/*-
 * ============LICENSE_START==========================================
 * ONAP Portal SDK
 * ===================================================================
 * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
 * ===================================================================
 *
 * Unless otherwise specified, all software contained herein is licensed
 * under the Apache License, Version 2.0 (the "License");
 * you may not use this software 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.
 *
 * Unless otherwise specified, all documentation contained herein is licensed
 * under the Creative Commons License, Attribution 4.0 Intl. (the "License");
 * you may not use this documentation except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *             https://creativecommons.org/licenses/by/4.0/
 *
 * Unless required by applicable law or agreed to in writing, documentation
 * 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.
 *
 * ============LICENSE_END============================================
 *
 * 
 */
package org.onap.portalsdk.external.authorization.util;

import java.io.IOException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.xml.bind.DatatypeConverter;

import org.onap.portalsdk.core.logging.logic.EELFLoggerDelegate;
import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;

import com.fasterxml.jackson.databind.ObjectMapper;

public class EcompExternalAuthUtils {

	private static final EELFLoggerDelegate logger = EELFLoggerDelegate.getLogger(EcompExternalAuthUtils.class);
	
	public static final String EXT_EMPTY_JSON_STRING = "{}";
	public static final String EXT_ROLE_FIELD = "role";
	public static final String EXT_PERM_FIELD = "perm";
	public static final String EXT_PERM_FIELD_TYPE = "type";
	public static final String EXT_PERM_ACCESS = ".access";
	public static final String EXT_ROLE_FIELD_NAME = "name";
	public static final String EXT_NULL_VALUE = "null";
	public static final String EXT_FIELD_DESCRIPTION = "description";
	public static final String EXT_FIELD_PERMS = "perms";
	public static final String EXT_ROLE_FIELD_OWNER = ".owner";
	public static final String EXT_ROLE_FIELD_ADMIN = ".admin";

	public static final Pattern VALID_USER_DOMAIN_ADDRESS_REGEX = 
		    Pattern.compile("^[A-Z0-9._%+-]+@[A-Z0-9.-]+\\.[A-Z]{2,6}$", Pattern.CASE_INSENSITIVE);
	
	public static HttpHeaders base64encodeKeyForAAFBasicAuth(String username, String password) throws Exception {
		String usernamePass = username + ":" + password;
		String encToBase64 = String.valueOf((DatatypeConverter.printBase64Binary(usernamePass.getBytes())));
		HttpHeaders headers = new HttpHeaders();
		headers.add("Authorization", "Basic " + encToBase64);
		headers.setContentType(MediaType.APPLICATION_JSON);
		return headers;
	}

	
	
	/**
	 * Validates, if given username has fully domain address
	 * @param String
	 * @return true or false
	 */
	public static boolean validate(String username) {
        Matcher matcher = VALID_USER_DOMAIN_ADDRESS_REGEX.matcher(username);
        return matcher.find();
	}
	
	/**
	 * 
	 * It checks whether the namespace is matching or not
	 * 
	 * @param permTypeVal
	 * @param appNamespaceVal
	 * @return true or false
	 */
	public static boolean checkNameSpaceMatching(String permTypeVal, String appNamespaceVal) {
		String[] typeNamespace = permTypeVal.split("\\.");
		String[] appNamespace = appNamespaceVal.split("\\.");
		boolean isNamespaceMatching = true;
		if (appNamespace.length <= typeNamespace.length) {
			for (int k = 0; k < appNamespace.length; k++) {
				if (!appNamespace[k].equals(typeNamespace[k]))
					isNamespaceMatching = false;
			}

		} else {
			isNamespaceMatching = false;
		}
		return isNamespaceMatching;
	}
	
	/**
	 * 
	 * It validates whether given string is JSON or not
	 * 
	 * @param jsonInString
	 * @return true or false
	 */
	  public static boolean isJSONValid(String jsonInString ) {
		    try {
		       final ObjectMapper mapper = new ObjectMapper();
		       mapper.readTree(jsonInString);
		       return true;
		    } catch (IOException e) {
		    	logger.error(EELFLoggerDelegate.errorLogger, "Failed to parse Json!", e);
		       return false;
		    }
		  }
}