(Ruby) Azure AD Service-to-service access token request

Send an Azure AD service-to-service token request to get an access token using a shared secret.

For more information, see https://docs.microsoft.com/en-us/azure/active-directory/develop/v1-oauth2-client-creds-grant-flow#service-to-service-access-token-request

Chilkat Ruby Downloads install from rubygems.org gem install chilkat or download... Ruby Library for Windows, MacOS, Linux, Alpine Linux

require 'chilkat'

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

http = Chilkat::CkHttp.new()

# To see the exact HTTP request sent and the response, set the SessionLogFilename property:
http.put_SessionLogFilename("qa_output/chilkatHttpLog.txt")

req = Chilkat::CkHttpRequest.new()

# Set the following request params:
# grant_type 	required 	Specifies the requested grant type. In a Client Credentials Grant flow, the value must be client_credentials.
# 
# client_id 	required 	Specifies the Azure AD client id of the calling web service. 
#     To find the calling application's client ID, in the Azure portal, click Azure Active Directory, click App registrations, click the application. 
#     The client_id is the Application ID
# 
# client_secret 	required 	Enter a key registered for the calling web service or daemon application in Azure AD. 
#     To create a key, in the Azure portal, click Azure Active Directory, click App registrations, click the application, click Settings, click Keys, and add a Key.
#     URL-encode this secret when providing it.
# 
# resource 	required 	Enter the App ID URI of the receiving web service. To find the App ID URI, in the Azure portal, click Azure Active Directory, 
#     click App registrations, click the service application, and then click Settings and Properties.

req.AddParam("grant_type","client_credentials")
req.AddParam("client_id","MY_CLIENT_ID")
req.AddParam("client_secret","MY_CLIENT_SECRET")
req.AddParam("resource","https://service.contoso.com/")

# The URL passed to PostUrlEncoded has this form:   https://login.microsoftonline.com/<tenant_id>/oauth2/token
# resp is a CkHttpResponse
resp = http.PostUrlEncoded("https://login.microsoftonline.com/<tenant_id>/oauth2/token",req)
if (http.get_LastMethodSuccess() == false)
    print http.lastErrorText() + "\n";
    exit
end

respStatusCode = resp.get_StatusCode()
print "Response Status Code = " + respStatusCode.to_s() + "\n";

json = Chilkat::CkJsonObject.new()
json.put_EmitCompact(false)
json.Load(resp.bodyStr())
print "Response JSON:" + "\n";
print json.emit() + "\n";

if (respStatusCode >= 400)
    print "Response Header:" + "\n";
    print resp.header() + "\n";
    print "Failed." + "\n";

    exit
end

# Sample response:

# {
#   "token_type": "Bearer",
#   "expires_in": "3599",
#   "ext_expires_in": "3599",
#   "expires_on": "1570059833",
#   "not_before": "1570055933",
#   "resource": "https://adminchilkatsoft.onmicrosoft.com/eb1b8ced-76b7-4845-aec5-d3e91776e345",
#   "access_token": "eyJ0eXAiO ... pmgw"
# }

# To get the items from the JSON....
token_type = json.stringOf("token_type")
expires_in = json.stringOf("expires_in")
ext_expires_in = json.stringOf("ext_expires_in")
expires_on = json.stringOf("expires_on")
not_before = json.stringOf("not_before")
resource = json.stringOf("resource")
access_token = json.stringOf("access_token")