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Java library for Javascript Object Signing and Encryption (JOSE) and JSON Web Tokens (JWT)
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package com.nimbusds.jose;


import java.text.ParseException;

import java.util.Collections;
import java.util.HashSet;
import java.util.Set;

import net.minidev.json.JSONObject;

import com.nimbusds.jose.util.Base64URL;
import com.nimbusds.jose.util.JSONObjectUtils;


/**
 * Plaintext JOSE header.
 *
 * Supports all {@link #getReservedParameterNames reserved header parameters}
 * of the plain specification:
 *
 * 

 *     alg (set to {@link Algorithm#NONE "none"}).
 *     
typ
 *     
cty
 * 
 *
 * The header may also carry {@link #setCustomParameters custom parameters};
 * these will be serialised and parsed along the reserved ones.
 *
 * 
Example:
 *
 * 
 * {
 *   "alg" : "none"
 * }
 * 
 *
 * @author Vladimir Dzhuvinov
 * @version $version$ (2013-01-08)
 */
public class PlainHeader extends Header implements ReadOnlyPlainHeader {


	/**
	 * The reserved parameter names.
	 */
	private static final Set RESERVED_PARAMETER_NAMES;
	
	
	/**
	 * Initialises the reserved parameter name set.
	 */
	static {
		Set p = new HashSet();
		
		p.add("alg");
		p.add("typ");
		p.add("cty");
		
		RESERVED_PARAMETER_NAMES = Collections.unmodifiableSet(p);
	}
	
	
	/**
	 * Creates a new plain header with algorithm 
	 * {@link Algorithm#NONE none}.
	 */
	public PlainHeader() {
	
		super(Algorithm.NONE);
	}
	
	
	/**
	 * Gets the reserved parameter names for plain headers.
	 *
	 * @return The reserved parameter names, as an unmodifiable set.
	 */
	public static Set getReservedParameterNames() {
	
		return RESERVED_PARAMETER_NAMES;
	}
	
	
	@Override
	public Algorithm getAlgorithm() {
	
		return alg;
	}
	
	
	/**
	 * @throws IllegalArgumentException If the specified parameter name
	 *                                  matches a reserved parameter name.
	 */
	@Override
	public void setCustomParameter(final String name, final Object value) {
	
		if (getReservedParameterNames().contains(name))
			throw new IllegalArgumentException("The parameter name \"" + name + "\" matches a reserved name");
		
		super.setCustomParameter(name, value);
	}
	
	
	@Override
	public Set getIncludedParameters() {
	
		Set includedParameters = 
			new HashSet(getCustomParameters().keySet());
		
		includedParameters.add("alg");
		
		if (getType() != null)
			includedParameters.add("typ");
			
		if (getContentType() != null)
			includedParameters.add("cty");
		
		return includedParameters;
	}
	
	
	/**
	 * Parses a plain header from the specified JSON object.
	 *
	 * @param json The JSON object to parse. Must not be {@code null}.
	 *
	 * @return The plain header.
	 *
	 * @throws ParseException If the specified JSON object doesn't represent
	 *                        a valid plain header.
	 */
	public static PlainHeader parse(final JSONObject json)
		throws ParseException {
		
		// Get the "alg" parameter
		Algorithm alg = Header.parseAlgorithm(json);
		
		if (alg != Algorithm.NONE)
			throw new ParseException("The algorithm \"alg\" header parameter must be \"none\"", 0);
			
		
		// Create a minimal header, type may be set later
		PlainHeader h = new PlainHeader();
		
		
		// Parse optional + custom parameters
		for(final String name: json.keySet()) {
				
			if (name.equals("alg"))
				continue; // skip
				
			else if (name.equals("typ"))
				h.setType(new JOSEObjectType(JSONObjectUtils.getString(json, name)));
				
			else if (name.equals("cty"))
				h.setContentType(JSONObjectUtils.getString(json, name));
				
			else
				h.setCustomParameter(name, json.get(name));
		}
		
		return h;
	}
	
	
	/**
	 * Parses a plain header from the specified JSON string.
	 *
	 * @param s The JSON string to parse. Must not be {@code null}.
	 *
	 * @return The plain header.
	 *
	 * @throws ParseException If the specified JSON string doesn't 
	 *                        represent a valid plain header.
	 */
	public static PlainHeader parse(final String s)
		throws ParseException {
		
		JSONObject jsonObject = JSONObjectUtils.parseJSONObject(s);
		
		return parse(jsonObject);
	}
	
	
	/**
	 * Parses a plain header from the specified Base64URL.
	 *
	 * @param base64URL The Base64URL to parse. Must not be {@code null}.
	 *
	 * @return The plain header.
	 *
	 * @throws ParseException If the specified Base64URL doesn't represent a
	 *                        valid plain header.
	 */
	public static PlainHeader parse(final Base64URL base64URL)
		throws ParseException {
		
		if (base64URL == null)
			throw new ParseException("The Base64URL must not be null", 0);
			
		return parse(base64URL.decodeToString());
	}
}