(Xojo Plugin) Yahoo Mail Refresh OAuth2 Access Token

See more Yahoo Mail Examples

For more information, see https://developer.yahoo.com/oauth2/guide/

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

// It is assumed we previously obtained an OAuth2 access token.
// This example loads the JSON access token file 
// saved by this example: Get Yahoo Mail OAuth2 Access Token

Dim jsonToken As New Chilkat.JsonObject
Dim success As Boolean
success = jsonToken.LoadFile("qa_data/tokens/yahooMail.json")
If (success <> True) Then
    System.DebugLog("Failed to load googleSheets.json")
    Return
End If

// The access token JSON looks like this:

// {
//   "access_token": "kCVQdnOdul...LHucA--",
//   "refresh_token": "AIenVWETSo0jklFBVkPS8vVm8E.Dj9ToRG.xDbDYmZ55WIs5t6CZhDkD",
//   "expires_in": 3600,
//   "token_type": "bearer",
//   "xoauth_yahoo_guid": "HGDQCVF6JB4YDOWHITPJFBHCWA"
// }

Dim oauth2 As New Chilkat.OAuth2

// See Step 5 at https://developer.yahoo.com/oauth2/guide/flows_authcode/
oauth2.TokenEndpoint = "https://api.login.yahoo.com/oauth2/get_token"

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

// Get the "refresh_token"
oauth2.RefreshToken = jsonToken.StringOf("refresh_token")

// Send the HTTP POST to refresh the access token..
success = oauth2.RefreshAccessToken()
If (success <> True) Then
    System.DebugLog(oauth2.LastErrorText)
    Return
End If

// The response contains a new access token, but we must keep
// our existing refresh token for when we need to refresh again in the future.
success = jsonToken.UpdateString("access_token",oauth2.AccessToken)

// Save the new JSON access token response to a file.
Dim sbJson As New Chilkat.StringBuilder
jsonToken.EmitCompact = False
success = jsonToken.EmitSb(sbJson)
success = sbJson.WriteFile("qa_data/tokens/yahooMail.json","utf-8",False)

System.DebugLog("OAuth2 authorization granted!")
System.DebugLog("New Access Token = " + oauth2.AccessToken)