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require 'action_dispatch/http/request'
module ActionDispatch
# ActionDispatch::ParamsParser works for all the requests having any Content-Length
# (like POST). It takes raw data from the request and puts it through the parser
# that is picked based on Content-Type header.
#
# In case of any error while parsing data ParamsParser::ParseError is raised.
class ParamsParser
# Raised when raw data from the request cannot be parsed by the parser
# defined for request's content mime type.
class ParseError < StandardError
attr_reader :original_exception
def initialize(message, original_exception)
super(message)
@original_exception = original_exception
end
end
DEFAULT_PARSERS = {
Mime::JSON => lambda { |raw_post|
data = ActiveSupport::JSON.decode(raw_post)
data = {:_json => data} unless data.is_a?(Hash)
Request::Utils.normalize_encode_params(data)
}
}
# Create a new +ParamsParser+ middleware instance.
#
# The +parsers+ argument can take Hash of parsers where key is identifying
# content mime type, and value is a lambda that is going to process data.
def initialize(app, parsers = {})
@app, @parsers = app, DEFAULT_PARSERS.merge(parsers)
end
def call(env)
request = Request.new(env)
parse_formatted_parameters(request, @parsers) do |params|
request.request_parameters = params
end
@app.call(env)
end
private
def parse_formatted_parameters(request, parsers)
return if request.content_length.zero?
strategy = parsers.fetch(request.content_mime_type) { return nil }
yield strategy.call(request.raw_post)
rescue => e # JSON or Ruby code block errors
logger(request).debug "Error occurred while parsing request parameters.\nContents:\n\n#{request.raw_post}"
raise ParseError.new(e.message, e)
end
def logger(request)
request.logger || ActiveSupport::Logger.new($stderr)
end
end
end
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