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Contents
module Rack
# A Rack middleware for providing JSON-P support.
#
# Full credit to Flinn Mueller (http://actsasflinn.com/) for this contribution.
#
class JSONP
def initialize(app)
@app = app
end
# Proxies the request to the application, stripping out the JSON-P callback
# method and padding the response with the appropriate callback format.
#
# Changes nothing if no <tt>callback</tt> param is specified.
#
def call(env)
status, headers, response = @app.call(env)
request = Rack::Request.new(env)
if request.params.include?('callback')
response = pad(request.params.delete('callback'), response)
headers['Content-Length'] = response.length.to_s
end
[status, headers, response]
end
# Pads the response with the appropriate callback format according to the
# JSON-P spec/requirements.
#
# The Rack response spec indicates that it should be enumerable. The method
# of combining all of the data into a single string makes sense since JSON
# is returned as a full string.
#
def pad(callback, response, body = "")
response.each{ |s| body << s.to_s }
"#{callback}(#{body})"
end
end
end
Version data entries
12 entries across 12 versions & 5 rubygems