API version checking using Sinatra's before filter

gistfile1.rb

require 'sinatra'

# Set the version of the API being run here
#
MAJOR_VERSION = 1
MINOR_VERSION = 0

helpers do
  def version_compatible?(nums)
    return MAJOR_VERSION == nums[0].to_i && MINOR_VERSION >= nums[1].to_i
  end
end

# Enforce compatibility before the call. Rewrite the
# URL in the request to remove the API versioning stuff
#
before %r{/api/v(\d)\.(\d)} do
  if version_compatible?(params[:captures])
    target = request.fullpath.split('/').last
    request.path_info = "/#{target}"
  else
    halt 400, "Version not compatible with this server"
  end
end

# Reach this route using
#   http://localhost:4567/api/vX.Y/hello
#
get '/hello' do
  "Hello there, compatible client."
end

Thanks for this. I had problems further down the resource chain i.e. http://localhost:4567/api/people/ would work using this code, but http://localhost:4567/api/people/1/phones/23/ would not. I put a small fix together @ https://gist.github.com/987094 that allows for nested resources.

Thanks! That was a bit of a miss in my gist for sure - I incorporated the snippet into an application and replaced the code for munging the URL to use regex and post_match() - this gives you the piece of the string that _hasn't_ been matched by the regex, which is ideal. Appreciate the update - I've added another fork to the gist with the post_match() approach and updated the blog entry....

…

--oh ## Oisin Hurley oisin.hurley@gmail.com

On Monday 23 May 2011 at 18:52, leereilly wrote: Thanks for this. I had problems further down the resource chain i.e. `http://localhost:4567/api/people/` would work using this code, but `http://localhost:4567/api/people/1/phones/23/` would not. I put a small fix together @ https://gist.github.com/987094 that allows for nested resources. ## Reply to this email directly or view it on GitHub: https://gist.github.com/952572