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package org.scribe.utils;
import java.io.*;
import java.net.*;
import java.util.*;
/**
* Utils to deal with URL and url-encodings
*
* @author Pablo Fernandez
*/
public class URLUtils
{
private static final String EMPTY_STRING = "";
private static final String UTF_8 = "UTF-8";
private static final String PAIR_SEPARATOR = "=";
private static final String PARAM_SEPARATOR = "&";
private static final char QUERY_STRING_SEPARATOR = '?';
private static final String ERROR_MSG = String.format("Cannot find specified encoding: %s", UTF_8);
private static final Set<EncodingRule> ENCODING_RULES;
static
{
Set<EncodingRule> rules = new HashSet<EncodingRule>();
rules.add(new EncodingRule("*","%2A"));
rules.add(new EncodingRule("+","%20"));
rules.add(new EncodingRule("%7E", "~"));
ENCODING_RULES = Collections.unmodifiableSet(rules);
}
/**
* Turns a map into a form-urlencoded string
*
* @param map any map
* @return form-url-encoded string
*/
public static String formURLEncodeMap(Map<String, String> map)
{
Preconditions.checkNotNull(map, "Cannot url-encode a null object");
return (map.size() <= 0) ? EMPTY_STRING : doFormUrlEncode(map);
}
private static String doFormUrlEncode(Map<String, String> map)
{
StringBuffer encodedString = new StringBuffer(map.size() * 20);
for (String key : map.keySet())
{
encodedString.append(PARAM_SEPARATOR).append(formURLEncode(key));
if(map.get(key) != null)
{
encodedString.append(PAIR_SEPARATOR).append(formURLEncode(map.get(key)));
}
}
return encodedString.toString().substring(1);
}
/**
* Percent encodes a string
*
* @param string plain string
* @return percent encoded string
*/
public static String percentEncode(String string)
{
String encoded = formURLEncode(string);
for (EncodingRule rule : ENCODING_RULES)
{
encoded = rule.apply(encoded);
}
return encoded;
}
/**
* Translates a string into application/x-www-form-urlencoded format
*
* @param plain
* @return form-urlencoded string
*/
public static String formURLEncode(String string)
{
Preconditions.checkNotNull(string, "Cannot encode null string");
try
{
return URLEncoder.encode(string, UTF_8);
}
catch (UnsupportedEncodingException uee)
{
throw new IllegalStateException(ERROR_MSG, uee);
}
}
/**
* Decodes a application/x-www-form-urlencoded string
*
* @param string form-urlencoded string
* @return plain string
*/
public static String formURLDecode(String string)
{
Preconditions.checkNotNull(string, "Cannot decode null string");
try
{
return URLDecoder.decode(string, UTF_8);
}
catch (UnsupportedEncodingException uee)
{
throw new IllegalStateException(ERROR_MSG, uee);
}
}
/**
* Append given parameters to the query string of the url
*
* @param url the url to append parameters to
* @param params any map
* @return new url with parameters on query string
*/
public static String appendParametersToQueryString(String url, Map<String, String> params)
{
Preconditions.checkNotNull(url, "Cannot append to null URL");
String queryString = URLUtils.formURLEncodeMap(params);
if (queryString.equals(EMPTY_STRING))
{
return url;
}
else
{
url += url.indexOf(QUERY_STRING_SEPARATOR) != -1 ? PARAM_SEPARATOR : QUERY_STRING_SEPARATOR;
url += queryString;
return url;
}
}
/**
* Concats a key-value map into a querystring-like String
*
* @param params key-value map
* @return querystring-like String
*/
// TODO Move to MapUtils
public static String concatSortedPercentEncodedParams(Map<String, String> params)
{
StringBuilder result = new StringBuilder();
for (String key : params.keySet())
{
result.append(key).append(PAIR_SEPARATOR);
result.append(params.get(key)).append(PARAM_SEPARATOR);
}
return result.toString().substring(0, result.length() - 1);
}
/**
* Parses and form-urldecodes a querystring-like string into a map
*
* @param queryString querystring-like String
* @return a map with the form-urldecoded parameters
*/
// TODO Move to MapUtils
public static Map<String, String> queryStringToMap(String queryString)
{
Map<String, String> result = new HashMap<String, String>();
if (queryString != null && queryString.length() > 0)
{
for (String param : queryString.split(PARAM_SEPARATOR))
{
String pair[] = param.split(PAIR_SEPARATOR);
String key = formURLDecode(pair[0]);
String value = pair.length > 1 ? formURLDecode(pair[1]) : EMPTY_STRING;
result.put(key, value);
}
}
return result;
}
private static final class EncodingRule
{
private final String ch;
private final String toCh;
EncodingRule(String ch, String toCh)
{
this.ch = ch;
this.toCh = toCh;
}
String apply(String string) {
return string.replace(ch, toCh);
}
}
}