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/*
 * Copyright 2015 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.springframework.social.security;

import java.io.Serializable;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

import org.springframework.security.authentication.AbstractAuthenticationToken;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.social.ServiceProvider;
import org.springframework.social.connect.Connection;
import org.springframework.social.connect.ConnectionData;
import org.springframework.util.Assert;

/**
 * Authentication token for social authentication, e.g. Twitter or Facebook
 * 
 * @author Stefan Fussennegger
 * @author Yuan Ji
 */
@SuppressWarnings("serial")
public class SocialAuthenticationToken extends AbstractAuthenticationToken {

	private final String providerId;

	private final Serializable principle;
	
	private final Connection connection;

	private final Map providerAccountData;

	/**
	 * @param connection connection data
	 * @param providerAccountData optional extra account data
	 */
	public SocialAuthenticationToken(final Connection connection, Map providerAccountData) {
		super(null);
		Assert.notNull(connection);
		ConnectionData connectionData = connection.createData();
		Assert.notNull(connectionData.getProviderId());
		if (connectionData.getExpireTime() != null && connectionData.getExpireTime() < System.currentTimeMillis()) {
			throw new IllegalArgumentException("connection.expireTime < currentTime");
		}
		this.providerId = connectionData.getProviderId();
		this.connection = connection;
		this.principle = null; //no principal yet
		if (providerAccountData != null) {
			this.providerAccountData = Collections.unmodifiableMap(new HashMap(providerAccountData));
		} else {
			this.providerAccountData = Collections.emptyMap();
		}
		super.setAuthenticated(false);
	}

	/**
	 * @param connection {@link Connection}
	 * @param details user details, typically as returned by {@link SocialUserDetailsService}
	 * @param providerAccountData optional extra account data
	 * @param authorities any {@link GrantedAuthority}s for this user
	 */
	public SocialAuthenticationToken(final Connection connection, final Serializable details, final Map providerAccountData, final Collection authorities) {
		super(authorities);
		Assert.notNull(connection);
        this.connection = connection;
        ConnectionData connectionData = connection.createData();
        Assert.notNull(connectionData.getProviderId());
        this.providerId = connectionData.getProviderId();
        if (details == null) {
			throw new NullPointerException("details");
		}
		this.principle = details;
		if (providerAccountData != null) {
			this.providerAccountData = Collections.unmodifiableMap(new HashMap(providerAccountData));
		} else {
			this.providerAccountData = Collections.emptyMap();
		}
		super.setAuthenticated(true);
	}

	/**
	 * @return {@link ServiceProvider} id
	 */
	public String getProviderId() {
		return providerId;
	}

	/**
	 * @return always null
	 */
	public Object getCredentials() {
		return null;
	}

	/**
	 * @return The user's principal. Null if not authenticated.
	 */
	public Serializable getPrincipal() {
		return principle;
	}

    public Connection getConnection(){
        return connection;
    }

    /**
	 * @return unmodifiable map, never null
	 */
	public Map getProviderAccountData() {
		return providerAccountData;
	}

	/**
	 * @throws IllegalArgumentException when trying to authenticate a previously unauthenticated token
	 */
	@Override
	public void setAuthenticated(final boolean isAuthenticated) throws IllegalArgumentException {
		if (!isAuthenticated) {
			super.setAuthenticated(false);
		} else if (!super.isAuthenticated()) {
			throw new IllegalArgumentException(
					"Cannot set this token to trusted - use constructor which takes a GrantedAuthority list instead");
		}
	}

}