parse_json_from_request.lua

local cjson = require("cjson")
-- ngx.var.request:split(" ")[2]
-- local m = ngx.re.match(path,[=[/([^/]+)\.(json|xml)$]=])
-- local res = ngx.location.capture(/home/ivan/json/m[1] .. ".json" )
-- local value=cjson.new().decode(res.body)

work_dir = '/home/ivan/nginx_configs/lua_configs/'

function get_data(filename)
        f = io.open(filename, "rb")
        if f == nill then 
            ngx.header["Erorr"] = "JSON FILE NOT FOUND"
            return false
        else
            local content = f:read("*all")
            f:close()
            local cjson = require("cjson")
            local value = cjson.decode(content)
            for key,val in pairs(value) do
                success, err, forcible = ngx.shared.data:set(key, val)
                data[key] = val
                if not success then
                    ngx.header["Erorr"] = "JSON FILE "..filename.."Cannot decode"
                    return false
                end
            end
        end
      return true
end


local h = ngx.req.get_headers()
local filename = h['filename']
if get_data(work_dir..filename) then 
    ngx.exit(200)
else
     return ngx.exit(404)
end