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(VB.NET) Yahoo Mail OAuth2 Access Token for Desktop App
Demonstrates how to get a Yahoo Email OAuth2 access token from a desktop application or script.
This example requires a browser window to be displayed to allow the Yahoo account owner to authorize the access. The code for displaying the web browser is omitted. Suggestions for a few programming languages are provided in code comments. You'll need to add the code to display a web browser and navigate to the URL returned by the call to oauth2.StartAuth. For more information, see https://developer.yahoo.com/oauth2/guide/
' First, you must define your app in Yahoo Developer (https://developer.yahoo.com/apps/) like this:
' 
' This example requires the Chilkat API to have been previously unlocked.
' See Global Unlock Sample for sample code.
Dim oauth2 As New Chilkat.OAuth2
Dim success As Boolean
' For a desktop app, you must provide a script on your web server to redirect to "http://localhost/<portNumber>"
' It can be written in C#, PHP, or whatever desired. It must include the query string in the redirection.
' For example, in PHP your script would look like this:
' <?php
' header( 'Location: http://localhost:3017?' . $_SERVER['QUERY_STRING'] );
' ?>
oauth2.AppCallbackUrl = "https://yourwebserver.com/OAuth2.php"
oauth2.ListenPort = 3017
oauth2.AuthorizationEndpoint = "https://api.login.yahoo.com/oauth2/request_auth"
oauth2.TokenEndpoint = "https://api.login.yahoo.com/oauth2/get_token"
' Replace these with actual values.
oauth2.ClientId = "CLIENT_ID"
oauth2.ClientSecret = "CLIENT_SECRET"
' Do not send the "scope" query param for Yahoo OAuth2.
oauth2.UncommonOptions = "NO_OAUTH2_SCOPE"
' Begin the OAuth2 three-legged flow. This returns a URL that should be loaded in a browser.
Dim url As String = oauth2.StartAuth()
If (oauth2.LastMethodSuccess <> True) Then
Debug.WriteLine(oauth2.LastErrorText)
Exit Sub
End If
Debug.WriteLine(url)
' 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 Google 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...
' System.Diagnostics.Process.Start(url);
' Now wait for the authorization.
' We'll wait for a max of 30 seconds.
Dim numMsWaited As Integer = 0
While (numMsWaited < 30000) And (oauth2.AuthFlowState < 3)
oauth2.SleepMs(100)
numMsWaited = numMsWaited + 100
End While
' 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 < 3) Then
oauth2.Cancel()
Debug.WriteLine("No response from the browser!")
Exit Sub
End If
' 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 = 5) Then
Debug.WriteLine("OAuth2 failed to complete.")
Debug.WriteLine(oauth2.FailureInfo)
Exit Sub
End If
If (oauth2.AuthFlowState = 4) Then
Debug.WriteLine("OAuth2 authorization was denied.")
Debug.WriteLine(oauth2.AccessTokenResponse)
Exit Sub
End If
If (oauth2.AuthFlowState <> 3) Then
Debug.WriteLine("Unexpected AuthFlowState:" & oauth2.AuthFlowState)
Exit Sub
End If
' Save the full JSON access token response to a file.
Dim sbJson As New Chilkat.StringBuilder
sbJson.Append(oauth2.AccessTokenResponse)
sbJson.WriteFile("qa_data/tokens/yahooMail.json","utf-8",False)
' The saved JSON response looks like this:
' {
' "access_token": "kCVQdnOdul...LHucA--",
' "refresh_token": "AIenVXETSo0jklFBVkPS8vVm8E.Ej9ToRG.xDbDYmZ65WIs5t6CZhDrD",
' "expires_in": 3600,
' "token_type": "bearer",
' "xoauth_yahoo_guid": "HGDQCVF5JB4YDOWHITQJFBHCWA"
' }
Debug.WriteLine("OAuth2 authorization granted!")
Debug.WriteLine("Access Token: " & oauth2.AccessToken)
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