(Visual FoxPro) Twitter PIN-Based Authorization (Step 1)

Demonstrates the 1st step in Twitter PIN-based authorization using OAuth. The purpose of this step is to obtain a temporary request token that will be traded for an access token + secret in the final step. Once the access token + secret is obtained, the application can access the Twitter account in whatever ways it was authorized.

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

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

LOCAL lnSuccess
LOCAL loHttp
LOCAL loReq
LOCAL loResp
LOCAL lcOauthToken
LOCAL lcOauthTokenSecret
LOCAL lcOauthCbConfirmed

lnSuccess = 0

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

loHttp = CreateObject('Chilkat.Http')

loHttp.OAuth1 = 1
loHttp.OAuthConsumerKey = "my-consumer-key"
loHttp.OAuthConsumerSecret = "my-consumer-secret"

loReq = CreateObject('Chilkat.HttpRequest')
loReq.HttpVerb = "POST"
loReq.ContentType = "application/x-www-form-urlencoded"

loResp = CreateObject('Chilkat.HttpResponse')
lnSuccess = loHttp.HttpReq("https://api.twitter.com/oauth/request_token",loReq,loResp)
IF (lnSuccess = 0) THEN
    ? loHttp.LastErrorText
    RELEASE loHttp
    RELEASE loReq
    RELEASE loResp
    CANCEL
ENDIF

IF (loResp.StatusCode = 200) THEN

    lcOauthToken = loResp.UrlEncParamValue(loResp.BodyStr,"oauth_token")
    ? "OAuth temporary request token = " + lcOauthToken

    lcOauthTokenSecret = loResp.UrlEncParamValue(loResp.BodyStr,"oauth_token_secret")
    ? "OAuth temporary token secret = " + lcOauthTokenSecret

    lcOauthCbConfirmed = loResp.UrlEncParamValue(loResp.BodyStr,"oauth_callback_confirmed")
    ? "OAuth callback confirmed  = " + lcOauthCbConfirmed

    * At this point, the end-user needs to browse to the following
    * Twitter URL to log in to his/her Twitter account and get a PIN.
    * 
    * https://api.twitter.com/oauth/authenticate?oauth_token=OAUTH_TOKEN
    * 
    * (where OAUTH_TOKEN is replaced with the contents
    * of the OAuth temporary request token.)

    * Your application may have an embedded browser such
    * that it automatically navigates to the above URL, or it may
    * be necessary for the user to browse to this URL independently.

    * Once the PIN is obtained, your application should provide a means
    * for the end-user to enter it (by typing it into an input text box, for example), 
    * and then Step 2 (the final step) can begin.

ELSE
    ? loHttp.LastErrorText
ENDIF

RELEASE loHttp
RELEASE loReq
RELEASE loResp