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-- -----------------------------------------------------------------------------
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-- -- SMTP client support for the Lua language.
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-- -- LuaSocket toolkit.
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-- -- Author: Diego Nehab
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-- -----------------------------------------------------------------------------
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-- -----------------------------------------------------------------------------
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-- -- Declare module and import dependencies
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-- -----------------------------------------------------------------------------
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-- local base = _G
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-- local coroutine = require("coroutine")
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-- local string = require("string")
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-- local math = require("math")
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-- local os = require("os")
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-- local socket = require("socket")
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-- local tp = require("socket.tp")
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-- local ltn12 = require("ltn12")
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-- local headers = require("socket.headers")
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-- local mime = require("mime")
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-- socket.smtp = {}
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-- local _M = socket.smtp
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-- -----------------------------------------------------------------------------
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-- -- Program constants
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-- -----------------------------------------------------------------------------
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-- -- timeout for connection
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-- _M.TIMEOUT = 60
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-- -- default server used to send e-mails
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-- _M.SERVER = "localhost"
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-- -- default port
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-- _M.PORT = 25
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-- -- domain used in HELO command and default sendmail
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-- -- If we are under a CGI, try to get from environment
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-- _M.DOMAIN = os.getenv("SERVER_NAME") or "localhost"
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-- -- default time zone (means we don't know)
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-- _M.ZONE = "-0000"
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-- ---------------------------------------------------------------------------
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-- -- Low level SMTP API
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-- -----------------------------------------------------------------------------
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-- local metat = { __index = {} }
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-- function metat.__index:greet(domain)
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-- self.try(self.tp:check("2.."))
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-- self.try(self.tp:command("EHLO", domain or _M.DOMAIN))
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-- return socket.skip(1, self.try(self.tp:check("2..")))
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-- end
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-- function metat.__index:mail(from)
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-- self.try(self.tp:command("MAIL", "FROM:" .. from))
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-- return self.try(self.tp:check("2.."))
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-- end
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-- function metat.__index:rcpt(to)
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-- self.try(self.tp:command("RCPT", "TO:" .. to))
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-- return self.try(self.tp:check("2.."))
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-- end
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-- function metat.__index:data(src, step)
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-- self.try(self.tp:command("DATA"))
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-- self.try(self.tp:check("3.."))
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-- self.try(self.tp:source(src, step))
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-- self.try(self.tp:send("\r\n.\r\n"))
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-- return self.try(self.tp:check("2.."))
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-- end
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-- function metat.__index:quit()
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-- self.try(self.tp:command("QUIT"))
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-- return self.try(self.tp:check("2.."))
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-- end
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-- function metat.__index:close()
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-- return self.tp:close()
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-- end
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-- function metat.__index:login(user, password)
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-- self.try(self.tp:command("AUTH", "LOGIN"))
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-- self.try(self.tp:check("3.."))
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-- self.try(self.tp:send(mime.b64(user) .. "\r\n"))
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-- self.try(self.tp:check("3.."))
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-- self.try(self.tp:send(mime.b64(password) .. "\r\n"))
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-- return self.try(self.tp:check("2.."))
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-- end
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-- function metat.__index:plain(user, password)
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-- local auth = "PLAIN " .. mime.b64("\0" .. user .. "\0" .. password)
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-- self.try(self.tp:command("AUTH", auth))
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-- return self.try(self.tp:check("2.."))
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-- end
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-- function metat.__index:auth(user, password, ext)
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-- if not user or not password then return 1 end
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-- if string.find(ext, "AUTH[^\n]+LOGIN") then
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-- return self:login(user, password)
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-- elseif string.find(ext, "AUTH[^\n]+PLAIN") then
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-- return self:plain(user, password)
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-- else
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-- self.try(nil, "authentication not supported")
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-- end
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-- end
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-- -- send message or throw an exception
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-- function metat.__index:send(mailt)
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-- self:mail(mailt.from)
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-- if base.type(mailt.rcpt) == "table" then
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-- for i,v in base.ipairs(mailt.rcpt) do
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-- self:rcpt(v)
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-- end
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-- else
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-- self:rcpt(mailt.rcpt)
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-- end
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-- self:data(ltn12.source.chain(mailt.source, mime.stuff()), mailt.step)
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-- end
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-- function _M.open(server, port, create)
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-- local tp = socket.try(tp.connect(server or _M.SERVER, port or _M.PORT,
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-- _M.TIMEOUT, create))
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-- local s = base.setmetatable({tp = tp}, metat)
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-- -- make sure tp is closed if we get an exception
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-- s.try = socket.newtry(function()
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-- s:close()
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-- end)
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-- return s
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-- end
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-- -- convert headers to lowercase
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-- local function lower_headers(headers)
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-- local lower = {}
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-- for i,v in base.pairs(headers or lower) do
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-- lower[string.lower(i)] = v
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-- end
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-- return lower
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-- end
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-- ---------------------------------------------------------------------------
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-- -- Multipart message source
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-- -----------------------------------------------------------------------------
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-- -- returns a hopefully unique mime boundary
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-- local seqno = 0
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-- local function newboundary()
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-- seqno = seqno + 1
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-- return string.format('%s%05d==%05u', os.date('%d%m%Y%H%M%S'),
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-- math.random(0, 99999), seqno)
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-- end
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-- -- send_message forward declaration
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-- local send_message
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-- -- yield the headers all at once, it's faster
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-- local function send_headers(tosend)
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-- local canonic = headers.canonic
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-- local h = "\r\n"
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-- for f,v in base.pairs(tosend) do
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-- h = (canonic[f] or f) .. ': ' .. v .. "\r\n" .. h
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-- end
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-- coroutine.yield(h)
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-- end
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-- -- yield multipart message body from a multipart message table
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-- local function send_multipart(mesgt)
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-- -- make sure we have our boundary and send headers
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-- local bd = newboundary()
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-- local headers = lower_headers(mesgt.headers or {})
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-- headers['content-type'] = headers['content-type'] or 'multipart/mixed'
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-- headers['content-type'] = headers['content-type'] ..
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-- '; boundary="' .. bd .. '"'
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-- send_headers(headers)
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-- -- send preamble
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-- if mesgt.body.preamble then
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-- coroutine.yield(mesgt.body.preamble)
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-- coroutine.yield("\r\n")
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-- end
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-- -- send each part separated by a boundary
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-- for i, m in base.ipairs(mesgt.body) do
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-- coroutine.yield("\r\n--" .. bd .. "\r\n")
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-- send_message(m)
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-- end
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-- -- send last boundary
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-- coroutine.yield("\r\n--" .. bd .. "--\r\n\r\n")
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-- -- send epilogue
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-- if mesgt.body.epilogue then
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-- coroutine.yield(mesgt.body.epilogue)
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-- coroutine.yield("\r\n")
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-- end
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-- end
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-- -- yield message body from a source
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-- local function send_source(mesgt)
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-- -- make sure we have a content-type
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-- local headers = lower_headers(mesgt.headers or {})
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-- headers['content-type'] = headers['content-type'] or
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-- 'text/plain; charset="iso-8859-1"'
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-- send_headers(headers)
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-- -- send body from source
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-- while true do
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-- local chunk, err = mesgt.body()
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-- if err then coroutine.yield(nil, err)
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-- elseif chunk then coroutine.yield(chunk)
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-- else break end
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-- end
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-- end
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-- -- yield message body from a string
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-- local function send_string(mesgt)
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-- -- make sure we have a content-type
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-- local headers = lower_headers(mesgt.headers or {})
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-- headers['content-type'] = headers['content-type'] or
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-- 'text/plain; charset="iso-8859-1"'
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-- send_headers(headers)
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-- -- send body from string
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-- coroutine.yield(mesgt.body)
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-- end
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-- -- message source
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-- function send_message(mesgt)
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-- if base.type(mesgt.body) == "table" then send_multipart(mesgt)
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-- elseif base.type(mesgt.body) == "function" then send_source(mesgt)
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-- else send_string(mesgt) end
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-- end
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-- -- set defaul headers
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-- local function adjust_headers(mesgt)
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-- local lower = lower_headers(mesgt.headers)
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-- lower["date"] = lower["date"] or
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-- os.date("!%a, %d %b %Y %H:%M:%S ") .. (mesgt.zone or _M.ZONE)
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-- lower["x-mailer"] = lower["x-mailer"] or socket._VERSION
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-- -- this can't be overriden
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-- lower["mime-version"] = "1.0"
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-- return lower
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-- end
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-- function _M.message(mesgt)
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-- mesgt.headers = adjust_headers(mesgt)
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-- -- create and return message source
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-- local co = coroutine.create(function() send_message(mesgt) end)
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-- return function()
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-- local ret, a, b = coroutine.resume(co)
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-- if ret then return a, b
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-- else return nil, a end
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-- end
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-- end
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-- ---------------------------------------------------------------------------
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-- -- High level SMTP API
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-- -----------------------------------------------------------------------------
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-- _M.send = socket.protect(function(mailt)
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-- local s = _M.open(mailt.server, mailt.port, mailt.create)
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-- local ext = s:greet(mailt.domain)
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-- s:auth(mailt.user, mailt.password, ext)
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-- s:send(mailt)
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-- s:quit()
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-- return s:close()
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-- end)
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-- return _M
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