public Subject doAuthenticate()

in repository/service/src/main/java/org/apache/karaf/cave/repository/service/maven/MavenServlet.java [219:264]
46 lines of code
13 McCabe index (conditional complexity)

    public Subject doAuthenticate(final String username, final String password, final String role) {
        try {
            Subject subject = new Subject();
            LoginContext loginContext = new LoginContext(realm, subject, new CallbackHandler() {
                public void handle(Callback[] callbacks) throws IOException, UnsupportedCallbackException {
                    for (Callback callback : callbacks) {
                        if (callback instanceof NameCallback) {
                            ((NameCallback) callback).setName(username);
                        } else if (callback instanceof PasswordCallback) {
                            ((PasswordCallback) callback).setPassword(password.toCharArray());
                        } else {
                            throw new UnsupportedCallbackException(callback);
                        }
                    }
                }
            });
            loginContext.login();
            if (role != null && role.length() > 0) {
                String clazz = "org.apache.karaf.jaas.boot.principal.RolePrincipal";
                String name = role;
                int idx = role.indexOf(':');
                if (idx > 0) {
                    clazz = role.substring(0, idx);
                    name = role.substring(idx + 1);
                }
                boolean found = false;
                for (Principal p : subject.getPrincipals()) {
                    if (p.getClass().getName().equals(clazz)
                            && p.getName().equals(name)) {
                        found = true;
                        break;
                    }
                }
                if (!found) {
                    throw new FailedLoginException("User does not have the required role " + role);
                }
            }
            return subject;
        } catch (AccountException e) {
            LOGGER.warn("Account failure", e);
            return null;
        } catch (LoginException e) {
            LOGGER.debug("Login failed", e);
            return null;
        }
    }