(Lianja) 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

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

lcConsumerKey = "ETRADE_CONSUMER_KEY"
lcConsumerSecret = "ETRADE_CONSUMER_SECRET"

lcRequestTokenUrl = "https://apisb.etrade.com/oauth/request_token"
lcAuthorizeUrl = "https://us.etrade.com/e/t/etws/authorize"
lcAccessTokenUrl = "https://apisb.etrade.com/oauth/access_token"

loHttp = createobject("CkHttp")
llSuccess = .T.

loHttp.OAuth1 = .T.
loHttp.OAuthConsumerKey = lcConsumerKey
loHttp.OAuthConsumerSecret = lcConsumerSecret
loHttp.OAuthCallback = "oob"

loJsonRequestToken = createobject("CkJsonObject")
llSuccess = loJsonRequestToken.LoadFile("qa_data/tokens/etrade_request_token.json")
lcRequestToken = loJsonRequestToken.StringOf("oauth_token")
lcRequestTokenSecret = loJsonRequestToken.StringOf("oauth_token_secret")

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

loHttp.OAuthToken = lcRequestToken
loHttp.OAuthTokenSecret = lcRequestTokenSecret

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

loResp = loHttp.QuickGetObj(lcAccessTokenUrl)
if (loHttp.LastMethodSuccess <> .T.) then
    ? loHttp.LastErrorText
    release loHttp
    release loJsonRequestToken
    return
endif

// Make sure a successful response was received.
if (loResp.StatusCode <> 200) then
    ? loResp.StatusLine
    ? loResp.Header
    ? loResp.BodyStr
    release loHttp
    release loJsonRequestToken
    return
endif

// If successful, the resp.BodyStr contains something like this:
// oauth_token=85123455-fF41296Bi3daM8eCo9Y5vZabcdxXpRv864plYPOjr&oauth_token_secret=afiYJOgabcdSfGae7BDvJVVTwys8fUGpra5guZxbmFBZo
? loResp.BodyStr

loHashTab = createobject("CkHashtable")
loHashTab.AddQueryParams(loResp.BodyStr)

lcAccessToken = loHashTab.LookupStr("oauth_token")
lcAccessTokenSecret = loHashTab.LookupStr("oauth_token_secret")

release loResp

// The access token + secret is what should be saved and used for
// subsequent REST API calls.
? "Access Token = " + lcAccessToken
? "Access Token Secret = " + lcAccessTokenSecret

// Save this access token for future calls.
// Just in case we need user_id and screen_name, save those also..
loJson = createobject("CkJsonObject")
loJson.AppendString("oauth_token",lcAccessToken)
loJson.AppendString("oauth_token_secret",lcAccessTokenSecret)

loFac = createobject("CkFileAccess")
loFac.WriteEntireTextFile("qa_data/tokens/etrade.json",loJson.Emit(),"utf-8",.F.)

? "Success."


release loHttp
release loJsonRequestToken
release loHashTab
release loJson
release loFac