(DataFlex) RSAP Union API - Get OAuth2 Access Token

Demonstrates how to get an OAuth2 access token for the RSAP Union API. Note: This uses the client credentials flow, which does NOT require an interactive engagement using a browser.

For more information, see https://app.swaggerhub.com/apis-docs/pderas/RSAP/2.0.1#/Authentication/getOauthToken

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

Use ChilkatAx-9.5.0-win32.pkg

Procedure Test
    Handle hoHttp
    Boolean iSuccess
    Variant vJson
    Handle hoJson
    Variant vCert
    Handle hoCert
    Variant vPrivKey
    Handle hoPrivKey
    Variant vResp
    Handle hoResp
    Variant vSbResponseBody
    Handle hoSbResponseBody
    Handle hoJResp
    Integer iRespStatusCode
    String sTemp1
    Boolean bTemp1

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

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

    // The following JSON is sent in the request body.

    // {
    //   "grant_type": "client_credentials",
    //   "client_id": 1234,
    //   "client_secret": "23456abcde"
    // }

    Get Create (RefClass(cComChilkatJsonObject)) To hoJson
    If (Not(IsComObjectCreated(hoJson))) Begin
        Send CreateComObject of hoJson
    End
    Get ComUpdateString Of hoJson "grant_type" "client_credentials" To iSuccess
    Get ComUpdateInt Of hoJson "client_id" 1234 To iSuccess
    Get ComUpdateString Of hoJson "client_secret" "23456abcde" To iSuccess

    Send ComSetRequestHeader To hoHttp "Content-type" "application/json"

    // Add the client certificate TLS authentication.
    Get Create (RefClass(cComChilkatCert)) To hoCert
    If (Not(IsComObjectCreated(hoCert))) Begin
        Send CreateComObject of hoCert
    End
    Get ComLoadFromFile Of hoCert "qa_data/certs_and_keys/union_client_certificate.crt" To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoCert To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get Create (RefClass(cComChilkatPrivateKey)) To hoPrivKey
    If (Not(IsComObjectCreated(hoPrivKey))) Begin
        Send CreateComObject of hoPrivKey
    End
    Get ComLoadAnyFormatFile Of hoPrivKey "qa_data/certs_and_keys/union_client_certificate.nopass.key" "" To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoPrivKey To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Associate the private key with the cert.
    // This will fail if the private key is not actually the correct one that corresponds to the public key stored within the cert.
    Get pvComObject of hoPrivKey to vPrivKey
    Get ComSetPrivateKey Of hoCert vPrivKey To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoCert To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Tell HTTP to use the cert for client TLS certificate authentication.
    Get pvComObject of hoCert to vCert
    Get ComSetSslClientCert Of hoHttp vCert To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoHttp To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get pvComObject of hoJson to vJson
    Get ComPostJson3 Of hoHttp "https://api-test.rsap.ca/oauth/token" "application/json" vJson To vResp
    If (IsComObject(vResp)) Begin
        Get Create (RefClass(cComChilkatHttpResponse)) To hoResp
        Set pvComObject Of hoResp To vResp
    End
    Get ComLastMethodSuccess Of hoHttp To bTemp1
    If (bTemp1 = False) Begin
        Get ComLastErrorText Of hoHttp To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get Create (RefClass(cComChilkatStringBuilder)) To hoSbResponseBody
    If (Not(IsComObjectCreated(hoSbResponseBody))) Begin
        Send CreateComObject of hoSbResponseBody
    End
    Get pvComObject of hoSbResponseBody to vSbResponseBody
    Get ComGetBodySb Of hoResp vSbResponseBody To iSuccess
    Get Create (RefClass(cComChilkatJsonObject)) To hoJResp
    If (Not(IsComObjectCreated(hoJResp))) Begin
        Send CreateComObject of hoJResp
    End
    Get pvComObject of hoSbResponseBody to vSbResponseBody
    Get ComLoadSb Of hoJResp vSbResponseBody To iSuccess
    Set ComEmitCompact Of hoJResp To False

    Showln "Response Body:"
    Get ComEmit Of hoJResp To sTemp1
    Showln sTemp1

    Get ComStatusCode Of hoResp To iRespStatusCode
    Showln "Response Status Code = " iRespStatusCode
    If (iRespStatusCode >= 400) Begin
        Showln "Response Header:"
        Get ComHeader Of hoResp To sTemp1
        Showln sTemp1
        Showln "Failed."
        Send Destroy of hoResp
        Procedure_Return
    End

    Send Destroy of hoResp

    // Sample JSON response:
    // (Sample code for parsing the JSON response is shown below)

    // {
    //   "token_type": "Bearer",
    //   "expires_in": 3600,
    //   "access_token": "eyJ0eXAi...LnE"
    // }

    // This token expires in 1 hour.  Your application could re-use the same token for up to an hour,
    // or it can simply get a new access token before each request (if you're not doing too many requests).
    Get ComWriteFile Of hoJResp "qa_data/tokens/rsapToken.json" To iSuccess


End_Procedure