(PowerBuilder) Refresh Expiring OAuth2 Access Token for Azure Registered App

See more OAuth2 Examples

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

integer li_rc
oleobject loo_Json
integer li_Success
oleobject loo_DtExpire
oleobject loo_Oauth2
oleobject loo_Fac

// We previously obtained an access token and saved the JSON to a file using this example:
// Get OAuth2 Access Token for Azure Registered App

// This example will examine the JSON and expiration date, and if near expiration will
// refresh the access token.

loo_Json = create oleobject
// Use "Chilkat_9_5_0.JsonObject" for versions of Chilkat < 10.0.0
li_rc = loo_Json.ConnectToNewObject("Chilkat.JsonObject")
if li_rc < 0 then
    destroy loo_Json
    MessageBox("Error","Connecting to COM object failed")
    return
end if
li_Success = loo_Json.LoadFile("qa_data/tokens/_myAzureApp.json")
if li_Success <> 1 then
    Write-Debug "Failed to load the access token."
    destroy loo_Json
    return
end if

// The contents of the JSON look like this:
// {
//   "token_type": "Bearer",
//   "scope": "User.Read Mail.ReadWrite Mail.Send",
//   "expires_in": 3600,
//   "ext_expires_in": 0,
//   "access_token": "EwBAA8l6B...",
//   "refresh_token": "MCRMdbe6Cd...",
//   "id_token": "eyJ0eXAiOiJ...",
//   "expires_on": "1494112119"
// }

// The "expires_on" value is a Unix time.
loo_DtExpire = create oleobject
// Use "Chilkat_9_5_0.CkDateTime" for versions of Chilkat < 10.0.0
li_rc = loo_DtExpire.ConnectToNewObject("Chilkat.CkDateTime")

loo_DtExpire.SetFromUnixTime(0,loo_Json.IntOf("expires_on"))

// If this date/time expires within 10 minutes of the current system time, refresh the token.
if loo_DtExpire.ExpiresWithin(10,"minutes") <> 1 then
    Write-Debug "No need to refresh, the access token won't expire within the next 10 minutes."
    destroy loo_Json
    destroy loo_DtExpire
    return
end if

// OK, we need to refresh the access token..
loo_Oauth2 = create oleobject
// Use "Chilkat_9_5_0.OAuth2" for versions of Chilkat < 10.0.0
li_rc = loo_Oauth2.ConnectToNewObject("Chilkat.OAuth2")

// Note: The endpoint depends on the Azure App Registration.
// See How to Choose the Correct Endpoints for your Azure App Registration
loo_Oauth2.TokenEndpoint = "https://login.microsoftonline.com/common/oauth2/v2.0/token"

// Use your client ID.
loo_Oauth2.ClientId = "CLIENT_ID"

// Get the existing refresh token.
loo_Oauth2.RefreshToken = loo_Json.StringOf("refresh_token")

// Send the HTTP POST to refresh the access token.
li_Success = loo_Oauth2.RefreshAccessToken()
if li_Success = 0 then
    Write-Debug loo_Oauth2.LastErrorText
    destroy loo_Json
    destroy loo_DtExpire
    destroy loo_Oauth2
    return
end if

Write-Debug "OAuth2 authorization granted!"
Write-Debug "Access Token = " + loo_Oauth2.AccessToken

// Get the full JSON response:
loo_Json.Load(loo_Oauth2.AccessTokenResponse)
loo_Json.EmitCompact = 0

// If an "expires_on" member does not exist, then add the JSON member by
// getting the current system date/time and adding the "expires_in" seconds.
// This way we'll know when the token expires.
if loo_Json.HasMember("expires_on") <> 1 then
    loo_DtExpire.SetFromCurrentSystemTime()
    loo_DtExpire.AddSeconds(loo_Json.IntOf("expires_in"))
    loo_Json.AppendString("expires_on",loo_DtExpire.GetAsUnixTimeStr(0))
end if

Write-Debug loo_Json.Emit()

// Save the new access token JSON to a file for future requests.
loo_Fac = create oleobject
// Use "Chilkat_9_5_0.FileAccess" for versions of Chilkat < 10.0.0
li_rc = loo_Fac.ConnectToNewObject("Chilkat.FileAccess")

loo_Fac.WriteEntireTextFile("qa_data/tokens/_myAzureApp.json",loo_Json.Emit(),"utf-8",0)


destroy loo_Json
destroy loo_DtExpire
destroy loo_Oauth2
destroy loo_Fac