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DataFlex Web API Examples

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(DataFlex) Xero API through an SOCKS Proxy

This example demonstrates connecting through a SOCKS proxy w/ 2-legged OAuth for a Xero private application.

This example requires Chilkat v9.5.0.64 or later

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

Use ChilkatAx-9.5.0-win32.pkg

Procedure Test
    Handle hoRest
    Variant vSocket
    Handle hoSocket
    Boolean iBTls
    Integer iPort
    Integer iMaxWaitMs
    Boolean iSuccess
    String sConsumerKey
    String sConsumerSecret
    Handle hoPfx
    Variant vPrivKeyFromPfx
    Handle hoPrivKeyFromPfx
    Handle hoPrivKeyFromPem
    Variant vOauth1
    Handle hoOauth1
    Variant vSbXml
    Handle hoSbXml
    Boolean iBAutoTrim
    Handle hoXml
    Integer iRecordCount
    Integer i
    String sTemp1
    Integer iTemp1
    Boolean bTemp1

    // This example requires Chilkat v9.5.0.64 or later

    // This sample code would typically be placed in a subroutine or function
    // where the rest object is passed by reference.
    // It does the OAuth1 setup and makes the initial connection.
    Get Create (RefClass(cComChilkatRest)) To hoRest
    If (Not(IsComObjectCreated(hoRest))) Begin
        Send CreateComObject of hoRest
    End

    // Connect to the Xero server through an HTTP proxy, and then tell the REST object
    // to use the socket connection.
    Get Create (RefClass(cComChilkatSocket)) To hoSocket
    If (Not(IsComObjectCreated(hoSocket))) Begin
        Send CreateComObject of hoSocket
    End

    // Set the SOCKS proxy domain or IP address, port, and SOCKS version number (4 or 5)
    Set ComSocksHostname Of hoSocket To "192.168.1.100"
    Set ComSocksPort Of hoSocket To 1080
    Set ComSocksVersion Of hoSocket To 5
    // Other properties exist for specifying a SOCKS proxy login and password,
    // but these are not used in this example.

    // Connect through the SOCKS proxy..
    Move True To iBTls
    Move 443 To iPort
    Move 5000 To iMaxWaitMs
    Get ComConnect Of hoSocket "api.xero.com" iPort iBTls iMaxWaitMs To iSuccess
    If (iSuccess <> True) Begin
        Get ComConnectFailReason Of hoSocket To iTemp1
        Showln "Connect Failure Error Code: " iTemp1
        Get ComLastErrorText Of hoSocket To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Use the SOCKS proxied TLS connection:
    Get pvComObject of hoSocket to vSocket
    Get ComUseConnection Of hoRest vSocket True To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoRest To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // OK, we're connected.  
    // The UseConnection method has an internal reference to the underlying/internal socket.
    // The application can does not need to keep its socket object in existence.
    // -----------------------------------------------------------------
    // Now setup the OAuth1 authenticator..

    Move "XERO_PRIVATE_APP_KEY" To sConsumerKey
    Move "XERO_PRIVATE_APP_SECRET" To sConsumerSecret

    // Let's get our private key from our PFX (password protected), or the PEM (unprotected).
    // You can decide which to use.  Either is OK, although I would recommend keeping your
    // private keys in a PFX and not in an unprotected PEM.
    Get Create (RefClass(cComChilkatPfx)) To hoPfx
    If (Not(IsComObjectCreated(hoPfx))) Begin
        Send CreateComObject of hoPfx
    End
    Get ComLoadPfxFile Of hoPfx "qa_data/certs/xero_private_app/public_privatekey.pfx" "PFX_PASSWORD" To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoPfx To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get ComGetPrivateKey Of hoPfx 0 To vPrivKeyFromPfx
    If (IsComObject(vPrivKeyFromPfx)) Begin
        Get Create (RefClass(cComChilkatPrivateKey)) To hoPrivKeyFromPfx
        Set pvComObject Of hoPrivKeyFromPfx To vPrivKeyFromPfx
    End
    Get ComLastMethodSuccess Of hoPfx To bTemp1
    If (bTemp1 <> True) Begin
        Get ComLastErrorText Of hoPfx To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Or we can load from a PEM..
    Get Create (RefClass(cComChilkatPrivateKey)) To hoPrivKeyFromPem
    If (Not(IsComObjectCreated(hoPrivKeyFromPem))) Begin
        Send CreateComObject of hoPrivKeyFromPem
    End
    Get ComLoadPemFile Of hoPrivKeyFromPem "qa_data/certs/xero_private_app/privatekey.pem" To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoPrivKeyFromPem To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Note: There are many other means for loading a private key, including
    // from other formats and directly from memory (i.e. not file-based).

    Get Create (RefClass(cComChilkatOAuth1)) To hoOauth1
    If (Not(IsComObjectCreated(hoOauth1))) Begin
        Send CreateComObject of hoOauth1
    End
    Set ComConsumerKey Of hoOauth1 To sConsumerKey
    Set ComConsumerSecret Of hoOauth1 To sConsumerSecret
    Set ComToken Of hoOauth1 To sConsumerKey
    Set ComTokenSecret Of hoOauth1 To sConsumerSecret
    Set ComSignatureMethod Of hoOauth1 To "RSA-SHA1"
    Get ComSetRsaKey Of hoOauth1 vPrivKeyFromPfx To iSuccess
    Send Destroy of hoPrivKeyFromPfx

    // Install the OAuth1 authenticator.
    Get pvComObject of hoOauth1 to vOauth1
    Get ComSetAuthOAuth1 Of hoRest vOauth1 False To iSuccess

    Showln "OK, the Xero OAuth1 is initialized and the REST object is ready to make REST API calls.."

    // -----------------------------------------------------------------
    // Make a call to verify that OAuth1 through an HTTP proxy works..

    // Get the full list of contacts.
    Get Create (RefClass(cComChilkatStringBuilder)) To hoSbXml
    If (Not(IsComObjectCreated(hoSbXml))) Begin
        Send CreateComObject of hoSbXml
    End
    Get pvComObject of hoSbXml to vSbXml
    Get ComFullRequestNoBodySb Of hoRest "GET" "/api.xro/2.0/Contacts" vSbXml To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoRest To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // A 200 response is expected for actual success.
    Get ComResponseStatusCode Of hoRest To iTemp1
    If (iTemp1 <> 200) Begin
        Get ComGetAsString Of hoSbXml To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Iterate over the contacts..
    Move False To iBAutoTrim
    Get Create (RefClass(cComChilkatXml)) To hoXml
    If (Not(IsComObjectCreated(hoXml))) Begin
        Send CreateComObject of hoXml
    End
    Get pvComObject of hoSbXml to vSbXml
    Get ComLoadSb Of hoXml vSbXml iBAutoTrim To iSuccess
    Get ComSaveXml Of hoXml "qa_cache/xero_contacts.xml" To iSuccess

    // How many records exist?
    Get ComNumChildrenAt Of hoXml "Contacts" To iRecordCount
    Showln "numRecords = " iRecordCount

    Move 0 To i
    While (i < iRecordCount)
        Set ComI Of hoXml To i
        Get ComGetChildContent Of hoXml "Contacts|Contact[i]|ContactID" To sTemp1
        Showln "ContactID: " sTemp1
        Move i + 1 To i
    Loop



End_Procedure

 

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