Last.fm strategy for OmniAuth 1.0.

Add to your Gemfile:

gem 'omniauth'
gem 'omniauth-lastfm'

Then bundle install.

You'll need an API account with Last.fm, you can get one here - http://www.last.fm/api.

Usage of the gem is very similar to other OmniAuth 1.0 strategies. You'll need to add your API keys to config/initializers/omniauth.rb:

Rails.application.config.middleware.use OmniAuth::Builder do
  provider :lastfm, "consumer_key", "consumer_secret"
end

Now simply follow the README at: https://github.com/intridea/omniauth.

Here's an example auth hash, available in request.env['omniauth.auth']:

{
   "provider": "lastfm",
   "uid": "ripuk",
   "info": {
      "nickname": "ripuk",
      "name": "David Stephens",
      "url": "http://www.last.fm/user/ripuk",
      "image": "http://userserve-ak.last.fm/serve/252/46787679.jpg",
      "country": "UK",
      "age": "31",
      "gender": "m"
   },
   "credentials": {
      "token": "abcdefghijklmnop",
      "name": "ripuk"
   },
   "extra": {
      "raw_info": {
         "name": "ripuk",
         "realname": "David Stephens",
         "image": [
            {
               "#text": "http://userserve-ak.last.fm/serve/34/46787679.jpg",
               "size": "small"
            },
            {
               "#text": "http://userserve-ak.last.fm/serve/64/46787679.jpg",
               "size": "medium"
            },
            {
               "#text": "http://userserve-ak.last.fm/serve/126/46787679.jpg",
               "size": "large"
            },
            {
               "#text": "http://userserve-ak.last.fm/serve/252/46787679.jpg",
               "size": "extralarge"
            }
         ],
         "url": "http://www.last.fm/user/ripuk",
         "id": "25400308",
         "country": "UK",
         "age": "31",
         "gender": "m",
         "subscriber": "0",
         "playcount": "11530",
         "playlists": "0",
         "bootstrap": "0",
         "registered": {
            "#text": "2009-12-30 00:53",
            "unixtime": "1262134389"
         },
         "type": "user"
      }
   }
}

The Rockstar Gem is a great way to make use of the auth token retrieved with this gem.