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ruby-on-railsfacebookfacebook-graph-apideviseomniauth-facebook

omniauth-facebook error only when api version is over v2.2

I received email from facebook that my rails app is using v2.0 api and it will be deprecated. so I updated gem like this. 

-    devise (3.5.6)
+    devise (4.2.0)

-    oauth2 (1.1.0)
+    oauth2 (1.2.0)

omniauth-facebook (3.0.0)
omniauth-oauth2 (1.3.1)

I did not version up omniauth-oauth2 because of some unsolved issues.

after that, I change some deprecated view codes. and changed my config and restart server. 

config.omniauth :facebook, APP_ID, APP_SECRET, scope: 'email', info_fields: 'email,name'

It worked well but the facebook api version was still v2.0. so I googled and found this. https://github.com/mkdynamic/omniauth-facebook#api-version says that it's default version is v2.6 but I don't know why it still use v2.0. anyway, I changed config code like this. 

config.omniauth :facebook, APP_ID, APP_SECRET, scope: 'email', info_fields: 'email,name', client_options: {
site: 'https://graph.facebook.com/v2.6',
authorize_url: "https://www.facebook.com/v2.6/dialog/oauth"
}

but it did not work. log is like this. 

Started GET "/users/auth/facebook/callback?code=verylogcode&state=stateblabla" for 127.0.0.1 at 2016-07-26 22:52:03 +0900
(facebook) Callback phase initiated.
(facebook) Authentication failure! invalid_credentials: OAuth2::Error, : 
{"access_token":"very_long_token_value","token_type":"bearer","expires_in":5160039}
Processing by OmniauthCallbacksController#failure as HTML

I downgraded the config version to v2.3 but it did not work. from v2.2, it works.

My Question is this.

  1. why the omniauth-facebook does not use v2.6 at default config setting?
  2. How can I solve this problem? I googled this kind of erros but in my case, the log does not show error messages precisely. (OAuth2::Error, : actually vacant)
Solution

  • I found the answer here. https://github.com/mkdynamic/omniauth-facebook/issues/204

    I saw this post before but I overlooked it. solution is to add token_params: { parse: :json } to config like this.

    config.omniauth :facebook, APP_ID, APP_SECRET, scope: 'email', info_fields: 'email,name', client_options: {
site: 'https://graph.facebook.com/v2.6',
authorize_url: "https://www.facebook.com/v2.6/dialog/oauth"
}, token_params: { parse: :json }