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#!/usr/bin/env lua5.1
local marigold = require 'marigold-cgi.marigold'
local h = marigold.h
local b64 = require '3rdparty.base64'
local json = require '3rdparty.json'
local draw = require 'draw'
local function error(message)
print('Content-type: text/plain\n')
print(string.format('ERROR: %s', message))
os.exit(1)
end
-- get statistics
local metavars = marigold.get_metavars()
local query = marigold.decode_query(metavars.query_string or '')
if not query.statistics then
error('no statistics submitted!')
end
local statistics = json.decode(b64.decode(query.statistics))
-- create & respond with image
local svg = draw.draw(statistics)
print('Content-type: image/svg+xml\n')
print(svg)
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