package org.eclipse.aether.transport.http;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 */

import java.util.Arrays;
import java.util.Objects;

import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.SSLContext;

import org.eclipse.aether.RepositorySystemSession;
import org.eclipse.aether.repository.AuthenticationContext;
import org.eclipse.aether.util.ConfigUtils;

/**
 * SSL-related configuration and cache key for connection pools (whose scheme registries are derived from this config).
 */
final class SslConfig
{

    private static final String CIPHER_SUITES = "https.cipherSuites";

    private static final String PROTOCOLS = "https.protocols";

    final SSLContext context;

    final HostnameVerifier verifier;

    final String[] cipherSuites;

    final String[] protocols;

    SslConfig( RepositorySystemSession session, AuthenticationContext authContext )
    {
        context =
            ( authContext != null ) ? authContext.get( AuthenticationContext.SSL_CONTEXT, SSLContext.class ) : null;
        verifier =
            ( authContext != null ) ? authContext.get( AuthenticationContext.SSL_HOSTNAME_VERIFIER,
                                                       HostnameVerifier.class ) : null;

        cipherSuites = split( get( session, CIPHER_SUITES ) );
        protocols = split( get( session, PROTOCOLS ) );
    }

    private static String get( RepositorySystemSession session, String key )
    {
        String value = ConfigUtils.getString( session, null, "aether.connector." + key, key );
        if ( value == null )
        {
            value = System.getProperty( key );
        }
        return value;
    }

    private static String[] split( String value )
    {
        if ( value == null || value.isEmpty() )
        {
            return null;
        }
        return value.split( ",+" );
    }

    @Override
    public boolean equals( Object obj )
    {
        if ( this == obj )
        {
            return true;
        }
        if ( obj == null || !getClass().equals( obj.getClass() ) )
        {
            return false;
        }
        SslConfig that = (SslConfig) obj;
        return Objects.equals( context, that.context )
                && Objects.equals( verifier, that.verifier )
                && Arrays.equals( cipherSuites, that.cipherSuites )
                && Arrays.equals( protocols, that.protocols );
    }

    @Override
    public int hashCode()
    {
        int hash = 17;
        hash = hash * 31 + hash( context );
        hash = hash * 31 + hash( verifier );
        hash = hash * 31 + Arrays.hashCode( cipherSuites );
        hash = hash * 31 + Arrays.hashCode( protocols );
        return hash;
    }

    private static int hash( Object obj )
    {
        return obj != null ? obj.hashCode() : 0;
    }

}
