upload-file-upload-with-lua.md

Upload file with Lua and Nginx

server {
  location / {
    content_by_lua_block {
      local upload = require "upload"

      local form, err = upload:new(4096)
      if not form then
        ngx.say(err)
        ngx.exit(200)
      end
      
      form:set_timeout(1000)
      file = io.open('/tmp/upload.tmp', "w+")
      
      while true do
        local typ, res, err = form:read()
        if not typ then
          ngx.say(err)
          return
        end
      
        if typ == "body" then
          file:write(res)
        end
      
        if typ == "eof" then
          break
        end
      end
      
      ngx.say("file uploaded")
    }
  }
}

• content_by_lua_block - lib:nginx-lua module directive to specify block of Lua code
• require "upload" - load lib:lua-upload module to handle uploads, see how to include modules
• upload:new - init upload form object to get uploaded data
• if not form then - handle upload errors
• /tmp/upload.tmp - we'll save uploaded data to this file on server
• form:read() - read next chunk of uploaded data
• file:write(res) - write chunk to the file on server
• ngx.say("file uploaded") - say something when upload is finished