(PureBasic) Twitter - Application Only Authentication

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

This example is deprecated and no longer valid.

Chilkat PureBasic Module Download Chilkat PureBasic Module

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

Procedure ChilkatExample()

    ; 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")

    resp.i = CkHttp::ckPostUrlEncoded(http,"https://api.twitter.com/oauth2/token",req)
    If CkHttp::ckLastMethodSuccess(http) <> 1
        Debug CkHttp::ckLastErrorText(http)
        CkHttp::ckDispose(http)
        CkHttpRequest::ckDispose(req)
        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)
        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")

    CkHttpResponse::ckDispose(resp)



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


    ProcedureReturn
EndProcedure