Facebook Graph API w/ Koala

facebook_graph_api.rb

### app access token
graph = Koala::Facebook::OAuth.new APP_ID, APP_SECRET
graph.get_app_access_token # => APP_TOKEN

### create test users with permissions
test_users = Koala::Facebook::TestUsers.new app_id: APP_ID, secret: APP_SECRET
user = test_users.create true, 'email,user_birthday,user_posts', name: 'Bob'
# =>
#  { "id" => USER_ID,
#    "access_token" => USER_ACCESS_TOKEN,
#    "login_url" => USER_LOGIN_URL,
#    "email" => USER_EMAIL,
#    "password" => USER_PASSWORD }

test_users.create_network 5, true, 'email,user_birthday,user_posts,user_photos' # => they will all be friends`
test_users.delete_all # you can also destroy everyone

### debug token
graph = Koala::Facebook::API.new APP_TOKEN, APP_SECRET
graph.debug_token token
# =>
#  { "data" =>
#     { "app_id" => APP_ID,
#       "application" => APP_NAME,
#       "expires_at" => 1426514400,
#       "is_valid" => true,
#       "scopes" => ["public_profile", "basic_info", "email", "user_birthday", "user_friends", "user_posts"],
#       "user_id" => USER_ID
#     }
#  }

### generate a long-lived token
oauth = Koala::Facebook::OAuth.new APP_ID, APP_SECRET
oauth.exchange_access_token short_lived_token # => LONG_LIVED_TOKEN

### get posts with image (normal size not just the 130x130 thumbnail)
graph = Koala::Facebook::API.new USER_ACCESS_TOKEN, APP_SECRET
graph.get_connections 'me', 'posts', fields: 'message,story,type,attachments'

# profile picture: "https://graph.facebook.com/#{user_facebook_uid}/picture?width=1500&height=1500"

### permissions

graph.get_connection 'me', 'permissions'
# =>
# [{"permission"=>"public_profile", "status"=>"granted"},
#  {"permission"=>"email", "status"=>"granted"},
#  {"permission"=>"user_birthday", "status"=>"granted"},
#  {"permission"=>"user_photos", "status"=>"granted"}]

# =>
# [{"permission"=>"public_profile", "status"=>"granted"},
#  {"permission"=>"email", "status"=>"granted"},
#  {"permission"=>"user_photos", "status"=>"granted"},
#  {"permission"=>"user_birthday", "status"=>"declined"},
#  {"permission"=>"user_posts", "status"=>"declined"}]


### albums with cover photos
offset = 0
limit = 200

_cover_ids, cover_photos = graph.batch do |batch_api|
  batch_api.get_connection 'me', 'albums', { offset: offset, limit: limit, fields: 'cover_photo' }, batch_args: { name: 'cover-ids', omit_response_on_success: false }
  batch_api.get_objects "{result=cover-ids:$.data.*.cover_photo}", fields: 'album{name,count},source'
end

albums = cover_photos.each_with_object([]) do |(_c_id, data), ret|
  ret << { id: data['id'],
           name: data['album']['name'],
           picture_count: data['album']['count'],
           cover_url: data['source'] }
end


### getting picture_urls from album
pic_limit = 100
pic_offset = 0

album_photos = graph.get_object album_id, fields: "photos.limit(#{pic_limit}).offset(#{pic_offset}){source}"
photo_urls = album_photos['photos']['data'].map { |p| p['source'] }

# page RTU
# https://developers.facebook.com/docs/graph-api/reference/page/subscribed_apps