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(VB.NET UWP/WinRT) Xero API through an HTTP Proxy

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

This example requires Chilkat v9.5.0.64 or later

Chilkat Universal Windows Platform (UWP) / WinRT Downloads

Chilkat for the Universal Windows Platform (UWP)

'  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.
Dim rest As New Chilkat.Rest

'  Connect to the Xero server through an HTTP proxy, and then tell the REST object
'  to use the socket connection.
Dim socket As New Chilkat.Socket

'  Set the HTTP proxy domain or IP address, and port.
socket.HttpProxyHostname = "192.168.1.100"
socket.HttpProxyPort = 8088

'  Connect through the HTTP proxy..
Dim bTls As Boolean = True
Dim port As Integer = 443
Dim maxWaitMs As Integer = 5000
Dim success As Boolean = Await socket.ConnectAsync("api.xero.com",port,bTls,maxWaitMs)
If (success <> True) Then
    Debug.WriteLine("Connect Failure Error Code: " & socket.ConnectFailReason)
    Debug.WriteLine(socket.LastErrorText)
    Exit Sub
End If


'  Use the HTTP proxied TLS connection:
success = rest.UseConnection(socket,True)
If (success <> True) Then
    Debug.WriteLine(rest.LastErrorText)
    Exit Sub
End If


'  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..

Dim consumerKey As String = "XERO_PRIVATE_APP_KEY"
Dim consumerSecret As String = "XERO_PRIVATE_APP_SECRET"

'  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.
Dim pfx As New Chilkat.Pfx
success = pfx.LoadPfxFile("qa_data/certs/xero_private_app/public_privatekey.pfx","PFX_PASSWORD")
If (success <> True) Then
    Debug.WriteLine(pfx.LastErrorText)
    Exit Sub
End If

Dim privKeyFromPfx As Chilkat.PrivateKey = pfx.GetPrivateKey(0)
If (pfx.LastMethodSuccess <> True) Then
    Debug.WriteLine(pfx.LastErrorText)
    Exit Sub
End If


'  Or we can load from a PEM..
Dim privKeyFromPem As New Chilkat.PrivateKey
success = privKeyFromPem.LoadPemFile("qa_data/certs/xero_private_app/privatekey.pem")
If (success <> True) Then
    Debug.WriteLine(privKeyFromPem.LastErrorText)
    Exit Sub
End If


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

Dim oauth1 As New Chilkat.OAuth1
oauth1.ConsumerKey = consumerKey
oauth1.ConsumerSecret = consumerSecret
oauth1.Token = consumerKey
oauth1.TokenSecret = consumerSecret
oauth1.SignatureMethod = "RSA-SHA1"
oauth1.SetRsaKey(privKeyFromPfx)


'  Install the OAuth1 authenticator.
rest.SetAuthOAuth1(oauth1,False)

Debug.WriteLine("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.
Dim sbXml As New Chilkat.StringBuilder
success = Await rest.FullRequestNoBodySbAsync("GET","/api.xro/2.0/Contacts",sbXml)
If (success <> True) Then
    Debug.WriteLine(rest.LastErrorText)
    Exit Sub
End If


'  A 200 response is expected for actual success.
If (rest.ResponseStatusCode <> 200) Then
    Debug.WriteLine(sbXml.GetAsString())
    Exit Sub
End If


'  Iterate over the contacts..
Dim bAutoTrim As Boolean = False
Dim xml As New Chilkat.Xml
xml.LoadSb(sbXml,bAutoTrim)
xml.SaveXml("qa_cache/xero_contacts.xml")

'  How many records exist?
Dim recordCount As Integer = xml.NumChildrenAt("Contacts")
Debug.WriteLine("numRecords = " & recordCount)

Dim i As Integer = 0
While i < recordCount
    xml.I = i
    Debug.WriteLine("ContactID: " & xml.GetChildContent("Contacts|Contact[i]|ContactID"))
    i = i + 1
End While

 

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