TELEGRAM APP

[admin]

Here's a working example. Change token and chat_id. filedata is a string containing your CSV data.

Code:

require('ssl.https')

token = '9876543210:abcdefgh'
chat_id = '1234567890'

filedata = [[
col_a,col_b,col_c
1,2,3
4,5,6
]]

params = {
  {
    name = 'chat_id',
    value = chat_id,
  },
  {
    name = 'document',
    filename = 'report.csv',
    ctype = 'text/csv',
    value = filedata,
  }
}

boundary = os.date('%d%m%Y%H%M%S')

body = { '--' .. boundary }

for _, param in ipairs(params) do
  line = string.format('Content-Disposition: form-data; name=%q', param.name)
  if param.filename then
    line = string.format('%s; filename=%q', line, param.filename)
  end
  body[ #body + 1 ] = line

  if param.ctype then
    body[ #body + 1 ] = string.format('Content-Type: %s', param.ctype)
  end

  body[ #body + 1 ] = ''
  body[ #body + 1 ] = param.value
  body[ #body + 1 ] = '--' .. boundary
end

-- last boundary
body[ #body ] = body[ #body ] .. '--'
-- empty line at the end
body[ #body + 1 ] = ''

bodydata = table.concat(body, '\r\n')

resp = {}

log(
  ssl.https.request({
    url = 'https://api.telegram.org/bot' .. token .. '/sendDocument',
    sink = ltn12.sink.table(resp),
    method = 'POST',
    source = ltn12.source.string(bodydata),
    headers = {
      ['content-length'] = #bodydata,
      ['content-type'] = 'multipart/form-data; boundary=' .. boundary
    }
  })
)

log(table.concat(resp))