(DataFlex) Twitter - Application Only Authentication

Demonstrates how to get a Twitter OAuth2 token for application-only authentication.

This example is deprecated and no longer valid.

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

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

Use ChilkatAx-win32.pkg

Procedure Test
    Boolean iSuccess
    String sConsumerKey
    String sConsumerSecret
    Handle hoHttp
    Variant vReq
    Handle hoReq
    Variant vResp
    Handle hoResp
    Handle hoJson
    String sTemp1
    Integer iTemp1

    Move False To iSuccess

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

    // Note: Define your Twitter apps at https://apps.twitter.com/

    // We're going to send an HTTPS POST that looks like this:

    // POST /oauth2/token HTTP/1.1
    // Host: api.twitter.com
    // User-Agent: My Twitter App v1.0.23
    // Authorization: Basic eHZ6MWV2RlM0d0VFUFRHRUZQSEJvZzpMOHFxOVBaeVJn
    //                      NmllS0dFS2hab2xHQzB2SldMdzhpRUo4OERSZHlPZw==
    // Content-Type: application/x-www-form-urlencoded;charset=UTF-8
    // Content-Length: 29
    // Accept-Encoding: gzip
    // 
    // grant_type=client_credentials

    // Update these values with your consumer key and secret (also known as API key and API secret).
    Move "TWITTER_CONSUMER_KEY" To sConsumerKey
    Move "TWITTER_CONSUMER_SECRET" To sConsumerSecret

    Get Create (RefClass(cComChilkatHttp)) To hoHttp
    If (Not(IsComObjectCreated(hoHttp))) Begin
        Send CreateComObject of hoHttp
    End

    Set ComBasicAuth Of hoHttp To True
    Set ComLogin Of hoHttp To sConsumerKey
    Set ComPassword Of hoHttp To sConsumerSecret

    Get Create (RefClass(cComChilkatHttpRequest)) To hoReq
    If (Not(IsComObjectCreated(hoReq))) Begin
        Send CreateComObject of hoReq
    End
    Send ComAddParam To hoReq "grant_type" "client_credentials"

    Set ComHttpVerb Of hoReq To "POST"
    Set ComContentType Of hoReq To "application/x-www-form-urlencoded"

    Get Create (RefClass(cComChilkatHttpResponse)) To hoResp
    If (Not(IsComObjectCreated(hoResp))) Begin
        Send CreateComObject of hoResp
    End
    Get pvComObject of hoReq to vReq
    Get pvComObject of hoResp to vResp
    Get ComHttpReq Of hoHttp "https://api.twitter.com/oauth2/token" vReq vResp To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoHttp To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get ComStatusCode Of hoResp To iTemp1
    Showln "Response Status Code: " iTemp1

    Get ComStatusCode Of hoResp To iTemp1
    If (iTemp1 <> 200) Begin
        Showln "Expected a 200 response status code for success."
        Get ComBodyStr Of hoResp To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // We should get a JSON response like this:

    // {
    //     "token_type":"bearer",
    //     "access_token":"..."
    // }

    Get Create (RefClass(cComChilkatJsonObject)) To hoJson
    If (Not(IsComObjectCreated(hoJson))) Begin
        Send CreateComObject of hoJson
    End
    Get ComBodyStr Of hoResp To sTemp1
    Get ComLoad Of hoJson sTemp1 To iSuccess

    Get ComStringOf Of hoJson "access_token" To sTemp1
    Showln "Access token = " sTemp1


End_Procedure