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(Swift 2) Office365 OAuth2 Access Token for SMTP, IMAP, POP

Demonstrates how to get an OAuth2 access token for use in the SMTP, IMAP, and POP3 protocols.

Chilkat Downloads for the Swift Programming Language

MAC OS X (Cocoa) Objective-C/Swift Libs

iOS Objective-C/Swift Libs

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

    // -----------------------------------------------------------------------------------------------
    // Important:  Setup your App Registration in Azure beforehand.  Here are the steps:
    // 
    // 1) In the Azure portal, go to Azure Active Directory.  In "App registrations" create a "+ New registration".  
    //    See Create New App
    // 
    // 2) Register the app with Redirect URI = "http://localhost:3017/".   
    //    See Register App
    // 
    // 3) Goto "API permissions" to add permissions.  For this OAuth2 authorization flow, we'll add "Delegated permissions".
    //    See Add Delegated permissions
    // 
    // 4) Add SMTP.Send, IMAP.AccessAsUser.All, POP.AccessAsUser.All and offline_access permissions.
    //    See Add SMTP, IMAP, POP permissions
    // 
    // 5) Go to "Certificates & secrets" and add a new client secret.
    //    See Add New Client Secret
    // 
    // 6) In "App registrations", go to "Endpoints" (located to the right of the "+ New registration" link.)
    //    Note your endpoints for "OAuth 2.0 authorization endpoint (v2)" and "OAuth 2.0 token endpoint (v2)"
    //    See Office365 OAuth2 Endpoints
    // 
    // 7) Also, just in case, go to  your Microsoft 365 admin center (this is not Azure).
    //    Go to your Active users.  Click on a user to find the "Manage email apps" link.
    //    See Microsoft 365 Manage Email Apps
    // 
    // 8) Click on "Manage email apps".  Then make sure the "Authenticated SMTP" checkbox is checked.
    //    See Microsoft 365 Admin Authenticated SMTP
    // -----------------------------------------------------------------------------------------------

    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

    // Use your OAuth2 authorization endpoints (v2)
    oauth2.AuthorizationEndpoint = "https://login.microsoftonline.com/xxxxxxxxxx-71bf-4ebe-a866-738364321bf2/oauth2/v2.0/authorize"
    oauth2.TokenEndpoint = "https://login.microsoftonline.com/xxxxxxxxxx-71bf-4ebe-a866-738364321bf2/oauth2/v2.0/token"

    // Replace these with actual values.
    oauth2.ClientId = "CLIENT_ID"
    oauth2.ClientSecret = "CLIENT_SECRET"

    oauth2.CodeChallenge = false

    // Provide a SPACE separated list of scopes.
    // Important: The offline_access scope is needed to get a refresh token.
    oauth2.Scope = "openid profile offline_access https://outlook.office365.com/SMTP.Send https://outlook.office365.com/POP.AccessAsUser.All https://outlook.office365.com/IMAP.AccessAsUser.All"

    // Begin the OAuth2 three-legged flow.  This returns a URL that should be loaded in a browser.
    var url: String? = oauth2.StartAuth()
    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...
    // Add the code to load the url in a web browser here...
    // 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:
    // 
    // {
    //   "token_type": "Bearer",
    //   "scope": "IMAP.AccessAsUser.All openid POP.AccessAsUser.All profile SMTP.Send email",
    //   "expires_in": 3599,
    //   "ext_expires_in": 3599,
    //   "access_token": "...",
    //   "refresh_token": "...",
    //   "id_token": "...",
    //   "expires_on": "1592748507"
    // }

    print("\(json.Emit())")

    // Save the JSON to a file for future requests.
    let fac = CkoFileAccess()
    fac.WriteEntireTextFile("qa_data/tokens/office365.json", fileData: json.Emit(), charset: "utf-8", includePreamble: false)

}

 

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