feat(auth): Provide reauth param to handle changed server endpoints

Summary:
Notify the backend when auth is a reauth of an existing account by
providing the `accountId`. This lets the backend differentiate between
a new auth (where a new account will be created if the server endpoints
don't match) and a re-auth (where the auth will fail on server endpoint
mismatch, prompting the user).

Test Plan: manual

Reviewers: juan, evan, bengotow

Reviewed By: bengotow

Subscribers: mg, spang, kav-ya

Differential Revision: https://phab.nylas.com/D2833

internal_packages/onboarding/lib/account-settings-page.cjsx

@@ -3,7 +3,7 @@ ReactDOM = require 'react-dom'
 _ = require 'underscore'
 {ipcRenderer, dialog, remote} = require 'electron'
 {RetinaImg} = require 'nylas-component-kit'
-{RegExpUtils, EdgehillAPI, NylasAPI, APIError, Actions} = require 'nylas-exports'
+{RegExpUtils, EdgehillAPI, NylasAPI, APIError, Actions, AccountStore} = require 'nylas-exports'
 
 OnboardingActions = require './onboarding-actions'
 NylasApiEnvironmentStore = require './nylas-api-environment-store'
@@ -318,6 +318,10 @@ class AccountSettingsPage extends React.Component
       data.settings[k] = v
     data.provider = @state.provider.name
 
+    # if there's an account with this email, get the ID for it to notify the backend of re-auth
+    account = AccountStore.accountForEmail(email)
+    reauthParam = if account then "&reauth=#{account.id}" else ""
+
     # handle special case for exchange/outlook/hotmail username field
     if data.provider in ['exchange','outlook','hotmail'] and not data.settings.username?.trim().length
       data.settings.username = data.email
@@ -328,7 +332,7 @@ class AccountSettingsPage extends React.Component
     # If this succeeds, send the received code to N1 server to register the account
     # Otherwise process the error message from the server and highlight UI as needed
     NylasAPI.makeRequest
-      path: "/auth?client_id=#{NylasAPI.AppID}&n1_id=#{NylasEnv.config.get('updateIdentity')}"
+      path: "/auth?client_id=#{NylasAPI.AppID}&n1_id=#{NylasEnv.config.get('updateIdentity')}#{reauthParam}"
       method: 'POST'
       body: data
       returnsModel: false
@@ -389,6 +393,15 @@ class AccountSettingsPage extends React.Component
     pageNumber = @state.pageNumber
     errorFieldNames = err.body?.missing_fields || err.body?.missing_settings
 
+    if err.errorTitle is "setting_update_error"
+      choice = dialog.showMessageBox(remote.getCurrentWindow(), {
+        type: 'info',
+        buttons: ['Okay'],
+        title: 'Confirm',
+        message: 'The IMAP/SMTP servers for this account do not match our records. Please verify that any server names you entered are correct. If your IMAP/SMTP server has changed, first remove this account from N1, then try logging in again.'
+      })
+      OnboardingActions.moveToPage("account-settings")
+
     if errorFieldNames
       {pageNumber, errorMessage} = @_stateForMissingFieldNames(errorFieldNames)
     if err.statusCode is -123 # timeout

src/flux/errors.coffee

@@ -13,6 +13,7 @@ class APIError extends Error
     @requestOptions ?= @response?.requestOptions
     @name = "APIError"
     @message = @body?.message ? @body ? @error?.toString?()
+    @errorTitle = @error?.toString?()
 
 class TimeoutError extends Error
   constructor: ->