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/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [http://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see .
 */
package org.neo4j.server.rest.dbms;

import java.security.Principal;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;

import org.neo4j.internal.kernel.api.connectioninfo.ClientConnectionInfo;
import org.neo4j.internal.kernel.api.security.AbstractSecurityLog;
import org.neo4j.internal.kernel.api.security.AccessMode;
import org.neo4j.internal.kernel.api.security.AuthSubject;
import org.neo4j.internal.kernel.api.security.LoginContext;
import org.neo4j.internal.kernel.api.security.SecurityContext;
import org.neo4j.server.rest.web.HttpConnectionInfoFactory;

public class AuthorizedRequestWrapper extends HttpServletRequestWrapper
{
    public static LoginContext getLoginContextFromHttpServletRequest( HttpServletRequest request )
    {
        Principal principal = request.getUserPrincipal();
        ClientConnectionInfo connectionInfo = HttpConnectionInfoFactory.create( request );
        return getLoginContextFromUserPrincipal( principal, connectionInfo );
    }

    public static LoginContext getLoginContextFromUserPrincipal( Principal principal, ClientConnectionInfo connectionInfo )
    {
        if ( principal instanceof DelegatingPrincipal )
        {
            return ((DelegatingPrincipal) principal).getLoginContext();
        }
        // If whitelisted uris can start transactions we cannot throw exception here
        //throw new IllegalArgumentException( "Tried to get access mode on illegal user principal" );
        return new LoginContext( AuthSubject.ANONYMOUS, connectionInfo )
        {
            @Override
            public SecurityContext authorize( IdLookup idLookup, String dbName, AbstractSecurityLog securityLog )
            {
                return new SecurityContext( subject(), AccessMode.Static.ACCESS, connectionInfo(), dbName );
            }
        };
    }

    private final String authType;
    private final DelegatingPrincipal principal;

    public AuthorizedRequestWrapper( final String authType, final String username, final HttpServletRequest request,
            LoginContext loginContext )
    {
        super( request );
        this.authType = authType;
        this.principal = new DelegatingPrincipal( username, loginContext );
    }

    @Override
    public String getAuthType()
    {
        return authType;
    }

    @Override
    public Principal getUserPrincipal()
    {
        return principal;
    }

    @Override
    public boolean isUserInRole( String role )
    {
        return true;
    }

    @Override
    public String toString()
    {
        return "AuthorizedRequestWrapper{" +
               "authType='" + authType + '\'' +
               ", principal=" + principal +
               '}';
    }

    @Override
    public boolean equals( Object o )
    {
        if ( this == o )
        {
            return true;
        }
        if ( o == null || getClass() != o.getClass() )
        {
            return false;
        }

        AuthorizedRequestWrapper that = (AuthorizedRequestWrapper) o;
        if ( !authType.equals( that.authType ) )
        {
            return false;
        }
        return principal.equals( that.principal );
    }

    @Override
    public int hashCode()
    {
        int result = authType.hashCode();
        result = 31 * result + principal.hashCode();
        return result;
    }
}