PureBasic Requires Chilkat v11.0.0+

Twitter - Application Only Authentication

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

This example is deprecated and no longer valid.

PureBasic

IncludeFile "CkHttpResponse.pb"
IncludeFile "CkHttp.pb"
IncludeFile "CkJsonObject.pb"
IncludeFile "CkHttpRequest.pb"

Procedure ChilkatExample()

    success.i = 0

    ;  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).
    consumerKey.s = "TWITTER_CONSUMER_KEY"
    consumerSecret.s = "TWITTER_CONSUMER_SECRET"

    http.i = CkHttp::ckCreate()
    If http.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkHttp::setCkBasicAuth(http, 1)
    CkHttp::setCkLogin(http, consumerKey)
    CkHttp::setCkPassword(http, consumerSecret)

    req.i = CkHttpRequest::ckCreate()
    If req.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkHttpRequest::ckAddParam(req,"grant_type","client_credentials")

    CkHttpRequest::setCkHttpVerb(req, "POST")
    CkHttpRequest::setCkContentType(req, "application/x-www-form-urlencoded")

    resp.i = CkHttpResponse::ckCreate()
    If resp.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    success = CkHttp::ckHttpReq(http,"https://api.twitter.com/oauth2/token",req,resp)
    If success = 0
        Debug CkHttp::ckLastErrorText(http)
        CkHttp::ckDispose(http)
        CkHttpRequest::ckDispose(req)
        CkHttpResponse::ckDispose(resp)
        ProcedureReturn
    EndIf

    Debug "Response Status Code: " + Str(CkHttpResponse::ckStatusCode(resp))

    If CkHttpResponse::ckStatusCode(resp) <> 200
        Debug "Expected a 200 response status code for success."
        Debug CkHttpResponse::ckBodyStr(resp)
        CkHttp::ckDispose(http)
        CkHttpRequest::ckDispose(req)
        CkHttpResponse::ckDispose(resp)
        ProcedureReturn
    EndIf

    ;  We should get a JSON response like this:

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

    json.i = CkJsonObject::ckCreate()
    If json.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkJsonObject::ckLoad(json,CkHttpResponse::ckBodyStr(resp))

    Debug "Access token = " + CkJsonObject::ckStringOf(json,"access_token")


    CkHttp::ckDispose(http)
    CkHttpRequest::ckDispose(req)
    CkHttpResponse::ckDispose(resp)
    CkJsonObject::ckDispose(json)


    ProcedureReturn
EndProcedure