(VB.NET) ETrade OAuth1 Authorization (3-legged) Step 1

Demonstrates the first step in 3-legged OAuth1 authorization for the ETrade REST API. This example sends an HTTP request to the "request token URL" to get a request token that begins the OAuth1 process. (See https://apisb.etrade.com/docs/api/authorization/request_token.html )

This example uses the sandbox request token URL. The live request token URL would be "https://api.etrade.com/oauth/request_token".

Note: This example requires Chilkat v11.0.0 or greater.

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Dim success As Boolean = False

' 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"

' Note: This example uses the sandbox request token URL.
' The live Get Request Token Request URL is:
' https://api.etrade.com/oauth/request_token
' This example will use the Sandbox Token Request URL:
Dim requestTokenUrl As String = "https://apisb.etrade.com/oauth/request_token"

Dim http As New Chilkat.Http
success = True

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

Dim resp As New Chilkat.HttpResponse
success = http.HttpNoBody("GET",requestTokenUrl,resp)
If (success = False) Then
    Debug.WriteLine(http.LastErrorText)
    Exit Sub
End If


' If successful, the resp.BodyStr contains something like this:  
' oauth_token=-Wa_KwAAAAAAxfEPAAABV8Qar4Q&oauth_token_secret=OfHY4tZBX2HK4f7yIw76WYdvnl99MVGB&oauth_callback_confirmed=true
Debug.WriteLine(resp.BodyStr)

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

Dim requestToken As String = hashTab.LookupStr("oauth_token")
Dim requestTokenSecret As String = hashTab.LookupStr("oauth_token_secret")
http.OAuthTokenSecret = requestTokenSecret

Debug.WriteLine("oauth_token = " & requestToken)
Debug.WriteLine("oauth_token_secret = " & requestTokenSecret)

' Save this request token for the next step..
Dim json As New Chilkat.JsonObject
json.AppendString("oauth_token",requestToken)
json.AppendString("oauth_token_secret",requestTokenSecret)

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

' ---------------------------------------------------------------------------

' The next step is to form a URL to send to the authorizeUrl
' This is an HTTP GET that we load into a popup browser.
Dim authorizeUrl As String = "https://us.etrade.com/e/t/etws/authorize"

Dim sbUrlForBrowser As New Chilkat.StringBuilder
sbUrlForBrowser.Append(authorizeUrl)
sbUrlForBrowser.Append("?key=")
sbUrlForBrowser.Append(consumerKey)
sbUrlForBrowser.Append("&token=")
sbUrlForBrowser.Append(requestToken)
Dim url As String = sbUrlForBrowser.GetAsString()

' Launch the system's default browser navigated to the URL.
Dim oauth2 As New Chilkat.OAuth2
success = oauth2.LaunchBrowser(url)
If (success = False) Then
    Debug.WriteLine(oauth2.LastErrorText)
    Exit Sub
End If


' The ETrade account owner will login and grant access to the application.
' A short verifier code will be displayed (as shown below), and this must be copy-and-pasted
' into the next step to Complete the 3-legged OAuth1 Authorization 

' Note: The browser will NOT automatically direct you to the next page.
' You should copy the verifier code, close the browser, and then paste the verifier
' code into your application.

'