(Swift 3,4,5...) 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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func chilkatTest() {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    let oauth2 = CkoOAuth2()!
    var success: Bool

    // 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.
    oauth2.listenPort = 3017

    oauth2.authorizationEndpoint = "https://login.microsoftonline.com/common/oauth2/authorize"
    oauth2.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.
    oauth2.clientId = "MY_AZURE_AD_APP_ID"
    // This is your app key/password/client secret:
    oauth2.clientSecret = "MY_AZURE_AD_APP_KEY"

    oauth2.codeChallenge = false

    // -----------------------------------------------------------
    // 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:

    oauth2.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.
    var url: String? = oauth2.start()
    if oauth2.lastMethodSuccess != true {
        print("\(oauth2.lastErrorText!)")
        return
    }

    // 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.
    var numMsWaited: Int = 0
    while (numMsWaited < 30000) && (oauth2.authFlowState.intValue < 3) {
        oauth2.sleepMs(100)
        numMsWaited = numMsWaited + 100
    }

    // 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 oauth2.authFlowState.intValue < 3 {
        oauth2.cancel()
        print("No response from the browser!")
        return
    }

    // 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 oauth2.authFlowState.intValue == 5 {
        print("OAuth2 failed to complete.")
        print("\(oauth2.failureInfo!)")
        return
    }

    if oauth2.authFlowState.intValue == 4 {
        print("OAuth2 authorization was denied.")
        print("\(oauth2.accessTokenResponse!)")
        return
    }

    if oauth2.authFlowState.intValue != 3 {
        print("Unexpected AuthFlowState:\(oauth2.authFlowState.intValue)")
        return
    }

    print("OAuth2 authorization granted!")
    print("Access Token = \(oauth2.accessToken!)")

    // Get the full JSON response:
    let json = CkoJsonObject()!
    json.load(oauth2.accessTokenResponse)
    json.emitCompact = false

    // 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..."
    // }

    print("\(json.emit()!)")

    // Save the JSON to a file for future requests.
    let fac = CkoFileAccess()!
    fac.writeEntireTextFile("qa_data/tokens/microsoftGraphAzureAD.json", fileData: json.emit(), charset: "utf-8", includePreamble: false)

}