Azure AD authentication against azure functions using a custom app.

auhtenticateandquery.ps1

# getting a token from login.microsoft.com
# scope here is my custom app ID which has a custom application role defined.
$tenantID = "tenant.onmicrosoft.com"
$myCustomAPPID = "customAppWithID/.default"
$ClientID = 'your client id'
$ClientKey = 'your client key'
$params = @{
    scope         = $myCustomAPPID;
    grant_type    = 'client_credentials';
    client_id     = $ClientId;
    client_secret = $ClientKey;
}

$AADToken = Invoke-RestMethod -Method Post -Uri "https://login.microsoftonline.com/$tenantID/oauth2/v2.0/token" -Body $params

# Using the bearer token agains my azure functions uri
$functionsURI = "https://functionappurl.azurewebsites.net/api/HttpTrigger1?name=ehrnst"
$heacders = @{
    Authorization = 'Bearer ' + $AADToken.access_token
}
Invoke-RestMethod -Uri $functionsURI -Headers $heacders

https://adatum.no/?p=6514