Send LogicMachine backup file to Dropbox #

Create a Dropbox app #

1. Go to https://www.dropbox.com/developers/apps and click Create app.

2. Fill in the form as click Create app:

• Choose an API = Scoped access
• Choose the type of access you need = App folder
• Choose a unique name for your app, a folder with the same name will be created in your Dropbox account inside of the Apps folder.

3. Switch to Permissions tab, enable files.content.write permission and click Submit at the bottom of the window.

4. Switch to Settings, find App key and App secret values. These values will be needed later.

Get refresh token #

1. Copy the following URL, replace APPKEYHERE with your App key and open it in your browser.

https://www.dropbox.com/oauth2/authorize?client_id=APPKEYHERE&response_type=code&token_access_type=offline

2. Connect your account to your application and copy the resulting Authorization code.

3. Run the following script once, replace ... with the respective App key, App secret and Authorization code values.

appkey = '...'
appsecret = '...'
authcode = '...'

json = require('json')
ltn12 = require('ltn12')
http = require('socket.http')
escape = require('socket.url').escape

data = table.concat({
  'code=' .. escape(authcode),
  'grant_type=authorization_code'
}, '&')

res, code, hdrs, status = http.request({
  url = 'https://api.dropbox.com/oauth2/token',
  method = 'POST',
  user = appkey,
  password = appsecret,
  headers = {
    ['Content-Length'] = #data,
  },
  source = ltn12.source.string(data),
})

if code == 200 then
  resp = json.pdecode(res)
  log('refresh token', resp.refresh_token)
else
  log('request failed', res, code)
end

4. Refresh token will visible in LM Logs tab.

If you receive code has expired error, run steps 2 and 3 again

Scheduled script #

Create a scheduled script that runs the backup procedure, replace ... with the respective App key, App secret and Refresh token values. Run the script and check the results in the LM Logs tab.

filepath can contain folders (separated by /). This can be useful if you want to use a single app for backups from multiple LMs.

appkey = '...'
appsecret = '...'
refreshtoken = '...'

filepath = '/LM-' .. os.date('%Y-%m-%d') .. '.zip'

json = require('json')
ltn12 = require('ltn12')
http = require('socket.http')
escape = require('socket.url').escape

data = table.concat({
  'refresh_token=' .. escape(refreshtoken),
  'grant_type=refresh_token',
  'client_id=' .. escape(appkey),
  'client_secret=' .. escape(appsecret)
}, '&')

res, code, hdrs, status = http.request({
  url = 'https://api.dropbox.com/oauth2/token',
  method = 'POST',
  headers = {
    ['Content-Length'] = #data,
  },
  source = ltn12.source.string(data),
})

if code ~= 200 then
  log('access token request failed', res, code)
  return
end

token = json.pdecode(res).access_token

webrequest = require('webrequest')
filedata, err = webrequest('general', 'backup')

res, code, hdrs, status = http.request({
  url = 'https://content.dropboxapi.com/2/files/upload',
  method = 'POST',
  headers = {
    ['Authorization'] = 'Bearer ' .. token,
    ['Content-Type'] = 'application/octet-stream',
    ['Content-Length'] = #filedata,
    ['Dropbox-API-Arg'] = json.encode({
      path = filepath,
      mode = 'add',
      autorename = true,
      mute = false
    }),
  },
  source = ltn12.source.string(filedata),
})

if code == 200 then
  log('dropbox backup ok')
else
  log('dropbox backup failed', res, code, hdrs, status)
end