(PowerShell) Yahoo Mail Refresh OAuth2 Access Token

See more Yahoo Mail Examples

Demonstrates how to refresh an OAuth2 Yahoo Mail access token.

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

Chilkat .NET Downloads Chilkat .NET Assemblies

Add-Type -Path "C:\chilkat\ChilkatDotNet47-9.5.0-x64\ChilkatDotNet47.dll"

# 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

$jsonToken = New-Object Chilkat.JsonObject
$success = $jsonToken.LoadFile("qa_data/tokens/yahooMail.json")
if ($success -ne $true) {
    $("Failed to load googleSheets.json")
    exit
}

# 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"
# }

$oauth2 = New-Object 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 -ne $true) {
    $($oauth2.LastErrorText)
    exit
}

# 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.
$jsonToken.UpdateString("access_token",$oauth2.AccessToken)

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

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