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Facebook OAuth2 Strategy for OmniAuth.
Supports OAuth 2.0 server-side and client-side flows. Read the Facebook docs for more details: http://developers.facebook.com/docs/authentication
Add to your Gemfile
:
gem 'omniauth-facebook'
Then bundle install
.
OmniAuth::Strategies::Facebook
is simply a Rack middleware. Read the OmniAuth docs for detailed instructions: https://github.com/intridea/omniauth.
Here's a quick example, adding the middleware to a Rails app in config/initializers/omniauth.rb
:
Rails.application.config.middleware.use OmniAuth::Builder do
provider :facebook, ENV['FACEBOOK_APP_ID'], ENV['FACEBOOK_APP_SECRET']
end
See the example Sinatra app for full examples of both the server and client-side flows (including using the Facebook Javascript SDK).
You can configure several options, which you pass in to the provider
method via a Hash
:
Option name | Default | Explanation |
---|---|---|
scope |
email |
A comma-separated list of permissions you want to request from the user. See the Facebook docs for a full list of available permissions: https://developers.facebook.com/docs/reference/login/ |
display |
page |
The display context to show the authentication page. Options are: page , popup and touch . Read the Facebook docs for more details: https://developers.facebook.com/docs/reference/dialogs/oauth/ |
image_size |
square |
Set the size for the returned image url in the auth hash. Valid options include square (50x50), small (50 pixels wide, variable height), normal (100 pixels wide, variable height), or large (about 200 pixels wide, variable height). Additionally, you can request a picture of a specific size by setting this option to a hash with :width and :height as keys. This will return an available profile picture closest to the requested size and requested aspect ratio. If only :width or :height is specified, we will return a picture whose width or height is closest to the requested size, respectively. |
info_fields |
name,email |
Specify exactly which fields should be returned when getting the user's info. Value should be a comma-separated string as per https://developers.facebook.com/docs/graph-api/reference/user/ (only /me endpoint). |
locale |
Specify locale which should be used when getting the user's info. Value should be locale string as per https://developers.facebook.com/docs/reference/api/locale/. | |
auth_type |
Optionally specifies the requested authentication features as a comma-separated list, as per https://developers.facebook.com/docs/facebook-login/reauthentication/. Valid values are https (checks for the presence of the secure cookie and asks for re-authentication if it is not present), and reauthenticate (asks the user to re-authenticate unconditionally). Use 'rerequest' when you want to request premissions. Default is nil . |
|
secure_image_url |
false |
Set to true to use https for the avatar image url returned in the auth hash. |
callback_url / callback_path |
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 'Advanced' settings section in the configuration for your Facebook app for more details). |
For example, to request email
, user_birthday
and read_stream
permissions and display the authentication page in a popup window:
Rails.application.config.middleware.use OmniAuth::Builder do
provider :facebook, ENV['FACEBOOK_APP_ID'], ENV['FACEBOOK_APP_SECRET'],
scope: 'email,user_birthday,read_stream', display: 'popup'
end
OmniAuth Facebook uses versioned API endpoints by default (current v4.0). You can configure a different version via client_options
hash passed to provider
, specifically you should change the version in the site
and authorize_url
parameters. For example, to change to v7.0 (assuming that exists):
use OmniAuth::Builder do
provider :facebook, ENV['FACEBOOK_APP_ID'], ENV['FACEBOOK_APP_SECRET'],
client_options: {
site: 'https://graph.facebook.com/v7.0',
authorize_url: "https://www.facebook.com/v7.0/dialog/oauth"
}
end
If you want to set the display
format, auth_type
, or scope
on a per-request basis, you can just pass it to the OmniAuth request phase URL, for example: /auth/facebook?display=popup
or /auth/facebook?scope=email
.
Here's an example Auth Hash available in request.env['omniauth.auth']
:
{
provider: 'facebook',
uid: '1234567',
info: {
email: '[email protected]',
name: 'Joe Bloggs',
first_name: 'Joe',
last_name: 'Bloggs',
image: 'http://graph.facebook.com/1234567/picture?type=square&access_token=...',
verified: true
},
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: {
id: '1234567',
name: 'Joe Bloggs',
first_name: 'Joe',
last_name: 'Bloggs',
link: 'http://www.facebook.com/jbloggs',
username: 'jbloggs',
location: { id: '123456789', name: 'Palo Alto, California' },
gender: 'male',
email: '[email protected]',
timezone: -8,
locale: 'en_US',
verified: true,
updated_time: '2011-11-11T06:21:03+0000',
# ...
}
}
}
The precise information available may depend on the permissions which you request.
You can use the Facebook Javascript SDK with FB.login
, and just hit the callback endpoint (/auth/facebook/callback
by default) once the user has authenticated in the success callback.
Note that you must enable cookies in the FB.init
config for this process to work.
See the example Sinatra app under example/
and read the Facebook docs on Login for JavaScript for more details.
The client-side flow is supported by parsing the authorization code from the signed request which Facebook places in a cookie.
When you call /auth/facebook/callback
in the success callback of FB.login
that will pass the cookie back to the server. omniauth-facebook will see this cookie and:
- parse it,
- extract the authorization code contained in it
- and hit Facebook and obtain an access token which will get placed in the
request.env['omniauth.auth']['credentials']
hash.
The expiration time of the access token you obtain will depend on which flow you are using.
If you use the client-side flow, Facebook will give you back a short lived access token (~ 2 hours).
You can exchange this short lived access token for a longer lived version. Read the Facebook docs for more information on exchanging a short lived token for a long lived token.
If you use the server-side flow, Facebook will give you back a longer lived access token (~ 60 days).
- Ruby MRI (2.5, 2.6, 2.7, 3.0)
Copyright (c) 2012 by Mark Dodwell
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