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/*
 * Copyright (c) 2010-2012 Sonatype, Inc. All rights reserved.
 *
 * This program is licensed to you under the Apache License Version 2.0,
 * and you may not use this file except in compliance with the Apache License Version 2.0.
 * You may obtain a copy of the Apache License Version 2.0 at http://www.apache.org/licenses/LICENSE-2.0.
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the Apache License Version 2.0 is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Apache License Version 2.0 for the specific language governing permissions and limitations there under.
 */
package com.ning.http.util;

import static com.ning.http.util.AsyncHttpProviderUtils.getNonEmptyPath;
import static com.ning.http.util.MiscUtils.isNonEmpty;
import static java.nio.charset.StandardCharsets.ISO_8859_1;

import com.ning.http.client.ProxyServer;
import com.ning.http.client.Realm;
import com.ning.http.client.uri.Uri;

import java.nio.charset.Charset;

public final class AuthenticatorUtils {

    public static String computeBasicAuthentication(Realm realm) {
        return computeBasicAuthentication(realm.getPrincipal(), realm.getPassword(), realm.getCharset());
    }

    public static String computeBasicAuthentication(ProxyServer proxyServer) {
        return computeBasicAuthentication(proxyServer.getPrincipal(), proxyServer.getPassword(), proxyServer.getCharset());
    }

    private static String computeBasicAuthentication(String principal, String password, Charset charset) {
        String s = principal + ":" + password;
        return "Basic " + Base64.encode(s.getBytes(charset));
    }

    public static String computeRealmURI(Realm realm) {
        return computeRealmURI(realm.getUri(), realm.isUseAbsoluteURI(), realm.isOmitQuery());
    }
    
    public static String computeRealmURI(Uri uri, boolean useAbsoluteURI, boolean omitQuery) {
        if (useAbsoluteURI) {
            return omitQuery && MiscUtils.isNonEmpty(uri.getQuery()) ? uri.withNewQuery(null).toUrl() : uri.toUrl();
        } else {
            String path = getNonEmptyPath(uri);
            return omitQuery || !MiscUtils.isNonEmpty(uri.getQuery()) ? path : path + "?" + uri.getQuery();
        }
    }
    
    public static String computeDigestAuthentication(Realm realm) {

        StringBuilder builder = new StringBuilder().append("Digest ");
        append(builder, "username", realm.getPrincipal(), true);
        append(builder, "realm", realm.getRealmName(), true);
        append(builder, "nonce", realm.getNonce(), true);
        append(builder, "uri", computeRealmURI(realm), true);
        if (isNonEmpty(realm.getAlgorithm()))
            append(builder, "algorithm", realm.getAlgorithm(), false);

        append(builder, "response", realm.getResponse(), true);

        if (realm.getOpaque() != null)
            append(builder, "opaque", realm.getOpaque(), true);

        if (realm.getQop() != null) {
            append(builder, "qop", realm.getQop(), false);
            // nc and cnonce only sent if server sent qop
            append(builder, "nc", realm.getNc(), false);
            append(builder, "cnonce", realm.getCnonce(), true);
        }
        builder.setLength(builder.length() - 2); // remove tailing ", "

        // FIXME isn't there a more efficient way?
        return new String(StringUtils.charSequence2Bytes(builder, ISO_8859_1));
    }

    private static StringBuilder append(StringBuilder builder, String name, String value, boolean quoted) {
        builder.append(name).append('=');
        if (quoted)
            builder.append('"').append(value).append('"');
        else
            builder.append(value);

        return builder.append(", ");
    }
}