--***********************************************************--
--** Email image attachment created by Erwin van der Zwart **--
--***********************************************************--
--******************* Start of parameters *******************--
--***********************************************************--

--Gmail (smtp) username !IMPORTANT!
user = 'YourGmailAddress@gmail.com'

--Gmail (smtp) password !IMPORTANT!
password = 'YourPassword'

--Sender for e-mail
from = '<erwin.van.der.zwart@gmail.com>'
alias_from = 'Erwin van der Zwart'

--Recipient for e-mail
to = '<erwin.van-der-zwart@schneider-electric.com>'
alias_to = 'Erwin van der Zwart'

--Subject for e-mail
subject = 'Schneider Electric logo from website automaticly send by homeLYnk'

--Attachment and filetype (set filetype as 'gif', 'png', 'bmp', 'jpg' or 'jpeg' according image source)
image_type = 'gif'
image_name_attachment = 'logo'
source_image_url = 'http://www.schneider-electric.com/navigation/images/se_logo.gif'
image_description = 'Logo from Schneider Electric'

--Message on bottom of email (will only be showed when client don't understand attachment)
epilogue = 'End of message'

--***********************************************************--
--******************** End of parameters ********************--
--***********************************************************--
--********** DON'T CHANGE ANYTHING UNDER THIS LINE **********--
--***********************************************************--

--Get remote (from HTTP) image and put image file to HL (will be deleted when end of script)
os.execute('wget -O /www/scada/vis/' .. image_name_attachment .. '.' .. image_type .. ' ' .. source_image_url .. '')

--Create filename and location
local fileName = '/www/scada/vis/' .. image_name_attachment .. '.' .. image_type

--Create table to include mail settings
local settings = {
    from = from,
    rcpt = to,
    user = user,
    password = password,
    server = 'smtp.gmail.com',
    port = 465,
    secure = 'sslv23',
}

--Load required modules to send email with attachment
local smtp = require("socket.smtp")
local mime = require("mime")
local ltn12 = require("ltn12")

--Create e-mail header
settings.source = smtp.message{
headers = {
          from = '' .. alias_from .. ' ' .. from .. '',
          to = '' .. alias_to .. ' ' .. to .. '',
          subject = subject
},

--Load attachment inside body     
body = {
preamble = "",
 [1] = {  
      headers = {
        ["content-type"] = 'image/' .. image_type .. '; name="' .. image_name_attachment .. '.' .. image_type .. '"',
        ["content-disposition"] = 'attachment; filename="' .. image_name_attachment .. '.' .. image_type .. '"',
        ["content-description"] = '' .. image_description .. '',
        ["content-transfer-encoding"] = "BASE64"
      },
               
      body = ltn12.source.chain(
      ltn12.source.file(io.open(fileName, "rb")),
      ltn12.filter.chain(
      mime.encode("base64"),
      mime.wrap()
        )
      )
    },
      epilogue = epilogue
  }
}

--Send the email
r, e = smtp.send(settings)

--Create alert when sending gives an error with error message
if (e) then
     alert("Could not send email: ", e, "\n")
end

--Delete downloaded image file from HL
os.remove(fileName)