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.

sinatra-authentication. Basically I am also running sinatra through CGI and that complicated stuff as well. It has to be a more pretty solution. I was thinking of using the before and after filters. — George, Jun 03 '11 at 02:05
I'm not entirely sure what you're trying to do: you should be able to write your app so it's independent of the base url, e.g. using the [`url` helper](http://www.sinatrarb.com/intro.html#Generating%20URLs). Then the path to the app is determined by how you set up your server, not the Sinatra app itself. Gems should work okay with this too. — matt, Jun 03 '11 at 02:27
Let me clarify then. I am working on a server for which I have not complete access over. I have been assigned a directory for which I can work with my project over CGI. So instead of receiving '/' for the get in sinatra I receive 'foo/blah/'. '/about' becomes '/foo/blah/about' etc. kfl62 suggested something good, which I have seen already, but any gems that redirect to '/login' would fail as they would redirect to www.host.com/login instead of www.host.com/foo/blah/login — George, Jun 03 '11 at 10:40
I edited my answer with some examples. I still believe something like: `rewrite %r{/}, '/foo/blah'` will solve your problem. — kfl62, Jun 04 '11 at 21:43
@matt should have submitted his response as an answer. I found it very helpful. — Justin Force, Nov 16 '11 at 22:53

kfl62 · Accepted Answer · 2011-06-04T21:32:53.123

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.

Thanks for this, I already came upon this but any redirects to '/login' etc see my comment above would fail. I am going to use this if I can not find anything better and rewrite the code of any gems :) — George, Jun 03 '11 at 10:45

score 2 · Answer 2 · answered Jan 28 '14 at 14:47

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.

answered Jan 28 '14 at 14:47

AlexChaffee

8,092
2
49
55

For anyone else looking for this, I just added a similar solution for Apache + CGI / FastCGI with RewriteEngine here: https://stackoverflow.com/a/52689478/823617 – Casper Oct 07 '18 at 14:36

score 1 · Answer 3 · answered Jun 02 '11 at 23:10

1

You could have a look at https://github.com/josh/rack-mount, maybe that one can help you out?

answered Jun 02 '11 at 23:10

Bert Goethals

7,867
2
20
32

Hmm thanks for this but this wouldn't work if a gem would redirect to '/' right? – George Jun 03 '11 at 01:42

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

3 Answers3