Is it possible to to rewrite the base URL in Sinatra?

Question

Is it possible to to rewrite the base URL?

E.g. instead of www.host.com/ to use www.host.com/blah/ as a base url and so:

get '/' do
  ...
end

would work for www.host.com/blah/

I could append to all my routes '/blah/..' but any gems etc. would fail to work as well.

This can be done in Rails easily and I would like to have it in Sinatra as well.

Answer 1

I use a rack middleware for this rack-rewrite and I am quite happy with it :)

    use Rack::Rewrite do
      rewrite %r{^/\w{2}/utils}, '/utils'
      rewrite %r{^/\w{2}/ctrl},  '/ctrl'
      rewrite %r{^/\w{2}/},      '/'
    end

EDIT:

Not sure if I understand your problem, but here are a config.ru file

# encoding: utf-8
require './config/trst_conf'
require 'rack-flash'
require 'rack/rewrite'

use Rack::Session::Cookie, :secret => 'zsdgryst34kkufklfSwsqwess'
use Rack::Flash
use Rack::Rewrite do
  rewrite %r{^/\w{2}/auth},  '/auth'
  rewrite %r{^/\w{2}/utils}, '/utils'
  rewrite %r{^/\w{2}/srv},   '/srv'
  rewrite %r{^/\w{2}/},      '/'
end

map '/auth' do
  run TrstAuth.new
end
map '/utils' do
  run TrstUtils.new
end
map '/srv' do
  map '/tsk' do
     run TrstSysTsk.new
  end
  map '/' do
    run TrstSys.new
  end
end
map '/' do
  run TrstPub.new
end

and an example Sinatra::Base subclass

# encoding: utf-8

class TrstAuth < Sinatra::Base

  # Render stylesheets
  get '/stylesheets/:name.css' do
    content_type 'text/css', :charset => 'utf-8'
    sass :"stylesheets/#{params[:name]}", Compass.sass_engine_options
  end

  # Render login screen
  get '/login' do
    haml :"/trst_auth/login", :layout => request.xhr? ? false : :'layouts/trst_pub'
  end

  # Authentication
  post '/login' do
    if user = TrstUser.authenticate(params[:login_name], params[:password])
      session[:user] = user.id
      session[:tasks] = user.daily_tasks
      flash[:msg] = {:msg => {:txt => I18n.t('trst_auth.login_msg'), :class => "info"}}.to_json
      redirect "#{lang_path}/srv"
    else
      flash[:msg] = {:msg => {:txt => I18n.t('trst_auth.login_err'), :class => "error"}}.to_json
      redirect "#{lang_path}/"
    end
  end

  # Logout
  get '/logout' do
    session[:user] = nil
    session[:daily_tasks] = nil
    flash[:msg] = {:msg => {:txt => I18n.t('trst_auth.logout_msg'), :class => "info"}}.to_json
    redirect "#{lang_path}/"
  end

end

maybe this helps :) full source on github.

Answer 2

In a before block you can edit env['PATH_INFO]`; Sinatra will then use the edited value for routing.

For your example, something like this might work...

before do
    env['PATH_INFO'].sub!(/^\/blah/, '')
end

I agree with the other answers that using a middleware component is a more robust solution but if you want something concise and simple, that works inside the Sinatra app instead of via config.ru, then munging the Rack environment is not bad.