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Azure AD OAuth User Token for Graph API
# Azure AD OAuth User Token for Graph API
# Get OAuth token for a AAD User (returned as $token)
# Add required assemblies
Add-Type -AssemblyName System.Web, PresentationFramework, PresentationCore
# Application (client) ID, tenant ID and redirect URI
$clientId = "<client id>"
$tenantId = "<tenant id>"
$redirectUri = "https://login.microsoftonline.com/common/oauth2/nativeclient"
# Scope - Needs to include all permisions required separated with a space
$scope = "User.Read.All Group.Read.All" # This is just an example set of permissions
# Random State - state is included in response, if you want to verify response is valid
$state = Get-Random
# Encode scope to fit inside query string
$scopeEncoded = [System.Web.HttpUtility]::UrlEncode($scope)
# Redirect URI (encode it to fit inside query string)
$redirectUriEncoded = [System.Web.HttpUtility]::UrlEncode($redirectUri)
# Construct URI
$uri = "https://login.microsoftonline.com/$tenantId/oauth2/v2.0/authorize?client_id=$clientId&response_type=code&redirect_uri=$redirectUriEncoded&response_mode=query&scope=$scopeEncoded&state=$state"
# Create Window for User Sign-In
$windowProperty = @{
Width = 500
Height = 700
}
$signInWindow = New-Object System.Windows.Window -Property $windowProperty
# Create WebBrowser for Window
$browserProperty = @{
Width = 480
Height = 680
}
$signInBrowser = New-Object System.Windows.Controls.WebBrowser -Property $browserProperty
# Navigate Browser to sign-in page
$signInBrowser.navigate($uri)
# Create a condition to check after each page load
$pageLoaded = {
# Once a URL contains "code=*", close the Window
if ($signInBrowser.Source -match "code=[^&]*") {
# With the form closed and complete with the code, parse the query string
$urlQueryString = [System.Uri]($signInBrowser.Source).Query
$script:urlQueryValues = [System.Web.HttpUtility]::ParseQueryString($urlQueryString)
$signInWindow.Close()
}
}
# Add condition to document completed
$signInBrowser.Add_LoadCompleted($pageLoaded)
# Show Window
$signInWindow.AddChild($signInBrowser)
$signInWindow.ShowDialog()
# Extract code from query string
$authCode = $script:urlQueryValues.GetValues(($script:urlQueryValues.keys | Where-Object { $_ -eq "code" }))
if ($authCode) {
# With Auth Code, start getting token
# Construct URI
$uri = "https://login.microsoftonline.com/$tenantId/oauth2/v2.0/token"
# Construct Body
$body = @{
client_id = $clientId
scope = $scope
code = $authCode[0]
redirect_uri = $redirectUri
grant_type = "authorization_code"
}
# Get OAuth 2.0 Token
$tokenRequest = Invoke-WebRequest -Method Post -Uri $uri -ContentType "application/x-www-form-urlencoded" -Body $body
# Access Token
$token = ($tokenRequest.Content | ConvertFrom-Json).access_token
}
else {
Write-Error "Unable to obtain Auth Code!"
}
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