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Simple HTTP app Proxy using sinatra
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# ENDPOINT="host.com" ruby app_proxy.rb | |
# curl -i localhost:4567/capture # => "<TIMEOUT>" or regular response every 2 calls | |
require 'sinatra' | |
require 'net/http' | |
$request_settings = { host: ENV["ENDPOINT"] } | |
$headers = { "Content-Type" => "application/json" } | |
$counter = 0 | |
# define halts | |
$might_timeout = -> (request) { request.path_info =~ /preauthorization/ } | |
# methods | |
def api_request(type, path, query_string, body, new_headers) | |
uri = URI::HTTP.build( | |
$request_settings.merge( | |
path: path, | |
query: query_string, | |
) | |
) | |
req = Net::HTTP.const_get(type).new(uri, $headers.merge(new_headers)) | |
req.body = body.read | |
Net::HTTP.new(uri.hostname, uri.port).start {|http| http.request(req) } | |
end | |
def all_headers(response) | |
header_list = {} | |
response.header.each_capitalized do |k,v| | |
header_list[k] =v unless k == "Transfer-Encoding" | |
end | |
header_list | |
end | |
def incomming_headers(request) | |
request.env.map { |header, value| [header[5..-1].split("_").map(&:capitalize).join('-'), value] if header.start_with?("HTTP_") }.compact.to_h | |
end | |
# wildcard routing | |
%w(get post put patch delete).each do |verb| | |
send(verb, /.*/) do | |
content_type $headers["Content-Type"] | |
start_request = Thread.new { | |
api_request(verb.capitalize, request.path_info, request.query_string, request.body, incomming_headers(request)) | |
} | |
if $might_timeout.call(request) | |
$counter += 1 | |
halt(404, "<TIMEOUT>") if ($counter % 2).zero? | |
end | |
response = start_request.value | |
status response.code | |
headers all_headers(response) | |
response.body | |
end | |
end |
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