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package com.textrecruit.ustackserverapi.auth;

import java.util.*;

import com.mongodb.DBObject;
import com.textrecruit.ustackserverapi.params.ParamNames;
import com.textrecruit.ustackserverapi.params.types.ParameterDefinitionInt;
import com.textrecruit.ustack.data.APIClient;
import org.apache.log4j.Logger;
import org.jboss.netty.handler.codec.http.HttpRequest;

import com.textrecruit.ustack.data.UserAccount;
import com.textrecruit.ustackserverapi.APIException;
import com.textrecruit.ustackserverapi.CallParameters;
import com.textrecruit.ustackserverapi.MethodDefinition;

/**
 * Authentication method for client key with a provided username
 * 
 * @author jdanner
 *
 */
public class APIClientKeyUserAuth implements AuthenticationInt {

    static Logger           		logger               	= Logger.getLogger(APIClientKeyUserAuth.class);
 
    public static final String CookieTokenName = "UNTZ";
    
    public String getAuthenticationDescription() {
    	return "Authentication via an API Client and API Key. An authentication access token may also be used.";
    }

    public boolean isBasicAuth() {
    	return false;
    }

    /**
     * 
     */
    public List> getAuthenticationParameters() {
    	
    	List> ret = new ArrayList>();
    	ret.add(ParamNames.client_id);
    	ret.add(ParamNames.api_key);
    	return ret;
    }
    
	@Override
	public UserAccount authenticate(MethodDefinition method, HttpRequest req, CallParameters params) throws APIException {

		String userName = null;
		if ( params.get(ParamNames.token) != null)
		{
			AccessTokenAuth auth = new AccessTokenAuth();
			return auth.authenticate(method, req, params);
//			//AuthTypes.ClientKey.authenticate(method, req, params);
//			AccessTokenDetails details = AccessToken.decode( params.get(ParamNames.token) );
//
//			if (details == null)
//			{
//				logger.warn(String.format("Invalid Token => '%s'", params.get(ParamNames.token)));
//				throw new APIAuthenticationException("Invalid Token");
//			}
//
//			LogoutUtil.checkTokenLogout(details);
//
//			long tokenLife = details.getExpirationAge() - System.currentTimeMillis();
//			if (tokenLife < 0)
//			{
//				logger.info(String.format("%s -- %s/%s | Access Token expired at '%s'", method.getPath(), details.getUserName(), details.getClientId(), new SimpleDateFormat("MM/dd/yyyy h:mm:ss a").format(new Date(details.getExpirationAge()))));
//				throw new APIAuthenticationException("Token has expired");
//			}
//
//	//		logger.info(String.format("%s -> Expiration %d -> Now: %d", details.userName, details.expirationAge, System.currentTimeMillis()));
//
//			params.setParameterValue(ParamNames.client_id.getName(), details.getClientId());
//			params.setTokenTTL(tokenLife);
//
//			userName = details.getUserName();
		}
		else if (params.get(ParamNames.client_id) != null) {
			/*
			 * Make sure that the ApiClient record has a resourceLink with a customerId that the given username also has.
			 * Don't trust the username here.
			 */

			ClientKeyAuthBase.authenticate(method, req, params);

			// Get set of API Client's customer IDs.
			APIClient acct = APIClient.getAPIClient(params.get(ParamNames.client_id));
			if (acct == null) {
				throw new APIAuthenticationException("Could not find API client");
			}
			if (acct.getResourceLinkList().isEmpty()) {
				throw new APIAuthenticationException("API client's resource list is empty.");
			}
			Set apiClientCustomerIds = new HashSet();
			for (Object apiClientResourceLinkObj : acct.getResourceLinkList()) {
				apiClientCustomerIds.add((String) ((DBObject)apiClientResourceLinkObj).get("customerId"));
			}

			// Fetch user object.
			userName = params.get(ParamNames.username);
			UserAccount user = UserAccount.getUser(userName);
			if (user == null) {
				// If there's no user, we will support the previous behavior and return null.
				return null;
			}

			// Make sure a common customer ID exists between API Client and User.
			boolean commonCustomerIdsExist = false;
			for (Object userResourceLinkObj : user.getResourceLinkList()) {
				if (apiClientCustomerIds.contains((String)((DBObject)userResourceLinkObj).get("customerId"))) {
					commonCustomerIdsExist = true;
				}
			}
			if (!commonCustomerIdsExist) {
				throw new APIAuthenticationException("API does not have access to given username");
			}
		}
		else
			throw new APIAuthenticationException("Authentication Parameters Not Provided");
			
		return UserAccount.getUser(userName);
	}

}