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package test;
import com.microsoft.aad.msal4j.ClientCredentialFactory;
import com.microsoft.aad.msal4j.ClientCredentialParameters;
import com.microsoft.aad.msal4j.ConfidentialClientApplication;
import com.microsoft.aad.msal4j.IAuthenticationResult;
import com.nimbusds.oauth2.sdk.http.HTTPResponse;
 
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Base64;
import java.util.Collections;
import java.util.Properties;
import java.util.concurrent.CompletableFuture;
 
import javax.mail.MessagingException;
import javax.mail.NoSuchProviderException;
import javax.mail.Session;
import javax.mail.Store;
 
class ClientCredentialGrantAndConnect {
 
    private static String authority;
    private static String clientId;
    private static String secret;
    private static String scope;
    private static ConfidentialClientApplication app;
 
    public static void main(String args[]) throws Exception{
 
        setUpSampleData();
 
        try {
        	BuildConfidentialClientObject();
            IAuthenticationResult result = getAccessTokenByClientCredentialGrant();
            String usersListFromGraph = getUsersListFromGraph(result.accessToken());
            System.out.println("\nAccessToken: "+result.accessToken());
 
            System.out.println("Users in the Tenant = " + usersListFromGraph);
 
 
            // imap
            connectIMAP("ManishPrajapati@SampleOrg2022.onmicrosoft.com",result.accessToken());
 
            doSleep(2000);	//  wait for 2 seconds before proceeding...
 
            // POP3
            connectPOP("ManishPrajapati@SampleOrg2022.onmicrosoft.com", result.accessToken());
 
 
            // Wait for program Exit !
            doSleep(2000);
            System.out.println("Press any key to exit ...");
            System.in.read();
 
        } catch(Exception ex){
            System.out.println("Oops! We have an exception of type - " + ex.getClass());
            System.out.println("Exception message - " + ex.getMessage());
            throw ex;
        }
    }
 
    private static void BuildConfidentialClientObject() throws Exception {
 
    	// Load properties file and set properties used throughout the sample
    	app = ConfidentialClientApplication.builder(
                clientId,
                ClientCredentialFactory.createFromSecret(secret))
                .authority(authority)
                .build();		        
    }
 
 
    // SCOPE is always https://o...content-available-to-author-only...e.com/.default
    private static IAuthenticationResult getAccessTokenByClientCredentialGrant() throws Exception {
 
    	// With client credentials flows the scope is ALWAYS of the shape "resource/.default", as the
        // application permissions need to be set statically (in the portal), and then granted by a tenant administrator
        ClientCredentialParameters clientCredentialParam = ClientCredentialParameters.builder(
                Collections.singleton(scope))
                .build();
 
        CompletableFuture<IAuthenticationResult> future = app.acquireToken(clientCredentialParam);
        return future.get();
    }
 
 
    // try running an API call using currently generated access token
    private static String getUsersListFromGraph(String accessToken) throws IOException {
        URL url = new URL("https://graph.microsoft.com/v1.0/users");
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
 
        conn.setRequestMethod("GET");
        conn.setRequestProperty("Authorization", "Bearer " + accessToken);
        conn.setRequestProperty("Accept","application/json");
 
        int httpResponseCode = conn.getResponseCode();
        if(httpResponseCode == HTTPResponse.SC_OK) {
 
            StringBuilder response;
            try(BufferedReader in = new BufferedReader(
                    new InputStreamReader(conn.getInputStream()))){
 
                String inputLine;
                response = new StringBuilder();
                while (( inputLine = in.readLine()) != null) {
                    response.append(inputLine);
                }
            }
            return response.toString();
        } else {
            return String.format("Connection returned HTTP code: %s with message: %s",
                    httpResponseCode, conn.getResponseMessage());
        }
    }
 
    /**
     * Helper function unique to this sample setting. In a real application these wouldn't be so hardcoded, for example
     * different users may need different authority endpoints or scopes
     */
    private static void setUpSampleData() throws IOException {
        // Load properties file and set properties used throughout the sample
        Properties properties = new Properties();
        properties.load(Thread.currentThread().getContextClassLoader().getResourceAsStream("application.properties"));
 
        authority = properties.getProperty("AUTHORITY");
        clientId = properties.getProperty("CLIENT_ID");
        secret = properties.getProperty("SECRET");
        scope = properties.getProperty("SCOPE");
    }
 
 
    // imap
    public static void connectIMAP(String userEmail, String accessToken){
		System.out.println("\n\n  *** IMAP *** \n");
 
		String SSL_FACTORY = "javax.net.ssl.SSLSocketFactory";
		Properties props= new Properties();
 
		props.put("mail.imap.ssl.enable", "true");
		props.put("mail.imap.sasl.enable", "true");
		props.put("mail.imap.port", "993");
 
		props.put("mail.imap.auth.mechanisms", "XOAUTH2");
		props.put("mail.imap.sasl.mechanisms", "XOAUTH2");
 
		props.put("mail.imap.auth.login.disable", "true");
		props.put("mail.imap.auth.plain.disable", "true");
 
		props.setProperty("mail.imap.socketFactory.class", SSL_FACTORY);
        props.setProperty("mail.imap.socketFactory.fallback", "false");
        props.setProperty("mail.imap.socketFactory.port", "993");
		props.setProperty("mail.imap.starttls.enable", "true");
 
		props.put("mail.debug", "true");
		props.put("mail.debug.auth", "true");
 
		Session session = Session.getInstance(props);
		session.setDebug(true);
 
 
		try {
			final Store store = session.getStore("imap");					
			store.connect("outlook.office365.com",userEmail, accessToken);	
 
			if(store.isConnected()){
				System.out.println("Connection Established using imap protocol successfully !");		
			}else{
				System.out.println("Connection didn't got establisted !");
			}
		} catch (NoSuchProviderException e) {	// session.getStore()
			e.printStackTrace();
		} catch (MessagingException e) {		// store.connect()
			e.printStackTrace();
		}
	}
 
 
    // POP3
    public static void connectPOP(String email, String accessToken){
		Properties properties= new Properties();
 
        properties.put("mail.pop3.port", "995");				
 
        properties.put("mail.pop3.ssl.enable", "false");
        properties.put("mail.pop3.starttls.enable", "true"); 
        properties.put("mail.pop3.starttls.required", "true");
 
        properties.put("mail.pop3.connectiontimeout", 5000);
        properties.put("mail.pop3.timeout", 5000);
        properties.put("mail.pop3.partialfetch", false);
        properties.put("mail.pop3.auth.mechanisms", "XOAUTH2");
 
        properties.put("mail.pop3.forgettopheaders", "true");	
        properties.put("mail.pop3.sasl.enable", "true");
        properties.put("mail.pop3.sasl.mechanisms", "XOAUTH2");		
        properties.put("mail.pop3.auth.login.disable", "true");
        properties.put("mail.pop3.auth.plain.disable", "true");
        properties.put("mail.pop3.auth.plain.disable", "true");
        properties.put("mail.debug", "true");
 
        Session session = Session.getInstance(properties);
        session.setDebug(true);
        try{
	        Store store = session.getStore("pop3");
	        store.connect("outlook.office365.com", email, accessToken);
 
	        if(store.isConnected()){
	        	System.out.println("Connected with POP3 successfully !");
	        }
        }catch(Exception e){
        	e.printStackTrace();
        }
	}
 
    public static void doSleep(int d){
    	int delay = d; // number of milliseconds to sleep
        long start = System.currentTimeMillis();
        while(start >= System.currentTimeMillis() - delay); // do nothing
    }
 
}
 

Main.java:2: error: package com.microsoft.aad.msal4j does not exist
import com.microsoft.aad.msal4j.ClientCredentialFactory;
                               ^
Main.java:3: error: package com.microsoft.aad.msal4j does not exist
import com.microsoft.aad.msal4j.ClientCredentialParameters;
                               ^
Main.java:4: error: package com.microsoft.aad.msal4j does not exist
import com.microsoft.aad.msal4j.ConfidentialClientApplication;
                               ^
Main.java:5: error: package com.microsoft.aad.msal4j does not exist
import com.microsoft.aad.msal4j.IAuthenticationResult;
                               ^
Main.java:6: error: package com.nimbusds.oauth2.sdk.http does not exist
import com.nimbusds.oauth2.sdk.http.HTTPResponse;
                                   ^
Main.java:18: error: package javax.mail does not exist
import javax.mail.MessagingException;
                 ^
Main.java:19: error: package javax.mail does not exist
import javax.mail.NoSuchProviderException;
                 ^
Main.java:20: error: package javax.mail does not exist
import javax.mail.Session;
                 ^
Main.java:21: error: package javax.mail does not exist
import javax.mail.Store;
                 ^
Main.java:29: error: cannot find symbol
    private static ConfidentialClientApplication app;
                   ^
  symbol:   class ConfidentialClientApplication
  location: class ClientCredentialGrantAndConnect
Main.java:77: error: cannot find symbol
    private static IAuthenticationResult getAccessTokenByClientCredentialGrant() throws Exception {
                   ^
  symbol:   class IAuthenticationResult
  location: class ClientCredentialGrantAndConnect
Main.java:37: error: cannot find symbol
            IAuthenticationResult result = getAccessTokenByClientCredentialGrant();
            ^
  symbol:   class IAuthenticationResult
  location: class ClientCredentialGrantAndConnect
Main.java:68: error: cannot find symbol
    	app = ConfidentialClientApplication.builder(
    	      ^
  symbol:   variable ConfidentialClientApplication
  location: class ClientCredentialGrantAndConnect
Main.java:70: error: cannot find symbol
                ClientCredentialFactory.createFromSecret(secret))
                ^
  symbol:   variable ClientCredentialFactory
  location: class ClientCredentialGrantAndConnect
Main.java:81: error: cannot find symbol
        ClientCredentialParameters clientCredentialParam = ClientCredentialParameters.builder(
        ^
  symbol:   class ClientCredentialParameters
  location: class ClientCredentialGrantAndConnect
Main.java:81: error: cannot find symbol
        ClientCredentialParameters clientCredentialParam = ClientCredentialParameters.builder(
                                                           ^
  symbol:   variable ClientCredentialParameters
  location: class ClientCredentialGrantAndConnect
Main.java:85: error: cannot find symbol
        CompletableFuture<IAuthenticationResult> future = app.acquireToken(clientCredentialParam);
                          ^
  symbol:   class IAuthenticationResult
  location: class ClientCredentialGrantAndConnect
Main.java:100: error: cannot find symbol
        if(httpResponseCode == HTTPResponse.SC_OK) {
                               ^
  symbol:   variable HTTPResponse
  location: class ClientCredentialGrantAndConnect
Main.java:160: error: cannot find symbol
		Session session = Session.getInstance(props);
		^
  symbol:   class Session
  location: class ClientCredentialGrantAndConnect
Main.java:160: error: cannot find symbol
		Session session = Session.getInstance(props);
		                  ^
  symbol:   variable Session
  location: class ClientCredentialGrantAndConnect
Main.java:165: error: cannot find symbol
			final Store store = session.getStore("imap");					
			      ^
  symbol:   class Store
  location: class ClientCredentialGrantAndConnect
Main.java:173: error: cannot find symbol
		} catch (NoSuchProviderException e) {	// session.getStore()
		         ^
  symbol:   class NoSuchProviderException
  location: class ClientCredentialGrantAndConnect
Main.java:175: error: cannot find symbol
		} catch (MessagingException e) {		// store.connect()
		         ^
  symbol:   class MessagingException
  location: class ClientCredentialGrantAndConnect
Main.java:204: error: cannot find symbol
        Session session = Session.getInstance(properties);
        ^
  symbol:   class Session
  location: class ClientCredentialGrantAndConnect
Main.java:204: error: cannot find symbol
        Session session = Session.getInstance(properties);
                          ^
  symbol:   variable Session
  location: class ClientCredentialGrantAndConnect
Main.java:207: error: cannot find symbol
	        Store store = session.getStore("pop3");
	        ^
  symbol:   class Store
  location: class ClientCredentialGrantAndConnect
26 errors

Standard output is empty