      end
    end
  end
end

Answer 1

Did it myself – Pull request: https://github.com/intridea/omniauth/pull/587/files#diff-13