(Lianja) Microsoft Graph OAuth2 App Authentication using Azure AD

Demonstrates how to get a Microsoft Graph OAuth2 access token from a desktop application or script.

The Microsoft Graph supports two authentication providers:

• To authenticate users with personal Microsoft accounts, such as live.com or outlook.com accounts, use the Azure Active Directory (Azure AD) v2.0 endpoint.
• To authenticate users with enterprise (that is, work or school) accounts, use Azure AD.

This example uses the Azure AD endpoint (for enterprise accounts).

This example requires Chilkat v9.5.0.67 or greater.

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

loOauth2 = createobject("CkOAuth2")

// This should be the port in the localhost callback URL for your app.  
// The callback URL would look like "http://localhost:3017/" if the port number is 3017.
loOauth2.ListenPort = 3017

loOauth2.AuthorizationEndpoint = "https://login.microsoftonline.com/common/oauth2/authorize"
loOauth2.TokenEndpoint = "https://login.microsoftonline.com/common/oauth2/token"

// -----------------------------------------------------------------------------
// Important: Notice that the above endpoints are the "Azure AD" endpoints, not
// the "Azure AD v2.0" endpoints.  The 2.0 endpoints are very similar. They are:
// https://login.microsoftonline.com/common/oauth2/v2.0/authorize
// and
// https://login.microsoftonline.com/common/oauth2/v2.0/token
// Pay close attention to the endpoints to make sure they match what you want.
// -----------------------------------------------------------------------------

// Replace these with actual values.
loOauth2.ClientId = "MY_AZURE_AD_APP_ID"
// This is your app key/password/client secret:
loOauth2.ClientSecret = "MY_AZURE_AD_APP_KEY"

loOauth2.CodeChallenge = .F.

// -----------------------------------------------------------
// Important difference between "Azure AD" and "Azure AD v2.0"
// 
// When using the Azure AD v2.0, endpoints (for personal accounts), the desired
// scopes are selected by setting the OAuth2 Scope property here.
// However, when using the "Azure AD" endpoints, we DO NOT set the Scope here,
// but instead set the OAuth2 Resource property, as shown here:

loOauth2.Resource = "https://graph.microsoft.com/"

// When using the "Azure AD" endpoint, the access token we receive will automatically
// be for the scopes matching the permissions granted for the app during the app's registration.

// Begin the OAuth2 three-legged flow.  This returns a URL that should be loaded in a browser.
lcUrl = loOauth2.StartAuth()
if (loOauth2.LastMethodSuccess <> .T.) then
    ? loOauth2.LastErrorText
    release loOauth2
    return
endif

// At this point, your application should load the URL in a browser.
// For example, 
// in C#: System.Diagnostics.Process.Start(url);
// in Java: Desktop.getDesktop().browse(new URI(url));
// in VBScript: Set wsh=WScript.CreateObject("WScript.Shell")
//              wsh.Run url
// in Xojo: ShowURL(url)  (see http://docs.xojo.com/index.php/ShowURL)
// in Dataflex: Runprogram Background "c:\Program Files\Internet Explorer\iexplore.exe" sUrl        
// The Microsoft account owner would interactively accept or deny the authorization request.

// Add the code to load the url in a web browser here...

// Now wait for the authorization.
// We'll wait for a max of 30 seconds.
lnNumMsWaited = 0
do while (lnNumMsWaited < 30000) and (loOauth2.AuthFlowState < 3)
    loOauth2.SleepMs(100)
    lnNumMsWaited = lnNumMsWaited + 100
enddo

// If there was no response from the browser within 30 seconds, then 
// the AuthFlowState will be equal to 1 or 2.
// 1: Waiting for Redirect. The OAuth2 background thread is waiting to receive the redirect HTTP request from the browser.
// 2: Waiting for Final Response. The OAuth2 background thread is waiting for the final access token response.
// In that case, cancel the background task started in the call to StartAuth.
if (loOauth2.AuthFlowState < 3) then
    loOauth2.Cancel()
    ? "No response from the browser!"
    release loOauth2
    return
endif

// Check the AuthFlowState to see if authorization was granted, denied, or if some error occurred
// The possible AuthFlowState values are:
// 3: Completed with Success. The OAuth2 flow has completed, the background thread exited, and the successful JSON response is available in AccessTokenResponse property.
// 4: Completed with Access Denied. The OAuth2 flow has completed, the background thread exited, and the error JSON is available in AccessTokenResponse property.
// 5: Failed Prior to Completion. The OAuth2 flow failed to complete, the background thread exited, and the error information is available in the FailureInfo property.
if (loOauth2.AuthFlowState = 5) then
    ? "OAuth2 failed to complete."
    ? loOauth2.FailureInfo
    release loOauth2
    return
endif

if (loOauth2.AuthFlowState = 4) then
    ? "OAuth2 authorization was denied."
    ? loOauth2.AccessTokenResponse
    release loOauth2
    return
endif

if (loOauth2.AuthFlowState <> 3) then
    ? "Unexpected AuthFlowState:" + str(loOauth2.AuthFlowState)
    release loOauth2
    return
endif

? "OAuth2 authorization granted!"
? "Access Token = " + loOauth2.AccessToken

// Get the full JSON response:
loJson = createobject("CkJsonObject")
loJson.Load(loOauth2.AccessTokenResponse)
loJson.EmitCompact = .F.

// The JSON response looks like this:
// (Note: The scope property value should match the permissions granted for the app during the app's registration.)

// {
//     "token_type":"Bearer",
//     "scope": "Calendar.ReadWrite Directory.Read.All Files.ReadWrite Group.ReadWrite.All Mail.ReadWrite Mail.Send User.ReadBasic.All",
//     "expires_in":"3599",
//     "ext_expires_in": "0",
//     "expires_on":"1426551729",
//     "not_before":"1426547829",
//     "resource":"https://graph.microsoft.com/",
//     "access_token":"eyJ0eXAiOiJKV1QiLCJhb...",
//     "refresh_token":"AAABAAAAvPM1KaPlrEqd...",
//     "id_token":"eyJ0eXAiOiJKV1QiLCJhbGci..."
// }

? loJson.Emit()

// Save the JSON to a file for future requests.
loFac = createobject("CkFileAccess")
loFac.WriteEntireTextFile("qa_data/tokens/microsoftGraphAzureAD.json",loJson.Emit(),"utf-8",.F.)


release loOauth2
release loJson
release loFac