Updated Readme

README.md

@@ -4,6 +4,8 @@ Instagram OAuth2 Strategy for OmniAuth.
 
 Supports OAuth 2.0 server-side flow with new Instagram Basic Display API and Long Live Tokens. Read the Instagram docs for more details: https://developers.facebook.com/docs/instagram-basic-display-api/guides/getting-access-tokens-and-permissions
 
+Inspired by [OmniAuth Strategy for Facebook](https://github.com/simi/omniauth-facebook).
+
 ## Installing
 
 Add to your `Gemfile`:
@@ -26,6 +28,57 @@ Rails.application.config.middleware.use OmniAuth::Builder do
 end
 ```
 
+## Configuring
+
+You can configure several options, which you pass in to the `provider` method via a `Hash`:
+
+| Option name                         | Default                              | Description                                                                                                                    |
+|-------------------------------------|--------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
+| `scope`                               | `'user_profile,user_media'`          | A comma-separated list of permissions you want to request from the user.                                                                                                                                                                                                  |
+| `info_fields`                         | `'account_type,id,media_count,username'` | A comma-separated list of fields should be returned when getting the user's info (see more https://developers.facebook.com/docs/instagram-basic-display-api/reference/user).                                                                                              |
+| `callback_url`                        |                                      | Specify a custom callback URL used during the server-side flow. Note this must be allowed by your app configuration on Facebook (see 'Valid OAuth redirect URIs' under the 'Basic Display' settings section in the configuration for your Facebook app for more details). |
+| `exchange_access_token_to_long_lived` | `true`                                 | Should `access_token` be exchanged to a Long-Lived token during callback phase of OmniAuth (see more about Long-Lived tokens here: https://developers.facebook.com/docs/instagram-basic-display-api/guides/long-lived-access-tokens)                                      |
+
+
+## Auth Hash
+
+Here's an example Auth Hash available in `request.env['omniauth.auth']`:
+
+```
+{
+  provider: 'instagram_graph',
+  uid: '1234567',
+  info: {
+    name: 'igor_alexandrov',
+    nickname 'igor_alexandrov'
+  },
+  credentials: {
+    token: 'ABCDEF...', # OAuth 2.0 access_token, which you may wish to store
+    expires_at: 1321747205, # when the access token expires (it always will)
+    expires: true # this will always be true
+  },
+  extra: {
+    raw_info: {
+      account_type: 'PERSONAL',
+      id: '17841400519842852',
+      media_count: 211,
+      username: "igor_alexandrov"     
+    }
+  }
+}
+```
+
+## Long-Lived Tokens
+
+Long-Lived Tokens are valid for 60 days. To be able to use token after, you need to refresh it. Here is a sample code, that will help.
+
+
+``` ruby
+client = Omniauth::InstagramGraph::LongLivedClient.new(ENV['INSTAGRAM_APP_ID'], ENV['INSTAGRAM_APP_SECRET'])
+token = client.get_token(access_token: "<CURRENT LONG-LIVED TOKEN>")
+refreshed = token.refresh
+```
+
 ## License
 
 The gem is available as open source under the terms of the [MIT License](https://opensource.org/licenses/MIT).