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/*
 * Copyright (c) 2015-2018, Virgil Security, Inc.
 *
 * Lead Maintainer: Virgil Security Inc. 
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *     (1) Redistributions of source code must retain the above copyright notice, this
 *     list of conditions and the following disclaimer.
 *
 *     (2) Redistributions in binary form must reproduce the above copyright notice,
 *     this list of conditions and the following disclaimer in the documentation
 *     and/or other materials provided with the distribution.
 *
 *     (3) Neither the name of virgil nor the names of its
 *     contributors may be used to endorse or promote products derived from
 *     this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package com.virgilsecurity.sdk.jwt;

import com.google.gson.annotations.SerializedName;
import com.virgilsecurity.sdk.common.TimeSpan;

import java.util.Date;
import java.util.Map;

/**
 * The {@link JwtBodyContent} represents contents of {@link Jwt} body.
 */
public class JwtBodyContent {

    private static final String ISSUER_PREFIX = "virgil-";
    private static final String SUBJECT_PREFIX = "identity-";

    @SerializedName("iss")
    private String issuer;

    @SerializedName("sub")
    private String subject;

    @SerializedName("ada")
    private Map additionalData;

    @SerializedName("exp")
    private long expiresAt;

    @SerializedName("iat")
    private long issuedAt;

    /**
     * Instantiates a new Jwt body content.
     *
     * @param appId
     *            the application identifier
     * @param identity
     *            the identity
     * @param additionalData
     *            the additional data associated with token
     * @param expiresAt
     *            a lifetime of token
     * @param issuedAt
     *            when the token is issued at
     */
    public JwtBodyContent(String appId, String identity, Map additionalData, TimeSpan expiresAt,
            Date issuedAt) {
        this(appId, identity, expiresAt, issuedAt);

        this.additionalData = additionalData;
    }

    /**
     * Instantiates a new Jwt body content.
     *
     * @param appId
     *            the application identifier
     * @param identity
     *            the identity
     * @param expiresAt
     *            a lifetime of token
     * @param issuedAt
     *            when the token is issued at
     */
    public JwtBodyContent(String appId, String identity, TimeSpan expiresAt, Date issuedAt) {
        if (appId != null) {
            this.issuer = ISSUER_PREFIX + appId;
        }
        if (identity != null) {
            this.subject = SUBJECT_PREFIX + identity;
        }
        this.issuedAt = issuedAt.getTime() / 1000;
        this.expiresAt = this.issuedAt + expiresAt.getSpanSeconds();
    }

    /*
     * (non-Javadoc)
     * 
     * @see java.lang.Object#equals(java.lang.Object)
     */
    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        JwtBodyContent other = (JwtBodyContent) obj;
        if (additionalData == null) {
            if (other.additionalData != null)
                return false;
        } else if (!additionalData.equals(other.additionalData))
            return false;
        if (expiresAt != other.expiresAt)
            return false;
        if (issuedAt != other.issuedAt)
            return false;
        if (issuer == null) {
            if (other.issuer != null)
                return false;
        } else if (!issuer.equals(other.issuer))
            return false;
        if (subject == null) {
            if (other.subject != null)
                return false;
        } else if (!subject.equals(other.subject))
            return false;
        return true;
    }

    /**
     * Gets additional data.
     *
     * @return the additional data
     */
    public Map getAdditionalData() {
        return additionalData;
    }

    /**
     * Gets application identifier.
     *
     * @return the application identifier
     */
    public String getAppId() {
        if (issuer == null) {
            return null;
        }
        return issuer.substring(ISSUER_PREFIX.length());
    }

    /**
     * Gets expires at - the lifetime of token.
     *
     * @return the expires at - the lifetime of token (Unix Timestamp)
     */
    public long getExpiresAt() {
        return expiresAt;
    }

    /**
     * Gets identity.
     *
     * @return the identity
     */
    public String getIdentity() {
        if (subject == null) {
            return null;
        }
        return subject.substring(SUBJECT_PREFIX.length());
    }

    /**
     * Gets issued at.
     *
     * @return the issued at
     */
    public Date getIssuedAt() {
        return new Date(issuedAt * 1000);
    }

    /**
     * @return the issuer
     */
    public String getIssuer() {
        return issuer;
    }

    /**
     * @return the subject
     */
    public String getSubject() {
        return subject;
    }

    /*
     * (non-Javadoc)
     * 
     * @see java.lang.Object#hashCode()
     */
    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((additionalData == null) ? 0 : additionalData.hashCode());
        result = prime * result + (int) (expiresAt ^ (expiresAt >>> 32));
        result = prime * result + (int) (issuedAt ^ (issuedAt >>> 32));
        result = prime * result + ((issuer == null) ? 0 : issuer.hashCode());
        result = prime * result + ((subject == null) ? 0 : subject.hashCode());
        return result;
    }

}