lua lapis upload file service

app.lua

local lapis = require("lapis")
local http = require("socket.http")
local app = lapis.Application()

is_file = function(input)
  return type(input) == "table" and input.filename ~= "" and input.content ~= "", "Missing file"
end

app:match("/", function()
  return "Image Service"
end)

app:match("/version", function()
  return "Welcome to Lapis " .. require("lapis.version")
end)

app:post("/ns", function(self)
  local style_image = self.params.style_image
  
  -- Create temporary file (/tmp/****)
  local filePath = os.tmpname()
  local xFile = io.open(filePath, "w")
  
  if is_file(style_image) == false then
    -- Image provided as url
    -- curl --data-urlencode "style_image=http://www.vetprofessionals.com/catprofessional/images/home-cat.jpg" 192.168.47.17:8080/ns
    local save = ltn12.sink.file(xFile)
    http.request{url = style_image, sink = save }
  else
    -- Image provided as image object
    -- curl --form style_image=@katt.jpg --form press=OK 192.168.47.17:8080/ns
    xFile:write(style_image.content)
    xFile:close()
  end
  return filePath
end)

return app

Hey, I guess we are not supposed to write image content files in the above mentioned way. For those who are facing issues,
Try,

  local xFile = io.open(filePath, "w")
  io.output(xFile)
  io.write(style_image.content)
  io.close(xFile)

Cheers !! XD

Thanks, good to know :)