(VB.NET UWP/WinRT) ETrade OAuth1 Authorization (3-legged) Step 2

Demonstrates the final step in 3-legged OAuth1 authorization for the ETrade REST API. Example uses the OAuth1 verifier code that was copy-and-pasted from the browser in the 1st step. The end result of this final OAuth1 step is an access token that can be used to make ETrade REST API calls.

See https://apisb.etrade.com/docs/api/authorization/get_access_token.html

Chilkat Universal Windows Platform (UWP) / WinRT Downloads Chilkat for the Universal Windows Platform (UWP)

' This requires the Chilkat API to have been previously unlocked.
' See Global Unlock Sample for sample code.

Dim consumerKey As String = "ETRADE_CONSUMER_KEY"
Dim consumerSecret As String = "ETRADE_CONSUMER_SECRET"

Dim requestTokenUrl As String = "https://apisb.etrade.com/oauth/request_token"
Dim authorizeUrl As String = "https://us.etrade.com/e/t/etws/authorize"
Dim accessTokenUrl As String = "https://apisb.etrade.com/oauth/access_token"

Dim http As New Chilkat.Http
Dim success As Boolean = True

http.OAuth1 = True
http.OAuthConsumerKey = consumerKey
http.OAuthConsumerSecret = consumerSecret
http.OAuthCallback = "oob"

Dim jsonRequestToken As New Chilkat.JsonObject
success = jsonRequestToken.LoadFile("qa_data/tokens/etrade_request_token.json")
Dim requestToken As String = jsonRequestToken.StringOf("oauth_token")
Dim requestTokenSecret As String = jsonRequestToken.StringOf("oauth_token_secret")

' ------------------------------------------------------------------------------
' Exchange the OAuth Request Token for an OAuth Access Token.

http.OAuthToken = requestToken
http.OAuthTokenSecret = requestTokenSecret

' This is the verifier that was interactively copy-and-pasted from the browser back to our app.
http.OAuthVerifier = "NJ07S"

Dim resp As Chilkat.HttpResponse = Await http.QuickGetObjAsync(accessTokenUrl)
If (http.LastMethodSuccess <> True) Then
    Debug.WriteLine(http.LastErrorText)
    Exit Sub
End If


' Make sure a successful response was received.
If (resp.StatusCode <> 200) Then
    Debug.WriteLine(resp.StatusLine)
    Debug.WriteLine(resp.Header)
    Debug.WriteLine(resp.BodyStr)
    Exit Sub
End If


' If successful, the resp.BodyStr contains something like this:
' oauth_token=85123455-fF41296Bi3daM8eCo9Y5vZabcdxXpRv864plYPOjr&oauth_token_secret=afiYJOgabcdSfGae7BDvJVVTwys8fUGpra5guZxbmFBZo
Debug.WriteLine(resp.BodyStr)

Dim hashTab As New Chilkat.Hashtable
hashTab.AddQueryParams(resp.BodyStr)

Dim accessToken As String = hashTab.LookupStr("oauth_token")
Dim accessTokenSecret As String = hashTab.LookupStr("oauth_token_secret")



' The access token + secret is what should be saved and used for
' subsequent REST API calls.
Debug.WriteLine("Access Token = " & accessToken)
Debug.WriteLine("Access Token Secret = " & accessTokenSecret)

' Save this access token for future calls.
' Just in case we need user_id and screen_name, save those also..
Dim json As New Chilkat.JsonObject
json.AppendString("oauth_token",accessToken)
json.AppendString("oauth_token_secret",accessTokenSecret)

Dim fac As New Chilkat.FileAccess
fac.WriteEntireTextFile("qa_data/tokens/etrade.json",json.Emit(),"utf-8",False)

Debug.WriteLine("Success.")