org.springframework.security.oauth.common.OAuthCodec.java Source code

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Here is the source code for org.springframework.security.oauth.common.OAuthCodec.java

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/*
 * Copyright 2008 Web Cohesion
 *
 * Licensed 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.
 */

package org.springframework.security.oauth.common;

import org.apache.commons.codec.DecoderException;
import org.apache.commons.codec.net.URLCodec;

import java.io.UnsupportedEncodingException;
import java.util.BitSet;

/**
 * Utility for parameter encoding according to the OAuth spec.
 *
 * @author Ryan Heaton
 */
public class OAuthCodec extends URLCodec {

    protected static final BitSet SAFE_CHARACTERS = (BitSet) URLCodec.WWW_FORM_URL.clone();
    static {
        //The OAuth codec defines different safe characters than the standard URL codec.
        SAFE_CHARACTERS.clear('*');
        SAFE_CHARACTERS.clear(' ');
        SAFE_CHARACTERS.set('~');
    }

    /**
     * Private constructor (instance methods not accessible).
     */
    private OAuthCodec() {
    }

    /**
     * Encode the specified value.
     *
     * @param value The value to encode.
     * @return The encoded value.
     */
    public static String oauthEncode(String value) {
        if (value == null) {
            return "";
        }

        try {
            return new String(URLCodec.encodeUrl(SAFE_CHARACTERS, value.getBytes("UTF-8")), "US-ASCII");
        } catch (UnsupportedEncodingException e) {
            throw new RuntimeException(e);
        }
    }

    /**
     * Decode the specified value.
     *
     * @param value The value to decode.
     * @return The decoded value.
     */
    public static String oauthDecode(String value) throws DecoderException {
        if (value == null) {
            return "";
        }

        try {
            return new String(URLCodec.decodeUrl(value.getBytes("US-ASCII")), "UTF-8");
        } catch (UnsupportedEncodingException e) {
            throw new RuntimeException(e);
        }
    }

}