How to call Microsoft Graph REST API with groovy-wslite - rest

Question

I am trying to call Microsoft Graph API on groovy script using Java libraries. However, even though partly success, I still have some serious issues using it within my current project, so I think about trying to call the the REST API using groovy-wslite.
This is my current code for getting access token:
def authorizeHost = "https://login.microsoftonline.com"
def authorizePath = "/${azureSetting.getTenantID()}/oauth2/v2.0/authorize?"
try {
RESTClient client = new RESTClient(authorizeHost)
def params = [
"client_id":azureSetting.getClientID(),
"scope": "https://graph.microsoft.com/.default",
"response_type": "code"
]
def response = client.post(
path: authorizePath,
)
{
type ContentType.JSON
json params
}
LOGGER.info("Success: " + (response.statusCode == 200));
LOGGER.info("Output: (" + response.contentType + ") " + response.text);
} catch (RESTClientException e) {
StringWriter sw = new StringWriter();
e.printStackTrace(new PrintWriter(sw));
LOGGER.info("Error: " + sw.toString());
}
The response from the log:
AADSTS900144: The request body must contain the following parameter: 'client_id'.
How can I change the above code, so that Microsoft Graph REST API can recognize my sending content and send back the access token.
UPDATE: After trying around, I found out that the body os post method should be as below:
type "application/x-www-form-urlencoded"
urlenc client_id: azureSetting.getClientID(),
scope: "https://graph.microsoft.com/.default",
response_type: "code"

Answer 1

according to doc https://learn.microsoft.com/en-us/graph/auth-v2-user#token-request your request should have Content-Type: application/x-www-form-urlencoded
you are trying to send json instead
here is your code but pointing to a test httpbin.org server and it could show what exactly you are sending to server
there is a minor change: ContentType.JSON -> ContentType.URLENC
#Grab(group='com.github.groovy-wslite', module='groovy-wslite', version='1.1.3', transitive=false)
import wslite.rest.*
//just for test
def azureSetting = [ getClientID:{-> "12345"} ]
def LOGGER = [info:{x-> println x}]
//redefined host and url
def authorizeHost = "HTTP://httpbin.org"
def authorizePath = "/post"
try {
RESTClient client = new RESTClient(authorizeHost)
def params = [
"client_id":azureSetting.getClientID(),
"scope": "https://graph.microsoft.com/.default",
"response_type": "code"
]
def response = client.post(
path: authorizePath,
)
{
type ContentType.URLENC // <-- THE ONLY CHANGE IN YOUR CODE
json params
}
LOGGER.info("Success: " + (response.statusCode == 200));
LOGGER.info("Output: (" + response.contentType + ") " + response.text);
} catch (RESTClientException e) {
StringWriter sw = new StringWriter();
e.printStackTrace(new PrintWriter(sw));
LOGGER.info("Error: " + sw.toString());
}