Chore: Scope URLs with account_id (#601)

* Chore: Enable Users to create multiple accounts

Addresses: #402
- migrations to split roles and other attributes from users table
- make changes in code to accommodate this change

Co-authored-by: Pranav Raj Sreepuram <pranavrajs@gmail.com>

app/controllers/api/v1/accounts/callbacks_controller.rb

@@ -0,0 +1,101 @@
+class Api::V1::Accounts::CallbacksController < Api::BaseController
+  before_action :inbox, only: [:reauthorize_page]
+
+  def register_facebook_page
+    user_access_token = params[:user_access_token]
+    page_access_token = params[:page_access_token]
+    page_name = params[:page_name]
+    page_id = params[:page_id]
+    inbox_name = params[:inbox_name]
+    facebook_channel = current_account.facebook_pages.create!(
+      name: page_name, page_id: page_id, user_access_token: user_access_token,
+      page_access_token: page_access_token
+    )
+    set_avatar(facebook_channel, page_id)
+    inbox = current_account.inboxes.create!(name: inbox_name, channel: facebook_channel)
+    render json: inbox
+  end
+
+  def facebook_pages
+    @page_details = mark_already_existing_facebook_pages(fb_object.get_connections('me', 'accounts'))
+  end
+
+  # get params[:inbox_id], current_account, params[:omniauth_token]
+  def reauthorize_page
+    if @inbox&.facebook?
+      fb_page_id = @inbox.channel.page_id
+      page_details = fb_object.get_connections('me', 'accounts')
+
+      if (page_detail = (page_details || []).detect { |page| fb_page_id == page['id'] })
+        update_fb_page(fb_page_id, page_detail['access_token'])
+        return head :ok
+      end
+    end
+
+    head :unprocessable_entity
+  end
+
+  private
+
+  def inbox
+    @inbox = current_account.inboxes.find_by(id: params[:inbox_id])
+  end
+
+  def update_fb_page(fb_page_id, access_token)
+    get_fb_page(fb_page_id)&.update!(
+      user_access_token: @user_access_token, page_access_token: access_token
+    )
+  end
+
+  def get_fb_page(fb_page_id)
+    current_account.facebook_pages.find_by(page_id: fb_page_id)
+  end
+
+  def fb_object
+    @user_access_token = long_lived_token(params[:omniauth_token])
+    Koala::Facebook::API.new(@user_access_token)
+  end
+
+  def long_lived_token(omniauth_token)
+    koala = Koala::Facebook::OAuth.new(ENV['FB_APP_ID'], ENV['FB_APP_SECRET'])
+    koala.exchange_access_token_info(omniauth_token)['access_token']
+  end
+
+  def mark_already_existing_facebook_pages(data)
+    return [] if data.empty?
+
+    data.inject([]) do |result, page_detail|
+      page_detail[:exists] = current_account.facebook_pages.exists?(page_id: page_detail['id']) ? true : false
+      result << page_detail
+    end
+  end
+
+  def set_avatar(facebook_channel, page_id)
+    uri = get_avatar_url(page_id)
+
+    return unless uri
+
+    avatar_resource = LocalResource.new(uri)
+    facebook_channel.avatar.attach(io: avatar_resource.file, filename: avatar_resource.tmp_filename, content_type: avatar_resource.encoding)
+  end
+
+  def get_avatar_url(page_id)
+    begin
+      url = 'http://graph.facebook.com/' << page_id << '/picture?type=large'
+      uri = URI.parse(url)
+      tries = 3
+      begin
+        response = uri.open(redirect: false)
+      rescue OpenURI::HTTPRedirect => e
+        uri = e.uri # assigned from the "Location" response header
+        retry if (tries -= 1).positive?
+        raise
+      end
+      pic_url = response.base_uri.to_s
+    rescue StandardError => e
+      Rails.logger.debug "Rescued: #{e.inspect}"
+      pic_url = nil
+    end
+    pic_url
+  end
+end