Add OAUTH2 OIDC login support (#1140)

* Somewhat working

* Change Autocreate logic

* Add OAuth Error Message if Auto create Disabled

* Display OAUTH2 username(email) in Account Settings

* Disable Change user/pass for Oauth2 user

* Hide SSO Button if SSO login Disabled

* Remove some spaces and comments

* Add OAUTH2 Login example docker-compose file

* Add Some Comments

* Hide Printing of Client secret

* Remove OAUTH2 Beans

and replace with applicationProperties

* Add conditional annotation to Bean Creation

* Update settings.yml.template

Add OAUTH2 enabling template.

* Update messages_en_GB.properties

src/main/java/stirling/software/SPDF/config/security/UserService.java

@@ -30,6 +30,24 @@ public class UserService implements UserServiceInterface {
 
     @Autowired private PasswordEncoder passwordEncoder;
 
+    // Handle OAUTH2 login and user auto creation.
+    public boolean processOAuth2PostLogin(String username, boolean autoCreateUser) {
+        Optional<User> existUser = userRepository.findByUsernameIgnoreCase(username);
+        if (existUser.isPresent()) {
+            return true;
+        }
+        if (autoCreateUser) {
+            User user = new User();
+            user.setUsername(username);
+            user.setEnabled(true);
+            user.setFirstLogin(false);
+            user.addAuthority(new Authority( Role.USER.getRoleId(), user));
+            userRepository.save(user);
+            return true;
+        }
+        return false;
+    }
+
     public Authentication getAuthentication(String apiKey) {
         User user = getUserByApiKey(apiKey);
         if (user == null) {