Load session using session id - session

Question

I have a Sinatra application, in which one of the rules expect the URL to contain the session id (returned from a previously called URL). How to overload the session with the one referenced by the session ID?
use Rack::Session::Pool
get "example/:session_id" do
sessionId = params[:session_id]
# how to reload the session now, using the sessionId?
end
Thanks for the help!

Answer 1

Session ID in Path
If you must use a session id from the path, you can use this hacky way
# app.rb
require 'sinatra'
configure do
use Rack::Session::Pool, :key => 'session_id'
end
get "/example/:session_id" do
session.id = params[:session_id]
session[:force_load] = 'force' # force session.load!()
session.delete(:force_load) # remove dummy value
session[:count] = session[:count].to_i + 1
session.inspect
end
Session ID in Request Params
A supported way would be to set :cookie_only option to false if you are willing to move session_id to a request parameter (query parameter or body parameter)
# app.rb
require 'sinatra'
configure do
use Rack::Session::Pool, {
:key => 'session_id',
:cookie_only => false, # adds request params as source for session id
}
end
# works with /example?session_id=
get '/example' do
session[:count] = session[:count].to_i + 1
session.inspect
end
Demo
$ ruby app.rb &> /dev/null &
$ curl -i localhost:4567/example?session_id=
HTTP/1.1 200 OK
Set-Cookie: session_id=2a06759c64c130bc45036076; path=/; HttpOnly
{"count"=>1}
$ curl -i localhost:4567/example?session_id=2a06759c64c130bc45036076
HTTP/1.1 200 OK
Set-Cookie: session_id=2a06759c64c130bc45036076; path=/; HttpOnly
{"count"=>2}
$ kill %1